User`s guide

FLAMINGOS at the MMT
reboot it. To do this telnet baytech, userid iocompow (note there's only one m in this userid)
password 16Mb,img. At the prompt type reboot 1, and then type logout when the prompt returns
(e.g., see the example output in 3a, above). Now you must close all three daemons (Temperature, Motor,
and MCE4) and the record_temperatures window and run initflam.pl.
4) Problems when running config.filter.grism.decker.wheels.pl or config.mos.wheel.pl. The script ends by
saying that the time for the wheel's motion to complete has expired.
The default algorithm for motion of the wheels is that they first go to the home position, tell the controller to
zero the position, and then move to the demanded position. We refer to this as a home-type of limit, or limit
switch. We usually run the Mos wheel in an alternative mode refered to as a home-type of near-home. In this
mode the wheel moves from the present position back to somewhere close to home, and then to the demanded
position.
There are two modes of failure for each wheel.
(1) The limit switch fails to engage. If the wheel operates with a limit-switch home type, then the
wheel can spin endlessly, and the perl script will just give up after some time limit. If you can stop
the wheel and determine the location of the mechanism, it is possible to recover from such a failure
and then use the near-home motion algorithm for the wheel.
(2) The wheel binds, and a grinding noise is audible if you stand next to the dewar. If this happens
there usually is no quick recovery after you have stopped the motor.
Solutions:
A) First, you must stop the wheel that is either spinngin endlessly, or is jammed.
1. Type ctrl-Z, type jobs, kill -9 %<jobnumber> if the perl script has not yet finished
and you already know that there is a problem.
2. Type ufmotor -host flamingos1b -port 52004
a) At the motor prompt, type <motor_name>@, where <motor_name> is one of letters a,
b, c, d, or e, where motor a = decker, b = mos, c = filter, d = lyot, and e = grism. This should
do a soft-stop of the motor.
b) Type exit to quit ufmotor.
3. Type turn.off.motor.hold.current.pl (or, alternatively, you can do this through the
engineering pulldown on ufstatus_gui).
If this does not stop the motion of the wheel (e.g., you can hear it spinning, or grinding), the last
recourse is to turn off the motor controller itself. Note: any wheels that use near-home type and
are not at home will be lost when the motor controller is powered up again. You should call for
assistance if this happens. To do cycle the power on the controller, telnet baytech as
motorpow, password 16Mb,img, and then reboot 1, and logout to exit.
B) If the failure was of the limit switch, you need to recenter the mechanism in question, and
redetermine the home point. The best way to do this is to image a very bright star with the telescope out
of focus by about 3000 units. The wheel probably is not well centered, so use one of the tweak scripts
to adjust it. Then step the wheel by discrete positions, and measure the background. With some help
you should be able to determine where you are, and use the ufmotor command to rezero everything.
19/23