[Dsg-hallb_magnets] MPS Comm Alarm
Eugene Pasyuk
pasyuk at jlab.org
Mon Aug 10 10:18:51 EDT 2020
This will be morning. Once they take beam away I can start bringing magnets down and notify you.
-Eugene
From: Probir Ghoshal <ghoshal at jlab.org>
Date: Monday, August 10, 2020 at 10:16 AM
To: Eugene Pasyuk <pasyuk at jlab.org>, Nicholas Sandoval <sandoval at jlab.org>, Brian Eng <beng at jlab.org>, dsg-hallb magnets <dsg-hallb_magnets at jlab.org>
Cc: Ruben Fair <rfair at jlab.org>, Stephen Bueltmann <bueltman at jlab.org>
Subject: Re: MPS Comm Alarm
Thanks Eugene,
Any time that you can suggest, morning or afternoon?
Let me explore and see the availability of Brain and Nick.
Regards
probir
________________________________
From: Eugene Pasyuk <pasyuk at jlab.org>
Sent: Monday, August 10, 2020 10:15 AM
To: Probir Ghoshal <ghoshal at jlab.org>; Nicholas Sandoval <sandoval at jlab.org>; Brian Eng <beng at jlab.org>; dsg-hallb magnets <dsg-hallb_magnets at jlab.org>
Cc: Ruben Fair <rfair at jlab.org>; Stephen Bueltmann <bueltman at jlab.org>
Subject: Re: MPS Comm Alarm
Good morning,
There will be a maintenance day tomorrow and no beam to us. We could ramp magnets down to safely apply those patches to the magnet controls.
-Eugene
From: Probir Ghoshal <ghoshal at jlab.org>
Date: Friday, August 7, 2020 at 1:57 PM
To: Eugene Pasyuk <pasyuk at jlab.org>, Nicholas Sandoval <sandoval at jlab.org>, Brian Eng <beng at jlab.org>, dsg-hallb magnets <dsg-hallb_magnets at jlab.org>
Cc: Ruben Fair <rfair at jlab.org>
Subject: Re: MPS Comm Alarm
Excellent..!
Regards
Probir
________________________________
From: Eugene Pasyuk <pasyuk at jlab.org>
Sent: Friday, August 7, 2020 1:51 PM
To: Probir Ghoshal <ghoshal at jlab.org>; Nicholas Sandoval <sandoval at jlab.org>; Brian Eng <beng at jlab.org>; dsg-hallb magnets <dsg-hallb_magnets at jlab.org>
Cc: Ruben Fair <rfair at jlab.org>
Subject: Re: MPS Comm Alarm
I see on the accelerator white board a maintenance day coming Tuesday on day shift. It could be an opportunity to ramp magnets down and apply those fixes.
I’ll let you know if it happens or not. I guess we will know Monday morning.
-Eugene
From: Probir Ghoshal <ghoshal at jlab.org>
Date: Friday, August 7, 2020 at 1:27 PM
To: Nicholas Sandoval <sandoval at jlab.org>, Brian Eng <beng at jlab.org>, dsg-hallb magnets <dsg-hallb_magnets at jlab.org>
Cc: Eugene Pasyuk <pasyuk at jlab.org>, Ruben Fair <rfair at jlab.org>
Subject: Re: MPS Comm Alarm
Brian, Nick,
So how long will this take to carryout the work as suggested?
Eugene - will there be a window/an opportunity to work on when the magnets are at 0 A?
Please let us know and we can plan out if that is going to be quick (Brian and Nick to suggest)
Regards
Probir
________________________________
From: Dsg-hallb_magnets <dsg-hallb_magnets-bounces at jlab.org> on behalf of Nicholas Sandoval <sandoval at jlab.org>
Sent: Friday, August 7, 2020 12:32 PM
To: Brian Eng <beng at jlab.org>; dsg-hallb magnets <dsg-hallb_magnets at jlab.org>
Subject: Re: [Dsg-hallb_magnets] MPS Comm Alarm
Hi Brian,
Thanks for this. Yes it is definitely important to reset the MPS comms as soon as possible. If the system tries to initiate a controlled ramp down while communication is lost the PLC will notice it is not progressing as it should and would initiate the MPS ramp down. Once initiated we cannot recover until back to 0 amps again.
having looked at the MPS comm reset it is in the 'initialize' sub routine that we reset the current setpoint to 0 amps, we can easily comment out this portion at the next opportunity.
-Nick
________________________________
From: Dsg-hallb_magnets <dsg-hallb_magnets-bounces at jlab.org> on behalf of Brian Eng <beng at jlab.org>
Sent: Friday, August 7, 2020 11:25 AM
To: dsg-hallb magnets <dsg-hallb_magnets at jlab.org>
Subject: [Dsg-hallb_magnets] MPS Comm Alarm
Figured I'd post to the mailing list and get input rather than posting to the entries themselves; regarding the logentries related to this: https://logbooks.jlab.org/entry/3821968
If this particular alarm comes up again it probably would it be better to reset it as soon as possible?
While nothing is in danger we end up losing most of the software controls when the PLC can't talk with the power supply. Instead it's mostly hardware protection, fortunately during the last long break a lot of faults got moved to a slow dump in hardware, but best to not let it get that far.
The only reason I'd hesitate to make that the SOP is that is as Eugene noted it started to ramp down after resetting, which isn't very surprising. Any suggestions?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/dsg-hallb_magnets/attachments/20200810/91cd9d60/attachment-0001.html>
More information about the Dsg-hallb_magnets
mailing list