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U.S. ELECTRICAL MOTORS
INSTALLATION AND MAINTENANCE
TROUBLE
Motor overheating (Check with
thermocouple or by resistance
methods - do not depend on hand)
Troubleshooting
CORRECTION
Measure load; compare with nameplate
rating; check for excessive friction in
motor or complete drive. Reduce load
or replace motor with greater capacity
motor.
Clean motor intake and exhaust areas.
Clean filters or screens if motor is so
equipped. See safety section.
Check voltage, all phases.
Disconnect motor from load. Check
idle amps for balance in all three
phases. Check stator resistance in all
three phases for balance. See safety
section.
Check voltage and compare to
nameplate voltage.
Locate with test lamp or insulation
tester and repair.
Recheck connections.
POSSIBLE CAUSE
Overload
Dirt in motor intake or exhaust
openings
Unbalanced voltage
Open stator windings
Over / under voltage
Ground
Improper connections
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