Cutler Hammer, Div of Eaton Corp EPRM Series Installation Instructions

Installation Instructions

CurrentWatch™ EPRM Series Current Sensors

Powered AC Current Sensors, Up to 400A Input Range, Analog Outputs

WARNING

IN ORDER TO AVOID ELECTRIC SHOCK OR OTHER POSSIBLE INJURY:

• DO NOT USE THIS PRODUCT FOR HUMAN SAFETY APPLICATIONS.
IT WAS NOT DESIGNED, TESTED OR RECOMMENDED FOR THIS
USE.

• DO NOT USE THIS PRODUCT IN HAZARDOUS LOCATIONS (E.G.
EXPLOSIVE ATMOSPHERES). IT WAS NOT DESIGNED, TESTED OR
RECOMMENDED FOR THIS USE.

• ENSURE THE PRODUCT IS PROPERLY WIRED TO THE CORRECT
POWER SUPLLY FOR THE APPLICATION. REFER TO THE
SPECIFICATIONS AND WIRING DIAGRAMS IN THIS MANUAL.

MODELS COVERED IN THIS MANUAL

Catalog Number Description

EPRM0510ASP 24V DC Aux. Powered, 0-5/0-10V Output, 10/25/50A Range

EPRM1510ASP 24V DC Aux. Powered, 0-5/0-10V Output, 50/75/100A Range

EPRM2510ASP 24V DC Aux. Powered, 0-5/0-10V Output, 100/150/200 Range

EPRM3510ASP 24V DC Aux. Powered, 0-5/0-10V Output, 200/300/400A Range

EPRM0420LSP Loop-Powered, 4-20 mA Output, 10/25/50A Range

EPRM1420LSP Loop-Powered, 4-20 mA Output, 50/75/100A Range

EPRM2420LSP Loop-Powered, 4-20 mA Output, 100/150/200 Range

EPRM3420LSP Loop-Powered, 4-20 mA Output, 200/300/400A Range

EPRMR0510ASP 24V DC Aux. Powered, True RMS, 0-5/0-10V Output, 10/25/50A Range

EPRMR1510ASP 24V DC Aux. Powered, True RMS, 0-5/0-10V Output, 50/75/100A Range

EPRMR2510ASP 24V DC Aux. Powered, True RMS, 0-5/0-10V Output, 100/150/200 Range

EPRMR3510ASP 24V DC Aux. Powered, True RMS, 0-5/0-10V Output, 200/300/400A Range

EPRMR0420LSP Loop-Powered, True RMS, 4-20 mA Output, 10/25/50A Range

EPRMR1420LSP Loop-Powered, True RMS, 4-20 mA Output, 50/75/100A Range

EPRMR2420LSP Loop-Powered, True RMS, 4-20 mA Output, 100/150/200 Range

EPRMR3420LSP Loop-Powered, True RMS, 4-20 mA Output, 200/300/400A Range

INTRODUCTION

The CurrentWatch™ EPRM Series is a family
of DIN-rail compatible, split-core current
sensors. Product features include a
large aperture, switch-selectable inputs
and outputs and isolation between primary and
secondary circuits. A patented technology
eliminates the use of a magnetic core and protects the
sensor against saturation and damage, which can occur
from continuous exposure to high currents. Models available
up to 400A and with 0-5/0-10V DC or 4-20 mA outputs as standard. The
EPRM Series is also available in True RMS, for working with nonlinear
loads in “noisy” power environments.

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PATENTED PROTECTION TECHNOLOGY

The EPRM Series of current sensors features a patented technology
that eliminates problems associated with magnetic circuits such as core
saturation. The sensor will not be damaged by momentary periods of
high current, and the output from the sensor is limited to protect the
signal input device.

QUICK INSTALL GUIDE

The below steps can be followed to quickly install a CurrentWatch™
EPRM Series sensor.

1. Run the wire to be monitored through the cable guide and aperture

2. Mount the sensor to a standard DIN rail

3. Connect output wiring with the provided terminal block
a. Use up to 12 AWG copper wires
b. For voltage output models, make sure output load is at least

10 kilohms

4. Choose the correct current range by positioning the Range Switch

INSTALLATION

Considerations for all EPRM Series sensors…

• Place the wire in which current is to be monitored through the
cable guide and aperture of the sensor

• Insert a fl at blade screwdriver into the gap next to the split core
sensor head, and gently turn the screwdriver to release the latch

• Repeat for the opposite side of the sensor head, and the top will
come straight off the sensor body

• To clamp the sensor head, place it on the axis and press down
fi rmly until the latches clip in place

• Mount the EPRM unit directly onto a standard DIN rail

• Note: This sensor is not directionally sensitive and can be mounted
in any position or hung directly on wiring with use of wire ties

SETPOINT ADJUSTMENT

The CurrentWatch™ EPRM Series sensors feature fi eld selectable
ranges. The ranges are factory calibrated, eliminating time consuming
and inaccurate fi eld setting of zero or span.

Selecting Range

1. Determine the normal operating amperage of your monitored
circuit

2. Select the current range that is equal to or slightly higher than the
normal operating amperage

3. Place the Range Switch in the appropriate position

Effective: May 2010 Page 1

Questions? Call our Sensor Application Engineers at [phone].

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192000024

OUTPUT WIRING

Connect control or monitoring wires to the sensor using the supplied
female termination.

Model Wiring Diagram

Current Output
(4-20 mA) Models

Voltage Output
(0-5/0-10V DC)
Models

Load

Load

GND

OUT

OUT

+24V

+24V

Current Output
Loop-Powered

Auxillary Powered

Load

(-)

(+)

(-)

(+)

Power

Supply

Power

Supply

TROUBLESHOOTING

Problem

Output (4-20 mA) Models

Sensor has no output Power supply is not properly sized. Check power supply voltage and

current rating.

Monitored load is not AC or is not on. Check that the monitored load is
AC and that it is actually on.

Polarity is not properly matched. Check and correct wiring polarity.

Solution for Current

Output signal is
too low

The jumper may be set in a range that is too high for current being
monitored. Move jumper to the correct range.

The load current is not sinusoidal
(EPRM Series only). Select
an EPRMR Series (True RMS)
sensor that works on distorted
waveforms.

For loop-powered models, monitored current is below minimum
required. Loop the monitored wire several times through the aperture
until the “sensed” current rises above minimum. (‘Sensed Amps’ is
equal to ‘Actual Amps’ multiplied by the ‘Number of Loops.’)

Output signal is
always at maximum

Output signal is
always at 4 mA

The jumper may be set in a range that is too low for current being
sensed. Change the jumper position.

Monitored load is not AC or is not
on. Check that the monitored load
is AC and that it is actually on.

Solution for Voltage
Output (0-5/0-10V DC) Models

Output load may be too low.
Check output load, making sure it
is at least 10 kilohm.

—

SPECIFICATIONS

Specifi cation Value

Power Supply 24V DC Nominal ± 5%

Output Signal Current Output Models: 4-20 mA

Voltage Output Models: 0-5V DC or 0-10V DC

Output Limit Current Output Models: 25 mA

Voltage Output Models: 9V for 5V Output, 18V for 10V Output

Response Time EPRM: < 500 ms

EPRMR: < 1,000 ms

Accuracy 1.0% FS

Loading Voltage Output Models: 10 Kilohm Min. Recommended

Isolation Voltage 5 kV

Frequency Range Average Responding Models (Non-RMS): 20-6,000 Hz (Sinusoidal)

True-RMS Models (EPRMR): 20-6,000 Hz (All Wave Forms)

Sensing Aperture 0.74 in. (19mm) dia.

Housing UL94 V0 Flammability Rated Thermoplastic

Environmental Operating Temperature: -4 to +122° F (-20 to +50° C)

Humidity: 0-95% RH, Non-Condensing

Approvals UL 508 Industrial Control Equipment (Pending USA)

CE Certifi ed

Effective: May 2010 Page 2

Questions? Call our Sensor Application Engineers at [phone].