Date: Sun, 7 Jan 2007 20:57:13 -0000 (UTC)
Subject: Re: 2.5m obslog 20070106 (MJD 54107)
From: hjbrew@apo.nmsu.edu
Hi Dan,
   Thanks for your suggestion.  I checked and tried re-seating the
ops_cart locking pin several times; however, the situation remained
unchanged.  So, I called Wendell.  He suggested that I apply a very
small amount of cleaner (WD-40) to the plunger's shaft of the
locking-pin switch.  While exercising the plunger with my thumb, beyond
lubrication, I noticed that a small red light on the locking-pin switch
was illuminate when the proper contact was made by the plunger's
position.  Unfortunately, the ops_cart, when pinned inside the dog
house, could not close the switch or activate the light.  I also
noticed that the switch's plunger was pressed into place by a 1/4" bolt
that attaches to the bottom of the cart.  So, I loosened this bolt's
locking nut, extended the bolt by about an 1/8", and re-tighten the
locking nut.  Now, with the ops_cart inside the dog house and the
cart's locking pin in place, the small red light is activate and the
Alt axis can be cleared.  I've communicated my findings to Wendell, and
he will check my work tomorrow.  Please feel free to contact me if you
have questions.
Thanks,
Howard
> I'm pretty sure the ops_cart_in_house interlock is referring to the
> locking pin for the imager in the doghouse.  If you haven't tried
> already, I would try reseating that pin and see if the interlock
> clears (the description in the problem section doesn't say if that
> had been tried).
>
> 				Cheers,
>
> 				  Dan
>
>>                        APACHE POINT OBSERVATORY SDSS 2.5M
>>
>>                                  OBSERVING LOG
>>                            Saturday January  6, 2007
>>
>>                                   (MJD 54107)
>>
>>---=== OBSERVING TEAM ===---
>>
>>Howard Brewington
>>Shannon Watters
>>Mike Harvanek (swing)
>>
>>Steph Snedden (support)
>>Craig Loomis (support)
>>
>>---=== OBSERVING PLAN ===---
>>
>>Shakedown.
>>
>>---=== OBSERVING SUMMARY ===---
>>
>>Snow was blowing all around the enclosure so we never opened tonight.  We
>> took
>>spectro monthly biases and darks.  Then we took MSP imager calibration QE
>> data
>>on chips r5, r6, and u1.
>>
>>We had a problem clearing the brake on the altitude while we were
>>finishing for
>>the night because of an "ops_cart_in_house" interlock that we weren't
>> able to
>>clear or bypass (see problems).
>
>  .
>  .
>  .
>
>>
>>
>>When we tried to move the telescope to an alt of 90 to take the
>>cover for taking
>>darks off of the mounted plate we couldn't clear the alt brake.  The
>> interlock
>>was another "ops_cart_in_house".  We had this problem on Dec. 28th and
>> cleared
>>it by putting the cart into position to mount a cartridge, engaged
>>the pin that
>>keeps the cart in place, disengaged it, and removed the cart from under
>> the
>>telescope.  The curious thing this time is that the telescope was moved
>> to an
>>alt of 30 AFTER removing the cart earlier in the night so we can't
>>get the cart
>>under the telescope to try the engage/disengage fix.  We looked for the
>>interlock in the lower enclosure but couldn't decipher which one it would
>> be.
>>This means the telescope cannot move until the interlock is cleared and
>> the
>>cover for taking darks is still on the mounted cartridge.
>>
>
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