Install Instructions

2
7/06
SETTINGS
1. LINE VOLTAGE ADJUSTMENT:
Rotate the VOLT. ADJ. (VAC) knob to
the nominal 3-phase line voltage
feeding the motor to be protected.
The Model 455 will automatically
sense whether it is connected to a
200V or 400V power system.
2. RESTART DELAY: Rotate the
RESTART (SEC) knob to the desired
position. The restart delay is the time between the MotorSaver seeing acceptable power and the
MotorSaver closing its output contacts. For compressor applications, the restart delay should be
set for the approximate time it takes for the head pressure to bleed off of the compressor. For
other applications, the restart delay is typically set to 2 seconds.
NOTE: This delay is also the minimum cycle time or rapid-cycle timer for the motor or compressor
when control power is lost such as the operation of the thermostat.
The manual position on the restart adjustment can be used as a manual reset after any fault
condition, or loss of incoming power. To utilize this feature, rotate the restart adjustment to “2” to
allow the run light to come on—then rotate the restart delay knob back to the manual (MAN) position.
NOTE: When the manual feature is used, the unit will not have rapid-cycle protection if the control
power is lost (i.e. thermostat control); but will require a manual reset if any fault or loss of incoming
power is experienced.
3. VOLTAGE UNBALANCE: Rotate the UNBALANCE TRIP (NEMA %) to the desired voltage
unbalance trip level. The NEMA MG1 standard does not recommend operating a motor above a
1% voltage unbalance as determined by the following formula without derating the motor.
% Voltage Unbalance = Maximum Deviation from the Average
x 100%
Average
The NEMA MG1 standard also recommends against operating a motor above 5% voltage unbalance
under any circumstances. Therefore, a 5% UB setting is a good place to start, but SymCom
recommends consulting the motor manufacturer for specific tolerances.
4. TRIP DELAY ADJUSTMENT: Rotate the TRIP DELAY knob to the desired setting. The
adjustment does not affect the trip delay on a single-phasing fault. Typically, the trip delay is set to
4 seconds, in areas where voltage fluctuations are frequent, the trip delay may need to be set
higher.
POWER-UP
Turn on the 3-phase power to the motor. The MotorSaver’s green RUN light will blink during the
restart delay. After the restart delay, the MotorSaver
®
will energize its output contacts and the green
light will illuminate. If the contacts do not energize and the RUN light does not illuminate, see the
TROUBLESHOOTING section.
RESET RUN HOURS
To reset the run hours, first remove power to the Model 455. Make a note of each of the adjustable
settings. Turn all of the setpoint knobs to the minimum position, i.e., VOLT. ADJ. and RESTART
fully counter-clockwise; UNBALANCE TRIP AND TRIP DELAY fully clockwise. Apply power
momentarily, then remove power again to readjust each setting back to the noted/desired level.
Reapply power.
L1 L2 L3
190-480 VAC, 3Ø, 50/60 HZ
MODEL 455
OVER
VOLT.
PHASING
FAULT
UNDER
VOL T.
PILOT DUTY RATING
480VAAT 240VAC
RUN
VOLT. ADJ .
(VAC)
208
416
220
440
200
400
230
460
190
380
240
480
UNBALANCE
TRIP (NEMA %)
8
2
M1 M2 M3
SymCom. Inc.
300
100
2
MAN
RESTART
(SEC)
302
15
TRIP
DELAY
(SEC)
IND. CONT. EQ.
LISTED
784X