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Sparky
Joined: 17 Dec 2010 Posts: 217 Location: Muir Beach, California
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Link Posted: Thu Apr 14, 2011 5:15 am Post subject: One alarm/light with (2) inputs |
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I am wiring up my 60amp build that will have some of the Kal setup, BUT with (2) timers since I will be doing back-to-back batches. So, my question is that I will only have (1) buzzer/light, and I want it to be activated by two sources (both timers).
Originally, I thought I would put a diode in both lines to block the back-feed, but am having a hard time finding a 120V diode. Any help? Here is the Kal setup (picture below). I want to add a timer and split it, BUT only have (1) buzzer/light.
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milldoggy
Joined: 23 Dec 2010 Posts: 569 Location: Pottstown, PA
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Link Posted: Thu Apr 14, 2011 7:16 am Post subject: |
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Can't you just add it like the existing timer or pid? Jump power to it from the existing timer just like power coming from the pid on kals timer.
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kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11116 Location: Ottawa, Canada
Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter
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crush
Joined: 28 Dec 2010 Posts: 706 Location: Telemark, Norway
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Link Posted: Thu Apr 14, 2011 1:40 pm Post subject: |
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Sparky - just extend the existing circuit, adding more sources and switches in parallel with the alarm. I'm also including 2 timers, and perhaps an alarm from the pumps when they are dry (if it work out ok with an inline water sensor).
Since the new buzzers are illuminated, the alarm lamp is kind of redundant. I'm thinking about having the alarm lamp as a "alarm active" indicator that comes on when an alarm switch is turned into the on position.
_________________ ...just one more.
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Sparky
Joined: 17 Dec 2010 Posts: 217 Location: Muir Beach, California
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Link Posted: Thu Apr 14, 2011 11:54 pm Post subject: |
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I'm worried about the 120V back-fed into the other timer, especially if the switches are on.
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kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11116 Location: Ottawa, Canada
Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter
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Sparky
Joined: 17 Dec 2010 Posts: 217 Location: Muir Beach, California
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Link Posted: Fri Apr 15, 2011 3:51 am Post subject: |
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I have (2) timers and (2) resets, but (1) buzzer/light.
I am going to have the boil/timer/reset on it's own, but going to the (1) buzzer/light.
The other one will have the HLT, MLT + timer and it's own reset also going to the buzzer/light.
I just don't want to 120V back-feeding to the other timer (when it is not tripped) and having it damage the unit or PID's.
Sorry, hope that explains it. I am too busy with work to draw up a schematic!
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crush
Joined: 28 Dec 2010 Posts: 706 Location: Telemark, Norway
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Link Posted: Fri Apr 15, 2011 6:58 am Post subject: |
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Sparky, I hope I can explain.
When the 2nd timer is not producing an alarm signal and its alarm relay is open, it doesn't matter if you put 120v on the NO side of the relay when open, it simply doesn't go anywhere - it's an open circuit. So, other alarms don't create any problems for devices not producing an alarm.
When the 2nd timer produces an alarm and closes the relay, it closes the relay with the input supply. If there is already 120v on the line, it connects with the same source. (Everything ultimately comes from the same source - the power line in.)
There is no backfeeding since both come from the same source, and it's AC. Instead, when a 2nd alarm closes both the existing 120v from another timer/PID and the 120v from the new alarm combined and flow to neutral, which is via the buzzer in this case.
If this were a DC circuit, then I can understand that a diode might help, but not here, since it's AC. It's fine to extend Kal's design.
_________________ ...just one more.
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Sparky
Joined: 17 Dec 2010 Posts: 217 Location: Muir Beach, California
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Link Posted: Sat Apr 16, 2011 4:54 pm Post subject: |
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D'oh! Of course, don't know what I was thinking. Maybe my head is wrapped around my work and having various DC and AC sources to contend with.
Thanks Crush, Kal, and MildDoggy!
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