3. Maintenance
3.1.4 Checking the Input/Output Modules
How to check the diode module and IGBT module (SV004~075iG5A-2/4)
1) Disconnect all power cables (R,S,T) and motor output cables (U,V,W)
2) Before testing, check the discharge of electrolytic capacitor (DCP-DCN)
3) When the circuit is open, the DMM indicates a high resistance (several MΩ). In some situations the DMM may
indicate a closed circuit (low resistance) and then indicate a high resistance due to the capacitors. When the
circuit is closed, the DMM indicates a resistance of several hundred kΩ or less.
4) Displayed values may not be constant as they depend on the module and tester type. However, the value
measured between phases can be considered satisfactory if the measured value is within ±10%
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