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Motor Trouble Guide
The purpose of this guide is to suggest common answers to electrical problems. The information is
not all-inclusive and does not necessarily apply in all cases. When unusual operating conditions,
repetitive failures, or other problems occur, consult an electric motor service firm for assistance.
Trouble
Cause
–
What To Do
Motor fails to start.
Blown fuses
–
Replace with time-delay
fuses or circuit breakers. Check for
grounded winding.
Low voltage
–
Use higher voltage tap on
transformer terminals, increase wire
size. Check for poor connections.
Improper line connections
–
Check
connections against diagram supplied
with motor.
Overload tripped
–
Check and reset
relay in starter. Check heater rating
against motor nameplate current rating.
Check motor load. If the motor has
manual re-set thermal protector, check if
it has been tripped.
Motor may be overloaded
–
Reduce load.
Increase motor size.
If permanent split capacitor motor,
capacitor may be open
–
Indicated by
humming sound. Replace run capacitor.
See nameplate for correct value.
Defective motor or starter
–
Repair or
replace.
Motor stalls.
Overloaded motor
–
Reduce load or
increase motor size.
Low motor voltage
–
See that nameplate
voltage is maintained.
Motor does not come up to speed.
Not applied properly
–
Consult motor
service firm for proper type. Use larger
motor.
Motor takes too long to accelerate.
Excess loading; high inertia load
–
Reduce load. Increase motor size.
Inadequate wiring
–
Increase wire size.
Check for poor connections.
Applied voltage too low
–
Reconnect to a
