Specifications

Doc Number: VIS-ANA-VER-01001-9002
Date: 27 May 2004
Issue: 5.0
Page: 69 of 80
Author: J. Delgadillo
Controls Preliminary Design Report Issue 5.doc
CAS CCU + 15 V
CASS CCU – 15V
CASS CCU + 5 V
CASS +24 V
CASS Temperature (CCU)
AZ Read-Head 1, 2, 3, 4 Positions
ALT Read-Head 1, 2 Tape 1 Position
ALT Read-Head 1, 2 Tape 2 Positions
CASS Read-Head 1, 2, 3, 4 Positions
AZ Read-Head 1, 2, 3, 4 Position Errors
ALT Read-Head 1, 2 Tape 1 Position Error
ALT Read-Head 1, 2 Tape 2 Position Errors
CASS Read-Head 1, 2, 3, 4 Position Errors
6. AZ Jitter Image Stabilizer
The Azimuth Jitter Image Stabilizer compensates for Azimuth induced rotary jitter by feeding
the Azimuth error signal into the active Cassegrain axis to counter rotate the image.
7. Cassegrain Slave Mode
The Cassegrain can be commanded to the Slave Mode whereas the Cassegrain Axis motion is
generated based on the Azimuth and Altitude trajectories.
8. Stow Mode
Stow Mode’s purpose is to drive the mount to a safe location and then lock the mount there
with the stow pins. Upon entry into the Stow Mode, position commands are issued to drive
the AZ/ALT/CASS axes to the predetermined location. The stow sequence is to drive to the
designated position and once the location is reached, the axes enables are removed and the
brakes are set.
9. Stop Mode
This mode disables the Azimuth, Altitude and Cassegrain axis drives. It is often referred to
as Standby. “Disabling” signifies that the motor controller enables have been removed, it
doesn’t signify that the motor controller utility (3-φ) power has been removed.
10. Axis Disable
The Axis Disable is similar to Stop Mode with the exception that it allows single axis disable
of the axis drives. This allows the operator the ability to eliminate motion on axes not of
interest and focus on one axis for test or maintenance purposes.