Re: e-stop sceme

I have a circuit diagram posted at
http://photos.groups.yahoo.com/group/master5/lst?.dir=/Washcomps+CNC+
Bridgeport&.src=gr&.order=&.view=t&.done=http%
3a//photos.groups.yahoo.com/group/master5/lst%3f%26.dir=/%26.src=gr%
26.view=t

on the Master5 group (photos under washcomp). I'm trying to
remember if I changed the N.O. switch and associated contact in the
limit switch circuit at the upper right, but can let you know for
sure on Monday if your interested. This circuit is currently
working, but I welcome feedback.

The stepper drives (API CMD's) are very similar to Gecko 210's

The breakout board (Axxis) is similar to Campbell in concept (it
outputs 12 volts for relay coils on some output ports which his
may/may not do, but has a couple of quircks which his dosn't)

The power supply is a home-brew at 65 volts D.C. (can boost to 72
volts with taps)

Some of the circuit refers to a pneumatic brake/lock on the spindle
which seems to be unique to this machine and can probably be ignored.

The use of the "start" button provides a safety so the "charge pump"
circuit (and associated parallel port output pin) are no longer
needed. It also provides a failsafe that forces a button to be
pushed before the mill will move.

Please let me know if this is helpful (or have any suggestions)

Regards,
Jeff

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "zbushz" <mbush@l...> wrote:
> Sound good to me Tony, Do you have any idea what sort of relay you
> would need to control 70v dc 20 amp.
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Antonius J.M. Groothuizen"
> <agroot@s...> wrote:
> > Mike,
> >
> > I'm thinking along the lines of:
> > - separate 12V power supply for EPO / E-Stop
> > - series connected EPO switch chain (one on PS / driver box)
> > - primary power of main TX removed by de-energized relay
> > - capacitors on secondary discharged by Mariss' circuit (in
files)
> > - drives disabled
> > - control lines (step / dir) disabled
> > - EPO signal (active low) available for processor
> >
> > Let's both come up with a design, and let this forum rip 'em
apart
> > as we both will have different ideas. We can then merge our
efforts
> > into a single project for the files section. I'm using the G201
> > drivers, so much the better if you are using a different set as
we'll
> > have two examples.
> >
> > What do you think?
> >
> > Tony
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "zbushz" <mbush@l...>
wrote:
> > > OK. I have Geckos and Bob Campbells breakout board.I have a
seperate
> > > 50v power suppy. Now I am starting to put the whole thing
together.
> > > The first steps are powering everything up. I think the second
step
> > > should be arrainging for e-stop. I would like a normaly closed
red
> > > mushroom, that when opened will remove power to everything. If
I put
> > > relays on the power to the board and the incomeing dc power,
would
> > > that be enough. Is it good pratice to power down this way. Do
I need
> > > to be concerned with voltage generated by the motors coming to
a
> > stop.
> > > I would expect to use this button rutinely to put the machine
in a
> > > safe state for tool and part changes. Any advice will be
appreciated
> > > take care
> > > Mike Bush