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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
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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
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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.
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4 ArmorPoint I/O 24V dc Expansion Power Supply, Series A
1.9 in.
2.0 in.
0.87 in.
2.0 in.
0.87 in.
2.0 in.
Mount the I/O Base
ATTENTION
Preventing Electrostatic Discharge
This equipment is sensitive to electrostatic dischar ge,
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.
To mount the ArmorPoint I/O base on a wall or panel, use the screw
holes provided in the ArmorPoint base.
Adapter
4.02 in.
102 mm
IMPORTANT
The ArmorPoint I/O module must be mounted on a
grounded metal mounting plate or other conductive
surface.
A mounting illustration for the ArmorPoint base with an adapter is
shown below.
1.81 in.
46 mm
47.2 mm
50 mm
22 mm
50 mm
22 mm
50 mm
43769
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ArmorPoint I/O 24V dc Expansion Power Supply, Series A 5
Install the mounting base as follows:
1. Lay out the required points as shown above in the drilling
dimension drawing.
2. Drill the necessary holes for #8 (M4) machine or self-tapping
screws.
3. Mount the base using #8 (M4) screws.
4. Ground the system using the ground lug connection. (The
ground lug connection is also a mounting hole.)
Install the 24V dc Expansion Power Supply
To install the power supply, proceed as follows.
1. Using a bladed screwdriver, rotate the keyswitch on the
mounting base clockwise until the number 1 aligns with the
notch in the base.
2. Position the power supply vertically above the mounting base.
3. Push the power supply down until it engages the orange
latching mechanism. You will hear a clicking sound when the
power supply is properly engaged.
The locking mechanism will lock the power supply to the base.
Mounting base
KeyswitchSet to position 1
for the 1738 24V
dc expansion
power supply
Ground lug connection
43675
Latching mechanism
To remove the power supply from the mounting base:
1. Put a flat blade screwdriver into the slot of the orange latching
mechanism.
2. Push the screwdriver toward the I/O module to disengage the
latch.
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6 ArmorPoint I/O 24V dc Expansion Power Supply, Series A
3. Pull the module off of the base.
Install a Replacement 1738-EP24DC To an Existing System
1. Remove the module to the right of the power supply from the
2. If you have not done so already, remove the existing power
3. Position the replacement power supply vertically above the
4. Push the power supply down until it engages the orange
The module will lift up off the base.
mounting base.
supply from the mounting base.
mounting base.
latching mechanism. You will hear a clicking sound when the
power supply is properly engaged and locked to the base.
5. Place the module to the right of the power supply back onto the
mounting base.
Wire the 24V dc Expansion Power Supply
Male In Connector
(view into connector)
Pin 1 - User Power +
Pin 2 - Adapter +
Pin 3 - Adapter Pin 4 - User Power -
43587
ATTENTION
Make sure all connectors and caps are securely
tightened to properly seal the connections against
leaks and maintain IP67 requirements.
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ArmorPoint I/O 24V dc Expansion Power Supply, Series A 7
Specifications
1738-EP24DC Power Supply
I/O Module Capacity 5 to 17 I/O modules depending on each module’s current rating.
Power Supply In order to comply with CE Low Voltage Directives (LVD), you must use a Safety
Inputs Voltage Rating 12V dc, 24V dc nominal
Operating Voltage 10-28.8V dc
Input Current, Maximum 6A for 10ms
Backplane Output Current 5V dc, 1.3A
Field Side Power Requirements, Maximum 24V dc (+20% = 28.8V dc) @ 400mA
Indicators 1 Green Field Power Status Indicator
Module Location Between I/O modules in 1738 system
PointBus Output Current 1 A at 10-19.2V input; 1.3 A at 19.2-28.8V input
Input Overvoltage Protection Reverse polarity protected
Interruption Output voltage will stay within specifications when input drops out for 10ms at
General Specifications
Power Consumption, Maximum 9.8W @ 28.8V dc
Power Dissipation, Maximum 3.0W @ 28.8V dc
Thermal Dissipation, Maximum 10.0 BTU/hr @ 28.8V dc
Isolation Voltage
(continuous-voltage withstand rating)
Field Power Bus
Supply Voltage
Voltage Range
Supply Current
Dimensions Inches (Millimeters) 1.25H x 2.63W x 4.25D (31.75H x 66.80W x 107.95D)
Operating Temperature IEC 60068-2-1 (Test Ad, Operating Cold),
Storage Temperature IEC 60068-2-1 (Test Ab, Un-packaged Non-operating Cold),
Relative Humidity IEC 60068-2-30 (Test Db, Un-packaged Non-operating Damp Heat):
Shock IEC60068-2-27 (Test Ea, Unpackaged Shock):
Vibration IEC60068-2-6 (Test Fc, Operating):
ESD Immunity IEC 61000-4-2:
Following are specifications for the 1738-EP24DC power supply.
Extra Low Voltage (SELV) or a Protected Extra Low Voltage (PELV) power supply to
power the adapter.
10-28.8V dc range
1 Green 5V System Power Indicator
Breaks field power bus
10V with maximum load
50V rms
Tested at 1250V ac rms for 60s
12V dc, 24V dc nominal
10-28.8V dc range
10 A maximum
IEC 60068-2-2 (Test Bd, Operating Dry Heat),
IEC 60068-2-14 (Test Nb, Operating Thermal Shock):
-20 to 60°C (-4 to 140°F)
IEC 60068-2-2 (Test Bb, Un-packaged Non-operating Dry Heat),
-40 to 85°C (-40 to 185°F)
5-95% non-condensing
Operating 30g
Non-operating 50g
5g @ 10-500Hz
6kV contact discharges
8kV air discharges
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8 ArmorPoint I/O 24V dc Expansion Power Supply, Series A
General Specifications (continued)
Radiated RF Immunity IEC 61000-4-3:
10V/m with 1kHz sine-wave 80%AM from 30MHz to 2000MHz
10V/m with 200Hz 50% Pulse 100%AM at 900Mhz
10V/m with 200Hz 50% Pulse 100%AM at 1890Mhz
EFT/B Immunity IEC 61000-4-4:
±4kV at 5kHz on power ports
Surge Transient Immunity IEC 61000-4-5:
±1kV line-line(DM) and ±2kV line-earth(CM) on power ports
Conducted RF Immunity IEC 61000-4-6:
10Vrms with 1kHz sine-wave 80%AM from 150kHz to 80MHz
Emissions CSPR 11:
Group 1, Class A
Enclosure Type Rating Meets IP65/66/67 (when marked)
Mounting Base Screw Torque #8 screw, 7.5 in. lbs. in Aluminum, 16 in. lbs. in Steel
Weight 0.637 lb. (0.289 kg)
Wiring Category
1
1 - on power ports
Keyswitch Position 8
Certifications:
(when product is marked)
c-UL-us UL Listed Industrial Control Equipment,
certified for US and Canada
2
CE
European Union 89/336/EEC EMC Directive, compliant with:
EN 61000-6-4; Industrial Emissions
EN 50082-2; Industrial Immunity
EN 61326; Meas./Control/Lab., Industrial Requirements
EN 61000-6-2; Industrial Immunity
C-Tick2Australian Radiocommunications Act, compliant with:
AS/NZS CISPR 11; Industrial Emissions
1. Use this Conductor Category information for planning conductor routing. Refer to publication 1770-4.1, “Industrial Automation Wiring
and Grounding Guidelines”.
2. See the Product Certification link at www.ab.com for Declarations of Conformity, Certificates, and other certification details.
Publication 1738-IN020A-EN-E - June 2004
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Notes:
ArmorPoint I/O 24V dc Expansion Power Supply, Series A 9
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Rockwell Automation Support
Rockwell Automation provides technical information on the web to assist you in using our products. At
http://support.rockwellautomation.com, you can find technical manuals, a knowledge base of FAQs, technical and
application notes, sample code and links to software service packs, and a MySupport feature that you can customize
to make the best use of these tools.
For an additional level of technical phone support for installation, configuration and troubleshooting, we offer
TechConnect Support programs. For more information, contact your local distributor or Rockwell Automation
representative, or visit http://support.rockwellautomation.com.
Installation Assistance
If you experience a problem with a hardware module within the first 24 hours of installation, please review the
information that's contained in this manual. You can also contact a special Customer Support number for initial help
in getting your module up and running:
United States 1.440.646.3223
Monday – Friday, 8am – 5pm EST
Outside United States Please contact your local Rockwell Automation representative for any technical support issues.
New Product Satisfaction Return
Rockwell tests all of our products to ensure that they are fully operational when shipped from the manufacturing
facility. However, if your product is not functioning and needs to be returned:
United States Contact your distributor. You must provide a Customer Support case number (see phone number
above to obtain one) to your distributor in order to complete the return process.
Outside United States Please contact your local Rockwell Automation representative for return procedure.
ArmorPoint is a trademark of Rockwell Automation.
Publication 1738-IN020A-EN-E - June 2004 10 PN 957899-14
Copyright © 2004 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A.
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