From: Marc Postman (postman@stsci.edu)
Date: Tue Jun 20 2006 - 08:29:32 PDT
We will keep you posted. This may be serious but not necessarily
fatal. There is a redundant power supply on ACS that can be activated.
Begin forwarded message:
> From: Helmut Jenkner <jenkner@stsci.edu>
> Date: June 20, 2006 8:55:44 AM EDT
> To: st_all@stsci.edu, Rudolf Albrecht <ralbrech@eso.org>, Robert
> Fosbury <rfosbury@eso.org>
> Cc: Helmut Jenkner <jenkner@stsci.edu>
> Subject: ACS Suspended
>
> On Monday, 19 June 2006, at 1:15 pm EDT (17:15 UT), the Advanced
> Camera for Surveys (ACS) issued status buffer messages indicating
> that the +15V and +5V power supply voltages in the CCD Electronics
> Box (CEB) were above their high limits, causing the ACS to suspend.
> This event occurred in a period with no ACS commanding and outside
> the SAA. A dump of the relevant data showed that a total of 36 CEB
> items exceeded limits at the time of the event.
>
> At this point, the ACS is in a safe configuration, and further
> analysis is on-going. The Institute has been asked to check the
> last ACS images before the event for any anomalies, and to prepare
> a summary of planned ACS observations for the coming weeks, as well
> as to plan a contingency observing schedule without ACS for the
> near future.
>
> We will provide updates on the ACS situation as soon as information
> becomes available.
>
> Helmut
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