3 pos switch, 2 relays = 3 way control
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=82704
Printed Date: April 27, 2024 at 5:29 PM
Topic: 3 pos switch, 2 relays = 3 way control
Posted By: oakchas
Subject: 3 pos switch, 2 relays = 3 way control
Date Posted: September 10, 2006 at 8:08 PM
I'm trying to control three items with a 3 position switch; probably SPST, on/on/on; and 2 relays position 1= A,B,C on position 2 = A,C on, B off position 3= B on, A,C off I detail this in the post below... but want to NOT lose power to A or C when switching from position 1 to pos. 2. ( may require a "make before break" (shorting) switch... I have an unfinished schematic here: https://www.the12volt.com/installbay/forum_posts.asp?tid=82682&PN=1 And it's a work in progress. I haven't figured out how to do it after reading all the stuff on relays etc., here. Any help appreciated.
Replies:
Posted By: xscash
Date Posted: September 10, 2006 at 8:13 PM
ok, i read that thread before....but what are you asking? do you need a recomendation on a switch...or are you asking for the wiring. if its wiring i can help.....as for the switch, i havent seen this one.
-------------
expandable sound
south of boston
Posted By: oakchas
Date Posted: September 10, 2006 at 8:34 PM
no, I don't need recomendation on the switch... I'm trying to figure out how to wire it... Here's What I think might work... (just to show I'm trying, really...) 
Posted By: xscash
Date Posted: September 11, 2006 at 4:16 PM
do you need high-amp draw or could you just use diodes? no relays
-------------
expandable sound
south of boston
Posted By: oakchas
Date Posted: September 11, 2006 at 9:07 PM
B is the only one with "high amp draw," it's bright bulbs, like the second filament on tail/brake lights (don't know how many amps they draw). The other two are ~300-500 milliamps. Also, the on on on switch, I'm finding, is DP3T and the wiring has pos 1 and 2 ON on pole one (the outputs are connected) and pos 2&3 are connected on pole 2 (outputs are connected)... And so now, I'm looking to do it with an on/off/on switch using the relays. I'm working on this myself, too. Trying to come up with a way that when B is on in position 3, the power to it does not feed back to A &C... so I think everything has to go thru the relays. If you come up with a schematic... that works, fantastic! I'm trying different ways as well, don't expect everyone to do my work for me... but surely appreciate the help.
Posted By: oakchas
Date Posted: September 11, 2006 at 10:33 PM
This is what I've come up with, showing the proper schematic for the switch as well. The > in the switch is a detent that holds the off position. Positions 1 & 3 are not momentary, either. Does this look right? 
Posted By: ff-mike
Date Posted: September 12, 2006 at 12:35 PM
Why is this so overcomplicated????
Posted By: oakchas
Date Posted: September 12, 2006 at 5:14 PM
Thank you, It's ovecomplicated because I don't do it every day, am unaccustomed to relays, and am over 50 to boot. I appreciate your help... I just couldn't seem to get my head around it. (old dog, new tricks kinda thing) Thanks again, Charlie
Posted By: ff-mike
Date Posted: September 13, 2006 at 8:35 AM
What I did was create a truth table to match your rquirements, and found that A&C were always the same, and then I worked the schematic from there. Lots cheaper using an SPDT-CO switch than a DPDT-CO unit
Posted By: hotwaterwizard
Date Posted: September 13, 2006 at 8:36 AM
 I think this was done in another post
https://www.the12volt.com/installbay/forum_posts.asp?tid=81686&PN=1 ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
|