Allen-Bradley 1771-P4R Installation and user guide

Power Supply Modules
(Cat. No. 1771P4R and P6R)
Installation Data
1
AllenBradley
Redundant Power Supplies
(Cat. No. 1771-P4R and 1771-P6R)
Installation Data
This document provides you with the following information:
what this package contains
tasks on installing your power supply module
how to interpret indicators
flow charts for troubleshooting your power supply module
When you receive your 1771-P4R or -P6R power supply, you should see
the following in the box:
one 1771-P4R or 1771-P6R power supply module
one 3-position terminal block (attached to module)
one 5-position terminal block (attached to module)
one redundant cable
To install your power supply module you need to know how to perform the
following tasks:
set the jumpers
set the I.D. selection and configuration switches
place the power supplies
connect the redundancy cables
wire the alarm relay
connect input power
To the Installer
What This Power Supply
Package Contains
Installing the Power Supply
Module

Power Supply Modules
(Cat. No. 1771P4R and P6R)
Installation Data
2
Set the Jumpers
Each power supply module has two jumpers located at the back of the
power supply near the edge connectors. The jumper selection provides the
proper voltage regulation for the different power supply configurations.
The power supply can be configured to support local or remote sensing by
setting the jumpers.
To configure the supply:
1. Position the power supply module so that the jumpers and pins are
facing upward (as shown in figure 1).
Figure 1
Power Supply Jumpers
2. Set the jumpers as shown in table A. Use needle nose pliers to
position the jumpers.
Table A
Jumper Settings
For this configuration Set jumpers to:
A power supplies in a powersupply
chassis (1771PSC) connected to an I/O
chassis.
right position
All other configurations. (These power
supplies are shipped with jumpers set to
the left.)
left position
Important: If the power supplies are located in a 1771 I/O chassis, the
jumpers must be set to the left position. System malfunction may
otherwise occur.

Power Supply Modules
(Cat. No. 1771P4R and P6R)
Installation Data
3
Set the I.D. Selection and Configuration Switches
Each power supply in a redundant system must be assigned a different
identification number. To do this, you must set the I.D. selection switches
located on the left side of the module (figure 2). A cutout in the metal
cover of the module provides access to these switches.
Figure 2
l.D. Selection Switch
Switches 1 through 4 are for the power supply identification number.
Switches 5 and 6 are set based on the configuration zone.
To set the switches, follow this procedure:
1. Close the I.D selection switch (1 through 4) that represents the
number you selected for that power supply.
2. Determine the configuration zone being used so you can set switches
5 and 6. To determine the configuration zone, you must know the
maximum chassis current draw and the ambient air temperature of the
chassis. Refer to table B.
Table B
Configuration Zones A, B, and C
Maximum Current Draw in Amps Ambient Temperatures
60°C 55°C
08 A A
814 B B
1416 C
1620 C
2024 Not permitted
3. Position switches 5 and 6 based on the configuration zone you
determined. Table Cshows switch positions for configuration zones.

Power Supply Modules
(Cat. No. 1771P4R and P6R)
Installation Data
4
Table C
Switch Positions
If Configuration Zone Is Set Switches:
A 5 and 6 OPEN
B 5 CLOSED and 6 OPEN
C 5 OPEN and 6 CLOSED
Place the Power Supplies
WARNING: Turn off the power supply module before
removing it from or inserting it into a chassis. Failure to observe
this warning could alter processor memory, damage module
circuitry, and cause unintended operation which could possibly
cause injury to personnel.
You can place these power supply modules into any I/O module slot in any
current chassis (1771-A1B, -A2B, -A3B, -A3B1, -A4B, -PSC).
The primary requirement for placing redundant power supplies is the need
to allocate 2 to 4 adjacent slots in your 1771I/O chassis for the modules.
Important: Series A I/O chassis CANNOT be used with 1771-P4R,
-P6R modules.
Connect the Redundancy Cables
The power supply redundancy cables allow the power supplies to
communicate load-sharing data. The two connectors on each supply are in
parallel to permit three or four supplies to be daisy-chained together in a
redundant system.
To connect the cables:
1. Connect the redundancy cable between the connectors labeled P/S
REDUNDANT on the power supply as shown in figure 3.
2. Loop the cable over the top of the I/O chassis to avoid picking up
signals induced from I/O wiring.

Power Supply Modules
(Cat. No. 1771P4R and P6R)
Installation Data
5
Figure 3
Connecting the Redundancy Cables for a 2, 3, or 4 Supply System
Wire the Alarm Relay
A 3-position terminal block labeled RELAY on the front panel of the
module provides you with a means of communicating the status of the
power supply to some alarm device. The contacts on the relay are rated at 1
Amp, 250V ac maximum. The relay energizes within 0.5 seconds after
sufficient input power is applied and no error conditions have been
encountered. The error conditions include 5V output overvoltage,
undervoltage, or overcurrent and internal reference error. The relay
de-energizes within 10 seconds following detection of an error condition or
loss of power. Contact bounce may occur for 100 ms.

Power Supply Modules
(Cat. No. 1771P4R and P6R)
Installation Data
6
The terminal block has three lines (figure 4):
NC (Normally Closed)
COM (Common)
NO (Normally Open)
Using the normally closed side of the block will keep the relay contacts
open until unit failure (when it will close). Using the normally open side of
the relay will keep the relay contacts closed until unit failure (when it will
open).
To wire the relay, place the incoming line in the NC or NO position and out
the COM position to the load. Any spare point on an input module can be
connected and used for signaling by the relay.
Figure 4
Alarm Relay and AC Power Connections

Power Supply Modules
(Cat. No. 1771P4R and P6R)
Installation Data
7
Connect Input Power
Figure 4shows the overall configuration of the ac power connections. To
correctly connect the wire to the terminal:
1. Connect the high side of the power source to the L1 terminal of the
power supply.
2. Connect the low side of the power source to the L2 or N (neutral)
terminal of the power supply.
3. Connect the GND (ground) terminal of the power supply to the
central ground bus in the enclosure.
WARNING: Pay close attention to the ac GND and L1
connections when wiring the terminal block. An error here
could cause the ac to be applied to the chassis.
WARNING: Check that the input voltage rating on the power
supply front panel agrees with the available power source.
Application of the incorrect line voltage can cause severe power
supply damage.
Figure 5shows details of how to connect a wire to a terminal on the
terminal block. You can connect these wires while the terminal block is
plugged into the supply, or you can remove the terminal block to lay it on a
flat surface to connect these wires. To remove the terminal block, pull it
straight out out from the receptacle on the module.
The two undesignated terminals do not connect to any electrical circuit on
the module. Each of the three functional terminals accepts a single
14-AWG wire max.

Power Supply Modules
(Cat. No. 1771P4R and P6R)
Installation Data
8
To connect a wire to a terminal:
1. Strip 0.35 inches of insulation off the wire.
2. Spring the clip open open to insert the wire, using a wedge-tipped
tool such as a small screw driver If you leave the terminal block
plugged into the supply, insert the tool parallel to the wire (push
straight in). If you remove the terminal block and lay it on a flat
surface, insert the tool perpendicular to the wire (push straight down).
3. After making the wiring connections, re-insert the terminal block into
the front plate if you removed it. Be sure that the plug is completely
inserted and that the locking prongs are engaged.
Figure 5
Connecting a W ire to a T erminal
Once you have completed the tasks up to this point, you can turn the power
switches on. Turn all the power switches on at the same time. If everything
is set up correctly, all P/S ACTIVE (green) indicators will be on and all
NON REDUNDANT SYSTEM (yellow) indicators will be off.

Power Supply Modules
(Cat. No. 1771P4R and P6R)
Installation Data
9
Your power supply has two indicators located in the upper half of the
module front panel.
The top indicator is yellow and is labeled NON REDUNDANT SYSTEM.
This indicator tells you that the number of supplies in operation is below
the number required for redundant operation. The yellow indicators in a
redundant system operate together; they are either all on or all off.
The lower indicator is green and is labeled P/S ACTIVE. Table D shows
how to interpret the P/S ACTIVE indicator.
Table D
Interpreting the P/S ACTIVE Indicator
If the Indicator is: Then:
On This power supply is operating normally and a sufficient number of
power supplies is operational for the system configuration.
Off The supply has detected one of the following conditions:
Gdc overvoltage (the supply shuts down)
Gdc undervoltage (the supply shuts down)
Gdc overcurrent (the supply shuts down)
Gpower switch turned off (the supply is turned off)
Gac undervoltage
Ginsufficient number of operational power supplies for the system
configuration
When the P/S ACTIVE indicator is off because of an ac
undervoltage or because an insufficient number of supplies is
operational, the power supply may continue to deliver output power.
When you troubleshoot your power supplies, you may be required to
remove and replace the power supply while power is still applied to the
chassis. The following procedures describe the correct way to remove and
insert your power supplies.
Interpreting the Power Supply
Indicators
Troubleshooting Your Power
Supplies

Power Supply Modules
(Cat. No. 1771P4R and P6R)
Installation Data
10
Removing the Power Supply
1. Flip the POWER switch on the front panel to the Off position, only
on the unit to be removed.
2. Remove the ac input terminal block, the alarm relay terminal block,
and the redundant cables only from the unit to be removed.
3. Slide the unit out of the chassis and note the following settings:
I.D selection switch setting (1 through 4)
configuration switch setting (5 and 6)
jumper setting (local or remote sensing)
input voltage rating on the front panel near the ac input connector
You will set the replacement unit to the same settings.
Inserting the Power Supply
1. Configure the supply to the same settings as the unit removed.
2. Flip the POWER switch on the front panel to the Off position.
3. Insert the module completely into the slot in the chassis.
4. Connect redundant cables, alarm relay terminal block, and ac input
terminal block.
5. Flip the POWER switch to the On position.