Mitsubishi Electric PQRY-P200YEM-A Service Handbook page 101

(5) Intelligent Power Module (IPM)
Measure resistances between each terminal of IPM with tester, and use the results for troubleshooting.
1 Focus 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.
2 Restrictions 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.
The measured values for troubleshooting are shown in the table below.
• External view
• Judged value
Tester
Red
(6) Diode stack
Perform continuity check with tester. Judged as normal if the following characteristics are observed.
1 2
1
2
3
U V W
N
P
B
16 10 7 4 1
Tester
Black
P N U V
5~ 5~ 5~
P
200Ω 200Ω 200Ω
∞ ∞
N
5~
∞
U
200Ω
5~
∞
V
200Ω
5~
∞
W
200Ω
3
+
–
• Internal circuit diagram
3
2
Pre-Driver
1
6
5
Pre-Driver
4
9
8
Pre-Driver
7
11
13
Pre-Driver
10
14
Pre-Driver
W
15
Pre-Driver
∞
12
Over heating
16
protection circuit
Tester
Black
Tester
Red
+
—
1
2
3
–100–
P
U
V
W
B
N
Temperature sensor
+ —
1 2 3
5~ 5~ 5~
200Ω 200Ω 200Ω
∞ ∞ ∞
5~
∞
200Ω
5~
∞
200Ω
5~
∞
200Ω