Mitsubishi Electronics PURY-P400, P500YMF-C specifications Ipm

6) Troubleshooting at breaker tripping

	Check items		Measures to be taken
1 Check the breaker capacity.		The breaker’s capacity should be correct to “System
		design” in data book.
2 Check for a short circuit or grounding in the electrical		Correct any defects.
system other than the inverter.
3 Check the resistance between terminals on the terminal		Check each part inside the inverter power circuit
block TB1A for power source.			(resistance, megohm or the like).
		a)	Diode stack
	1 0 ~ several ohms or improper megohm value		Refer to “Troubleshooting of diode stack.”
		b)	IPM
			Refer to “Troubleshooting of IPM.”
4 Checking by powering again.		c)	Rush current protection resistor
		d)	Electromagnetic contactor
	1 Main power source circuit breaker tripping	e)	DC reactor
		*	For c) ~ e), refer to “Individual Parts Failure Judge-
			ment Methods.”
	2 No display of remote controller
5 Operational check by operating air conditioner
	1 Normal operation without breaker tripping.	a)	As there is a possibility of instantaneous short
			circuit generated, find the mark of the short circuit
			for repair.
		b)	When a) is not applicable, the compressor may be
			faulty.
	2 Breaker tripping		The ground fault of inverter output/compressor can
			be supposed.
			Disconnect the wiring to the compressor and check
			the insulation resistance of the following parts with
			a megger.
		a)	Compressor terminals.
		b)	Inverter output.

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