Experimental Physics and
Industrial Control System

Korhonen Timo <[email protected]> · Thu, 10 Jan 2008 08:56:58 +0100

Hi,
we have had similar incidents with the MAXv's predecessor, the OMS58
card. In that case the reason was bad design

of that card: a capacitor is placed too close to the card border and its
5v-side pin touches the ESD (electrostatic discharge)

strip on a VME64x crate (OMS58 is of course not designed for VME64x, but
even in the old standard this

placement was not acceptable). The card then pulled a lot of current
from the backplane, eventually burning the pins,

the (P1) connector and the backplane slot.
best regards,
Timo
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

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--

Timo Korhonen PSI (Paul Scherrer Institut, http://www.psi.ch)
CH-5232 Villigen PSI
tel + 41- 56 3103262 fax + 41 - 56 310 3383
e-mail: [email protected]

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System