Experimental Physics and
Industrial Control System

"Ronald L. Sluiter" <[email protected]> · Mon, 13 Nov 2006 14:15:02 -0600

The OMS VME58 is susceptible to noise on the limit switch lines.
This has been the most frequent problem that I have been called on
the diagnose.
Kurt Goetze and I did some testing to see if this is a problem with the
MAXv.  Of course we can't quantify it, but it appears that OMS has
done a much better job with the MAXv on this issue.
Ron
Emmanuel Mayssat wrote:
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.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System