| 摘要 |
PURPOSE:To cope with a malfunction rapidly and suitably by interrupting a motor driving circuit if trip signals output when a momentary overcurrent flows are counted predetermined number within a predetermined period of time. CONSTITUTION:The output of a power source 51 is supplied to a motor CM through a power switch 52 and an inverter 3. Trip output means 69 outputs a trip signal when the output current of the inverter 3 exceeds a predetermined overcurrent value. In this case, reset means 61b is reset after the switch 52 is once interrupted, On the other hand, when the trip signal is output, timer means 61a starts operating, and count means 67 counts the number of the outputs of the trip signals. If the number of the counts becomes a predetermined value within the set time of the means 61a, stop means 61h stops the inverter 3. |
