Subject: Re: [sloan-25mlog 4190] 2.5m obslog 20180918 (SJD 58380)
From: John Downey
Date: Wed, 19 Sep 2018 07:31:40 -0600
>=20
> Notes for engineers & developers:
>=20
> 1. SP1 does not read out when exposures are taken.  When flats are =
taken, SP2
> shutter does not open and Hartmann doors do not move.
We'll look into that today.  At least the solenoids are easy to get to.
>=20
> 2. Although we did no science tonight, we noticed that the BOSS =
"exposureId"
> number did not update and does not match the exposure numbers of files =
written
> to disk. This may have resulted from "boss exposureId" failing to =
update while
> an exposure doesn't complete successfully.  Frame numbers on disk =
increase
> because data from SP2 (and only SP2) are read out and written to the =
disk.
>=20
> 3. Only one of the two cooling fans is running on the big PLC "#4" =
rack on the
> lower level.
>=20
> 4: at 09:39Z, we got SP1 phaseBoot alerts.
> Serious 	boss.SP1PhaseBoot Reported by camCheck
> Serious 	boss.SP1ExecBoot Reported by camCheck
Probably related to the ongoing problems with SP1
>=20
> We noticed that R1's temperature stays consistently at -124.6 while =
the set
> temperature was -121.  After the phaseBoot followed by bossIack, R1's =
set-point
> dropped from -121.1 to
> -126.6.
>=20
> 5. 11:50Z The secondary nitrogen fill concluded on its own without our =
having to
> intervene.
>=20
> 6. While watching the secondary nitrogen fill, of curiosity we looked =
for but
> did not notice a protective plastic guard for B2's saddlebag.
It is a piece of clear transparent plastic like you use with an overhead =
projector.  It is above the saddlebag and bends around behind it and is =
held to the rotator with some of our ubiquitous white tape.
If you look carefully between the 10L dewar and the short cabling that =
goes from the saddlebag to the camera, you can see the offending cryo =
line with some torn insulation touching the plastic shield, usually with =
some water between the line and plastic shield (surface tension holds =
the water there - its a lot easier to miss without the shield =
installed).
>=20