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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?

    Measured Mains Voltage does not match the Mains Voltage readings according to the HMI on ATV61 or ATV71?

    Product line:  
    Altivar ATV61 and ATV71

    All models, all serial numbers

    Flat topping on the input AC waveform. 

    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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