Was doing work at a business yesterday that I hadn't done work at before, so I wasn't totally up to speed on the buildings layout. In addition to some miscellaneous repairs they asked me to look at the outside light by the front door as it wasn't on when the head guy got to work that am.
Long story short, when I looked into how the outside lights were controlled I found a photo-eye and a timer-clock set up in series with each other to control a contactor. I'm trying to understand the design thoughts that would go into setting this up in that manner.
I can see the photo-eye and timer-clock being setup in parallel so that if you had a really dark day (stormy, cloudy, etc.) it would turn the lights on outside, or the timer-clock would turn the lights on at pre-set clock times (night-time).
I'm not sure I understand the benefits of setting them up in series. Can someone tell me what I'm not seeing?
Thanks, Sky
Long story short, when I looked into how the outside lights were controlled I found a photo-eye and a timer-clock set up in series with each other to control a contactor. I'm trying to understand the design thoughts that would go into setting this up in that manner.
I can see the photo-eye and timer-clock being setup in parallel so that if you had a really dark day (stormy, cloudy, etc.) it would turn the lights on outside, or the timer-clock would turn the lights on at pre-set clock times (night-time).
I'm not sure I understand the benefits of setting them up in series. Can someone tell me what I'm not seeing?
Thanks, Sky