Allen-Bradley 1771-P2 Installation and user guide

9pin plugs
1771CE or CD cable
19568
Labels on each plug
identify proper connection.
Auxiliary Power Supply
(Cat. No. 1771-P2)
Installation Data
This document provides information on:
preparing to install the power supply
installing the power supply
connecting ac power to the power supply
power supply output
troubleshooting
specifications
The auxiliary power supply can power one bulletin 1771 I/O chassis
when used with an adapter module, a 1772 Mini-PLC-2processor, or a
1772 Mini-PLC-2/15processor.
The auxiliary power supply does not provide battery backup. For battery
backup, use a system power supply (cat. no. 1771-P1).
If You Are Mounting the Power Supply: Use this Power Cable (Cat. No.):
on the left side of the chassis 1771CE
within 5 cablefeet of the I/O chassis 1771CD
If you mount the power supply on the left side-plate of the I/O chassis,
mount the I/O chassis first (if you have not already done so). See the
Universal I/O Chassis Installation Data (publication 1771-2.210) for
information on mounting the I/O chassis.
When mounted separately, the power supply can be mounted above or next
to the I/O chassis. It can not be mounted below since it is necessary to
allow convection cooling of both the power supply and the I/O chassis.
A minimum vertical distance of six inches should be maintained.
To the Installer
Prepare for Installation
Install the Power Supply and
Connect Backplane Power

Installation Data
Auxiliary Power Supply
Cat. No. 1771P2
2
Mount the Power Supply
ATTENTION: If you do not remove system power, you could
damage the module circuitry and/or cause undesired operation
with possible injury to personnel.
1. Remove system power.
2. Mount the power supply.
If Mounting Separately: If Mounting on Left Side of Chassis:
use the rear flanges
to mount it to a panel.
Mount the power supply up to 5 cablefeet
from the I/O chassis.
11.25"
(285mm)
263mm
(10.37")
Depth is 182mm (7.16")
116mm
(4.56")
45mm
(1.8")
12593-I
Important: Do not mount the power supply below
the I/O chassis.
19569
Use the four screws supplied with the I/O chassis
to install the power supply onto the I/O chassis.
flat washer
screw
Important: Place the flat washers provided between each mounting
screw and the power supply. If you do not use the flat washers, the
mounting screw intrudes into the I/O chassis and interferes with
module insertion.

Installation Data
Auxiliary Power Supply
Cat. No. 1771P2
3
Connect Backplane Power
To connect backplane power:
1. Connect one 9-pin plug of the power cable to the 9-pin connector
located on the bottom of the power supply.
19570
9pin socket
9pin plug
1771CE or CD cable
2. Connect the other 9-pin plug to the external power supply connector
on the I/O chassis. To make this connection, remove the
processor/adapter module and left-most I/O module from the
I/O chassis.
1 +5.1V dc
2 +5.1V dc
3 chassis ground
4 common
5 common
6 battery low
7 +battery
8 +5V dc memory
9 processor enable
123
456
789
External Power Supply Connector
9pin plug
1771CE or CD cable
1771A2B Series B I/O chassis
Route the power cable through the
bottom of the I/O chassis so that
it does not interfere with the insertion
of the processor/adapter module.
12594I
NY

L1
120V ac
L2
EQUIP
. GND
SPARE
220/240V ac
120V ac
SPARE
120V
Operation
11939
L1
L2
EQUIP.
GND
SPARE
220/240V ac
120V ac
SPARE
220/240V
Operation
metal jumper
metal jumper
120V ac
ac line
120 V ac 1A SB
220/240 V ac 0.5A SB
Installation Data
Auxiliary Power Supply
Cat. No. 1771P2
4
Before connecting ac power to the power supply, you must:
check the input voltage
check the fuse protection
Check the Input Voltage
The power supply is factory-shipped for 120V ac operation. You can use:
120V ac
or
220/240V ac
Two metal jumpers are installed on the front terminal strip at the positions
indicating 120V ac.
ATTENTION: Be sure the power supply is correctly jumpered
for either 120V ac or 220/240V ac. Incorrect jumpering on the
terminal strip may cause improper operation or damage to the
power supply.
If you are using the power supply for 220/240V ac operation, remove both
metal jumpers on the terminal strip from their original 120V positions.
Install one of these jumpers at the terminal labeled 220/240V ac.
Check the Fuse Protection
The power supply is protected from overcurrent at its inputs by a
slow-blow fuse. The power supply comes with one 1A slow-blow fuse
installed for 120V operation. If you are using the power supply for
220/240V operation, remove the 1A fuse and replace it with the 0.5A
slow-blow fuse that is provided. Replacement fuses are shown below:
Input Voltage Fuse Manufacturer's No.
120V ac 3AG
1A
Bussman: MDL 1A
Littelfuse: 313001
220/240V ac 3AG
0.5A
Bussman: MDL 0.5A
Littelfuse: 313.500
A replacement fuse kit (cat. no. 1771-FP) containing both 1A and 0.5A
fuses is available. Contact your local Allen-Bradley representative for
further information.
Connect AC Power

Installation Data
Auxiliary Power Supply
Cat. No. 1771P2
5
Connect AC Power Line
The power supply monitors input voltage for proper operating levels.
If Using the Power Supply for: Normal Input Range1:Minimum Voltage:
120V ac operation 98 to 132V ac 92V
220/240V ac operation 196 to 250V ac 184V
1
If input power is interrupted, the power supply signals the processor to restart automatically when the input
line is restored to the normal ac input range (98V for 120V use, or 196V for 220/240V use).
AC input line connections for either 120V ac or 220/240V ac are made to
the terminals marked L1 and L2. Use the grounding stud located on the
bottom of the power supply to connect the power supply to the system
ground bus. If you cannot do this, connect an equipment grounding
conductor to EQUIP. GND.
19573
L1
120V ac
L2
EQUIP. GND
SPARE
120V ac
SPARE
equipment ground
high side of the line power
low side of the line power
220/240V ac
When you connect grounding conductors to
the power supply grounding stud, place a star
washer under the first lug, then place a nut with
captive lock washer on top of each ground lug.
1Use
the cup washer if crimpon lugs are not used.
grounding stud
ground lug
nut with captive washer
star washer
ground lug1
In applications where the ac line is especially unstable and subject to
unusual variation, a constant voltage transformer can be used to stabilize
the input voltage to the power supply as well as the input voltage to user
devices. If a constant voltage transformer is used, it must have filtering to
remove high harmonic content and provide a sinusoidal output.
The minimum size required for any type of external transformer feeding
the power supply is 160VA at full loading of the power supply.

D.C. ON
12596I
Installation Data
Auxiliary Power Supply
Cat. No. 1771P2
6
For information concerning the handling of fault conditions due to
temporary loss of input line voltage to the power supply, consult the
documentation supplied with the device (remote I/O adapter,
Mini PLC-2/15 processor, etc.) that is controlling the I/O chassis.
The auxiliary power supply provides 5.1V dc with a maximum output
current of 6.5A. See your I/O module data sheets for specific current
requirements.
Power supply outputs have built-in monitoring circuitry to protect logic
circuitry in the I/O modules and the processors. During power-up and
normal operation, outputs are checked for these conditions:
overvoltage
undervoltage
overcurrent
The power supply shuts down if any of these conditions are detected.
If this occurs, cycle ac power to the supply. To do this, disconnect and
then reconnect user-line power, preferably from the user-supplied main
disconnect switch mounted near the power supply.
The power supply has a D.C. ON LED indicator that provides status
indication during power supply operation.
Normal Operation If indicator is: Then:
D.C. ON
on off it may be due to:
•input voltage level not within specified range
•blown fuse
•overcurrent
For additional assistance, contact your local Allen-Bradley representative.
Power Supply Output
Troubleshooting

Installation Data
Auxiliary Power Supply
Cat. No. 1771P2
7
Nominal Input Voltage/Current 120V ac @ .75A
220/240V ac @ .38A
Input for 120V operation
Voltage Range for 220/240V operation
98132V ac
196250V ac
Input Power real
apparent
65W @ full load
90VA @ full load
External Transformer (if used) 160VA @ full load
Frequency Range 60/50Hz
Isolation Voltage 2500V dc for 1s
1800V rms for 1s input power to equipment/chassis ground
Output logic circuitry
Voltage memory
5.1V dc ±5%
5.1V dc ±5%
Output Current 6.5A maximum @ 5V dc
Power Loss Time Delay 
Input Power Loss to Processor Disable
13.5ms ±2.5ms
Replacement for 120V operation
Fuses for 220/240V operation
1A, 3AG (slow blow); Bussmann MDL 1  Littelfuse 313001
0.5A, 3AG (slow blow); Bussmann MDL 0.5  Littelfuse 313.500
Weight 5.89 kg (13 lbs)
Dimensions (W x H x D) 11.6cm x 28.6cm x 18.2cm
(4.56" x 11.25" x 7.16")
Environmental Operating Temperature
Conditions: Storage Temperature
Relative Humidity
0 to 60°C (32 to 140°F)
40 to 85°C (40 to 185°F)
5 to 95%, noncondensing
Location left side of 1771 I/O chassis or 5 cablefeet from I/O chassis
Cables 1771CD
1771CE
1.52m (5 ft)  connects I/O chassis to panel mounted 1771P2
.30m (1 ft) - connects I/O chassis to chassis mounted 1771P2
Use these graphs to determine your:
cooling requirements
power cost
transformer size (unless the transformer manufacturer has a
recommended multiplier for sizing a transformer for an ac-to-dc power
supply)
0
2
4
6
8
0 255075100
0
2
4
6
8
0 20406080
Apparent Power (VA) Real Power (Watts)
Backplane
Load Current
(Amps)
0
2
4
6
8
0 50 100 150 200
Transformer Sizing (VA) =
Real Power (Watts) x 2.5
PLC-2 and PLC-2/15 are registered trademarks of Allen-Bradley Company, Inc.
Specifications

Installation Data
Auxiliary Power Supply
Cat. No. 1771P2
8
With offices in major cities worldwide
WORLD
HEADQUARTERS
Allen-Bradley
1201 South Second Street
Milwaukee, WI 53204 USA
Tel: [phone]
Telex: 43 11 016
FAX: [phone]
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FAX: [phone]
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HEADQUARTERS
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Limited
135 Dundas Street
Cambridge, Ontario N1R
5X1
Canada
Tel: [phone]
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HEADQUARTERS
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1201 South Second Street
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Tel: [phone]
Telex: 43 11 016
FAX: [phone]
As a subsidiary of Rockwell International, one of the world’s largest technology
companies — Allen-Bradley meets today’s challenges of industrial automation with over
85 years of practical plant-floor experience. More than 11,000 employees throughout the
world design, manufacture and apply a wide range of control and automation products
and supporting services to help our customers continuously improve quality, productivity
and time to market. These products and services not only control individual machines but
integrate the manufacturing process, while providing access to vital plant floor data that
can be used to support decision-making throughout the enterprise.
Publication 1771-2.7 — December 1992
Supersedes 1771-2.7 — July 1984 PN 955113-24 Copyright 1992 Allen-Bradley Company, Inc. Printed in USA