Insulation Resistance Test Using Megger; Pressure Test - Mitsubishi Electric FR-S520E Series Instruction Manual

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 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)
500VDC class
megger
3.3.5

Pressure test

Do not conduct a pressure test. Deterioration may occur.
R
Power
S
supply
T
Earth (Ground) terminal
185
Precautions for maintenance and inspection
Inverter U
V
W
Motor
IM
3