| 摘要 |
PURPOSE:To enable to stop a motor only when an overload is applied to the motor by setting the edge outputs of the rise and fall of start and inverted signals of the motor by the output of an overcurrent detector at a latch circuit. CONSTITUTION:An edge detector 7 detects the edges of a start signal and an inverted signal, and outputs to a gate 8. Since the outputs of an overcurrent detector 6 and the detector 7 are input through a gate 8 to the set terminal of a latch circuit 9, even if the latch circuit 9 is not latched even if an overcurrent is generated when the motor 5 is started, stopped and inverted. When the start, stop and inversion of the motor 5 are passed, the latch circuit 9 is latched when an overload is applied to the motor 5 to operate an ON/OFF circuit 3, and the motor 5 is stopped. Thus, only when the motor becomes overload state, the motor can be stopped. |
