Star-tpc-l mailing list

["Van Buren, Gene" <gene AT bnl.gov>]

Looks like there was some discussion on the ops list just a bit ago too. I'm 
forwarding here (TPC list) for the record.

Thanks,
-Gene


Begin forwarded message:

> From: David Tlustý <tlusty AT gmail.com>
> Subject: Re: [[Star-ops-l] ] Wiener/Iseg HV PS for Grid Leak Wall
> Date: September 24, 2024 at 2:21:17 PM EDT
> To: James H Thomas <jhthomas AT berkeley.edu>
> Cc: "Lebedev, Alexei" <alebedev AT bnl.gov>, STAR experiment operations 
> mailing list <star-ops-l AT lists.bnl.gov>, videbaek <videbaek AT bnl.gov>
> Reply-To: star-ops-l AT lists.bnl.gov
> 
> Hi Jim,
> 
> That’s very useful. I tried that Emergency Off and then clearEvents command 
> and it seems
> it fixed the problem. Shift crews are starting the new run (25268040) with 
> the Grid Leak
> having all channels at reference values. 
> 
> David  
> 
>> On Sep 24, 2024, at 19:12:18, James H Thomas <jhthomas AT berkeley.edu> wrote:
>> 
>> Dear David,
>> 
>> I believe that we are using a Wiener/ISEG HV supply to provide 150 and 450 
>> volts to the Grid Leak Wall.  As I recall, these supplies have several 
>> reset options.   Do you think it would be possible to try some of the 
>> other resets on the bad channels using CDEV commands?
>> 
>> To be precise, the ISEG manual from 2013 is enclosed.  Pages 26, 27, 28 
>> describe some special commands for these modules.  In particular, the ISEG 
>> modules seem to have more than On, Off, and tripped modes.  They also have 
>> Emergency On and Emergency OFF, and ClearEvents.   As I recall from prior 
>> use of these modules on the SSD, they would trip and sometimes fall into 
>> the Emergency Off mode and so would not respond to the normal clear trips 
>> command.  I think (but don't really remember accurately) that toggling 
>> ClearEvents and resetEmergency OFF a few times for the bad channels was 
>> required.
>> 
>> If you can see clearly through the fog of these words, do you think it 
>> would be worth a quick try to clear these channels before a more invasive 
>> access this afternoon?
>> 
>> Cheers,
>> Jim
>> 
>