Eaton CurrentWatch EPRM Series User manual

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.
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
Patented Protection Technology
The EPRM Series of current sensors features a patented technolo-
gy 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 aper-
ture
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
CurrentWatch™ EPRM Series Current Sensors
Powered AC Current Sensors, Up to 400A Input
Range, Analog Outputs
Instructions Publication P51928 Effective March 2014
Supersedes May 2010

Specications
Specification 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 Certified
Output Wiring
Connect control or monitoring wires to the sensor using the sup-
plied female termination.
Model Wiring Diagram
Current Output
(4-20 mA) Models
Voltage Output
(0-5/0-10V DC)
Models
Power
Supply
Load
(-)
(+)
OUT +24V
Current Output
Loop-Powered
Power
Supply
Load
(-)
(+)
GND OUT +24V
Auxillary Powered
Load
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 flat 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
firmly until the latches clip in place.
• Mount the EPRM unit directly onto a standard DIN rail.
ote:N 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 field selectable
ranges. The ranges are factory calibrated, eliminating time consum-
ing and inaccurate field 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
Troubleshooting
Problem
Solution for Current
Output (4-20 mA) Models
Solution for Voltage
Output (0-5/0-10V DC)
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.
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 sinu-
soidal (EPRM Series only).
Select an EPRMR Series (True
RMS) sensor that works on
distorted waveforms.
Output load may be too low.
Check output load, making
sure it is at least 10 kilohm.
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 maxi-
mum
The jumper may be set in a range that is too low for current
being sensed. Change the jumper position.
Output signal is
always at 4 mA
Monitored load is not AC or is
not on. Check that the moni-
tored load is AC and that it is
actually on.
—
Eaton Corporation
Electrical Sector
1111 Superior Ave.
Cleveland, OH 44114
United States
877-ETN-CARE (877-386-2273)
Eaton.com
© 2014 Eaton Corporation
All Rights Reserved
Publication No. P51928 / 004
March 2014
Eaton is a registered trademark of Eaton
Corporation.
All other trademarks are property of their
respective owners.
Instructions Publication P51928
Effective March 2014
CurrentWatch™ EPRM Series Current
Sensors Powered AC Current Sensors,
Up to 400A Input Range, Analog Outputs