Measurements On The Main Circuit; Insulation Resistance Test Using Megger; Pressure Test - Mitsubishi Electric FR-F740 EC Instruction Manual

Maintenance and inspection
8.2

Measurements on the main circuit

This section describes the measurement of the main circuit voltages, currents, powers and in-
sulation resistance.
8.2.1

Insulation resistance test using megger

For the inverter, conduct the insulation resistance test on the main circuit only as shown below.
(Use a 500V DC megger.) Do not perform the test on the control circuit.
Fig. 8-15: Insulation resistance test
CAUTION:
E
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.
NOTE
For the electric continuity test of the control circuit, use a tester (high resistance range) and
do not use the megger or buzzer.
8.2.2

Pressure test

Do not conduct a pressure test. Deterioration may occur.
FR-F700 EC
Power
supply
500V DC
megger
Earth
Measurements on the main circuit
M
3~
I001312E
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