The photoswitches two beams sunlight insensitive (PNP) are used in elevators of two speeds, one beam serves to give the impulse of change of speed and the other beam as conditioner to know if the screen is short or long.
The photoswitches two beams static output (PNP) are used in elevators of two speeds, one beam serves to give the impulse of change of speed and the other beam as conditioner to know if the screen is short or long.
The two beam photoswitches are designed for two speed lifts; just one photoswitch gives change of speed or stopping signals.One beam is used for a change of speed, and the other to know whether the barrier is short or long.