| 摘要 |
PURPOSE:To prevent a motor from being erroneously controlled at a power source recovery time after a power interruption by providing a quasi-signal forming unit which outputs a quasi-retrieving signal to any retrieving input terminal at abnormally stopping time. CONSTITUTION:An identification controller 2a provided in a processor 2 sets and resets flip-flops FFa, FFb in response to the rotation command signal of a command switch unit 1 and the rotation retrieving signal of a retrieving switch unit 3, and outputs a signal to a normal rotation output terminal or, a reverse rotation output terminal ol and a stop output terminal os. When a power is interrupted in the state that any of the switch sb of the switch unit 3 is not to any of retrieving contacts x, y and z, a quasi-retrieving signal is inputted to the second retrieving input terminal y'. Accordingly, a motor is controlled in rotation until the switch sb is switched to the prescribed position at the power source recovery time. |
