Determining Argon hardware failure

If Argon (servo drive) refuses to operate in any meaningful way, it is good to perform few tests for the hardware to identify possible hardware failures.

Testing power stage

Motor power stage and braking resistor output consists IGBT transistors that typically short circuit if they are damaged. Testing of such failure needs only a multimeter with resistance measurement function.

1. Unplug all connectors from the drive at least 30 minutes before testing as residue voltages may disturb this test and pose a danger. After 30 minutes fully disconnected, ensure that voltage has been safely discharged.
2. Measure resistance between J4 pin VN against BR,U,V and W. A typical resistance is between 100 kΩ - 10 MΩ. If resistance is less than 10 kΩ, there may be a failed IGBT.
3. Measure resistance between J4 pin VP against BR,U,V and W. A typical resistance is between 100 kΩ - 10 MΩ. If resistance is less than 10 kΩ, there may be a failed IGBT.

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