MDM Trouble Report for 2006 May 28

Telescope: 2.4m
Observer(s): Nick Morgan (OSU)
Instrument: 8k Mosaic

Problem(s) Encountered:
Right before morning twilight, the dome started rotating while I
was in the middle of an exposure.  It rotated two complete
revolutions in azimuth before I could stop it.

- Flipping the 'auto dome' switch to off (TCS box) didn't stop it.  
- Flipping the 'dome' switch from free to home didn't stop it.
- Shutting off the auto dome enabler (yellow button in control
room) did stop it.

With the yellow button off, I aligned the dome back to 320,
reset the dome az encoder, and then pushed the auto dome
enabler back on.  The dome started rotating as before, continuing
right pass the telescope azimuth.  

So I killed the auto dome enabler again to stop it.  Then
I parked the telescope at zenith.  This time, the dome did not
start rotating when the auto dome enabler was turned back on.  
I switched to 'dome home' on the TCS box and the dome moved 
back to 320 and stopped by itself.  

So I think it is ok now.

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Submitted on 2006 May 28 [5:40:40]