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<== Date ==> <== Thread ==>

Subject: RE: CLS OMS 58 Failure Report
From: "Elder Matias" <Elder.Matias@lightsource.ca>
To: "Matthieu Bec" <mbec@gemini.edu>
Cc: tech-talk@aps.anl.gov
Date: Wed, 21 Oct 2009 09:29:55 -0600
Matthieu,

The problem we encountered is both intermittent and systematic.  After
power cycling the crate and leaving it alone for a  period of time it
would start to exhibit this behavior.  Within a few hours of power
cycling the crate the problem would show up.

Elder


-----Original Message-----
From: Matthieu Bec [mailto:mbec@gemini.edu] 
Sent: Wednesday, October 21, 2009 8:03 AM
To: Elder Matias
Cc: tech-talk@aps.anl.gov
Subject: Re: CLS OMS 58 Failure Report

Hi Elder,

Can you tell if the failure was intermittent or systematic on the broken

card?
This is worrying for my project because we use the OMS58 in several 
places and as much as we intend it, it's not always possible to put 
(mechanical) hard limits to protect our equipment.

Thanks
Matthieu

On 10/21/09 10:45, Elder Matias wrote:
> I should have sent this failure report out some time ago in case it is
> helpful at one of the other labs.
>
> This summer we had an OMS58 board fail.  The result of the failure was
a
> less than desirable outcome for one of our Kohzu monocromator.
>
> The nature of the failure is that on several channels this OMS58 board
> started sending pulses out to the motors, in complete disregard to any
> limit switches and without being commanded by the software.  Without
any
> hard stops or secondary limit switches that interlock the drive power
> the motors continued moving beyond their normal range of travel and
did
> a bit of damage to the internals of the mono.  In this application we
> were relying on the firmware (on the board) to stop the motion when
the
> limit switches were hit.
>
> We removed the board from the beamline, brought it back to our
controls
> test lab, were able to reproduce the failure in a different setup.
The
> board was shipped back to the supplier, they localized the failure to
a
> data buffer IC (74245) that is located in U82 on OMS58.
>
> Elder
>


-- 
Matthieu Bec              Gemini Observatory
Tel: +56 51 205785        c/o AURA, Casilla 603
Fax: +56 51 205650        La Serena, Chile


References:
CLS OMS 58 Failure Report Elder Matias
Re: CLS OMS 58 Failure Report Matthieu Bec

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