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How ATV212 drives measure the Line voltage.

ATV212 drive does not measure directly the line voltage. it measures only the DC bus voltage.
Drive estimates Line voltage (FE04); For Example:  if you measure the DC bus voltage = 301 Vdc.
Then DC bus voltage = 1.414 x Line voltage
Line voltage =DC bus voltage/1.414 = 301/1.414 = 212.8 V
The drive estimates that the line voltage is closed to 213Vac.
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