Insulation Resistance Test Using Megger; Pressure Test; Daily And Periodic Inspection - Mitsubishi FR - S500 Instruction Manual

3

.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.)
Power supply
3

.3.5 Pressure test

Do not conduct a pressure test. The inverter may be deteriorated.
3

.3.6 Daily and periodic inspection

Inspection
Description
Item
Check ambient
Surrounding temperature,
environment humidity, dust,
dirt, etc.
Check for
unusual
Overall unit
vibration and
noise.
Power Check that main
supply circuit voltage is
voltage normal.
R
S
T
500VDC
megger
Earth terminal
Interval
Periodic*
150
Inverter U
V
W
Method Criterion
Make Ambient
measurement temperature:
5cm (1.97inches) -10ºC to +50ºC
away from (14ºF to 122ºF),
inverter. non-freezing.
Ambient
humidity: 90%
or less, non-
condensing.
Visual and No fault.
auditory checks.
Measure voltage Within
across inverter permissible AC
terminals R-S-T (DC) voltage
fluctuation
(Refer to page
161)
Motor
IM
Instrument
Thermo-
meter,
hygrometer,
recorder
Meter, digital
multimeter
3