Frequently asked questions
Why is the measured mains voltage does not match the mains voltage readings according to the HMI on ATV61 or ATV71?
FA173966
28 September 2021
Issue:Measured Mains Voltage does not match the Mains Voltage readings of HMI on ATV61/71
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.