[Dsg-hallb_magnets] request to stop Torus LV cRIO for debugging on morning of 2016-01-04

[Tyler Lemon]

Hello Dave, 

All Load Cells were reading improperly after the last attempted update. Attached are EPICS Archive plots from November 11, 2016 showing the Load Cell values jumping to over 2x10^6 lbs. 

The LV cRIO also reads Cernox sensor and PT100 data. Looking at the EPICS Archive plots for the same time as the attached plots, all other sensors in the LV Chassis were not affected. However, there is a chance that the signals from the other sensors may be briefly interrupted while debugging code is deployed to the cRIO. Would you know what temperature sensors are used for the cryogenic flow control loops? 

Best regards, 
Tyler 


From: "Dave Kashy" <kashy at jlab.org> 
To: "Tyler Lemon" <tlemon at jlab.org> 
Cc: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org>, "Denny Insley" <dinsley at jlab.org> 
Sent: Wednesday, January 4, 2017 8:00:12 AM 
Subject: Re: request to stop Torus LV cRIO for debugging on morning of 2016-01-04 

Hi Tyler, 
Which load cells are reading improperly? 
I looked through them this moring and time histories over the last 5 weeks and see nothing wrong. 
I don't have a problem with you taking down the system as long as the cryogenic flows are not impacted. 
None of the control loops use any force or strain readings. 

Dave 



----- Original Message ----- 
From: "Tyler Lemon" <tlemon at jlab.org> 
To: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org>, "kashy" <kashy at jlab.org> 
Sent: Tuesday, January 3, 2017 4:39:02 PM 
Subject: request to stop Torus LV cRIO for debugging on morning of 2016-01-04 

Hello Dave Kashy, 

Can the Torus LV cRIO be taken offline tomorrow morning for a few hours to debug bad Load Cell readings? 

The debugging would be to find the cause of the bad Load Cell Values that occurred after Brian Eng made changes to the LV cRIO in November 2016 (HBTORUS Logbook entry #3438123). 

Today, at about 2:00PM, Ruben gave his okay and requested you to also approve the cRIO downtime. Please let me know if there are any tests occurring tomorrow morning where the Torus LV cRIO should not be stopped. 

Best regards, 
Tyler 


From: "Ruben Fair" <rfair at jlab.org> 
To: "Tyler Lemon" <tlemon at jlab.org> 
Cc: "David Kashy" <kashy at jlab.org> 
Sent: Tuesday, January 3, 2017 1:49:57 PM 
Subject: Re: [Dsg-hallb_magnets] request to stop Torus LV cRIO for debugging 

Hi Tyler, 

Yes - most probably but please check with Dave Kashy first. 

Ruben 


From: "Tyler Lemon" <tlemon at jlab.org> 
To: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org> 
Sent: Tuesday, January 3, 2017 1:48:14 PM 
Subject: [Dsg-hallb_magnets] request to stop Torus LV cRIO for debugging 

Hello Ruben, 

In November, Brian made changes to the Torus LV cRIO that had to be rolled back because of issues with nonsense Load Cell readings. These issues were noted in HBTORUS Logbook entry # 3438123. 

Can the Torus LV cRIO be taken offline this afternoon for a few hours to debug the bad Load Cell readings? 

Best regards, 
Tyler 


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