- 1 Access to the LN fill system from outside
- 2 the lnfill console window
- 3 When do I have to reboot the lnfill IOC?
- 4 How do I fill one detector remotely?
- 5 what do I do about overtimes?
- 6 what do I do about undertimes?
- 7 case of blown fuse on AB
- 8 det no and fill line
- 9 How to set the temperature thresholds
- 10 misc
Access to the LN fill system from outside
To access the LN fill EPICS pages from outside, do the following
- ssh -X email@example.com (or ssh -x gamop@ln2con, where findhose works)
- ssh -X dgs@dgs1
- launch the LN EPICS control pages by typing 'lnmain'
If you do not have an account on sonata, the (green) gateway machine to onenet, you should talk to Ken Teh about getting an account on the machine
the lnfill console window
cu -s 9600 -l /dev/ttyS0
When do I have to reboot the lnfill IOC?
When there is a valve overtime, it is necessary to reboot the IOC for the alarm to the dialer to reengage.
If it is just a temperature alarm, it is not necessary to reboot the IOC
How do I fill one detector remotely?
This is typically done if a detector warms up before the next fill or after a problem like a clogged bayonet has been fixed.
Locate the EPCICS control screen for the detector in question, then
- open the valve for tank you want to use
- and the associated exhaust valve for the line
- wait for the temperature at the exhaust valve to bottom out (meaning that there is now liquid there)
- put the exhaust valve back into 'auto mode' again
- open the valve to the detecor you want to fill
- wait for the temp at the detector return to bottom out (meaning that there is now liquid there)
- return the detector valve to 'auto mode'
- return the tank valve to 'auto mode'
what do I do about overtimes?
- clean bayonet
- check for leaks in line
when you have solved problem, do a manual fill and don't forget to reboot the IOC
what do I do about undertimes?
- fill manually after the tank fill!? Or bad sensor? NOT SURE
- reboot lnfill
case of blown fuse on AB
If a number of detectors have overtime in the same manifold, there may be a blown fuse on an AB module. Look for red 'fuse'. Replace fuse and locate the bad valve. Then switch to a another fill line and disable the bad valve that caused the short
det no and fill line
on ln2con you can say 'findhose' to determine what fill line belongs to the detector that is warming up
How to set the temperature thresholds
To see the current temperature and the alarms limits, as gamop on ln2con, do this (shown for det 107) cd /home/gamop/lnfill_logs set_hilo_lim 107 MOD107_DV_TEMP.HIHI 91 MOD107_DV_TEMP.HIGH 86 MOD107_DV_TEMP 78.4094 MOD107_DV_TEMP.LOW 66 MOD107_DV_TEMP.LOLO 61 to change the limits so HIGH is 78+10, LOW is 78-10, HIHI=78+20 and LOLO is 78-20, type this: set_hilo_lim 107 78 Old : MOD107_DV_TEMP.HIHI 91 New : MOD107_DV_TEMP.HIHI 98 Old : MOD107_DV_TEMP.HIGH 86 New : MOD107_DV_TEMP.HIGH 88 Old : MOD107_DV_TEMP.LOW 66 New : MOD107_DV_TEMP.LOW 68 Old : MOD107_DV_TEMP.LOLO 61 New : MOD107_DV_TEMP.LOLO 58 after that you will see: set_hilo_lim 107 MOD107_DV_TEMP.HIHI 98 MOD107_DV_TEMP.HIGH 88 MOD107_DV_TEMP 78.2947 MOD107_DV_TEMP.LOW 68 MOD107_DV_TEMP.LOLO 58 One should set these limits when the detectors are nice and cold.
- do not start a full fill of GS from 8pm to midnight while GT is present
- if a detector starts to warm up less that an hour before the next fill, it is best to leave it alone and wait for the fill. That is to avoid fill under-times at the regular fill which will just cause other problems