[Dsg-hallc_nps] Fw: chiller interlock question

[Aaron Brown]

Just so everyone is on the same page...
I'm working on changes to the program to have the temperature and pressure directly from the chillers trigger an interlock instead of the external flow meters.
________________________________
From: Julie Roche <jroche at jlab.org>
Sent: Wednesday, October 11, 2023 11:54 AM
To: Aaron Brown <ambrown at jlab.org>; Carlos Munoz Camacho <munoz at jlab.org>
Cc: William Henry <wmhenry at jlab.org>
Subject: Re: chiller interlock question


I agree to it.



From: Aaron Brown <ambrown at jlab.org>
Date: Wednesday, October 11, 2023 at 11:53 AM
To: Carlos Munoz Camacho <munoz at jlab.org>
Cc: Julie Roche <jroche at jlab.org>, William Henry <wmhenry at jlab.org>
Subject: Re: chiller interlock question

Hi Carlos,



If everyone agrees, I can go ahead and start making those changes.



-- Aaron





________________________________

From: Carlos Munoz Camacho <munoz at jlab.org>
Sent: Wednesday, October 11, 2023 11:39 AM
To: Aaron Brown <ambrown at jlab.org>
Cc: Julie Roche <jroche at jlab.org>; William Henry <wmhenry at jlab.org>
Subject: Re: chiller interlock question



Hi Aaron,



   I agree, the chiller values seem to be reliable (that means that we should put those in the alarm handler, too). I would still keep the delay to trip the HV relatively large (~30min) to give the crew time to figure out if there is a real problem (unlikely) or a false alarm. We could have a yellow alarm in the alarm handler with a safer threshold than the one trips the calorimeter HV.



Thanks,

Carlos



On Wed, Oct 11, 2023 at 5:31 PM Aaron Brown <ambrown at jlab.org<mailto:ambrown at jlab.org>> wrote:

Hi Julie et al.,



I'm working on the code to try and ensure that the chillers doesn't cause an hv interlock due to "weird" values (false alarms).

Would you prefer to have the external flow meters trigger the interlock (current version of the code has the temperature and pressure from the flow meters able to trigger an interlock), or would you rather use the readback temperature and pressure directly from the chiller.

My vote is for the values directly from the chillers as those haven't shown the same tendency to return "weird" values as often.

What do you think?



Best,

Aaron
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