When the frequency changer has malfunction, power frequency is adopted, and the motor speed is nonadjustable.
万一变频器出现故障时，可工频驱动，转速不可调。
Frequency changer
英语例句库
英语百科
Frequency changer
A frequency changer or frequency converter is an electronic or electromechanical device that converts alternating current (AC) of one frequency to alternating current of another frequency. The device may also change the voltage, but if it does, that is incidental to its principal purpose.
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