| 摘要 |
PURPOSE:To reduce leakage current in a leakage preventive device for an inverter device by detecting the leakage current and in comparison with its allowable value by controlling the frequency of false alternating current from the result. CONSTITUTION:In what is housed in the main body and converts AC into DC and then again this DC into false AC and drives a motor in variable speed, the leakage current leaking from a motor to earth between the main body and an inverter device is detected. In comparison of this leakage current with its allowable value the result thus compared is outputted. By this output signal the frequency of the false AC is controlled. The leakage current can thereby be reduced with an inexpensive device. |
