AuxTel Mount Fails to Move#
Overview#
This troubleshooting procedure is necessary when the AuxTel mount experiences a failure to move,
specifically due to the azimuth max velocity error exceeded
.
Users will observe the telescope remaining stuck with ATMCS reporting FAULT
.
Error diagnosis#
When attempting to move the telescope via point_azel
or Scheduler, the faults are the followings:
The ATMCS get
FAULT
state , ATMCS provides specific error messages indicatingFAULT`
in azimuth drives #1 and #2, with bothFAULT
bits activated.The ATPtg get
FAULT
state
Fault event in ATMCS while in tracking enable state.
Azimuth max velocity error exceeded. ATMCS Real-Time Application.vi/MOUNTDEV.vi
/Generic Device.lvclass:Run.vi:1530004/MOUNTDEV.lvclass:NormalDeviceLogic.vi/MOUNTDEV.
lvclass:ProcessDeviceLogicStateTransitions.vi/MntcTrackEnabledState.lvclass:
ProcessStateTransition.vi/mount_fault_state_procedure.vi
Fault event in ATMCS while in tracking enable state.
Azimuth drive #2 fault bit is ON. Azimuth drive #1 fault bit is ON.
Azimuth max velocity error exceeded. ATMCS Real-Time Application.vi/
MOUNTDEV.vi/Generic Device.lvclass:Run.vi:1530004/MOUNTDEV.lvclass:
NormalDeviceLogic.vi/MOUNTDEV.lvclass:ProcessDeviceLogicStateTransitions.vi/
MntcTrackEnabledState.lvclass:ProcessStateTransition.vi/mount_fault_state_procedure.vi
Procedure Steps#
Note
Make sure everything is in a safe or idle state before troubleshooting.
To resume observations, nudge the telescope out of its position by slewing only in altitude to lower elevation. Then, nudge it incrementally in azimuth, starting with 1-2 degree increments to then increasing to 20-degree increments.
From LOVE
Stop the Scheduler and clear any pending scripts. From the queue, send the
auxtel/scheduler/stop.py
script.Cycle the ATMCS and ATPtg. If necessary, to CSCs to
STANDBY
and back toENABLE
.Slew the telescope in small increments using the
auxtel/point_azel.py
script.If the telescope is pointing at a higher elevation, move it lower.
Start with azimuth and elevation coordinates close to the current position, for instance, from Az= 57.64 deg move to Az=58.00 deg.
If the initial azimuth-only nudge fails, try nudging in the opposite azimuth direction.
Gradually increase the amplitude of azimuth slews.
Example sequence of successful slews:
STEP
1
2
3
4
5
6
7
8
9
10
11
12
Azimuth
57.64
58
60
58
56
54
40
20
1
80
120
150
Elevation
45
45
45
45
45
45
45
45
45
45
45
60
Resume Scheduler, if desired.