Teco Installation and Maintenance Manual
TEFC Squirrel Cage Induction Motors
Teco Electric and Machinery Company
Manual Number: IOM ~ TEFC Rev.01
Chapter 5: ROUTINE MAINTENANCE
5.1. IMPORTANCE OF DAILY INSPECTION.
5.1.1. Normally electric motors do not fail suddenly. It happens over time, and
regular inspection will detect a problem before a serious situation develops.
If operators in the plant are alert, faults can be detected early and action
taken to eliminate trouble.
Daily inspection, can be performed without interrupting the end user’s
normal operation.
5.1.2. Do not overlook any minor irregularities. If necessary, stop the machine
immediately to check and repair. Essentially, inspections should be
performed by the operator daily. But a maintenance technician should also
check the machine once a week together with the operator.
5.2. POINTS TO NOTE WHEN STARTING.
a. Check power supply to see if voltage and frequency are normal.
b. Is starter set at starting position?
c. Are there sparks during start?
d. Is the motor accelerating normally?
5.3. TEMPERATURE RISE.
5.3.1. The temperature of a motor is often determined by measuring the
temperature of the frame. This is not indicative of actual internal
winding operating temperature, however, this method can often be
referred to and compared with previous readings. If the temperature is
found to be higher than usual please check the following possibilities.
DO NOT MAKE TEMPERATURE READINGS WITH THE SENSE OF TOUCH.
Often the temperature of a motor is determined by touch. Human hands can only
tolerate temperatures below 60
0
C. Most motors safely operate at temperatures
greater than this, therefore, the sense of touch should not be used. Temperature
readings by hand are also inaccurate. Readings should be made using a
thermometer probe or non-contact infra red thermometer.
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