| 摘要 |
PURPOSE:To stop feeding forcedly even in a feeding period to a load, and let a normal action by a thermosensitive sensor restored after stoppage of feeding. CONSTITUTION:A timer circuit 26 is started by an output of a signal determination circuit 24 when a heat source is detected by a thermosensitive sensor connected with a signal terminal T1. A contact r1 is put on to feed a load during a time limit action of the timer circuit 26. An input circuit 29 for setting an output at an H level in a period while a switch connected with a terminal T5 is kept on is provided. Switching of a NOR circuit NOR4 as a gate is controlled by an output of the input circuit 29. When the output of the input circuit 29 gets to the H level during the time limit action of the timer circuit 26, the gate is closed to prohibit the timer circuit 26 from outputting. A contact r2 gets off at this time, and feeding to the load connected with a load terminal T3 is stopped. When a heat source is detected by the thermosensitive sensor, the timer circuit 26 is started, and feeding to the load is restarted. |
