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

Rick,

Most breakout boards are not optically isolated on the step and direction
lines. Most were designed to work with the Gecko drives. The reason for this
is that most of the Gecko drives have a built in optical isolator. Having
two optical isolators in series can cause timing problems.

Most breakout boards do have optical isolators on the other lines.

Bob Campbell

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Ricardo Bocaz Bocaz
Sent: Monday, November 21, 2011 8:39 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: 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
Chillán, Chile


[Non-text portions of this message have been removed]



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