Subject: Re: [sdss3-25mlog 288] 2.5m obslog 20111006 (MJD 55841)
From: Kaike Pan
Date: Fri, 7 Oct 2011 09:37:51 -0600
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On Oct 7, 2011, at 6:12 AM, doravetz@apo.nmsu.edu wrote:
>=20
> -------------------
> 11:54Z - We experienced a rotator oscillation. The telescope was at =
121,30,00.
> We pulled all the Stop buttons and after issuing the 'axis init' the =
rotator
> begin its oscillations. We issued 'axis stop', but that did not halt =
the rotator
> oscillatory motion. It was only upon depressing a Stop button that the =
rotator
> stopped oscillating. We were careful to issue an 'axis stop' prior to =
depressing
> Stop buttons last night and after closing in the morning. We did =
notice that the
> fiducial crossing log shows that the telescope had been moved this =
afternoon and
> we don't know whether 'axis stop' was issued following the afternoon =
movements,
> or even whether that actually would have prevented it from happening =
during
> checkout this evening.
>=20
> We had high winds and dust which prevented us from ventilating and =
opening on time.
Yes, "axis stop" may not alway work. It seems to alleviate the rotator =
oscillation so far.
Here is the procedure that we do now:
issuing "axis stop" before depressing stop buttons as you do.
=20
Pull out all stop 'buttons
issue an "axis stop"
issue an "axis init"=20
then track command
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On Oct 7, 2011, at 6:12 AM, doravetz@apo.nmsu.edu =
wrote:-------------------11:54Z - We =
experienced a rotator oscillation. The telescope was at 121,30,00.We =
pulled all the Stop buttons and after issuing the 'axis init' the =
rotatorbegin its oscillations. We issued 'axis stop', but that did =
not halt the rotatoroscillatory motion. It was only upon depressing =
a Stop button that the rotatorstopped oscillating. We were careful =
to issue an 'axis stop' prior to depressingStop buttons last night =
and after closing in the morning. We did notice that thefiducial =
crossing log shows that the telescope had been moved this afternoon =
andwe don't know whether 'axis stop' was issued following the =
afternoon movements,or even whether that actually would have =
prevented it from happening duringcheckout this evening.We =
had high winds and dust which prevented us from ventilating and opening =
on time.Yes, "axis stop" may not =
alway work. It seems to alleviate the rotator oscillation so =
far.Here is the procedure that we do =
now:issuing "axis stop" before depressing stop =
buttons as you do. Pull out all stop =
'buttonsissue an "axis stop"issue an "axis =
init" then track =
command=
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