[evlatests] EVLA tests of Sept 7

[Ken Sowinski]

> Approximately 40 minutes later, the antenna stowed
> itself and corrected the elevation limit; 

I had a mysterious experience last night which bears on this.
Antenna 14 was again driven into a limit because the antennas
were pointed before the script was properly started.  Why that
happened is another story.  By the time I was called the 
antenna had probably been in a limit for some time: the exact
time can be found in the monitor data base.  In preparation for
getting the antenna out of the limit I asked the operator to be
sure that the ACU was getting valid postition commands by hitting 
the 'go' button while there was a valid elevation in the elevation 
command box.  He did this several times and reported that the 
antenna had started moving up in elevation.  It eventually was
stowed and secured.  All this without having submitted the limit
override command to the ACU.  It seems likely that an antenna 
that wanders into a limit on its own as has been happening lately
will eventually timeout and autostow.  It is not clear whether
an antenna which is purposelfully driven into a limit will also
do so.  This, perhaps, helps explain the behavior Pat reported
above.

Does anyone remember if the ACU was actually designed to operate 
this way?

As an aside the operator reports that there is no box in the new 
ACU screen to type in motor control commands.  Had it been necessary
we would have had to use the old ACU screen for the purpose.

Ken