SymCom MotorSaver 250A Schematics

Features
Adjustable restart delay
can be set at manual
position or anywhere
between 2-300 seconds.
Universal range from
190-480 VAC 50/60 Hz
provides the versatility
needed to handle global
applications.
Bicolor LED indicator
light is green in normal
conditions and red during
trip conditions.
Microcontroller based
provides better accuracy
and higher reliability than
analog designs.
Transient protected to
meet IEC 1000-4-5:1995
Standards and stand up
under tougher conditions.
DPDT relay provides two
10A @ 240 VAC General
Purpose Relays to switch
heavier loads.
Will detect single phase
condition regardless of
regenerated voltages.
Model 250A is an auto ranging voltage monitor designed to protect 3-phase
motors regardless of size. It is used on 190-480VAC, 50 to 60 Hz motors to
protect the motors from damage caused by single phasing, low voltage,
phase reversal, voltage unbalance, and also high voltage. Added features
include the DPDT contacts that are used to perform two functions when
parameters are exceeded in addition to the standard adjustable restart delay.
A unique microcontroller-based voltage and phase sensing circuit constantly
monitors the three phase voltages to detect harmful power line conditions.
When a harmful condition is detected, the MotorSaver's output relay is
deactivated after a specified trip delay. The output relay reactivates after
power line conditions return to an acceptable level for a specified amount of
time (Restart Delay). The trip and reset delays prevent nuisance tripping due
to rapidly fluctuating power line conditions.
2880 North Plaza Drive • Rapid City, SD 57702
(800) 843-8848 • (605) 348-5580 • FAX (605) 348-5685
www.symcominc.com • email: sales@symcominc.com
Model 250A
Three Phase
Voltage Monitor
•
Engineered
Protection
•
Microcontroller
Based
Protects 3-Phase
motors from:
•Loss of any phase
(single phasing)
•Low voltage
•High voltage
•Voltage unbalance
•Phase reversal
•Rapid cycling
Additional Features:
•UL and cUL listed
•5 year warranty
•Made in USA
•Manual - 2-300 sec.
variable restart delay
•Surface mount with
optional DIN rail mount
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