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    What are possible causes of SCF1 motor short circuit faults on the ATV61 and ATV71?

    What are possible causes of SCF1 motor short circuit faults on the ATV61 and ATV71?

    Product Line:
    ATV71 Altivar 71


    SCF1 [Motor short circuit]     Short-circuit or grounding at drive output

    • Check the cables connecting the drive to the motor, and the motor’s insulation
    • Perform tests via the [1.10 DIAGNOSTICS] menu.​
    • Run the drive open circuit (with the motor disconnected and OPL turned off) and check the drive's output terminals for balanced voltages phase to phase
    • Perform a diode check between U,W,V and PA+ PC-. Then measure between L1, L2, L3 and PA+ and PC-:
    NOTE: This step should be performed when no line voltage is present on the drive. Power down the drive before performing this step. 
    -Measure (using your meter's diode  scale) in one direction, then swap your leads and measure again
    -You should see 'OL' in one direction and a small voltage reading (approximately 0.3-.0.5V) in the other direction

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