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Precautions for Maintenance and Inspection
6.3.4 Insulation resistance test using megger
1)Before performing the insulation resistance test using a megger on the external
circuit, disconnect the cables from all terminals of the inverter so that the test
voltage is not applied to the inverter.
2)For the continuity test of the control circuit, use a meter (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 a 500VDC
megger.)
6.3.5 Pressure test
Do not conduct a pressure test. This may deteriorate the inverter.
R
S
T
U
V
W
Inverter
Earth terminal
IM
Motor
Power
supply
500VDC
megger