how does a vfd save power
Because the VFD is a power converter, this means that the input current is (assuming a 0.89 input power factor from a 3% line impedance): Iin = (39.4kW) / (â3 x 460V x 0.89) = 55.6A. Because the VFD is operating at half speed and under full load, the input current is less than half of the output current.