Subject: Re: [sdss3-25mlog 1012] 2.5m obslog 20130102 (MJD 56295)
From: Elena Malanushenko
Date: Thu, 3 Jan 2013 14:13:44 -0700
This is what I concerned.=20
I do not know why mcp did not slow down after middle=20
of track, how to detect this stage of mcp, and how=20
to correct the motion.  I am waiting for John, he might=20
suggest something.=20
In code, I check if alt go below of destination than apply brake.
It worked last night. Message -- "go to below 6 - brake".
I try to apply advanced check as Russell suggested to have
one more layer of protection. I will do this as soon as possible.=20
This is work around.=20
I understand the stress of observers.=20
I am very sorry.=20
Elena
On 01 /03/ 13, at 4:50 AM, kinemuchi@apo.nmsu.edu wrote:
> ---- Problems in Detail ----
>=20
> At 6:45Z we sent the telescope to 6 degrees to park the enclosure.  We =
used
> Elena's goToSix script at the podium, and the telescope went to 3 =
degrees.  The
> velocity of the telescope did not decrease after the telescope was at =
14
> degrees.  Here is the output from the script window:
>=20
> FROM AFTERNOON CHECKOUT (everything is normal):
> 0:14:41
> semaphoreOwner =3D TCC:0:0
> az=3D121.00,  alt=3D30.30,  rot=3D  0.03
> alt=3D30.303708  --> altDes=3D6,  Down
> tcc   axis stop ..
> mcp  sem_take ..
> mcp  alt move 6 ..
>     i=3D0  dt=3D 2.36  alt=3D30.24   vel=3D-0.12
>     i=3D1  dt=3D 4.54  alt=3D29.63   vel=3D-0.38
>     i=3D2  dt=3D 7.83  alt=3D28.56   vel=3D-0.61
>     i=3D3  dt=3D10.66  alt=3D25.96   vel=3D-0.97
>     i=3D4  dt=3D13.29  alt=3D22.83   vel=3D-1.27
>     i=3D5  dt=3D15.82  alt=3D19.09   vel=3D-1.56
>     i=3D6  dt=3D18.25  alt=3D15.18   vel=3D-1.41
>     i=3D7  dt=3D20.74  alt=3D12.01   vel=3D-1.14
>     i=3D8  dt=3D22.90  alt=3D 9.59   vel=3D-0.88
>     i=3D9  dt=3D25.01  alt=3D 7.94   vel=3D-0.65
>     i=3D10  dt=3D27.28  alt=3D 6.79   vel=3D-0.41
>     i=3D11  dt=3D29.54  alt=3D 6.14   vel=3D-0.17
>     i=3D12  dt=3D31.55  alt=3D 6.00   vel=3D 0.00
> moved to destination, brake
> mcp  alt brake.on ..
> mcp  sem_give ..
> End:  semaphoreOwner =3D None
>=20
> FROM SHUTDOWN DUE TO HUMIDITY/DEWPOINT: (Note: Temperature was at -10C =
when we
> issued the goToSix script):
>    The velocity did not slow down once the telescope was past 18 =
degrees.  In
> comparison, at afternoon checkout the velocity reduced when the =
telescope was=20
> past 15 degrees.
>=20
> 06:46:56
> semaphoreOwner =3D TCC:0:0
> az=3D121.00,  alt=3D30.00,  rot=3D -0.00
> alt=3D29.999997  --> altDes=3D6,  Down
> tcc   axis stop ..
> mcp  sem_take ..
> mcp  alt move 6 ..
>     i=3D0  dt=3D 2.22  alt=3D29.92   vel=3D-0.13
>     i=3D1  dt=3D 4.81  alt=3D29.39   vel=3D-0.36
>     i=3D2  dt=3D 8.28  alt=3D27.56   vel=3D-0.73
>     i=3D3  dt=3D10.95  alt=3D25.27   vel=3D-1.01
>     i=3D4  dt=3D13.55  alt=3D22.12   vel=3D-1.30
>     i=3D5  dt=3D16.05  alt=3D18.30   vel=3D-1.59
>     i=3D6  dt=3D18.72  alt=3D14.41   vel=3D-1.62
>     i=3D7  dt=3D20.85  alt=3D10.01   vel=3D-1.62
>     i=3D8  dt=3D23.15  alt=3D 6.51   vel=3D-1.62
>     i=3D9  dt=3D25.33  alt=3D 2.91   vel=3D-1.62
> go to below 6 - brake
> mcp  alt brake.on ..
> mcp  sem_give ..
> End:  semaphoreOwner =3D None
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> We manually moved the telescope back to 6 degrees by adjusting the
> counterweights to the lower limits.  Once the telescope was above 6 =
degrees
> altitude, we issued the Stow command in the telescope controls window =
at the
> podium, and the telescope went to that position without any trouble.  =
The
> enclosure and telescope are parked until weather improves or the night =
ends. =20
>=20
> We do not know what caused the glitch in the goToSix script.