Mitsubishi Electronics PURY-P400, P500YMF-C Intelligent Power Module IPM, Diode stack, Tester ⊕

Intelligent Power Module (IPM)

Measure resistances between each terminal of IPM with tester, and use the results for troubleshooting. Specified resistance value is dependent on tester type to be used for resistance measurement, because diode inside IPM has non-linearity, thus difference of impedance and voltage in tester being influential. As the internal impedance of resistance range of analog tester equals to the center value of meter indication, the affect of internal impedance can be minimized if the tester having close center value of resistance range. Because internal voltage is normally 1.5V, the tester to be used for troubleshooting of IPM should satisfy the following conditions.

Internal voltage	1.5V (Power source : one dry cell battery)
Central value of resistance range	10 ~ 40Ω

The measured values for troubleshooting are shown in the table below. (Use the minimum range for tester resistance range.)

• External view

• Internal circuit diagram

1 4 7 10 16

B

P

3

2

1

6

5

4

9

Pre-Driver

Pre-Driver

N

W V U

• Judged value

Tester
+	P	U	V	W	N
Tester –
P		∞	∞	∞	∞
U	2~				∞
	100Ω
V	2~				∞
	100Ω
W	2~				∞
	100Ω
N	2~	2~	2~	2~
	100Ω	100Ω	100Ω	100Ω

8Pre-Driver

7
11
13	Pre-Driver
10
14	Pre-Driver
15	Pre-Driver
12

16	Over heating
	protection circuit

P

U

V

W

B

N

Diode stack

Perform continuity check with tester. Judged as normal if the following characteristics are observed. (Use the minimum range for tester resistance range.)

	Tester ⊕	+	–
Tester -
1		10~50Ω	∞
2		10~50Ω	∞
3		10~50Ω	∞

				Tester -	+	–
1	2	3	Tester ⊕
			1		∞	10~50Ω
		+	2		∞	10~50Ω
			3		∞	10~50Ω
1
2
3
		–

–75–