david.barker@LIGO.ORG - posted 12:41, Tuesday 31 October 2023 - last comment - 17:34, Friday 03 November 2023(73871)
h1lsc0 h1asc0 powered down for IO Chassis +24V DC power supply replacement
Fil, Dave, control room:
In preparation for Fil's replacement of the +24V DC Power Supply which is powering h1lsc0 and h1asc0's IO Chassis, I have powered down these two front end computers.
Process was:
- stop all models
- fence computer from Dolphin fabric
- power down computer
- verify via IPMI
IPMI Reports:
- h1lsc0: Power is currently off.
- h1asc0: Power is currently off.
WP 11502
Kepco power supply replaced. Both IO chassis and FE computers powered on.
Tue31Oct2023
LOC TIME HOSTNAME MODEL/REBOOT
12:59:06 h1lsc0 ***REBOOT***
12:59:07 h1asc0 ***REBOOT***
13:00:42 h1asc0 h1iopasc0
13:00:42 h1lsc0 h1ioplsc0
13:00:55 h1asc0 h1asc
13:00:55 h1lsc0 h1lsc
13:01:08 h1asc0 h1ascimc
13:01:08 h1lsc0 h1lscaux
13:01:21 h1asc0 h1ascsqzifo
13:01:21 h1lsc0 h1sqz
13:01:34 h1lsc0 h1ascsqzfc
Attached sqz sdfs that Naoki and I set so that SQZ would come back in a good (with FC DOWN) state. Lots of these will need to be re-accepted later when SQZ is relocked as some of our sfae.snap and observe.snaps are linked files.
Jenne checked sdfs for h1asc, h1ascimc, h1lsc, h1lscaux.
Attached are SDF tables for h1lsc, h1lscaux, and h1asc. There were no diffs for h1ascimc.
The tables have the mask set to ALL, so that it was showing also differences that are not monitored, since *everything* gets reverted to the safe value when we boot a computer.
For h1lsc, I only accepted the TR QPD B offsets, to keep them roughly close to how they are when we've been locking. These do get reset every lock (which is why they are not monitored), but if we don't accept them then we'll struggle more than usual with finding IR when we're ready to relock. Everything else is either guardian controlled, or otherwise not so important.
For h1lscaux, I don't really know why those values of 500 were saved to have those oscillators on, but the scope shows that we don't usually actually use them. This sdf table is not reverted upon each relock (but would have been when we rebooted), so that's likely why we never noticed / cared about these values. Anyhow, we don't want random oscillators on (even if the output matrix is zeros so those don't go anywhere), so I accepted them to zeros.
For h1asc, I didn't accept any changes, but just in case we have confusion later, I took a screenshot of the diffs that we have.
There were no diffs at all for h1ascimc, so I didn't bother taking a screenshot of an empty SDF table.
Austin is working on bringing the IMC back online, and the alignment looks quite poor. In retrospect, I should have (and forgot to do) offloaded the IMC WFS to the suspensions, since the reboot will have lost the integrated alignment offsets that we were sending to the IMC suspensions. Austin is going to revert the IMC sus to their earlier top mass osem values as a way of hand-offloading the WFS, and hopefully the IMC will lock and behave after that.
H1-ISC-C1 IO ASC & LSC power supply was replaced on Tuesday. Supply location H1-VDC-C2 slot 22A (left side).
Outgoing Supply S1201935 Incoming supply (blank) New supply has ball bearing fan.
Outgoing supply had sleeve bearing fan that failed due to being worn out. Will replace with ball bearing fan and put back into spares inventory when parts are available.
F. Mera, F. Clara, M. Pirello