Mitsubishi Electric 800 Series Instruction Manual page 53

3.2.8 Insulation resistance test using megger
• For the inverter, conduct the insulation resistance test on the main circuit only as follows and do not perform the test on
the control circuit.
(Use a 500 VDC megger.)
NOTE
• 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.
• For the continuity test of the control circuit, use a tester for high resistance range and do not use the megger or buzzer.
Power
supply
500 VDC
megger
3.2.9 Withstand voltage test
Do not conduct a withstand voltage test. Deterioration may occur.
Motor
R/L1 U
Inverter
IM
S/L2 V
T/L3 W
3. Precautions for Maintenance and Inspection
3.2 Measurement of main circuit voltages, currents, and powers
1
2
3
4
5
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7
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9
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