Mitsubishi FR - S500 Checking the inverter and converter modules Preparation, Checking method

Checking the inverter and converter modules <Preparation>

(1)Disconnect the external power supply cables (R, S, T) and motor cables (U, V, W).

(2)Prepare a meter. (Use 100Ω range.)

<Checking method>

Change the polarity of the meter alternately at the inverter terminals R, S, T, U, V, W, P and N, and check for continuity.

CAUTION

Before measurement, check that the smoothing capacitor is discharged.

At the time of continuity, the measured value is several to several ten's-of ohms depending on the number of modules, number of parallel modules, 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
Converter module	D1	R	P		Discontinuity			D4	R	N	Continuity
		P	R		Continuity				N	R	Discontinuity
	D2	S	P		Discontinuity			D5	S	N	Continuity
		P	S		Continuity				N	S	Discontinuity
	D3	T	P		Discontinuity			D6	T	N	Continuity
		P	T		Continuity				N	T	Discontinuity
	TR1	U	P		Discontinuity			TR4	U	N	Continuity
Inverter module		P	U		Continuity				N	U	Discontinuity
	TR3	V	P		Discontinuity			TR6	V	N	Continuity
		P	V		Continuity				N	V	Discontinuity
	TR5	W	P		Discontinuity			TR2	W	N	Continuity
		P	W		Continuity				N	W	Discontinuity
								(Assumes the use of an analog meter.)
		Converter				P
		module					Inverter module
							TR1	TR3	TR5
		D1	D2	D3
		R				C				U
		S								V
		T								W
		D4	D5	D6
							TR4	TR6	TR2
						N
REMARKS
The FR-S520S-0.1K to 1.5K and FR-S510W-0.1K to 0.75K do not have T, D3 and D6.

153