Electric motor troubleshooting guide – Ashland 1200 TR User Manual

Page 40

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40

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.

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