Verfahren zur Fehlererkennung bei der Ansteuerung eines Drehfeldmotors

摘要

The method involves controlling phase voltages (Ua-Uc) of a polyphase motor (M) with a frequency converter. Phase currents (Ia-Ic) of the polyphase motor are measured in a rest state. The phase currents or current variables derived by a closed-loop control are adjusted to a predetermined setpoint current variable. Response of the closed-loop control to an interference voltage variable is observed. Determination is made to check whether a fault exists in the frequency converter and the phases of the polyphase motor based on the response of the closed-loop control.