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Timing circuit issue

Reloadron

Reloadron

Joined Jan 15, 2015
7,523
OK, below is a rough drawing that should do as you want. It can easily be modified and changed. The timer in the drawing is a NCC (National Controls Corporation) TMM-0999 Timer 24 Volt version. You can use any One Shot and configure accordingly. I used the timer I did because I used that version extensively in designs. While overkill in this circuit I worked with quite a few timing applications. Using this version I had a one timer fits just about all so having spares was easier. Macromatic and NCC both make a wide range of timers. The timer as drawn is a Non Retriggerable setup. The relays are Omron MKS series DPDT with 24 VDC coils. Use whatever you choose. Again, you can configure the timer however you wish. I like having a lamp always on when an alarm condition exist.

Ron

Alarm Audible Timer.png
 
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