Mitsubishi Electric PUHY-P200 Service Handbook page 148

(5) Intelligent power module (IPM)
Measure resistances between each terminal of IPM with tester, and use the results for troubleshooting
Notes on measurement
• Make sure the polarity before the measurement. (On the tester, black normally indicates plus.)
• Make sure that the resistance is not open (∞Ω) or not shorted (to 0Ω).
• For the resistance, the margin of error is allowed.
• The result that is more than double or half than the result that is measured at the same measurement point
is not allowed.
Tester restriction
• Use the tester whose internal electrical power source is 1.5V or greater.
• Use the dry-battery-powered tester.
(✻The accurate diode-specific resistance cannot be measured with the button-battery-powered card tester,
as the applied voltage is low.)
• Use the range that measures low resistance as much as possible.
The more accurate resistance can be measured.
• External view
• Judgement value
Black
(+)
P N
Red
(–)
P –
N –
∞
U
5~200Ω
∞
5~200Ω
V
∞
W
5~200Ω
(6) Diode stack
Measure resistances between each terminal of diode stack with tester, and use the results for troubleshooting.
Refer to (5) " Intelligent power module (IPM) " for notes on measurement and tester restriction.
1 2
1
2
3
U V W
16 10 7 4 1
U V
5~200Ω 5~200Ω 5~200Ω
∞ ∞
–
–
– –
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
15
Pre-Driver
∞
12
–
Over heating
–
16
protection circuit
• Judgement value
Black
(+)
+ (P)
Red
(–)
+ (P)
- (N) –
∞
~ (1)
∞
~ (2)
∞
~ (3)
- 146 -
P
U
V
W
B
N
Temperature sensor
- (N) ~ (1) ~ (2)
– 5~200Ω 5~200Ω
∞ ∞
–
5~200Ω
–
5~200Ω
– –
5~200Ω
~ (3)
5~200Ω
∞
–
–