TITLE: 12/22 Owl Shift: 08:00-16:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 116Mpc
OUTGOING OPERATOR: Ed
CURRENT ENVIRONMENT:
SEI_CONF state: WINDY
Wind: 5mph Gusts, 4mph 5min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.37 μm/s
QUICK SUMMARY: H1 in Observe, and I noticed the chiller yard at the Corner Station making a loud clicking sound
When I arrived for my shift I noticed a loud clicking sound coming from the Corner Station chiller yard. Ed and I walked out there, and there is a "Switching Failure Alarm," on the pannel near the motor that's making the noise. There's also a periodic release of air. This is not normal for the chiller yard. There's no alarms in the CR, however, this is new since this morning. Calling Richard.
I called Kyle, and he's coming to fix the motor, since it's been running continuously for more than an hour. It was running when I arrived on site at 7:55 UTC, and is still running.
Kyle and I ran through all potential issues, results are below:
- The loudness of the motor is an issue I'm aware of, but had not heard for myself, until tonight, so that alone is not an urgent issue.
- The switching failure alarm is for the drying tower, and is seperate from the continuously running motor.
- Kyle put in an alog on Friday identifying that PT199 isn't reading pressure correctly, and he'll fix next Tueasday. Alog 54022.
- Due to PT199 issues, Kyle had me check gate valves 5, 6, 7, and 8, on the vacuum site overview, and they are all green, indicating that there is sufficient instrument air to keep them open.
ACTIONS as result of the motor running continuously: Kyle is on his way to the site
Approx 9:30 UTC Kyle completed adjustments that put the motor back into a mode of running for a few minutes every few hours.
I'm reposting one picture for OPS, that shows the dial gauge on the tank. This gauge shows the pressure in the tank, and is related to instrument air, in that instrument air can be at this pressure, or above this pressure, but not below this pressure.
When I arrived, I found that the Corner Station instrument air compressor was running continously and the receiver tank's solenoid drain valve was venting every few seconds. I noted that user-adjustable settings (vent duration and frequency) on the new "fancy" adjustable auto-drain valve were incorrectly set. The drain valve was venting the receiver tank too long (6 seconds) and too frequently (every few seconds) such that the compressor was never ever able to increase the system pressure to the shut-off setpoint and the two were in equilibrium at 84 psi (see aLOG entry from Friday) -> THE FIX -> I minimized the duration setting and maximized the frequency setting to allow the compressor to "catch up" with the loss to atmoshpere and, soon, the system pressure reached the setpoint and the compressor shut-off.