[TriEmbed] Circuit Help

Scott Hall scottghall1 at gmail.com
Fri Dec 4 17:44:25 CST 2015


You need to use an old trick with a DPDT switch:

+ in --------------------\
                         |
                  +------|------+
                  |  A   B   C------------- out +/-
                  |    --  --   |
                  |  D   E   F------------- out -/+
                  +------|------+
                         |          A---F  terminals
- in --------------------/          D---C  cross connected

It is a cross-over circuit.  When the relay is thrown right, C is +, and F
is -
When the relay is thrown left, C is -, and F is +

- sgh


On Fri, Dec 4, 2015 at 12:51 PM, Grawburg via TriEmbed <
triembed at triembed.org> wrote:

> I have a quarter-turn ball valve with a 12V actuator [HSH-Flo 1/2" DN15
> 12VDC CR-05 FNPT SS304 Position Feedback Motorized Electric Ball Valve.]
> I'm using opto-isolated relay activated by a Raspberry Pi but can only
> control one direction because the valve reverses direction by flipping the
> leads. If I was doing it mechanically I would have a double pole triple
> throw rotary switch. I cannot find a suitable opto-isolated relay that is
> 2P3T...at least one that doesn't cost a fortune. Any suggestions to help me
> think this through would be welcomed.
>
>
> Thanks,
> Brian Grawburg
>
>
>
>
>
> _______________________________________________
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> TriEmbed at triembed.org
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> TriEmbed web site: http://TriEmbed.org
>



-- 
Scott G. Hall
Raleigh, NC, USA
scottghall1 at gmail.com
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