TITLE: 05/16 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
SEI_ENV state: MAINTENANCE
Wind: 6mph Gusts, 3mph 3min avg
Primary useism: 0.01 μm/s
Secondary useism: 0.09 μm/s
QUICK SUMMARY:
Most of the work for today involves final checks for HAM1
Last night RM2 was left in DAMPED with the damping loops on, whereas RM1 asnd PM1 were also in DAMPED but their damping loops had been turned off. The loops on RM2 excited the suspension until it was causing overflows. This continued all night. It seems strange that the loops that were damping well two days ago are now not damping (ndscope1). I noticed that turning off only the L damping solved the issue of the MASTER_OUTs slowly increasing.
Doing some tests (starting in SAFE and then going to DAMPED), it looks like damping is fine for the first few minutes, after which it very quickly starts exciting instead of damping (ndscope2, ndscope3), and the voltmons start going crazy. I did this test a few times with the same result every time.
Doing the same test but immediately switching L damping off as soon as it turns on, we stay just damping P and Y and have no issues with oscillations or saturations (ndscope4).
I am not sure if this means that the issue is specifically with the Length damping? I am putting RM2 in SAFE for now and I'm going to try the same tests on RM1 and PM1 to see if the same issue exists there.