[Dsg-hallb_magnets] TR817F2 at 325K, LV cRIO restarted

[Tyler Lemon]

Hello, 

Amanda, Pablo, and I have swapped NI-9870 modules. The Torus LV cRIO is back up and running. 

Tyler 


From: "Renuka Rajput-Ghoshal" <renuka at jlab.org> 
To: "Tyler Lemon" <tlemon at jlab.org> 
Cc: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org>, "Ramakrishna Bachimanchi" <bachiman at jlab.org> 
Sent: Monday, February 20, 2017 9:36:37 AM 
Subject: Re: [Dsg-hallb_magnets] TR817F2 at 325K, LV cRIO restarted 

Hello Tyler, 
I might have this in spare cabinet. 
Please come to my office and then we can check. 
I might not be in my office till about 10:30. Please call me before coming. 

Thanks 
Renuka 


----- Original Message ----- 
From: "Tyler Lemon" <tlemon at jlab.org> 
To: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org>, "Ramakrishna Bachimanchi" <bachiman at jlab.org> 
Sent: Monday, February 20, 2017 9:31:42 AM 
Subject: Re: [Dsg-hallb_magnets] TR817F2 at 325K, LV cRIO restarted 

Where would the spare NI-9870 module be? It can be swapped this morning if we have one. 

Tyler 



From: "Probir Ghoshal" <ghoshal at jlab.org> 
To: "Ruben Fair" <rfair at jlab.org>, "Tyler Lemon" <tlemon at jlab.org> 
Cc: "Ramakrishna Bachimanchi" <bachiman at jlab.org>, "Renuka Rajput-Ghoshal" <renuka at jlab.org> 
Sent: Monday, February 20, 2017 8:54:07 AM 
Subject: Re: [Dsg-hallb_magnets] TR817F2 at 325K, LV cRIO restarted 

Ruben, Tyler, 

Automatic recovery is not happening but when restarted this comes back...! 
Suggests that the physical connection is okay...! 

We can only try out with a new chassis (if we have one spare) and explore..! Seems unlikely..but worth trying. 

Regards 
Probir 

----- Original Message ----- 
From: "Ruben Fair" <rfair at jlab.org> 
To: "Tyler Lemon" <tlemon at jlab.org> 
Cc: "Probir Ghoshal" <ghoshal at jlab.org> 
Sent: Monday, February 20, 2017 8:40:08 AM 
Subject: Re: [Dsg-hallb_magnets] TR817F2 at 325K, LV cRIO restarted 

Tyler, Probir, 

Could this just be a bad connection? Either on the LV chassis D connector or on the terminal blocks? 

Ruben 


From: "Tyler Lemon" <tlemon at jlab.org> 
To: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org> 
Sent: Monday, February 20, 2017 8:20:42 AM 
Subject: [Dsg-hallb_magnets] TR817F2 at 325K, LV cRIO restarted 

Hello, 

This morning, Cerenox TR817F2 was at 325 K. Torus LV cRIO has been restarted to correct error since the automatic recovery is not working. 

Looking at MyaViewer (plot is attached), there are a few times where the Cerenox reading dropped to ~15 K before jumping to 325 K (seen as vertical lines on plot). These vertical lines have not been seen when other Cerenoxes have jumped to 325 K. The vertical lines could mean that the LV cRIO is trying to reinitialize the Cerenox, but there is something preventing the Cerenox from fully recovering after just running the start-up algorithm for it. 

I will continue to look at what changes can be made to the LabVIEW to prevent a sensor from maintaining 325 K. 

All Cerenoxes that have had the 325 K error have been in either LV Chassis 1, LV Chassis 2 or LV Chassis 4. These three LV Chassis all read into the LV cRIO through the same NI-9870 module. In the mean time, swapping Torus LV cRIO module 1 for a spare would eliminate the possibility that the cRIO module in-use is bad. Where would the spare be kept? 

Best regards, 
Tyler 


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