TITLE: 03/08 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: None
SHIFT SUMMARY:
Locking went well with the exception of a couple of HEPI pump trips that were physically induced. It was a good exercise and allowed for a small update to the SEI>HEPI wiki instructions for those who are more in the dark about SEI than others
LOG:
16:45 Jeff out to LVEA - shooting pics of ITMs
17:16 Jeff Back
17:24 Kyle out to EY - mechanical room
17:35 Nominal Low Noise - 113.206 Mpc
17:49 LockLoss - EY mechanical room activity tripped HEPI
18:02 Hartmann team (TJ and Daniel) out to LVEA to check SLED
18:06 Jim and Fil to EY to recover HEPI
18:35 Hartmann team back
18:50 Kyle back
18:54 EY HEPI pump recovered - waiting for isolation to resume locking
19:10 EY SEI WDs tripped again
20:03 re-locking resumed
20:49 Nominal Low Noise - 100Mpc
21:33 LockLoss - high bounce mode
22:25 Begin Initial Alignment
22:52 Resume locking
23:50 H1 locked at NLN - 113Mpc
Today I found the pressure relief line of the EndY HEPI full of fluid (a couple feet of 1/2" or something hose.) This is usually an indication to me that the pump station experienced a high pressure event on the output. Attached is a snap of the output pressure and the control signal around 8 March--if this is the time this over pressure occurred it is a pretty good indication of how observant I really am given that I've been there 6 or 8 times since then!
Anyway, the plot shows that several attempts were made at restarting/repowering things after the fuse blow in the above entry. The data shows the output of the controller at max, 2048 while things were reengaged and spiking the pressure and opening the pressure valve letting fluid escape. The last one, I'm not sure why it was different but was at max reading, ~104 psi for 10 to 20 seconds. This is likely the event that filled the relief line with fluid. Looks like time for training!