Use
Case: Prepare for Delay Constant Alignment
Description:
Prepare the AT subsystems so that they are ready for the VLTI ISS to perform
the VLTI Delay Constant Alignment. Check that sub-systems are online, Position
the Nasmyth retro-reflecting mirror in the optical path by rotating the
Nasmyth wheel to the corresponding position. Position the CBSD and the
NDF to the appropriate positions.
Role(s)/Actor(s):
Primary: User (Operator, Maintenance, VLTI-ISS)
Secondary: Coude Beam Switching Device, Nasmyth wheel, M6,
Priority:
Major
Performance:
A
couple of seconds (10 to 15 seconds)
Frequency:
Asynchronous,
typ. once a day before starting observations, or any time for maintenance/test
purpose
Preconditions:
-
Coude Beam switching device is switched On and ONLINE
-
Nasmyth wheel is switched On and ONLINE
-
M6 is ONLINE
-
ROS shutter is open
Basic
Course:
-
Send command PREPDAL to prepare for Delay Constant Alignment
Exception Course: Command failed
-
ATCS Sets
Coude Beam switching device to the "light stop" position (no light
to FSS or FAS)
Exception Course: Command failed
-
ATCS Sets
Nasmyth Wheel to the position for Nasmyth retro-reflecting mirror
Exception Course: Command failed
-
ATCS Centers
M6
Exception Course: Command failed
Alternate
Course:
Exception
Course: Command failed
Postconditions:
-
Devices in appropriate position for Delay Constant Alignment
Issues
to be Determined or Resolved:
Notes:.
Last modified: Thu Jun 28 13:39:34 UTC 2001
![[Design Description
Entry]](../../../Images/arrow.gif){kind=icon}