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Document:	881 Power Controller User Guide
Order Number:	EK-881PC-UG
Revision:	003
Pages:	28
Original Filename:

OCR Text

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EK-881PC-UG-O03

881
Power Controller
User Guide

Prepared

Educational

Services

Digital Equipment Corporation

April 1988

Digital Equipment Corporation makes no representation that use of its products with those of other
manufacturers will not infringe existing or future patent rights The descriptions contained herein do not
imply the granting of a license to make, use. or sell equipment or software as described in this manual.

Digital Equipment Corporation assumes no responsibility or liability for the proper performance of other
manufacturers’ products used with its products.

Digital Equipment Corporation believes that intormation in this publication is accurate as of its publication
date. Such information is subject to change without notice. Digital Equipment Corporation is not
responsible for any inadvertent errors

Class A Coniputing Devices

NOT'CE: This equipment generates. uses, and may emit radio freqirency energy It has been tested

and found to comply with the limits for a Class A computing device purstant to Subpart ] of Part 15 of
FCC rules for operation in a commercial environment
This equipment, w nen operated in a residential
arsa, may cause interference to radio/TV communications. In such event the user (owner) at his own

expense, may be required to take corrective measures

The postpaid READER'S COMMENTS form requests the user’s cr..ical evaluation to assist in preparing
future documentation

The following are trademarks of Digital Equipment Corporation

VAX

DECnet

UDAS0

RAB2

HSC

SA482

RAB1
TA78-81

KDAS0
RAGQ

RA80
TU78-81

UNIBUS

VMS

RA70

RC25

KDB50

mflgflan

MicroVAX

Contents

1.1

INTRODUCTION

1.2

881 POWER CONTROLLER SPECIFICATIONS . ... ... ......

INSTALLATION
2.1

INTRODUCTION

. . . . . . . e

2-1

000,

2-1

2.2

RACK-MOUNTING (881AANDS88IB) .. ................

LOADDISTRIBUTION . . .. . ... ... . i

2.6

DIGITAL POWER CONTROL BUS CONNECTIONS . ... ... ...

2-8

2.5

EXTERNAL SENSE CONNECTIONS

2-8

POWER CONTROLLER CORD PLUG

2.1.1

AC Power Distribution . . . .. . .. .. ...

...

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

2.9

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

311

Power Controller Circuit Breaker

312

BUS/OFF/ON Switch (S101A)

. .

313

Power Control Bus (Front Panel J10, JI1)

--------------------

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

314

Sequenced Power Control Bus (Front Panel J12, J13)

315

EXTERNAL SENSE Connector (J102)

POWER APPLICATION

TROUBLESHOOTING CHECKLIST

Index

. ......

... ........

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

INTRODUCTION

NN
-

OPERATING INSTRUCTIONS

. . . . . . . e

GENERAL INFORMATION

Lri'dfl
‘wWOwW

Contents

Figures
1-1

881 Power Controller

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

2-1

AC Output Receptacles . .. . .. ...

...

... ...,

...

1-2

2-2

881 Power Controller Rear Output Receptacle

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

2-3

Controller Power Cord Plug Types

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

2-4

Rack-Mounting Installation . . . . . ... .........
... ......

2-5

Vertical Installation . . . . ... . ...

.. ... ...

2-7

2-6

881 Power Controller Front Panel (Aand B) . . . . .. ... .. .. ..

2-8

2-7

881 Power Controller Rear Panel

2-9

Schematic (Version A) . . . . . . . . . .

3-2

Schematic (Version B) . . . .. . ... .. ... ... . ... ...

... ... ...

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

3-5

...

3-6

881 Power Controller Specifications . . . . . ... ... ..........

1-3

2-1

AC Power Distribution Requirements . . . . . ... ... ... ......

2-3

3-1

Controls and Indicators

0o,

3-1

3-2

Power Control Bus Truth Table

... .......

3-2

Tables
1-1

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

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GENERAL INFORMATION

1-1

GENERAL INFORMATION
1.1

INTRODUCTION

This &1 Power Controller User Guide contains installation and operation information for

the user and for field service perzonnel. It does not cover maintenance and servicing. The

&&1 Power Controller (Figure 1-1) is a general-purpose, three-phase power controller that
controls and distributes ac power to various ac devices (power supplies, fans, etc.) packaged
in an operating system.

The following describes the functions of the 881 Power Controller:
+

Controls large amounts of ac power with low level signals

Provides convenient ac power distribution to single-phase loads on a three-phase system

Protects data equipment from electrical noise

Disconnects ac power for servicing and in case of overload

In addition. the 881 Power Controller features are described in the following list:
«

Local and remote switching

SWITCHED receptacles only

Convection cooling

Rack-mounting

AC-line filtering

Moveable strain-relief elbow

DIGITAL power control bus

DIGITAL power control bus delayed output (to allow sequencing of other controllers)

1.2

881 POWER CONTROLLER SPECIFICATIONS

The 881 Power Controller comes in two versions (A and B) divided according to the
mechanical and electrical specifications described in Table 1-1. In addition, each controller

has a moveable strain-relief elbow that, by adjusting a set screw, may be mounted vertically
or horizontally depending on application.

1-2

GENERAL INFORMATION

CX-600A

Figure 1-1

881 Power Controller

GENERAL INFORMATION

Table 1-1

1-3

881 Power Controller Specifications

Specifications

881A

§81B

Input voltage

1207208 Vac nominai, three phase

220-240/381-416 Vac nominal,
three phase

Input frequency

47-63 Hz

Total continuous phase
current rating

24 A per phase

16 A per phase

Iniush current per phase

450 A peak, | cycle

450 A peak, 1 cycle

Power capability

2880 VA per phnse

3840 VA per phase

Output receptacles

9 switched

Output voltage

120 Vac

220-240 Vac

Receptacle current rating

15 A max per outlet

10 A max per outlet

Dimensions

3.38" high x 8.7" deep x 19" wide

3.38" high x 8.7" deep x 19"
wide

Weight

18 Ibs

14 lbs

Mounting

Rack-mountable (19-inch rack)

Rack-mountable (19-inch
rack)

Cooling

Convection

Ambient temperature

5% 10 +50° C (41° 1o 122° F)

§° to +50° C (41° 10 122° F)
(operating)

{(operating})

Relative humidity

95 percent maximum (no

condensation)

95 percent maximum (no
condensation)

Altitude

Sea level to 2400 meters (8000 f)

Sea level to 2400 meters
(8000 f1)

Fusing (intenal circuitry

.375A slow blow (250V)

315A type T (250V)

Complies with Canadian Standards
Association (CSA) standard C22.2.

Complies with Canadian
Standards Association (CSA)
standard C22.2.

Recognized by Underwriters
Laboratories. Incorporated R in

Recognized by Underwriters
Laboratories. Incorporated R
in accordance with UL 478.

only)

Safety

accordance with UL 478.

Classified by Underwriters
Laboratories. Incorporated in

accordance with [EC 435 and
380.

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INSTALLATION

2-1

2
INSTALLATION
2.1

INTRODUCTION

A certain amount of planning is necessary before installing the 881 Power Controller.
Consider the items in the following paragraphs.
WARNING

Hazardous voltages are present inside this equipment. Bodily injury or equipment
damage may result from improper service. Maintenance must be performed by a
qualified service representative.
Implementation of the DIGITAL power control bus or sequenced power control bus permits

normal! control of the power state of computers and certain peripheral devices. It is not
intended 1o meet the requirements of National Fire Protection Association (NFPA) No.
75-7300 E:nergency Power Controls in Computer Rooms. This specification requires an

Emergency Power Control Switch near the operator’s panel and the room EXIT to disconnect

all power to the electronic devices in the room. DIGITAL recommends that the user provide
such switches and protective circuitry as part of site preparation.

2.1.1

AC Power Distribution

The ac power connections on the 881 Power Controller conform to UL, CSA and IEC
standards. The 881 Power Controller hus nine output female receptacles (Figure 2-1). It

also has one input contioller power plug.

WARNING

Do not plug line cords into any of the nine output receptacles in a reversed direction.
The grounding protection is eliminated when a line cord is reversed. See Figure 2-2,

2-2

INSTALLATION

GROMMETED
CORD
OPENING

QUTPUT

RECEPTACLES

PHASE DIAGRAM

Figure 2-1

AC Output Receptacles

P
CXx-601A

INSTALLATION

2-3

CX-2079A

Figure 2-2

881 Power Controller Rear Output Receptacle

While the receptacles are identical for both A and B versions, the controller power cord plug
comes in one of two types to accommodate ac power distribution requirements. For a list of
these requirements, refer to Table 2-1. For the controller power plug designation, refer to
Figure 2--3.

Table 2-1

AC Power Distribution Requirements

Specifications

881A

881B

Receptacle current rating

30A

20A0rl6 A

Input voltage

1207208 Vac, three phase WYE

220/380 Vac to

Wire/Connector type

S5-wire, NEMA L21-30R type

receptacle

240/415 Vac, three
phase WYE
5-wire, 4-pole, IEC

309-type receptacie

2-4

INSTALLATION

NEMA L2171

30R

1£C 309

SN\
@

\ v

USED WITH 881 A POWER CONTROLLER

USED WITH 881-B POWER CONTROLLER
CX-602B

Figure 2-3

Controlier Power Cord Plug Types

CAUTION

To avoid equipment damage, do not connect the controller power cord to the power

distribution system of the building until the procedures in Section 2.3 and Section 2.4
have been completed.

2.2

RACK-MOUNTING (881A AND 881B)

The 881 Power Controller must be the first component mounted into an EIA standard

19-inch cabinet. To install, refer to Figure 2-4 and the following procedure:
1.

Install U-nuts at proper hole locations if necessary. (For the DIGITAL H9646-AH/AJ
cabinels, use holes number (wo and five, counting from the base of the rear vertical
uprights.)

2.
3.

Place the controller between the rear vertical uprights of the cabinet.
Align the mounting slots of the controller with the desired hole locations as mentioned
earlier.

Secure the controller by inserting four 10-32 sems screws through the uprights into the
U-nuts.

Check to see that the controller is rigidly mounted.

INSTALLATION

REAR

VERTICAL
UPRIGHTS

NQ.

\[a/

2-5

10-32 PHILLIPS

HEAD SEMS SCREW

CABINET BASE

U-NUT

HOLE NO.5
CONTROLLER

STRAIN

U-NUT

HOLE NO.
2
CX~603C

Figure 2-4

Rack-Niounting Installation

NOTE

In certain applications, vertical mounting is required. Refer to Figure 2-5.
Whether the controller is mounted vertically or horizontally, the strain relief must be pointed
downward as shown in both figures. If it is not, remove the socket head set screw and rotate
the strain relief collar the shortest distance possible until it is positioned over the optional
screw hole. Insert and retighten the screw.

INSTALLATION

2-6

2.3

LOAD DISTRIBUTION

Install the ac loads 1o the output receptacles of the power controtler (Figure 2-1). Ensure
these loads are compatible with the power distribution system as well as the voliage and
current ratings of the power controller as stated in the following lhist:

CAUTICN
Do not exceed the individual receptacle or phase ratings of the power controller. Refer
to Table 1-1.
*

Use 120 Vac loads of less than 15 amps with 881A controllers with 24 amps/phase
maximum.

Use 220-240 Vac loads of less than 10 amps with 881B controllers with 16 amp/phase
maximum.

In addition, each load must have a male I[EC-type plug of appropiiate rating.
When the plugs are connected to the output receptacles, pass each cord through the

grommeted cord opening shown in Figure 2-1. Connect the plugs in such a way that the
load currents are balanced among the three receptacle phases. A phase diagram is marked

below the receptacles on the controller chassis and is shown in Figure 2—-1. For example,

since J1-J3 are wired to phase 1, J4-J6 to phase 2, and J7-J9 to phase 3, you would insert
three plugs using receptacles J1, J4 and J7, and stagger any additional plugs accordingly.

INSTALLATION 2-7

REAR

VERTICAL

UPHIGHTS

CABINET BASE

JREW

fl 0l

.
h

.
,

STRAIN
RELIEF

POWER

CONTROLLER

)

TM~ \Qfi;
CX—-922A

Figure 2-5

Vertical Installation

2-8

2.4

INSTALLATION

DIGITAL POWER CONTROL BUS CONNECTIONS

If power connections to another cabinet are required, install DIGITAL power bus cables
(DIGITAL part number 7008288-0-0) to the power control bus (J10-J13) on the fron: panel
of the controller (Figure 2-6). Since connectors J10 and J11 are not delayed, and J12
and J13 are delayed in output one-half to two seconds, make the connections according to
application requirements.

FUSE

POWER CONTROL

BUS CONNECTORS
(FL-1)

,\J;/\

unpELAYED

LABEL

'
AR -

1K1

aliad

*\i

\
—~

ORD

STRAIN RELIEF

)

(FFU1505H SOCKET

GROMMETED

';’lOVCIEE:f(S:L;

mEe, X

L[(%@.113

BREAKER

[esep 10

CIRCUIT

HEAD
T
SET SCREW

DELAYED

(0.5 SEC)

CORD

—

POWER

CORD

SERIAL/LOGO
L
LABE

OPENING

BUS/OFF/ON SWITCH

{CLOCKWISE FROM TOP)
(S101A]

Figure 2-6

2.5

CX-604C

881 Power Controller Front Panel (A and B)

EXTERNAL SENSE CONNECTIONS

If external sense connections to another component are required, insert a two-pin female
(socket) MATE-N-LOK connector (DIGITAL part number 12-10821-02 with connector pin
sockets A-PS-1209379-0-0) from that component into the mating male connector on the rear
of the controller. Refer to Figure 2-7.

INSTALLATION

2-9

®0

EXTERNAL SENSE

CONNECTOR

(J102)

Figure 2-7

2.6

X606

881 Power Controller Rear Panel

POWER CONTROLLER CORD PLUG

Insert the controller power cord plug into an appropriately rated (120/208V or 240/416V)
receptacle of the building’s power distribution system. Read Chapter 3 before applying
power.

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OPERATING INSTRUCTIONS

3-1

OPERATING INSTRUCTIONS
3.1

INTRODUCTION

The two basic controls on the power controller are the circuit breaker and the BUS/OFF/ON
switch. These and all but one of the other controls are located on the front panel of the
controller (Figure 2-6). Their functions are described in Table 3-1 and in the paragraphs
that follow.

Table 3—-1

Controls and Indicators

Control or Indicator

Function

CB Circuit breaker

Provides overload protection for the nine output receptacles
and control circuits.

BUS/OFF/ON switch

Controls ac power to the nine ac outlets and selects remote

operation.

" | BUS position

Enables remote control of ac power via the DIGITAL power

Removes ac power from the power controller output
receptacles and Ftevems the power controller from responding

OFF position

control bus connectors.

to power control bus signals.

(®

ON position

Applies ac power to ac outlet receptacles. Power control bus
REQUEST signal is i *nored. Power control bus INHIBIT

signal is valid.

(O EXTERNAL SENSE connector
(2-pin on rear of controller)

Power control bus (3-pin)

Isolates ac power from the output receptacles. The circuit

must then be reset for normal operation by cycling the circuit

breaker off and then on.

Provides a means of controlling the power state of a system
from remote locations. A switch closure between Pins 1 and
3 will supply ac power to the output receptacles. A switch
closure between Pins 2 and 3 will isolate ac power.

Sequenced power contro} bus

Adds a 0.5 to 2.0 second delay to the POWER REQUEST line

(3-pin)

(pin 1).

Fuse

Protects the ac bus from control circuitry overload.

OPERATING INSTRUCTIONS

3-2

3.1.1

Power Controller Circuit Breaker

The power coutrolier circuit hreaker (Figure 2-6) is one means of controlling the ac power
to all the outlets on the controller. 1t also provides overload protection for the ac line loads

and is unaffected by switching the BUS/OFF/ON control descrnibed in Section 3.1.2.

3.1.2 BUS/OFF/ON Switch (S101A)
The three positions of this switch are BUS, OFF, and ON. When the circuit breaker to the
power controller is ON, this switch controls the power to the ac outlet in the following ways:
*

BUS position—Enables remote control of ac power via the DIGITAL power control bus
connectors.

The BUS position is intended for remote sensing of DIGITAL power contro! bus
instructions. This position requires the use of a remote sensing cable not shipped with

the power controller. If you don’t have this cable, or your application does not require
the use of the DIGITAL power control bus, leave the switch in the ON position.
*

OFF position—Removes ac power from the power controller output receptacles and
prevents the power controller from responding to power control bus signals.

ON position—Applies ac power to ac outlet receptacles. Power control bus REQUEST
signal is ignored. Power control bus INHIBIT signal is valid.

3.1.3

Power Control Bus (Front Panel J10, J11)

WARNING
Do not rely on the DIGITAL power control bus to isolate hazardous voltages from the
system. Use the circuit breaker to isolate all hazardous voltages.
The power control bus both supplies and detects signals in response 10 sensors and a master
switch.

Connections to the DIGITAL power control bus are made through the use of

DIGITAL power bus cables (DIGITAL Part Number 7008288-0-0). Pin | is the POWER
REQUEST (requests ac power when the state of Pin 1 is low), Pin 2 is the POWER

INHIBIT (inhibits ac power when the state of Pin 2 is low), and Pin 3 is the RETURN (the
states of Pin | and Pin 2 referenced to Pin 3, not to ground). Use Table 3-2 to determine
bus logic:

Table 3-2

Power Control Bus Truth Table

(Pin 1)

(Pin 2)

(Switched AC Power)

High

OFF

Low

High

Low

OFF

Low

OFF

NOTE
The number of bus controls attached to the power control bus must not exceed 40.

OPERATING INSTRUCTIONS

3~3

3.1.4 Sequenced Power Control Bus (Front Panel J12, J13)
The sequenced power control bus allows products such as disk cabinets to siart sequentially
by adding a 0.5 10 2.0 second delay to the POWER REQUEST line (Pin 1). The sequenced
circuit receives its logic signal from the power control bus (J10 or J11) and retransmits

the delayed signal via another identical connector (J12 or J13). The POWER INHIBIT is
paralleled in the connectors so the inhibit function is not lost. In addition, the sequenced
power control bus meets all the conditions of the power control bus as described in the
preceding section.

CAUTION

Implementation of the DIGITAL power control bus or sequenced power control
bus permits normal control of the power state of computers and certain peripheral
devices. It is not intended to meet the requirements of National Fire Protection

Association (NFPA) No. 75-7300 Emergency Power Controls in Computer Rooms.
This specification requires an Emergency Power Control Switch near the operator’s
panel and the room EXIT to disconnect all power to the electronic devices in the room.
DIGITAL recommends that the user provide such switches and protective circuitry as
part of site preparation,

3.1.5 EXTERNAL SENSE Connector (J102)
This two-pin male receptacle (J102) on the back of the power controller attaches to

DIGITAL cable connector part number 12-10821-02 with connector pin sockets A-PS1208379-0-0. 1t removes power from the loads when enabled by an extemal sensor.
Conditions that a sensor may detect include system overtemperature or system air-flow
loss. To engage the EXTERNAL SENSE, plug an appropriate sensor (one that presents
a switch closure in the event of an out-of-tolerance condition) into the two pins on the
connector. To reset the EXTERNAL SENSE, cycle the circuit breaker off and then back on
again,

WARNING

Do not rely on the EXTERNAL SENSE control to isolate hazardous voltages yrom the
system. Use the circuit breaker to isolate all hazardous voltages.

3.2

POWER APPLICATION

Once the proper use of the controls has been determined and the loads have been attached to
the power controller, switch the power controller circuit breaker to the ON position.

3.3

TROUBLESHOOTING CHECKLIST

If all prior instructions in this manual have been completed and the system does not function
properly, go tisough the following steps in the order listed:
1.

Ensure the controller power cord is plugged in.

Ensure the circuit breaker is in the ON position.

Ensure the BUS/OFF/ON switch is in the appropriate position:

BUS—external control

ON-—local control

OFF—power off

Check fuse continuity after removing power from the controller.

3-4

OPERATING INSTRUCTIONS

Verify integrity of all cable connections.

Verify EXTERNAL SENSE signal is not an INHIBIT signal.

Verify the circuit breaker is set.

Verify the source signal for the DIGITAL power control bus is not an INHIBIT signal.

Verify building ac power distribution.

If the preceding steps do not resolve the problem, contact a qualified service representative.
NOTE
A schematic of each of the two versions of the 881 Power Controller is provided in
Figure 3-1 and Figure 3-2. They are provided for use by qualified service personnel
only.

OPERATING INSTRUCTIONS
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IndeXx
A

881 functions, 1-1

AC power distribution requirements, 2-3
Applying power, 3-3

L
Line-cord plug types, 2-3

B
BUS/OFF/ON switch, 3-2
Bus connections, 2-8

Power control bus truth table, 3-2

Circuit breaker, 3-2
Controls and indicators, 3-1

881 specifications, 1-1
T

881 features,

1-1

Troubleshooting checklist, 3-3

Index