Re: [CAD_CAM_EDM_DRO] Limit Switches for Gecko 320

I strongly recommend a separate limit/estop as you mention..

I have a circuit on my site that uses normally closed limits in series. If
any one opens
all servos are disconnected and routed through 10 ohm braking resistors.
This
will also happen with sustained (>.25s) mains failure as it is wired as a
magnetic switch.
I must caution that this method may not be safe for Gecko amps due to
suddenly
breaking the servo connection. The resultant Ldi/dt spike is clamped by a
95-105v
tranzorb in the circuit ; the method was "blessed" by my amp maker Copley.
It will work with a non-functional computer, servo amp, or even power
overvoltage.

Jon Elson has another circuit on his site. It has some more sophisticated
logic than
mine and I think brakes servos back through the amps. It may require
functional
amps but does not suddenly physically disconnect servos so it might be
easier
on the amps with voltage spikes. It's better he describe it.

Mariss from Gecko has an e-stop circuit (I think) in the files section of
this group.

Les
Leslie Watts
L M Watts Furniture
Tiger, Georgia USA
http://www.rabun.net/~leswatts/wattsfurniturewp.html
engineering page:
http://www.rabun.net/~leswatts/shop.html

----- Original Message -----
From: "Deon Styger" <deons@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, June 20, 2002 6:22 AM
Subject: [CAD_CAM_EDM_DRO] Limit Switches for Gecko 320


> Hi all,
>
> Using EMC with Gecko 320 drives and servos, what would you recommend for
the
> limit switch setup? I remember some previous post mentioning that a Gecko
> 320 can fail in a mode which will cause it to run away regardless of
> controller input. This will render the normal EMC-xyz limit feedback
useless
> and therefore calls for an e-stop type of limit switch setup. Any thoughts
> on this? What would be the best way to achieve such a setup?
>
> My apologies for digging this up again, but trying to search the archives
is
> driving me nuts with frustation.
>
> Regards,
> Deon Styger.
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.368 / Virus Database: 204 - Release Date: 29/05/2002
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this as a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
>
>
> Post messages: CAD_CAM_EDM_DRO@yahoogroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
> Moderator: jmelson@... timg@... [Moderator]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> bill,
> List Mom
> List Owner
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>