Date: Wed, 28 Nov 2012 23:56:22 -0000 (UTC)
Subject: Re: [sdss3-25mlog 948] Re: 2.5m obslog 20121127 (MJD 56259)
From: "Garrett Ebelke"
Hi Dan,
I haven't seen an email from Howard yet, but I thought I'd elaborate on
this. I believe it was cartridge 1 that Howard was mounting on the
telescope. In STUI, I noticed that the MCP window showed that the "SP2
Slit" was "Bad" and red. I asked Howard if he could try remounting the
cartridge and we got the same "SP2 Slit Bad" error.
I decided to go down to the telescope to visually inspect that slithead
and on my way down, from 4th night tiredness, I mentally thought it was
SP1, so we pulled the two carts (1 and 8 I believe) out to inspect the
slitheads for any obvious signs of damage. Since we were looking at SP1,
we didn't see anything, but didn't check the other slithead.
We tried remounting Cart 1 and the MCP still showed "SP2 Slit Bad", and
Howard lowered the instrument lift about 6 inches, then raised it back up
and before the pendent showed 500lbs, the flashing green light went away
and the MCP showed "SP2 Slit In".
-Garrett
>
> On Nov 28, 2012, at 6:01 AM, hjbrew@apo.nmsu.edu wrote:
>
>>
>>                       APACHE POINT OBSERVATORY SDSS 2.5M
>>
>>                                 OBSERVING LOG
>>                          Tuesday November 27, 2012
>>
>>                                  (MJD 56259)
>>
>> ----  Observing Team ----
>>
>> Garrett Ebelke
>> Howard Brewington
>> afternoon - Olena Malanushenko
>>
>> Support and otherwise
>> ---------------------
>> John Parejko
>> Paul Harding
>> Kaike Pan
>>
>>
> .
> .
> .
>> Notes for engCrew and developers:
>> ----------------------------------
>> We lost about 15 minutes because the SP2 slit-head would not latch. We
>> got a
>> green blinking (east)indicator lamp. But, after unlatching and latching
>> about
>> three times, it finally worked.
>>
>
> Hi Howard,
>
>    We looked at the proximity sensors for the slithead latches and both
> appear properly adjusted.  The cartridge we tested with worked fine.
> For us to be able to investigate further we would need the cartridge
> number with which the problem occurred.
>
>    Note that a green blinking light means that the latch isn't in the
> right place.  This may or may not mean the slithead isn't in the right
> place.  In the case of APOGEE (which doesn't use slitheads except for
> guiding), the sp2 slithead doesn't actually do anything. It may require
> switching to manual mode on the lift if it doesn't want to let the lift
> go down with the blinking status light, but it should be possible to
> continue with observing if this problem happens again and cycling the
> latch doesn't correct it.  If it does happen again, please note the
> cartridge number.
>
> 			Cheers,
>
> 			  Dan
>
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