Re: [CAD_CAM_EDM_DRO] Request for comment - G320 wiring part II

Alan,

Surely ESTOP in the form of a big red button only needs to be on the motor
power anyway. As its purely a safety measure, all you need it to do is to
stop the machine dead in its tracks - hopfully so that you can extract the
mangled remains of whatever bit of your anatomy you happen to have dangled
in it.

If you use a multi-pole relay, there is no reason why you shouldn't also
control the power to the controller through the ESTOP switch but, since if
the power is removed from the motors the controller won't be doing anything
anyway and it is pretty certain that you will have lost position and have to
start the job again, this would probably be an unnecessary complication.

Ian
--
Ian W. Wright
Sheffield UK
www.iw63.freeserve.co.uk

----- Original Message -----
From: "Alan Rothenbush" <beer@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: 15 August 2001 16:57
Subject: [CAD_CAM_EDM_DRO] Request for comment - G320 wiring part II


> Thanks to all who have responded to my request, and special thanks
> to Jerry Jankura for the extra time.
>
> After some consideration, I have revised my schematic slightly, adding
> the ESTOP output to the PC as well as "simplifying" the ESTOP circuitry.
>
> This simplification involves nothing more than rewiring the relays such
> that engaging the ESTOP switch removes power from the relays. The first
> version had the PIC reading the ESTOP switch and the PIC then removing
> power. This version should be more failsafe as a result.
>
> As pointed out by Jerry, this is not a be-all and end-all ESTOP solution.
> The total solution would require the lathehead/millhead motors and any
other
> motion causing device also be stopped when ESTOP is activated.
>
> That solution, though, is beyond the scope of what I wanted to produce.
> Such a controller would have to be somewhat customized to the machine in
> question - single phase Sherlines being pretty different in their
electrical
> requirements than gantry mills.
>
> Here again is the revised schematic.
>
> http://www.sfu.ca/~beer/G320.pdf
>
>
> Alan
>
>
>
>
>
>
>
>
> --
>
> Alan Rothenbush | The Spartans do not ask the number of the
> Academic Computing Services | enemy, only where they are.
> Simon Fraser University |
> Burnaby, B.C., Canada | Agix of Sparta
>
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