Maintenance of Shandong Inverter: This is because the output waveform of the converter contains high-order harmonics, and leakage current will occur between the motor and the cable between the converter and the motor. The leakage current is much larger than that when the power frequency drives the motor, so this phenomenon occurs.
The leakage current of the output side of the converter is about three times as much as that of the power frequency operation. When the leakage current of the motor is applied, the action current of the leakage protector should be 10 times as much as that of the power frequency operation. Where the frequency converter is used, the protective switch (circuit breaker) with leakage protection function is not suitable. Because the output of the converter has high harmonics, if it is not the special frequency conversion cable and motor, then leakage current is inevitable, often more than 30 mA, so that leakage protection trips.