Re: [CAD_CAM_EDM_DRO] SS Relays - Revisited

It sounds like the torch controler checks the triger on tern on see,s a load
and is going into error mode when you disconect from the triger and tern it
on it does not see the load and checks ok then when you hook it back up it
trigers the torch. to solve this I need to know what is the output off
resistance of the controler and then on resistance. I allso need to know
what the triger voltages on the triger input are for the torch if you have
them.

Mark

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, December 13, 2003 12:42 AM
Subject: Re: [CAD_CAM_EDM_DRO] SS Relays - Revisited


>
>
> cutthroatplasmaco wrote:
>
> >Jon, someone, anyone please shed some more light...
> >
> >I ordered one of these
> >http://www.crydom.com/pdf/dc60.pdf
> >I hook it up, power up the input.
> >I'm no electrical engineer, so I don't know the proper
> >terms/techniques or anything here, but I set my voltmeter to ohms and
> >touch the output poles and it shows a reading... i shut the input
> >off, take another reading and nothing. So, from my limited knowledge,
> >everything looks good. I then hookup the output sides to my plasma
> >trigger (that's what I am using it for, to fire my plasma cutter) I
> >turn on my plasma cutter, and it shows a fault... so I'm
> >thinking 'ok, I did something really dumb here and cooked my plasma
> >cutter'. I then proceed to disconnect one side of the relay... the
> >relay input is powered off this whole time, I turn the plasma cutter
> >back on, and of course the fault is gone. The relay input is still
> >off, so I reconnect the output and 'IT FIRES THE TORCH!!! (and scares
> >the bajeezers outa me)'.
> >
> >So, my question is why would a closed (off) relay act as though it
> >were on? The torch trigger shows about 18VDC. I have the positive
> >18VDC connected to the + side of the relay output and the relay input
> >is turned off. The only thing I didn't check is what the amperage is
> >on that 18VDC on the torch trigger. Could that possibly have anything
> >to do with it, if the amperage on that 18VDC were higher than the
> >rated load current range of the relay?
> >
> >
> I really can't answer this. Are you sure you have the polarity of the
> SSR correct with respect to the polarity of the torch control?
> The SSR may well have a diode to protect the SSR against reverse
> polarity on the output terminals. That would be my best guess.
>
> Jon
>
>
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