[Dsg-hallb_magnets] 32K issues - update ?

[Brian Eng]

I don't think we can definitively say one way or the other where the fault is; because even with using a target voltage instead of target power it did have a spike to 325 K, but it recovered instead of getting stuck.

We were hoping to narrow down why it recovered (but for that we need it to mess up, which so far it hasn't). So the one time we want it to screw up it gives us weeks of smooth running, even with an ESR temp spike along the way.



So as to not send so many emails, in regards to Ruben's question of if we keep the test going...

I'd leave it as-is until either it does something unexpected, we verify it can recover the spikes, or it comes to a critical time when a reboot of the cRIO would cause more issues than now (i.e. the magnet is about to be powered). Currently the only issue with how the cRIO is setup is that if it is rebooted it will revert to the previous version, but in order to deploy the new code we'd need to reboot it (interrupting the current test).

> On May 15, 2017, at 4:06 PM, Probir Ghoshal <ghoshal at jlab.org> wrote:
> 
> Tyler, Brian,
> 
> This suggests that glitches are not from the hardware/chassis, but external to the chassis..!
> Regards
> 
> Probir
> ----- Original Message -----
> 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>, "Ramakrishna Bachimanchi" <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