Teco Installation and Maintenance Manual
TEFC Squirrel Cage Induction Motors
Teco Electric and Machinery Company
Manual Number: IOM ~ TEFC Rev.01
4.3.2. Vibration:
a. The ideal values generally for motors are figures below 2.8mm/sec.
If vibration exceeds this level, an examination of the motor, load, structure
etc, should be made to determine the cause, the first check to undertake
would be to run the motor un-coupled and check if the vibration is still
evident, see section 5.4 Vibration.
4.3.3. Starting:
a. If the motor acceleration time exceeds the typical ramp time for this
application, shut off the power immediately.
Investigate thoroughly and take corrective action before attempting to
restart.
b. It should be recognised that each start of an induction motor subjects the
motor to current greater than full load current with resulting heating of the
stator and rotor windings. Each start can produce more heat than is
produced and dissipated by the motor under a full load condition.
c. The starting duty for which the motor is designed must not be exceeded if
long motor life is expected. Abnormally low terminal voltage and/or
excessive load torque during motor start up can cause lengthened
acceleration times during which the rotor ventilation is reduced. This can
cause rotor damage or lead to shortened rotor life.
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