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 TM 5-683/NAVFAC MO-1161AFJMAN 32-1083
Table 4-3. AC induction motor trouble-shooting.
Maintenance
Probable Cause
Trouble
Try starting
Wait for overload to cool.
Overload Control Trip
Motor will not
If motor still does not start,
again.
start
check, all the causes as outlined below.
Connect power to control, check control
sequence and power to motor.
Power not connec ted
to motor.
Check Connections.
Test fuses and circuit breakers.
Check motor-nameplate values with power
Faulty (Open) fuses.
Also check voltage at motor
supply.
terminals with motor under load to be
sure
Low voltage.
wire size is adequate.
Check connect i o n s w i t h c o n t r o l w i r i n g
diagram.
Tighten Connec tions.
Wrong conrol
connections.
If rotor starts
Disconnect motor from load.
check driven machine.
satisfactorily,
Loose Terminal- lead
connction.
Check for open circuits.
Driven machine
Locked.
Check for shorted coil.
Open Circuit in
stator or rotor
winding.
Test for grounded
windi ng.
Free bearings or replace.
Short circuit in
stator winding.
Use special lubricant for special conditions
Winding grounded.
the control
Troubleshoot
Bearing Stiff.
Reduce Load
G r e a s e too stiff.
Isolate and
discharge capacitor check
If opened or shorted, replace.
Faulty c o n t r o l .
It
will
not
Stop motor, t h a n try to s t a r t .
start on single phase.
Overload.
in one of the lines or
Check for "openU
Failed starter
circuits.
capacitor.
Check current balance.
Motor running single
Motor noisy.
phase.
Check aligmen t a n d c o n d i t i o n o f b e l t . O n
pedestal -mounted bearing, check cord play
and axial centering of rotor.
Electrical load
unbalanced.
Shaft bumping
(sleeve-bearing
motors).
4-26
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