Cut Sheet

V8-T7-30 Volume 8—Sensing Solutions CA08100010E—July 2015 www.eaton.com
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For Customer Service in the U.S. call 1-877-ETN CARE (386-2273),
in Canada call 1-800-268-3578.
For Application Assistance in the U.S. and Canada
call 1-800-426-9184.
7.8
Current and Voltage Sensors
CurrentWatch EACR Series
EACR Series CurrentWatch Current Sensors
Contents
Description Page
EACR Series CurrentWatch Current Sensors
Standards and Certifications . . . . . . . . . . . . . . V8-T7-31
Product Selection . . . . . . . . . . . . . . . . . . . . . . . V8-T7-31
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . V8-T7-31
Technical Data and Specifications . . . . . . . . . . V8-T7-32
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . V8-T7-32
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . V8-T7-32
EACR Series CurrentWatch Current Sensors
Product Description
The CurrentWatch EACR
Series current sensor family
from Eaton’s Electrical Sector
combines a current sensor
and a “True RMS” signal
conditioner into a single
package. The EACR Series
provides True RMS output on
distorted waveforms found
on VFD or SCR outputs, and
on linear loads in “noisy”
power environments.
Available in solid- or split-core
housings.
For typical applications of the
Current
Watch EACR Series,
see listing on this page.
Application Description
Typical Applications
●
VFD Controlled Loads—
Monitoring VFD output
indicates how the motor
and attached load are
operating
●
SCR Controlled Loads—
Accurate measurement of
phase angle fired or burst
fired (time proportioned)
SCRs, with faster current
measurement than
temperature sensors
●
Switching Power
Supplies and Electronic
Ballasts—True RMS
sensing is the most
accurate way to measure
power supply or ballast
input power
Why “True RMS”?
The current waveform of a
typical linear load is a pure
sine wave. In VFD and SCR
applications, however, output
waveforms are rough
approximations of a sine
wave. There are numerous
spikes and dips in each cycle.
The CurrentWatch EACR
Series current sensors use a
mathematical algorithm called
“True RMS” which
integrates the actual
waveform over time. The
output is the amperage
component of the true power
(heating value) of the AC
current waveform. True RMS
is the only way to accurately
measure distorted AC
waveforms. Select the EACR
Series sensors for nonlinear
loads in “noisy” power
environments.
For the most current information
on this product, visit our Web site:
www.eaton.com
Example Application—
Current Sensing for Non-Linear AC Loads
Features
●
True RMS Output—True
RMS technology is
accurate on distorted
waveforms like VFD or
SCR outputs
●
Jumper-Selectable
Ranges—Reduces
inventory and eliminates
zero and span
●
Isolation—Output is
magnetically isolated from
the input for safety and
elimination of insertion loss
(voltage drop)
●
UL, cUL and CE
Approved—Accepted
worldwide
137.2A
Controller
Two-Wire Installation
Is Fast and Easy
Field
Selectable
Ranges
True RMS Output
even on VFDs or SCRs
L
I
N
E
VFD
54.7Hz
Motor