Date: Sun, 30 May 2010 22:10:14 -0000 (UTC)
Subject: Re: [SDSS3-infrastructure 3128] Re: 2.5m obslog 20100529 (MJD
From: hjbrew@apo.nmsu.edu
We did the closing without turning on any lights because we were trying to
salvage MARVELS's current exposure.  When I arrived at the scope, it was
already at 121,30, and I thought the rotator was idle, which is not
uncommon since we often just move the scope in az an alt when doing a
weather closure.  If the rotator was still moving while slewing to six
degrees alt, that could cause this problem.  We need to revisit our
closing policy.
Howard
> Hi all-
>   I inspected the fiber length down into the cone.  I didn't find any
> obvious damage, but the fibers did have a twist, similar to what happens
> with telephone handset cords.  I unplugged the gang connector and
> un-twisted the cable, maybe this should be a regular maintenance item.
> Also, after trying to envision how the fiber got wound around the ln2
> connector, I suspect the rotator was still moving when the telescope was
> at a low altitude, i.e. low enough to close the building.  Perhaps we
> should complete the rotator move before bringing the telescope down that
> low while the gang connector is plugged in.
>
> Hope this helps!
>   Robert
>
>