Subject: Re: [sdss3-25mlog 1471] 2.5m obslog 20131108 (MJD 56605)
From: Dan Long
Date: Sat, 9 Nov 2013 06:16:30 -0700
Hi Audrey and Garrett,
   The imager loop no longer exists.  The temperature sensors are still =
in the system since a disconnected sensor will affect the measurements =
of other sensors in the bank.  The imager loop sensors are in the cable =
tray above the hanging racks.
   The cartridge cover latches will be checked/tightened as they are =
encountered in plugging (the rest on Monday), and the mounting bolt for =
16 will be replaced as soon the proper part is located.
		Cheers,
		   Dan
On Nov 9, 2013, at 5:31 AM, asimmons@apo.nmsu.edu wrote:
>=20
>                       APACHE POINT OBSERVATORY SDSS 2.5M
>=20
>                                 OBSERVING LOG
>                          Friday November 08, 2013
>=20
>                                  (MJD 56605)
>=20
> ----  Observing Team ----
>=20
> Garrett Ebelke
> Audrey Oravetz
> Dan Long (support)
>=20
>=20
.
.
.
> In response to yesterdays Day Log re: TEC Chiller Pump - Not sure if =
this is=20
> related or not, but after sending out the night log last night we =
noticed that=20
> in the TPM Temperature Graphics Truss window, the "Imager Glycol =
Supply"=20
> temperature is roughly +4-5deg above ambient, while the "Imager Glycol =
Return"=20
> is roughly +2-3deg above ambient. This doesn't quite make sense. If =
you follow=20
> the logic of a coolant system, the supply should be cooler than the =
return=20
> (since the return is coming back after removing heat from various =
systems). With=20
> this thinking and looking at the other loop, the "Spectro Glycol =
Supply" is=20
> roughly +0-1deg above ambient, while the "Spectro Glycol Return" is =
roughly +2-
> 3deg above ambient, which seems reasonable. After speaking with JonB =
about this=20
> in passing, he brought up the question if the Imager Glycol Return =
line actually=20
> does anything now or if those sensors are obsolete.
>=20
> We've noticed that quite a few of the slithead cover latch mechanisms =
are coming=20
> loose. The "stake" piece of the clamp that is attached to the =
cartridge by 2=20
> small bolts is loosening up due to the bolts coming loose. Please =
check them and=20
> add loctite as needed.
>=20
> Cartridge 16 - When inspecting the cartridge bay in the evening, we =
discovered=20
> that the kinematic mounting block facing North (while cart is in the =
bay) is=20
> missing one of the four mounting bolts. If I recall correctly, these =
mounting=20
> blocks are mounted with the 4 bolts and 2 alignment pins, so as long =
as the=20
> other 3 bolts are tightened down, it should still be safe to mount. We =
have=20
> contacted Dan Long to verify this thinking.
>=20
>=20
> _____________________________________________________
> Message 1471 of sdss3-25mlog - Logs of nightly APO activities.
> =
https://trac.sdss3.org/tracmailman/browser/private/sdss3-25mlog/all/1471.h=
tml
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