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 TM 5-683/NAFAC MO-116/AFJMAN 32-1083
Table 4-4. AC synchronous motor trouble-shooting.
Maintenance
Probable Cause
Trouble
Inspect for open or poor
Faulty connection.
Motor will not
correction.
start.
Test,
locate and repair.
Open circuit one
phase.
open and repair.
Short Circuit one
phase.
Reduce the impedance of the
Voltage falls too
external circuit.
low.
Make sure bearings are properly
high.
lubricated.
Check
bearing
tightness.
Check belt tension.
Check
load friction.
Check
alignment.
contactor
Be sure field-applying
Field excited.
is open and field-discharge
contactor is closed through
discharge resistance.
Remove part of load.
Load too great.
Check power supply to solenoid.
Automatic field relay
not working.
Check contactor tips.
Check
connections.
Reverse any two main leads of 3--
Wrong direction of
phase motor.
rotation
reverse starting
Single-phase,
winding leads.
Motor will not come
Decrease the load.
Excessive load.
up to speed.
Check operation of unloading
device (if any) on driven machine
Increase
voltage.
Low voltage
contactor
Be sure field-applying
is open, and field-discharge
contactor is closed through
discharge resistance.
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