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    What is the SOF (Overspeed) fault on the Altivar Process Drive?

    Issue:
    What is the SOF (Overspeed) fault on the Altivar Process Drive?

    Product Line:
    Altivar Process Drive (ATV630, ATV930, ATV650, ATV950, ATV660, ATV960, ATV680, ATV980)

    Environment:
    All serial numbers for Altivar Process Drive

    Cause:
    N/A

    Resolution:
    Principle
    This fault appears when an overspeed is present on the drive.

    Probable Cause
    • Instability or driving load too high
    Remedies
    • In the Motor parameters menu (5 Complete Settings -> 5.2 Motor parameters):
      •  Try changing the [Dual rating] to Heavy Duty
      •  Try changing the [Motor control type] to U/F VC Standard (available on the ATV6xx)
    • Check the motor, gain and stability parameters.
    • Check the size of the motor/inverter/load.
    • Add a braking resistor.

    Note: We've seen a few instances where just changing the two parameters in the Motor parameters menu have corrected the issue. However, please be aware that changing the drive to heavy duty de-rates the drive by one HP class.
    Example: A 50HP drive would now be a 40HP drive

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