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3. Insulation
resistance
4. Cooling fan
Frequency
1. Check cooling fan op-
eration.
2. Check cooling air
passage (between
frame and cover).
3. Check load condition.
4. Check control equip-
ment.
o Check if insulation
Every 6
months
resistance is exces-
sively low.
To check, measure in-
sulation resistance
between the entire
circuit and ground
(control panel discon-
nected).
Insulation resistance
should be larger
than lMegohm, measur-
ed by 5OOV megger.
If insulation resis-
tance is less than 1
motor interior.
To dry, disassemble
and heat motor at
temperature less than
o Check cooling fan
Weekly
Monthly
for operation, noise
and vibration.
Checkup
Remarks
See "Trou-
ble shoot-
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Table of Contents
Troubleshooting
