HP 30 30 manual How to Check Power Components, Elements Test Polarity Measured Value

Chapter 8 - Troubleshooting & Maintenance

8.4 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) is discharged.

ContactorP1

DCP+

Charge resistor

D1 D2 D3

R	Electrolytic	+
S
	capacitors
T

D4 D5 D6

N

P2			Tr5		Tr3		Tr1
B1
		G		G		G
B2		E		E		E
							U
G							V
							W
E		G		G		G
	N	E	Tr2	E	Tr6	E	Tr4
			Dynamic Braking Unit (Option) for 15~30HP models

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 (or P/L1), N 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 x Ω ~ xx 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	DCP+	Short	D4	R	N	Open
Diode		DCP+	R	Open		N	R	Short
	D2	S	DCP+	Short	D5	S	N	Open
Module		DCP+	S	Open		N	S	Short
	D3	T	DCP+	Short	D6	T	N	Open
		DCP+	T	Open		N	T	Short
	Tr1	U	B1	Short	Tr4	U	N	Open
IGBT		B1	U	Open		N	U	Short
	Tr3	V	B1	Short	Tr6	V	N	Open
Module		B1	V	Open		N	V	Short
	Tr5	W	B1	Short	Tr2	W	N	Open
		B1	W	Open		N	W	Short

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