| 摘要 |
PURPOSE:To avoid that a timer is set by mistake when a power supply is applied in case an ordinary timer circuit put on the market is used, by providing a resetting circuit to a flip-flop for timer setting signal. CONSTITUTION:When a main switch 2 is applied, a flip-flop 10 is forcibly reset by a reset pulse generating circuit 28. This action prevents that a timer circuit 9 is set by mistake. When a timer setting indication signal is supplied to a remote control reception circuit 7, the flip-flop 10 sets the setting signal at a high level to actuate the circuit 9. Then a relay switch 5 is opened by a transistor 12 and a relay coil 11F after a fixed period of time. Thus the supply of a main current is cut off. Here the timer actuation is continued by a delay circuit 31 as long as a service interruption lasts in a short time. |
