aLIGO LHO Logbook

LHO VE (CDS)

chandra.romel@LIGO.ORG - posted 05:55, Thursday 14 December 2017 - last comment - 09:24, Thursday 14 December 2017(39755)

CP7 alarms

At around 5:30 am several text alarms for CP7 rolled in all at once. MEDM screen looks normal. Will be in soon for visual inspection. Alarms are LN2 level error and discharge pressure error. Also got alarms for EY Y2 pressure and RO water system.

Comments related to this report

chandra.romel@LIGO.ORG - 07:06, Thursday 14 December 2017 (39756)

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CP7 and PT-424 signals have all flat lined. In fact all signals at EY have flat lined. Going back out to check Beckhoff rack.

Images attached to this comment

chandra.romel@LIGO.ORG - 07:27, Thursday 14 December 2017 (39757)

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The battery that stores solar energy for Y2-8 gauge at IP isn't charged up enough and caused the gauge to turn off which caused a communications fault at EY. Richard and Patrick are on it.

chandra.romel@LIGO.ORG - 07:32, Thursday 14 December 2017 (39758)

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I misread one of the texts. It was actually EY Y2 CC error (CC=communications). Not PT-424, which just so happens to be labeled "EY_Y2_PT-424"

patrick.thomas@LIGO.ORG - 09:24, Thursday 14 December 2017 (39760)

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Richard, Patrick

The same thing happened at end X later this morning.

The equivalent of the following was done:

end Y:
Disabled Pressure Gauge Y2-8 (BPG 402)
File -> Save All
TwinCAT -> Activate Configuration
Popup: Restart in Run Mode?: Yes
PLC -> Login
Check that the values of the GVL variables are changing
Close and restart the EPICS IOC

end X:
Disabled Pressure Gauge X2-8 (BPG 402)
File -> Save All
TwinCAT -> Activate Configuration
Popup: Restart in Run Mode?: Yes
PLC -> Login
Check that the values of the GVL variables are changing
Close and restart the EPICS IOC

Burtrestore:
On vacuum1:
cd /ligo/cds/lho/h0/burt/2017/12/13/06:00
burtwb -f h0vacex.snap
burtwb -f h0vacey.snap