Rockwell Automation ControlLogix 1756-PA72 Series C User manual

Installation Instructions
ControlLogix Power Supplies
Catalog Numbers 1756-PA72 Series C, 1756-PB72
Series C, 1756-PA75 Series B, 1756-PB75 Series B,
1756-PH75 Series B, 1756-PC75 Series B
About the Power Supplies
ControlLogix power supplies are used with the 1756 chassis to provide 1.2V, 3.3V, 5V, and
24V DC power for all modules installed in the chassis. The non-redundant power supplies are
mounted on the left end of the chassis, where they are plugged directly into the backplane.
Topic Page
Important User Information 2
Environment and Enclosure 3
Safety-related Programmable Electronic Systems 4
North American Hazardous Location Approval 4
European Hazardous Location Approval 5
Before You Begin 5
Install the Power Supply 6
Ground the Power Supply at Protective Earth Ground 8
Connect the Power 10
Remove the Protective Label 11
Activate the Power Supply 12
Determine the Input Power Requirements/Transformer Sizing 12
Status Indicators 14
Specifications 15
Additional Resources 23

2ControlLogix Power Supplies
Publication 1756-IN613A-EN-P - December 2008
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://literature.rockwellautomation.com) 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, when necessary, 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 and recognize the consequences.
SHOCK HAZARD
Labels may be on or inside the equipment (for example, drive or motor) to alert people
that dangerous voltage may be present.
BURN HAZARD
Labels may be on or inside the equipment (for example, drive or motor) to alert people
that surfaces may reach dangerous temperatures.

ControlLogix Power Supplies 3
Publication 1756-IN613A-EN-P - December 2008
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 m (6562 ft) 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 enclosure must have suitable flame-retardant properties to
prevent or minimize the spread of flame, complying with a flame spread rating of 5VA,
V2, V1, V0 (or equivalent) if non-metallic. 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.
In addition to this publication, see:
•Industrial Automation Wiring and Grounding Guidelines, for additional installation
requirements, Allen-Bradley publication 1770-4.1.
•NEMA Standards publication 250 and IEC publication 60529, as applicable, for
explanations of the degrees of protection provided by different types of enclosure.
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.
•Use a static-safe workstation, if available.
•Store the equipment in appropriate static-safe packaging when not in use.

4ControlLogix Power Supplies
Publication 1756-IN613A-EN-P - December 2008
Safety-related Programmable Electronic Systems
North American Hazardous Location Approval
ATTENTION Personnel responsible for the application of safety-related programmable electronic
systems (PES) shall be aware of the safety requirements in the application of the system
and shall be trained in using the system.
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
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.

ControlLogix Power Supplies 5
Publication 1756-IN613A-EN-P - December 2008
European Hazardous Location Approval
Before You Begin
Before you attempt to install a power supply, make sure you have the required tools.
Required Tools
•1/8” slotted screwdriver
•1/4” slotted (#2) or Phillips screwdriver
•Torque screwdriver
•Needle-nose pliers
•Crimping tool
1756-PB72 Series C, 1756-PB75 Series B (only)
European Zone 2 Certification (The following applies when the product bears the Ex or EEx
Marking)
This equipment is intended for use in potentially explosive atmospheres as defined by European Union
Directive 94/9/EC and 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.
Compliance with the Essential Health and Safety Requirements has been assured by compliance with
EN 60079-15 and EN 60079-0.
WARNING •This equipment must be installed in an enclosure providing at least IP54 protection
when applied in Zone 2 environments.
•This equipment shall be used within its specified ratings defined by Allen-Bradley.
•Provisions shall be made to prevent the rated voltage from being exceeded by
transient disturbances of more than 40% when applied in Zone 2 environments.
•This equipment must be used only with ATEX certified backplanes.
•Secure any external connections that mate to this equipment by using screws, sliding
latches, threaded connectors, or other means provided with this product.
•Do not disconnect equipment unless power has been removed or the area is known to
be nonhazardous.
ATTENTION This equipment is not resistant to sunlight or other sources of UV radiation.

6ControlLogix Power Supplies
Publication 1756-IN613A-EN-P - December 2008
Install the Power Supply
The chassis series you have determines what power supply you can use. The following table
lists the chassis that is to be installed with a respective power supply.
Follow these steps to install the power supply.
1. Align the power-supply circuit board with the card guides on the left side of the
chassis.
2. Guide the extended tab on the power-supply circuit board into the notch of the
chassis.
Chassis Compatibility
Power Supply Cat. No. Chassis Cat. No.
1756-PA72 Series C 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17
Series A, B
1756-PB72 Series C
1756-PA75 Series B
1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17
Series B only
1756-PB75 Series B
1756-PC75 Series B
1756-PH75 Series B
20264a-M
43614
Notch

ControlLogix Power Supplies 7
Publication 1756-IN613A-EN-P - December 2008
3. Slide the power supply in until it is flush with the back of the chassis.
4. Fasten the power supply to the chassis.
44144
44145

8ControlLogix Power Supplies
Publication 1756-IN613A-EN-P - December 2008
Ground the Power Supply at Protective Earth Ground
The following steps describe how to connect the equipment-protective earth ground from
the power supply to the chassis.
1. Connect the equipment-protective earth ground from the power supply to the chassis.
2. Connect the protective-earth ground from the chassis to the system earth ground.
3. Tighten the nut on the equipment-protective earth ground terminal stud to a torque
of 1.4 N•m (12 lb•in).
Item Description
1 Wiring terminal block
2 Protective earth-ground terminal stud
3 Nut with captive star washer
4Equipment grounding conductor (ground lug with 2.1 mm2[14 AWG] wire) protective earth ground
from wiring terminal block to chassis
5 Nut with captive star washer
6Equipment grounding conductor (ground lug with 2.1 mm2[14 AWG] wire) protective earth ground
from chassis to ground bus
6
4
1
2
3
5
44146

ControlLogix Power Supplies 9
Publication 1756-IN613A-EN-P - December 2008
Verify the Grounding Configuration
Before continuing, verify that the Protective and Functional Earth grounds are connected to
the system. We recommend that you use a ground bus to reduce the electrical resistance at the
connection.
For more information on grounding the wiring to the ControlLogix chassis, refer to the
ControlLogix Chassis–Series B Installation Instructions, publication 1756-IN080.
TIP Keep wire lengths as short as possible.
20231a-M
Functional Earth Ground
Earth Ground
Protective Earth Ground

10 ControlLogix Power Supplies
Publication 1756-IN613A-EN-P - December 2008
Connect the Power
Use 2.5 mm2(14 AWG) 75 °C (167 °F) copper wire with 1.2 mm (3/64-in.) insulation to
connect power. Follow these steps for each wire (high side (L1), low side (L2/N), and
ground) to connect power.
1. Turn the screw counterclockwise to open the wiring terminal.
WARNING If you connect or disconnect wiring while the field-side power is on, an electrical 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.
IMPORTANT The third terminal from the top (between low side and ground) is not used on the 1756
power supplies.
43894
1756-PA72 Series C, 1756-PA75 Series B
43632
1756-PB72 Series C, 1756-PB75 Series B,
1756-PH75 Series B, 1756-PC75 Series B
1
2
4
5
3a
3b
(AC Power Supplies)
(DC Power Supplies)