Cleveland Range inverter How to Check Power Components, Troubleshooting & Maintenance, Elements

Chapter 6 - Troubleshooting & Maintenance

6.5 How to Check Power Components

Before checking the power components, be sure to disconnect AC Input supply and wait until the Main Electrolytic Capacitors (DCP-DCN) are discharged to safe voltage levels.

			Contactor		DCP
			Charge resistor		B1		TR1	TR3	TR5
D1	D2	D3				G	G		G
R				+	B2	E	E		E
			Electrolytic						U
S									V
			capacitors
T					G
	D5	D6					TR4	TR6	W
D4					E				TR2
						G	G		G
						E	E		E
					DCN	Current Sensing Resistor

1)Disconnect the power input line (R, S, T) and the inverter output to the motor (U, V, W).

2)Verify whether the inverter terminal R, S, T, U, V, W, B1, B2 is shorted or open by changing the polarity of the tester.

3)Verify capacitor has discharged before testing.

4)The tester should display several mega-ohms when open. The tester can display terminal is shorted for a short time and then display several mega-ohms because of the electrolytic capacitor. The tester should display 1 Ω ~ 10 Ω when terminal is shorted. If all measured values are about the same, individual modules are OK.

4) Diode module and IGBT module checking points:

Elements		Test Polarity		Measured	Element	Test Polarity		Measured
		+	-	Value		+	-	Value
	D1	R	B1	Short	D4	R	DCN	Open
Diode		B1	R	Open		DCN	R	Short
	D2	S	B1	Short	D5	S	DCN	Open
Module		B1	S	Open		DCN	S	Short
	D3	T	B1	Short	D6	T	DCN	Open
		B1	T	Open		DCN	T	Short
	Tr1	U	B1	Short	Tr4	U	DCN	Open
IGBT		B1	U	Open		DCN	U	Short
	Tr3	V	B1	Short	Tr6	V	DCN	Open
Module		B1	V	Open		DCN	V	Short
	Tr5	W	B1	Short	Tr2	W	DCN	Open
		B1	W	Open		DCN	W	Short

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