Electric motor troubleshooting guide – Ashland 1200 TR User Manual
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ELECTRIC MOTOR TROUBLESHOOTING GUIDE
PROBLEM
POSSIBLE CAUSES
REMEDY
Noisy Bearings
(listen to bearings
for the following)
Smooth Mid-Range Hum Normal Fit.
Bearing OK.
High Whine
Internal fit of bearing too tight.
Replace bearing -check fit.
Low Rumble
Internal fit of bearing too loose.
Replace bearing -check fit.
Rough Clatter
Bearing Destroyed.
Replace bearing -Avoid:
a. Mechanical Damage.
b. Excessive Greasing.
c. Wrong Grease.
d. Solid Contaminants.
e. Water running into motor.
f. Misalignment on close
coupled application.
g. Excessive belt tension.
High Input Current (all
Accuracy of ammeter readings
First check accuracy of
three phases)
ammeter readings on all three
phases.
Running Idle
High Une Voltage
Consult power company.-
(disconnected from
5 to 10% over nameplate.
possibly decrease by using
load)
lower transformer tap.
Running Loaded
Motor Overloaded.
Reduce load or use larger
motor.
Motor voltage rating does not
Replace motor with one of
match power system voltage.
correct voltage rating.
Consult power company -
possibly correct by using a
different transformer tap.