[Astro-mdm-trouble] MDM Trouble Report for 2020 Feb 19

[Eric Galayda]

Yeah... that’s the part I’m unclear about. Thankfully, all checked out fine after replacing the fuse. It is a slow blow, but still. 
Cheers
Eric

Sent from my iPhone

> On Feb 20, 2020, at 13:59, Jules Paul Halpern <jules at astro.columbia.edu> wrote:
> 
> 
> Yet the telescope did move very far, at least in one axis.
> 
> Jules
> 
>> On Thu, Feb 20, 2020 at 3:10 PM John.R.Thorstensen--- via ASTRO-mdm-trouble <astro-mdm-trouble at lists.osu.edu> wrote:
>> 
>> Ah.  Probably a consequence of trying to move with the
>> brakes on.  I blew the windshield-wiper fuse on an
>> old Datsun once by hitting the wiper switch when they
>> were frozen solid in ice.  As an old upstate New Yorker
>> I'm sure you remember what that's like!
>> 
>> John
>> 
>> On Thu, 20 Feb 2020, Galayda Eric via ASTRO-mdm-trouble wrote:
>> 
>> > Blown drive fuse.  Replaced and all seems ok.
>> > ****************************************************** 
>> > ERIC GALAYDA 
>> > Site Manager
>> > MDM Observatory
>> > 950 N. Cherry Ave. Ph. 520.318.8660/1 
>> > Tucson, AZ 85719 email: egalayda at umich.edu  
>> > http://mdm.kpno.noao.edu
>> > ******************************************************
>> >
>> >       On Feb 20, 2020, at 4:42 AM, obs24m--- via ASTRO-mdm-trouble
>> >       <astro-mdm-trouble at lists.osu.edu> wrote:
>> > 
>> > MDM Trouble Report for 2020 Feb 19
>> > 
>> > Telescope: 2.4m
>> > Observer(s): David Schiminovich, Nicole Melso (Columbia University)
>> > Instrument: CHaS
>> > 
>> > Problem(s) Encountered:
>> > When we began astronomical observations, we slewed to the nearest
>> > bright star and noticed that it had not been acquired.
>> > 
>> > After trying a few commanded slews to other positions near the zenith,
>> > we
>> > noticed that the brake was engaged, and was a likely culprit for our
>> > pointing issues.
>> > 
>> > Among the problems we had noticed was that slews were not being
>> > properly completed (as one might expect, given that the brake was
>> > engaged!)
>> > 
>> > Since we were near zenith, we sent a command to disengage the brake.
>> > 
>> > At that point the telescope slewed to a position at dec +88 and hour
>> > angle ~2.
>> > We don't know why this occurred, as we had not entered any targets
>> > with coordinates near that region.
>> > 
>> > Subsequently the telescope would not respond to any commands to move
>> > (slews, zenith command, paddle)
>> > 
>> > We tried restarting the TCS program but also no change.  Eventually we
>> > decided to end observations for the night.
>> > 
>> > 
>> > ------------------------------
>> > 
>> > Submitted on 2020 Feb 20 [4:42:56]
>> > 
>> > Observer Contact Email: ds at astro.columbia.edu
>> > (Note: thiswill not appear in versions of the trouble report archived
>> > online)
>> > _______________________________________________
>> > ASTRO-mdm-trouble mailing list
>> > ASTRO-mdm-trouble at lists.osu.edu
>> > https://lists.osu.edu/mailman/listinfo/astro-mdm-trouble
>> > 
>> > 
>> > 
>> >
>> 
>> --------------------------------------------------------
>> John R. Thorstensen
>> Department of Physics and Astronomy
>> Dartmouth College
>> 6127 Wilder Laboratory
>> Hanover, NH 03755
>> 
>> Office: 239 Wilder Hall
>> Phone:  603 646 2869     Fax: 1446   Hinman Box 6127
>> --------------------------------------------------------
>> _______________________________________________
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