MDM Trouble Report for 2013 Mar 14

Telescope: 2.4m
Observer(s): Jacob brown, Marat Musin (University of Missouri Columbia)
Instrument: OSMOS

Problem(s) Encountered:
We had a couple issues with the sequencer of the IC. At the 
beginning of the night, the sequencer went down. We attempted 
to restart the IC computer but that failed. With Eric's 
help, we were able to do a cold start of the whole system, 
which seems to fixed the problem. We lost about 30 minutes of 
observation time. 

 Later in the night around 1 am the sequencer 
went down again. We noticed the OSMOS 
temperature was -78.5 C. We stopped doing imaging and 
pointed telescope to zenith and filled OSMOS which got
the temperature under control. After the temperature  went -90 C
we restarted the IC computer which fixed the sequencer problem
and were able to go back to collecting data. We lost about
1 hour of observation time due to this. We then periodically
went and check the OSMOS temperature to make sure it did not go 
up again. OSMOS returned to a temperature of -122 C after 
50-60 minutes.  We suspect that the problem with the IC could 
have been caused by the high OSMOS temperature. 

We also noticed each time filling OSMOS that the liquid nitrogen
was spraying out of the valve after 20 seconds of turning 
it on. From past experiences this takes 3-5 minutes so we are 
not sure if there is something wrong with the dewer that needs 
to be looked at. To be on the safe side we let it run for about 
3 minutes to make sure the OSMOS was filled.


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Submitted on 2013 Mar 15 [7:25:53]