Virgo Logbook

Virgo Runs (VSR2)

maillet" class="link">maillet - 7:06 Saturday 01 August 2009 (24008)

Operation report - Night shift

The ITF unlocked at 1.50UTC probably due to Generator problem at NE, but investigation has to be done because it unlocked few seconds before the actual change of power supply for the 2 UPS. It could be the start of the generator (reported with few seconds delay?) or an other problem on the ITF: at the unlock from science, ISYS got very excited and few minutes were needed to relock it.
I calibrated FModErr using the dedicated macro, as requested in the previous entries.
We were back in science at 04:07UTC (the ITF was unlocked due to NE activity).

Other
AlpGuard restarted at 23.43LT
Security tours (LT):
00:09 > 00:58
02:15 > 03:02
04:10 > 04:57
06:30 >

Images attached to this report

Comments to this report:

sentenac - 10:46 Saturday 01 August 2009 (24013)

The UpsServer collects the data from UPS boxes with a max delay of 5.5 seconds. It is the average elapsed time needed to collect data through all UPS lines (shown at the end of user info in Cl client). Does it explain the delay observed ?

Comments to this report:

maillet - 23:24 Saturday 01 August 2009 (24020)

The ITF unlocked at 3H50M09 and NE_UPS1 goes to 0 3 seconds later while NE_UPS2 goes to 0 9 seconds after the unlock.
Looking at NE F0 accelerometers (v and z), the start-up of the generator happened at 3H50M07S so the first change reported by the UPS server is for UPS1, 2 seconds later. It doesn't explain the small extra delay observed on UPS2.