Mitsubishi FREQROL-SFJ, Руководство по обслуживанию

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Cause Checkup
Remedy
Dynamic
Large vibration and noise
Balance the control
occur during coasting of
system and motor
motor.
dynamically.
Insulation Disconnect the power cable
if insulation
resistance (R, S, and measure
is found de-
creased
sulation resistance, using
creased, identify the
500V megger (each
part where insulation
ing wire should have been
is deteriorated and
disconnected.
remedy.
Between entire main
circuit and ground
At least 20Megohm
(Terminals R, S, T, U,
V, W, MS1 and MS2,
and
Between control cir-
cuit COM and ground
At least 20Megohm
(Terminal CH23 of
card SFJ-CA1 and.
ground)
Between entire main
circuit and control
circuit COM
At least 20Megohm
Trouble with Turn the motor shaft by
If the motor shaft
motor bearing
hand to check. cannot be rotated
smoothly, replace
bearing.
Motor mounting Check motor mounting screws
Retighten bolts.
screws loose
for looseness.
Motor shaft
Check if any trace of
Remedy or replace
out damage is found on
the motor.
motor shaft.
Pin -2 and 3 of
Refer to (2).
card SFJ-CA1
Refer to (2).
set improperly.
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