Experimental Physics and
Industrial Control System

Tim Mooney <[email protected]> · Wed, 09 Jan 2008 17:09:45 -0600

The most plausible cause I can think of is a short in or across the
motor connector that put motor-drive voltage (~48V in our case) on a
limit-switch line, perhaps only momentarily. I don't know about the
MAXv, but the VME58 has limit-switch lines going straight to a PAL,
which would certainly get crispy under this kind of assault.
We had an OMS VME58 (I think) burn up several years ago (eight,
maybe?). I think Kurt

Goetze has the best handle on what happened, and he's out for a couple
of weeks. I talked to

one of the staff at the beamline where the incident occurred, but I
didn't get a sense that they knew exactly what led up to the incident.
Gillingham, IJ (Ian) wrote:

On the night of 30th December 2007, a fire broke out in one of our
control system's VME crates. Considerable damage was inflicted on the
crate, but fortunately the fire did not spread. On examination of the
crate and VME cards, the P1 connector, to which a "MAXv 8000" card was
connected, had been destroyed by heat/flame. Electrical burning of
some components was evident on the MAXv card, these components were
well away from the direct heat of the main area of combustion
(components close to the fire were of course destroyed).
We are presently trying to ascertain which component caused the
failure (the MAXv card, P1 connector or VME backplane).
Has anyone else experienced this type of event, in particular with the
MAXv motor control card?

Ian Gillingham
Diamond Light Source

This e-mail and any attachments may contain confidential, copyright
and or privileged material, and are for the use of the intended
addressee only. If you are not the intended addressee or an authorised
recipient of the addressee please notify us of receipt by returning
the e-mail and do not use, copy, retain, distribute or disclose the
information in or attached to the e-mail.

Any opinions expressed within this e-mail are those of the individual
and not necessarily of Diamond Light Source Ltd.

Diamond Light Source Ltd. cannot guarantee that this e-mail or any
attachments are free from viruses and we cannot accept liability for
any damage which you may sustain as a result of software viruses which
may be transmitted in or with the message.

Diamond Light Source Limited (company no. 4375679). Registered in
England and Wales with its registered office at Diamond House, Harwell
Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United
Kingdom

--
Tim Mooney ([email protected]) (630)252-5417
Beamline Controls & Data Acquisition Group (www.aps.anl.gov/aod/bcda)
Advanced Photon Source, Argonne National Lab

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System