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 TM 55-1905-223-24-3
(9)
Reconnect all three output terminals and repeat all previous drying steps.
NOTE
For generators not connected to a runable engine, use forced warm air to dry the generator windings.
(10)
Direct the warm air from one or two fan heaters into the openings at either end of the generator. Make
sure that the air flows over the windings through the generator.
NOTE
Do not exceed 80 (176 ) air temperature when drying the generator.
C
F
(11)
After 2 hours, measure the main stator insulation resistance. Refer to step h.
(12)
If the insulation resistance is satisfactory, put the unit into service.
(13)
If the insulation resistance is still too low, repeat all the pre ious drying steps.
v
NOTE
The permanent magnet exciter stator cannot be dried by the previous procedures.
(14)
To dry the permanent magnet exciter stator insulation, remove the permanent magnet stator from the
generator. Refer to Disassembly procedures.
(15)
Inspect the stator. Check the leads going to the plug for worn or damaged insulation. Repair as
required.
(16)
Recheck the insulation resistance. Refer to step h.
(17)
If the insulation resistance is still below 1.2 megohms, place the sator in an oven at 230 (110 ) for
t
F
C
3 hours.
(18)
Remove the stator from the oven. Allow it to cool to room temperature. Measure the insulation
resistance.
(a)
If the reading is 1.2 megohms or above, reassemble the generator.
(b)
If the reading is below 1.2 megohms, repeat the previous drying steps.
NOTE
Insulation resistance goes down rapidly as temperature rises. Measuring a hot (212 (100 )) stator
F
C
can give a low reading.
4-16
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