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    Why is the measured mains voltage does not match the mains voltage readings according to the HMI on ATV61 or ATV71?

    Issue:
    Why is the measured mains voltage does not match the mains voltage readings according to the HMI on ATV61 or ATV71?

    Product line:  
    Altivar ATV61 and ATV71

    Environment: 
    All models, all serial numbers

    Cause:
    Flat topping on the input AC waveform. 

    Resolution:  
    The HMI's Mains Voltage reading is a calculation of the Mains Voltage, by reading the DC bus. It is calculated by taking the DC bus value and dividing it by the square root of 2.

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