The 455 Series are 3-phase voltage monitors that combine load
and line side monitoring to offer complete protection. Monitoring
the load side will alert the user of contactor failure or impending
contactor failure. Line side monitoring will also protect the
motor from damaging fault conditions that may be present prior
to the motor starting. With other line/load side monitors, the
motor must be started before a voltage fault is detected. With
the 455, your motor is fully protected at all times.
The 455 Series are 3-phase, dual range voltage monitors that
protect 190-480VAC, 50*/60Hz motors, regardless of their size.
It automatically selects between the 200V and 400V range
when the user selects the nominal voltage setpoint. Other
adjustments include a 2-30 second trip delay, a 2-300 second
restart delay (and manual restart) and a voltage unbalance
trip point of 2-8%. The voltage monitor’s circuitry is powered
through the line side connections, so there is no need for
separate control power, making it easy to install.
Equipped with an infrared LED, the 455 Sereies can
communicate to the optional hand-held diagnostic tool,
Informer-MS to obtain valuable information such as real-time
voltage, voltage unbalance on both line and load sides, motor
run hours, last 20 faults, last 32 motor starts, high and low
voltage trip points, voltage unbalance trip