Mitsubishi Electronics FR-A500L instruction manual Daily and Periodic Inspection

PROTECTIVE FUNCTIONS

Daily and Periodic Inspection

Area of				Interval
	Inspection				Periodic
Inspec-		Description					Method	Criterion	Instrument
	Item		Daily		1	2
tion
					year	years
							Disconnect cables
							from inverter and
	Inverter						measure across
	module,	Check resistance				¡	terminals R, S, T, P, N	(See the following	Analog tester
	Converter	across terminals.					and U, V, W, P, N <L1,	pages)
	module						L2, L3, +, -, and U, V,
							W, +, -> with tester
							range of 100Ω.
		(1) Check for liquid	¡				(1), (2) Visual check.	(1), (2) No fault.
		leakage.					(3) Measure with	(3) 85% or more
		(2) Check for safety	¡				capacity meter.	of rated capacity.
	Smoothing	valve projection							Capacity
	capacitor	and bulge.							meter
Main		(3) Measure			¡
circuit		electrostatic
		capacity.
		(1) Check for chatter			¡		(1) Auditory check.	(1) No fault.
		during operation.					(2) Visual check.	(2) No fault.
	Relay	(2) Check for rough			¡
		surface on
		contacts.
		(1) Check for crack in			¡		(1) Visual check.	(1) No fault.
		resistor insulation.					Cement resistor,	(2) Error should
		(2) Check for open			¡		wire-wound	be within	Tester, digital
	Resistor	cable.					resistor.	±10% of
									multimeter
							(2) Disconnect one	indicated
							end and measure	resistance
							with tester.	value.
		(1) Check balance of			¡		(1) Measure voltage	(1) Phase-to-
		output voltages					across inverter	phase voltage
		across phases					output terminals U-	balance within
		with inverter					V-W.	8V for 400V.
Control		operated					(2) Simulatively	(2) Fault must	Digital
circuit	Operation	independently.			¡		connect or	occur	multimeter,
Protective	check	(2) Perform sequence					disconnect	because of	rectifier type
circuit		protective operation					inverter protective	sequence.	voltmeter
		test to make sure of					circuit output
		no fault in					terminals.
		protective and
		display circuits.
		(1) Check for unusual	¡				(1) Turn by hand with	(1) Smooth
	Cooling fan	vibration and noise.					power off.	rotation.
		(2) Check for loose			¡		(2) Re-tighten	(2) No fault.
Cooling
		connection.
system
	Cooling fan	Is the power supply's					Measure with a
	power				¡			24V±2.4V	Tester
		output voltage correct?					tester.
	supply
		(1) Check if LED lamp	¡				(1) Light indicator	(1) Check that
	Display	is blown.					lamps on panel.	lamps are lit.
Display		(2) Clean.			¡		(2) Clean with rag.
		Check that reading is	¡				Check reading of	Must satisfy
	Meter	normal.					meters on panel.	specified and	Voltmeter,
								management	ammeter, etc.
								values.
		(1) Check for unusual	¡				(1) Auditory, sensory,	(1), (2) No fault.
		vibration and noise.					visual checks.
	General	(2) Check for unusual	¡				(2) Check for unusual
		odor.					odor due to
Motor							overheating,
							damage, etc.
		(1) Check with megger				¡	(1) Disconnect cables	(1) 5M Ω or more
	Insulation	(across terminals					from U, V, W,		500V megger
	resistance	and ground					including motor
		terminal).					cables.

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