| 摘要 |
<p>PURPOSE:To prevent the malfunction at the last output stage accident by providing a circuit opening and closing means which is freely switchable in the middle of a circuit which connects the actuator and operation switch which are arranged at the places separated from a controller respectively. CONSTITUTION:Relays 38 and 38 which are freely switchable for supplying and locking power current for electromagnetic solenoids 27 and 28 along with the switching operation of a change-over switch 26. Therefore, since power current is supplied to only the solenoids 27 and 28 whose operation are elected by the changeover switch 26, drive current is prevented from continuously flowing even when a transistor Tr1 which is controlled by the signal from a controller 25 and a transistor Tr2 for detecting short circuit are erroneously turned on. In addition, the relays 38 and 38 are installed in the relay section at the middle between the switch 26 and the controller 25. Therefore, even if electricity is not conducted to the last output stage of a drive circuit due to short circuit, malfunction does no occur.</p> |
