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EK-BA11A-TM-003

December 1983

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Document:	BA11-A Mounting Box and Power System Technical Manual
Order Number:	EK-BA11A-TM
Revision:	003
Pages:	106
Original Filename:

OCR Text

EK-BA11A-TM-003

BA11-A Mounting Box
and Power System
Technical Manudl

dlilgliltall

EK-BA11A-TM-003

BA11-A Mounting Box
and Power System
Technical Manual

1st Edition, December 1979
2nd Edition, March 1981

3rd Edition, August 1983

The information in this document is subject to change without notice and should not be

construed as a commitment by Digital Equipment Corporation. Digital Equipment
Corporation assumes no responsibility for any errors that may appear in this document.

Printed in U.S.A.

This document was set on DIGITAL’s DECset Integrated Publishing System.

The following are trademarks of Digital Equipment Corporation:

Eflaflnanm
DEC
DECmate
DECset
DECsystem-10
DECSYSTEM-20

DECUS
DECwriter
DIBOL
MASSBUS
PDP
P/OS
Professional
Rainbow

RSTS
RSX
UNIBUS
VAX
VMS
VT
Work Processor

CONTENTS
Page

CHAPTER 1

s 1-1
b
..ottt ettt s ettt
GENERAL.
1-1
tt
ot
PHYSICAL DESCRIPTION ..
1-2
tt
ot
H7140 POWER SUPPLY ..
1-2
iii
cooiiiii
L)....c.
(OPTIONA
H7750 BATTERY BACKUP UNIT
e e s e s s e 1-2
ereee e s smaas s s sirbtt
ot
ettt
RELATED DOCUMENTS ..

B
Lo b —

l.
1
]

INTRODUCTION

CHAPTER 2

INSTALLATION

CHAPTER 3

FUNCTIONAL OPERATION

[N I

SESES

2.4

UNPACKING AND INSPECTION. .. .ot 2-1
BA11-A Mounting Box Removal ... 2-1
201
BA11-A MOUNTING BOX INSTALLATION ..ot
2-1
tt
et
Power Connections (AC).....uvieiuiieeieeiieeerie
2-4
i
iiiiiiiie
AC Power Control Cabling.......c.oovoeeerieii
2-5
nenn,
eiiiieniiicenien
........c.ccocii
120 Vac to 240 Vac Power Supply Conversion
2-8
ot
OPTIONAL UNIT INSTALLATION ..
2o
.
.
872-D, -E Power Controiler Installation
2-8
ii
.cocooo
.......
ation..
H7750 Battery Backup Unit Install
..2-13
,
...
ENTS
OPTIONAL BACKPLANE MODULE ASSIGNM

2 2.1

2.2.2
2.2.3
2.3

2.3.1

o
—

o
)

W)
L
W

.
.

W
Lo

DDt
et et

2.3.2

3.2.2
3.2.2.1
3222

3.2.23
3.2.24
3.2.25
3.2.2.6
3.2.3
3.2.3.1
3.2.4
3.24.1
3.24.2
3.243
3.244
3.25

3.2.5.1

3.25.2
3.2.5.3

H7140 POWER SUPPLY FUNCTIONS ... 3-1
Signals and VOILAZES .....c.ovmeermriecueeiiieiiiiemeiemnssiseis et L3
Internal Signals and VOIAgES .......cccoouiiiiiiiinininiiiiiii 3-1
External Voltages and Signals ..........ccooooiimiminiins 3-2
POWER SUPPLY OPERATIONS ..ottt 3-3
INPUL ASSEIMDBLY ...ttt 3-8
s 3-8
s ettt eeieeeee
e ee eeiiiiet
Bias and INterface CIrCUILS......uviriiiiii
3-8
t
Bias VOIAZE ...ooveiieiieieceieee e
3-8
neeeaes
ettt
b
et
tt
DC Voltage Monitoring ........... et
3-8
tt
NOIMAl OPEIaAtiON.....eoveeeeeeeiiiiiiiiiiiiii et
3-12
rereeerennnes
e
Standby OPeration ..........ccccovviiiiniimiriienieen
Temperature SENSING .......cocviiirriiirieieiee e 3-12
Line Time Clock (LTC) Signal .......cooooiiiiiiiiiiiii 3-12
MEmMOTY VOIAZE. .. eieeieieeiieie ittt 3-12
t 3-12
es
ett
35 VG oot
3-15
o
Memory Voltage Regulators ..
3-15
cnc
e
iisiee
iiiiii
+5 B Regulator CirCUlt ......ooovii
+12 B Regulator CIrCUIt «..oociiiiiiiiiiriiii i 3-15
H7140-AA, -AB —12 B Regulator ClI‘CUIt ............................................ 3-18
H7140-DA, -DB —15 B Regulator Circuit........cccoovvrivieneencenieninninnn 3-18
Logic Voltage Generation ...........ccocooueieirieiniiinciiin it 3-20
e 3-22
+5 Voat 120 A LoZIC POWET ..ouveiiiiiiiiiiiicitieiceiceeiic
e 3-22
tt
—15 V LOZIC POWET ..ot
3-24
s
s
e
e
t
t
t
ses
e ee e t
1S V POWET oo
11l

CONTENTS (Cont)
Page
3.2.6
3.3
3.4

3.4.1

H7750 BATTERY BACKUP FUNCTIONS ..o, 3-24

Signals and VOItages .........co.oouiiiiiuiiiiiieeieeeeeee e 3-28
Battery Backup Operation............c..oveouieiiiiiieeneeee oo 3-28

CHAPTER 4

SERVICE

> B
R R RS s
b I I N R N R
[ ——— —
B R = —
W R —
—_

3.4.2

Fan Voltage Generation .............coocovoiuieeieeoeeie oo 3-24
872-D, -E POWER CONTROLLER FUNCTIONS .....oooiiioioeeeeoeeee) 3-24

POWER CHECKS ... e 4-1

4.2.2.1

4.2.2.2
4223

4.2.3
4.2.4
4.24.1

4.2.4.2

4.2.5

4.2.5.1
4.2.5.2
4.3

4.3.1

4.3.2

AC Power DiStribUtiON.......ccoouiiuiiiiiiecieceeceeeeeeee
e, 4-1
Initial AC Power Checks..........ccoooiiiiiiiiiie e, 4-1
DC Power Distribution. .......coceoiiiiiniiiiiccee

e 4-2
Initial DC Power CheckS........coouiiiiiiiiiiiiiieceeeeeeeeeeee
e 4-2
REMOVAL AND REPLACEMENT PROCEDURES ......cocoooeoioeeeeeeeee, 4-2
BA11-A Mounting Box in PDP-11/X44 or Similar Cabinet ...............c........... 4-2
Mounting Box Removal..............ocooooiiiiiiiiioeeeeeeeeeeeeeeeeeeee) 4-2
Interface Bracket Removal/Installation ...........ccooovveoeeeeeeoeeeeoeooea 4-12
Mounting Box Replacement ...........c..c.oooivviiiiiiiiiiieeee e 4-12
BA11-A Mounting Box on SHAes ..........cc.ocooviivioeioiieeeoeeeeeeeeeeeeeeeeeee, 4-14

BA11-A Slide Mounting Unit Removal............c.cocooovvvoiiveaeieieeie 4-14
Index Plate Installation ............coooieiiiiiiiioieioieeeeee e 4-18
BA11-A Slide Mounting Unit, Replacement .......................................... 4-19
Fan Assembly Removal and Replacement..............c.ccocooiveoenoooieeeeeee 4-19
H7140 Power Supply Unit.......coooiiiiiiiiiioe
oo, 4-21
Power Supply Unit Removal .............c..c.oooooiiiiiiceeee e 4-21
Power Supply Unit Replacement ................coooooeiiniivioieeeeeeeeeeeeeen 4-25
CPU Backplane AsSembIY ..........cooiiioiiviiiiiiiie
e, 4-26
Backplane Assembly Removal...............oooooveiiniiniieeeeeeeeeeeeeee, 4-26
Backplane Assembly Replacement .............c..coooouivoveveeoieeeeoeeeeeeeennn
. 4-27

POWER SUPPLY UNIT, COMPONENT LOCATIONS .....oooooiioeeeeeren 4-30
INput ASSEMDBLY ....c.ooiiiiiiiicee

e, 4-31
Power Distribution Module .............coooviiiiiiiiiiiiieeeeeeeeeeeeeeeeeeee
e, 4-3]

APPENDIX A

BA11-AS/AT USER INFORMATION

A.l

GENERAL.......oooee
et A-1
COVER AND DOOR REMOVAL .......cooviiimieeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee) A-1

APPENDIX B

877-B, -D POWER CONTROLLER REMOVAL AND REPLACEMENT

B.1

REMOVAL OF THE 877-B, -D POWER CONTROLLER............ccoovvevioeei, B-1
REPLACEMENT OF THE 877-B, -D POWER CONTROLLER ........cccocoov...... B-1
877-B, -D POWER CONTROLLER FUNCTIONS ......ootrootmieoeeeeeeeeeeeeeeeenen, B-5

B.2
B.3

B.4
B.4.1

B.4.2

POWER CHECKS ..ottt

e, B-5
AC Power DIStriDULION ....ocovviiiiiiiiicccecieeeee e, B-5
DC Power DIStriDUtiON.......c.ccueeiiiiiiiieiceeicceeeeee e, B-6

FIGURES

S
— O

]

Ahhb&b-&-{:-hwwwwww

)

]

)

LA)L»)L)JL»JWL»JNI\)I\)I'\)NK)I\)NNN'—“'—‘H
o=
—
A th by
— L oo USdh B

Figure No.

4-10
4-11

4-12

4-13
4-14

4-15
4-16
4-17

4-18
4-19

4-20

4-21

Title

Page

e e e e e e e e e e e e 1-1
BATI-A DIMENSIONS ..eviviiiiiiiiiiiiiieii ettt
e 1-2
Mounting Box in HI61 Cabinet.........ccoooiiiiiiiiiiiiiiiiiiiiie
Mounting Box in System Cabinet ............ccocceioiiiiiiii 1-3
e e 2-2
BA11-A Mounting Box Packaging..........ccccceemmininiins e
Mounting Box, Rear Panel Components............ccooooiiie —— 2-3
e 2-4
BA11-AA -AB AC Connector SpecifiCations........ccoovvuemiiiierieniiiiiiiicieee
872-D, -E Power Controller Unit AC Connector Specifications............cccccceevieennne. 2-5
Typical Power Control Cabling..........ccoooviiiiiiiiiiiii

s 2-6

H7140 Unit, AC Power Cord Assembly REMOVAL oo 2-7
872-D, -E Power Controller Front Panel Locations .........ccccocooiieiniiiininiiiins 2-9.
s 2-10
e sieieiieeiaaararrrerreeeaen
iiiiiireieeeeee
e eneee
H7750 Unit, Cable CONNECLIONS ......viveiiiii
e 2-11
H7140 Unit, +300 Vdc Test LoCation ........ccoveiiiiiiiiieeeiiiiiiieeeeeciiiiieec
enee 2-13
e
Optional Backplane Connector ASSIGNMENTS.........ccuiiiiiiiieiiiniiiiieie
Power Supply, External Signals and Volages ... 3-2
H7140-AA, -DA, -AB, -DB Power Supply Interconnection............ccccccoeoiiiiiinnnen. 3-4
Power Supply Functional Block Diagram ... 3-7
Bias and Interface Circuits, Block Diagram ...........cccoeeiiiiiiiiiiiiiiiieeeee 3-9
Memory Voltage Generation Functional Block Diagram ..., 3-13
+5 B Voltage Regulator, Circuit Block Diagram ... 3-16
+12 B Voltage Regulator, Block Diagram..............coooi 3-17
—12 B, —15 B Regulator, Block Diagram ..........ccccociii 3-19
Logic Module Voltage Generation, Functional Diagram................... 3-21
—15 V Power, Functional Diagram...........cccoueiiiiiiiiiii 3-23
a e e e eas 3-25
eee e
+15 V Power, Functional Diagram........................ e
Fan Voltage Generation, Functional Diagram .......c..ccccooiiiiiinn 3-26
872-D, -E Unit, Simplified Diagram.......ccocccoooiiiiiiiiiiiiii 3-26
H7750 Unit, Simplified Diag@ram.........ccccccoimiiiiiiiiiiiiiec
i 3-27
e 4-3
Backplane Assembly, Pin Designations...........ccccocoiiiiiiiiiiiiiiiiii
Cabinet Type IdentifiCation.........oocveiiieiiiiiiiii i 4-5
Mounting Box Release Lever, System Cabinet........cccccoooiiiiiii 4-6
e 4-6
Top Cover Mounting (TYPE A) ..eeeiiiiiiiiiiiieie
e 4-7
Top Cover Mounting (Type B) ...ooooiiiriiiii
BA11-A Unit Cable Clamps .....ccooooiiiiiiiiieeee i 4-8
BA11-A Type B Box Slide Latch Locations............ccoovriiiiiiiiii 4-9
System Cabinet Safety Lever.......oooviiiiii 4-10
System Cabinet, Mounting Box Hardware ... 4-11
e 4-12
Interface Bracket MOUNTING .....oooiviiiiiiii
Mounting Box Release Lever Slide Mounted Unit..........c.ooooii 4-15
SHAe HOI LEVETS ..ot 4-16
et 4-17
Slide to Index Plate MOUNTINE ...oocvviiieiiiiieee
Index Plate MOUNTINE .......vviiiiiiiieee e 4-18
Fan Assembly Removal..........ooooiii 4-20
Power Supply Unit, Rear Mounting SCrews ...........ccccoooiiiiriniiniinininenen, s 4-22
Power Supply Unit Removal ..., 4-22
Mounting Box, Power Cable Connections............ccooviiiiiiiiiiiiiiiie i 4-23
Power Distribution Panel Connectors and Cable Assembly ..., 4-24
CPU Backplane Assembly MOUNEINE.......ccoiiiiiiiiiiiiiiiie e, 4-28
Backplane Assembly AZNMENt.......oooiiiiiiiiiiiii 4-29

FIGURES (Cont)
Figure No.

Title

Page

H7140 Unit Module and Assembly Locations...........cccccveiiiiniiiiiieiinnnieecens 4-30
Input Assembly, Component Locations ............ccccoiviiiiiiiiiiiiiiniiiiciiee
e, 4-31
Power Distribution Module COmMPONENLS .......cccuvveereieiiirieianiieee e 4-31
Power Distribution Cable Assembly Wiring............cocooioiiiiiiiiin 4-32
Mounting Box in System Cabinet .........c.cccoevieiriiieniiiniieiiiiii A-3
System Cabinet with Internal Components (Front View)..........c.cccoonninininennn, A-4
System Cabinet with Internal Components (Rear View)..........c.occociiiiiiiiinn, A-5
BA11 Mounting Box Top COVer .....cccoiiiiiiiiiiiiiieciee
e A-6
BA11 Cable Routing and Clamps...........coieeiiiiiiiieiiiiiiecerecececccnin
e A-7
Mounting Box Power Cable Connections...........cccococviiiiiiiiiiiiiiiiiiceiene A-8
877-B, -D Power Controller Mounting Arrangement ..........cccceeeeevvniiiiieereeneeninninnnnnns B-2
877-B, -D Power Controller (Front VIew)........cccoviiiiiiiiiiiiiicceceeeeeeine B-3
877-B, -D Power Controller (Rear VIEW).......cccoouiiiiiieriiiiieeiceeecece
i, B-4
877-B, -D Unit, Simplified Diagram...........ccccoeeeemiiiiiiinniini
e B-5

TABLES

O
[}
DD bt

P R SR P R S
L}
1
[}
]
D DO et b

1
o

e
1
1
WD BN

]

Title

Page

H7140-AA, -AB Power Supply Specifications ............cccooviiiiiiiiiiiie, 1-4
H7140-AA, -AB Output Specifications ...........cccccoeeiiiiiiiiiiiii
i, 1-6
H7140-DA, -DB Output Specifications..........cccoeoveeriiriieioiiniiiiceie
e 1-7
Related PubliCAtiONS .......ccuvvviiiiiiiee et
e 1-8
Input Power Cable ASSEmDbIY ........cccoviiiiiiiii 2-5
Control Panel Signals ............oooooiriiiiiiiieeie e 3-1
Backplane Signals ...........coccviiiiiiiiiiiiiiiece
e 3-3
Power Controller SIZNals ............coooiviviiriieeeiiiie
e
3-3
-AA, -AB CPU Backplane Connector P1, Signals and Voltages................ccoeei 4-4
-DA, -DB CPU Backplane Connector P1, Signals and Voltages............................. 4-4

PREFACE

This manual describes the BA11-A mounting box, its power system, and the optional battery backup unit.
The BA11-A is used to house the PDP-11/44 and other PDP-11 processors. VAX-11 specific
information is contained in Appendix A and B.

vil

CHAPTER
1

INTRODUCTION

1.1
GENERAL
This manual describes the BA11-A mounting box, its power system, and the optional battery backup unit
ALLA

LAl

Ldilk.

The BA11-A is used to house the PDP-11/44 and other PDP-11 processors. VAX-11 specific information
is contained in Appendix A and B.
1.2

PHYSICAL DESCRIPTION

The BA11-A mounting box is shown in (Figure 1-1). It contains the H7140 power supply, the specified
systems backplane {the PDP-11/44 backplane), and three cooling fans for the mounting space and power supply. The BA11-A also has space for mounting optional backplanes such as the DD11-CK and
DDI11-DK. The BA11-A may be mounted in a slide mount installation (Figure 1-2) or a cabinet system

(Figure 1-3).

66.01 CM

26.34 CM
(10.37 IN)

26.34 CM

{10.37 IN}

AN
46.99 CM

(18.5 IN)

TK-3479

Figure 1-1

BAI11l-A Dimensions

1-1

l
o0 o

6
&

60 06

0B85
00

O 66 00

66
6

D @66 O o

6 6

‘7}‘_;‘
&6
H S
&
o
[

1
NOTE:

SLIDE AND SLIDE INDEX PLATE

ARE USED WITH RACK MOUNTED VERSION.
TK-4183

Figure 1-2
1.3

Mounting Box in H961 Cabinet

H7140 POWER SUPPLY

The H7140 power supply is used in the BA11-A. Table 1-1 lists the H7140-AA, -AB input specifications.
Table 1-2 lists the H7140-AA, -AB output specifications. Table 1-3 lists the H7140-DA, -DB output
specifications.

1.4

H7750 BATTERY BACKUP UNIT (OPTIONAL)

The H7750 battery backup unit provides dc refresh power to MOS memory and keeps the cooling fans
operating in the event of an ac power failure.

The unit contains three sealed, 12 Vdc, lead acid batteries that supply 36 Vdc to the memory regulators
in the H7140 and the cooling fans.

1.5

RELATED DOCUMENTS

Table 1-4 lists manuals and publications that contain information related to the installation and operation
of the BA11-A mounting box.

Wi,

Wiy,
muw,,

[
iy

TK-3631

Figure 1-3

Mounting Box in System Cabinet

1-3

Table 1-1

Characteristics

H7140-AA, -AB Power Supply Specifications

Description

H7140-AA Power Supply
Line voltage

90 Vrms — 128 Vrms, single phase, two wire and ground (120 Vrms nomi-

nal)
Frequency

Current (ac)

47-63 Hz

15 A rms max. at 120 Vac

55 A peak max. at 120 Vac

Power factor

Greater than 0.60 at full output load and low input voltage (90 V)

Inrush current

65 A peak at 128 Vrms for one-half cycle, followed by repetitive peaks of
decreasing amplitude for an additional 8 cycles of the input voltage

Power

1350 W with maximum load applied at nominal voltage output

Overvoltage

condition

Can withstand input overvoltage of 150 Vrms for one second

Noise transient

(Maximum acceptable)
Low energy
transients

300 V peak voltage spike* containing not more than 0.2 watt-seconds of

energy per spike
High energy

transients

1 KV peak voltage spike* containing not more than 2.5 watt-seconds of

energy per spike

Conducted noise

CW-10 KHz to 30 MHz, 3 Vrms

Radiated noise

RF field strength — 10 KHz to 30 MHz, 1 V/M 30 MHz to 1 GHz: 10
V/M

H7140-AB Power Supply
Line voltage

180 Vrms — 256 Vrms, single phase, two wire and ground (240 Vrms nominal)

Frequency

47-63 Hz

1-4

Table 1-1

Characteristics

Current (ac)

H7140-AA, -AB Power Supply Specifications (Cont)

Description

9.0 A rms max. at 240 Vac

33 A peak max. at 240 Vac

Power factor
Inrush current

Greater than 0.60 at full output load and low input voltage (180 V)
130 A peak at 256 Vrms for one-half cycle, followed by repetitive peaks

of decreasing amplitude for an additional 8 cycles of the input voltage
Power

1350 W with maximum load applied at nominal voltage output

Overvoltage
condition

Input overvoltage of 300 Vrms for ore second (maximum)

Noise transient
(Maximum acceptable)
Low energy
transients

300 V (peak voitage spikeTM containing a maximum of 0.2 wati-seconds of
energy per spike)

High energy
transients

1 KV (peak voltage spike* containing a maximum of 2.5 watt-seconds of

energy per spike)

Conducted noise

CW-10 KHz to 300 MHz, 3 Vrms

Radiated noise

RF field strength — 10 KHz to 30

MHz, 1 V/M 30 MHz to 1 GHz: 10 V/M
*A spike is a voltage transient of either polarity and of either common or differential mode, with a rise time (10% to 907%) of
0.1 us or less, and a fall time (to 10%) of 10 us or more. The average power of spikes should not exceed 0.5 W.

Table 1-2

H7140-AA, -AB Output Specifications
Nominal OQutput Voltages
Memory Voltages

Logic Voltages

Parameter

+5.1V

+15.0V

-15.0V

+12.0V

-12.0V

+5.1V

Minimum
Maximum

6.0 A

0.0 A

0.0A

0.0 A

120.0 A

3.0A

SOA

1.0 A

Static Load/Line

+0.10V

+0.30V

+0.30 V

+0.24 V

10.0 A
+0.10 V

Output Current

9-1

Regulation

Ripple Voltage

100 MV, P-P

+300 MV, P-P

+240 MV, P-P

+100 MV, P-P

Noise Voltage

+51 MV, P-P

150 MV, P-P

120 MV, P-P

51 MV, P-P

Dynamic Regulation

18 A

0.5 A

*1.0A

+0.25 A

2.0 A

Over/Undershoot

100 MV

300 MV

240 MV

100 MV

Current Limit

125to 140 A

3.2t04.0 A

5.5t06.5 A

1.8t0 3.0 A

10.5to 13.5 A

+6.5V

18.0V

+15.0V

-15.0V

+6.5V

+7.0V

+21.0V

+16.0V

-16.0V

+7.0V

Initiation Point

Overvoltage Limit
Maximum Trip Point
Maximum Voltage

Table 1-3

H7140-DA, -DB Output Specifications
Nominal Qutput Voltages
Memory Voltages

Logic Voltages

Parameter

+5.1V

+15.0V

-150V

+12.0V

—15.0V

+5.1V

6.0 A
120.0 A

0.0 A
3.0 A

0.0 A
5.0A

0.0 A
1.0 A

0.0 A
10.0 A

+100 MV, P-P
51 MV, P-P
+18 A
100 MV
125 to 140 A

+300 MV, P-P
+150 MV, P-P
+0.5 A
300 MV
3.2to 4.0 A

240 MV, P-P
+120 MV, P-P
+1.0 A
240 MV
55t06.5 A

+300 MYV, P-P
+150 MV, P-P
+0.25 A
300 MV
1.8t03.0 A

+100 MV, P-P
+51 MV, P-P
+2.0 A
100 MV
10.5t0 13.5 A

+6.5V

18.0V

+15.0V

18.0V

+6.5V

+7.0V

+21.0V

+16.0 V

210V

+7.0V

Output Current

Minimum
Maximum

Static Load/Line

+0.10V

+0.30V

+0.24 V

+0.10 V

L-1

Regulation

Ripple Voltage
Noise Voltage
Dynamic Regulation
Over/Undershoot
Current Limit
Initiation Point

Overvoltage Limit
Maximum Trip Point

Maximum Voltage

Table 1-4

Related Publications

Title

Document Number

PDP-11/44 System Technical Manual

EK-KD11Z-TM

PDP-11 Peripherals Handbook

EB-07667-20/78

PDP-11 Processor Handbook

’.

EB-17716-18/79

BAT11-A Box Assembly Field
Maintenance Print Set

MP-00832

11/44 System Field Maintenance
Print Set

MP-00809

872 Power Controller Field
Maintenance Print Set

MP-00865

BA11-A Unit Assembly (IPB*)

EK-BAI1A-IP

H7140 Power Supply (IPB¥*)

EK-H7140-1P

*[llustrated Parts Breakdown

1-8

CHAPTER 2

INSTALLATION

2.1 UNPACKING AND INSPECTION
The BA11-A mounting box is packaged and shipped in reinforced cartons and protected internally by

foam inserts and a polyethelene bag. Before unpacking any carton, remove the packing list from the
container.
NOTE
Retain the packing material and shipping containers
in the event reshipping is required.

2.1.1

BA11-A Mounting Box Removal

The BA11-A mounting box is packaged in reinforced cartons and protected by foam inserts and a
polyethelene bag as shown in Figure 2-1. To remove the unit from the container, perform the following
procedure.
CAUTION
The BA11-A unit weighs approximately 34 kg (75
Ibs). Use care when lifting the unit from the carton.

NSV
w

Open the leaves of the outer carton by cutting the tapes at the seams.

2.2

Remove the inner carton from the foam protector.

Open the leaves of the inner carton by cutting the tape at the seams.
Remove the side and rear protectors.

Remove the unit from the polyethelene bag.

Remove the bezel protector.
Inspect the unit for visible damage and ensure that the contents are complete.

BA11-A MOUNTING BOX INSTALLATION

The BA11-A mounting box may be installed in a system cabinet like the one used in the PDP-11X44,
or the mounting box may be mounted on slides in a 48.26 cm (19 in) cabinet. For instructions on the
installation of the BA11-A mounting box refer to Paragraph 4.2 of this manual.

2.2.1

Power Connections (AC)

The BA11-AA, -AB mounting boxes are supplied with a 2.74 m (9 ft) line cord attached to the rear of
the unit. Figure 2-2 shows the ac line cord, circuit breaker, and connectors. The line cord plug may be
connected to an 872-D, -E power controller unit (or equivalent) or directly to the ac power receptacle at
the site.

2-1

SIDE PROTECTOR

REAR PROTECTOR

BA11-A UNIT

BEZEL PROTECTOR

INNER BOX

/—OUTER BOX

FOAM PROTECTOR

TK-3529

Figure 2-1

BAI11-A Mounting Box Packaging

—

o0
L

I | I

p !

| B

18]

0o oo

e
| S

10 —![‘
|

—

mor i

I | N

eXe)

ST
I

[

@®

wmam

J
AC POWER

@®

® \

o
®

[ =

1201220 vac ~ CB!
CIRCUIT

SWITCH

TERMINAL COVER

BREAKER
AC

—

LINE CORD

——
TK-4389

Figure 2-2

Mounting Box, Rear Panel Components

2-3

The 872-D, -E power controller, used in systems such as the PDP-11X44, allows the key switch on the
control panel to apply and remove ac power from all units connected to the switched outputs of the

power controller. In addition, the power control bus, used to control the ac power internally, can be
routed externally to switch ac power from any other power control unit.
Figure 2-3 shows the type of connector plugs and receptacles used, and the DIGITAL part numbers

for the connectors. The color of the cable wires connected to the plug is also indicated. The NEMA 520 P plug is attached to the BA11-AA cable. The NEMA 5-20 R and 6-15 R are dual-receptacle outlets
that can be installed within a wall outlet box or a power distribution unit.

PIN SIDE

PIN SIDE
GROUND

GROUND

GRN/YEL

(GRN/YEL)
NEUTRAL

NEUTRAL

pHasg

(BLUE)

240V, 15A
MALE PLUG

125V 20A
MALE PLUG

PDP—11/44—CB

PDP—11/44—CA

NEMA *

DESIGNATION

5-20°
5-20 R
6-15P

6—15 R
* P =
R =

oHASE

(BLUE)

POWER

RATING

DIGITAL PART NO.

125V 204
’

12-15183-00
12-12265-00 * *

240V, 154

90—08853—00

12-11204-01 * *

PLUG
RECEPTACLE

DUAL RECEPTACLE OUTLET
TK-4390

Figure 2-3

BA11-AA, -AB AC Connector Specifications

The 872-D, -E power controller is supplied with a 4.57 m (15 ft) cord and plug that connects to a
receptacle at the site. Figure 2-4 shows the cord connector configurations and the DIGITAL part

numbers for the plugs and receptacles.

2.2.2 AC Power Control Cabling
Figure 2-5 shows a typical cabling configuration that enables control of the ac power from the control

panel keyswitch on the BA11-A CPU unit. The power control bus cabling also contains an overtemperature line which will remove the ac power from the units connected to the switched receptacles
of the 872-D, -E unit when the internal temperature of a unit exceeds a specified level.

2-4

PHASE OR

PLUG (MALE)

NEUTRAL

(NEUTRAL

GREEN
—AnTH

PREFERRED)

_\fgl
G

PHASE OR

BLACK

NEUTRAL

GROUND

\ NEMALG6-20R

NEMA [6-20P

230 V USED WITH THE 872—E

RECEPTACLE (FEMALE)

EARTH \'(} L]

GROUND

4
\

WHITE

WHITE W

PHASE

BLACK _ \ % , G

NEUTRAL

GREEN G [

PLUG (MALE)

— X

NEMA L5-30R

/
\

GREEN

NEMA L5-30P

115V USED WITH THE 872-D

CONNECTOR SPECIFICATIONS
MODEL

PLUG

RECEPTACLE (SUPPLIED BY CUSTOMER)

NUMBER

POWER

RATING

NEMA CODE

DEC PART NO.

872-D

115 V

30 A

L5-30P

L5-30R

12-11194

872—E

230 V

20 A

L6-20P

L6-20R

12-11191

TK-4391

Figure 2-4

872-D, -E Power Controller Unit AC Connector

Specifications

2.2.3

120 Vac to 240 Vac Power Supply Conversion

The H7140 power supply can be converted to operate with either 120 Vac input power or with 240 Vac
input power. The conversion requires the replacement of the input power cable assembly. This assem-

bly consists of the line cord, connector cover, and plastic bezel. Table 2-1 lists the DIGITAL part
number for each assembly.

Table 2-1

Part No.

Input Power Cable Assembly

Input Power

Power Supply Designation

7016478-00

120 Vac

H7140-AA

7016478-01

240 Vac

H7140-AB

2-5

PDP-1IX44 CABINET OR PDP-il/44
RACK
CABINET

BA11-AA, -AB MOUNTING BOX

POWER

CONTROL

)

AC POWER

872-D, -E POWER CONTROLLER

NONSWITCHED
RECEPTACLES

SWITCHED

RECEPTACLES

POWER

J1
o

MR-

L/ CORD ASSEMBLY

CABLE NO.

7008288

1 C:) POWER CORD

RECEPTACLE

12
|

%
7

4
7

n
Z
%

g L w POWER CONTROL
BUS TO OTHER

SYSTEM UNITS

H7750-AA, BATTERY BACKUP

B.-AC, -AD

CABLE NO.
7008288

%/
7
|

J11

TK-5637

Figure 2-5

Typical Power Control Cabling

To convert the power supply from one voltage to another, perform the following procedure.
1.

Remove the ac power cord connector of the power supply from the power controller recep-

tacle or wali receptacie.

Remove the cable clamps or fasteners used to secure the power cord to the cabinet frame.
Remove and retain the 8-32 (1) screw in the connector cover and the two 8-32 screws and

washers (2} and (3) shown on Figure 2-6.

Slide the cable assembly away from the supply so that the three 10-32 nuts that secure the
line cord leads to the filter assembly are accessible.

Remove the nuts using a 3/8 inch nut driver and remove the line cord assembiy.

Change the position of the 120 V/240 V slide switch S1 to the position that corresponds to
the voltage of the replacement line cord assembly. When the switch is in the up position, 120
Vac is selected, and when in the down position, 240 Vac is selected.
Secure the replacement line cord assembly to the cabinet frame using the hardware removed
in steps 3 and 5.

NOTE

The plastic bezel holds switch S1 in the position corresponding to the voltage of the mounted line cord
assembly.

®le

;Q)

L]
@@—

Lo P e

BLUE

GRN/YEL

[C)]

;fl(a

SLIDE SWITCH

BRN

LINE CORD
TK-3658

Figure 2-6

H7140 Unit, AC Power Cord Assembly Removal

2-7

2.3

OPTIONAL UNIT INSTALLATION

2.3.1

872-D, -E Power Controller Installation
The 872-D, -E power controller may be used with the BA11-A mounting box. To install a unit into a

standard cabinet or rack, perform the following procedures.
1.

Mount the 872-D, -E unit onto the cabinet rails using the hardware supplied with the unit.

NOTE
The power controller can be mounted at the front or
rear of the cabinet.

Connect the ac line cords from the units within the cabinet to the appropriate ac power
receptacles (switched or unswitched) on the power controller. The BA11-A CPU (PDP11/44) must be connected to an unswitched receptacle in the power controller unit.

Route the ac power cords away from the signal cables and secure the cords with cable
clamps or tie wraps.
Attach connector P1 of cable assembly (DIGITAL no. 7008288) to connector J3 or J4 located at the rear of the H7140 power supply (Figure 2-2).

Attach connector P2 of the cable assembly to connector J11 or J12 of the power controller

unit (Figure 2-7).

Set the LOCAL/OFF/REMOTE switch of the power controller unit to the REMOTE posi-

tion.

Connect the ac power cord of the 872-D, -E power controller to the main power receptacle

at the site.

Set the circuit breaker of the power controller to the ON position (up).

2.3.2

H7750 Battery Backup Unit Installation
The H7750 battery backup unit may be installed in a system cabinet or in any standard 48.2 cm
(19 in)
mounting rack. For example, in the PDP-11X44 system cabinet, the H7750 unit
is mounted on the
vertical cabinet rails at the lower front of the cabinet. The battery backup cable assembly
(DIGITAL
No. 1700177) connects from the rear of the H7750 to the H7140 power supply in the
mounting box. To
connect the unit, perform the following procedures.

In a PDP-11X44 system cabinet or similar installation, perform steps 1, 2, and
of Paragraph 4.2.1.1.

through 11

In installing the H7750 into a 48.2 cm (19 in) cabinet where the mounting box is attached
to
slides, perform steps 1, 2, and 5 through 9 of Paragraph 4.2.2.1.
Mount the H7750 unit to the cabinet rails using the hardware supplied with
the unit. Make
certain the toggle switch on the front panel of the H7750 unit is in the OFF position.

,
*

)

]

J1 412
N

=]| CONTROLLER
@l

AL,

CIRCUIT

BREAKER

| POWER

J
[

alet @

[

TK5011

LOCAL/OFF/REMOTE
SWITCH
AC

INDICATOR

Figure 2-7

872-D, -E Power Controller Front Panel Locations

At the rear of the H7750 unit, attach connector P3 of the cable assembly 1700177-0 to J9 and
connector P2 to J8 (Figure 2-8).
Connect the ac power cord plug of the H7750 unit to an unswitched receptacle of the power
controller.

Route the cable assembly through the rear of the cabinet and up to the rear of the mounting
box. Allow enough cable slack to prevent tension on the cable or cable connectors.
CAUTION
The H7140 power supply contains dangerous voltage
and high current capabilities. Allow five minutes after the ac power is removed from the supply to ensure
proper discharge of the power supply currents.

Remove and retain the three (8-32) screws that secure the top cover of the H7140 power

supply. These screws are located in the depressions on the top cover (Figure 2-8).

Loosen the two (8-32) screws that secure the end of the top cover to the power supply. Do
not remove the screws.

Slide the cover assembly away from the screws loosened in step 8.
10.

Using a multimeter set to the 300 Vdc range, measure the voltage across pins | and 2 of TB1
as shown on Figure 2-9. The voltage should be less than 20 V after the 5 minute interval.

11.

Remove the bias and interface module (Figure 2-8) by sliding the module up.

SCREWS

TOP COVER

c/l

(8-32)
3 PLACES

SCREWS

(8-32)
2 PLACES

>«,

BIAS AND

INTERFACE

MODULE

)

QQ[::E:J

SSS
~

‘/‘

i a

)

(

1
y

’a

|
MOTHER

\;/

H7140

POWER

¥ SUPPLY UNIT

Ny
J3
Y

‘Ii4

CABLE ASSEMBLY
NO. 1700177-0

)

872-D, ‘E
POWER

CONTROLLER

UNIT

47750 BATTERY |
BACKUP UNIT
!

CABLE ASSEMBLY

NO. 7008288

$) 872-D-E POWER
CONTROLLER

UNIT

TK-5009

Figure 2-8

H7750 Unit, Cable Connections

2-10

TOP VIEW

~BROWN
i

'\v«/

\
TB1
REAR

+RED LEAD

TK-5010

Figure 2-9

12.

H7140 Unit, +300 Vdc Test Location

Attach connector P1 of the cable assembly to J9 on the mother module of the power supply.
The black leads of the cable assembly should be positioned toward the front of the mounting
box. The notches in the connectors will interlock when the connectors are properly positioned.
NOTE

When attaching P1 to J9, make sure all the pins of
J9 are inserted into P1. If all the pins of J9 are not
inserted into P1, the battery backup unit and power
supply will be damaged.

13.

Dress the cable up and over the depression in the rear panel of the power supply.

14.

Replace the bias and interface module that was removed in step 11. Ensure that the connector on the bottom of the module mates correctly with the pins that project upward from
the surface of the mother module.

2-11

Replace the top cover of the power supply that was removed in steps 7 through 9.
NOTE
Several leads of the power suppply are routed close
to the top cover. When replacing the cover, ensure
that none of the leads will be punched or pierced
when the cover is mounted.

16.

In the PDP-11X44 or similar cabinet, perform steps 16 through 20 of Paragraph 4.2.1.3 to
replace the top cover assembly.

17.

If an overtemperature control of the output of the H7750 is desired, install the cable assembly (DIGITAL No. 7008288). Connect P1 of the cable assembly to connector J3 or J4 at the
rear of the H7140 power supply. Connect P2 of the cable assembly to connector J10 or J11
of the H7750 battery backup unit (Figure 2-8).

18.

Position the cables previously installed away from sharp objects and insure that no cable
strain exists when the mounting box is extended to its maintenance position.

19.

Secure the cables to the cabinet rails, or sections, using the existing cable clamps or other
cable fasteners.

20.

Apply ac power to the 872-D, -E power controller unit by setting the circuit breaker to the
ON (1) position (Figure 2-7).

21.

Ensure that the ac circuit breaker at the rear of the BA11-A mounting box is in the ON (1)
position.

22.

Set the toggle switch on the front of the H7750 battery backup unit to the ON (1) position.

23.

Ensure that the rotary key switch on the control panel is in the LOC, LOC DSBL or STD

BY position.

24,

Ensure that the DC ON and BATT indicators of the control panel are lighted. The BATT
indicator is on continuously if the batteries are fully charged, or the indicator flashes slowly
if the batteries are charging (less than 90 percent of full charge).

25.

Verify that the battery backup unit is functioning by performing the following steps.
a.

Deposit a BRANCH SELF instruction (777g) at location 200g.

Load address 200g and start the CPU.

Disconnect the BA11-A ac power cord from the receptacle. The BATT indicator light
will blink fast.
NOTE
The keyswitch should not be turned to the DC OFF

postion when performing this test. This would remove
all power from memory and destroy its contents.

Reconnect the BA11-A ac power cord to the receptacle.

Srnasanh

Examine location 200g. Its contents should be 777g, the BRANCH SELF instruction, if
the batiery backup unit is functioning properly.

2.4 OPTIONAL BACKPLANE MODULE ASSIGNMENTS
The BA11-A mounting box may contain optional backplane assemblies in addition to the basic CPU
backplane (PDP 11/44) installed in the unit.

The slot locations of the optional backplanes are divided into three categories: standard UNIBUS,
modified UNIBUS, and small peripheral control (SPC). Particular areas of the backplane are reserved
for the different types of modules as shown in Figure 2-10.

The DD11-CK and DD11-DK are general purpose backplanes. The DD11-DK backplane is limited to 32
amps. The standard UNIBUS locations contain all the UNIBUS connections. Rows A and B of slot 1 are
the beginning of the UNIBUS in the DD11-CK backplanes and DD11-DK, and should be occupied by the
BC11-A UNIBUS cable or a M9202 UNIBUS connector. Sections A and B of slot 9 in the DD11-DK
backplane, or of slot 4 in the DD11-CK backplane, are the end of the UNIBUS on the backplane. These
sections should be occupied by the BC11-A UNIBUS cable, M9202 UNIBUS connector, or an M9202
terminator module.
Other dedicated backplanes, such as the RH11, DH11, RK22, or RK6/711, are available as options.
The UNIBUS inputs and outputs and terminator usage are the same as described for the general
purpose backplanes, however, the module types and their locations are dedicated in these backplanes.

DD11--CK BACKPLANE
ROW

NENSN

S
2

{

‘

<
\

F—HEIGHT

‘

MODULE

QUAD OR HEX HEIGHT

o
N

\-Q

— QUAD HEIGHT MODULE

STANMADT

SLOTS

UNIRLS

zize

SLOTS

FOR

MODIFIED

PERIPHERA!

CONTROLLER

ISPC, SLOTS

UNIBUS DEVICES iMUD:

Figure 2-10

QUAD

‘

91\

MODULE

MODULES

QUAD

—HEIGHT

/r
]

QUAD
OR HEX

QUAD HEIGHT

MODULE

o3l

DD11-DK cow
BACKPLANE

L RSN NN

Optional Backplane Connector Assignments

HEIGHT

ODULE

MODU

CHAPTER 3

FUNCTIONAL OPERATION

This chapter describes the functional operation of the H7140 power supply, the 872 power controller unit,
and the H7750 battery backup unit. Refer to the appropriate manuals listed in Table 1-4. The field
maintenance print sets, also listed in Table 1-4, contain the assembly drawing related to these units and the
circuit schematics (CS) referenced in this chapter.
3.1 H7140 POWER SUPPLY FUNCTIONS
the H7140-AA, -DA (120 Vac) and the H7140-AB, -DB (240 Vac) units are high-frequency-switching
power supplies that provide the dc voltages for the logic modules and memory modules installed in the
BA11-A mounting box. The power supply also generates the square wave voltage used to power the fans
within the fan assembly. Therefore, it is not necessary to change fans when converting from 120 Vac to
240 Vac operation.
3.1.1

Signals and Voltages

Figure 3-1 shows the signals and voltages that are transferred between the power supply and the assemblies and units within the BA11-A mounting box and between the power supply and external units. The
872-D, -E power controller unit is included with the PDP-11/X44 or similar system. The H7750 battery
backup unit is optional with the PDP-11/44 or other PDP-11 systems mounted in the BA11-A mounting
box.

3.1.1.1 Internal Signals and Voltages — Three signals are transferred between the control panel and
the power supply. Table 3-1 lists the signals and their functions.

Table 3-1

Control Panel Signals

Signal

Function

DC ON (L)

From the control panel keyswitch S1-B. Set to ground when the positions LOCAL and LOC DSBL are selected. Enables all the dc voltage outputs of the
power supply.

STANDBY (L)

From the central panel keyswitch S1-B. Set to ground when position STDBY is
selected and disables the logic module dc voltage outputs (+5V, +15V, —15
V). Fan and memory voltage outputs (+5 B, +12 B, —12 B) remain enabled.

BATT MON

From the power supply. Controls the BATT indicator on the control panel when

the H7750 battery backup unit is included in the system.

3-1

BAII-AA,-AB MOUNTING BOX
H7140 -AA, -AB

DC ON (L)

CONTROL
PANEL

POWPETK

SUPPL

STD BY (L)

BATT MON

AC LO
DC LO

LTC

POWER REQUEST

CPU
AND

BOOT ENABLE *

EXPANDER

BACKPLANES

+5.1V @120A

POWER
<
INPUT 120/240V1cONTROLLER|
POWER 53760
o ]872-D.E

POWER REQUEST

SWITCHEDAC |

LOGIC

| vOLTAGES

+15.0V @3A

-15.0V @ 3A

12.0V

DC ON (L)
UNSWITCHED AC

H120vE5

SHUTDOWN (L)

MEMORY

_120V@ 1A

VOLTAGES
+5.1V @10A

BATTERY

toBATT

H7750.AA,

| CHG MODE

-AB, -AC,
AD

>
.

BACK-UP

UNIT

MONIT ENAB

BATT MON

FAN
ASSEMBLY

3BV MM

MEM DC LO

FAN BUS

+5VB

NOT SUPPLIED
TO EXPANDER BACKPLANE
TK-3493

Figure 3-1

Power Supply, External Signals and Voltages

In addition to the output voltages from the power supply, several signals are transferred
between the
power supply and the CPU and expander backplanes. Table 3-2 lists the signals and their functions.
3.1.1.2 External Voltages and Signals - The 872-D, -E power controller distributes and
controls the ac
input voltage to the power supply and other units. The power controller contains a circuit
breaker that

can remove all power from the switched and unswitched power receptacles. Control
signals from the

power supply can also remove the ac power from the switched receptacles. Table 3-3

]

(o2

signals and their functions.

lists the control

3.2

POWER SUPPLY OPERATIONS

Figure 3-2 shows the interconnections of the circuits and modules within the H7140-AA, -AB, -DA, -DB
power supply. The input voltage is selected by switch S1 which is located at the rear of the power supply.
The ac voltage is received by the input assembly which performs the function of a voltage doubler when
the 120 Vac input is selected, and of a full wave rectifier when the 240 Vac input is selected. The dc
outputs of the input assembly provide the voltage to the memory inverter module, to the logic inverter
module, and to the bias and interface module via the mother module. The bias and interface module
generates the bias voltages required by the regulators, the voltage generator circuits, and the fans. Figure
3-3 is a functional block diagram of the power supply.

Table 3-2

Backplane Signals

Signal

Function

AC LO

From the power supply. Asserted to indicate to the processor and bootstrap device logic that the ac power, as measured by the 300 Vdc bus to the power supply, is not within required limits.

DC LO

From the power supply. Asserted to indicate to the processor, memory, and device interfaces that the dc power from the power supply is not within required
limits.

LTC

Line Time Clock. From the power supply. Asserted every cycle of the line power to indicate real time to the processor.

BOOT ENAB

From the power supply. Asserted to enable the bootstrap loader program to occur when power is applied to the system. If the content of main memory has
been maintained by the battery backup unit after a power failure, a power
failed restart sequence can be initiated instead of the power-up reboot.

Table 3-3

Power Controller Signals

Signal

Function

POWR REQUEST

From the LOCAL or LOC DSBL position of the keyswitch on the CPU control
panel. Set to ground to enable the ac power at the switched receptacles.

SHUTDOWN

From the overtemperature sensor in the H7140-AA, -AB, -DA, -DB power supply.
Set to ground during an overtemperature condition to remove the ac power from
the switched receptacles.

3-3

LINE FILTER

Ful

1 INPUT

— POWER
—1 CABLE

EREE

v-t

L oA
—

;17

]

S o

I H l
!

%:::fi

)

AC HOT

230V 115V

CIS

INPUT ASSEMBLY (7016476)

300 VvDC
T

150 VDC

PWR REQUEST

cz2|

SHUT

DOWN

RTN

dah
300V

OOO

RTN

OOOO
FIG. 3-2 (SH2)

Figure 3-2

)

TK-4926

H7140-AA, -DA, -AB, -DB Power Supply Interconnection Diagram (Sheet 1 of 3)

FIG. 3-2 (SH3

FIG. 3-2 (SH1)

@@CPQ@@@@

]

1]4

300V RTN

RN
150V

([ 1—so0T Enag
2 |—BATT MON

300V

3 |— KEY

(NO. 7016487)

TB2

MODULE
(5413603)
RECTS

]BUS1

HEAT

]BUS?

ol =

z¥

LTJSSEQCE :|'y
|

a8 Q&

s I z O
w

203 ¥

) QEC';AUOLRAYTOR 5
541360

“ w

)

b—1

—

LOGIC INVERTER CONTROL MODULE

(MODULE'/')

g 2 2

(5413605)

SYNC

2116

o
N
1

' MEMORY
INVERTER

9 br—t5v
L mg
—

ASSEMBLY

TB1

912

G-¢

ASSEMBLY

BIAS &

[

6 }— DC ON

CIM CABLE

LOGIC INVERTER MODULE (5413599)

—{ 3

ac—

4 }—sSTDBY

10 P1

~°|

200V

. MOTHER MODULE (5413615) J5 /P!

)

BUS

gAr\'\/‘lEi%ngNfiE’g‘;géfl

—_—

J6 J7 J8

| Jt

M2 34 56 7 8 00111213
TO P1 OF CABLE
ASSEMBLY NO. 7016887

9 8

TO J1 ON CPU
BACKPLANE

POWER DISTRIBUTION MODULE (5413632)

RTN

Cto

s
T
LTl
2 345 6 7 8 9101112131415

NOTE

.35 | Jesseus

5 8

HBE

(5413601)

H7750-BA,-BB
BATTER BACKUP UNIT

o @

| ]

IHT

] 1 ]|

1 |

|J2

0 0O

[1 2345 6 7 891011121314 5] |

‘

J9J1OJ11T—

[coo

437

] [

DD11-CK, DK BACKPLANE
1K 4924

Figure 3-2

H7140-AA, -DA, -AB, -DB Power Supply Interconnection Diagram (Sheet 2 of 3)

BUTPUT ASSEMBLY (7016054)

L(_:]

._.l
E,I

41
36631

mfi

\
7

_flm__].p-—

41 3663-|

Q@@@@@OO@ OOO OO
TK-4924

Figure 3-2

H7140-AA, -DA, -AB, -DB Power Supply Interconnection Diagram (Sheet 3 of 3)

BATTERY BACKUP

DC ON (L}

—

FROM

06 ON (L)
L)

‘

CONSOLE §{ a—DATT MON

_[__

THERMAL

INTERFACE

AND

SHUTDOWN

CONTROL

GND BUS 3

o | rower

CONTROL

THERMAL SHUTDOWN | BUS1.2

BOOT ENABLE

LINE TIMING CLOCK } BACK

+» J pLANE
To

MEM DC LOW

* | BATTERY

[

+5VB

STDBY (L}

BACK-UP

DC LOW

AC LOW
LOGIC INVERTER ON L

LOGIC

VOLTAGE

~15V

g?fi% RY
BACK UP

L€

UNIT

CHONODE

MONITOR ENABLE

+300V

SE,L\/,\EY

INPUT

ASSEMBLY

300

BIAS

+300V

SENERAT

GENERATION

V BIAS {+12V)

GENERATION

+5V RETURN

REMOTE SENSE

MEMORY

FROM

PRIMARY
SOURCE

BACK UP
UNIT

+12V @5A
BATT IN

BATT
M

]

~12V @1A

MEM PWR OK (L)

+,-

PLANE

@ 3A
—15V
+5VB @10A

MEM DC ON (L)
BATTFRY

BACK.

+15V @ 3A

VOLTAGE
Y NE.
GENERATIONL

+300V
MEM INV ON L

115/230 VAC, 60 HZ, 1¢

A
+5V @120

+150v

POWEH

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SENSE

ONN (L)
EM OC

DC LO e THERMAL SHUTDOWN (L)

FAN
VOLTAGE

FAN

o GENERATION | BUST.2

ASSY
TK 3566

Figure 3-3

Power Supply Functional Block Diagram

3.2.1
Input Assembly
Figure 3-4 is a simplified diagram of the circuit schematic (CS7016476). The ac input from the cable

assembly is connected to the EMI line filter FL1. The output of the filter connects to circuit breaker
CBI and to the in-rush current limiting circuit consisting of resistor R1 and relay K1. When ac power is
applied, relay K1 is deenergized and resistor R1 limits the input current. When the dc output voltage of
the input assembly becomes 230 V, the relay is energized, the relay contacts close, and resistor R1 is
bypassed. When switch S1 is in the 120 V position the input circuit operates as a voltage doubler. When
the N terminal of the FL1 is more positive than the L terminal, current flows through CB1, the relay
contacts, R1, and diode CR1-B to charge capacitor C1. The current return is through S1, CB1, and to
the L input of FL1.
On the next half cycle of the ac voltage, the L terminal of FL1 is more positive than the N terminal.
Current flows through CB1 and switch S1 to charge capacitor C2. The return current is from C2
through diode CR1-A, the relay contacts, R1, CB1 and to the N terminal. Once relay K1 is energized,
the charge across C1 and C2 is approximately twice the peak value of the input ac voltage.
When the switch S1 is set to the 230 V position, the circuit provides full wave rectification of the input

ac. With terminal N more positive than L, current flows through CB1, the relay contacts or resistor R1,
diode CR1-B, and charges capacitors C1 and C2. The return current is through CR1-D, CBI1, and the L
terminal.
On the next half of the ac cycle, terminal L is more positive than terminal N. Current flows through

CBI, diode CR1-C, and again charges capacitors C1 and C2. The return current flows through CR1-A,
or the relay contacts, or R1, CB1, and terminal N.
3.2.2 Bias and Interface Circuits
Figure 3-4 shows the functions associated with the bias and interface module. The signals and voltages

developed by this module are transferred through the mother module to the other circuits in the power
supply. The bias and interface module monitors the voltages and signals and controls the power supply
operation.

3.2.2.1
Bias Voltage - Two bias voltages are developed and distributed to the modules in the power
supply. Sheet 1 of Figure 3-4 shows the circuits used to generate the +12 V and —15 V bias. The
+300 V from the input assembly is switched at a 20-kHz rate at transformer T1, mounted on the
mother module. The switching circuit is located on the bias and interface module. The output of transformer T1 is rectified and filtered to produce the two bias voltages +12 Vand —15 V. The +12 V bias
voltage is applied to relay K1 of the input assembly. When the RELAY DRIVE signal from the bias
and interface module is asserted, the relay is activated and the relay contacts bypass the series limiting
resistor in the ac line.

3.2.2.2 DC Voltage Monitoring — Sheet 2 of Figure 3-4 shows the circuit used to monitor the dc voltages developed by the input assembly circuits. The 4300 Vdc is applied as an input to the +300 V
monitor circuit. When ac power is initially applied to the power supply, relay K1 on the input assembly
(Figure 3-2) is deenergized and allows the input ac current to flow through the current limiting resistor
R1. When the dc voltage to the 300 V monitor circuit becomes 230 V or greater, the output of the relay
drive current energizes relay K1 and the relay contacts bypass resistor R1.
3.2.2.3 Normal Operation — When the keyswitch on the front panel is set to the LOCAL or LOC
DSBL position, the DC ON (L) signal to the bias and interface module (Figure 3-4, sheet 3) will be
low. This signal is applied to the turn-on control logic to produce a low LOGIC INV ON L signal. The
LOGIC INV ON L signal is used to enable the +5 V, +15 V, and —15 Vdc outputs of the logic
inverter control module. The DC ON (L) signal is also used to enable the MEM DC ON L and the
MEM INV ON L signals which generate the +5 V, +12 V and —12 V memory voltages.

3-8

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Figure 3-4

Bias and Interface Circuits, Block Diagram
(Sheet 1 of 4)

MOTHER

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BIAS & INTERFACE MODULE (5413605)

pad

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£11.506

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300V

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Figure 3-4

Bias and Interface Circuits, Block Diagram
(Sheet 2 of 4)

3607

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POWER

CONTROLLER— &

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MEMORY REGULATOR

MODULE (5413607)

MOTHER MODULE
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Figure 3-4

MOTHER MODULE

Bias and Interface Circuits, Block Diagram
(Sheet 3 of 4)

BIAS & INTERFACE MODULE (5413605)

(5413615)

MOTHER

MODULE

(54138615)

MEMORY
POWER

MONITOR

MEM

MEM DC

SH2

FROM

(FIG.3-7)M I—
2o
|
19

BATTERY{%
FROM

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MON EN

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UNIT

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(FIG. 3-7)

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(FIG. 361" Q2,7

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—==

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[

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BATT MON

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UNIT

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0
BATTERY
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V
FAN
(FIG. 3-13)

TK 3498

Figure 3-4

Bias and Interface Circuits, Block Diagram
(Sheet 4 of 4)

3-11

3.2.2.4 Standby Operation — When the keyswitch on the front panel is set to the STDBY position, the
STDBY (L) signal to the bias and interface module becomes low. This signal is transferred through the
mother module to the turn on control logic. The MEM DC ON L and MEM INV ON L outputs generated during normal H7140 operation remain asserted and thus enable continued operation of the memory voltages and fan voltage generation circuits. The LOGIC INV ON L output however becomes unasserted during standby operation. This inhibits operation of the logic voltages generation circuit.

3.2.2.5 Temperature Sensing — The temperature sensor (S1), mounted on the output assembly heat
sink, has normally open contacts that close during an overtemperature condition. When the contacts
close, a grounded input is applied to a temperature monitor circuit in the bias and interface control
module. The THERMAL SHUTDOWN (L) signal inhibits the generation of MEM DC ON L, LOGIC INV ON L and MEM INV ON L.

3.2.2.6 Line Time Clock (LTC) Signal — The LTC signal is generated by monitoring the ac line frequency from the input assembly. The LTC output is a square-wave pulse synchronized with the frequency of the input ac (47 to 63 Hz) and isolated via photo transistor E14. The LTC signal is distributed through the mother module to the CPU and expander backplanes.
3.2.3

Memory Voltage

The memory inverter module and the memory regulator module generate and distribute three memory
voltages (+5 B, +12 Vand —12 V) to the CPU backplane. The memory inverter module converts the
300 Vdc supplied by the input assembly into +35 Vdc. The memory regulator module converts the
+35 Vdc into +12 V, —12 V and +5 B. Figure 3-5 is a simplified diagram of the memory voltage
generation circuits.

3.2.3.1 435 Vde - The +35 Vdc is produced by a dc-to-ac inverter circuit on the memory inverter
module shown in sheet 2 of Figure 3-5. The inverter receives + 300 Vdc from the input assembly and is
switched at a 30-kHz rate by the output of the driver circuit.

The 3524 pulse-width modulator (sheet 1) contains a 60-kHz oscillator which provides the basic switching frequency. The 60 kHz is divided by two and the output is used to control the conduction time of
the driver transistor.

The output of the rectifier filter is monitored by the pulse-width modulator and by the overvoltage monitor on the output sense voltages line. An error amplifier in the modulator compares the +35 Vdc with
the voltage developed by the reference generator. When a difference is sensed between the two voltages, the output of the error amplifier varies the width of the 30-kHz pulse, thereby controlling the
conduction interval of the transistor in the driver circuit.

The overvoltage monitor circuit disables the generation of the +35 Vdc in the event the +35 Vdc is
increased to +48 V or greater. The output of the monitor controls the turn-off enable circuit. The output of the turn-off enable circuit is applied to the inhibit logic which generates the output inhibit signal.
This signal will disable the dc-to-ac inverter when the +35 V increases to the level previously specified.
The over current monitor circuit senses the current through a transformer in the dc-to-ac inverter. The
+ and — pulse current sense input to the monitor develops a voltage to a comparator. This voltage is
compared with a reference voltage and the output of the comparator controls the operation of a oneshot pulse generator. When the pulse current sense voltage increases due to an overcurrent condition in
the dc-to-ac inverter, an output of the one-shot pulse is produced. The 1.5-ms turn-off signal to the inhibit logic disables the dc-to-ac inverter in a similar manner as the overvoltage condition. The overcurrent monitor continues to generate the inhibit pulses until the overcurrent condition is removed.

3-12

44O

MEMORY INVERTER MODULE (5413603)

(FIG. 34, SH1)
FROM

+12V BIAS

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+,~PULSE

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CURRENT

—’C’|

CURRENT SENSE

MONITOR

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1315

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Figure 3-5

Memory Voltage Generation Functional Block Diagram
(Sheet 1 of 2)

1—

¥ov

010,

SYNC ENABLE

SH1

syne

.(D

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G MEMORY

INVERTER MODULE (5413603)

MEMORY REGULATOR MODULE (5413607)

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+,~PULSE

CURRENT

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MEM
DC ON (L)

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UNIT

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OUTPUT SENSE VOLTAGE

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103

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V REFI

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Figure 3-5

(FIG. 3-4, SH4)

(FI1G.3-7)

BACKPLANE

+12Vv

SHUTDOWN

V REF

—128

REGULATOR
(FIG. 3-8)

CLOCK

12V @1A

_
BLANKING
+35V

Memory Voltage Generation Functional Block Diagram

(Sheet 2 of 2)

3501

Memory Voltage Regulators

3.2.4

The memory regulator module, shown in sheet 2 of Figure 3-5, supplies the three memory voltages to
the backplane. The +35 Vdc is supplied to each of the voltage generators and the memory output voltages are controlled by the conduction times of the three independent switching regulator circuits.

If the H7750 battery backup unit is installed when the ac power fails, the +35 V is supplied by the
H7750 unit. This ensures that the memory regulator module continues to generate the +5 B, +12 V,
and — 12 V to memory and that the bias and interface module continues to generate power for the fans.

3.2.4.1 +5 B Regulator Circuit - Figure 3-6 is a block diagram of the +5 B regulator circuit. The +5

B is generated from the +35 V by the series switch circuit consisting of transistors Q5 and Q6, and the
charging circuit consisting of diode D4, choke L1, and C4. When Q5 and Q6 are off, the stored energy
in L1 provides the current to the load.

The switching circuit is controlled by transistor Q11 which is switched on by the output of the pulsewidth modulator E7. The pulse-width modulator is driven by the clock-pulse generator ES which triggers the one-shot pulse generator E5SB. The pulsed output of ESB provides the basic timing of the power
supply

The +35 B output current is monitored by the overcurrent comparator E1. If excessive current occurs
on the +5 B output, comparator E1 turns off the series switching circuit to open and prevent an overload condition on the +5 B power supply.

The overvoltage circuit, consisting of thyristors Q3 and Q4, monitors the voltage at the +5 B output.
When the voltage exceeds a specified level, Q3 and Q4 are switched on and short the output to be
grounded. The overvoltage circuit also causes the series switch to open, preventing the high current
caused by the grounded output from damaging the circuits.

The +5 B output is normally controlled by the pulse-width modulator E7. This modulator provides
pulses of variable duration to the switch control Q11. The pulse widths can vary from 0—13 us at the 30
kHz switching frequency. The +5 B sense comparator monitors the +35 B output and compares the
voltage with V REF developed by the reference voltage circuit consisting of transistor Q9, regulator
E3, and amplifier E6.

The output of the sense comparator E6 varies the dc input to the control input of the pulse-width modulator. When the +35 B voltage is lower than the V REF voltage, the sense comparator output causes

the width of the pulses from the modulator E7 to be increased. The series switching circuit is then
allowed to conduct for a longer duration and the +5 B output voltage is increased.

When the output voltage is greater than the V REF voltage, the sense comparator output causes the
width of the pulses from modulator E7 to decrease. This results in a lower +5 B output voltage.
3.2.4.2 +12 B Regulator Circuit — Figure 3-7 is a block diagram of the circuits that develop the +12
B voltage for the memory modules. These circuits operate in a similar manner to the circuits described
for the +5 B. The +35 V is converted to + 12 B by the switching transistors Q7 and Q8, the flyback
and averaging circuit D6, L2, and C11. The overcurrent circuit E9 and the overvoltage circuit Q2, Q26
and diode D36 provide the overload protection for the +12 B power supply circuits. The pulse-width
modulator E10 is triggered at a 30-kHz rate by the clock-pulses from the +5 B output (Figure 3-6).
The blanking pulse prevents switch control Q10 from conducting until 10 us after the leading edge of
the pulse from the pulse-width modulator has occurred. This allows the pulse width to be reduced to
zero when required.

3-15

MOTHER

BIAS & INTERFACE

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MODULE (5413605)

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{FIG. 3.7}

LOGIC INVERTER

J3E N, CONTROL
12 m

LRTNSENSE
_ 12v GENERATION
(F1G. 38}

Figure 3-6

+35 B Voltage Regulator, Circuit Block Diagram

3508

MODULE (5413615)
SERIES
SWITCHING

+35V

(FIG. 3.6) TM0 \—0——————"" XISTORS
BASE

TURN-ON

FROM
F1G.37,38

.28
SHUTDOWN

BLANKING

SIGNAL |
(FIG. 3-6)

RECT/
FILTER

= SH2

+12V @ bA

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CROWBAR

L, OVER

VOLTAGE

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E6

[GND |

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TIMER CONTROL

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| TUAN
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6,7
FH

L2, D6
C11, R36

PULSE
AMPL

CLOCK

FROM

DRIVE

POWER
DISTRIBUTION
MODULE

MOTHER

MEMORY REGUL.ATOR MODULE (5413607)

TO BIAS AND
Le \ INTERFACE

. { MODULE

(FIG. 3-4, $H4)

D14, D16

Figure 3-7

+12 B Voltage Regulator, Block Diagram

3504

The +12.B SHUTDOWN level from the + 5 B regulator circuit disables the generation of the + 12
voltage when the +5 B is not within the preset levels, and provides the power generation sequence
required by certain devices.
The +12 V voltage comparator E6 monitors the +12 B output voltage and compares it with the V
REF level generated on the 45 B regulator (Figure 3-6). The comparator output controls modulator
E10 in a similar manner to modulator E7 in the +5 B regulator. The + 12 B comparator E2 generates

the MEM POWER OK (L) signal to enable the controlling signals in the bias and interface module.

3.2.4.3 HT7140-AA, -AB —12 B Regulator Circuit - Figure 3-8 is the block diagram of the —12 B
regulator circuit. These circuits operate in a similar manner to the circuits described for the +5 V
regulator. The +35 V is converted to the —12 B voltage by the operation of the switching circuit consisting
of transistors Q13 and Q14, and by the charging circuit consisting of diode D3 and choke L3. The negative
voltage is developed by L3 which is connected to ground instead of being in series with the output. The
overcurrent circuit E6 and the overvoltage circuit consisting of Q6, Q12, and D18 prevent damage when
the output voltage or current exceeds the preset levels.
The pulse-width modulator timer E8 is also triggered at a 30-kHz rate by the clock pulses from the +5
B regulator circuit. The blanking pulses perform the same function as the 412 B regulator circuit.

The duration of the pulses from pulse-width modulator ES8 is controlled by the output of sense amplifier
E6. The +12 B SHUTDOWN level will also disable the generation of the +12 B voltage when the
— 12 B regulator voltage is not within specified levels.

3.24.4

H7140-DA, -DB —15 B Regulator Circuit — Figure 3-8 is the block diagram of the —15 B
regulator circuit. These circuits operate in a similar manner to the circuits described for the +5 V
regulator. The +35 V is converted to the —15 B voltage by the operation of the switching circuit consisting
of transistors Q13 and Q14, and by the charging circuit consisting of diode D3 and choke L3. The negative
voltage is developed by L3 which is connected to ground instead of being in series with the output. The
overcurrent circuit E6 and the overvoltage circuit consisting of Q6, Q12, and D18 prevent damage when
the output voltage or current exceeds the preset levels.

The pulse-width modulator timer ES is also triggered at a 30-kHz rate by the clock pulses from the +5 B
regulator circuit. The blanking pulses perform the same function as the +12 B regulator circuit.
The duration of the pulses from pulse-width modulator E8 is controlled by the output of sense amplifier
E6. The +12 B SHUTDOWN level will also disable the generation of the +12 B voltage when the —15 B

regulator voltage is not within specified levels.

MEMORY REGULATOR MODULE (5413607)
2 AMP

(

+35V

PULSE
AMPL

BLANKING

(FIG. 3-6}

SIGNAL

W__ 2

SH3
.

XISTOR
15TO

ABASE
TURN-ON

FROM

semies
sHa

DRIVE

RESET

SH3Eg

Q13,14

Q20

CROWBAR

VOLTAGE

OVER YV

SH3
8?’812
OVER

TURN
OFF

OVER !

TURN

- SE';‘SE

[

&
12vs
18 1N

12V
17, TO
8 é’ BACK
PLANE
BIAS

INTERFACE

OR —15B SENSE
TIMER

CONTROL

61-¢

Q15,19

Vv l

sHa

v HEF

A
R77

DISTRIBUTION

MODULE

SH3

of CONT
LRTN SENSE

) —P
rd 2 J10

11
)
—-(

POWER

MODULE

(5413615)

INHIBIT

CURRENT | OFF

~12V @ 1A

SENSE

SH3

OR —15V @ 1A

FILTER

TIMER

CLOCK

_»

nect

INHIBIT

Q18

MOTHER

——

g:fUVT

PD—-

MODULE

(5413605)

DOWN

—» {FIG 3-7)

+12V GENERATION

D19

TK-3509

Figure 3-8

—12 B, —15 B Regulator, Block Diagram

3.2.5

Logic Voltage Generation

The logic inverter module, the logic inverter control module, and the output assembly generate the voltages used by the CPU modules in the system. The output voltages are +-5.0 V at 120 A*, +15V at 3
A, and —15 V at 3 A and are distributed to the CPU backplane and to any additional backplanes.
Figure 3-9 is a functional diagram of the circuits used to develop the logic module voltages. The logic
inverter module receives 4300 V (nominal) from the input assembly. This input is pulsed by a variablewidth pulse generated in the logic inverter control module. The logic inverter module output is 30 kHz
power that is converted to three logic voltages. The main output is 5.1 V at 120 A. Two regulators on
the logic inverter control module convert the 30 kHz power to 415 V and —15 V logic voltages.
The logic inverter control module receives a +5 V REMOTE SENSE signal from the +5 V at the

CPU backplane. This signal is applied to the input of sense amplifier E2, the output of whichis +2.5V
(nominal). Within the 3524 pulse-width amplifier, the 4+ 2.5 V and a reference voltage are applied to an
error amplifier. A comparator in the 3524 produces a pulse, the width of which is proportional to the
error amplifier output. The comparator output is gated at 30 kHz and applied through drivers to a
switching transistor in the logic inverter module.
The switching transistors Q2—35 are configured in an H-forward converter circuit that converts + 300
V (nominal) to three logic voltage outputs.

*The 5 V, 120 A output must be derated according to the following formula if the =15 V current exceeds 1 A:
[=120A —5[I -1+ (d=1)]
(5 V) (+15) (—15)
Example: If the +15 V and —15 V are fully loaded to 3 A each, the 5 V output would be derated to 100 A.
I=120A — [3—1)+ 3—1)] = 100
A

(5V)

3-20

+12V BIAS

LOGIC INVERTER CONTROL MODULE (5413601)

FROM

FIG. 3-4 (SH 1)

CROWBAR

GEN
SH1

OVER.

CURRENT

MONITOR

SH1

+ — PULSE CURRENT SENSE

—

F—

D29, D30 | SIGNAL

SH1

D43, D50

| REF V GEN

ENABLE
SH1

ATOR

V GEN
REF

REMOTE

RTN
REMOTE

SENSE

COMPAR

—

]

SENSE

Q11.Q22

FREQ COMPENSATION ] o

Q1, Q9

BACKPLANE

SH1

TURN OFF

FROMBUS/+5V

DRIVER

13,15

1BV

Q14,Q18,021

[

OUTPUT INHIBIT

3524 PULSE WIDTH AMPLIFIER SH1, E3

INHIBIT

TURN-OFF

CROWBAR GATE
e

D 35,08

SENSE

|1E

+2.5V ( (NOMINAL)

AMPL

2;”

ERROR

AMPL

ERROR

VOLTAGE

-r pajxnz DRIVER

c15

1111

12-¢

TM
-

FROM

_L30 KHZ

INPUT ASSEMBLY =

ay.

FROM

(FIG. 3-6)

SYNCUN)

sYnC

R57

AMPL
EXT

SYN(C

FIG. 3.2

USEC

COUNTER

SH1

r——

Q13

CONTROL

ON L

REGULA-

+15V ENABLE

TORS

SH1

(FIG. 3-4, SH3)

J______@

TURN-ON

LOGIC

FROM

—s )-.@

Q4, Q10

ENABLE
SH1
Q2, a3

15V ENABLE

TK 3502

Figure 3-9

Logic Module Voltage Generation, Functional Diagram
(Sheet 1 of 2)

]
+ .-PULSE

CURRENT

SENSE

LOGIC INVERTER MODULE (5413599)

QUTPUT ASSEMBLY

CROWBAR GATE

(7016054)

PULSE

CURRENT

SENSE

XFMR

SH1

DC TO-AC

| conversion

T1, E4

TURN OFF

{SH1)
T2.T4

XISTOR
COLL, BASE

(:)

SWITCHING
XISTOR

:::

Q2-05
D12-D19

c1.c2

45V ® 120A

RESET

GEN 3.10)
(FIG.

DIODES

+ 300V

30 KHZ

)
+5V @ 120A

ISH1)

120V

D7.D8

30 KHZ

,LOG|CINVERTER CONTROL MODULE (5413601)

i JTTT

V RAMP

+15V ENABLE

égx

BUS

12V,

10
Lgack.

PLANE

(FIG. 3-12}

SYNC ENABLE

'WSY

GEN

-15v

(FIG. 311}

FROM
=12V BIAS
15V ENABLE

Figure 3-9

{FIG. 34, 5H1I

Logic Module Voltage Generation, Functional Diagram

(Sheet 2 of 2)

3.2.5.1
+5V at 120 A Logic Power — The output assembly, shown in Figure 3-2 (sheet 3), provides
the transformer coupling, LC filtering, and rectification for the main +5 V at 120 A output. In addi-

tion, it consists of a snubber module and crowbar circuit. The input transformer also provides 120 V., 30

kHz to the +15 V and — 15 V generation power supply circuits.

3.25.2
—15V Logic Power — The —15 V power for the logic modules is generated by the circuits
shown in Figure 3-10. The logic inverter module generates a — 15 V output by a series switching transistor that is controlled via a pulse-width modulated negative feedback loop.

The 30 kHz, 120 V from the main inverter module is applied to series switching transistors Q7, Q8.
These transistors are controlled by a voltage sense network, error amplifier, pulse-width control, and

drive control. The voltage sense network, consisting of R47, R89, R92, and R93, is connected to the
—15 V input and the filter choke output. One input to the error amplifier is from the voltage sense
network. The other input is a voltage reference. The error amplifier output modulates one input of the
pulse-width control consisting of comparator E1, R48, and R90. The other input is a ramp voltage (V
RAMP). The comparator produces an output that is proportional to the input error signal, which causes

[]

ISt

[\
NI

the base drive transistor to turn the series switching transistor on for the required time to maintain the
output voltage at —15 V.

LOGIC INVERTER CONTROL MODULE (5413601)

MODULE(54]1359
TB2
=

DB
3.4}

QUTPUT
ASSEMBLY

;(%Sm
SWITCHING |——=| SENSE
RESISTOR

XISTORS

| LOGIC
i _Pu YOLTAGE

15V INPUT
(LOwW)

SH2

R47, 89,

——

DRIVE

WIDTH

92,93

BASE

PULSE

ERROR

AMPL

] SENSE

(5413615)

CURRENT

SERIES

(HIGH)

1
|

]

{F1G. 3-2, 514 3) |

MOTHER
MODULE

~ 15V INPUT

{LOGIC INVERTER

SH2

RS2

SH2

Q7.8

J13

BUS1

»{ CONTROL |-+ CONTROL |

V REF

+12V BIAS

V RAMP
SYNC

8H2

E1, Rag
RI0

e
Q

INVERTER

ENABLE

sh2

—*

Q17

SYNC ENABLE _ TO
+15V

CROWBAR

GEN

1443

{FIG. 312)

—15V ENABLE

CURRENT
SENSE
SH2

{SH2)

D13.D16

TURN-

OFF

145 ‘)] CONTROL {1

-15v

< BACK-

{—TO

*| R22-R25

5,06

PLANE

SH2
Q20

POWER
DISTRIBUTION
MODULE

15V ENABLE

E1.C27,

Lel

FILTER
CHOKE

R49

e e

SH2

—15V

H,J

25,

(5413632)
et

—ibVv

FK 3499

Figure 3-10

~15 V Power, Functional Diagram

The —15 V regulator contains overcurrent and overvoltage circuits. They function similar to those in
the memory regulator module.

3.2.5.3 +15V Power - The logic inverter module generates a 4+ 15 V output, which is similar to the
operation of the —15 V circuit. The major functional difference is the location of the filter choke in
both circuits. Figure 3-11 is the functional diagram for the 415 V power.

3.2.6 Fan Voltage Generation
The bias and interface module shown on Figure 3-12 contains a fan voltage generation circuit that generates a 35 V, square-wave power for the fan assembly. The circuit consists of an oscillator, a divide-bytwo counter, output control, and output drivers. It functions during normal and standby operation of the
power supply and also when the power supply receives power from the battery backup unit.

During normal and standby operation of the power supply, the fan voltage circuit receives a +35 Vdc
input from the memory inverter module. During battery power backup mode, it receives a +33 Vdc
input (MEM BATT IN) from the battery backup unit (H7750).
The +35 Vinput is applied to a free-running oscillator (E12) via an R-C network (R34, R32, R40) that
establishes the oscillator nominal frequency at 150 Hz (for a nominal +35 V input). The oscillator
output is applied to a divide-by-two counter (E8). The 75-Hz signal output of E8 is then applied to the
output control and drivers. The square-wave output of the drivers is applied to the fan assembly.
3.3 872-D, -E POWER CONTROLLER FUNCTIONS
The 872-D, -E power controller unit controls and distributes the AC power to the units within the cabinet. Figure 3-13 is a simplified diagram of the components and circuits within the unit. The 872-D, -E
provides three dual switched receptacles that can be remotely controlled, and one dual receptacle that
is controlled by the circuit breaker on the 872-D, -E.

The unit includes a line filter FL1, a LOCAL/REMOTE control switch S1, and an ac indicator L1.
A power control bus connects the 872-D, -E unit to the BA11-A mounting box and to other units in the
system. Under normal operation, the LOCAL/REMOTE switch S1 is set to the REMOTE position.
Application of ac power to the units connected to the switched receptacles is controlled by the keyswitch on the control panel of the BA11-A. When the switch is in the DC OFF position, the ac power is
removed by the POWER-REQUEST signal to the ac control board Al. In all other positions of the
keyswitch, the ac power will be applied. When an overtemperature condition exists in a unit connected
to the power control bus, the SHUTDOWN signal to the ac control board Al will also runover the ac
power from the switched receptacles of the 872-D, -E unit.

When switch S1 is in the LOCAL position, the external power controller bus signals are disabled and
the ac power at all receptacles on the 872-D, -E is controlled only by circuit breaker CB1. Circuit schematic (C5) 872-0-2 shows the complete internal wiring of the power controller unit.
3.4

H7750 BATTERY BACKUP FUNCTIONS

The H7750 battery backup units are optional and available in the following voltage configurations.
Model

Voltage

H7750-AA
H7750-AB
H7750-AC
H7750-AD
H7750-BA
H7750-BD

115 Vac/60 Hz
230 Vac/60 Hz
115 Vac/50 Hz
230 Vac/50 Hz
115 Vac/60 Hz
230 Vac/50 Hz
3-24

LOGIC INVERTER
MODULE (5413599)
8

TB2

'6"

LOGIC

INPUT
(LOW)

7.8

+15V INPUT (LOW)

SERIES

@ 120A

(FIG.
3101

]

(HIGH)

+Ho

56|

SYNC ENABLE

+15V
INPUT

VOLTAGE

ERROR

FILTER

oh2

XISTORS

PULSE

WIDTH

CONTROL

CURRENT

DRivE

- g?: >

RESISTOR

NEpETinas

SH2

R27

Qs, 6

BASE

ATN

SENSE

SH2

| |

ampr

SENSE

SWITCHING | TM] CHOKE

V5V

GEN

MOTHER
%%?gél%)

+15V

++o4—

FROM

LOGIC INVERTER CONTROL MODULE (5413601)

CONTROL

R51,R53
R70,R75

SH2

V REF

gfg

R72

R65, R67

SH2

Q15

+12V BIAS

¢l

V RAMP

+15V ENABLE
CURRENT
SENSE

_V ReR)

(T)gEN

)

)27 )| conTRoL

SH2

CROWBAR

CIRCUIT
SH?

Q16

D6, D9-D12

+15V ENABLE

2318'0320
,

J11

SH2

+1BV

BACK-

<___ PLANE

E1,C29

R64, R65

POWER

+15v

Ji
N
7

|34

413

jco

DISTRIBUTION

26,
28

c6 I

MODULE (5413632)
+16V

, c7

TK-3512

Figure 3-11

+15 V Power, Functional Diagram

BIAS 8 INTERFACE MODULE (5413605)

Moo

DIVIDE-

150HZ CSJNWT(')ER

MOTHER MODULE

(5413615)

3By U6
AND __< PR,
+BAT

OUTPUT

DRIVERS

OUTPUT

0sc

SH2
£12

13,149\

CONTROL

PERSHZ |o7
FREE.
RUNNING ot 8
IL | s

12 MEM
BATT IN
/

35V, 75 HZ

MOTHER

FAN

VODULE)

ASSEMBLY

5413615

AB, 24

! |ac, 25 |N
> ECS 2J3
>
!I
|' FAN

[BHz]sne

Q16, 020 35V, 75H |
l
td

R31, R34

c6, C7

7 22

>J_BU51

RED

TO
FANS

WHT

J-} AA, 23 >1—
MEM DC ON{L)

FROM

(FIG. 3-4, SH3)

DCLO

THERMAL
SHUTDOWN
(L)

Figure 3-12

872-D, -E

Fan Voltage Generation, Functional Diagram

POWER CONTROLLER
UNIT

LOCAL/REMOTE

SWITCH

INDICATOR
L1

AC POWER

LINE

FILTER

CIRCUIT

BREAKER

AC
o
CONTROL
BOARD

SHUTDOWN

POWER REQUEST

POWER

CONTROL
BUS

‘_—_‘

E%LAY

ONE DUAL

THREE DUAL

NONSWITCHED

SWITCHED

AC RECEPTACLE

RECEPTACLES

TK-5640

Figure 3-13

872-D, -E Unit, Simplified Diagram

3-26

These units can be installed in the cabinet to provide dc refresh power to the MOS memory in the CPU,
and to provide power to operate the fans in the event of an ac power failure to the CPU cabinet. The
units contain three sealed, 12 Vdc, lead acid batteries connected in series to provide +36 Vdc. The
minimum discharge rates are as follows.
Discharge Time

Watts

S5 minutes
7 minutes
10 minutes
20 minutes

360
265
175
90

The recharge time is 14 to 16 hours. Terminals on the front of the unit allow external batteries to be
connected to increase the operating time.

The +36 Vdc is supplied to the memory regulator module and to the bias and interface module in the
H7140-AA, -DA, -AB, -DB power supply. Figure 3-14 is a simplified diagram of the H7750 unit. It
consists of a rectifier circuit, battery charger, voltage regulator and an output control circuit. An
124 VA
automatic alaa:
shutoff circuit disconnects th
the +36
Vdc outputin the event of excessive current drain. The
condition of the batteryis monitored by the CPU on the CHG MODE line and MON ENAB indicates
when the battery backup unit is supplying power.

SHUTDOWN

J11 AND J10

SDF;L:VTN

VOLTAGE | i

115/230
| FUSE —-:TANSFORMER-’ RECTIFIER
vac

NPUT

CHARGE
RATE

SWITCH

% 12,083
RDC

REGULATOR

)

L OUTPUT

CONTROL

Vv REF
TM RELAY

=312V
= BATTERIES

GND

“BAT
|
13

tf_

BACKUP

CHG MODE

R
>

————

+5 V8
MON EN

CABLE =

701452005

TK-5703

Figure 3-14

H7750 Unit, Simplified Diagram

The charging circuit controls the battery charging rate. There are two charging rates: the fast rate is
approximately 500 MA and the trickle rate is approximately 15 MA. The fast charge rate is initiated
during H7750 turn-on and continues until battery voltage increases to +44 V. At +44 V, the fast
charging stops and trickie charging starts.

3-27

Signals and Voltages
The output control circuit monitors four fault conditions.
o=

3.4.1

AC low
thermal shutdown
no regulator output present
battery voltage low

If the +35 V from the memory inverter module becomes less than 20 V, the battery backup unit
switches the batteries on.
3.4.2

Battery Backup Operation

The rectifier and regulator supply the charging current and a relay connects the batteries to the
charger. The output control circuit connects the batteries to the memory regulator in the H7140 power
supply. The rectifier operates from the ac input and supplies a full charging current until the battery
voltage reaches approximately 90 percent of its full charge rating. After this level, the charge rate
switch supplies a trickle charge to maintain the charge on the batteries. The rate of chargingis sensed
to develop the charge mode signal to the H7140.
The memory regulator produces +12 V, —12 V, and + 5 outputs until the batteries discharge below 27
V. A voltage reference is used by a relay in the H7750 to disconnect the batteries from the regulator
and to prevent the batteries from discharging completely. The batteries will also be disconnected by the
output control if the + 5 B signal from the H7140 memory regulator goes to zero volts or if any thermal
switch signals an overtemperature condition.

3-28

CHAPTER 4
SERVICE

This chapter provides the information required to evaluate the performance of the BATI-A mounting
box, to isolate malfunctions in the power supply and associated devices, and to remove and replace
defective units and assemblies.

4.1

POWER CHECKS

The system contains several indicators that can be used to check the ac and dc power to the system.
The 872-D, -E power controller unit contains an ac indicator that is lighted when ac power is applied.
The control panel of the BA11-A also contains a DC ON indicator that displays the status of the dc
voltage from the power supply.
AC Power Distribution

4.1.1

The ac power in the BA11-A system cabinet is distributed from the 872-D, -E power controlier, or a
similar power controller unit. The 872-D, -E unit contains three dual switched ac receptacles and one
dual unswitched receptacle. The ac power to the switched receptacles is controlled by the LOCAL/OFF/REMOTE switch on the control panel of the 872-D, -E unit, or, if the LOCAL/OFF/REMOTE switch is in the REMOTE position, by the keyswitch on the front panel of the
:

mounting box.

4.1.1.1 Initial AC Power Checks — To check the ac power in the system, perform the following checks.
1.

Ensure that the keyswitch on the control panel of the mounting box is in the LOCAL or

Check that the ac indicator on the control panel of the 872-D, -E unit is lighted.

If the indicator is not lighted, check the main ac power outlet to ensure the ac voltage is

LOC DSBL position.

present.

If the indicator is lighted, check that the circuit breaker on the 872-D,-E power controller

Check that the LOCAL-ON/OFF/REMOTE-ON switch on the power controller is in the

If in the REMOTE-ON position, set the switch to the LOCAL-ON position.

If ac power is not applied, remove connector P1 or P2 from the dc power control bus on the

unit is in the ON (1) position.

LOCAL-ON or REMOTE-ON position.

power control unit.

If pin | of P1 is open to ground, check the continuity of the power control cable between

connector Pl and P2.

4-1

Remove connector Pl from J3 on the rear of the BA11-A mounting box.

IG.

If pin 1 of J2 15 Open to ground, the mounting box wiring is defective.

11.

Ifpin 2 of PI in step 7 is grounded, an overtemperature condition exists in a unit within the
system cabinet or peripheral cabinet.

4.1.2

DC Power Distribution
The dc voltages from the power supply are distributed to the CPU backplane and to any optional

backplanes in the mounting box. The DC ON indicator on the control panel of the mounting box
monitors the dc voltages and provides a visual indication of power failures.
4.1.2.1

1.
2.

Initial DC Power Checks - If a dc power failure is indicated, perform the following checks.

Perform steps I through 5 of Paragraph 4.1.1.1.
Measure the +5 V CPU backplane voltage at the connector end ofthe flexprint cable shown

on Figure 4-1.
CAUTION
When measuring the +5 V bus voltage, do not short
the +5 V bus and ground bus together.

4.2

Measure the remaining backplane voltages at connector P1 of the power flexprint cable shown
on Figure 4-1. Table 4-1 or 4-2 indicates the voltage and signal connections on P1.

If a dc voltage failure is evident, remove and replace the H7140-AA, -AB, -DA, -DB power
supply as described in Paragraph 4.2.4.

REMOVAL AND REPLACEMENT PROCEDURES

This section describes the procedures for removing and replacing the main units and assemblies within

the BA11-A mounting box.
4.2.1

BA11-A Mounting Box in PDP-11X44 or Similar Cabinet
In the PDP-11X44 or similar system cabinet, the BA11-AA, -AB mounting box is located at the top of

the system cabinet. To remove or replace the unit, perform the procedures described in subsequent

paragraphs.

Two types of release mechanisms are in use to allow the BA11-A mounting box to be raised to the

servicing position. The type mechanism the cabinet contains can be identified by the top cover configuration as shown in Figure 4-2. The cabinet with the type A release has filler strips located at the
rear of the unit. The cabinet with the type B release has a one-piece top cover.

4.2.1.1 Mounting Box Removal - To remove the BA11-A mounting box {rom the PDP-11X44 or
similar system cabinet, perform the following procedures.
.

Open the rear door of the cabinet. Use a 4.0 mm (5/32 in) hex wrench to release the door
fastener.

Remove the ac power from the power controller by setting the circuit breaker in the OFF (0)
position (Figure 2-7).

Ao~

SYSTEM BACKPLANE
PIN SIDE
SLoT

~ O£ ON

=2 jas pus Lt 5

x =3

Ryl

4
o]f

|&]

p-d

1) (o]

]

)

- »n

LS S S

ROW

POWER

FLEXPRINT
CABLE

TK 4381

Figure 4-1

Backplane Assembly, Pin Designations

4-3

Table 4-1

-AA, -AB CPU Backplane Connector P1, Signals and Voltages
Pin

Table 4-2

Function

1-10

+5B

11-16"
17,18
19
20
21
22
23
24
25,27
26,28

+12 VB

-12 VB

LTC
BUSACLOL
BOOT ENABL

BUSdcLOL
GND SENSE
+5SENSE
-15
+15

-DA, -DB CPU Backplane Connector P1, Signals and Voltages
Pin

Function

1-10

+5 B
+12 VB
NC

11-16

17, 18
19

LTC
BUS ACLO L
BOOT ENAB L
BUSdc LOL
GND SENSE
+5 SENSE
—-15 VB
+135

21
22

23
24
25, 27
26, 28

4-4

TYPE A

TYPE B

FILLER STRIPS

ONE PIECE CABINET

TOP COVER

CABINET

TOP COVER

CABINET

REAR

CABINET
REAR

Figure 4-2

Cabinet Type Identification

Remove the BA11-A power cord plug from the unswitched receptacie at the rear of the

power controller.

Cut or release any fasteners that secure the power cord to the cabinet frame.
If the release mechanism is type A (see Paragraph 4.2.1), insert the blade of a small screwdriver into the hole behind the slot which is located at the top right side of the front bezel
(Figure 4-3).
Sa.

Release the latch which holds the mounting box by sliding the screwdriver in the direction
shown in Figure 4-3.

5b.

Raise the front of the mounting box until the unit is at an angle of approximately 45° with

the top of the cabinet.
5c.

Loosen the four (10-32) screws that hold the cover brackets to the left and right sides of the

mounting box (Figure 4-4). Do not remove the screws.

5d.

Remove the top cover assembly.

Se.

Lower the front of the mounting box until it is in the normal position and the latch engages.
If the release mechanism is type B, remove the screw (10-32) that secures the top cover

ground lead to the rear cabinet frame (Figure 4-3).
6a.

Use a slot head screwdriver to release the two captive screws that secure the rear of the top
cover to the cabinet.

6b.

Raise the rear of the top cover to release the pins from the spring latch at the front of the
COVer.

4-5

NN
Juluyuy

WjTTTTT

J[Riajnjuinie

WTTTWET

JUULULL

'1—1'1'1'1[1

Juduyul

_ELLLELL
1NANan

TK-3458

Figure 4-3

Mounting Box Release Lever, System Cabinet

LEFT COVER
BRACKET

RIGHT

COVER BRACKET

SCREWS
(10-32)

2 PLACES

(EACH SIDE)

TK 4326

Figure 4-4

Top Cover Mounting (Type A)

4-6

CABINET
1

COVER

FRONT

CABINET
TOP COVER

DOOR

CAPTIVE

SCREWS

|| GROUND
LEAD

M4 SCREW
(10-32)
i

TK-5639

Figure 4-5

6c¢.

Top Cover Mounting (Type B)

Remove the top cover.

Disconnect the UNIBUS and the 1/O cable connectors attached to the modules within the
unit,
At the rear of the BA11-A box, remove and retain the two 1/4 inch nuts that secure the cable
clamp bar to the power supply (Figure 4-6).
Remove the cables from the cable troughin the BA11-A box and feed the cables toward the
rear of the cabinet and away from the mounting box.
10.
11.

If the release mechanism is type A, release the latch and raise the front of the mounting box.
If the release mechanism is type B, locate the left and right slide latches on the angle brackets
attached to each side of the BA11-A unit (Figure 4-7).

11a.

Slide the latches in the direction shown to release the latch from the holding pin.

4-7

TK-5728

Figure 4-6

12.

BA11-A Unit Cable Clamps

Raise the front of the mounting box to the maintenance position and raise the safety lever to
hold the mounting box (Figure 4-8).
WARNING

When the gas springs are removed, the safety lever
can not support the weight of the BA11-A mounting
box. The box should be supported by a field service
person while servicing is continued.
13.

14.

Remove the retaining clip from the piston ball connectors of the gas spring on the left and
right interface bracket (Figure 4-9). Use needle-nose pliers to facilitate the clip removal.
Remove the retaining clip from the body ball connector of the gas spring on the right side of
the cabinet.

15.

Support the mounting box.

16.

Remove the ball connectors from the studs on the right side of the cabinet by inserting a
screwdriver blade between the ball connector and the ball stud mounting surface.

17.

Remove the ball connectors from the studs on the left side of the cabinet using the procedure
described in step 15.

18.

At the rear of the cabinet, remove the four (10-32) screws and washers that secure the pivot
bracket to the cabinet frame on the left and right side of the cabmet (Flgure 4-9). These
screws can not be reached once the boxis lowered.

4-8

LEFT

SLIDE LATCH

HOLDING

BA11-A UNIT

{

RIGHT

SLIDE LATCH

FRONT

TK-5638

Figure 4-7

BAI11-A Type B Box Slide Latch Locations

4-9

BA11-AA, —AB
MOUNTING BOX
RIGHT GAS
SPRING

> Bt

/// ’

N
AN

SAFETY
LEVER

‘

TK-4397

Figure 4-8

19.

System Cabinet Safety Lever

At the front of the cabinet, while supporting the weight of the box, release the safety lever
and lower the mounting box to its normal position (Figure 4-8).
CAUTION

When the gas springs have been removed, the mounting box is not properly supported.

20.

At the rear of the cabinet, remove and retain the two (10-32) screws and washers on the left
and right side of the cabinet that secure the pivot bracket to the mounting box (Figure 4-9).

21.

Grasp the bottom of the mounting box at the front and rear and gently slide the box toward
the front of the cabinet. Lift the back of the mounting box and slide the box forward and
away from the cabinet frame.

CAUTION

Removal of the mounting box requires two people
due to its weight, one person lifting from the left side
and one person lifting from the right side of the cabinet.

4-10

SCREWS

BAT1-AA, —AB

—

MOUNTING BOX

(10-32)
2 PLACES

(EACH SIDE)

MOUNTING

BRACKET

'“—_fl:,#

SCREWS

(10-32)

LEFT

\H\r“—fl
®
T—_'mly

2 PLACES

L~ INTERFACE

BRACKET

(EACH S!DE)/\A-

LEFT

_ GAS
SPRING

RIGHT

PIVOT

BRACKET
PISTON
BALL

CONNECTOR

RETAINER

CLIP

PISTON
ROD

BODY BALL

CONNECTOR

(NOT SHOWN)\
TK-3469

Figure 4-9

System Cabinet, Mounting Box Hardware

4.2.1.2 Interface Bracket Removal/Installation - If the mounting box to be installed does not have the
interface and pivot bracket mounted on each side, remove the brackets from the box to be replaced
and install, using the following procedures.
1.

Using a 1/2-inch open or box-end wrench, remove and retain the two (5/16 - 24) bolts and

the (5/16 - 24) ball stud located on the interface brackets at the left and right side of the
mounting box (Figure 4-10).
Remove the two bracket assemblies and, using the hardware previously removed, install on
the left and right side of the replacement mounting box. Do not tighten bolts.

Align the top of the interface brackets to be parallel with the top of the mounting box and at
the dimension shown in Figure 4-10.

Tighten the two (5/16 - 24) bolts and the ball studs at each interface bracket.

PIVOT

BRACKET
\

11.18 CM

(.44 IN) ‘l

INTERFACE

}RACKET
j

BOLTS

(5/16-24)

/2 PLACES
/

BALL (5/16 — 24)

STUD

N\
BA11-AA, —AB

MOUNTING BOX

(LEFT SIDE)
TK 4398

Figure 4-10

Interface Bracket Mounting

4.2.1.3

Mecunting Box Replacement — To install the BA11-A mounting box into the PDP-11X44, or
similar system cabinet, perform the following procedures.
1.

Grasp the bottom of the mounting box at the front and rear and position the box on the
support rails with the front of the unit extending away from the front of the system cabinet.

CAUTION
Installation of the mounting box requires two people
due to its weight, one person lifting from the left side
and one person lifting from the right side of the cabinet.

4-12

Slide the mounting box toward the rear of the unit while lifting the rear of the box to clear
the ball stud.

At the rear of the cabinet, install the two (10-32) screws and washers removed in step 20 of
Paragraph 4.2.1.1 in the angle part of the left and right pivot bracket (Figure 4-9). Do not
tighten the screws.
WARNING

When the gas springs are removed, the safety lever
can not support the weight of the BA11-A mounting
box. The box should be supported by a field service
person while servicing is continued.

Raise the front of the mounting box to the position shown in Figure 4-8 and raise the safety
lever to hold the mounting box in position.

Replace the two (10-32) pivot bracket screws and washers, removed in step 18 of Paragraph

4.2.1.1 into the ieft and right cabinet frame (Figure 4-9).
NOTE

It may be necessary to shift the position of the
mounting box in a direction that will cause the holes
of the interface bracket to be properly aligned with
cabinet frame holes.
Tighten the screws installed in step 5.

Replace both gas springs removed in Paragraph 4.2.1.1 by snapping the lower ball connectors on first and then the upper ball connectors.

Install the four retaining clips removed in Paragraph 4.2.1.1.

Release the safety lever and lower the mounting box to its normal operating position.
10.

If the release mechanism is type A (see Paragraph 4.2.1), the latch will engage when the front
of the unit is in the normal operating position.

11.

If the release mechanism is type B, press down on the front of the unit and push the slide
latches, released in step 11b of Paragraph 4.2.1.1, forward to engage the holding pins.

12.

Route the cables removed in step 9 of Paragraph 4.2.1.1 through the cable trough.

13.

Insert the cable connectors removed in step 11 of Paragraph 4.2.1.1. into the modules.
Install the cable clamp removed in step 18 of Paragraph 4.2.1.1.

4-13

if the release mechanism is type A, perform steps 5 through 5b of Paragraph 4.2.1.1.
Install the top cover assembly onto the mounting box and tighten the screws that were

loosened in step 5d of Paragraph 4.2.1.1.
Lower the front of the unit to its normal operating position until the latch engages.
Replace the top cover of the cabinet, with the type B mechanism, by inserting the pins
located at the front of the top cover into the spring latches (Figure 4-5).

Lower the rear of the top cover and fasten the captive screws released in step 6b of Paragraph 4.2.1.1.
Attach the ground lead removed in step 6a of Paragraph 4.2.1.1.
Replace the BA11-A power cord plug into the unswitched receptacle of the power controller
unit.
18.

19.

Set the circuit breaker of the power controller-unit to the ON (1) position.

Close the rear door of the cabinet and set the door fastener, using a 3.9 mm (5/32 in)
wrench, so the door is locked.

4.2.2

BA11-A Mounting Box on Slides
When replacing a BA11-A mounting box that is installed on slides, the index plates attached to the side

of the box may be removed and installed onto the replacement unit.

4.2.2.1

BAI11-A Slide Mounting Unit Removal - To remove the mounting box, perform the following

procedures.
I.

Remove the ac power from the power controller by setting the ac circuit breaker to the OFF

(0) position (Figure 2-7).
2.

Remove the BAT1-A ac power cord plug from the unswitched receptacle of the power con-

troller.
3.

Cutor release the fasteners or clamps used to secure the ac power cord to the cabinet frame.

At the rear of the BAlI-A mounting box, remove the cable clamp bars that secure the
external cables to the unit. Each clamp is held by two 1/4 inch nuts (Figure 4-6).

Insert a small screwdriver blade into the slot in the top right side ofthe front bezel (Figure 4).

4-14

Release the latch that holds the mounting box by sliding the screwdriver to the left (Figure 411).

the front of the mounting box until it is fully extended and the slide hold levers are
engaged (Figure 4-12).
D1
1

ul 1

Remove and retain the four (6-32) screws that secure the top cover to the mounting box.

Remove the UNIBUS cable connector from the backplane, the [/O cables attached to the
console interface module (M7090), and all other cable connectors in the modules.

Route the cables away from the mounting box.

12.

Remove and retain the three (8-32) screws that attach the left and right index plate to the
slide assembly (Figure 4-13).
""""" he mounting box from the slides by lifting the unit until the alignment tabs on the
index plates are free from the slide mounting bracket.

10.

|98)

Remove the top cover.

CAUTION
Removal of the mounting box requires two people
due to its weight, one person lifting from the left side
and one person lifting from the right side of the cabinet.

)

|
i

RELEASE

DIRECTION

:::;
o R

b L]

1NN

iinianininialn
:::::::i
_L_u_k_——__l

TK-3458

Figure 4-11

Mounting Box Release Lever Slide Mounted Unit

4-15

CABINET RAIL \

/—— BAT1-AA, ~AB UNIT

PAWL RETRACTOR

]

=2
|

crd

SLIDE
_/
HOLD

SINGLE

t EVER

CHANNEL

SLIDE
/— BAT1-AA —AB UNIT

CABINET RAIL

4
PAWL RETRACTOR

LIl

«
\

SLIDE HOLD-/
LEVER

DOUBLE CHANNEL—/

SLIDE

TK-4393

Figure 4-12

Slide Hold Levers

4-16

8—32 SCREWS

(3 PLACES)

\\\

r//////w
_

INDEX

ALIGNMENT

PLATE

SLIDE

TAB

MOUNTING
BRACKET

TK-3486

Figure 4-13 Slide to Index Plate Mounting

4-17

4.2.2.2 Index Plate Installation - If the mounting box to be installed does not contain a left and right
index plate, the index plates must be removed and replaced.
1.

Remove and retain the pivot screws that secure the left and right index plate to the side of
the mounting box (Figure 4-14).

Remove the index plates.

Position the right index plate on the pawl. The index plate tab will protrude away from the
mounting box.

Insert the pivot screw and tighten.

Perform steps 3 and 4, using the left index plate.

Ensure that the index plate rotates freely when the pawl retractor is released.

RIGHT INDEX

PLATE

PAWL

/— PIVOT SCREW

- TAB
(-

o PAWL

RETRACTOR

RIGHT SIDE VIEW

PIVOT SCREW
LEFT INDEX

PLATE

PAWL

i
TAB

PAWL

BA11—-AA, —AB MOUNTING BOX

RETRACTOR

LEFT SIDE VIEW
TK-4392

Figure 4-14

Index Plate Mounting

4-18

4.2.2.3 BA11-A Slide Mounting Unit, Replacement
- To|install the mounting box to the slides, perform the following procedures.
1

Extend the ieft and right slide channei to their maximum position at the front of the cabinet.
When fully extended, the slide hold lever will be engaged (Figure 4-12).

Carefully lift the mounting box over and above the extended slides and set the index plate
over the slide mounting bracket on each side of the box (Figure 4-13). The index plate
alignment tabs will engage the sides of the slide mounting bracket.
NOTE
When the slides are fully extended, it may be neces-

sary to force the ends of the slides in toward the sides
of the mounting box during installation.
Insert three (8-32) screws through the left index plate tab and into the threaded holes of the
slide mounting bracket. Tighten the screws.

Perform step 3 for the right index piate.
Replace the cables that were removed in step 10 of Paragraph 4.2.2.1.
Replace the top cover that was removed in step 9, using the hardware removed in step 8 of
Paragraph 4.2.2.1.

Replace the caBle clamp bars that were removed in step 4 of Paragraph 4.2.2.1.
Replace the fasteners or clamps that were removed in step 3 of Paragraph 4.2.2.1.
Install the power cord plug that was removed in step 2 of Paragraph 4.2.2.1.
10.

Set the ac circuit breaker on the power controller to the ON (1) position.

11.

Release the slide hold levers on each slide channel and push the mounting box into the
cabinet until the latch engages (Figure 4-12).

4.2.3

Fan Assembly Removal and Replacement
The fan assembly is installed on the right side of the BA11-AA, -AB mounting box and can easily be

removed for servicing. The assembly contains three fans that can be individually removed and replaced. To remove and replace the assembly, perform the following procedures.
1.

In a system cabinet perform steps 1 and 2 of Paragraph 4.2.1.1.

If the release mechanism is type A (see Paragraph 4.2.1), perform steps 53, 5b, and 12 of
Paragraph 4.2.1.1.

2a.

If the release mechanism is type B, perform steps 6a through 6c, 11a, 11b and 12 of Paragraph 4.2.1.1.

If the BA11-A is slide mounted, perform steps 1 and 5 through 7 of Paragraph 4.2.2.1.
3a.

Release the pawl retractor on each side of the mountmg box (Figure 4-14) and tilt the box
90° to the maintenance position (Figure 4-15).

4-19

FRONT
|

)

RAIL

eoe/%000peope
e —

|
|

CABINET

BA11 MOUNTING BOX *

SCREWS

{(6-32)

2 PLACES

POWER

CONNECTOR
P1/01

SLIDE MOUNTED UNIT SHOWN.
FAN ASSEMBLY MOUNTED IN A

SIMILAR MANNER IN THE

PDP-11/X44 SYSTEM CABINET.

Figure 4-15

TK-43389

Fan Assembly Removal

Remove the two (6-32) screws that secure the fan assembly into the side of the box.
Slide the fan assembly away from the side of the box approximately 5 cm (2 in) and disconnect connector P1 from J1.

Continue to slide the assembly away from the box.

NOTE
Any of the three fans can be replaced by disconnecting the power plug on the fan and removing

the four (6-32) mounting screws that secure the fans
to the slide. Use only the specified replacement fan
and mount the new fan to the assembly, using the

hardware removed.

4-20

:*sl

To replace the fan assembly, slide this assembly into the side of the mounting box, replace

the plug removedin step 4 and the screws removedin step 3.
o0

In a system cabinet with a type A reiease mechanism, perform steps 12 and 13 of Paragraph
4.2.1.3.

8a.

In a system cabinet with a type B release mechanism, perform steps 12, 14, 19a and 19b of
Paragraph 4.2.1.3.

8b.

Perform steps

22 and 21 of paragraph 4.2.1.3.

Ifthe BA1l-A isslide mounted, release the pawl retractor (Figure 4-14) and tilt the box to its
normal operating position.

9a.
4.2.4

Perform steps 11 and 10 of Paragraph 4.2.2.3.
H7140 Power Supply Unit

The H7140 power supply unit is located at the rear of the BA11-A mounting box. To remove and
replace the unit, perform the procedures in the following paragraphs.

4.2.4.1

Power Supply Unit Removal - To remove the power supply, perform the following pro-

cedures.

In the system cabinet, perform steps 2 through 4 and 8 of Paragraph 4.2.1.1.

la.

If the release mechanism is type A (see Paragraph 4.2.1), perform steps 5a through 5f of
Paragraph 4.2.1.1.

1b.

If the release mechanism is type B, perform steps 6a through 6d, 11a and 11b of Paragraph
4.2.1.1.

If the BA11-A is slide mounted, perform steps 1 through 9 of Paragraph 4.2.2.1.

Remove the I/O and bus cables from the cable trough at the left side of the power supply
and route the cables over the top of the power supply.

Remove and retain the two (8-32) screws located in each of the two chassis angles at the rear
of the mounting box (Figure 4-16).

If the BA11-A is slide mounted, release the pawl retractor (Figure 4-14) on each side of the

Inthe system cabinet, raise the front of the mounting box to the position shownin Figure 4-

box and tilt the box 90° to the maintenance position (Figure 4-15).

8 and raise the safety lever to hold the mounting box in position.

Remove and retain the four (6-32) screws that secure the bottom cover to the mounting box
(Figure 4-17). Remove the cover.

Remove and retain the four (6-32) screws that secure the cover plate to the bottom of the
power supply assembly. Remove the cover.

Remove and retain the (10-32) screw that secures the ground lead to the ground bus (Figure
4-18).

4-21

=1
_____

[

SCREW

o1 " (832)

2 PLACES

L1
=

SCREW

(8-32)
2 PLACES

.
©

[]

L]
L]

M
L]
o
C
[}

o
|

TK-4400

Figure 4-16

Power Supply Unit, Rear Mounting Screws

BA11-A
MOUNTING BOX *
.

FRONT

——

(.’—'///

SCREWS (6-32)

BOTTOM COVER

e
e

RAIL
\

4 PLACES

S
p

POWER SUPPLY

SCREW (6-32)

4PLACES

a/s

LGN
.

CABINET

SCREWS

P32
ks
{(EACH SIDE)

——agp
*

NOTE:

SLIDE MOUNTED VERSION OF THE
BA11-A BOX IS SHOWN. THE
PDP-11/X44 SYSTEM CABINET
VERSION IS SiMILAR.
TK-4401

Figure 4-17

Power Supply Unit Removal

4-22

BEZEL PC BOARD

FRONT

PANEL

TU€38 RD

F_”i . (MS070)
CONSOLE
TERM
KD11-2Z
BACKPLANE

ARl

AO oNg

FAN AS0T

POWER

/—POWER FLEXPRINT CABLE

CABLE

/-GROUND FLEXPRINT CABLE

(J2 AND J3

/—+5V FLEXPRINT CABLE

NOT SHOWN)

GND

CABLE CONNECTOR

L 9.5 MM (3/8 IN)
2 PLACES

P1/J11
TK-3641

Figure 4-18

Mounting Box, Power Cable Connections

10.

Loosen the two 3/8in nuts on the clamp that holds the ground Flexprint cable to the ground
bus bar.

11.

Loosen the two 3/8in nuts on the clamp that holds the +5 V Flexprint cable to the +5V bus
bar.

12.

Slide the ground and +5 V Flexprint cables away from the clamps and bend up toward the
backplane.

13.

Remove the power Flexprint connector P1 from the power supply connector J11 and bend
up toward the backplane.

4-23

14.

Remove connector P3 of the CIM cable assembly from connector J1 of the power supply.

Move the tabs on each side of J1 outward, to release P3 (Figure 4-18).
15,

Remove the 3/8 in nut that secures the ground lead of connector P3 to the chassis ground
stud (Figure 4-19).
H7140-AA, -DA, -AB, -DB POWER SUPPLY UNIT

—_—

nr/

' @

/H—.

NUT

9.5 MM
{3/8 IN})

[

J1/P1

— ®
00000
[lcoocool] @
00000

7/]

[

®
.
00000
ll
00000

glw
p—/

\
J2

TK-4405

Figure 4-19

Power Distribution Panel Connectors
and Cable Assembly

16.

17.

If one or more additional backplanes are mounted in the box, remove the connectors attached to J2, J3 and J4 of the power distribution board. Remove the backplane connectors
from P2, P3, and P4 of the power distribution harness.

In a slide mounted installation, remove and retain the (8-32) screw located on each side of
the mounting box, toward the rear (Figure 4-17).

18.

18a.

In a system cabinet installation, remove the side panels of the cabinet.

Release the safety lever and lower the mounting box so that the (8-32) screws located on
each side of the mounting box toward the rear are accessible (Figure 4-17).

18b.

Remove and retain the two (8-32) screws described in step 18a.
CAUTION
The H7140 power supply assembly will tend to slide
forward when the screws in step 18 are removed.

4-24

Slide the power supply assembly forward approximately 5.0 cm (2.0 in) and disconnect the
fan assembly power cable shown in Figure 4-18 from connectors J2 and J3 (not shown) on
the power supply PC board.

Slide the power supply assembly from the mounting box and away from the cabinet.

Power Supply Unit Replacement

With the mounting box in the maintenance position, ensure that the [/O and bus cables will

not interfere with the power supply installation.

Slide the power supply into the mounting box chassis until it is approximately 5.0 cm (2.0 in)
¥ wil

Oul.}t}

from being completely in position (Figure 4-17).

Connect the fan assembly power cable terminals removed in step 19 of Paragraph 42.4.1.
In the system cabinet, replace the screws (8-32) removed in step 18a and 18b of Paragraph
4.24.1.
4a.

Raise the mounting box to the maintenance position and raise the safety lever (Figure 4-8).

4b.

Replace the side panels removed in step 18 of Paragraph 4.2.4.1.
If the BA11-A is slide mounted, replace the screws (8-32) removed in step 17.

Replace the backplane connectors removed in step 16 of Paragraph 4.2.4.1.
Replace the ground lead removed in step 15 of Paragraph 4.2.4.1.
Replace connector P3 removed in step 14 of Paragraph 4.2.4.1.

Replace the power Flexprint cable connector removed in step 13 of Paragraph 4.2.4.1.
10.

Replace the +5 V and ground Flexprint cables removed in steps 10 through 12 of Paragraph
4.24.1.

11.

Replace the ground lead removed in step 9 of Paragraph 4.2.4.1.

12.

Replace the cover plate removed in step 8 of Paragraph 4.2.4.1.

13.

Replace the bottom cover removed in step 7 of Paragraph 4.2.4.1.

14.

In the system cabinet, release the safety lever and lower the mounting box to the normal
operating position.

14a.

If the release mechanism is type A (see Paragraph 4.2.1), the latch will engage when the front
of the unit is pressed down.

14b.

If the release mechanism is type B, press down on the front of the box and push the slide
latches forward to engage with the holding pins on the left and right side of the mounting
box (Figure 4-5).

4-25

If the mounting box is installed on slides, release the pawl retractor and tilt the box to its
normal operating position (Figure 4-12).
16.

Replace the screws removed in step 4 of Paragraph 4.2.4.1.

17.

Replace the I/O and bus cables removed in step 3 of Paragraph 4.2.4.1.

18.

If the mounting box is installed on slides, install the top cover removed in steps 8 and 9 of
Paragraph 4.2.2.1.

18a.

Release the slide hold lever on each slide rail and push the mounting box into the cabinet
until the front latch engages (Figure 4-12).

19.
20.

Replace the cable clamp bar removed in step 8 of Paragraph 4.2.1.1.

In the system cabinet, if the release mechanism is type A (see Paragraph 4.2.1), replace the
top cover as described in steps 15a through 15¢ of Paragraph 4.2.1.3.

21.

In the system cabinet, if the release mechanism is type B, replace the top cover as described
in steps 16a through 16c¢ of Paragraph 4.2.1.3.

22.

In the system cabinet, connect the ac power as described in steps 17 through 19 of Paragraph
4.2.1.3.

23.

If the BA11-A unit is slide mounted, perform steps 9 and 10 of Paragraph 4.2.2.3.

4.2.5

CPU Backplane Assembly
The CPU backplane is mounted on the right side of the BA11-A mounting box. Perform the following
procedures to remove and replace the assembly.

4.2.5.1

Backplane Assembly Removal - Perform the following procedures to remove the backplane.

In the system cabinet, perform steps 1 through 3 of Paragraph 4.2.1.1 to remove the ac
power from the unit.

la.

If the release mechanism is type A (see Paragraph 4.2.1), perform steps 5a through 5f of
Paragraph 4.2.1.1 to remove the top cover of the cabinet.

1b.

If the release mechanism is type B, perform steps 6a through 6d of Paragraph 4.2.1.1 to
remove the top cover of the cabinet.

If the mounting box is installed on slides, perform steps 1 and 2 of Paragraph 4.2.2.1 to
remove the ac power.
2a.

Perform steps 5 through 9 of Paragraph 4.2.2.1 to remove the top cover of the mounting
box.
Remove the I/O and bus cables from the modules in the CPU backplane.
Remove the modules from the CPU backplane.

4-26

NOTE

Observe the module locations so that they can be replaced into the CPU backplane in the same positions.

In the system cabinet, if the release mechanism is type A, press the release lever and raise the
front of the mounting box.

In the system cabinet, if the release mechanism is type B, locate the left and right sliue
latches on the angle brackets attached to each side of the BAl1-A (Figure 4-7).

Slide the latches toward the rear of the unit to release the holding pins.

6a.

In tlre system cabinet, raise the front of the mounting box to the maintenance position and
raise the safety lever to hold the box in position.

If the mounting box is installed on slides, perform steps 5 through 7 of Paragraph 4.2.2.1.
Reiease the pawi retractor on each side of the mounting box and tiit the box to 90° to the
maintenance position.

Perform steps 7 through 13 of Paragraph 4.2.4.1.

Remove and retain four (8-32) screws used to secure the CPU backplane onto the mounting

10.

rails (Figure 4-20).

Remove the CPU backplane assembly.

11.

4.2.5.2

Backplane Assembly Replacement - Perform the following procedures to install the backplane

assembly.
1.

nstall the CPU backplane using the four (8-32) screws removed in step 10 of Paragraph
42.5 ‘

ia]

the screws.

In the system cabinet, release the safety lever and lower the front of the mounting box.
2a.

If the release mechanism is type A (see Paragraph 4.2.1), the latch will engage when the box
is in the normal operating position.

2b.

If the release mechanism is type B, press down on the front of the unit and slide the left and
right laiches toward the front to engage the holding pins (Figure 4-7).

If the mounting box is installed on slides, release the pawl retractors on each side and rotate
the box to the normal operating position (Figure 4-12).

Insert a hex-height module into the card guides that are aligned with the first and last slots at
each side of the backplane (Figure 4-21).
NOTE
The backplane assembly can be shifted in position to
enable the module connectors to be properly aligned
with the module slots.

4-27

14 SLOT—-COLUMN

CPU BACKPLANE

+5 FLEXPRINT

CABLE

3
)

GROUND FLEXPRINT

;

\.’; 0
—

”

CABLE
>

‘

=~ -3k~

9.5MM (3/8IN.)

; 2 PLACES

_NUT

NUT

9.5 MM (3/8 IN.)

2 PLACES

P1/J10

TK-5018

Figure 4-20

CPU Backplane Assembly Mounting

Raise the mounting box to the maintenance position as described in steps 5 or 6 and step 7 of

Paragraph 4.2.5.1.

Tighten the sérews (8-32) installed in step 1.
Replace the Flexprint cables and ground lead that was removed in steps 6 and 7.

Replace the cover plate and bottom cover of the mounting box that was removed in steps 8

and 7 of Paragraph 4.2.4.1.

Lower the mounting box to its normal operating position as described in steps 2, 2a, 2b or 3.
10.

Remove the hex-height modules used to align the backplane.

11.

Replace the modules that were removed in step 4 of Paragraph 4.5.4.1.

4-28

CABINET FRONT

;

i
1PN

J[Q

Qi?é%fi§
S

HEX MODULE

COMPONENT SIDE

REAR GUIDE

(BLACK)

SYSTEM UNIT

TK-4404

Figure 4-21

12.

Backplane Assembly Alignment

Replace the 1/0 and bus cables that were removed in step 3 of Paragraph 4.2.4.1.

In the system cabinet, perform steps 21 or 23 of Paragraph 4.2.4.2to replace the top cover of
the cabinet.
14.

If the mounting box is installed on slides, replace the top cover that was removed in step 2a.

15.

Restore the ac power to the unit that was removed in steps 1 and 2 of Paragraph 4.2.1.1.
4-29

4.3 POWER SUPPLY UNIT, COMPONENT LOCATIONS
The H7140-AA, -DA, -AB, -DB power supply contains an input assembly, three removable module

assemblies, and an output assembly as shown on Figure 4-22. The power supply also contains a mother
module and a power distribution module. Signals and voltages are distributed between the module
assemblies by the mother module. The power distribution module distributes the signals and voltages to
the backplanes.

?’
TOP COVER
|
===
|

MEMORY
INVERTER
MODULE

MEMORY
REGULATOR
MODULE

BIAS AND

INTERFACE

| TM~

MODULE

LOGIC
{7

INVERTER

MODULE

L0GIC

|INVERTER

INPUT

yr 151101
/li““".' amanes

| F

ASSEMBLY

CONTROL

MODULE

l%’OUTPUT
ASSEMBLY

YK-5013

Figure 4-22

H7140 Unit Module and Assembly Locations

4.3.1

Input Assembly

Figure 4-23 shows the components associated with the input assembly. This assembly is not removable

as a unit.

—_t

I I |N
I
l
.

)

[Ti
|

‘

I R
N1 O | I

) SN

_“H_"'H'“—lf_ni
A

| I

B I

| S

BRI

::_JL:JL____:I_:_J
W”r— "!'["

C2 (REAR)

)

@}:g;;

CR1

-//I’O

________

% %

L:/

N= BN = I
7N ==\l
G._///:-::
\

CB1

Input Assembly, Component Locations

Figure 4-23

4.3.2

F—r

]

Power Distribution Module

Figure 4-24 shows the components and connectors on the power distribution module. Connector P1 of the
power distribution cable assembly (DIGITAL No. 7016887) attaches connector J1 on this module. Figure

4-25 shows the cable assembly wiring.

(AT REAR)
Wil

J10

YTTYYYYYYY D 2 _____ !I

J2
TK-5012

Figure 4-24

Power Distribution Module Components

4-31

123456789

10111213]P1

'_l

[
1234lpa

123 4]p3

|1234|pr2

Z Q00

cxab

=2 00

G285

200

cxah

CABLE ASSEMBLY NO 7016887
TK-5008

Figure 4-25

Power Distribution Cable Assembly Wiring

4-32

APPENDIX A

BA11-AS/AT USER INFORMATION

NOTE

The material in this Appendix is VAX-11 specific.
A.1

GENERAL

The BA11-AS, -AT is mounted in a different cabinet (as those in Chapter 1) with slight modification in
mounting arrangements and cable rerouting. It also uses the H7140-DA, -DB power supply and the 877-B,
-D power controller. The following information outlines the option arrangements.
-

VAX-11/730-CA
CPU-AE

Power controller 877-D (120 Vac/24 A)
Battery backup H7750-BA (120 Vac/60 Hz)
Power supply H7140-DA (120 Vac)

VAX-11/730-CB
CPU-AF

Power controller 877-B (240 Vac/12 A)
Battery backup H7750-BD (240 Vac/50 Hz)
Power supply H7140-DB (240 Vac)

Installation, removal, and servicing for the BA11 and power supply are the same as described in Chapters
2, 3, and 4 except for the details of cable routing and BA11 cover removal. The 877-B, -D power controller
is addressed in Appendix B.

Figure A-1 shows a front view of the cabinet.

Figure A-2 shows the front view of the cabinet with the door open showing internal mounting
arrangements.

Figure A-3 shows a rear view of the cabinet with internal components exposed.
Figure A-4 shows the BA11 mounting box top cover.

Figure A-5 shows the cable routing and clamping arrangements.

Figure A-6 shows the routing of the power cable from the power controller board, mounted at the upper

left-hand corner of the cabinet, to the BA11 mounting box.
A.2

COVER AND DOOR REMOVAL

Cabinet Front Door

The front door is a hinged door. With a 5/32 inch Allen wrench, unlock the door using a 1/4-turn and
remove the grounding strap. Find the spring-loaded cam in the upper left-hand corner, turn the cam lock,
A-1

and release the locking pin. To free the door, swing the door out and up to remove the bottom pin from its
holder (Figure A-2).
BA11 Top Cover Removal
The cover is held down by four screws (Figure A-4). Remove both screws from one side and loosen the two
screws on the other side. Slide cover over until cover slots are free from screws.
Cabinet Rear Door
The rear door is a lift-out door. With a 5/32 inch Allen wrench, unlock the door using a 1/4-turn and
swing door out and up removing the bottom pins from their holder. The door should now be free.

A-2

MK-4930

Figure A-1

Mounting Box in System Cabinet

A-3

KEYSWITCH CONTROL
PANEL

TU58 FUSE

—
—_—

U\%(E‘]\/m

DOOR RELEASE

—

“'*-7;

T
Id

—

DT e

——

ITTMINE

ey I
W

fliim

MOUNTING

GROUND WIRE

877-8, -D
POWER CONTROLLER

Figure A-2

System Cabinet with Internal Components (Front View)

A-4

~—_
FRONT PANEL OF
877-8, -D

POWER CONTROLLER

MMMMMMM

Figure A-3

System Cabinet with Internal Components (Rear View)
A-5

Figure A-4

BA11l Mounting Box Top Cover

A-6

D= b
!

[ -

—

A~
Figure A-5

BA11 Cable Routing and Clamps

A-7

CONTROL PANEL ASSEMBLY

UPPER LEFT-HAND SIDE OF CABINET

BN TU58 POWER CABLE
CONTROL PANEL
POWER

—

TU58 POWER

CONTROL PANEL
POWER

CABLE

POWER FLEXPRINT

/ CABLE
1

GROUND FLEXPRINT

*dq

/CABLE

CZAC

/+5 V FLEXPRINT CABLE

FAN ASSEMBLY / °
POWER CABLE

P3/J1

Figure A-6

Mounting Box Power Cable Connections

A-8

GROUND LEAD

APPENDIX B

877-B, -D POWER CONTROLLER
REMOVAL AND REPLACEMENT

NOTE
The material in this Appendix is VAX-11 specific.

B.1 REMOVAL OF THE 877-B, -D POWER CONTROLLER
The 877-B, -D power controller is a bulkhead-mounted unit attached from its front panel by ten (10)
mounting screws (Figure B-1). The power controller is located in the lower left corner of the cabinet. The
877 controller is not a general-purpose controller but designed for the VAX-11/730-CA, -CB systems.

The following steps outline the removal procedure that should be followed.
1.

Remove all power by ensuring that the keyswitch on the control panel is in the OFF position.
Set the REMOTE/OFF/LOCAL switch to OFF and the main circuit breaker
on the power
controller to the OFF position (down). Disconnect the ac connector connected to the facility’s
power (Figure B-2).

Disconnect connector P2 (accessible through front of system cabinet) of the cable assembly to

connector J8 or J9 of the power controller (Figure B-3).

Disconnect ac connectors (accessible through front of system cabinet) from the switched and
unswitched receptacles on the back panel of the power controller (Figure B-3).
Remove the ten mounting screws and slide the power controller from the bulkhead rest (Figure
R-1)

B-1).

B.2 REPLACEMENT OF THE 877-B, -D POWER CONTROLLER
The following steps outline the replacement procedure that should be followed.
1.

Place the power controller into the bulkhead and replace the ten mounting screws securing the

controller to the bulkhead (Figure B-1).

Connect the ac connectors to the rear panel of the controller (Figure B-3). Connect the
processor to one of the four switched receptacles. The option H7750 is connected to one of the
two unswitched receptacles.

Attach connector P2 of cable assembly to J8 or J9 of the power controller.
Set the circuit breaker of the power controller to the ON (up) position.

Ensure that the REMOTE/OFF/LOCAL switch on the controller is in the REMOTE position

and the keyswitch is in the LOCAL position.

[CTE
(WY

K9]

CABINET /
BULKHEAD

877-8, -D

POWER CONTROLLER

MOUNTING SCREWS

(10) EACH

‘

J/
MK-4934

Figure B-1 877-B, -D Power Controller Mounting Arrangement

mm—

OFF

@LOCAL

POWER CONTROL BUS

TM~ POWER

iINDICATOR

TO FACILITY

AC POWER

MK-4827

Figure B-2

877-B, -D Power Controller (Front View)

B-3

(ooO 0O)

POWER CONTROL BUS

TO H7750

OPTION

TO BATTMOUNTING BOX
MK-4935

Figure B-3

877-B, -D Power Controller (Rear View)

B-4

B.3

877-B, -D POWER CONTROLLER FUNCTIONS

The 877-B, -D power controller unit controls and distributes the ac power to the units within the cabinet.
Figure B-4 is a simplified diagram of the components and circuits within the unit. The 877-B, -D provides
two dual-switched receptacles that can be remotely controlled, and one dual receptacle that is controlled
by the circuit breaker on the 877-B, -D.

877-B, -D POWER CONTROLLER UNIT

LOCAL/REMOTE
SWITCH
S

AC
CONTROL
L
BOARD
Al

INDICATOR
L1

«}SHUTDOWN
FILTER ~ |power reauesT

[
'

AC POWER

LINE

FILTER

CIRCUIT
SHEAKER

POWER

]

CONTROL

BUS

E$LAY
|

ONE DUAL
NONSWITCHED
AC RECEPTACLE

TWO DUAL
SWITCHED
RECEPTACLES

TK 5640

Figure B-4

877-B, -D Unit, Simplified Diagram

The unit includes a line filter FL1, a LOCAL/REMOTE control switch S1, and an ac indicator L1.

A power control bus connects the 877-B, -D unit to the BAll mounting box and to other units in the
system. Under normal operation, the LOCAL/REMOTE switch S! is set to the REMOTE position.
Application of ac power to the unit connected to the switched receptacles is controlled by the keyswitch on
the contol panel. When the switch is in the DC OFF position, the ac power is removed by the POWERREQUEST signal to the ac control board Al. In all other positions of the keyswitch, the ac power is
applied. When an overtemperature condition exists in a unit connected to the power control bus, the
SHUTDOWN signal to the ac control board A1 overrides the ac power from the switched receptacles of
the 877-B, -D unit.

When switch S1 is in the LOCAL position, the external power controller bus signals are disabled and the
ac power at all receptacles on the 877-B, -D is controlled only by circuit breaker CB1. See circuit
schematic for the complete internal wiring of the power controller unit.
B.4

POWER CHECKS

The 877-B, -D power controller unit has an AC indicator that is lit when ac power is applied. The
keyswitch panel has a DC ON indicator that is lit when the dc power is applied.
B.4.1

AC Power Distribution

The ac power in the BA11 system cabinet is distributed from the 877-B, -D power controller or a similar
power controller unit. The 877-B, -D unit contains two dual-switched ac receptacles and one dual
unswitched receptacle. The ac power to the switched receptacles is controlled by the
LOCAL/OFF/REMOTE switch on the 877-B, -D front panel or, if the LOCAL/OFF/REMOTE switch
is in the REMOTE position, by the keyswitch on the cabinet control panel.
B-5

Initial AC Power Checks
,
To check the ac power in the system, perform the following checks.
1.

Check that the ac indicator on the 877-B, -D unit is illuminated.

If the indicator is not lit, check the main ac power outlet.
If the indicator is lit, verify that the circuit breaker on the 877-B, -D is in the ON (up) position.
Check that the LOCAL/OFF/REMOTE switch on the controller is in the REMOTE position.
Ensure that the keyswitch on the control panel is in the LOCAL or LOC DSBL position.

If the above checks are acceptable, and ac power is still not applied, check for an overtemperature condition. This may be accomplished by removing connector P1 or P2 from the dc power
control bus of the controller (J8 or J9), and verifying by continuity testing that P1 pin 2 is

grounded (ground indicates overtemperature). If pin 2 is grounded and an overtemperature does
not exist, check for faulty units by disconnecting one unit at a time from the power control bus
cabling.

As a final check, set the LOCAL/REMOTE switch on the controller to the LOCAL position. If
the ac power comes on, it indicates a defective power controller.
B.4.2 DC Power Distribution
The dc voltages from the power supply are distributed to the CPU and extension backplanes. The DC ON
indicator on the keyswitch panel monitors the dc voltages and provides a visual indication of power failure.
Initial DC Power Checks

If a dc power failure is indicated, perform the following checks.
1.

Measure the +5 V CPU backplane and other voltages at the connector end of the flexprint
cable shown in Figure 4-1. Table 4-1 and 4-2 describe the signals found on the connector.

CAUTION
When measuring the +5 V bus voltage, do not short

the +5 V and the ground bus together.

If a dc voltage failure is found, remove and replace the power supply as shown in Chapter 4.

B-6

Reader’'s Comments

BA11-A Mounting Box and
Power System Technical Manual
EK-BAT1A-TM-003

(MK])

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