[Dsg-hallb_magnets] 32K issues - update ?

[Tyler Lemon]

Hello Probir, 

Brian's code using the fixed voltage does appear to be working. 

As Brian previously mentioned, we are still waiting for any temperature spike to confirm that the system can automatically recover with the code currently deployed. We have yet to see any of the temperature spikes we are monitoring for, so it is hard to say whether the error just hasn't happened (since we know there can be long stretches between the errors) or the fixed voltage code added is preventing/has solved the error. 

I will make the modifications to the Solenoid LV cRIO program to implement the fixed voltage for Cerenoxes. As you requested, the maximum fixed voltage will be 5 mV. 

Best regards, 
Tyler 


From: "Probir Ghoshal" <ghoshal at jlab.org> 
To: "Brian Eng" <beng at jlab.org>, "Pablo Campero Rojas" <campero at jlab.org> 
Cc: "Tyler Lemon" <tlemon at jlab.org>, "Nicholas Sandoval" <sandoval at jlab.org>, "Ruben Fair" <rfair at jlab.org>, "Ramakrishna Bachimanchi" <bachiman at jlab.org>, "Renuka Rajput-Ghoshal" <renuka at jlab.org> 
Sent: Friday, May 26, 2017 10:13:37 AM 
Subject: Re: 32K issues - update ? 

Hi Brian, Pablo, 

Could you please confirm that the CODE finally deployed on torus (so called Brian's code) is working successfully with 15 mV max.! 
Second, if that is the case, could you please deploy the same on solenoid as well but to 5 mV max for solenoid. 

Thanks and regards 

Probir 



----- Original Message ----- 
From: "Probir Ghoshal" <ghoshal at jlab.org> 
To: "Ramakrishna Bachimanchi" <bachiman at jlab.org>, "Brian Eng" <beng at jlab.org> 
Cc: "Tyler Lemon" <tlemon at jlab.org>, "Nicholas Sandoval" <sandoval at jlab.org>, "Pablo Campero Rojas" <campero at jlab.org>, "Ruben Fair" <rfair at jlab.org> 
Sent: Monday, May 15, 2017 4:30:27 PM 
Subject: Re: 32K issues - update ? 

Rama, 

Please suggest the fixed voltage required for Solenoid, as you have suggested in the past needed to be ~5 mV instead of 15 mV as we have used for torus. 

Thanks Brian and Rama for getting this sorted (seemed) finally...! 

Regards 

Probir 
----- Original Message ----- 
From: "Ruben Fair" <rfair at jlab.org> 
To: "Brian Eng" <beng at jlab.org> 
Cc: "Tyler Lemon" <tlemon at jlab.org>, "Probir Ghoshal" <ghoshal at jlab.org>, "Ramakrishna Bachimanchi" <bachiman at jlab.org>, "Nicholas Sandoval" <sandoval at jlab.org>, "Pablo Campero Rojas" <campero at jlab.org> 
Sent: Monday, May 15, 2017 4:26:47 PM 
Subject: Re: 32K issues - update ? 

Ok - so we keep it going for another few weeks? 



From: "Brian Eng" <beng at jlab.org> 
To: "Ruben Fair" <rfair at jlab.org> 
Cc: "Tyler Lemon" <tlemon at jlab.org>, "Probir Ghoshal" <ghoshal at jlab.org>, "bachiman" <bachiman at jlab.org>, "Nicholas Sandoval" <sandoval at jlab.org>, "Pablo Campero Rojas" <campero at jlab.org> 
Sent: Monday, May 15, 2017 4:25:38 PM 
Subject: Re: 32K issues - update ? 

At the very least it performs similarly to the previous setup, i.e. it isn't any worse than using a target power. 

I'd still like to have seen it get an error and recover by itself though. 

> On May 15, 2017, at 4:12 PM, Ruben Fair <rfair at jlab.org> wrote: 
> 
> Tyler, 
> 
> Does this suggest strongly that we should move to a fixed voltage source for all the Cernox sensors? 
> 
> Ruben 
> 
> From: "Tyler Lemon" <tlemon at jlab.org> 
> To: "Ruben Fair" <rfair at jlab.org> 
> Cc: "Brian Eng" <beng at jlab.org>, "Probir Ghoshal" <ghoshal at jlab.org>, "bachiman" <bachiman at jlab.org>, "Nicholas Sandoval" <sandoval at jlab.org>, "Pablo Campero Rojas" <campero at jlab.org>, "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org> 
> Sent: Monday, May 15, 2017 4:02:11 PM 
> Subject: Re: 32K issues - update ? 
> 
> Hello Ruben, 
> 
> The fixed voltage source deployed on April 21, 2017 is still deployed and running. 
> 
> There was one instance on 4/29/2017 when a Cerenox jumped to 325 K, but after one second it automatically corrected itself to a normal reading. 
> 
> There have been no other instances of a Cerenox jumping to 325 K since. 
> 
> Regards, 
> Tyler 
> 
> From: "Ruben Fair" <rfair at jlab.org> 
> To: "Brian Eng" <beng at jlab.org>, "Tyler Lemon" <tlemon at jlab.org> 
> Cc: "Probir Ghoshal" <ghoshal at jlab.org>, "Ramakrishna Bachimanchi" <bachiman at jlab.org>, "Nicholas Sandoval" <sandoval at jlab.org>, "Pablo Campero Rojas" <campero at jlab.org> 
> Sent: Monday, May 15, 2017 3:56:04 PM 
> Subject: 32K issues - update ? 
> 
> Brian, Tyler, 
> 
> What is the update on misbehaving sensors? 
> 
> Are you still employing the constant voltage approach? 
> 
> Regards 
> 
> Ruben 
> 

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