Allen-Bradley 1734-EP24DC User manual

Installation Instructions
POINT I/O 24V DC Expansion
Power Supply
Catalog Numbers 1734-EP24DC, Series B
Table of Contents
Topic Page
Important User Information 2
Environment and Enclosure 3
Prevent Electrostatic Discharge 3
North American Hazardous Location Approval 5
European Hazardous Location Approval 6
About the Power Supply 7
Install the Power Supply 8
Remove the Power Supply 8
Wire the Power Supply 9
Specifications 13

2 POINT I/O 24V DC Expansion Power Supply
Publication 1734-IN058C-EN-P - October 2015
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.rockwellautomation.com/literature/) 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.
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.
IMPORTANT Identifies information that is critical for successful application and understanding of
the product.

POINT I/O 24V DC Expansion Power Supply 3
Publication 1734-IN058C-EN-P - October 2015
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 (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.

4 POINT I/O 24V DC Expansion Power Supply
Publication 1734-IN058C-EN-P - October 2015
WARNING: When you insert or remove the module while backplane 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. Repeated electrical arcing causes
excessive wear to contacts on both the module and its mating connector.
Worn contacts may create electrical resistance that can affect module
operation.
WARNING: If you connect or disconnect the communication cable with
power applied to this module or any device on the network, an electrical arc
can occur. This could cause an explosion in hazardous location installations.
ATTENTION: To comply with the CE Low Voltage Directive (LVD), field power
and all connected I/O must be powered from a source compliant with the
following:
Safety Extra Low Voltage (SELV) or Protected Extra Low Voltage (PELV).
ATTENTION: If this equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be impaired.
ATTENTION: To comply with UL restrictions, field power and all connected
devices must be powered from a single source compliant with the following:
Class 2.
ATTENTION: POINT I/O is grounded through the DIN rail to chassis ground.
Use zinc plated yellow-chromate steel DIN rail to assure proper grounding. The
use of other DIN rail materials (for example, aluminum, plastic) that can
corrode, oxidize, or are poor conductors, can result in improper or intermittent
grounding. 
Secure DIN rail to mounting surface approximately every 200 mm (7.8 in.) and
use end-anchors appropriately.

POINT I/O 24V DC Expansion Power Supply 5
Publication 1734-IN058C-EN-P - October 2015
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.
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.
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.

6 POINT I/O 24V DC Expansion Power Supply
Publication 1734-IN058C-EN-P - October 2015
European Hazardous Location Approval
The following applies when the product bears the Ex Marking
This equipment is intended for use in potentially explosive atmospheres as defined by European Union
Directive 94/9/EC.
DEMKO 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 Zone 2
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
60079-0:2012+A11:2013, EN 60079-15:2010, reference certificate number DEMKO 04ATEX0330347X.
WARNING: This equipment shall be mounted in an ATEX certified enclosure
with a minimum ingress protection rating of at least IP54 (as defined in
IEC60529) and used in an environment of not more than Pollution Degree 2
(as defined in IEC 60664-1) when applied in Zone 2 environments. The
enclosure must utilize a tool removable cover or door.
WARNING: This equipment shall be used within its specified ratings defined
by Rockwell Automation.
WARNING: Provision shall be made to prevent the rated voltage from being
exceeded by transient disturbances of more than 140% of the rated voltage
when applied in Zone 2 environments.
WARNING: This equipment must be used only with ATEX certified Rockwell
Automation backplanes.
WARNING: Secure any external connections that mate to this equipment by
using screws, sliding latches, threaded connectors, or other means provided
with this product.
WARNING: Do not disconnect equipment unless power has been removed or
the area is known to be nonhazardous.
WARNING: The secondary of a current transformer shall not be
open-circuited when applied in Class I, Zone 2 environments.
ATTENTION: This equipment is not resistant to sunlight or other sources of
UV radiation.
ATTENTION: Do not connect 120/240V AC power to this supply.
ATTENTION: Use the 1734-EP24DC expansion power supply only with 1734
POINT I/O adapters, such as the 1734-ADN DeviceNet adapter.

POINT I/O 24V DC Expansion Power Supply 7
Publication 1734-IN058C-EN-P - October 2015
About the Power Supply
The expansion power supply passes 24V DC field power to the I/O modules to the right
of it. The expansion power supply extends the backplane bus power for up to 17 I/O
modules to the right of the supply and creates a new field voltage partition segment for
driving field devices. The expansion power supply separates field power from I/O modules
to the left of the unit, effectively providing functional and logical partitioning for the
following.
• Separate field power between input and output modules.
• Separate field power to the analog and digital modules.
• Group modules to perform a specific task or function.
The dark-gray color of the expansion power supply allows for easy visual inspection and
identification. Refer to the figure to identify external power supply components.
Use multiple expansion power supplies with POINT I/O adapters to assemble a full
system. With any POINT I/O adapter, use an expansion power supply to add additional
modules in 4…17 module increments, for a total of 63 I/O modules.
Interlocking
side pieces
Module
label
DIN rail locking
screw (orange)
RTB removal
handle
Removable
Terminal
Block (RTB)
43970

8 POINT I/O 24V DC Expansion Power Supply
Publication 1734-IN058C-EN-P - October 2015
Install the Power Supply
To install the expansion power supply on the DIN rail, proceed as follows.
1. Position the power supply vertically above the DIN rail.
2. Engage the interlocking side pieces with the unit on the left.
3. Press down firmly to install the power supply on the DIN rail.
The locking mechanism locks the module to the DIN rail.
Remove the Power Supply
To remove an expansion power supply, proceed as follows.
1. Pull up on the RTB removal handle to remove the terminal block.
2. Remove the module to the right of the 1734-EP24DC module from its base unit.
3. Use a small-bladed screwdriver to rotate the DIN rail locking screw to a vertical
position.
This releases the locking mechanism.
4. Lift straight up to remove.
Replace the Power Supply
To install a replacement expansion power supply, proceed as follows.
1. Remove the module to the right of the power supply from its base unit.
2. Position the power supply vertically above the DIN rail.
42511

POINT I/O 24V DC Expansion Power Supply 9
Publication 1734-IN058C-EN-P - October 2015
3. Slide the power supply down allowing the interlocking side pieces to engage the
adjacent modules (both left and right sides).
4. Press firmly to seat the power supply on the DIN rail. 
The power supply locking mechanism snaps into place.
5. Reinsert the module into the base next to the expansion power supply.
Wire the Power Supply
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.
ATTENTION: Use the 1734-EP24DC expansion power supply only with
adapter class products.
ATTENTION: Use the 1734-EP24DC expansion power supply only with 1734
POINT I/O adapters, such as the 1734-ADN DeviceNet adapter.
NC = No Connection
CHAS GND = Chassis Ground
C = Common
V = Supply 41970
NC
C
VV
NC
CHAS GNDCHAS GND
C

10 POINT I/O 24V DC Expansion Power Supply
Publication 1734-IN058C-EN-P - October 2015
12/24V DC Wiring
Connect Terminal Terminals (for continuing power)
+V DC 6 7
-V DC 4 5
Chas Gnd 2 3
12/24V DC becomes the internal field power bus for modules to the right.
NC NC
C
VV
C
CHAS
GND
V DC
This supply will be
connected to the internal
field power bus.
43960
V = 12/24V DC C = Common 
CHAS GND = Chassis Ground
3
5
7
01
2
4
6
12/24V DC
CHAS
GND
Do not connect 120/240V AC
power to this supply.