[Dsg-hallbgas] [Dsg-mvt] MVT mass flow controller set points

[Amrit Yegneswaran]

marc with regards to your e-mail, here are some clarifications. 


    1. @ 0801 hrs SVT MFCs on the space frame were disconnected by Hall B engineering, which is why the cRIO on the space frame hung up. 
    2. @ ~1030 hrs gotra noted the gas wasn't flowing to the SVT and contacted peter. 
    3. tyler, pablo, amanda, marc restored the cRIO at ~1100 hrs. 
    4. so, the MVT was without gas for ~3 hours. 

Recommendations: 


    1. Hall B detector managers should be informed and should inform their counterparts via the mailing lists prior to any work on any component of the the gas system, so that t appropriate measures can be taken to ensure the safety of the detector. 
    2. MVT and HTCC should invest in owning their own cRIO system, so that all systems are independent, see table. 
cRIO location 
	Systems 
	#of MFCs 
	Available spares 


	SVT 
	1 to 3 
	0 

Space Frame 
	MVT 
	5 
	3 


	HTCC 
	1 
	0 


	
	
	

Forward Carriage 
	LTCC 
	4 
	2 


	
	
	

Gas Shed 
	DC mixing system 
	4 
	1 


	DC supplies 
	3 
	


	
	
	




From: "Marc Mcmullen" <mcmullen at jlab.org> 
To: "Maxime Defurne" <mdefurne at jlab.org>, dsg-mvt at jlab.org, dsg-hallbgas at jlab.org 
Cc: "Bob Miller" <rmiller at jlab.org> 
Sent: Wednesday, March 14, 2018 12:46:45 PM 
Subject: Re: [Dsg-mvt] MVT mass flow controller set points 

Maxime, 

I am passing this information to the Hall B Gas community. Some work was 
done to some of the mass flow controllers which are on the same cRIO as 
the MVT. The gas system has been designed with a fix for mfc related 
issues, so during some circumstances someone who is on-call may be 
required to reboot one of the cRIOs, to reset the mfc software. 

Additional training needs to be conducted if this is a potential problem 
for the MVT. I will bring this up during our meeting, please talk with 
Bob and Stepan so this information is known to all. 

-Marc 


On 3/14/2018 12:32 PM, mdefurne wrote: 
> Hi Marc, 
> 
> Everything is fine (Mixture ratio and flow). 
> 
> But next time, please tell us before rebooting the cRIO so that we do 
> not take any risk (HV was on and if something would not have been good 
> with the gas for any reason, it would have been a disaster). I got a 
> bit scared when I read your e mail :P 
> 
> Cheers, 
> 
> Maxime 
> 
> 
> Le 14/03/2018 à 12:24, Marc McMullen a écrit : 
>> Hi Maxime, 
>> 
>> We had to reboot the cRIO which controls all the mfc for the space 
>> frame, including the mixing system for mvt. Please check your set 
>> points, and manual/automatic settings to ensure you are getting the 
>> desired flow. 
>> 
>> 
> 
> _______________________________________________ 
> Dsg-mvt mailing list 
> Dsg-mvt at jlab.org 
> https://mailman.jlab.org/mailman/listinfo/dsg-mvt 

-- 
Marc McMullen 
Detector Support Group 
757-269-7738 

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