[Hallb-engineering] DC R2 pressure and Helium Buffer dewar problems

George Jacobs jacobsg at jlab.org
Mon Dec 6 08:48:46 EST 2010

The DCGAS IOC must have been rebooted and loaded the incorrect default 
values. This happens because the default EPICS boot up values are wrong. 
I made temporary changes, but the wrong default values will load again 
if the IOC is rebooted.

The default values should be as follows with no LOW or HI;
HIHI 0.100
LOLO 0.010

HIHI 0.100
LOLO 0.010

HIHI 0.100
LOLO 0.010

kashy at jlab.org wrote:
> Hi I got a page last night ~ midnight from the counting house on DR R2
> pressure tickling the .03 low alarm. I asked them if they had checked long
> term range of this pressure. The answer was no. I asked if the DC was
> operating normally, the answer was yes.
> I check the LOLO value of the alarm it is .01 so I had them put the LOW
> value to .015
> George or Denny, Please check out the system if we need to make this
> change permanent or fix something else.
> After 3am I got another page on the LHe dewar. The IOC had crashed and the
> shift guys could not get it going. I talked them through it. This was the
> second crash in less than 24 hrs. Why? And we need to get the proper
> values in the reboot script. Earlier when this happened I saved the proper
> settings, but when we do a restore they do not come back properly.
> Thanks
> Dave
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George Jacobs
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(email) jacobsg at jlab.org


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