Re: [CAD_CAM_EDM_DRO] Re: err/res circuit(updated picture)

I am designing one using a PIC to do the logic.
It will monitor 4 drives and use an led to blink 1 for the first 2 for the
second an so on
led off = OK.
It will interface with the Sound Logic board charge pump and Estop relay
It has optically isolated in and out
power to it is isolated as well.
just starting to prototype it.
Jim Cullins

----- Original Message -----
From: "cnchomeman" <cnchomeman@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, July 16, 2003 7:23 PM
Subject: [CAD_CAM_EDM_DRO] Re: err/res circuit(updated picture)


> Thanks for the input. I agree the 3 err/res pins can be tied
> together, but if done that way I will not be able to see which axis
> is faulted. If done seperatly, I can tell which is giving me
> trouble. I can also place another LED on the outside of the control
> box (not shown on diagram).
>
> As far as I know ny brand new gecko's won't reset on thier own unless
> the err/res goes high for 5 seconds. (correct me if I am wrong
> someone)
>
> For opening the DC side of the circuit, I considered that but that
> would leave the caps charged so I would then need to deal with that.
> I guess a resistor and an esr contact across the cap would work.
>
> Sure, send me the drawing.
>
> Eric
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "caudlet" <info@t...> wrote:
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "cnchomeman"
> > <cnchomeman@y...> wrote:
> > >
> > >
> > > here is the new picture of what I want to do.
> > >
> > > http://www.e-zflight.com/files/ncnczi.jpg
> > >
> > > Eric
> > >
> > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "cnchomeman"
> > > <cnchomeman@y...> wrote:
> > > > Have a look at this circuit for the err/res of 3 drives.
> Ignore
> > > the
> > > > 3 contacts from the fault relays in the estop rung. I will
> move
> > > > those and a contact from the esr to a new rung with another
> > > > relay/contact going to the computer input. As drawn, a fault
> > would
> > > > shut down all power to the drives. Other than that, does it
> look
> > > ok?
> >
> >
> > A preliminary look confirms it will probably do what you want. Me
> > thinks there must be an easier way to do it though with fewer
> parts.
> > Seems that I remember the err/res is a high impedence input and you
> > can tie all three of the axis's together and build one control that
> > does the same as the three relays.
> >
> > Lets think about this: If you tied the three err/res pins together
> > (provided all three axis DC feeds share the same ground) then if
> any
> > one of them went into fault it would shut down the other two. A
> PNP
> > Transistor driving a fault relay powered from the Gecko +5 (make
> sure
> > you use a flyback diode across the relay coil with cathode to the +
> > side of the coil) then the NO relay switch contacts could be used
> to
> > trigger e-stop. I believe that the newer 320/340's will auto reset
> > if the fault condition is cleared but if not, you could use a
> > separate relay or an opto (NPN type) with the collector tied to +5
> > and the Emitter to the err/res common connections. Activating the
> > opto would put a logic high on the err/res pins and reset all three
> > Gecko's Your 6 second timer could be an NPN transistor that is
> > controlled by a 6 second one-shot (555 timer?).
> >
> > To review. All three Gecko err/res pins tied together. A PNP with
> > the base tied to the common junction the collector to ground and
> the
> > emitter to either a relay coil or the cathode of the input of an
> Opto
> > isolator to provide a signal back to the PC for e-stop.
> >
> > For reset, a 6 second "one-shot" circuit driving either another
> relay
> > or the input of an opto and the relay contacts or opto NPN
> providing
> > the +5 from the Gecko to the common junction to reset all three.
> >
> > Anybody see anything wrong with this idea? Mariss?
> >
> > For the e-stop side of things you need to consider cutting the DC
> > power to the motors (Gecko's) by opening the DC side of the circuit
> > AFTER the filter cap. While turning off the AC will eventually
> shut
> > things down the filter cap will continue to supply DC power for a
> > couple of (maybe critical) seconds. I have a large contactor
> (4pole)
> > that uses one set of its own contacts to "latch" itself on. I have
> > the table limit switches wired in a normally closed configuration
> > going to the coil of a 12VDC relay. The contacts of this relay are
> > in series with the large contactor coil (as is the STOP) button on
> > the front panel and the PANIC button on the machine. All of these
> > use the Normally Closed contacts so a switch activation removes
> power
> > from the contactor coil. Anything that breaks the circuit to either
> > the 12VDC relay coil OR the contactor Coil shuts off DC power
> > immediately.
> >
> > I have a schematic tha I will be glad to send you.
> >
> > Tom
>
>
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