Rockwell Automation 1738-EP24DC User Manual

Installation Instructions

ArmorPoint I/O 24V dc Expansion Power
Supply, Series A

(Cat. No. 1738-EP24DC)

24V dc Expansion
Power Supply

Wire marker

Mini connector

1738-EP24DC

24V dc Power Supply

P
O

A

W

U

E

X

R

System

Power

Field

Power

LED
Indicators

43770

The 24V dc expansion power supply unit (Cat. no. 1738-EP24DC)
passes 24V dc field power to the I/O modules to the right of the
power supply. This unit extends the backplane bus power for up to
17 I/O modules to the right of the supply and
voltage partition.

creates a new field

The expansion power supply also separates field power from I/O
modules to the left of the unit, effectively providing functional and
logical partitioning for:

• separating field power between input and output modules

• separating field power to the analog and digital modules

• grouping modules to perform a specific task or function

Y ou can use multiple expansion powe r units with the ArmorPoint I/O
adapters to assemble a full system. For instance, if you are using the
1738-ADN adapter, you may use a 1738-EP24DC expansion power
unit to add additional modules in 5 to 17 module increments. For
example, if you had a 36 module system with a 1738 ArmorPoint I/O
adapter, you would have two 1738-EP24DC expansion power units to
provide more PointBus current for modules to the right of the supply.

1 Publication 1738-IN020A-EN-E - June 2004

2 ArmorPoint I/O 24V dc Expansion Power Supply, Series A

ATTENTION

Do not connect 120/240V ac to the 1738-EP24DC
terminals. Damage to the supply will result.

ATTENTION

Y ou can only use the 1738-EP24DC expansion power
unit with the 1738 ArmorPoint I/O adapters.

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 betwee n 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 liabl e for indirect or consequential damages
resulting from the use or application of th is equipment.

The examples and diagrams in this manual are included solely for illustrati ve 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

Publication 1738-IN020A-EN-E - June 2004

SHOCK HAZARD

Important User Information

Labels may be located on or inside the equipment to alert people that dan gerous
voltage may be present.

ArmorPoint I/O 24V dc Expansion Power Supply, Series A 3

BURN HAZARD

Labels may be located on or inside the equipment to alert people that surfaces may
be dangerous temperatures.

ATTENTION

Environment and Enclosure

This equipment is intended for use in overvoltage
Category II applications (as defined in IEC
publication 60664-1), at altitudes up to 2000 meters
without derating.

This equipment is considered Grou p 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 "enclosed" equipment.
It should not require additional system enclosure
when used in locations consistent with the enclosure
type ratings stated in the Specifications section of this
publication. Subsequent sections of this publication
may contain additional information regarding
specific enclosure type ratings, beyond what this
product provides, 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, se e 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.

Publication 1738-IN020A-EN-E - June 2004