Mitsumi electronic 55K, FR-F520-0.75K Inspection Description Periodic Method Crlterlon Instrument

						PROTECTIVE FUNCTIONS
Area of				Interval
	Inspection	Description		Periodic*		Method		Crlterlon	Instrument
Inspec-
	Item		Daily	1	2
tion
				year	years
						Disconnect cables
						from inverter and
	Inverter					measure across
						terminals R, S, T, ↔
	module,	Check resistance
					$	P, N and U, V, W, ↔		(Refer to page 179)	Analog meter
	Converter	across terminals.
						P, N 〈 L1, L2, L3 ↔	+ , −
	module
						and U, V, W, ↔ +	, −〉
						with a meter range of
						100Ω .
Main		(1) Check for chatter		$		(1) Auditory check.		(1) No fault.
circuit	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
	Resistor	(2) Check for open		$		wire-wound		be within ± 10%	Meter, digital
		cable.				resistor.		of indicated	multimeter
						(2) Disconnect one		resistance
						end and measure		value.
						with a meter.
		(1) Check balance of		$		(1) Measure voltage		(1) Phase-to-
		output voltages				across inverter		phase voltage
		across phases with				output terminals U-		balance within
Control		inverter operated				V-W.		4V(8V) for	Digital
circuit	Operation	independently.				(2) Simulatively		200V(400V).	multimeter,
Protec-	check	(2) Perform sequence		$		connect or		(2) Fault must	rectifier type
tive circuit		protective operation				disconnect inverter		occur because	voltmeter
		test to make sure of				protective circuit		of sequence.
		no fault in protective				output terminals.
		and display circuits.
		(1) Check for unusual	$			(1) Turn by hand with		No unusual
Cooling		vibration and noise.				power off.
	Cooling fan							vibration, unusual
system		(2) Check for loose		$		(2) Visual check
								noise.
		connection.
		(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								Must satisfy
	Meter	Check that reading is	$			Check reading of		specified and	Voltmeter,
		normal.				meters on panel.		management	ammeter, etc.
								values.
		(1) Check for unusual	$			(1) Auditory, sensory,
		vibration and noise.				visual checks.
	General	(2) Check for unusual	$			(2) Check for unusual		(1), (2) No fault.
		odor.				odor due to
Motor						overheating,
						damage, etc.
		Check with megger				Disconnect cables
	Insulation					from U, V, W,
		(across terminals and			$			5M Ω or more	500V megger
	resistance					including motor				5
		ground terminal).
						cables.

Note: Values in parentheses are those of the 400V class. *For periodic inspection, consult Mitsubishi.

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