Help with Design?

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=48547
Printed Date: May 12, 2025 at 4:58 PM

Topic: Help with Design?

Posted By: wad2k
Subject: Help with Design?
Date Posted: January 25, 2005 at 9:05 AM

Hope someone can help:
I have three lamps(13w compact flourescent. Each driven by its own 12vdc electronic ballast) that I would like to switch on/off(*select only one to be on at a time) using 3 momentary switches(preferably spdt but I can use dpdt). Currenty I am using three SPDT "alternate action(non momentary)" switches with three non-latching relays. Doing it this way, all three lights can be on at the same time if all the switches are pushed in. I dont want it to work that way. I simply want to build a selector with three MOMENTARY switches....ie:

lamps A,B,C
And Switches A,B,C

When pushbutton"A" is pressed, lamp "A" goes on and lamps "B" and "C" should be off.

When pushbutton"B" is pressed, lamp "B" goes on and lamps "A" and "C" should be off.

When pushbutton"C" is pressed, lamp "C" goes on and lamps "A" and "B" should be off.

NOTE: The above "switching sequence" is not in any order...For example I may want to turn on Lamp "B" first..

Simple concept??? It is just a simple lamp selector using momentary switches

I thought about using 2 latching relays but I can't figure out how to make it work??

It would seem that using relays would be the best and most reliable way to do this but I am totally open to ANY designs!

I am also hoping to keep the cost under $150 and of course I really want it to last!
Any sugestions???

Thanks in advance!

PS Im glad I found this website...Alot of great info!

Replies:

Posted By: wad2k
Date Posted: January 26, 2005 at 10:25 AM

ANyone have experience with impulse or stepping relays? If so, would they do what I need done?

Posted By: hotwaterwizard
Date Posted: January 26, 2005 at 11:50 PM

How about a Rotary Switch. posted_image

It has a Knob that you just turn to which one you want.

Or do you have to have push buttons and Relays.

You could just get a push selector switch where all 3 switches are interconnected together. posted_image

Rotery Switches

https://www.meci.com/Catalog/Item/b9363abe-125a-48cf-ba47-b9012d051565
https://www.meci.com/Catalog/Item/d0866f66-e26e-496f-8760-38935665d741

Interlock Switches

https://www.meci.com/Catalog/Item/30ac7f96-bf9b-4a14-a608-c52be65debd3

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: wad2k
Date Posted: January 27, 2005 at 9:23 AM

Thanks for the info but, unfortunatley I have to use Pushbuttons... The control panel and circuit board I am using already has 3 NKK pushbuttons that are alternate action(push on/push off) and they are controlling 3 power relays( non-latching) right now...NKK offers the exact same style switch in a Momentary version....which is really what I want to use....

Posted By: wad2k
Date Posted: January 27, 2005 at 9:23 AM

Posted By: hotwaterwizard
Date Posted: January 27, 2005 at 3:46 PM

So Are we using :

Momentary ON

Momentary OFF

Push ON Push OFF?

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: hotwaterwizard
Date Posted: January 29, 2005 at 8:13 PM

Let me see if I understand.

You want to control 3 lights and only one is allowed to be on at any given time. with 3 push on off switches

SPST

SPDT

DPDT

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: hotwaterwizard
Date Posted: January 29, 2005 at 8:35 PM

Is this the Circuit you have now? posted_image

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

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