Hugh, Sheila, Jenne, filling in for Patrick
We are filling in for Patrick at the moment because he is helping Fil to use the beckhoff test stand in the H2 building. We are trying to lock now after Patrick and Jenne did a full initial alignment.
This morning, Fil, Vern, Elli, Nutsinee and I swapped out the End Station 2 Beckhoff Chassis, because all the modules on the right rail were in the state INIT NO_COMM, and we could not change their state by requesting different states (including safe) or clearing errors. We swapped the chassis with a spare. Hugh and Patrick burt restored plc1,2,3 to 10 pm last night.
When we first arrived we saw that the high voltage power supplies for the ESD were off, Fil turned them on and restored the settings. This may be because the vacuum gauges which are controlled by beckhoff would have tripped them off. The ESD driver was off, but we did not reset it believing that we could reset it remotely. Later Betsy reset it by driving back to EY after she could not reset it in the normal way remotely.
Elli quickly noticed that something was amiss with the ring heaters at end Y, which are controlled by the same beckhoff chassis. We checked that the settings were all the same, it seems like there is some difference between the 2 chassis.
Fil, with help from several people, has spent most of the afternoon with the chassis we removed. We had trouble getting a test set up going that we could use to diagnose the problem, so Hugh, Jenne, and I are relieving Patrick for a few hours so he and Fil can work together on the removed chassis. They think that they have found a problem with one of the modules, and are currently replacing that module.
We are about to reach low noise (with the spare chassis, and incorrect power on the ring heaters). We hope to see that the comb is gone, and if we see that we may break the lock to revert to the old chassis if possible.
Patrick's notes about his shift:
10 am PDT safety tour changed from X end to Y end(this may have broken our noisy lock this morning)
18:11 UTC placed beckhoff chassis at End Y
18:20 UTC Rick retrieves (?) PCAL out of optics lab
18:30 UTC Dick in optics lab out at 12:41 PDT
18:31 UTC Fil restarts beckhoff computer (Guardian to down)
a little while later h1ecaty1 burt restores to 22:10 Sep 14
18:53 UTC Jeff B, Jason retrieve part from optics lab (?)
12:38 PDT UPS truck at LSB
20:37 start of initial alignment finished at 21:22
20:54 Sheila to H2 electronics back 20:56, Fil is still there
20:58 Betsy to EY to restart ESD back 14:31
To clarify, I didn't go to the optics lab as noted in Patrick's log. When retrieving the PMC from the optics lab was approved, I let Jason know that there was an opportunity to go to the lab, which he did as noted by Patrick.