Subject: Re: [sloan-25mlog 4821] 2.5m obslog 20191213 (SJD 58831)
From: John Downey
Date: Mon, 16 Dec 2019 12:17:30 -0700
>=20
> Mirror numbers
> I got software error while issued the command
> tcc set focus=3D0
> 22:47:03 OBSERVER.elenam 33 tcc f text=3D"Sub-command(s) failed:=20
> move 857.0000,2.6996,12.7500,-38.3500,156.5133: Cancelled while queued=20=
> by new command '232 move 857.0000,2.6996,12.7500,-38.3500,156.5133'"
> 22:47:03 CmdDone: OBSERVER.elenam 33 tcc set focus=3D0.0
> But the focus has been set to zero, anyway and numbers are ok.=20
The thing to do in such a case is watch the migs to make sure that the =
mirror is actually moving.  It sounds like it was, but galils are not =
especially smart, the software is easily fooled into an inactive waiting =
state where nothing happens, but it reports cached position numbers, =
confusing the issue and making it not clear that nothing much is =
happening.
When in doubt, look at the migs.  If they show change in position then =
an error like this is just some kind of software bug that caused the =
queued command to be canceled.
>=20
> 00:01Z - Opened
> # Cartridge 3
> # Acquisition fiber 3 on cart 3 showed up in the flat, but there were =
no stars
> in it, so we effectively had no acquisition fibers. Fiber 4 was also =
dark.
The purpose of reporting bad acquisition fibers is to tell us which we =
need to replace, so if it shows up in the flat its not a bad fiber and =
you don't need to report it.  In a few cases the fiber is just dropped =
from the plate and the fiber techs can check it and replug it if the =
plate isn't done yet.
If you have acquisition fibers (#3 and #11) in the flat, then the fiber =
being dark on field is a pointing problem - the pointing is not close =
enough to see a star in the ~25" field of view of the fiber.  There is a =
procedure for doing a spiral search in such a case.
Cartridge 3 has a number of dead guide fibers, 8, 15, & 16, as well as =
currently #11.  Number 11 will be replaced eventually, once #3 goes too. =
 The acquisition fibers are the only ones we can replace, the smaller =
guide fibers are all glued into the guider button that was then polished =
like one big ferrule.  The larger fibers in this button (two acquisition =
and one tritium star) have individual ferrules secured in the button by =
a set screw.