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 TM 5-683/NAVFAC MO-116/AFJMAN 32-1083
Table 4-3. AC induction motor trouble-shooting-continued
..
.
Probable Cause
Maintenance
Trouble
Vibration from
Balance or align machine.
Motor vibrates.
unbalanced or
misalignment
If motor
Possible mechanical
Remove motor from load.
system resonance.
i s s t i l l n o i s y , rebalance motor.
Air gap not uniform.
Center the rotor and if necessary
replace bearings.
Noisy ball bearings.
Replace
Check lubricants.
bearings if noise is persistent
and excessive.
Loose punchings or
Tighten all holdings bolts.
loose rotor on shaft.
Rotor rubbing
on
Center the rotor and replace
stator.
bearings if necessary.
Objects caught
Disassemble motor end clean it.
between fan and end
Any rubbish around motor should be
shields.
removed.
Motor loose on
Motor
Tighten holding-down bolts.
foundation.
may possibly have to be realigned.
Coupling loose.
Check
Check coupling joint.
Tighten coupling.
alignment.
Overload.
Measure motor Loading with watt-
At higher than
Reduce toad.
temperature
meter.
or smoking.
Electrical Load
Check for voltage unbalance or
unbalanced.
single phasing.
C h e c k f o r " o p e nU in one of the
Fuse blown, faulty,
control, etc.
lines or circuits.
Restricted
Clean air passages and windings.
ventitation
values with
Incorrect Voltage and
Check motor-nameptate
power supply.
Also check voltage
at motor terminals with motor
under full load.
Check
Remove power from motor.
Motor stalled by
machine for cause of stalling.
driven machine or by
tight bearings.
Use insulation testing procedures.
Stator winding
sorted.
Stator winding
Use insulation testing procedures.
grounded.
4-27
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