Teco Installation and Maintenance Manual
TEFC Squirrel Cage Induction Motors
Teco Electric and Machinery Company
Manual Number: IOM ~ TEFC Rev.01
6.3. VARNISH.
Kind of Varnish
JIS-W-25 or W-28 are highly recommended.
a. Method of Varnish Treatment
i. Dipping method: Immerse windings completely into varnish until no
air bubbles appear.
ii. Pouring Method: Pour varnish completely over windings
Note: Let varnish drip to dry after dipping or pouring. Changing position of
the motor will obtain an even coverage.
b. Curing of Varnish
i. Set oven temperature at 110
o
C.
ii. Curing time should be 12 – 16 hours
iii. Ensure ventilation is adequate during curing. Combustible gases are
present.
To ensure adequate insulation the above procedure should be repeated.
6.4. KEY POINTS FOR MAINTENANCE & INITIAL OPERATION
INSPECTION AFTER LONG STORAGE.
6.4.1. If the motor has been out of service in excess of three months, careful
inspection should be made before putting the motor into operation again.
6.4.2. When the motor is not in operation, the following precautionary measures
should be undertaken:
The place for storage should be dry and well-ventilated. If the motor has to
be placed at work site for some time, it should be completely covered and
stored on pallets to prevent dust and moisture contamination.
Inspection and maintenance prior to storage.
Please refer to “Regular Inspection and Maintenance” (Section 6.1).
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