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3 pos switch, 2 relays = 3 way control


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oakchas 
Member - Posts: 7
Member spacespace
Joined: September 02, 2006
Posted: September 10, 2006 at 8:08 PM / IP Logged  

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. 

xscash 
Copper - Posts: 317
Copper spacespace
Joined: March 05, 2006
Location: United States
Posted: September 10, 2006 at 8:13 PM / IP Logged  
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
oakchas 
Member - Posts: 7
Member spacespace
Joined: September 02, 2006
Posted: September 10, 2006 at 8:34 PM / IP Logged  

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...) 

3 pos switch, 2 relays = 3 way control - Last Post -- posted image.

xscash 
Copper - Posts: 317
Copper spacespace
Joined: March 05, 2006
Location: United States
Posted: September 11, 2006 at 4:16 PM / IP Logged  
do you need high-amp draw or could you just use diodes?  no relays
expandable sound
south of boston
oakchas 
Member - Posts: 7
Member spacespace
Joined: September 02, 2006
Posted: September 11, 2006 at 9:07 PM / IP Logged  

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.

oakchas 
Member - Posts: 7
Member spacespace
Joined: September 02, 2006
Posted: September 11, 2006 at 10:33 PM / IP Logged  

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?

3 pos switch, 2 relays = 3 way control - Last Post -- posted image.

ff-mike 
Copper - Posts: 199
Copper spacespace
Joined: November 15, 2004
Location: United States
Posted: September 12, 2006 at 12:35 PM / IP Logged  
Why is this so overcomplicated????
3 pos switch, 2 relays = 3 way control - Last Post -- posted image.
oakchas 
Member - Posts: 7
Member spacespace
Joined: September 02, 2006
Posted: September 12, 2006 at 5:14 PM / IP Logged  

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

ff-mike 
Copper - Posts: 199
Copper spacespace
Joined: November 15, 2004
Location: United States
Posted: September 13, 2006 at 8:35 AM / IP Logged  
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
hotwaterwizard 
Silver - Posts: 1,350
Silver spacespace
Joined: December 11, 2003
Location: California, United States
Posted: September 13, 2006 at 8:36 AM / IP Logged  

3 pos switch, 2 relays = 3 way control - Last Post -- posted image.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 !

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