Re: Opto 22 Lags

The triac is bi-directional so reversing
the leads will not change anything.

Can you determine if the voltage at the
control is AC or DC? If it is DC, then
you should get an Opto 22 designed to
switch DC or use an electromechanical
relay.

Regards,
Steve Stallings
www.pmdx.com

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "bertmantx" <bertmantx@y...>
wrote:

>
> Would it help to reverse connections?? or does a triac work similar
> to a bridge rectifier?
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Steve Stallings"
> <stevesng@n...> wrote:
> >
> > Opto 22 relays come in different flavors for AC, DC
> > and different voltages. Is it possible that the
> > voltage at the control jack of your plasma cutter
> > is low voltage DC and you are trying to control it
> > with an AC Opto 22 module? The AC modules have a
> > Triac in them that will stay on forever as long
> > as the load current is sufficient to sustain them.
> > With a low current DC load they may eventually drift
> > to the off condition.
> >
> > Regards,
> > Steve Stallings
> > www.pmdx.com
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "bertmantx"
> <bertmantx@y...>
> > wrote:
> > >
> > > Can anyone tell me why my opto 22 relays are so slow to turn

off??

> > > torch continues to arc 2-5secs. after signal quits.
> > > I'm hooking port pin 9 to "+" and gnd pin 18 to "-" and torch

to

> > > contact symbol.