Product Manual

Operating Instructions
16
Mechanical Components
1. Drive Motor
Drive motor is 4 pole with low RPM (1750).
This motor is also capable of variable speed
drive as a standard feature. The motor is 12
lead, Y delta soft starting for low amp draw.
Overload protection is installed for safety.
Normal electric current can fluctuate slightly
for various reasons but if the current spikes,
the overload protection causes the motor(s)
to stop. If this happens, the motors must be
reset manually.
Reasons for tripped overload protection:
a) Operator error: Improper regulation of air
exhaust pressure or other parts of the
system.
b) Branch circuit not sized correctly
c) Mechanical failures:
 Internal motor failure
 Improper motor phasing
 System setting error
 Blocked air/oil separator filter
If motor overload protection is caused by any
other reason, contact Polar Air immediately.
Resetting Overload Protection
Disconnect, tag & lock out
electrical power to unit, or
electrical shock could result.
Figure 9: Mechanical Systems Components
Side View
End View
A. Using lock key, remove
electrical
p
anel from unit
B. Locate BLUE reset
button on relay attached
to K1 contactor.
C. Once motor has cooled,
p
ress-in on BLUE button
Example of relay on larger
units.