SymCom MOTORSAVER 460 Installation Instructions Manual page 3

SETTINGS
1. Line voltage adjustment: Rotate the
"VOLTAGE ADJ. (VAC)" to the nominal
three-phase line voltage feeding the motor
to be protected.
2. Restart delay adjustment: Rotate the
"RESTART (SEC)" adjustment to the
desired position. The restart delay is the
time between MotorSaver
acceptable voltage 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 between 2 and 10 seconds.
3. Trip delay adjustment: Rotate the "TRIP
DELAY (SEC)" adjustment to the desired
setting. This adjustment does not affect the
trip delay on phasing faults. Typically, the
trip delay adjustment is set between 1 and 5
seconds. In areas where voltage fl uctuations are frequent, the trip delay
adjustment may be set greater than 10 seconds.
4. Voltage unbalance adjustment: Rotate the "UNBALANCE TRIP (NEMA%)"
adjustment to the desired unbalance trip level. The NEMA MG1 standard
does not recommend operating a motor above 1% voltage unbalance without
derating the motor. The NEMA MG1 standard also recommends against derating
operating a motor above a 5% voltage unbalance under any circumstances.
SymCom recommends consulting the motor manufacturer for specifi c
tolerances.
Percent Unbalance =
Example: The measured line-to-line voltages are 203, 210, and 212.
Average =
The maximum deviation from the average is the largest difference
between the average voltage (208.3) and any one voltage reading.
The maximum deviation from the average is 5.3.
5.3
208.3
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
seeing
Maximum Deviation from the Average
203 + 210 + 212
208.3 - 203 = 5.3
x 100 = 2.5% Unbalance

Average
= 208.3
3
210 - 208.3 = 1.7
208 220
416 440
200 230
400 460
190 240
380 480
x 100
212 - 208.3 = 3.7
MODEL 460