Mitsumi electronic FR-F520-0.75K, 55K Insulation resistance test using megger, Pressure test

PROTECTIVE FUNCTIONS

5.3.4Insulation 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 〈 L1〉 Inverter	U	Motor
Power				IM
	S 〈L2〉	V
supply
	T 〈 L3〉	W

DC500V megger

Ground terminal

5.3.5 Pressure test

Do not conduct a pressure test. The inverter's main circuit uses semiconductors, which may be deteriorated if a pressure test is made.

5.3.6 Daily and Periodic Inspection

Area of				Interval
	Inspection			Periodic
Inspec-		Description				Method	Criterion	Instrument
	Item		Daily	1	2
tion
				year	years
							Ambient
							temperature:
							(constant torque)
							− 10ºC to +50ºC
		Check ambient					(14ºF to 122ºF),	Thermometer,
	Surrounding		$			(Refer to page 7)	non-freezing.
	environment	temperature, humidity,					(Variable torque)	hygrometer,
		dust, dirt, etc.					− 10ºC to +40ºC	recorder
							(14ºF to 104ºF),
General							non-freezing
							Ambient humidity:
							90% or less,
							non-condensing.
	Overall unit	Check for unusual	$			Visual and auditory	No fault.
		vibration and noise.				checks.
						Measure voltage	Within permissible
	Power						AC voltage
		Check that main circuit				across inverter		Meter, digital
	supply		$				fluctuation
		voltage is normal.				terminals R-S-T		multimeter
	voltage						(Refer to page
						〈 L1-L2-L3〉 .
							184)
		(1) Check with megger			$	(1) Disconnect all
		(across main circuit				cables from
		terminals and				inverter and
		ground terminal).				measure across
		(2) Check for loose		$		terminals R, S, T,	(1) 5M Ω or more.	500VDC class
	General	screws and bolts.				U, V, W 〈 L1, L2, L3,
		(3) Check for overheat-		$		U, V, W〉 and	(2), (3) No fault.	megger
Main		ing of each part.				ground terminal
		(4) Clean.		$		with megger.
circuit
						(2) Re-tighten.
						(3) Visual check.
		(1) Check conductors		$
	Conductors,	for distortion.				(1), (2) Visual check.	(1), (2) No fault.
	cables	(2) Check cable sheaths		$
		for breakage.
	Terminal	Check for damage.		$		Visual check.	No fault
	block
						* For periodic inspection, consult Mitsubishi.

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