Date: Mon, 31 Dec 2007 13:59:32 -0500 (EST)
From: jeg@astro.princeton.edu
Subject: Re: 2.5m obslog 20071230 (MJD 54465)
Good work, all.
The automatic system is doing its job. Please note that you must
NEVER attempt to mount the imager unless all the latches show
`unlatched', so you did exactly the right thing. The saddle latches
can be moved by hand to dangerous positions, so the manual unlatch
cycle at the beginning of the night *might* be a good idea. You can
also move the saddle latch levers back by hand until the unlatched LEDs
light (as you discovered), which is probably less trouble, though the
primary and secondary latches cannot be moved by hand and will damage
whatever you try to lift if they are not completely retracted (unlatched).
and `damage' in the case of the spectroscopic corrector almost certainly
means breaking the *glass*, so trust the automatic system, *and* be
careful.
Happy new year and thanks
--jim
On Mon, 31 Dec 2007, kaike pan wrote:
>
>>
>> Night:
>> ------
>>
>> 23:50Z - Attempted to mount imager, but had problems raising the lift with
>> the
>> imager on it. Note that we didnt have any problems removing/installing a
>> cartridge, as well as the corrector. The lift raised about 5 inches and
>> stopped. The hand paddle was reading ~1300. We noticed that one of the
>> lights
>> to the saddle latch switch on the instrument changing panel was off. Maybe
>> there is a latch in the way that is setting off an interlock? Since we were
>> having trouble with this and most likely wouldnt be able to fix this
>> hardware
>> problem in time to image most of the stripe, we decided to stick to
>> spectroscopy.
>>
>
> Thanks to Dan Long, Elena, and Audrey for fixing it. The other way to fix it
> is
> to switch to manual mode (if you are sure that the problem is one of latch
> being
> in mid-postion of unlatched and latched), then cycle unlatch, latch saddle
> with
> imager fully down. we should see the LED lights back to normal. Then we can
> switch
> back to auto mode to mount the imager.
>
>  Happy New Year to all.
>
> -Kaike
>
>
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