Intelligent Power Module (IPM)
The measured v
Measure resistances between each terminal of IPM with tester, and use the results for troubleshooting.
alues for troubleshooting are shown in the table below.
Diode stack
P
(Restrictions to applicable tester are the same as those of IPM)
erform continuity check with tester. Judged as normal if the following characteristics are observed.
123
1
2
3
+
–
W
• External view • Internal circuit diagram
• Judged value
∞
∞
∞
P
P
Tester
Black
N
5~
200
Ω
5~
200
Ω
5~
200
Ω
5~
200
Ω
5~
200
Ω
5~
200
Ω
U
V
W
NUVW
∞
∞∞∞
∞
∞
++Tester
Black
—1
2
3
—123
N
P
B
V
V
U
P
W
N
B
U
3
2
1
6
5
4
9
8
7
11
13
10
14
15
12
16
Pre-Driver
Pre-Driver
Pre-Driver
Pre-Driver
Pre-Driver
Pre-Driver
Over heating Temperature sensor
protection circuit
16 10 7 4 1
1Focus on whether there is a complete open (∞Ω) state or short-circuit (
~
0Ω).
The measured resistance value is a guideline and may deviate slightly.
Measure between several similar measurement points.
If the value does not differ by more than double or half from the other points, then judge the state as OK.
2Restrictions to applicable tester
Use a tester with an internal power of 1.5V or more.
❇ Battery type tester
A card tester with button battery has a low applied voltage, so the resistance value of the diode characteristics
cannot be measured correctly.
Use a measurement range that measures the low resistance when possible. An accurate measurement with less
fluctuation will be possible.
5~
200
Ω
5~
200
Ω
5~
200
Ω
5~
200
Ω
5~
200
Ω
5~
200
Ω
Tester
Red
∞∞∞
Tester
Red
-
49
-