Mitsubishi Electric CITY MULTI PUHY-P200YEM-A Service Handbook page 94

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 v alues for troubleshooting are shown in the table below.
• External view
• Judged value
Tester
6) Diode stack
P erform continuity check with tester. Judged as normal if the following characteristics are observed.
(Restrictions to applicable tester are the same as those of IPM)
1 2
1
2
3
U V W
16 10 7 4 1
Tester
Black
P N U V
Red
5~ 5~
200 Ω 200 Ω
P
∞ ∞
N
5~
∞
U 200 Ω
5~
∞
V
200 Ω
5~
∞
W 200 Ω
3
+
–
• Internal circuit diagram
3
2
Pre-Driver
N
1
6
5
Pre-Driver
P
4
9
8
Pre-Driver
B
7
11
13
Pre-Driver
10
14
Pre-Driver
W
5~ 15
Pre-Driver
200 Ω
∞
12
Over heating
16
protection circuit
Tester
Black
Tester
Red
+
–
1
2
3
- 93 -
P
U
V
W
B
N
Temperature sensor
+ –
1 2 3
5~ 5~ 5~
200 Ω 200 Ω 200 Ω
∞ ∞ ∞
5~
∞
200 Ω
5~
∞
200 Ω
5~
∞
200 Ω