Allen-Bradley 1771-P1 Installation and user guide

System Power Supply
(Cat. No. 1771-P1)
Installation Data
Use this publication to install a 1771-P1 system power supply.
You perform these tasks:
prepare to install the power supply
- install batteries into the battery pack
- install the battery-pack housing
install the power supply
- mount the power supply
- connect backplane power
- install the battery pack
connect ac power to the power supply
You must use the 1771-P1 to power these programmable controllers:
1772 Mini-PLC-2processor
1772 Mini-PLC-2/15processor
The power supply provides a regulated 5.1V dc for the logic circuitry of
the processor and I/O modules in the chassis.
If you are installing the power supply on the left side-plate of an I/O
chassis, you must:
install batteries into the battery pack
install the battery-pack housing
To the Installer
Prepare for Installation

Installation Data
System Power Supply
Cat. No. 1771P1
2
Install the Batteries
The 1771-P1 comes with a separate battery pack that supplies memory
backup power if the power supply shuts down due to loss of ac power on
the input line or any other condition. You can use:
Battery1Cat. No. Qty. Shipped With the 1771P1?
Dsize alkaline battery 1771BA 2 yes
lithium battery21770XO 1 no
1The
use of ordinary carbonzinc Dsize batteries is not recommended for this application.
2 For applications where more backup time is desired, use the optional lithium battery . The 1771P1
must be series B or later .
The alkaline battery provides reliable memory backup at low cost.
Because the current requirement of the CMOS memory is relatively small,
alkaline battery life is primarily a function of its own internal discharge,
rather than usage drain. For this reason, batteries used to support memory
circuitry of the Mini-PLC-2 and Mini-PLC-2/15 processor will last nearly
as long as batteries in storage under similar conditions.
Examine the battery pack for a clear label that indicates proper battery
polarity. If there is no such label, observe the polarity shown:
-+
-+ +-
-+
-+
10680/10681
OrientationOrientation
alkaline
battery
alkaline
battery
lithium
battery
battery contacts battery contact
battery pack with 2 alkaline batteries battery pack with 1 lithium battery
A plastic tray at the base of the battery pack helps to protect against
possible alkaline cell leakage. Align each battery within the pack so that
the seam of the battery case faces down, toward this protective tray.
battery
holder
We recommend that you keep a fresh supply of replacement batteries
on hand. Store the replacement batteries in a cool, dry environment.
In emergency situations, you may substitute these D-size alkaline batteries:
National
Eveready
RayOVac
To order replacement batteries for the power supply, contact your local
Allen-Bradley representative.
T
i

9pin plugs
1771CL or CM cable
3pin plug
19568
Labels on each plug
identify proper connection.
Installation Data
System Power Supply
Cat. No. 1771P1
3
Install the Batterypack Housing
The battery pack, mounted on the side of the I/O chassis, provides a
compact housing for the batteries. Use the hardware provided to install the
mounting brackets onto the left side of the I/O chassis.
19567
batterypack
mounting brackets
left side
of chassis
screw
star washer
flat washer
Upper and lower tracks of the bracket
guide the battery pack into position.
If You Are Mounting the Power Supply: Use this Power Cable (Cat. No.)
on the left side of the chassis 1771CL
within 5 cablefeet of the I/O chassis 1771CM
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.
Install the Power Supply and
Connect Backplane Power

Installation Data
System Power Supply
Cat. No. 1771P1
4
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 on Left Side of Chassis: If Mounting Separately:
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
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.

Installation Data
System Power Supply
Cat. No. 1771P1
5
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CL or CM 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
mini-processor 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CL or CM 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 miniprocessor module.
12594I

thumbscrew
19572
If batteries are incorrectly installed, the BATTERY LOW indicator
will flash ON and OFF as soon as power is connected to the
1771P1. If this indicator begins to flash upon initial powerup,
remove the 3pin power cable connector from the battery pack,
remove the pack, and reinstall batteries with reverse polarity.
Installation Data
System Power Supply
Cat. No. 1771P1
6
Install the Battery Pack
1. Connect the 3-pin plug to the socket at the base of the battery pack.
Align the battery pack with the card guides and slide it into
the battery-pack housing.
19571
+-+-
card guides battery pack
3pin plug
3pin socket
2. Tighten the thumbscrew on the battery pack to secure it in
the bracket.

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
12595I
Installation Data
System Power Supply
Cat. No. 1771P1
7
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
System Power Supply
Cat. No. 1771P1
8
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
1If
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.

BATTERY
LOW
D.C.
ON
12596I
Installation Data
System Power Supply
Cat. No. 1771P1
9
The maximum output current of the power supply is 6.5 A. See I/O
module product datas 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 these LED indicators:
Indicator: Normal Operation If Indicator Is: Then:
BATTERY LOW off flashing during initial power up
batteries are incorrectly installed 
reinstall batteries with reverse polarity
during normal operation
battery voltage is beginning to drop
toward levels that will not support the
memory1 replace the batteries2
on internal problem 
replace the power supply
D.C. ON on off it may be due to:
•input voltage level not within
specified range
•blown fuse
•overcurrent
•power supply is inoperative
1
This circuitry detects undervoltage before battery voltage becomes too low for memory backup. This allows you about one week to
install fresh batteries.
2
As long as the power supply is operating, you can replace batteries without losing the miniprocessor module ’s memory contents.
For additional assistance, contact your local Allen-Bradley representative.
Power Supply Outputs
Troubleshooting

Installation Data
System Power Supply
Cat. No. 1771P1
10
Nominal Input Voltage/Current 120V ac @ .75A
220/240V ac @ .38A
Input Voltage for 120V operation
Range for 220/240V operation
98132V ac
196250V ac
Input Power real
apparent
65W @ full load
90VA @ full load
External Transformer 160VA @ full load
Frequency Range 60/50Hz
Isolation Voltage 2500V dc for 1 sec
1800V rms for 1 sec input power to equipment/chassis ground
Output logic circuitry
Voltage memory
5V dc ±5%
5V dc ±5%
Output Current 6.5A maximum @ 5V dc
Power Loss Time Delay 
Input Power Loss to Processor Disable
13.5 ±2.5msec
Battery Type 2 alkaline Dsize 1.5V or
1 lithium Dsize 3.4V
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) 116mm x 285mm x 182mm
(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 side plate of bulletin 1771 I/O chassis or
5 cablefeet from I/O chassis
Cables 1771CM
1771CL
1.52m (5 ft )  connects I/O chassis to panel mounted 1771P1
.30m (1 ft.) - connects I/O chassis to chassis mounted 1771P1
PLC-2 and PLC-2/15 are registered trademarks of Allen-Bradley Company, Inc.
RayOVac is a registered trademark of RayOVac Corporation.
Specifications
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Tel: [phone]
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5X1
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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 1771-2.6 — November 1992
Supersedes 1771-2.6 — July 1984 PN 955113-23 Copyright 1992 Allen-Bradley Company, Inc. Printed in USA