Mitsubishi Electronics FR-V500 Precautions for maintenance and inspection Pressure test

Precautions for maintenance and inspection

6.5.5Pressure test

Do not conduct a pressure test. Deterioration may occur.

6.5.6Daily and periodic inspection

			Interval						Customer’s check
Area of	Inspection	Description		Periodic*		Method	Criterion	Instrument
Inspection	Item		Daily	1 year	2 years
							Ambient
							temperature: -10°C
	Surrounding	Check ambient				Measure 5cm away from	to +50°C , non-	Thermometer,
		temperature, humidity,	"			the inverter.	freezing.	hygrometer,
	environment
		dust, dirt, etc.				(Refer to page 6.)	Ambient humidity:	recorder
							90% or less, non-
General							condensing.
	Overall unit	Check for unusual	"			Visual and auditory	No fault.
		vibration and noise.				checks.
		Check that the main				Measure voltages	Within permissible
	Power supply					across the inverter	AC (DC) voltage	Tester, digital
		circuit voltages are	"
	voltage	normal.				terminal block R, S and	fluctuation (refer to	multimeter
						T phases.	page 99)
		(1) Check with megger				(1) Disconnect all cables
		(across main circuit				from the inverter and
		terminals and earth				measure across
	General	(ground) terminal).		"	"	terminals R, S, T, U,	(1) 5MΩ or more.	500VDC
		(2) Check for loose				V, W and earth	(2), (3) No fault.	class megger
		screws and bolts.				terminal with
		(3) Check for overheat		"		megger.
		traces on the parts.				(2) Retighten.
		(4) Clean.		"		(3) Visual check.
		(1) Check conductors		"
	Conductors,	for distortion.
		(2) Check cable		"		(1), (2) Visual check.	(1), (2) No fault.
	cables
Main circuit		sheaths for
		breakage.
	Terminal block	Check for damage.		"		Visual check	No fault
		(1) Check for chatter		"
	Relay	during operation.				(1) Auditory check.	(1), (2) No fault.
		(2) Check for rough		"		(2) Visual check.
		surface on contacts.
						(1) Visual check.
		(1) Check for crack in		"		Cement resistance,
	Resistor	resistor insulation.				wire-wound resistor.	(1) No fault.
		(2) Check for open		"		(2) Disconnect one end	(2) Indication
		cable.				and measure with
						tester.
		(1) Check balance of		"		(1) Measure voltages
		output voltages
						across the inverter	(1) Phase-to-phase
		across phases with
						output terminals U-	voltage balance
Control cir-		the inverter						Digital
cuit	Operation	operated alone.				V-W.	within 4V (8V) for	multimeter,
Protective	check	(2) Perform sequence		"		(2) Simulatively short or	200V (400V).	rectifier type
						open the protective	(2) Fault must occur
circuit		protective operation						voltmeter
		test to ensure no				circuit output	because of
						terminals of the	sequence.
		fault in protective
						inverter.
		and display circuits.
		(1) Check for unusual	"			(1) Turn by hand with
Cooling		vibration and noise.					No unusual vibration
	Cooling fan				"	power off.
system		(2) Check for loose	"	"			and noise.
		connection.				(2) Visual check.

ERRORS AND PROTECTIVE FUNCTIONS

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