Allen-Bradley ControlLogix 1756-PA75R/A User manual

Publication 1756-IN573C-EN-P - October 2003
Installation Instructions
ControlLogix Redundant Power Supply
Catalog Numbers 1756-PA75R/A (85-265V AC Redundant Power Supply),
1756-PB75R/A (19-32V DC Redundant Power Supply)
Use this publication as a guide when installing the ControlLogix™ 1756-PA75R/A
and 1756-PB75R/A power supplies. These supplies may only be used with Series B
ControlLogix chassis.
To: See page:
See a Description of the Redundant Power Supply 6
See an Overview of the Installation Process 6
Prepare for Installation 6
Identify the Components of a Redundant Power Supply System 7
Recognize Redundant Power Supply Physical Features 8
Use System Set-up Recommendations 9
Allow Sufficient Mounting Space 10
Install Your Redundant Power Supply 11
Ground Your Redundant Power Supply 13
Connect the Cable to the Redundant Power Supply and the Chassis
Adapter Module
14
Connect Solid State Relay 15
Connect Power 16
Route Line Power and Cables 17
Remove the Protective Label 18
Activate the Redundant Power Supply System 18
See Input Power Requirements and Transformer Sizing 19
Troubleshoot with the Status Indicators 20
Replace a Redundant Power Supply 21
See 1756-PA75R/A and 1756-PB75R/A Specifications 22
Allen-Bradley HMIs

2ControlLogix Redundant Power Supply
Publication 1756-IN573C-EN-P - October 2003
Important User Information
Solid state equipment has operational characteristics differing from those of electromechanical equipment.
Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (Publication
SGI-1.1 available from your local Rockwell Automation sales office or online at
http://www.ab.com/manuals/gi) describes some important differences between solid state equipment and
hard-wired electromechanical devices. Because of this difference, and also because of the wide variety of
uses for solid state equipment, all persons responsible for applying this equipment must satisfy themselves
that each intended application of this equipment is acceptable.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages
resulting from the use or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many
variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot
assume responsibility or liability for actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits,
equipment, or software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell
Automation, Inc. is prohibited.
Throughout this manual we use notes to make you aware of safety considerations.
WARNING Identifies information about practices or circumstances that can cause an explosion in a
hazardous environment, which may lead to personal injury or death, property damage,
or economic loss.
IMPORTANT Identifies information that is critical for successful application and understanding of the
product.
ATTENTION Identifies information about practices or circumstances that can lead to personal injury
or death, property damage, or economic loss. Attentions help you:
•identify a hazard
•avoid a hazard
•recognize the consequence
SHOCK HAZARD Labels may be located on or inside the drive to alert people that dangerous voltage may
be present.
BURN HAZARD Labels may be located on or inside the drive to alert people that surfaces may be
dangerous temperatures.

ControlLogix Redundant Power Supply 3
Publication 1756-IN573C-EN-P - October 2003
Environment and Enclosure
Prevent Electrostatic Discharge
ATTENTION This equipment is intended for use in a Pollution Degree 2 industrial environment, in
overvoltage Category II applications (as defined in IEC publication 60664-1), at altitudes
up to 2000 meters without derating.
This equipment is considered Group 1, Class A industrial equipment according to
IEC/CISPR Publication 11. Without appropriate precautions, there may be potential
difficulties ensuring electromagnetic compatibility in other environments due to
conducted as well as radiated disturbance.
This equipment is supplied as "open type" equipment. It must be mounted within an
enclosure that is suitably designed for those specific environmental conditions that will
be present and appropriately designed to prevent personal injury resulting from
accessibility to live parts. The interior of the enclosure must be accessible only by the
use of a tool. Subsequent sections of this publication may contain additional
information regarding specific enclosure type ratings that are required to comply with
certain product safety certifications.
NOTE: See NEMA Standards publication 250 and IEC publication 60529, as applicable,
for explanations of the degrees of protection provided by different types of enclosure.
Also, see the appropriate sections in this publication, as well as the Allen-Bradley
publication 1770-4.1 ("Industrial Automation Wiring and Grounding Guidelines"), for
additional installation requirements pertaining to this equipment.
ATTENTION This equipment is sensitive to electrostatic discharge, which can cause internal
damage and affect normal operation. Follow these guidelines when you handle this
equipment:
•Touch a grounded object to discharge potential static.
•Wear an approved grounding wriststrap.
•Do not touch connectors or pins on component boards.
•Do not touch circuit components inside the equipment.
•If available, use a static-safe workstation.
•When not in use, store the equipment in appropriate static-safe packaging.
Allen-Bradley HMIs

4ControlLogix Redundant Power Supply
Publication 1756-IN573C-EN-P - October 2003
European Zone 2 Certification
If you use this product in a European Zone 2 location, consider:
European Zone 2 Certification
This equipment is intended for use in potentially explosive atmospheres as defined by European Union
Directive 94/9/EC.
The LCIE (Laboratoire Central des Industries Electriques) certifies that this equipment has been found to
comply with the Essential Health and Safety Requirements relating to the design and construction of Category
3 equipment intended for use in potentially explosive atmospheres, given in Annex II to this Directive. The
examination and test results are recorded in confidential report No. 28 682 010.
Compliance with the Essential Health and Safety Requirements has been assured by compliance with EN
50021.
IMPORTANT When using this product, also consider the following:
•This equipment is not resistant to sunlight or other sources of UV radiation.
•The secondary of a current transformer shall not be open-circuited when
applied in Class I, Zone 2 environments.
•Equipment of lesser Enclosure Type Rating must be installed in an enclosure
providing at least IP54 protection when applied in Class I, Zone 2
environments.
•This equipment shall be used within its specified ratings defined by
Allen-Bradley.
•Provision shall be made to prevent the rated voltage from being exceeded by
transient disturbances of more than 40% when applied in Class I, Zone 2
environments.
WARNING If you connect or disconnect wiring while power is on, an elec-
trical arc can occur. This could cause an explosion in hazardous
location installations. Be sure that power is removed or the area
is nonhazardous before proceeding.

ControlLogix Redundant Power Supply 5
Publication 1756-IN573C-EN-P - October 2003
North American Hazardous Location Approval
The following information applies when
operating this equipment in hazardous locations:
Informations sur l’utilisation de cet équipement
en environnements dangereux :
Products marked “CL I, DIV 2, GP A, B, C, D” are
suitable for use in Class I Division 2 Groups A, B, C, D,
Hazardous Locations and nonhazardous locations only.
Each product is supplied with markings on the rating
nameplate indicating the hazardous location
temperature code. When combining products within a
system, the most adverse temperature code (lowest
“T” number) may be used to help determine the overall
temperature code of the system. Combinations of
equipment in your system are subject to investigation
by the local Authority Having Jurisdiction at the time
of installation.
Les produits marqués "CL I, DIV 2, GP A, B, C, D" ne
conviennent qu’à une utilisation en environnements
de Classe I Division 2 Groupes A, B, C, D dangereux et
non dangereux. Chaque produit est livré avec des
marquages sur sa plaque d’identification qui
indiquent le code de température pour les
environnements dangereux. Lorsque plusieurs
produits sont combinés dans un système, le code de
température le plus défavorable (code de température
le plus faible) peut être utilisé pour déterminer le
code de température global du système. Les
combinaisons d’équipements dans le système sont
sujettes à inspection par les autorités locales
qualifiées au moment de l’installation.
WARNING EXPLOSION HAZARD
•Do not disconnect
equipment unless power
has been removed or the
area is known to be
nonhazardous.
•Do not disconnect
connections to this
equipment unless power
has been removed or the
area is known to be
nonhazardous. Secure any
external connections that
mate to this equipment by
using screws, sliding
latches, threaded
connectors, or other
means provided with this
product.
•Substitution of
components may impair
suitability for Class I,
Division 2.
•If this product contains
batteries, they must only
be changed in an area
known to be
nonhazardous.
AVERTISSEMENT RISQUE D’EXPLOSION
•Couper le courant ou
s’assurer que
l’environnement est
classé non dangereux
avant de débrancher
l'équipement.
•Couper le courant ou
s'assurer que
l’environnement est
classé non dangereux
avant de débrancher les
connecteurs. Fixer tous
les connecteurs
externes reliés à cet
équipement à l'aide de
vis, loquets coulissants,
connecteurs filetés ou
autres moyens fournis
avec ce produit.
•La substitution de
composants peut rendre
cet équipement
inadapté à une
utilisation en
environnement de
Classe I, Division 2.
•S’assurer que
l’environnement est
classé non dangereux
avant de changer les
piles.
Allen-Bradley HMIs

6ControlLogix Redundant Power Supply
Publication 1756-IN573C-EN-P - October 2003
Description of the Redundant Power Supply
These supplies are part of a redundant power supply system that provides
additional uptime protection for a chassis used in critical applications. The two
remotely-mounted supplies are designed to share the current required by the
chassis. They are available in AC (1756-PA75R/A) and DC (1756-PB75R/A) versions
that can be mixed or matched when used in tandem.
In the event of a failure by one redundant power supply, the remaining supply will
accommodate the entire load of the chassis without disruption to chassis activity.
Overview of the Installation Process
Follow these steps when installing and powering your Redundant Power
Supply system.
1. Allow Sufficient Mounting Space
2. Install Your Redundant Power Supply
3. Ground Your Redundant Power Supply
4. Connect the Cable to the Redundant Power Supply and the Chassis Adapter
Module
5. Connect Solid State Relay
6. Connect Power
7. Activate the Redundant Power Supply System
The steps are described in detail, along with other important information,
throughout this installation instructions.
Prepare for Installation
You need the tools shown below to install a ControlLogix redundant power supply.
Figure 1
1/8” slotted screwdriver
1/4” slotted (#2) or
phillips screwdriver
torque screwdriver
needle-nose pliers
wire stripper
42654
electric drill

ControlLogix Redundant Power Supply 7
Publication 1756-IN573C-EN-P - October 2003
Identify the Components of a Redundant Power Supply System
The components are shown below in a typical system configuration:
Figure 2
Table 1 Redundant Power Supply System Components
Catalog Number Description Quantity
1756-PA75R/A and/or
1756-PB75R/A
Redundant power supply 2
1756-CPR2 Redundant power supply cables
(Length = 0.91m [3ft])
2
1756-PSCA2 Redundant power supply chassis
adapter module
1
User-supplied(1)
(1) Optional user-provided annunciator wiring can be connected to the solid state relay for status and troubleshooting
purposes. For more information, see pages 15 and 20.
Annunciator wiring
(Maximum length = 10m [32.8ft])
2
1756-PA75R/A 1756-PA75R/A
1756-CPR2
1756-PSCA2
42655
Annunciator wiring
1756 Input module
Allen-Bradley HMIs

8ControlLogix Redundant Power Supply
Publication 1756-IN573C-EN-P - October 2003
Recognize Redundant Power Supply Physical Features
Your redundant power supply has multiple physical features as shown below.
Figure 3
Table 2 Redundant Power Supply Physical Features
Physical Feature Description
Plastic barrier The barrier separates the input power cable from the annunciator cable.
Male cable connector The cable connector accommodates the female end of the 1756-CPR2 cable
and connects power to the chassis. For more information, see page 14.
Diagnostic status indicators There are two indicators:
•Power
•Non-Red (Nonredundancy)
For more information on the status indicators, see page 20.
ON/OFF switch Switch that turns the backplane power ON and OFF at the connected
chassis. (Up is the ON position.)
Solid state relay connections These contacts allow optional failure annunciation when wired to a
standard input module. The solid state relay contacts are normally open, but
held closed during normal operation. For more information on these
connections, see page 15.
Power input connections These connections allow you to wire input power to the redundant power
supply. For more information on these connections, see page 16.
42656
Diagnostic LEDs
ON/OFF switch
Solid state relay
connections
Male cable
connector
Supply shown
without door
or label.
Plastic barrier
Power input
connections

ControlLogix Redundant Power Supply 9
Publication 1756-IN573C-EN-P - October 2003
Use System Set-up Recommendations
We recommend you use one of the methods shown below when setting up your
redundant power supply system.
Figure 4
Recommended Set-Ups for System Using One Chassis
Recommended Set-Ups for System Using Two Chassis
42655
42655
42655
42657
42658
Allen-Bradley HMIs

10 ControlLogix Redundant Power Supply
Publication 1756-IN573C-EN-P - October 2003
Allow Sufficient Mounting Space
Figure 5
For more information on spacing requirements between chassis, see the
ControlLogix Chassis Installation Instructions, publication number 1756-IN080.
IMPORTANT Make sure you meet these minimum spacing requirements:
•10.2cm (4in) between redundant power supplies and
cabinet housing the control system
•2.55cm (1in) between redundant power supplies
•15.3cm (6in) between chassis and heat source
•5.1cm (2in) between wireway and top or bottom of chassis
•5.1cm (2in) between wireway and power supply
42667
10.2cm
(4in)
2.55cm
(1in)
10.2cm
(4in)
15.3cm
(6in)
10.2cm
(4in) 5.1cm (2in)
5.1cm (2in) Wireway
Table 3 lists the widths of each ControlLogix
chassis type with a Redundant Power Supply
Chassis Adapter module installed. Keep these
widths in mind when mounting your chassis.
Table 3 Width of Chassis with Redundant
Power Supply Chassis Adapter Module
Installed
Catalog
Number:
Total Width:
1756-A4 18.5cm (7.30in)
1756-A7 29.0cm (11.44in)
1756-A10 40.5cm (15.96in)
1756-A13 51.0cm (20.10in)
1756-A17 66.0cm (26.0in)
15.3cm
(6in)
15.3cm
(6in)
10.2cm
(4in)

ControlLogix Redundant Power Supply 11
Publication 1756-IN573C-EN-P - October 2003
Install Your Redundant Power Supply
1. Use the mounting dimensions in Figure 6.
Figure 6
The 1756-PA75R/A and 1756-PB75R/A power supplies use the same
mounting dimensions as the 1756-A4 chassis.
2. Drill holes in the back panel of the enclosure for redundant power supply
mounting tabs.
Figure 7
ATTENTION Do not drill holes for a redundant power supply above
installed equipment (e.g. chassis). Metal chips from drilling
can damage the backplane and cause intermittent operation.
42668
15.8cm
(6.22in)
7.0cm
(2.76in)
17.5cm
(6.88in)
1.1cm
diameter
(0.433in)
0.55cm
diameter
(0.217in)
0.55cm
diameter
(0.217in)
14.4cm
(5.66in)
1756-PA75R/A and
1756-PB75R/A power
supplies use the same
mounting dimensions as
the 1756-A4 chassis.
20288
Allen-Bradley HMIs

12 ControlLogix Redundant Power Supply
Publication 1756-IN573C-EN-P - October 2003
3. Install the hardware for the top mounting tabs.
Figure 8
4. Slide the redundant power supply over the installed screws and
tighten them.
Figure 9
5. Install the remaining tab screw(s).
Figure 10
42664
#10 phillips screw
42659
31175

ControlLogix Redundant Power Supply 13
Publication 1756-IN573C-EN-P - October 2003
Ground Your Redundant Power Supply
The figure below shows how to run functional and equipment protective earth
ground connections from the chassis and power supplies to the ground bus.
For specific information on how to connect ground wiring to the redundant power
supply, see page 16. For specific information on how to connect ground wiring to
the chassis, see the ControlLogix chassis installation instructions, publication
1756-IN080.
We recommend the following:
•Use a ground bus to reduce the electrical resistance at the connection.
•Keep wire lengths as short as possible.
•Use 14 AWG (2.08 sq. mm) 75°C stranded wire for ground connections.
Figure 11
42661
Earth Ground
Allen-Bradley HMIs

14 ControlLogix Redundant Power Supply
Publication 1756-IN573C-EN-P - October 2003
Connect the Cable to the Redundant Power Supply and the
Chassis Adapter Module
Use the 1756-CPR2 cable to connect your redundant power supply to the chassis
adapter module. The 1756-CPR2 cable uses two female ends to connect to male
connectors on the redundant power supply and the chassis adapter module.
1. Leave a minimum of 4 in (10.2 cm) space between the left side of the chassis
adapter module and the cabinet housing your system. The 1756-CPR2 cable
will not connect to the module in less than 4 in (10.2 cm) of space.
2. Connect the male end of the 1756-CPR2 cable to the chassis adapter module.
Figure 12
3. Connect the female end of the 1756-CPR2 cable to the redundant
power supply.
Figure 13
4. Tighten the screws to hold the cable in place. Make sure you tighten the
screws all the way to hold the cable in place for the life of the product.
For recommendations on how to route the wiring in your redundant power supply
application, see page 17.
ATTENTION Make sure the redundant power supply is turned off before
connecting the 1756-CPR2 cables to the power supply.
31176-M
31174-M

ControlLogix Redundant Power Supply 15
Publication 1756-IN573C-EN-P - October 2003
Connect Solid State Relay
A solid state relay on your redundant power supplies can be connected to an input
module. This connection monitors whether the supplies are functioning properly.
When using the solid state relay, you must wire a source voltage that is compatible
with the input module to either contact terminal and then connect the other
terminal to the input point.
The relays are closed during standard operation. The solid state relay contacts open
in any of the following conditions:
•If one or both of the supplies fail. In this case, the contact open on the failed
supply (ies), and the input module alerts you to the failure through the
controller program.
•The connected redundant power supplies are turned OFF.
Use Figure 14 to wire the solid state relay on your redundant power supply.
Figure 14
The annunciator cable must not exceed 10 meters (32.8 feet). For recommendations
on how to route the wiring in your redundant power supply application, see
page 17.
ATTENTION The annunciator output is rated for resistive loads. It should
not be used to drive the coil of an electromagnetic relay.
42663
Connection to input module
Source voltage
Screws
Make sure you tighten the
screws on either side of the
plug to make sure it is
completely mated to the
power supply through the
life of the product.
Allen-Bradley HMIs

16 ControlLogix Redundant Power Supply
Publication 1756-IN573C-EN-P - October 2003
Connect Power
We recommend using #14 AWG (2.08 sq. mm) 75°C copper stranded wire to
connect power to each redundant power supply. The diagrams below show how to
connect power to the redundant power supply. Tighten the connection terminals to
a torque of 7 inch-pounds (0.79Nm).
Figure 15
ATTENTION Turn off power lines before connecting power; failure to do so
could cause injury to personnel and/or equipment. This
equipment must be provided with a disconnect on each
ungrounded conductor.
IMPORTANT For recommendations on how to route the wiring in your
redundant power supply application, see page 17.
42662
1756-PA75R/A
(AC source wiring)
L2/N
L1
(GND)
IMPORTANT: Tighten the screws on
either side of the plug
to make sure it is
completely mated to
the power supply
through the life of the
product.
Do not use unmarked terminals.
•If you are using AC source
wiring, only connect wires to
L1, L2/N and GND.
•If you are using DC source
wiring, only connect wires to
DC+, DC- and GND.
The DC source wiring to the
1756-PB75R supply must not
exceed 10 meters (32.8 feet).
Screws
1756-PB75R/A
(DC source wiring)
42662
DC–
(GND)
DC+
Screws

ControlLogix Redundant Power Supply 17
Publication 1756-IN573C-EN-P - October 2003
Route Line Power and Cables
Follow the guidelines below when wiring a redundant power supply.
•Never run all three lines together in any application. For example, do not
run input power, output power (1756-CPR2) and annunciator cable together.
•If the redundant power supply and the annunciator cable use the same input
power source, you can route the power line and annunciator cable together.
For example, if your application uses a DC redundant power supply and the
annunciator cable is connected to a DC input module, you can route the
power source line and annunciator cable together, as shown in Figure 16.
Figure 16
•If the redundant power supply and the annunciator cable use different input
power sources, you must route the power line and annunciator cable
separately. For example, if your application uses an AC redundant power
supply and the annunciator is connected to a DC input module, you must
route the power source line and annunciator separately, as shown in
Figure 17.
Figure 17
To DC input
power
Annunciator cable
to DC input module
Output power
(1756-CPR2) to chassis
42832
To AC input power
Annunciator cable
to DC input module
Output power
(1756-CPR2) to chassis 42833
Plastic barrier
In this case, make sure you tuck the annunciator
wiring under the tab at the top of the plastic barrirer.
Allen-Bradley HMIs

18 ControlLogix Redundant Power Supply
Publication 1756-IN573C-EN-P - October 2003
Remove the Protective Label
Pull the label off the power supply.
Figure 18
Activate the Redundant Power Supply System
After you have installed the power supplies and connected them to the appropriate
chassis adapter module, flip the switch ON each supply to power the system.
Figure 19
ATTENTION Make sure the power supply is mounted and all panel
fabrication is complete before you remove the protective label.
This label protects the power supply from metal shavings
falling inside the power supply.
42841
42666
I
POWER
0

ControlLogix Redundant Power Supply 19
Publication 1756-IN573C-EN-P - October 2003
Input Power Requirements and Transformer Sizing
With the graphs in Figure 20, you can:
•Use the real power value in watts to determine the amount of heat
dissipation you will have inside the enclosure.
•User the appropriate power value in VA to estimate power
distribution sizing.
•Use the transformer load value in VA of each power supply plus all other
loads on a transformer to determine the required transformer size.
Use the graphs in Figure 20 to determine the input power requirements for the
supplies, given the power they are providing to the modules in the chassis. The
vertical axis of each graph shows the backplane power consumed by all of the
modules in the chassis; the horizontal axis shows input power requirements of the
power supply. To use the graphs:
1. Add all of the backplane power (i.e. watts) for all of the modules in
the chassis.
2. Find the number from step 1 on the vertical axis.
3. Follow that value to the right until it intersects the line on the graph.
4. Find the associated input power rating consumed by the power supply on
the horizontal axis.
For example, if the power consumption of all of the modules in the chassis is
30 watts, a 1756-PB75R consumed approximately 50 watts of Real Power.
Figure 20
Power factor circuitry reduces transformer sizing requirements.
apparent power (Watts)
transformer load (VA) = real power (Watts)
and
real power (Watts)
backplane
power load
(Watts)
real power (Watts)
backplane
power load
(Watts)
1756-PA75R/A (ac)
1756-PB75R/A (dc)
43588
43589
Allen-Bradley HMIs

20 ControlLogix Redundant Power Supply
Publication 1756-IN573C-EN-P - October 2003
Troubleshoot with the Status Indicators
Your redundant power supply uses the following diagnostic status indicators (LEDs)
•Power - Green
•Non-red (non-redundancy) - Amber
to display possible problems with the supply. At initial power-up, the Power
indicator is illuminated.
Table 4 explains the diagnostic indicators and how you can use them to
troubleshoot your redundant power supplies.
Table 4 Using Status Indicators to Troubleshoot Your Redundant Power Supply
This comibination of
status indicators:
Means: Take this action:
Power - Solid green
Non-red - Off
Both supplies are operating properly. None
Power - Solid green
Non-red - Solid amber
This supply is operating properly but
is the only supply providing power to
the chassis adapter module.
Check the other supply.
Power - OFF
Non-red - Solid amber
All possible connections are made,
but the redundant power supply is
turned OFF.
Turn the supply ON. If the supply does not
turn ON, follow these steps:
1. Remove input power to supply
2. Wait 15 seconds
3. Reconnect input power
4. Turn supply ON. If the supply still
does not turn ON, replace it.
Power - OFF
Non-red - OFF
Any of the following conditions
may apply:
1. The supply is turned OFF.
2. Line voltage is not within
the specified range.
3. All connections are made,
but input power is not
supplied.
4. All connections are made,
including input power, but
output cable (1756-CPR2) is
not connected.
5. The supply is ON but
defective.
Take the appropriately numbered action for
each condition:
1. Turn the supply ON.
2. Verify that line power is in the
specified range. If the indicators
remain OFF, cycle power.
3. Verify that input power is supplied
and turn the supply ON.
4. Connect output cable and turn the
supply ON.
5. Replace the supply.