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Precautions for maintenance and inspection
3.3.4 Insulation resistance test using megger
1)Before performing the insulation resistance test on the external circuit, disconnect
the cables from all terminals of the inverter and filter pack so that the test voltage is
not applied to the inverter.
2)For the continuity test of the control circuit, use a tester (high resistance range) and
do not use the megger or buzzer.
3)For the inverter, conduct the insulation resistance test on the main circuit only as
shown below and do not perform the test on the control circuit. (use the 500VDC
megger)
3.3.5 Pressure test
Do not conduct a pressure test. Deterioration may occur.
U
V
W
Inverter
500VDC
megger
Power
supply
IM
Moto
r
R
S
T
Earth (Ground) terminal