From: John Downey
Subject: Re: [sloan-25mlog 4735] 2.5m obslog 20191029 (SJD 58786)
Date: Wed, 6 Nov 2019 10:24:36 -0700
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> On Oct 30, 2019, at 6:50 AM, elenam@apo.nmsu.edu wrote:
>=20
>=20
>                       APACHE POINT OBSERVATORY SDSS 2.5M
>=20
>                                 OBSERVING LOG
>                          Tuesday October 29, 2019
>=20
>                                  (SJD 58786)
>=20
> ----  Observing Team ----
>=20
> Dmitry Bizyaev
> Elena Malanushenko
>=20
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> Notes
>=20
> 7:29 The disconnection of windBuffel. We noticed that guider stars are =
moving away from=20
> the filed, we tried to make manual offsets, but stars did not stay in =
field.=20
> We also could not move telescope because of ALT brake. We could clear =
this brake, but it=20
> appeared immediately after we call any slew command. After some =
investigation, we have found that windbuffel was disconnected. We turned =
the switch off and on, and it fixed the problem. Manga lost 0.5 hour =
because of hardware.=20
>=20
>=20
> 7:29 During the last exposure, 299074, guider started to=20
> loose guider stars, applying manual corrections did not help. =20
> Stopped the current exposure. Marked is as bad in DOS.
> We tried to move telescope with mcp, but telescope immediately=20
> stopped on brakes. Looking at low enclosure, we noticed that  =20
> windbuffel has been disconnected. Turned it off and on,=20
> and could move the telescope,
> We lost  0.5 hours with this problem.=20
I still don't know what "has been disconnected" means.  Could be very =
different causes - did the switch "fall" to off somehow?  Was the =
amplifier in an error state?  Do we not know and "disconnected" is a way =
of dressing up "not working"?
Here is what I have found so far, there is not much more we can look at =
after the fact and with such a brief description.
This is commanded position vs encoder (real position).  Clearly it was =
having trouble for ~8 minutes before those large steps at the end, which =
are when things started getting cycled - brakes, WB power, etc.
Looking at a couple detailed views of this plot and the brake state, the =
brake set in response to these two diverging greatly.  I have plots of =
that, but two are needed due to limitations of this plotting tool and =
copying them in will probably just confuse things.
Adding in the signal from the wb to telescope transducer - the thing =
that keeps them synchronized, its clear that the cause was the telescope =
bumping the windbaffle:
The "error" voltage is typically small, less than +/- 0.2 VDC while =
tracking and less than +/- 2 VDC while slewing - this is showing almost =
+7 VDC.
I can go find an example of the WB pushing the telescope, but I don't =
think this is similar to that - the fact that it continued to track, =
mostly, with that huge AltWindErr tells me the telescope was able to =
bump the WB along, so the WB must have been in "neutral" so to speak, =
without its brake set, and apparently very well balanced.
I would really like to know what the WB altitude amplifier state was.... =
unfortunately we don't have a lot of archive data on the WB since it has =
its own PLC.
My fear is that the amplifier may have had a failure episode of some =
kind.  If it comes back a couple more times this will turn into a big =
can of worms.
So if this happens again, do not run around power cycling everything to =
get back on sky asap.  We need more info.  Look at the amplifier state, =
look at the interlocks, note everything you can think of, including how =
many times it took power cycling to get things alive again.=
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On Oct 30, 2019, at 6:50 AM, elenam@apo.nmsu.edu =
wrote: =
            &n=
bsp;         APACHE POINT =
OBSERVATORY SDSS 2.5M =
            &n=
bsp;           &nbs=
p;       OBSERVING LOG =
            &n=
bsp;           &nbs=
p;Tuesday October 29, 2019 =
            &n=
bsp;           &nbs=
p;        (SJD 58786)----  Observing Team ----Dmitry BizyaevElena Malanushenko=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3DNotes7:29 The =
disconnection of windBuffel. We noticed that guider stars are moving =
away from the filed, we tried to make manual offsets, but =
stars did not stay in field. We also could not move =
telescope because of ALT brake. We could clear this brake, but it appeared immediately after we call any slew command. After =
some investigation, we have found that windbuffel was disconnected. We =
turned the switch off and on, and it fixed the problem. Manga lost 0.5 =
hour because of hardware. 7:29 During the last exposure, 299074, guider started to loose guider stars, applying manual corrections did not help. =
 Stopped the current exposure. Marked is as bad in =
DOS.We tried to move telescope with mcp, but telescope =
immediately stopped on brakes. Looking at low enclosure, =
we noticed that   windbuffel has been =
disconnected. Turned it off and on, and could move the =
telescope,We lost  0.5 hours with this problem. I =
still don't know what "has been disconnected" means.  Could be very =
different causes - did the switch "fall" to off somehow?  Was the =
amplifier in an error state?  Do we not know and "disconnected" is =
a way of dressing up "not working"?Here is what I have found so far, there =
is not much more we can look at after the fact and with such a brief =
description.This=
 is commanded position vs encoder (real position).  Clearly it was =
having trouble for ~8 minutes before those large steps at the end, which =
are when things started getting cycled - brakes, WB power, =
etc.Looking at a couple detailed views of this =
plot and the brake state, the brake set in response to these two =
diverging greatly.  I have plots of that, but two are needed due to =
limitations of this plotting tool and copying them in will probably just =
confuse things.Adding in the signal from the wb to telescope transducer - =
the thing that keeps them synchronized, its clear that the cause was the =
telescope bumping the windbaffle:The =
"error" voltage is typically small, less than +/- 0.2 VDC while tracking =
and less than +/- 2 VDC while slewing - this is showing almost +7 =
VDC.I can go =
find an example of the WB pushing the telescope, but I don't think this =
is similar to that - the fact that it continued to track, mostly, with =
that huge AltWindErr tells me the telescope was able to bump the WB =
along, so the WB must have been in "neutral" so to speak, without its =
brake set, and apparently very well balanced.I would really like to know what the WB =
altitude amplifier state was.... unfortunately we don't have a lot of =
archive data on the WB since it has its own PLC.My =
fear is that the amplifier may have had a failure episode of some kind. =
 If it comes back a couple more times this will turn into a big can =
of worms.So =
if this happens again, do not run around power cycling everything to get =
back on sky asap.  We need more info.  Look at the amplifier =
state, look at the interlocks, note everything you can think of, =
including how many times it took power cycling to get things alive =
again.=
--Apple-Mail=_55CF1BC5-CEDE-450F-808D-C3140E5B1002
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