A: The minimum working voltage of 380V inverter switching power supply is 250V, We usually do not recommend using 220 V power supply to power on the 380V drive, because it will report undervoltage fault and can not run. Therefore, it is necessary to reduce the under voltage protection point in group P29, turn off the power failure and frequency reduction, and adjust the voltage points of over-voltage stall and energy consumption braking. VF control may not be a problem, if vector control is used, the performance may be reduced; the input and output current should not exceed the current marked by the original inverter.That is to say, the power should be reduced, need to derate the drive. If it is necessary to use this way in an emergency, please contact the INVT technical engineer.