Mitsubishi FR - S500 Insulation resistance test using megger, Pressure test, Interval Daily

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.)

	R	Inverter U		Motor
Power supply				IM
	S		V
500VDC	T		W
megger

Earth terminal

3.3.5 Pressure test

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

3.3.6 Daily and periodic inspection

Areaof Inspection				Interval
			Daily		year1	years2
	Inspection				Periodic*
	Item	Description					Method	Criterion	Instrument
							Make	Ambient	Thermo-
							measurement	temperature:	meter,
		Check ambient					5cm (1.97inches)	-10ºC to +50ºC	hygrometer,
							away from	(14ºF to 122ºF),	recorder
	Surrounding	temperature,
							inverter.	non-freezing.
	environment	humidity, dust,
								Ambient
		dirt, etc.
								humidity: 90%
General								or less, non-
								condensing.
		Check for					Visual and	No fault.
	Overall unit	unusual					auditory checks.
		vibration and
		noise.
							Measure voltage	Within	Meter, digital
	Power	Check that main					across inverter	permissible AC	multimeter
							terminals R-S-T	(DC) voltage
	supply	circuit voltage is
								fluctuation
	voltage	normal.
								(Refer to page
								161)

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