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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
      • Using a 1,000V Megger, test the motor and leads
      • Check for tight wiring connections
    • Perform tests via the [1.10 DIAGNOSTICS] menu.​
      • [Diagnostics] -> [Test Procedures] -> Thyristors Test and Transistor Test
    • Run the drive open circuit (with the motor disconnected, OPL turned off, and Motor Control Type set to V/F 2pts) and check the drive's output (T) terminals for balanced voltages phase to phase
      • ​[1.8 Fault Management] -> [Output Phase Loss] -> set to 'No' 
      • [1.4 Motor Control] -> [Motor control type] -> set to 'V/F 2pts'
    • 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
    Measure between PA+ to L1,L2,L3 and between PC- to T1,T2,T3 (total of 6 measurements on the input and 6 measurements on the output)
    -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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