Teco Installation and Maintenance Manual
TEFC Squirrel Cage Induction Motors
Teco Electric and Machinery Company
Manual Number: IOM ~ TEFC Rev.01
3.2.3 Insulation resistance test should be performed before making high voltage
test.
a. Use 500VDC megger to measure insulation resistance.
i. Stator: Over 50MΩ between windings.
ii. Stator: Over 50MΩ between windings and earth.
b. High Voltage Test
i. This test can be undertaken only after the values of insulation resistance in
item 3.2.3 (a) are assured.
ii. The value of testing voltage is (1000 + 2E) X 0.8 where E: rated voltage.
3.2.4. Care should be taken to keep parts such as the fitting surface, key, shaft
extension and axial centre hole free of any foreign matter. Grease should
also be generously applied to stop rust.
3.2.5. The shaft should also be rotated by hand a few revolutions once per month.
3.2.6. If practical, a test run should be performed once every three months.
3.2.7. Clean the motor thoroughly, and replenish grease before the machine is put
back to operation.
3.2.8. The ventilation system should be covered to avoid the entry of foreign
matter or insects. It should be thoroughly cleaned before use.
3.2.9. Make sure the hoisting hook is correctly connected to eye bolts or lugs of
motors before hoisting.
Parts such as fan cowl, terminal boxes, etc. which have their
own lifting facilities can only carry their own weight.
They should not be used for lifting the entire motor.
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