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
						Ω
						range of 100 .
		(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 and						Capacity
Main	capacitor	bulge.						meter
		(3) Measure		{
circuit
		electrostatic
		capacity.
		(1) Check for chatter		{		(1) Auditory check.	(1) No fault.
	Relay	during operation.				(2) Visual check.	(2) No fault.
		(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 with				output terminals	balance within
Control		inverter operated				U-V-W.	8V for 400V.	Digital
circuit	Operation	independently.				(2) Simulatively	(2) Fault must	multimeter,
Protective	check	(2) Perform sequence		{		connect or	occur because	rectifier type
circuit		protective operation				disconnect inverter	of sequence.	voltmeter
		test to make sure of				protective circuit
		no fault in protective				output terminals.
		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
	power			{		Measure with a tester.	24V±2.4V	Tester
		output voltage correct?
	supply
		(1) Check if LED lamp	{			(1) Light indicator	(1) Check that
	Display	is blown.				lamps on panel.	lamps are lit.
		(2) Clean.		{		(2) Clean with rag.
Display		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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