| 摘要 |
PROBLEM TO BE SOLVED: To provide an AC motor controller which can confirm in advance whether or not a current detector is normally connected to an output terminal of a power converter.SOLUTION: An AC motor controller includes: a power converter which converts supplied power into power of a variable voltage variable frequency to drive an AC motor at variable speeds; a PWM controller which controls a power conversion function of the power converter; and a current detector abnormality determination device having abnormality determination voltage command calculation means which outputs a voltage command signal for determining abnormality of a current detector which detects a current flowing in the AC motor and abnormality determination means which determines abnormality of the current detector by the pattern of the current obtained from the current detector by applying the voltage command signal to the current converter. On the basis of an external command signal and the detection signal of the current detector, the PWM controller supplies the control signal to the power converter and the current detector abnormality determination device outputs abnormality display in the case in which it determines that the current detector has abnormality before the operation of the AC motor. |
