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5.2.7
Insulation resistance test using megger
• For the inverter and the converter unit (FR-CC2), 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
and the converter unit so that the test voltage is not applied to the inverter and the converter unit.
• 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
5.2.8
Withstand voltage test
Do not conduct a withstand voltage test. Deterioration may occur.
R/L1
P/+
Converter
S/L2
N/-
unit
T/L3
Earth (ground) terminal
P/+
U
Inverter
N/-
V
W
Earth (ground) terminal
5. PRECAUTIONS FOR MAINTENANCE AND INSPECTION
5.2 Measurement of main circuit voltages, currents, and powers
Motor
M
500 VDC
megger
119
1
2
3
4
5
6
7
8
9
10
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