RE: Motion control failure at APS

[Emmanuel Mayssat <emmanuel_mayssat@lynceantech.com>]

I actually had the exact opposite problem.
My motor controller would barely start a move.
The limit switches were reported as not closed, and the apparatus was in
a safe position to operate. The problem was due to glitches on the limit
switch cables (we actually never observed those glitches). The problem
was reproducible in a controlled environment (engineering bench). 
As of today, we think it was due to cable length and cross talking.
We rebuild and shortened the cables. It immediately worked.

Food for thoughts and... time for lunch,

--
Emmanuel

On Mon, 2006-11-13 at 12:56 -0600, Mark Rivers wrote:
> Folks,
> 
> We have seen failures in the past where a motor moved constantly at a
> slow rate right past limit switches on an OMS58.  It happened only on a
> single axis, not on all 8 axes.