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