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ATV61 measured mains voltage does not match the HMI Mains voltage reading

Issue:  ATV61 measured mains voltage does not match the HMI Mains voltage reading  
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 votage reading is a measurement of the DC bus  not a measurement of L1 L2 L3.   Calculate the Mains voltage by taking the DC bus value and divided it by the square root of 2.
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