Mitsubishi FREQROL-SFJ - Page 120

c
Frequency
Checkup Remarks
1. Check cooling fan op-
eration.
2. Check cooling air
passage (between
frame and cover).
3. Insulation
resistance
3. Check load condition.
-----_-----__-----_-_--__--___----_
4. Check control equip-
See "Trou-
ble shoot-
ment.
ing".
Every 6
o Check if insulation
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
Megohm,
clean and dry
motor interior.
To dry,
disassemble
and heat motor at
temperature less than
9o"c.
4. Cooling fan
Weekly
o Check cooling fan
Monthly
for operation, noise
and vibration.
-117-