Re: [CAD_CAM_EDM_DRO] Re: PMDX-122 with which THC

I'm not an electric guy at all. I'm a mechanic engineer. By telling
PMDX-122 is not optically isolated, I guess that's why I have some
mysterious errors, like e-stop gets on with no reason. Some times the
stepper don't go where they are supposed to go according to the
programming. Am I right?

Thanks for your responses

Rick



2011/11/21 morerust <stevesng@...>

> **
>
>
>
>
> Tom's comments regarding the number of inputs
> is correct. The PMDX-122 offers 4 user assignable
> inputs. After using 3 for the THC, only one is
> left for any other purpose, including limit
> switches. This can work as long as you do not
> mind ganging all the limit switches on one
> input.
>
> Tom credits the PMDX-122 with having optically
> isolated inputs, which it DOES NOT have. For
> this reason we usually recommend that it not
> be used in plasma systems. Sure, we have some
> customers who do it, but they either have a
> good design that avoids noise problems, or
> have just plain been lucky.
>
> We normally recommend the PMDX-126, which does
> have optical isolation, when customers want to
> use the CandCNC LCTHC or any of the Sound Logic
> designed THC units.
>
> Regards,
> Steve Stallings
> www.PMDX.com
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Tom" <thom@...> wrote:
>
> >
> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "bob campbell" <bob@> wrote:
> > >
> > > Rick,
> > >
> > > I will have Randy Ray contact you. Randy has what you need. Randy took
> over
> > > the THC business from Jim Cullins. Randy also has some new offerings.
> > >
> > > Bob Campbell
> > >
> > And, what Randy will tell him is, he needs 3 dedicated inputs for MACH.
> > Been the same since day one (THC300 days)! Gotta have: UP, DOWN and Arc
> OK. Most single port BoB cards have 5 inputs. One is for e-stop and 4 are
> for all other inputs. If you want homes and limits then there is not enough
> for the three more for the THC.
> >
> > The PMDX 122 card has opto isolated inputs (the standard 5).
> >
> > The PMDX 126 card has 8 opto isolated inputs (muxed) The ONLY other BoB
> that has more than 5 inputs (9) from a single parallel port, is our UBOB
> III card (that is also in the MP3000-DTHCII.
> >
> > The customer wants a way to use his PMDX 122 card but the fact remains
> that he STILL NEEDS 3 inputs dedicated to the THC functions in MACH.
> >
> > Tom caudle
> > www.Candcnc.com
> >
>
>
>

--
Ricardo Bocaz Bocaz
+56998627863
Chill�n, Chile


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