Cut Sheet

Volume 8—Sensing Solutions CA08100010E—July 2015 www.eaton.com V8-T7-5
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
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.
7.1
Current and Voltage Sensors
VoltageWatch EVT Series
EVT Series VoltageWatch Voltage Sensors
Contents
Description Page
EVT Series VoltageWatch Voltage Sensors
Standards and Certifications . . . . . . . . . . . . . . V8-T7-6
Catalog Number Selection . . . . . . . . . . . . . . . . V8-T7-6
Product Selection . . . . . . . . . . . . . . . . . . . . . . . V8-T7-6
Technical Data and Specifications . . . . . . . . . . V8-T7-7
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . V8-T7-7
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . V8-T7-7
EVT Series VoltageWatch Voltage Sensors
Product Description
Eaton’s VoltageWatch™
sensor is a high-performance,
true RMS sensor for sensing
voltage in single- and three-
phase installations.
Applicable on nominal circuits
of 120V, 240V and 480V, this
voltage sensor provides a
fully isolated analog output
proportional to rated nominal
voltage in both sinusoidal and
non-sinusoidal (variable
frequency) situations. It is
housed in a slim, compact,
easy-to-install DIN rail mount
enclosure.
Ideal for situations where
power quality is of interest or
concern, the VoltageWatch
sensor facilitates monitoring
of supply voltage levels,
identifying undervoltage or
overvoltage conditions, and
helping to protect critical
motors and electronics.
Designed with an industry-
standard 4–20 mA output,
VoltageWatch is easily
coupled to a data logger,
panel meter or PLC to enable
basic trending of operational
status of low voltage circuits
up to real-time monitoring
and reporting of supply
voltage levels.
Application Description
True RMS Voltage Monitoring
●
Detect below normal or
“brown out” voltage
conditions; protect against
possible motor overheating
●
Identify phase-loss
conditions by detecting
voltage reduction in one or
more phases of a three-
phase motor
●
Monitor overvoltage
conditions associated with
regenerative voltage to
help in diagnosing/avoiding
motor drive issues
●
Detect voltage conditions
that may cause stress in or
damage to soft starter
components (SCRs)
For the most current information
on this product, visit our Web site:
www.eaton.com
Example Application—Phase Loss
Features
●
True RMS Output—
Allows for use in situations
where power supplied is
non-sinusoidal, such as
VFD applications, poor
power quality installations
or other electrically harsh/
challenging environments
●
Standard 4–20 mA Loop
Powered Output—
Industry standard output
works easily and reliably
with existing controllers,
data loggers and SCADA
equipment
●
Input/Output Isolation—
Input and output circuitry is
electrically isolated for
improved safety
●
Compact DIN Rail Mount
Enclosure—Space-saving
35 mm wide enclosure
mounts quickly for an
attractive installation
PLC
24 Vdc Supply
–+
VTR
VTR
VTR
480 Vac
500 Vac
460 Vac
Zero Vac
4 mA Transducer Output
AC Voltage
Phase to Phase
20 mA Transducer Output
19.36 mA Transducer Output
18.72 mA Transducer Output
Motor
Control
Signal
Motor
Starter