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Document:	BA11-K Mounting Box Manual
Order Number:	EK-BA11K-MM
Revision:	002
Pages:	70
Original Filename:

OCR Text

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EK-BA11K-MM-002

BA11-K mounting box

manual

digital equipment corporation - maynard. massachusetts

1st Edition, September 1974
2nd Edition, February 1975

Copyright © 1975 by Digital Equipment Corporation
The material in this manual is for informational
purposes and is subject to change without notice.
Digital Equipment Corporation assumes no respon-

sibility for any errors which may appear in this
manual.

Printed in U.S.A.

The following are trademarks of Digital Equipment
Corporation, Maynard, Massachusetts:
DEC

FLIP CHIP

DIGITAL
UNIBUS

PDP

FOCAL

COMPUTER LAB

CONTENTS

CHAPTER 1

BA11-K CHARACTERISTICS AND SPECIFICATIONS

1.1

GENERAL

1.2

PHYSICAL CHARACTERISTICS

. . . . .

1.2.1

BA11-K Characteristics

1.2.2

H765 Power System

1.3

. . . . . . . . e
e

. . . . . . . v« v i o e
. . . . . . . o o

ELECTRICAL SPECIFICATIONS

i e e

. . . . . . .

e e e e e e e e e

e e e e e e e e e e

e e

e
e

1.3.2

BA11-KE, BA11-KF Input Power Electrical Specifications
. . . . . ... .. .. ..
BA11-K Output Power Specifications
. . . . . .. .. .. ... ... ... .....

1.3.3

Power Up, Power Down Characteristics

1.3.1

. . . . . .. . ... ... .. ... .....

CHAPTER 2

SYSTEM UNITS, OPTIONS, HARNESSES, AND INSTALLATION INFORMATION

2.1

GENERAL

2.1.1

. . . . .

Introduction to System Units

e e

. . . . . . . . . ... Lo

2.1.2

BA11-K System Unit Configuration

2.1.3

Unibus Pin Assignments

. . . . . . . . . ..o

. . . .. . ... .. .. ... ... ... ....
e

2.1.4

System Unit Installation

. . . . . . . . .. . ... ...

e e e e e e

e
Lo

2.2

OPTION CONFIGURATIONS

2.3

COMPUTER OPTION AND MAIN POWER WIRE HARNESSES
. . . ... ... ... ..
. . . .. ... ... .. ... .....
POWER DISTRIBUTION WIRE COLORCODING

2.4

. . . . .

e e

2.6

UNIBUS AND COMMUNICATION CABLE ROUTING . . .. .. ... .. ... ... ..
. . .. . ... .. ... ... ..
CABINET AND SLIDE MOUNTING SPECIFICATIONS

CHAPTER 3

H765 POWER SYSTEM

2.5

3.1

INTRODUCTION

3.2

MECHANICAL DESCRIPTION

. . . . . o

e e e e e e e e e e
e
. . . . . . . . o

3.2.1

H744,H745, and H754 Regulators

3.2.2

5411086 Regulator

e e s e

e s e e s
e e e e e e e e e e

e
e
e

. . . . . . . . . . . . . . . . . .. ... ..

323

. . . . . . . . ..o
o
oo
L
7010014 Transformer Assembly . . . . . . . . .. .

3.2.4

7009811-1,-2 ACInputBox

3.2.5

1211714 Box Fan

3.2.6
3.3
3.4

. . . . . .. . .. .o
e
e
e e e e e e e

. . . . . . . . .

. . . . . . . . . . ...
5410864 Power DistributionBoard
e e o
e
. . . . . . . . . o o
SYSTEM FUNCTIONAL DESCRIPTION
. . . . . . . . e
SYSTEM CIRCUIT DESCRIPTION

ACINput BOX

3.4.2

Transformer Assembly

e e

. . . . o o e i

3.4.1
3.4.3

5411086 Regulator

. . . . . . . . . . L.
e e e e e
. . . . . . . . . ..

3.4.4

H744 +5 VRegulator

. . . . . . . . . . L

3.4.5

H745-15V Regulator

. . . . . . . . . .

3.4.6

H754 +20,-5 VRegulator

. . . . . . . . . . .

3.4.7

Power Distribution Board

. . . . . . . . . ...

CHAPTER 4

MAINTENANCE

4.1

MAINTENANCE EQUIPMENT REQUIRED

4.2

PREVENTIVE MAINTENANCE
General

4.2.2

Physical Checks

o i i i

. . . . ... .. .. . ... ... ... ...

e e
. . . . . . . . e
e e e e e e e e e e e e e e e e e e

. . . . .

4.2.1

. e

. . . . . . . . o .

e e e

CONTENTS (Cont)

4.3

4.3.1
4.3.2
4.3.3
4.3.4

e
e
e
e e
o
. . . . . . . . .
e
...
...
...
...
.
...
.
.
.
Isolation
Fault
System
Power
H765
e e e
. . . . . . e
Voltage Regulator Checks and Adjustments
. . . . . . . .. .. .. ...
Voltage Regulator Troubleshooting

MAINTENANCE PROCEDURE

434.1
43472

Output Short Circuit Tests

4.3.4.3

Testing a “Dead” Regulator

4.3.4.4

Testing a Voltage Regulator After Repairs

4.4.1

e e e

. . . . . . . . . . ... .

. . . . . . . . . .. ...
. . . . . .. .. ... ... ... ..

. . .. ... .. ...

H765 POWER SYSTEM SUBASSEMBLY REMOVAL PROCEDURE

Introduction

e e e

e e

. . . . . o o

Initial Tests

4.4

. . . . . . ... .. . ..

Regulator Bench Test Procedures (H744, H745,and H754)

. . . . . . . . . ..o e,

4.4.3

. . . .. .. .. ... ... ...
H765 Power System Access Procedure (Figure 4-4)
. . .. T
..
4-5)
(Figure
Removal
Regulator
H754
and
H744,H745,

444

AC Input Box and 5411086 Regulator Removal

4.4.5

. . . . . . . . .

442

Fan Removal

4.4.6

4.4.7

Power Distribution Board Removal

CHAPTER 5

UNPACKING AND INSTALLATION

5.1

INTRODUCTION

5.3

INSTALLATIONIN A CABINET

5.4.1

UNPACKING

5.4.2

e e T

. . .. ... .. ..... e

5.2
5.4

. . . . . .. .. ... e

. . . . . . . . . . ..o

Regulator Installation

. . . . .

. . . . . . ... ... ... .... e

Transformer Assembly Removal

4.4.8

. . . . . .. ... ... ... ...,

e e e

e e e
. . . ... ... ... ..... e
e e
e
o
.
.
.
.
.
.
.
.
CONNECTION
SUPPLY
ACPOWER
[
...
...
...
...
...
.
.
Vacor230Vac
115
Connectingto
Quality of ACPower Source

. . . . . . . o v v v i i vt

.. ... e e e e e e e
. . ...

e e

5.5

REMOTE POWER CONTROL

5.6

INSTALLATION CERTIFICATION

. . . . . . .

e e

ILLUSTRATIONS

Title

Figure No.

1-1

BA11K Physical Layout
1-3

. .. ....I

- BA11-K Mounting Box (Top Covers Removed)

. . . . . . . . . o . e

. . . . . . . .. .. o oo

Physical Layout of H765 Power Supply

2-1

Standard Unibus Connection . . . . . . . ... .. .. .. e

2-2

BB11 Single System Unit

2-3

System Unit Configurations

2-5

. . . . . . . . . . . .

Cable Routing

. . . . . . .

o 0 i

BA11-K and CPU Cabinet Mounting Specification

2-7

Accuride Slide Mounting Specification

3-1
3-2

BA11K with Double System Unit (Wire Wrap Side) . . . . . . . . . o

2-6

2-8

ee e

. . . . . . . . . . ...

e e

v oo

. . . . . . . .. .. . ... ... .. ..

. . . . . . . .. . . .. ..o
. . . . .. ... . ... ... e
Specification
Mounting
Slide
Chassis-Trak

e e e e e e
. . . . ... .. .. ... e
Power System Functional Block Diagtam
...
..
.
.
.
.
.
.
.
.
.
.
Diagram
Detailed
System
Power

ILLUSTRATIONS (Cont)
Title

Figure No.

Page

3.3

115 V Power Configuration

. . . . . . . . .. . ... .

230 V Power Configuration

. . . . . . . . . . . L L.

3.5

Power Control Simplified Diagram ".

3-6

5411086 Block Diagram

3.7

5411086 Regulator Waveforms

. . . . .. .. . ...

...

. . . . . . . . . . . ..o

35
36

. . . . . . . . . . . . ... oo

3-7

3-8

5411086 Power Up and Power Down

Voltage Regulator E1, Simplified Diagram

3-5

000, e ...

3.9

3-5

. . . . . . . .. .. .. ...

... .

...

. . . .. .. ... ... .. .. .. ....... 3-10

3.10

H744 Regulator WavefOorms

3.11

Power Distribution Board

. . . . . . . . . .. ... Lo 3-13

. . . . . . o v v vt i

. . . . . . . . . . . .. . . o

3-12

H744 Connection Diagram

4-1

H765 Fault Isolation Flowchart

Regulator Adjustments

4-3

Typical Voltage Regulator Output Waveforms

H765 Power System Access (Maintenance Position)

4-5

Regulator Removal

et e

e e e e
o

. . . . . . . . ... ...

e 3-11

o e 3-14
..

...

4-3

. . . . . . . . . . .. L. L e

. . . . . ... ... .. .. e

e e e e - 4-7

. . .. .. ... ... .. .. .

4-9

. . . . . . . . . . . . . e 4-10

4-6

H765 Power System

4-7

Fan Removal

. . . . . o o v i i i e e e e e e e e e e e e e e e e e e

4-8

Transformer Assembly

. . . . . . . . . .

e e

. . . . . . . . . . .. ..o e

Transformer Assembly Removal

4-10

Power Distribution Board

5.1

BA11-K Packaging

5.2

Connector Specifications

5.3

Power Control

e e e 4-11

e e

e 4-12

e e e e e e 4-13

. . . . . . . . . .. ... ...

. . . . . . . . . L

0oL 4-14

L oo 4-16

. . . . . . . . . . . . . e
. . . . . . . . . ..

. . . . . . . . .

L o

e e e e e e e e e

e e

e ...

5-2
5-3

TABLES
Title

Table No.
1-1

BA11-K Physical and Environmental Characteristics

1-2

H765 Power System Physical Characteristics

1-3

BA11-KE Input Power Electrical Specifications

. . . .. ... .. ... ... ... ....

1-4

. . . . . . . . . .. ... .. ... ..

. . ... ... .. e

e e

1-5

...

1-6

. . ... . . . ... .. ... ... .. e ...

1-4

BA11-KF Input Power Electrical Specifications

1-5

BA11-K Output Power Characteristics

1-6

Power Up and Power Down Characteristics

. . . . . . . . ... ... ... ...

2-1

Unibus Pin Assignments (By Pin Numbers)

. . . .. ...
.e

2-2

SU Installation Requirements

2-3

System Unit Combinations

2-4

PDP-11 Family Models and Options

2-5

PDP-11 Family Options

. . . . . . . . . ..

. . . . . . . . . . . . .. . .
. . . . . . . . . . .

. . . . . . . . . .

. o

. . . . . . . . o v v v i i v i

1-3
1-3

...

1-7

e e

2-4

e e

2-6

2-4

. oo

. . . . . . . . . . . .

2-7
2-8

2-6

Option Hamnesses

2-7

Power Distribution Wire Coding

4-1

Field Service Maintenance Equipment Required

.......................

4-1

4-2

Regulator Specifications

L Lo
e

4-4

4-3

H744,H745, H754 Voltage Regulator Troubleshooting Chart

. . . . . . . . . . ..

e e

. . . . . . . . . . o o it it

Page

e 2-10
Lo

. . . . . . .. ... .. ...

2-10

4-5

INTRODUCTION

This manual describes the general specifications, installa-

Chapter 2 describes the system unit configurations, options,

tion, theory of operation, and maintenance procedures that

and option guidelines applicable to the BA11-K.

apply to the BA11-K mounting box. The basic BA11-K

includes a 10-1/2 inch mounting chassis and power system

that is similar to the 11/05-S and 11/35-S chassis and power
system.

Chapter 3 contains a méchanical description of the BA11-K
and its contents, and describes the theory of operation.

This manual is also used for maintaining and

troubleshooting the PDP-11/05-S and PDP-11/35-S power

Chapter 4 describes the BA11-K power system maintenance

system. The manual is organized as follows:

procedures,

and the

replacement procedures for failed

items.
Chapter 1 describes the characteristics and specifications of

TRl i

the BA11-K.

Chapter 5 details unpacking and BA11-K installation.

7111-24

Fmir

Figure 1-1

BA11-K Mounting Box (Top Covers Removed)

CHAPTER 1
BA11-K CHARACTERISTICS
'AND SPECIFICATIONS

1.1

GENERAL

There are two basic versions of the mounting box: the

The BA11-K is a 10-1/2 inch expander box which is

BA11-KE for

mounted in a standard 19-inch rack. It is designed to house

These two variations are the result of two ac input boxes,

115 Vac, and the BA11-KF for 230 Vac.

the Digital standard system units that make up a PDP-11

one for each line voltage. The two ac input boxes can be

expansion system. The expansion system (expander box)

interchanged within the same BA11-K mounting box with

can contain memory, peripheral controllers,

no other modifications.

devices, or

options compatible with the PDP-11 family. The BA11-K is

1.2

modular in design enabling a high degree of serwceabflfl:y

1.2.1

with minimum downtime,

PHYSICAL CHARACTERISTICS
BA11-K Characteristics

Figure 1-1 shows the BA11-K mounted in a rack. Ba31ca11y

it is composed of a main chassis and an H765 power
The BA11-K can accept a maximum of five system units

system. The BA11-KE and BA11-KF are physically identi-

providing a great degree of flexibility in selecting a system

cal except for the ac input box in the H765. The BA11-KE

unit configuration (e.g., single and double system units may

(115 Vac)

be mixed).

BA11-KF (230 Vac) contains a 7009811-2 ac input box.

1-1

contains

7009811-1

input

box;

the

Figure 1-2 is the top view of the physical layout of the

enabling the H765 to be swung away from the main chassis

BA11-K. The mechanical and environmental specifications

during maintenance. The H765 power system contains five

are described in Table 1-1.

regulators,

two

fans,

input

box,

a transformer

assembly, and a power distribution board. Four of the
regulators are self-contained DEC standard modular types.
1.2.2

The fifth regulator is a regulator board that is mounted in

H765 Power System

The H765 power system is self-contained in its own chassis.

the ac input box. Paragraph 4.4 describes the removal

It is secured to the main BA11-K chassis with six screws.

procedures for the H765 power system. Table 1-2 lists the

Two are special-purpose screws which function as hinges,

H765 Power System’s physical characteristics.

H765 POWER

MAIN CHASSIS

MODULE GUIDES

\ POP PANEL

H765 POWER SYSTEM

CABLE CLAMP

MOUNTING
BRACKET
Top View - Main Chassis Cover Removed

rminr

Figure 1-2

BA11-K Physical Layout

SYSTEM COVER

7111-8

Table 1-1

BA11-K Physical and Environmental Characteristics
Description

ftem

Chassis size (with H765 power system and pop panel)

10.44 in. high, 17.12 in. wide, 26.53 in. deep

Chassis size (with H765 power system without console

10.44 in. high, 17.12 in. wide, 25 in. deep

panel and bezel)
10.44 in. high, 17.12 in. wide, 17.25 in. deep

Chassis size (without H765 power system, console
panel and bezel)

87 b

BA11-K expander box chassis weight (without system
units)
H765 power system size

10.38 in. high, 17.12 in. wide, 7.75 in. deep

Slide extension (three-section slide)

27 in. maximum

Slide weight capacity (BA11-K fully extended)

1501b

Three-stop slide

Positions: Horizontal, 45 degrees, and 90 degrees
(front panel facing up)

Fan air movement direction

Horizontally toward rear of BA11-K
22 maximum (2 double system units and 1 single

Module slots

system unit) using DEC standard configuration
backplanes

il4
!

Operating temperature range at inlet to box

41° F—122° F (5° C-50° C)

Operating humidity

10 to 95% (no condensation)

Cooling efficiency for both fans at 90 Vac, 50 Hz

Temperature rise no greater than 18° F (10° C)
from inlet air temperature to exhaust air

Table 1-2

H765 Power System Physical Characteristics
Description

Item

H765 power system contents

H744 regulators (two) (+5 V)
H745 regulator (-15 V)
H754 regulator (+20 V, -5 V)
5411086 regulator (+15 V)*
7010014 transformer assembly
7009811-1 or -2 ac input box with 5410993
power control board
5410864 power distribution board
1211714 box fans (two)

Fan size

6 in.

Fan type

Ball bearing

Fan capacity at 115V, 50 Hz

260 cfm at O static pressure

Fan efficiency at 90 Vac, 50 Hz

60%

7010014 transformer assembly weight

251b

*Early versions of the BA11-K may contain a 5409730-YA regulator in place of the 5411086 regulator.

1.3

ELECTRICAL SPECIFICATIONS

indicates that the input voltage is

115 Vac and that a

7009811-1 ac input box is installed in the H765 power

system.

1.3.1

BA11-KE, BA11-KF Input Power Electrical Specifi-

A BA11-KF expander box designation indicates

that the input voltage is 230 Vac and that a 7009811-2 ac

cations

input box is installed in the H765 power system. Tables 1-3

The BA11-KE and KF are electrically identical except for

and 1-4 contain the input power electrical specifications of

the ac input box. A BA11-KE expander box designation

the BA11-KE and KF, respectively.

Table 1-3
BA11-KE Input Power Electrical Specifications
Parameter

Specification

Input power

'90—132 Vac, 115 Vac nominal, 47—63 Hz, single phase

Inrush current

175 A peak for 10 ms max. at 115V line voltage

Input power

1200 W maximum at 115 V nominal line voltage

Input current

12 Amaxat 115 Vac

Circuit breaker rating

20 Aat 115 Vac

Power factor

The ratio of input power to apparent power must be greater than
0.85

Conducted Noise (noise on ac line)
Transients

Single transient without loss of data: 300 V at 0.2 W sec max.
Single transient, survival:

1000 V at 2.5 W sec max.

Average transient power survival: 0.5 W max.

CW Noise

10 KHz — 3 MHz: 3 V rms
3 MHz — 500 MHz:

1V rms

500 MHz — 1000 MHz: 0.5 V rms

RF field susceptibility

10 KHz — 1000 MHz: 1 V/M

Power fail

H765 power system is capable of withstanding power interruptions
of any magnitude and duration without damage. Storage time of

power supply at low line and full load shall be 20 ms minimum.
Storage time is measured from the time the power outage occurs

until the time the regulator voltages listed in Table 1-5 drop below

their specified regulation limits.

Table 14

BA11-KF Input Power Electrical Specifications
Specification

Parameter

Input power

180 — 264 Vac, 230 Vac nominal, 47—63 Hz, single phase

Inrush current

80 A peak for 10 ms max. at 230 Vac line voltage

Input power

1200 W maximum at 230 Vac nominal line voltage

Input current

6 A max at 230 Vac

Circuit breaker rating

10 A at 230 Vac

Power factor

The ratio of input power to apparent power shall be greater than
0.85

Conducted Noise (noise on ac line)
Transients

Single transient, without loss of data: 300 V at 0.2 W sec
Single transient, survival: 1000 V at 2.5 W sec max.
Average transient power survival: 0.5 W maximum

CW Noise

10 KHz —3 MHz: 3 V rms
3 MHz — 50 MHz: 1 V rms
500 MHz — 1000 MHz: 0.5 V rms

RF field susceptibility

10 KHz — 1000 MHz: 1 V/M

Power fail

H765 power system is capable of withstanding power interruptions

of any magnitude and duration without damage. Storage time of

power supply at low line and full load shall be 20 ms minimum.
Storage time is measured from the time the regulator voltages
listed in Table 1-5 drop below their specified regulation limits.

1-5

1.3.2

BAI11-K Output Power Specifications

great

The BA11-K ouiput power is determined by the rating of
the regulators (Figure 1-3) listed in Table 1-5. Due to the

FRONT OF
MOUNTING

BOX

degree

of {flexibility

and

options

available, each

BA11-K configuration must be analyzed for total load
requirements.

Once the current drain of the options is

TRANSFORMER

ASSEMBLY

REGULATOR # 3
H744
REGULATOR #4
H754

LOGIC
BACKPLANE

POWER DISTRIBUTION
BOARD

REGULATOR # 2

AC INPUT BOX
power control board and

H7 44

5411086 regulator

REGULATOR #1

are

internal to the ac input box

AIR VENTS

H745

Figure 1-3

Physical Layout of H765 Power Supply

Table 1-5
BA11-K Output Power Characteristics

Regulator

Voltage and Regulation

Output Current

Power Distribution

Peak-to-Peak Ripple

(max)

Board Jacks

(max)

H745 (No. 1)

-15 Vdc
£ 750 mV

10 A

J3,J5,17,19,J11

450 mV

H744 (No. 2)

+5 Vdc £ 250 mV

25 A

J9,J11

200 mV

H744 (No. 3)

+5 Vdc £ 250 mV

25 A

J3,7J5,17

200 mV

H754 (No.
4)

+20Vdc

8 A

J3,7J5,77,719,J11

5%*

5411086**

-5 Vdc £250 mV

1 A—8Af

+15Vdec£1.5V

4 A

5%%*
J3,7J5,J7,19,J11

J4,J6,38,310,J12

AC LO,DC LO LTCL
* At backplane. Typical ripple +3%.

**Early versions
of the BA11-K may contain a 5409730-Y
A regulator in place of the 5411086 regulator.

tMaximum -5 V current is dependent upon +20 V current. It is equal to 1 A plus the current of the +20 V supply, up to a total of 8§ A.

1-6

totaled, it should be compared with the output currents

1.3.3

listed in Table 1-5. (See Tables 2-4 and 2-5 for a list of
some of the available options and their load requirements.)
When configuring the expansion system, care must be taken
to ensure that the options do not exceed the current

The BA11-K power up and power down characteristics are

Power Up, Power Down Characteristics

3. Table 1-6 lists the dynamic and static power up and

capabilities of the regulators.

power down characteristics of regulator 5411086.

determined by regulator 5411086. A complete description

of this regulator, along with a timing diagram, is in Chapter

Table 1-6
Power Up and Power Down Characteristics

Parameter

Specification

Dynamic Performance (Figure 3-8)
BA11-K Power Down

4 ms min from ac Power Down to AC LO L asserted
5 ms min from AC LO L asserted to DC LO L asserted

BA11-K Power Up

1 ms min from +15 V to DC LO L negated
2 ms nominal from DC LO L negated to ACLO L
negated

Static Performance at full load*
-BA11-K Power Down

AC LO L drops to LOW: 83—88 Vac
DC LO L drops to LOW: 73—-78 Vac

BA11-K Power Up

DC LO L goes to HIGH: 75—80 Vac
AC LO L goes to HIGH: 85—-90 Vac

*Response to changing ac input (less than 10/V second).

CHAPTER 2

SYSTEM UNITS, OPTIONS, HARNESSES,
AND INSTALLATION INFORMATION
2.1

GENERAL

This

chapter

General Purpose
— General

purpose

system units use a

and expansion

standard backplane wiring which has been established for

capabilities of the BA11-K mounting box. The configura-

the controllers of small peripherals, such as printers, card

tion and expansion information should not only be used for
- initial installation, but also used as an ongoing aid when
adding or modifying system units. The following paragraphs

peripheral controller (SPC) slots with wiring provided for

details

the

configuration

readers, and terminals. Each system unit has four small

signal conditioning options. A variety of general purpose
interfaces, communications devices, and options are avail-

describe the items listed below:

able for use in these SPC slots.
DEC system units

BA11-K system unit configurations

Blank — Unwired single system units are made available for
OEM use, enabling custom application.

System unit installation

Option configurations

- 2.1.1

OR «—]

TERMINATOR

Introduction to System Units

|—

NNOD SNaINn

UNIBUS OUT

Cabinet mounting specifications

l
I

Cable routing

NNOD SNaiNn

Harness information

. :JNNIBUS
B

The system unit is the basic mounting assembly for PDP-11
logic. Logic module and cable connectors plug into the
module side of the system unit. The other side of the

system unit contains either backplane wiring or etched
board wiring which connects the pins together. A system

unit connects to another system via the Unibus. Four slots
of a system unit are reserved for Unibus connections. These
are slots A and B of the first and last slots as shown in
Figure 2-1.

The following types of system units are utilized in the

4 SLOT

BACKPLANE

(SINGLE SYSTEM UNIT)

PDP-11 system.

MODULE

SIDE
11-2758

Dedicated — Dedicated

system units

are

prewired

and

tested for specific functions such as processor, memory, or

Figure 2-1

~disk controller.

2-1

Standard Unibus Connection

The BB11 blank mounting panel (Figure 2-2) is a prewired

corresponding pins in slots A4 and B4. From this point, the

system unit (SU) designed for general interfacing. It is
prewired only for the Unibus and power. The unit contains

Unibus can be continued to the next unit by using an M920

or BCi1A. If the BB11 is the last unit on the bus, slot
A4-B4 accepts the M930 bus terminator module.

three 288-pin blocks assembled end-to-end in a casting

which can be mounted in the various PDP-11 assembly
units. Bus and power connectors, described below, use only
6 of the module slots, leaving 18 slots available for

The bus grant signals are wired through the BB11. These

grant signal wires must be removed and replaced with wires
to and from the user’s control circuits for the grant levels
used by the customer-supplied device.

customer use.

Power for +5V is distributed to all A2 pins; -15V is

The BB11 is wired to accept the Unibus in slots Al and B1.
This connection can be made with an M920 Unibus
connector or a BC11A Unibus cable assembly. All bus
signals, including grant signals, are wired directly to

distributed to all B2 pins except in slots Al, B1, A4, and
B4; and ground is maintained through the frame and power
connector on pins C2 and T1 of all slots.

UNIBUS CONN
POWER

RESERVED

UNIBUS CONN
i1-2741

Figure 2-2

BB11 Single System Unit

LmILn

2-2

2.1.2

BA11-K System Unit Configuration

Using DEC standard logic planes, the

BA11-K has the

following configuration capabilities (Figure 2-3).
1.

One double-system unit and three single-system
units. (A double system unit is a nine-slot logic

backplane.)

Five single-system units, 20 slots. (A system

unit is a four-slot logic backplane.)

Two double-system units and one single-system

unit.

MODULE

SLIDE

H765 POWER SYSTEM
_mm{m_

_.,?._fl

IR|

C :

::
!

iiEo

sl
t1
I
F
:
L H IR
s
SUS

SU4

SuU3

Su2 sui

DOUBLE SU

DOUL 3LE

If a single

system unit is installed in iocation SU{ a double

system unit cannot be installed in locations SU2 and

SU3

due to power distribution board layout.
1-2564

Figure 2-3

System Unit Configurations

2.1.3

2.1.4

Unibus Pin Assignments

System Unit Installation

The installation of a system unit (SU) requires the items

Table 2-1 lists the Unibus pin assignments for slots A and B
of a system umnit. These pin assignments are applicable
regardless of the type PDP-11 system unit selected.

listed in Table 2-2.

The following steps outline the procedure to be used when
installing a system unit.

Table 2-1
1.

Unibus Pin Assignments

(By Pin Numbers)

Pin
AAl

AA?2

Signal
INIT L

POWER (+5 V)

Pin
BA1

BA?2

Signal
BG 6 H

POWER (+5 V)

configuration.

BR5L

Figure 3-12 illustrates the correct connec-

AB1
AB2

INTRL
GROUND

BB1
BB2

BG5H
GROUND

AC2
AD1
AD?2
AFE1
AE?2
AF1
AF?2
AH1
AH?2
AJl
AJ2
AK1
AK?2
ALl
AL2
AM1
AM?2
AN1
AN?2
AP1
AP2
ARI1
AR2
AS1
AS?2
ATl
AT?2
AUI1
AU2
AV1
AV?2

GROUND
D02 L
D01 L
D04 L
D03 L
D06 L
D05 L
D08 L
D07 L
DI0OL
D09 L
D12 L
D11L
D14 L
D13 L
PAL
D15 L
GROUND
PB L
GROUND
BBSY L
GROUND
SACK L
GROUND
NPR L
GROUND
BR7L
NPG H
BR6 L
BG7H
GROUND

BC2
BD1
BD2
BE1
BE2
BF1
BE?2
BH1
BH2
BJ1
BJ2
BK1
BK?2
BL1
BL2
BM1
BM?2
BN1
BN2
BP1
BP2
BR1
BR2
BS1
BS2
BT1
BT2
BU1
BU?2
BV1
BV2

GROUND
GROUND
BR4 L
GROUND
BG4 H
ACLOL
DCLO L
AO1 L
AOO L
AO3 L
AO2 L
AO5L
AO4 L
AO7 L
AO6 L
AO9 L
AO8 L
All1L
AIOL
A13 L
A12 L
Al5L
Al4 L
A17L
Al6 L
GROUND
CiL
SSYN L
COL
MSYN L
GROUND

AC1

D00 L

BC1

Install the required number of system units in
the BA11-K and secure them to the mounting
boxes using the screws provided. The system
units are installed with slot A adjacent tc the
power distribution board. Figure 2-4 shows a
double system unit installed in a BA11-K box

NOTE

tions for the H744 regulator.

Install a Unibus jumper module (M920) from
the last slots A and B (see Figure 2-1) of the
first SU to adjacent SU slots A and B. This
extends the system Unibus continuity to each
logic backplane in the BA11-K.

The Unibus In should be connected to the first
siot (A1 and B1) of the first SU. The Unibus
Out should be connected to the last slot of the
last SU in the BA11-K.

Ensure that the M930 terminator module is

plugged into the last SU slot (slots A and B)
when terminating the Unibus.

Table 2-2

SU Installation Requirements
Quantity

Item

Backplane

Power harness

Remarks

See Tables 2-4 and 2-5.

M920 Unibus

Unless the SU is the first

jumper module

installed in a BA11-K
expansion box.

2-4

FRONT

SLOT PIN
LAYOUT
2
®

1
V

@V
U
@
T

S
@
®R

@®
P
@ N

@
M
®L

Esgake

SRFIPAE

RSO

K
@

SRS

et
Xeskiye
>

TIX
K

®y

SAOREE
e

ve
a

EILE ST

H
@

SRR

ESRRENCER LR

TR e

SIS

s \ V1IN
hddtadd

®F

E
@

®D
C
@

@B
A®
2

@®
1

ROW A

VIEW

FROM WIRE WRAP PIN SIDE.

COMPUTER IN MAINTENANCE POSITION

11-2735

Figure 224 BA11-K with Double System Unit (Wire Wrap Side)

2-5

Table 2-3 lists the various combinations of system units
that can be installed in the BA11-K.

2.2

OPTION CONFIGURATIONS

Utilizing two double system units, and one single system
unit, or a variation of these, the BA11-K can accept as

many as 16 hex and 6 quad module circuit boards. Due to
Table 2-3

System Unit Combinations

Variations

System Unit CombinationsTM

2 double system units and

the power that these system units could require, care must

be taken to assure that the power capabilities of the
BA11-K H765 power system, is not exceeded. To aid in a
safe, reliable module configuration Tables 2-4 and 2-5 have
been included in this section. These tables list the various

1 single system unit

DEC module or system unit options with its dc and ac
power requirements. Also included in Tables 2-4 and 2-5
are the power harness options,
if applicable.

3 single system units and
1 double system unit

5 single system units
NOTE

*Double system units are prewired DEC configurations.

Power harnesses used in other mounting boxes

may not be applicable to the BA11-K.

Table 24

PDP-11 Family Models and Options

Model/Option
H765 A/B

11/05-S

Description
BA11-K Power Supply

H744
H744
H745
H754
5411086

6.0

2 M930’s

2.5

Optional

KT11-D

KW11-L
SPC

M981
MF11-U (16K)
M930

Total Amperes

MF11-UP/MM11-UP

16K Sense

MF11-L (MM11-L)

8K Core

MF11-LP (MM11-LP)

8K Parity

(Active)
(Standby)

(Active)
(Standby)
(Active)
(Standby)

MMI11-S

+15V

AC Line Current

(Amperes)
2.5
2.5
2.5
3.3

4.4

0.51

4.4

0.51

8.6

4.4

0.51

6.0

6.1
54

4.4
0.56

0.51
041

2.2
0.8

7.3
5.4

4.4
0.56

0.51
0.41

2.3
0.8

0.25

16.6

0.05

5.0

Core Memory
(Double SU)
Core with Parity
(Double SU)

Memory
(Double SU)
Core Memory
(Double SU)

Same as MM11-L

Except in SU

3.0
0.5
2.5
0.5
2.0

1.25
6.1
1.25

34
1.7

6.0
0.5

1.8
0.3

4.9
1.7

6.0
0.5

2
0.3

Same as

MF11-L

*Non-Interleaved.

2-7

-5V

Configuration (1 SU)

+20V

2.0

KE11-F

16K Sense

-15V

10.5

KD11-A

MF11-U/MM11-U*

3 SPC

KE11-E
KJ11-A

(Active)
(Standby)

Current Needed (Amperes)

+5 V (Options)

8.0

KDI11-B

MM11-U

Total Amperes
11/35-S

+5 V (CPU)

Table 2-5

PDP-11 Family Options

Current Needed {Amperes)

AC Line

Power

Option

Mounting Code

AA11-D

1 SU

Description
Digital to Analog

Current

Harness

-15V

20V

-5V

15V

(Amperes)

7009562

3.0

0.3

N/A

5.0

0.5

Converter Subsystem

AR-11

SPC

ADC and DAC’s

BA614

(AA11-D)

D/A Converter

3.0

0.3

BM792-Y

SPC

Bootstrap Loader

0.3

CD11-A/B

1 SU

7010117

2.5

0.25

7010117

2.5

0.25

1.5

0.15

1.5

0.15

4.0

1000 CPM, 80 Col.
Card Reader Controller

CD11-E

1 SU

1200 CPM, 80 Col.
Card Reader Controller

CM11

SPC

200 CPM, 80 Col.
Card Reader Controller

CR11

SPC

300 CPM, 80 Col.
Card Reader Controller

DA11-DB

1 SU

Unibus Link

DA11-F

1 SU

Unibus Window

7010117

5.0

0.5

DB11-A*

1 SU

Bus Repeater

7009562

3.2

0.31

DC11-A

1 SU

Dual Clock and

7010117

0.2

0.02

System Unit

2.0

0.2

7010118

8.4

042

DC11-DA

(DC11-A)

Full Duplex Module Set

DD11-B

1 SU

Peripheral Mounting Panel

7010117

DH11-AA

DLB SU

Prog Async 16-Line

0.2

0.9

Multiplexer

DH11-AD

DLB SU

@ Modem Control

7010118

10.8

0.665

1.33

DI11-A

1 SU

Async 16-Line MUX

7010117

4.7

0.25

0.6

DJ11-AC

1 SU

Async 16-Line MUX

DLi1

SPC

Async Interface

DM11-B

(DH11)

16-Line Modem Control

(DH11)

0.24

DN11-A

1 SU

Auto Calling System Unit

7009562

2.6

2.5

DP11-D

1 SU

Half/Full Duplex Sync

7009562

2.56

DP11-C

(DP11-D)

1.0

1.8

0.07

0.25

016

0.04

0.21

0.28

Interface

Data/Sync Register

0.77

0.08

0.18

0.02

Extender

DP11-K

(DP11-D)

DQ11-D

1 SU

DQI11-E

1 SU

Internal DP11 Clock

Full/Half Duplex Sync

7010117

6.0

0.07

0.04

0.62

7010117

6.0

0.07

0.04

0.62

Interface

Full/Half Duplex Sync
Interface

*When installing a DB11-A bus repeater in a BA11-K 10-1/2 in. mounting box, the AC LO and DC LO wires must be removed from the harnesses of all the options (located
in the same box) after the DB11-A.

2-8

Table 2-5 (Cont)

PDP-11 Family Options

AC Line

Current Needed (Amperes)

Option

Mounting Code

Descriptien

DFC11-A

(DU/DP CLOCK)

Level Converter Clock

DQ11-K

(DQ11-D/A)

Crystal Clock

DRI11-B

SPC

General Purpose DMA

DR1 l-C

1 SU

DR11-K

Power

Harness

+5V

-15V

0.4

0.02

20V

-5V

Current

+15V

(Amperes)

0.02

0.05

Recovery

0.012

0.05

3.3

0.32

General Purpose

1.5

0.15

SPC

Digital I/O

N/A

0.15

DU11-D

SPC

Full/Half Duplex

2.2

2.5

0.05

0.27

DU11-EA

SPC

Sync Prog. Interface

2.6

0.20

0.07

0.33

DV11

DBL SU

Sync MUX

0.435

0.5

KG11-A

SPC

Comm Arith Unit

1.2

0.12

KW11-L

(CPU)

Line Clock

0.8

0.08

KW11-P

SPC

Prog Line Clk

1.0

0.1

LC11-A

SPC

LA30 Control

1.5

0.15

LP11-R

SPC

1200 LPM Printer

1.0

0.1

LP11-S

SPC

900 LPM Printer

1.0

0.1

IP11-W

SPC

240 LPM Printer

1.5

0.15

LP11-V

SPC

300 LPM Printer

1.5

0.15

LS11-A

SPC

60 LPM Printer

1.5

0.15

LV11-B

SPC

Electrostatic Printer,

1.5

0.15

MR11-DB

2 SPC

Bootstrap

PC11

SPC

Paper Tape

1.5

0.15

PR11

SPC

Paper Tape (Reader)

RH11

DBL SU

1.9

0.19

RK11-D

Disk and Cntil

8.0

0.8

TA11-A

SPC

Dual Cassette Interface

VTI11

Graphic Processor

6.5

VRI11-A

SPC

Push Button Box

7009562

Digital Interface

.083

13.5

0.6

500 LPM

7010115

2-9

100

0.8
0.4

2.3

COMPUTER

Table 2-7

OPTION AND MAIN POWER WIRE

Power Distribution Wire Coding

HARNESSES

Table 2-6 is a list of typical PDP-11 family wire harnesses.

DC Power/Signal

Color of Wire

Ground
Line clock (LTCL)

Black
Brown

Table 2-7 lists the standard colors used for dc power and

DC LO

Violet

signal distribution to the backplanes.

AC LO

Yellow

+5V

Red

-5V

Brown

2.4

POWER DISTRIBUTION WIRE COLOR CODING

+15V

Gray

-15V

Blue

+20V

Orange

Table 2-6
Option Harnesses

CPU Type
Option

11/35-S, 11/05-S
BA11-KE/F
10-1/2 in. Box

AA11-DA

70-9562

70-9562
70-10117
70-9562
70-9562
70-9562

70-9205
70-9099
70-9205
70-9205
70-9205

DD11-B
DH11-AA

70-10117
70-10118

AA11-DB
DA11-F
DB11-A
DC11-A
DD11-A

11/05, 11/10
BA11-D
10-1/2 in. Box

11/35
BA11-D
10-1/2 in. Box

70-9205

70-9205
70-9099
70-9205
70-9205
70-9205

70-8855
70-9162
70-8855
70-8855
70-8855

70-9099
N/A

70-9162
N/A

11/45
(Old)

70-8855

DH11-AB
DH11-AC
DJ11-AA
DJ11-AB
DI11-AC
DN11-AA
DP11-DA
DR11-B
MF11-L*
MF11-L**
MF11-LP*
MF11-LP**

70-10118
70-10118
70-10117
70-10117
70-10117
70-9562
70-9562
70-9562
N/A
70-10114
N/A
70-10114

N/A
N/A
70-9099
70-9099
70-9099
70-9205
70-9205
70-9205
70-9206
N/A
N/A
N/A

N/A
N/A
70-9099
70-5099
70-9099
70-9205
70-9205
70-9205
70-9206
N/A
70-9206
N/A

N/A
N/A
70-9162
70-9162
70-9162
70-8855
70-8855
70-8855
70-9242
N/A
70-9242
N/A

MM11-S
RH11

70-9562
70-9570

70-9205
70-9099

70-8855
70-9162

VT11
CD11 A/B,E
DQ11

70-10117
70-10117
70-10117

70-9099
70-9099
70-9099

MF11-Uk**
MF11-UP***

RH11-AB
RK11-D

70-10115
70-10115

70-10117
70-10116

11/40 only (1st MF11-L/LP)

11/40 only (2nd MF11-L/LP)

N/A
N/A

70-9099
70-8992

N/A
N/A

70-9099
70-8992

70-9099
70-9099
70-9099

*** MF11-U/UP cannot be mounted in old style 11/45 CPU box.
*xx*Jse 70-9177 if due to new module guide layout, 70-8909 cables are too short.

2-10

N/A
N/A

70-7162
70-8855

70-9162
70-9162
70-9162

11/40
H960D/E, BA11-F
(Old) ****

70-8909

11/40, 11/45
H960D/E, BA11-F
(New)

70-9562

70-8909
70-9099
70-8909
70-8909
70-9177

70-9562
70-9563
70-9562
70-9562
70-9562

70-9099
70-9466
70-9466
70-9466
70-9099
70-9099
70-9099
70-8909
70-8909
70-8909

70-9563
70-9561

70-8909

70-9103

70-9174
70-9103
70-9174

70-9561
70-9561
70-9563
70-9563
70-9563
70-9562
70-9562
70-9562
70-9565
70-9560
70-9565
70-9560

N/A
N/A

70-9535
70-9535

70-9099
70-8992

70-9563
70-9559

70-8909
70-9571

70-9099
70-9099
70-9099

70-9562
70-9570

70-9563
70-9563
70-9563

2.5 UNIBUS
ROUTING

AND

COMMUNICATION

CABLE
'

Figure 2-5 illustrates the routing of Unibus and communica-

tion cables in the BA11-K. The routing shown should be
used as a guide, taking the following rules into consideration.

Unibus cables should be kept separate from
other cables, if possible, to avoid cross talk.

Ensure that there is a layer of foam between
each Unibus cable when the Unibus cables are
|
stacked.

-4,

The maximum height of the cable or cables
routed through the BA11-K is 1/2 inches. This
is due to the room available under the top cover
and cable clamp.

Care should be exercised when routing {lat

cables to minimize blockage of the exhaust air
vents. These air vents are located in back of the
BA11-K on each side of the transformer assembly (Figure 1-3).

3/8 INCH

UNIBUS CABLES WITH

COMMUNICATION CABLES

FOAM BETWEEN CABLES

FLAT COMMUNICATION
CABLES

CABLE.CLAMP

BA11-K FRONT VIEW

7293-2

BA11-K SIDE VIEW

7293-3

Figure 2-5

Cable Routing

211

2.6

CABINET

AND

SLIDE

MOUNTING

SPECIFI-

location for mounting an Accuride or Chassis-Trak slide on

CATIONS

the front rail. Although the front rail slide placement is

The BA11-K and a 10-1/2 inch CPU can be mounted in a

identical for both slides, there are some mounting differ-

H950 cabinet. When using a H950 cabinet the standard

ences when fastening the slides to a chassis. Figures 2-7 and

configuration is- to place the CPU in location 3 and the

2-8 illustrate the specific slide mounting specifications for

BA11-K in location 2 (shown in Figure 2-6). The hole

Accuride and Chassis-Trak, respectively.

numbers shown on Figure 2-6, indicate the exact physical

B¢ fi

HOLE
NUMBERS
(

10t

HOLE LOCATION

Casmmn

BOX OR CPU |

80 B]

65
&S|

47|
ar
g{

CPU

K
¢
¢
]

|Io

.29
26

r—rd

NO.'S FOR SLIDE

MOUNTING 101/2"§

FRONT
T~ RAILS

(10 172" EACH
LOCATION)

BA11-K
)

H950
CABINET

[E}/SUDE\%J
:

a
1-2740

Figure 2-6

BAI11-K and CPU Cabinet Mounting Specification

2-12

DEC STANDARD 19" RACK
_[ 10x 32 x1/2 PHILLIPS HEAD SCREW

FRONT VIEW

10-32 TINNERMAN CLIP NUT

O TOP OFA STANDARD
FRONT PANEL

5/8" =
4

172"
6 _______ _7__7;__ —TIOl+..,

VY O

5/8"

Ol +

5/8

O +
5/8"

O
O
L

172"

_YL ________ .Q_

ol +

ol-I--

L—

—

SIDE VIEW

—

PIVOT POINT

OUTER SLIDE SECTION

BRACKET

’
|

]

_ kA

—

13/4

185/16”

FRONT RAIL OF MOUNTING CAB
|
y
I 1L

)

S| 101/2"

aa"x uwpes'| H
‘
sLot

+e
=11

--—-|

'1'

8 516"

VIEW

Y7 g

|of 4
e | ————|=
172"

REAR

FRONT PANEL

—_—

TR I

5, "
12 /16
le——

v %l|

1 3/4"

\\\

‘

{

27 174"

11-2737

Figure 2-7

Accuride Slide Mounting Specification

DEC STANDARD 19" RACK
_[ 10x 32 x1/2 PHILLIPS HEAD SCREW

O 00 0O O O

FRONT VIEW

10-32 TINNERMAN CLIP NUT

TOP OF A STANDARD

138

31 72"

172"

___.l._ =

/ |_FRONT _P_AEE_L_Z_TF__

Tll

78 O

5/8"

O +
———— =1
,1?

5/8"
+

OO0

s/8"

[

"
18 5/16
/

ol +172"
-=O +

]

5 /8"

REAR

VIEW

FRONT PANEL

43/8"

D 1T I

g 13/8" 102
ol-|--

‘

5/8" /f—
1/4"x 11/28"|
TM

18°/16

Lea

sLoT

)3
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H765

CHAPTER
3

POWER SYSTEM

3.1

3.2.2

INTRODUCTION

5411086 Regulator

The 5411086 regulator is contained on a printed circuit
board mounted within the ac input box. It is secured in

This chapter provides mechanical and functional descriptions of the H765 power system. A detailed electrical
interconnection diagram is included. The regulator circuits,

place when the ac input box is installed in the H765 power
system. The inputs and outputs of the regulator are

which are part of the H765 power system, are discussed in
detail.

terminated in two Mate-N-Lok connectors.

3.2

3.2.3 7010014 Transformer Assembly
This transformer assembly is located in the center of the

MECHANICAL DESCRIPTION

The H765 power system consists of two H744 regulators
(+5 V), a H745 regulator (=15 V), a H754 regulator (+20 V,
-5V), a 5411086 regulator (+15V), a 7010014
transformer assembly, a 7009811-1, -2 ac input box, a
5410864 power distribution board, and two 1211714 fans.
The contents of the power system are primarily housed in a

welded steel chassis.

H765 chassis. Two capacitors, two varistors, and two

terminal strips are mounted directly on the transformer.
The transformer base plate is used to bolt the transformer
to the chassis. The area around the transformer is open,
enabling ample air flow from the two fans across the
transformer. A thermistor is mounted directly to the

’

transformer frame, enabling over-temperature monitoring.

Output leads from the transformer, which go to other
modules, are terminated in Mate-N-Lok connectors. A cable

The chassis is rectangular and measures approximately
7-3/4 .in. long by 10-1/2 in. high by 17 in. wide. The H765
power system top cover is held in place by seven screws.
The main structural member contains cutouts and drill
holes which enable screws to be inserted for securing the
regulators, ac distribution box, transformer assembly, and
fans. Cutouts for the regulators allow the regulator ON
indicators to be monitored and the regulator output

clamp is used to secure these leads to the chassis.
3.2.4

supply chassis with three Phillips head screws. This enables
easy access to the ac line cord, circuit breaker, and remote
power control Mate-N-Lok. The 5410993 power control is

voltages to be adjusted.

3.2.1

physically mounted in the ac control box.
3.2.5

H744, H745, and H754 Regulators

three Phillips head screws. The mounting

screws pass through the H765 chassis holes and screw into

the regulator. A plastic (Lexon) shield is installed on the
component

side

of each regulator.

1211714 Box Fan

Two six-inch ball bearing fans, mounted in the chassis
between the module boards and regulators, are utilized in
the H765 power system. Each fan is secured to the chassis
with two screws. The screws of each fan are tightened to

These regulators are secured to the H765 power system

chassis with

7009811-1, -2 AC Input Box

The ac input box is mounted in the center of the power

10 in./1b maximum.

This permits visual

3.2.6

inspection of the regulator components once the regulator

5410864 Power Distribution Board

This power distribution board is a multilayer printed circuit
board containing 12 Mate-N-Lok connectors connected
directly to the board and four Mate-N-Loks connected to
flying leads. The power distribution board is grounded
using a ground tab which is connected to a flying lead. The
power distribution board is mounted on the rear of the
BA11-K chassis; four screws are used to fasten it in place.

is removed from the H765 chassis. The fuse, which is
located on the component side, is accessed by removing the
plastic shield. Each regulator contains one potentiometer,

except the H754, which contains two potentiometers. An
output indicator lamp is located next to the potentiometer.

The output of the regulators is terminated in a Mate-N-Lok
~ connector.

3-1

3.3

In the 230 Vac power configuration (Figure 3-4), the power

SYSTEM FUNCTIONAL DESCRIPTION

A functional block diagram of the power system is shown

transformer

in Figure 3-1. Assume that the line cord is plugged in and

capability of the ac input box is described in Paragraph 5.5.

windings

are

connected in

series.

Remote

the circuit breaker is on; line voltage is applied to the ac

input box. The ac input box contains a circuit breaker,

Utilizing the 115 Vac input box (7009811-1), the input line

relay, power control circuit, and regulator. The regulator,

voltage is applied via a 20 A circuit breaker (Figure 3-2) to

which is physically mounted in the ac input box, is

relay K2, and transformer T1 on the power control board.

functionally a separate assembly with its own part number.

Transformer T1 steps down the voltage to 24 Vac. The

The circuit breaker can be used as an ON/OFF switch (only
if pins 1 and 3 are shorted on the 3 pin connector) as well
as an overcurrent protection device. The relay and power

(Figure 3-5), the remote power switch contacts must be
closed. Energizing K1 completes the path to K2, switching

control circuit allows remote control of ac power to the

the 115 Vac to the transformer assembly. The normally

24 Vac is rectified and applied to relay K1. To energize K1

transformer assembly by means of a key switch or thermal

open thermal switch (TS1) (located in the transformer

switch, The 7010014 transformer assembly steps down the

assembly) closes when an over-temperature condition is

voltage from the ac input box to approximately 28 Vdc and

sensed. Closing TS1 applies 24 Vdc to half the K1 relay

routes it to H744, H745, H754, and 5411086 regulators. In

coil.

addition, the transformer assembly routes 115 Vac to box

deenergize. Deenergizing K1 interrupts the ac power to the

This creates two

opposing fields, causing K1

fans 1 and 2. The regulated dc outputs of the regulators are

transformer assembly. The varistor (D6 or D7) across the

applied to the power distribution board, where they are

coil (Figure 3-2) of K2 suppresses voltage spikes in excess
of 150 Vac for ac input box 7009811-1, and 275 Vac for ac

distributed to the various backplane connections.

input box 7009811-2.

3.4

SYSTEM CIRCUIT DESCRIPTION

This paragraph describes, in detail, the ac input box,

3.4.2

transformer assembly, regulators, and power distribution

The primary function of the transformer assembly is to step

Transformer Assembly

board. Figure 3-2 illustrates these circuits and their inter-

down the 115 Vac or 230 Vac input voltage, (Figure 3-2) to
28 Vac.

relationship.

There

are

five

separate secondary transformer

windings, one for each regulator.
3.4.1

AC Input Box

Connected across the primary of T1 are capacitors and

The 115 V (7009811-1) and 230V (7009811-2) ac input

varistors. The capacitors (C1, C2) are input line filters. The
varistors (D1, D2) suppress voltage spikes in excess of

boxes are functionally identical. They differ physically in
their components and in the way they are connected to the

transformer assembly. Figure 3-3 is a simplified schematic
of the 115 Vac power configuration. In this configuration,
the power transformer windings are connected in parallel.

150 Vac.

In addition, the transformer assembly routes

115 Vac

from

respectively.

3-2

TBl1

and TB2 to

box fans

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Power Distribution
2. J5,J7,49
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3|3

11-2543

Figure 3-2 Power System Detailed Diagram

TRANSFORMER ASSEMBLY

115V 7009811-1
AC

INPUT BOX
CBjY

BLACK

145V

GRN

L
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47-63HZ | |WHITE =

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11-2546

Transformer windings are connected in parallel to the input power.

115 V Power Configuration

Figure 3-3

TRANSFORMER ASSEMBLY

230V 7009811-2

AC INPUT BOX

CE!

JSIPS

313

112,34

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3,167,

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NOTE:

Transformer

windings are

connected in series to the input power.

Figure 3-4

230V Power Configuration

11-2545

54 -10993 AC POWER CONTROL BOARD

l FAST-ON TABS
11

TO 230VAC OR 115 VAC
RELAY

COIL K2

AC REFERENCE

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SWITCH (NC)

(OPTIONAL)
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NOTE:

THERMAL SWITCH AND KEY SWITCH ARE NOT PART OF
AC POWER

CONTROL

11-2547

BOARD

Figure 3-5

Power Control Simplified Diagram

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3.4.3

The output circuit is standard for most switching regulators

5411086 Regulator

and consists of free-wheeling diode D12 choke coil L1, and

The 5411086 regulator (Figure 3-6) circuit schematic is

~ shown on drawing D-CS-5411086-01. The following para-

output capacitor C3. These components make up the

graphs describe the regulator circuit, overvoltage crowbar

regulator output filter. Free-wheeling diode D12 is used to

circuit, AC LO and DC LO sensing circuit, AC LO, DC LO

clamp the emitter of Q7 to ground when Q7 shuts off,

drivers, and AC LO, DC LO indicators.

providing a discharge path for L1.

Regulator Circuit — The 20-30Vac input is full-wave
rectified by bridge D11 to provide dc voltage (25 to

45 Vdc, depending on line voltage and load on +15V)

In operation, Q7 is turned on and off, generating a square

across filter capacitor C1 and bleeder resistor R15. Operation centers on voltage regulator E1, which is configured as

wave of voltage that is applied across D12 at the input of

a positive switching regulator. A simplified schematic of E1
is shown in Figure 3-9. E1 is a monolithic integrated circuit
that is used as a voltage regulator. It consists of a
temperature-compensated reference amplifier, an error
amplifier series pass power transistor, and the output circuit
required to drive the external transistors. In addition to El,
the regulator circuit includes pass transistor Q7, predriver
Q4, and level shifter Q6. Zener diode D17 is used with R11

averaging device, and the square wave of voltage appears as

the LC filter (L1, and C10). Basically, this filter is an
an average voltage at the output terminal. By varying the
period of conduction of Q7, the output (average) voltage

may be varied or controlled, supplying regulation (Figure
3-7). The output voltage is sensed and fed back to El,
where it is compared with a fixed reference voltage. El
turns pass transistor Q7 on and off according to whether
the output voltage level approaches its upper and lower

limits (approximately +15.15 V and +14.85 V respectively).

to provide +15 V or El.

POWER
ON
|
I
|

Q7
OFF
|

Q7
O'N

|
|
+39V — ——|—

,
I

|
i
|

|
|

Q7 OFF
o 1515V

— —REGULATED
OUTPUT

+15V ——— J{— ———————
|
|
|
|

'
11-2709

LRI

Figure 3-7

5411086 Regulator Waveforms

During one full cycle of operation, the regulator operates as

+15 V Overvoltage Crowbar Circuit — The following com-

follows: Q7 is turned on and a high voltage (approximately

ponents comprise the overvoltage crowbar circuit: Zener

+30V) is applied across L1. If the output is already at a

diode D18, silicon-controlled rectifier (SCR) Q8, Q9, R38,

+15 V level, then a constant +15 V would be present across

R40, and C13. Under normal output voltage conditions, the

L.1. This constant dc voltage causes a linear ramp of current

trigger input to SCR D7 is at ground because the voltage

to build up through L1. At the same time, output capacitor

across zener diode D3 is less than 18 V. If the output

C10 absorbs this changing current, causing the output level

voltage becomes dangercusly high (above 18.0 V), diode

(+15 V at this point) to increase. When the output, which is

D18 conducts turning Q9 on, and the voltage drop across
R40 draws gate current and triggers the SCR. The SCR

monitcred by EIl, reaches approximately +15.15V, El

shuts off, turning Q7 off; the emitter of Q7 is then clamped

fires, short circuits the +15 V output to ground, and tumns
off E1 by shorting out the +15 V reference at D17.

to ground. L1 reverses polarity and discharges through D12

into capacitor C10, and the load. Predriver Q4 is used to
increase the effective gain of Q7, ensuring that Q7 can be
Line CLOCK QOutput — The CLOCK output is generated by

turned on and off in a relatively short period of time.

one leg of full-wave rectifier bridge D11, voltage divider
R22, and zener diode D19, The CLOCK output is a O to

Conversely, cnce Q7 is turned off and the output voltage

begins to decrease, a predetermined value of approximately

+3.9
V square wave, at the line frequency of the power

+14.85
V will be reached, causing E1 to turn on; El in

source (47 to 63 Hz). The CLOCK output is used to drive

turn, causes Q7 to conduct, beginning another cycle of

the KW11-L line frequency and KW11-P real time clock

operation.

options.

Thus, a ripple voltage is superimposed on the output and is

detected as predetermined maximum (+15.15 V) and mini-

AC LO and DC LO Sensing — The 20—30 Vac input from

mum (+14.85 V) values by E1. When +15.15 V is reached,

the secondary of transformer T1 is applied te the AC LO

El turns Q7 off; when +14.85V is reached, E1 tums Q7

and

on. This type of circuit action is called a ripple regulator.

D-CS8-5411086-0-1. The ac input is rectified by diodes D15

Overcurrent Regulator Circuit — The overcurrent regulator

common reference voltage is derived by zener diodes D13

sensing

circuits

shown

drawing

and D16, and filtered by capacitors C20 and C24. A
circuit functions as a current regulator when the current,

and

monitored at D11, exceeds 5 A. The current regulator

contains a differential amplifier and associated circuits. The

consists of R4, R5, R6, Q1, Q2, and D2. During normal

major difference is that the base of Q12 in the AC LO

operation

Q2 starts

circuit differential amplifier is at a slightly lower value than

conducting when the voltage drop across RS and R6

that of Q16 in the DC LO differential amplifier. The

and

Q2 are not conducting.

D14.

Both sensing circuits operate similarly; each

(sensed by D2) exceeds approximately 0.6 V. When Q2

operation of both sensing circuits depends on the voltage

conducts D1 becomes forward biased and E1 is shut off,

across capacitor C8. For AC LO and DC LO timing during

turning off the pass transistor Q7 and predriver Q4. The

power up and power down, refer to Figure 3-8.

conduction of Q2 will also turn on Q1 providing a constant

current source (1 mA) to the base of Q2. Q1 will hold Q2
on until the current through R5 and R6 drops below

AC LO and DC LO Driver — When an ac low condition is

approximately 4 A.

sensed, the output of differential amplifier Q12 turns off

With Q1 and zener D2 tied to the +15 V zener reference for

AC LO 1 and AC LO 2 signals (Figure 3-8). Approximately

Q19. Q19 in turn, gates on fets Q15 and Q18, generating

E1, the conduction of Q1 will hold E1 off, When Q1 and

7 ms after ac low is sensed, the dc low sensing circuit will

Q2 stop conducting, E1 will turn on, enabling the current

generate dc low. The dc low sensed output from differential

to exceed the regulator limits. With a continuous condition

amplifier Q16, turns off Q10. Q10 in turn gates on fets Q14

Q1 and Q2 will be turning on and off, causing the circuit to

and Q17, generating DC LO 1 and DC LO 2 signals (Figure

become a constant current regulator.

3-8).

3-8

AC POWER

(132V rms AC)

|
|

‘

FETS Q15 AND Q18

ARE TURNED ON

DC LOL

'LJ

;

I ms

—al e s

*r\\
|

"
e—4ms

LOL

+15V

i Minimum

oy
.
—+l le—2ms Nominal
AC POWER UP

AC POWER
DOWN

GENERATED WHEN

+15V

20ms

Max imum

--95V rms AC

OV- - ===~ |

!
|

AC LO L

l |

DC LOL

flh—"-.s.mfi-b;
]
tnimum
—| lke—1ms Minimum
1-2567

AC POWER DOWN

Figure 3-8

GENERATED WHEN

FETS Q14 AND Q17
ARE TURNED

1-2566

5411086 Power Up and Power Down

The +25 Vdc to +45 Vdc from rectifier D11 is applied to

Regulator

T1, Q3, and Q5. Q3 and Q5 due to their switching action

rectified by bridge D1 to provide dc voltage (24 to 40 Vdc,

Circuit — The

20-30 Vac

input

full-wave

creates a pulsating dc which is applied to the primary of

depending on line voltage) across filter capacitor C1 and

transformer T1. The output from the secondary of TI

bleeder resistor R1., Operation centers on voltage regulator

(approximately 15 V) is rectified by D6, D7, D8, and D9,

E1l, which is configured as a positive switching regulator. A

producing -10 Vdc to -15 Vdc. The -10 Vdc to =15 Vdc is

simplified schematic of E1 is shown in Figure 3-9. El is a

negative bias used to gate OFF J FETs Q15, Q18, Q14, and

monolithic

integrated

Q17 via Q19 and Q10. Unlike most transistors the negative

regulator.

bias is used to turn off the J FETs. The J FETs are turned

reference amplifier, an error amplifier series pass power

consists

circuit that is used as a voltage
of

temperature-compensated

on when there is zero volts between gate (G) and source (S)

transistor, and the

terminals.

external transistors. In addition to El, the regulator circuit

output circuit required to drive the

includes pass transistor Q2, predrivers Q3 and Q4, and level
shifter Q5. Zener diode D2 is used with Q5 and R2 to
provide +15 V for E1. Q5 is used as a level shifter; most of

AC LO and DC LO Indicators — Light-emitting diodes D20

the input voltage is absorbed across the collector-emitter of

and D21 are normally lit. When AC LO L and DC LO L are

Q5. This is necessary because the raw input voltage is well

asserted, the light-emitting diodes go off, indicating that

above that required for E1 operation. While this +15V

this regulator is the source of ACLO L or DC LO L on the

input is supplied, D2, Q5, and R2 retain the ability to

Unibus.

switch pass transistor Q2 on or off by drawing current
down through the emitter of Q5.

3.4.4

The output circuit is standard for most switching regulators

H744 +5 'V Regulator

Two H744 +5V regulators are used in the basic H765

and consists of free-wheeling diode D5, choke coil L1, and

power system. The H744 circuit schematic is shown in

output capacitors C8 and C9. These components make up

drawing D-CS-H744-0-1. The following paragraphs describe

the regulator output filter. Free-wheeling diode D5 is used

the

regulator

circuit,

overcurrent

sensing

circuit,

to clamp the emitter of Q2 to ground when Q2 shuts off,

and

providing a discharge path for L1.

overvoltage crowbar circuit.

3-9

FREQUENCY

V+

COMPENSATION

INVERTING
INPUT

SERIES PASS
TRANSISTOR

—o0 VOUuUT

7'y

NONINVERTING
INPUT

‘

<
\»

A - Voltage Reference Amplnfler
B-Error Amplifier

CURRENT CURRENT

C -Current Limifer

LIMIT

ENSE

Simplified Schematic

1 nc

Ne | 1

| FREQ COMP

CURR LIM | 2
CURR SENSE | 3

INV OUTPUT | 4

Vout

NON-INV OUTPUT | 5
Vref | 6

v-|

Pin Designations
11-1895

Figure 3-9 Voltage Regulator E1, Simplified Diagram

LELE

3-10

|
|

2
OFF

|
-

+39V — ——|-

4
:

:
|

oV
:

Q2 OFF

»5:05V

_ _REGULATED

‘
—
b —mm
FEV—

OUTPUT

|
|

11-0098

Figure 3-10 ‘H‘744 Regulator Waveforms

In operation, Q2 is turned on and off, generatmg a square

Thus, a ripple voltage is superimposed on the output andis

averaging device, and the square wave of voltage appears as

turns Q2 off; when +4.95 V is reached, E1 turns Q2 on.

wave of voltage that is applied across D5 at the input of the
LC filter (L1, C8 and C9). Basically, this filter is an

detected as predetermined maximum (+5.05 V) and minimum (+4.95 V) values by E1. When +5.05 V is reached, E1

an average voltage at the output terminal. By varying the
period of conduction of Q2, the output (average) voltage
may be varied or controlled, supplying regulation (Figure
3-10). The output voltage is sensed and fed back to El,
where it is compared with a fixed reference voltage. El

This type of circuit action is called a ripple regulator.

+5 V Overcurrent Sensing Circuit — The overcurrent sensing

circuit consists of Q1, R3 through R6, R25, R26, programmable unijunction Q7, and C4. Transistor Q1 is normally

turns pass transistor Q2 on and off, according to whether

not conducting; however, if the output exceeds 30 A, the
forward voltage across R4 is sufficient to turn Q1 on,
causing C4 to begin charging. When C4 reaches a value

the output voltage level decreases or increases. Defined
upperand lower 11m1ts for the output are approx1mately
+5.05 Vand +4.95 V.

equal to the voltage on the gate of Q7, Q7 turns on and E1

During one full cycle of operation, the regulator operates as

will be biased off, turning the pass transistor off. Thus, the
output voltage is decreased as required to ensure that the
output current is maintained below 35 A (approximately)
and that the regulator is short circuit protected. The
regulator continues to oscillate in this new mode until the
overload condition is removed. C4 then discharges untfl E1

follows: Q2 is turned on and a high voltage (approximately

+30 V) is applied across L1. If the output is already at a

+5 V level, then a constant +25 V would be present across

L1. This constant dc voltage causes a linear ramp of current

to build up through L1. At the same time, output
capacitors C8 and C9 absorb this changing current, causing

is allowed to turn on again and the cycle repeats.

the output level (+5 V at this point) to increase. When the
output, which is monitored by E1, reaches approximately
+5.05 V, E1 shuts off, turning Q2 off; the emitter of Q2 is

+5 V Overvoltage Crowbar Circuit — The following components comprise the overvoltage crowbar circuit: Zener
diode D3, silicon-controlled rectifier (SCR) D7, D8, R22,
R23, C7, and Q6. Under normal output voltage conditions,
the trigger input to SCR D7 is at ground because the
voltage across zener diode D3 is less than 5.1 V. If the

then clamped to ground. L1 discharges into capacitors C3,
C9, and the load. Predrivers Q3 and Q4 are used to increase
the effective gain of Q2, ensuring that Q2 can be turned on
and off in a relatively short period of time.

Conversely, once Q2 is turned off and the output voltage

output voltage becomes dangerously high (above 6.0 V),
diode D3 conducts, and the voltage drop across R23 draws

begins to decrease, a predetermined value of approximately
+4.95 V will be reached, causing E1 to turn on; E1 in turn,
causes Q2 to conduct, beginning another cycle of opera-

gate current and triggers the SCR. The SCR fires and short
circuits the +5 V output to ground.

tion.

3-11

3.4.5

H745-15V Regulator

the -5 V. The +20 V shunt regulator consists of transistors

Operation of the H745 is basically the same as that of the

Q4, Q10, and Q11; the -5 V shunt regulator consists of Q6

+5 V regulator (drawing D-CS-H745-0-1). Input power (20

and Q9. Q10 and Q9 are the pass transistors.

to 30 Vac) is taken from the transformer secondary and
input to full-wave bridge D1, whose output is a variable 24
to 40 Vdc input across capacitor C1 and resistor R1.

The output of the basic regulator is 25V (-5 to +20 V).
The shunt regulators are connected across this output, with

-15V Regulator Circuit— Regulator operation is almost

a tap to ground between pass transistors Q9 and Q10. The
voltage at the bases of Q6 and Q4 will vary with respect to

identical to that of the +5 V regulator; however, the +15 V

ground, depending on the relative amount of current drawn

input that is required for E1 operation is derived externally

from the +20V and -5 V outputs of the regulator. If the

and is input across capacitor C2 to +1, and the inverting

+20 'V current increases while the -5V current remains
- constant, the output voltage at the +20 V output will tend

and noninverting inputs to E1 are reversed. In addition, the
For

to go more negative with respect to ground; this will also

example, QS5, which is used as a ‘“level shifter,”” is an NPN

cause the -5V output to go more negative, since the
output of the basic regulator is a fixed 25 V. This change is

polarities

of the various components are reversed.

transistor on the +5 V regulator; a PNP is required on the

ground (at =15 V).

sensed at the bases of Q6 and Q4: Q6 will conduct, causing
Q9 to conduct also, increasing the current between -5 V

Under normal

and ground until the balance between the +20 V and the
~5 V is restored. At this time, neither Q6 nor Q4 will be

-15 'V regulator to allow the regulator to operate below

operating conditions, regulator operation

centers around linear regulator E1 and pass transistor Q2,

conducting. If the -5 V current increases, Q4 and Q10 will

which is controlled by El. Predetermined output voltage

conduct to balance the outputs.

limits are -14.85 V minimum and -15.15
V maximum.
When the output reaches -15.15V, E1 will shut off,

Overvoltage Crowbar Circuits — There are two crowbar
circuits in the H754: Q7 and its associated circuitry for the

turning Q2 off, and L1 discharges into C8 and C9. When
the output reaches -14.85 V, E1 will conduct, causing Q2

+20V, and Q12 and its circuitry for the -5 V. Either one

to turn on, thereby increasing the output voltage.

will trigger SCR D9.

-15 V Overcurrent Sensing Circuit — The -15V regulator

Overcurrent Sensing Circuit — The overcurrent circuit com-

overcurrent sensing circuit is basically made up of the same

prises Q1, Q8, Q13, Q14, and associated circuitry. The total

components used in the +5V regulator, except Q1 is an

peak current is sampled through R4. When the peak current
reaches approximately 14 A, Q1 turns on sufficiently to
establish a voltage across R7 and R38, firing Q8. This pulls

NPN transistor in the =15 V regulator. Q1 is normally not

conducting; however, once the output exceeds 15 A, Q1
will turn on and C3 will charge. When C3 reaches the same

the voltage on pin 4 of the 723 up above the reference
voltage on pin 5, shutting off Q2. D6 now conducts, and

value as the gate of Q7, E1 will be biased off, turning Q2

off, and thereby stopping current flow and turning the

the current through R37 turns on Q14, which turns on
Q13. This keeps Q8 on for a time which is determined by

~=15 V regulator off, Thus, the regulator is short circuit

protected.

the output voltage and L1. This action, in turn, allows the

=15V Overvoltage Crowbar Circuit — When SCR D5 is

off-time to increase as the overload current increases,
thereby changing the duty cycle in proportion to the load.

fired, the - 15 V output is pulled up to ground and latched

The output current is thus limited to approximately 10 A.

to ground until input power or the +15 V input is removed.

Voltage Adjustment — The +20V adjustment is located on

A negative slope on the +15V line can be used to trip the

the side of the H754; the -5 V potentiometer is on the top,

crowbar for power down sequencing, if desired.

next to the connector. To set the output voltages, power

3.4.6

down, disconnect the load, power up, and adjust for a 25 V

H754 +20, -5 V Regulator -

One H754

reading between the +20 and -5 V outputs with the 20 V

regulator is used in the basic H765 power

supply. The H754 circuit schematic is shown in drawing

potentiometer. Then set the -5 V between its output and

D-CS-H754-0-1.

regulator circuit, overvoltage crowbar circuits, overcurrent

ground. Power down, reconnect the load, power up, and
then check and adjust the outputs again. This procedure is

sensing circuits, and voltage adjustment procedure.

necessary because the +20 V potentiometer (R17) actually

Regular Circuit
— The circuit (schematic D-CS-H754-0-1)

sets the overall output of the regulator (25 V from +20 V
to -5V), while the -5V adjustment (R21) controls the

The

following

paragraphs

describe

the

has a voltage doubler input, but the output consists of two

-5V

shunt regulator circuits — one for the +20 V, the other for

D-CS-H754-0-1.)

I8l

3-12

ground

output.

(See

schematic

drawing

aNnoyo 'S

‘0l ION Pasn

pasn {ON ‘S |

‘9oNpasn9oNSN
|

]

AeGLl— AbS—

3.4.7

Power Distribution Board

5411086 Regulator: +15 Vdc output is routed via
the power distribution board etch to H745. The

The power distribution board (Figure 3-11) performs two
primary

functions:

It routes the transformer assembly

secondary output voltages to the regulators and routes the

+15 Vdc

also

routed

via

the

etch

15-pin

Mate-N-Loks J3, J5, J7, J9, and J11. 5411086 LTC,

dc outputs of the regulators to the backplane.

AC LO L, and DC LO L outputs are routed via the
etch to 6-pin Mate-N-Loks J4, J6, J8, J10, and J12.

Routing voltage

the

regulators is

accomplished via

Mate-N-Lok J1/P1 and an etch on the power distribution

board. Mate-N-Lok P1/J1 routes 28 Vdc from four separate

The dc and signal outputs of Mate-N-Loks J3 through J12

transformer secondaries to H745, H754, and both H744

are routed to the backplane via a power harness. Tables 2-4

regulators. The etch routes +15 Vdc from 5411086 regu-

and 2-5 list the power harnesses required for the appro-

lator to the H745 regulator.

priate option.

The regulator outputs are routed as follows:
H745 Regulator 1: -15 Vdc output is routed via the

power distribution board etch to 15-pin Mate-N-Loks

H744

J3,735,717,J9, and J11.

NO. 2

H744

Regulators

and

3: Regulator

15-pin

Mate-N-Loks

and

J11.

POWER

H744

regulator 3, +5 Vdc output is routed via the power

is that two H744 regulators cannot be connected in
Figure

3-12 is

DISTRIBUTION

GND +5V

BOARD

F_[JJ__Llf:lfllngDt‘_]JDEfi

distribution board etch to 15-pin Mate-N-Loks J3, J5,
and J7. A unique configuration of the power system
parallel.

NO. 3

+5V GND

+5 Vdc

output is routed via the power distribution board

etch

H744

Jtz

a simplified diagram illus-

Jit

Jio

trating the correct H744 to power distribution board
configuration.

NOTE:

Regulators

routed via

the

5411086

output voltages
11-2565

power distribution board etch to

15-pin Mate-N-Loks J3,J5,J7,J9, and J11.

Figure 3-12

3-14

AELE.

H745, H754, and

are common to MATE-N-LOKS J3, J5,J7,J9, and Jf1.

H754 Regulator 4: +20 Vdc and -5 Vdc outputs are

H744 Connection Diagram

CHAPTER 4
MAINTENANCE

BA11-K maintenance procedures are divided into two

maintenance. This chapter describes the equipmént and

categories: Preventive maintenance and corrective mainte-

procedures needed for performing corrective and preventive

nance.

Corrective maintenance

maintenance.

isolate

fault

should be performed to

malfunction and to make necessary

adjustments and/or replacements. Diagnostic programs that

4.1

test the functional units of the system and special calibra-

Maintenance

tion

standard equipment (or equivalent) listed in Table 4-1.

and

test

procedures

aid in

performing corrective

MAINTENANCE EQUIPMENT REQUIRED
procedures

for

the

BA11-K

require

Table 4-1
Field Service Maintenance Equipment Required

Equipment or Tool

Manufacturer

Model, Type, or Part No.

DEC Part No.

Oscilloscope

Tektronix

453 (or equivalent)

29-13510

—

29-13510

DVM

Volt/ohmeter (VOM)

Triplett

Diagonal cutters

Utica

47-4

Diagonal cutters

Utica

466-4 (modified)

Miniature needle-nose

Utica

29-13460
29-19551

234-1)2

pliers

29-13462

Wire strippers

Millers

101S

29-13467

Solder extractor

Solder Pullit

Standard

29-13451

Soldering iron (30 W)

Paragon

615

29-13452

Soldering iron tip-

Paragon

605

4-'1

29-19333

the

4.2

PREVENTIVE MAINTENANCE

Inspect the following for mechanical security:
Lamp or LED holder assemblies, jacks, con-

4.2.1

nectors,

General

Preventive maintenance consists of specific tasks performed

fans,

periodically to prevent failures caused by minor damage or

required.

switches,

capacitors,

power supply

etc.

Tighten

regulators,

replace as

progressive deterioration due to aging. A preventive mainte-

nance log book should be established and necessary entries

made according to a regular schedule. This data, compiled

Inspect

power

supply

capacitors for leaks,

bulges, or discoloration. Replace as required.

over an extended period of time, can be very useful in
anticipating possible component failure.
4.3

Preventive maintenance tasks consist of mechanical and
electrical checks. All maintenance schedules should be

MAINTENANCE PROCEDURE

43.1 H765 Power System Fault Isolation
The H765 power system (Figure 3-2) consists of field

established according to environmental conditions at the
particular installation site. Mechanical checks should be

replaceable

performed as often as required to enable fans and air filters

discovered, the following steps and associated flowchart

(if applicable) to function efficiently. All other preventive

(Figure 4-1) can be utilized to isolate to a faulty module:

maintenance

tasks

modules.

Once

a power system failure is

should be performed on a regular

schedule determined by reliability requirements. A recom-

Ensure that the H765 is plugged in and getting

primary ac power (115 Vac/230 Vac).

mended schedule is every 1000 operating hours or every
three months, whichever occurs first.
2.
4.2.2

Check CB1 on the ac input box.

Physical Checks

The following is a list of the steps required for mechanical

Utilizing the flowchart (Figure 4-1) and H765
power system schematic (Figure 3-2), isolate

checks and physical care of the BA11-K.

the faulty module.

Check all fans to ensure that they are not
4.

obstructed in any way.

Replace the module as described in Paragraph
4.4.

Inspect all wiring and cables for cuts, breaks,

frays, deterioration, kinks, strain, and mechani-

refer to

wiring or cable covering.

regulator checks and adjustments.

4.2

T E

When a fault is isolated to a voltage regulator,

cal security. Repair or replace any defective

Paragraphs

4.3.2-4.3.4

for voltage

CHECK REGULATOR LIGHTS*

AT POWER DISTRIBUTION

BOARD MATE-N-LOK (J3,45,J9, OR J11)

- MEASURE REGULATOR

VOLTAGES PER TABLE 4-2

ALL

REGULATOR

VOLTAGES

CORRECT PER
TABLE 4-2

FAILURE MOST LIKELY
IN REGULATOR,

ALL

TRANSFORMER ASSEMBLY,

REGULATOR

| POWER DISTRIBUTION

OUTPUTS

CHECK FOR

BOARD, OR LOAD. ISOLATE
BY CHECKING REGULATOR
:
INPUT AND OUTPUT.

BAD

FAULTY WIRING

iYES

TO BACKPLANE

AT AC INPUT BOX SET CB1 TO OFF

AT AC INPUT BOX
DISCONNECT P5

FROM J5

SET CB1 TOON

MEASURE LINE VOLTAGE
115 Vac or 230 Vac AT J5

CHECK THE FOLLOWING
LINE

VOLTAGE
PRESENT

FOR A FAULT:

1. ACINPUT BOX

2. THERMAL SWITCH ON

TRANSFORMER ASSEMBLY

3. CONSOLE OR POWER ON SWITCH

*Regulator lights are lit during
normal operation.

CHECK FOR FAULTY

TRANSFORMER ASSEMBLY

11-2571

Figure 4-1

H765 Fault Isolation Flowchart

EEILL

4.3

+20 V

+5 V ADJUSTMENT

-5V

ADJUSTMENT

-15V ADJUSTMENT

7111-42

Figure 4-2

Regulator Adjustments

Table 4-2
Regulator Specifications

Regulator

Voltage and Regulation

Maximum Voltage at

Maximum Qutput

at Backplane

Regulator (Note 1) (Vdc)

Current (A)

Maximum Peak|

to-Peak Ripple

H744

+5 Vdc £ 250 mV

5.5

200 mV

H745

-15 Vdc + 750 mV

450 mV

H754

+20Vdc

215

(Note 4)

5411086 | +15 Vdc+ 10%
Notes:

(Note 2)

-5 Vdc £ 250 mV

5.5

‘

__—

1—-8 (Note 3)

1. Do not adjust the regulator to these voltages. They represent the maximum regulator voltage prior to

crowbar.

. At backplane. Typical ripple =~ +3%.
. Maximum -5 V current is dependent upon +20 V current. It is equal to 1 A plus the current of the

+20 V supply up to a total of 8 A.
. When adjusting the output of H754, adjust +20 Vdc first, then -5 Vdc (Paragraph 3.4.6).

4-4

(Table 4-2) are not exceeded. These voltages

4.3.2 Voltage Regulator Checks and Adjustments
Correct power system voltages at the backplane are critical

represent the maximum regulator voltage prior

to crowbar. (Do not adjust the regulator to

to a properly operating system. The power system voltages
are supplied by the regulators listed in Table 4-2. Each

these voltages.)

voltage regulator has an adjustment potentiometer (Figure

4-2). The H744, H745 and H754 adjustment potentiometers are located next to the output lamp. Perform the
following steps to ensure that the voltages are within
tolerance. If a voltage regulator cannot be adjusted to meet

the tolerance, check for a bad regulator, power distribution

board, or wiring.

Using an oscilloscope, measure the peak-to-peak

ripple content on all dc outputs (Table 4-2).

4.3.3

Voltage Regulator Troubleshooting

The voltage regulators in the H765 power system are

designed to be

replaced

when

failure is detected.

Using a DVM, measure the output voltages
under normal load conditions at the backplane

However, there are unique situations when a regulator must

(Table 4-2).

indications, the most probable cause, and corrective action

Adjust voltages at the backplane to the toler-

required. This table should be used in conjunction with the
regulator’s theory of operation (Chapter 3) and the print

~ ances specified in Table 4-2, as required.

be repaired in the field. Table 4-3 lists the primary fault

set.

Using a DVM, measure the voltage at the
regulator (or power distribution board). Ensure
that the maximum voltages at the regulator

Once the repairs have been accomplished or a new regulator
is installed (Paragraph 4.4.8), refer to Paragraph 4.3.2 for
voltage regulator checks and adjustments.

~ Table 4-3

H744, H745, H754 Voltage Regulator Troubleshooting Chart

Fault Indication

| Mdst Probable Cause

No output voltage

1. D1 (bottom of D1 will appear burnt).

Replace regulator or D1.

2. E1 (DEC 723, IC voltage regulator).

Replace regulator or E1 (Figure 3-9).

3, Misadjusted output voltage.

Shut power off and turn voltage adjust fully
ccw (below crowbar voltage). Turn power on
and slowly increase voltage, per Table 4-2, until

Corrective Action

correct value is obtained.

Blown fuse

1. Q2 (pass transistor).

2. Excessive 1oading of voltage regulator.

- Replace voltage regulator or pass transistor and
.associated components.
Replace fuse and check loads.

4.3.4

Regulator Bench Test Procedures (H744, H745, and

NOTE

H754)

An activated crowbar or a short-circuited out-

This paragraph suggests procedures to troubleshoot and test

put in an otherwise properly operating voltage

the H744 +5V regulator, H745 -5 V regulator, and H754

regulator will not cause F1 to blow.

+20V,

-5V

regulator

modules.

The

procedures

are

intended to aid in locating a fault, provided the fault has

If fuse F1 is not blown and the area of etched

not destroyed the etched circuits.

circuit around the ac input to the bridge circuit

is not damaged, it is safe to apply an ac input to
When replacing a faulty voltage regulator, the new voltage

the voltage regulator to determine if the regu-

regulator may need adjustment to compensate for the load.

lator is overloaded by a short circuit across the

If the new regulator is initially adjusted too high, it may

output.

activate the crowbar circuit and provide no output when
initially installed. If this happens, turn power off and rotate

the adjustment potentiometer counterclockwise. Then re-

Connect the voltage regulator to a test bench

source and advance the Variac to about 90 V

apply power (regulator should not crowbar) and adjust the

(20 Vac at voltage regulator input).

regulator output.

output is near 0 V, turn the voltage adjustment

If the

fully counterclockwise and repeat the test.
4.3.4.1

Initial Tests —- When a power system fault has been

isolated to a voltage regulator (H744, H745, or H754),

If the regulator appears overloaded, check for a

examine internal fuse F1. A blown fuse usually indicates

short

that the main pass transistor Q2 and/or one of its drivers,
Q3 or Q4, has short circuited.

across

the

output and for

|
4.3.4.3

circuit

component failure in the crowbar circuit.

Testing a “Dead” Regulator — Use the following

Check for damage to base-emitter bleeder resis-

procedure to test a faulty regulator that does not exhibit

tors and a scorched etched board in the area of

the symptoms described above.

Q3 (and Q4 if applicable).

1.
2.

Apply

115Vac

the

test

bench

source

(25 Vac at the voltage regulator input), with no

If the pass transistor and drivers check OK on a

VOM, the fault may be caused by continuous

load on the regulator output.

base drive to the first driver, Q4 (Q3 in H754).
2.

Check level shifter Q5 for a short circuit.

Check for 30 Vdc across filter capacitor Cl1

(and C2if applicable).
3.

Check the resistance to ground at the input to
3.

precision voltage regulator integrated circuit E1

Check for

(pins 4 and 5) to determine if an external short

+15Vdc at pin

12 of precision

voltage regulator E1. No voltage at this point

could mean zener diode D2 (H744) or D3

circuit is affecting the IC.

(H754) has failed.
4.

Use the VOM to check for a short circuit
4,

between fuse terminals and ground. Possible
|

short circuits involving mounting TO-3 com-

Check for 6.8—7.5 Vdc at pin 6 of El with

respect to ground, pin 7.

ponents to the heat sink may be located by
5.

connecting VOM leads between TO-3 cases and

4.3.4.2

If all voltage measurements steps 2, 3, and 4 are

a regulator bracket mounting screw on the end

OK and there is no output voltage, pin 5 of El

of the heat sink.

should be positive with respect to pin 4.

El, pin 2, should be +0.6 V with respect to pin 3. If it is

Output Short Circuit Tests — A voltage regulator

that provides no output or low output without causing fuse

not,

indication is obtained, precision voltage regulator E1 is OK

to blow, is probably working into a short-circuited

connect the emitter and base of Q5. If a 0.6 V

and the fault is probably caused by Q5 or Q4 (Q3 in H754).

output.

4-6

4.3.4.4

Testing a Voltage Regulator After Repairs — Be-

Advance the Variac to 130 Vac and retumn to

fore returning a repaired voltage regulator to service, it
should be checked as follows:

115 Vac.
Apply

Connect the repaired voltage regulator to the

Set

the

voltage

sound

adjustment

fully

counter-

indicates possible

instability.

H744

+5.10 Vdc

noise should be heard under no-load conditions.

H745

~15.10 Vdc

Be sure Q2 is connected and soldered before

H754

+25 Vdc between +20

until

output voltage is indicated (at

approximately 60—80 Vac input). No audible

The

loading the regulator.

and -5 V outputs

L
.t ]

30V

50-200pus
FULL LOAD

Vout —=

NOTE

30 volt

level

NOTE 2

shifts with AC input voltage,

Small 120Hz jitter is normal.

NOTE 2:

Peak noise=1% max.
Measure noise with a short 100§ terminated piece of foil
coax. Normal 10.1 scope probe will not give an accurate
noise

measurement,

11-1075

Figure 4-3

output

Check

Apply 100 percent load and set the voltage
adjustment for nominal output as listed:

(Close the input circuit breaker and advance the

Variac

load.

waveforms as indicated in Figure 4-3.

clockwise and set the load to zero.
3.

30-50 percent

whistle may be heard. A buzz or harsh hissing

appropriate source connector.,

voltage should remain nearly constant. A clean

Typical Voltage Regulator Output Waveforms

4.7

Apply

200

decrease

percent

the

load

and

frequency

check

for

the

output

and

~ The removal procedures include:

voltage.

CAUTION

H765 power system access procedure.
H744,H745, and H754 regulator removal.

If the output voltage does not decrease

noticeably (approximately 1V on H744,

"AC power input box and 5411086 regulator

or 1 to 5V on the H745 and H754), do

removal.

not attempt the following short circuit

test.

Fan removal.

Short circuit the output. The regulator should

Transformer assembly removal.

continue to operate at a low frequency with a
Power distribution board removal.

clean, smooth whistle and stable waveforms.
10.

Increase the voltage adjustment and observe the
output voltage when the crowbar circuit fires.

The output voltage should be within the follow-

4.4.2

H765 Power System Access Procedure (Figure 4-4)

ing ranges:

H744

6.00—6.65V

H745

16.8—20.5 V

Remove ac power by disconnecting the ac line

cord from the ac power source.
Fully

extend

the

BAI1-K

from

the

rack,

ensuring that cables do not bind.

H754

25.0-30.0 V and
~-6.00to -7.00 V

Remove the BA11-K’s top cover by removing
SIX SCIEWS.

4.4

H765 POWER SYSTEM SUBASSEMBLY REMOVAL

PROCEDURE

Remove the cable clamps by removing four

SCTEWS.
44.1

Introduction

The H765 power system access procedure enables the H765

To remove the H765’s top cover, loosen the top

to be accessed for adjustments and subassembly removal.

three screws and remove the back four screws.

4-8

BACKPLANE

IRCOINGD AP LN
SRS

weAv

AP IANED.

3IIIN

LNV LISV

IASIRCIIEIALY

SCREW HINGE

H765

POWER

H765

SYSTEM

POWER

SCREWS

SYSTEM

POWER

DISTRIBUTION

THIL

BOARD

7111-16

4.4.3 H744, H745, and H754 Regulator Removal (Figure

WARNING

4-5)

Power must be removed prior to removing regulators.

Perform the H765 power system access pro-

cedure (Paragraph 4.4.2).

Disconnect the Mate-N-Lok from the regulator
to be removed.

Rotate the BA11-K 90 degrees.

Remove three screws, two on the top and one
on the bottom of the regulator (Figure 4-5).

Hold

H765

.CAUTION '

place

while

removing

Rotate the BA11-K 90 degrees to the horizon-

tal position.

SErEwS:
3.

Tilt the H765 power system by removing two
H765 power system screws on each side of the

H765 (Figure 4-4).
4.

Remove the bottom cover of the BA11-K.

To remove regulator, slide it out.

Install new regulator per Paragraph 4.4.8.

REGULATOR

REGULATOR
MOUNTING
SCREWS

Figure 4-5

Regulator Removal

4-10

KWL

CAUTION

Use the correct length screws when installing regulator

REGULATOR
MATE-N-LOK

—

4.4.4

AC Input Box and 5411086 Regulator Removal

Disconnect all the Mate-N-Loks connected to
the front and back of the ac input box (Figure

Perform the H765 power system access pro-

4-6).

cedure (Paragraph 4.4.2).

Rotate the BA11-K 90 degrees.

Tilt the H765 power system by removing the

CAUTION

Hold the ac input box in place while

two screws on each side of the H765 (Figure

4-4),

Disconnect the Mate-N-Loks from the 5411086
regulator.

performing the next step.

|
6.

Remove three screws and slide out the ac input

box (Figure 4-6).

WARNING

Be sure that ac power is removed prior to

regulator.

removing the ac input box or 5411086
|

Remove 5411086 regulator from the ac input

box.
Install a new regulator per Paragraph 4.4.8.

AC INPUT BOX

CIRCUIT BREAKER

AC LINE CORD

MOUNTING SCRENS

AC INPUT BOX

REGULATOR

MOUNTING SCREWS

MOUNTING SCREWS
7111-41

Figure 4-6

H765 Power System

4-11

4.4.5

Fan Removal

On the module side of the fan, remove the two

screws holding the fan (Figure 4-7).
1.

Perform the H765 power system access pro-

cedure (Paragraph 4.4.2).

Slide the fan up and out of the H765 and

disconnect the jack from the fan, (1-1/2 in.

fan).
NOTE

The BA11-K should be in a horizontal

For boxes with 2 in. fans, remove the power

distribution board and slide the fan from the

position when removing fans.

bottom of the box chassis.

WARNING
Ensure

power

is removed prior to

CAUTION

replacing fans.

When installing the fan do not tighten the

screws

beyond

in./lb.

Tightening

screws beyond 10 in./lb may cause the
Remove all modules.

fan to bind.

BOX
FAN

FAN

JACK

BOX
FAN

7111-6

- Figure 4-7

Fan Removal

4.4.6 Transformer Assembly Removal

WARNING
Remove ac power before performing this pro-

cedure.
1.

Remove

the H745, H754,

Disconnect the transformer assembly’s Mate-NLoks (Figure 4-8).
Remove

_both

screws

from

the

transformer

assembly’s cable clamp (Figure 4-9, sheet 2).

and both H744

regulators per Paragraph 4.4.3.

Remove the ac input box per Paragraph 4.4.4.

Rotate the BA11-K to the horizontal position.

Remove the transformer assembly’s mounting

screws and nuts (Figure 4-9, sheet 1) and lift

Remove both fans per Paragraph 4.4.5.

out the transformer assembly.

OIL FILLED
LINE CAPACITOR
s

THERMAL

SWITCH

TRANSFORMER _—
ASSEMBLY

VARISTOR

TERMINAL
STRIP

7111-4

Figure 4-8

Transformer Assembly

AC INPUT BOX OPENING

TRANSFORMER

(AC INPUT BOX REMOVED)

(LOCATED BEHIND SHEETMETAL)

7111-11

TRANSFORMER ASSEMBLY

MOUNTING SCREWS

Figure 4-9

Transformer Assembly Removal (Sheet 1 of 2)

CABLE CLAMP

MOUNTING
SCREWS

TRANSFORMER

ASSEMBLY

TRANSFORMER
ASSEMBLY

CABLE CLAMP
7111-10

Figure 4-9

Transformer Assembly Removal (Sheet 2 of 2)

MOUNTING
BRACKETS

GROUND

FLYING LEADS

LEAD

Figure 4-10

4.4.7

17111-3

Power Distribution Board

Power Distribution Board Removal

Remove loads from regulator by disconnecting

Mate-N-Loks J3, J5, J7, J9, and J11

on the

power distribution board.

Remove

WARNING.
from the

power

H765

power

Turn on power to regulator

system.

NOTE

If regulator crowbars, turn power off and
rotate regulator voltage. Adjust fully ccw
1.

Disconnect all Mate-N-Loks, ground leads, and

. (below crowbar voltage). Turn on power.

console power wires from the power distribu-

tion board.

Using a DVM, measure voltage at power distribution board to ensure that voltage is within

Remove the four screws from the mounting

limits specified in Table 4-2. Adjust voltage if

bracket (Figure 4-10) and remove the power

necessary.

distribution board.
6.

Turn off power and reconnect Mate-N-Loks J3,
J5,

4.4.8

Regulator Installation

1.
2.

Verify that power to H765 power system is off.
Install regulator.

J9,

and J11

on power distribution

Turn on power and check regulator voltage at
backplane
necessary.

. 4-16

J7,

board.

per

Table

4-2.

Adjust
\

voltage if

CHAPTER 5

UNPACKING AND INSTALLATION

5.1

screws and slide the computer back and forth. This allows

INTRODUCTION

This chapter provides information on the unpacking and
installation of the BA11-K mounting box. Information on

the

installation certification is also included.

5.2

UNPACKING

slides

assume

position that causes minimum

binding. Retighten the mounting screws.

ACPOWER SUPPLY CONNECTION

5.4.1

Connecting to 115 Vac or 230 Vac

The BA11-KE/KF, designed for use on 115 Vac/230 Vac

The BA11-K is shipped ready to operate in a protective box
(Figure 5-1). Remove the BA11-K from the box and
visually inspect for damage. Save the shipping cartons and
packaging materials in case it is necessary to return the
BA11-K for service. The slide mounts are attached to the
BA11-K, but the mounting screws are packed in a bag

circuits, is equipped with a three-prong connector, which,
when inserted into a properly wired 115 Vac or 230 Vac

outlet, grounds the chassis. It is unsafe to operate the
BA11-K unless the chassis is grounded, since normal leakage
current from the power supply flows into metal parts of the

chassis.

placed in the shipping container.

If the integrity of the ground circuit is questionable, the

5.3

user is advised to

INSTALLATION IN A CABINET

measure

the potential between the

computer case and a known ground with an ac voltmeter.

Refer to Paragraph 2.7 for cabinet and slide mounting
specifications. The front of the fixed slide has an integral
bracket and is mounted in the cabinet with two screws that
are secured with captive (Tinnerman) nuts. The rear of the
fixed slide is attached to a separate L-shaped bracket with
two screws and nuts. The bracket is attached to the cabinet
with two screws that are secured with captive nuts. Mount
the fixed slides equidistant from and parallel to the floor.

The BA11-KE/KF operates at voltages ranging from 90 V

to 132 V/180V to 264 V (47 Hz—63 Hz). The plug configuration and specifications are shown in Figure 5-2.

For installations outside of the United States or where the
National Flectric Code does not govern building wiring, the
user is advised to proceed with caution.

Lift the BA11-K and slide it carefully into the fixed guides
until the slide release engages. Unlock the slide release and
push the BA11-K fully into the cabinet. Extend the
BA11-K enough to allow access to the front mounting
screws. Slightly loosen the front and rear slide mounting

5.4.2

Quality of AC Power Source

If the BA11-K is to be installed in an electrically noisy
environment, it may be necessary to condition the ac power
line. Digital Field Service engineers can assist customers in
determining if their ac line is satisfactory.

5-1

SIDE PROTECTOR

REAR PROTECTOR

\ POLY BAG

BEZEL PROTECTOR—\\\&

FOAM PROTECTOR

11-2569

Figure 5-1

BA11-K Packaging

5-2

230 V
MALE PLUG

115v
MALE PLUG

(SINGLE PHASE)

( SINGLE PHASE)
GROUND

GROUND

NEUTRAL
OR RETURN

PHASE

CONNECTOR

SPECIFICATIONS

NEMA*
DESCRIPTION

CONFIGURATION

POLES |WIRES

PLUG

RECEPTACLE

DEC PART NO.

115V,
15 AMP

5-15

90 -08938

12-05351

230V,
15 AMP

6-15

90-08853

i2- 11204

*ADD P SUFFIX FOR PLUG
ADD

R SUFFIX

FOR

RECEPTACLE

Figure 5-2

5.5

H=-25372

Connector Specifications

run. The user’s manual lists the devices that each diagnostic

REMOTE POWER CONTROL

Power control (Figure 5-3) of the BA11-K can be accom-

will exercise. Once the diagnostic is selected, the respective

diagnostic

plished by the following three methods:

write-up

should

consulted

for

specific

operating instructions. If the user is not familiar with

A key switch can be utilized to control the

console operation and/or procedures for loading paper

BA11-K. This is accomplished by connecting

tapes, he or she should read the applicable manual.

the proper cable to J2 or J3 on the ac input

box.
I

Mate-N-Loks J1, J2, or J3 on the ac input box

can be configured to enable a power controller
TO

MOUNTING

OR FROM |
|3
EXTERNAL | |o

1-3

2-3

on/off switch, only if pins 1 and 3 of J3 are

BOX

AC INPUT BOX

POWER CONTROL

CB1 on the ac input box can be used as an

oN { J2

OFF | ]

shorted together.

2
k

5.6

BA11-KE,KF

to control application of ac power.

INSTALLATION CERTIFICATION

-0

Once the BA11-K has been installed, it is strongly recom-

CONSOLE

POWER

mended that a system diagnostic be run to ensure that the
equipment operates correctly and that installation has been

‘

properly performed. Because system configurations vary

SWITCH
1-3 ON

POWER

2-3 OFF

CONTROLLER

widely, no one diagnostic will completely exercise all the

attached devices.

OUTLET

—

|ST—

|2
|3

—

—
11-2563

The user’s manual that comes with the diagnostic package
should be consulted for the appropriate diagnostic to be

Figure 5-3

5-3

Power Control

Reader’s Comments
9

EK-BA11K-MM-002

BA11-K Mounting Box Manual

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