Re: [CAD_CAM_EDM_DRO] Proportional Controller ?

Thanks Guys !

Gee I paid a buck a piece and their brand new !

I thought that was how the thing was supposed to work.

Now, What to do with them..............Hmmm

Chris

Jon Elson wrote:

> datac@... wrote:
>
> > Maybe someone can Identify what I have.
> >
> > I picked up (2) devices that look exactly like a solid state relay.
> > But the are not, they say "proportional controller" on them.
> >
> > Made by Douglas Randall, model # R25A
> > On one side, terminals 1 and 2 say AC Load - 25 amp
> > The other side, terminals 3 and 4 say Resistance.
> >
> > I did a search that turned up little. I have some assumptions to what
> > they do but maybe someone who actually knows could explain it and give
> > an illustration on a typical application.
> >
> > I'd rather that than connect it up and do a little experimenting.
>
> What this does is control the power output by regulating the phase
> angle of triggering Triacs or SCRs. Assuming there are no other
> terminals, you hook a light bulb in series with the AC load terminals
> and the power line. Now, if you hook a variable resistor between the
> 2 'Resistance' terminals, the light bulb should vary from off to full on.
> A pretty neat device, and probably pretty expensive, maybe over $200.
>
> Jon
>
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