Subject: Re: [sdss3-25mlog 1788] 2.5m obslog 20140604 (MJD 56813)
From: Kaike Pan
Date: Thu, 5 Jun 2014 07:32:52 -0600
Last three nights, we had quite a few problems, and you two made extra
efforts,  minimized our on-sky time lose,  took science data for the =
project.
It has been tough nights for you.  Observer team would like to say thank=20=
you to both of you!!!
-kaike
On Jun 5, 2014, at 5:33 AM, dmbiz@apo.nmsu.edu wrote:
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>                       APACHE POINT OBSERVATORY SDSS 2.5M
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>                                 OBSERVING LOG
>                          Wednesday June 04, 2014
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>                                  (MJD 56813)
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> ----  Observing Team ----
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> Patrick Gaulme
> Dmitry Bizyaev
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> Kaike Pan (evening startup)
> Jon Brinkmann (evening startup)
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> ---- Observing Plan ----
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> 4 Jun 2014  56813.0  0.47  03:29 10:34  13:20 20:26  BOSS  7.1 hours
> + APOGEE after LST 15h
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> ---- Observing Summary ----
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> Clear night with several tech problems after the start of the night.=20=
> We work with 2 open FF panels (excluding taking BOSS calibs) for the
> whole night. =20
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> Evening was a hot start because engineers returned us the telescope at =
sunset
> only, with 1 FF petal in "unknown" condition, and two more not =
operable (will
> stay open for the whole night, except BOSS calibrations).=20
> Also, after the works, the
> fork outlet UPS was found turned off, so we had to turn it on and do =
home/relax
> mirrors after sunset to let
> their numbers go properly. Finally, with a delay, we were able to get =
science
> data for BOSS RM plate and switch to APOGEE after that.
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> At 5:11, during BOSS science exposure, "fork outlets" power supply =
went off by
> its own. As a result, we lost guide stars, and had to trip down and =
power cycle
> the power supply. Fortunately, all mirror numbers went back to the =
previous, and
> we did not have to do the home/relax of the mirrors again. Only 15-min =
exposure
> was lost due to this problem.=20
> After than we have ~5-6 more power failures like this, see log. Every =
time it
> was fixed by going to the lower enclosure and turning off/on the fork =
outlets
> UPS. It held us from re-doing home mirrors. Without
> which (after each such failure!) we are unable to adjust focus and =
scale for new
> plates.=20
> Finally, we found a bad fan on the power supply block, fixed it, and =
then the
> failures stopped.=20
> THIS IS A DANGEROUS PROBLEM, please inspect the fork outlets power =
supply and
> UPS during the day.=20
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> BOSS plate exposed:
> 11 7339 : RM plate. clear sky, decent seeing. Numerous go-outs of the =
guide
> stars because of flickering power supply. see log.=20
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> APOGEE plates exposed:
> 3 5935 045-06_A   : 2 x ABBA + sky flat.  no missing, 4 faint fibers
> 5 5926 SGRCMA-04_A: 2 x ABBA + 1 x AB, 3 missing, 1 faint
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