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 TM 5-683/NAVFAC MO-116/AFJMAN 32-1083
Table 5-2. Motor control trouble-shooting chart-continued.
REMEDY
CAUSE
Coil Overheating
9.
Check application and circuit.
Overvoltage or high ambient
temperature.
Check rating and replace with
Incorrect coil.
proper coil if incorrect.
Replace coil.
Shorted turns caused by
mechanical damage or
corrosion.
Correct pole faces.
Undervoltage, failure of
magnet to seal in.
Clean pole faces.
Dirt or rust on pole faces
increasing air gap.
10.
Overload Relays Tripping
Sustained overload.
Check for grounds, shorts or
excessive motor currents.
Clean and tighten.
Loose connection on load
wires.
Relay should be replaced with
correct size heater unit.
Incorrect heater.
11. Overload Relay Fails to
Trip
Clean or replace.
Mechanical binding, dirt,
corrosion, etc.
Apply proper
Check ratings.
heaters.
Wrong heater or heaters
omitted and jumper wires used.
Adjust relay rating
accordingly or make
Motor and relay in different
temperature the same for both.
temperatures.
12.
Noisy Magnet (Humming)
Broken shading coil.
Replace shading coil.
Replace magnet assembly or
Magnet faces not mating.
realign.
Clean and realign.
Dirt or rust on magnet faces.
Check system voltage and
Low voltage.
voltage dips during starting.
5-22
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