Mitsubishi Electronics FR-A500L instruction manual Preparation, Checking method

PROTECTIVE FUNCTIONS

zChecking the inverter and converter modules

<Preparation>

(1)Disconnect the external power supply cables (R, S, T) <L1, L2, L3> and motor cables (U, V, W).

(2)Prepare a tester. (Use 100Ω range.)

<Checking method>

Change the polarity of the tester alternately at the inverter terminals R, S, T, U, V, W, P and N <L1, L2, L3, U, V, W, + and ->, and check for continuity.

Note: 1. Before measurement, check that the smoothing capacitor is discharged.

2.At the time of continuity, the measured value is several to several ten’s-of ohms depending on the module type, circuit tester type, etc. If all measured values are almost the same, the modules are without fault.

<Module device numbers and terminals to be checked>

		Tester Polarity			Measured			Tester Polarity		Measured
					Value					Value
module	D1	R<L1>		P<+>	Discontinuity		D4	R<L1>	N<->	Continuity
		P<+>		R<L1>	Continuity			N<->	R<L1>	Discontinuity
	D2	S<L2>		P<+>	Discontinuity		D5	S<L2>	N<->	Continuity
Converter
		P<+>		S<L2>	Continuity			N<->	S<L2>	Discontinuity
	D3	T<L3>		P<+>	Discontinuity		D6	T<L3>	N<->	Continuity
		P<+>		T<L3>	Continuity			N<->	T<L3>	Discontinuity
module	TR1		U	P<+>	Discontinuity		TR4	U	N<->	Continuity
		P<+>		U	Continuity			N<->	U	Discontinuity
	TR2		V	P<+>	Discontinuity		TR6	V	N<->	Continuity
Inverter		P<+>		V	Continuity			N<->	V	Discontinuity
	TR5		W	P<+>	Discontinuity		TR2	W	N<->	Continuity
		P<+>		W	Continuity			N<->	W	Discontinuity
		Converter module			P<+>	Inverter module
						TR1	TR3	TR5
		D1	D2	D3
	R				C				U
	<L1>
	S								V
	<L2>
	T								W
	<L3>
		D4	D5	D6
						TR4	TR6	TR2
					N
					<->

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