3. Maintenance
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Example) Checking diode module and IGBT module
Checking Diode D2
1) Measure the resistance of D2 by placing the red lead (positive terminal of DMM) on S phase
and the black lead (negative terminal of DMM) on P.
If the resistance indicated on DMM is several hundred kΩ or less, it is acceptable.
2) Measure the resistance of D2 by placing the red lead from the positive terminal of DMM on P
and the black lead from negative terminal of DMM on S phase.
If the resistance indicated on DMM is MΩ, it is acceptable.
3) Measure the resistance of other diodes in the same way.
Before testing, check the discharge of electrolytic capacitor (DCP-DCN).
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