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    Can an ATV680 Active Front End drive run with unbalanced input voltage?

    Issue:
    Can an ATV680 run with unbalanced input voltage?

    Product Line:
    Altivar 680 Process Drives

    Environment:
    All

    Cause:
    Site line voltage is unbalanced 

    Resolution:
    It is NOT recommended to operate an ATV680 AFE on a 480V power system with a voltage unbalance of 4% to 7.5%. This is far outside the specification of the drive.
    The mains voltage must comply with the requirements according to IEC 60038 and EN 50160: 
    - Unbalance between phases: < 2 % 
    - Total harmonic factor THD(v): < 10 % 
    - Maximum single harmonic: < 5 %
    With this supply voltage the drive complies with the specified THDi value.
     
    If the voltage unbalance is 2 … 4% the drive will work but the THDi value will be higher than specified. A voltage unbalance of more than 4% will harm the drive. The input IGBT might overheat and/or the fuses might blow due to unsymmetrical input current. There is also a risk of oscillations if the voltage controller is not able to keep DC bus voltage constant.
     

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