[Dsg-hallb_magnets] Solenoid VT monitoring

[Pablo Campero]

Ruben/Probir 

Thanks for the info. 
DSG referred to the mentioned spreadsheet (" Hall B Solenoid Quench Detector Channel assignment and Voltage Limits for Hardwired QD and Software_Feb 21st 2018_v5 ") used for the voltage taps thresholds and combinations considered for each QD channel. 
Base on this spreadsheet and archive data/root files for VT, we added the possible voltage taps values that could be contributed to generate the Solenoid Fast Dump, the following are the results found: 
QD #/ Channel 	Approx VT Sum Value [mV] 	QDs Set Threshold [mV] 
1/ 1 	100[mV] 	201/-186 
1/3 	155 [mV] 	1520/-1500 

2/4 	80[mV] 	1650/1640 
As we can see none of them exceeded the set thresholds on the QDs to cause a trip. 

Pablo 


From: "Probir Ghoshal" <ghoshal at jlab.org> 
To: "Pablo Campero" <campero at jlab.org> 
Cc: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org> 
Sent: Wednesday, February 21, 2018 1:09:48 PM 
Subject: Re: [Dsg-hallb_magnets] Solenoid VT monitoring 

Thanks Pablo, 

Really appreciate your thoughts and questions. 

If you talk to Brian, your will know this is still on going..! 

The h/w QD are two wires of the designated section across components like splices and coils..! 
But the S/w sum's are through ISO A and crio and added up to make the section identical to the h/w section cover in the QD....! 

Hardware threshold are different than the s/w threshold...sums and others. 

second Question about "which VT generated the fast dump? we are still evaluating.." 

The question is - all nine days the magnet was okay but as soon as magnet sensed that is going to be ramp down, decided to fast dump. We need to see carefully (out of the box) what else can effect the magnet...that cascades slow to effect...eg temp..Why and how?? 

Ruben has organized a meeting this afternoon to review the data..your are most welcome to attend (Brian E will be attending). 

Regards 

Probir 

----- Original Message ----- 
From: "Pablo Campero" <campero at jlab.org> 
To: "dsg-hallb magnets" <dsg-hallb_magnets at jlab.org> 
Sent: Wednesday, February 21, 2018 11:09:51 AM 
Subject: [Dsg-hallb_magnets] Solenoid VT monitoring 

Hello Probir, 

DSG noticed during the last Solenoid fast dump (02/19/2018) that voltage taps SUM values did not exceed the set thresholds on the QD1. 
Are the QDs supposed to look at the SUM of the voltage tap combinations values or the QDs are configured to check the voltage tap values individually to then compare with the set thresholds? 
Which voltage tap/s generated the last Solenoid fast dump? 

Regards, 
Pablo 

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