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Old 06-17-2011, 02:44 PM   #1
shortyjacobs
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Aug 2009
Twin Cities, MN
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So I'm getting ready to wire up my RIMS system, and my current plan is to have two switches.

Switch one provides power to the pump, and power to switch 2. Switch 2 turns on the heater element circuit.

Both are just "On-Off" Toggle switches.

I'd love to have it so when I power cycled the pump, there would be a component (relay?) that would kill power to Switch 2 (which runs the heater) until I pressed a "reset" button or something.

So, process would be:
1) Turn on Switch 1, pump starts.
2) Depress "Reset" button, energizing Switch 2
3) Turn on Switch 2, heater starts.

This way, even if I accidentally leave switch 2 "On", and next time I brew I turn on Switch 1 and work on ensuring I have flow through the RIMS, the heater can't switch on, since the heater circuit would have reset to Normally Open upon power cycling the pump.

Make sense? So I need something that is NO until you give it a momentary jolt from a reset switch, and then it says Closed until it loses power, at which point it opens again. What would that component be called?

(Only way I can figure on it is to have some kind of fancy capacitor/timer/latching relay setup to do this, but that seems excessive).

Thanks all you EEs out there!
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Old 06-17-2011, 02:49 PM   #2
P-J
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Mar 2010
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Use a relay and wire it so that it is picked through a momentary contact (push button) and then remains energized through its own normally open contact. If power drops, it has to be reset again.

 
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Old 06-17-2011, 03:15 PM   #3
shortyjacobs
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Aug 2009
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Oh brilliant, never thought of having the relay feed off itself.

So, with a 120V relay, (120V input and output), would this work?

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Itchy Dog Brewery.

(As of 10-24-2011)
Primary - Steppe 112 PA, 2x Monday RyePA
Aging - None :-(
On tap - Big Dog, Apfelwein, Steppe 112 PA

My invisible AG sculpture, with no actual sculpture and a tiny footprint.
My Kegerator goes offroading!
My Coors Home Draft dispenser for boating/beering on the go.

 
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Old 06-17-2011, 03:32 PM   #4
Misplaced_Canuck
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Yes, put the relay-return feed after the momentary switch. That makes sense to me.

M_C
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Old 06-17-2011, 10:57 PM   #5
P-J
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Quote:
Originally Posted by shortyjacobs View Post
Oh brilliant, never thought of having the relay feed off itself.

So, with a 120V relay, (120V input and output), would this work?
Excellent. Good job.

 
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