Device for automatically switching-off the lights in the bathroom (dressing) room are designed to seamlessly allow the following situations:
1. In the served room is unoccupied, the door is closed or locked from the outside, the light is not lit.
2. Still in the bathroom (the toilet) no one. However, the door is open and lights are on. This situation occurs when the mean in the bathroom (toilet) for something: for example, a rag or a bucket or to execute the cleaning.
3. Inside behind a locked door is a man and the light in this room must be turned on (lit lamp ЕL1).
Based on current specific situation and the corresponding action sequence of the automatic light control. In particular, the situation set out above under the paragraph 2 logically leads to the proposed scheme (Fig. a) simple, clear algorithm when the device (it is usually a bolt), locking the door, pressed the catch button switch SV1 (Fig. b), thus providing the circuit open relay coil K1.
And what about the “limit” SV2? Contact pair 1 — 3 it is open, as designated push-button head secured on a door (which in this case open) pressure plate bracket. The result — the relay is deenergized and lamp not included.