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[ IX Troubleshooting ]
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HWE09120 GB
(6) Diode stack (P96, P120, P144 models)
Measure resistances between each pair of terminals on the diode stack with a tester, and use the results for troubleshoot-
ing.Refer to (5) " Intelligent power module (IPM) " for notes on measurement and tester selection.
(7) Troubleshooting for IGBT Module
Measure the resistances between each pair of terminals on the IGBT with a tester, and use the results for troubleshooting.
The terminals on the INV board are used for the measurement.
1) Notes on measurement
Check the polarity before measuring. (On the tester, black normally indicates plus.)
Check that the resistance is not open ( ohm) or not shorted (to 0 ohm).
The values are for reference, and the margin of errors is allowed.
The result that is more than double or half of the result that is measured at the same measurement point is not allowed.
Disconnect all the wiring connected the INV board, and make the measurement.
2) 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 volt-
age is low.)
Use a low-range tester if possible. A more accurate resistance can be measured.
Judgment value (reference)
Black ( + ) External view
+ (P) - (N) to (L1) to (L2) to (L3)
Red (-)
+ (P) - - 5 - 200
ohm
5 - 200
ohm
5 - 200
ohm
- (N) - -
to (L1) 5 - 200
ohm
---
Internal circuit diagram
to (L2) 5 - 200
ohm
---
to (L3) 5 - 200
ohm
---
L1 L2 L3
+
-
L1
L2
L3
[TJMU-A]