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  1. S

    Motor VFD open loop no-load current is much higher than closed loop no-load current. Why?

    The back EMF voltage of a PM motor is directly determined by the rotational speed so RPM is determined by the voltage. This requires the VFD to run with the correct Volts/RPM or Volts/HZ ratio. If that is set too high, the motor will consume additional current until the resistive drops equalize...

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