Specifications

Doc Number: VIS-ANA-VER-01001-9002
Date: 27 May 2004
Issue: 5.0
Page: 68 of 80
Author: J. Delgadillo
Controls Preliminary Design Report Issue 5.doc
3. Manual Position (Offset) Mode
The Manual Position (Offset) mode can be superimposed on trajectory pointing or
positioning mode. It allows the operator to manually command position offsets to the
position loop mode operating in conjunction. This allows the trajectory pointing mode or
positioning mode to be fine-tuned.
4. Preset Position Mode
The Preset Position Mode contains 40 selectable AZ/ALT/CASS positions. Execution of the
Preset Position Mode relocates the mount to a position defined by the stored positions.
5. Signal Meters
The MCU can display eight signals simultaneously in a bar graph format. Each signal has a
minimum and maximum range selection. The first three signals selected are output to the
AZ/ALT PDU Analogue Test Points located on the PMU bracket, the 4
th
– 6
th
signals
selected are output to the CASS PDU Analogue Test Points located on the PMU bracket.
The analogue voltages are limited to +/- 5Vdc. Additionally, the CCU Interface board
provides the above mentioned 3 analogue test points from the AZ/ALT PDU and 3 analogue
test points from the CASS PDU to the Data Acquisition Unit. The Data Acquisition Unit
digitises these signals and the signals then become available over the CANOpen interface.
These signals can be used for troubleshooting purposes.
The list of available signals is:
AZ, ALT, CASS Position Command
AZ, ALT, CASS Position Error
AZ, ALT, CASS Position Feedback
AZ, ALT, CASS Rate Command
AZ, ALT, CASS Encoder Velocity
AZ, ALT, CASS Sum Rate
AZ, ALT, CASS Current Command
AZ Motor 1, 2, 3, 4 Rates
ALT Motor 1, 2 Rates
CASS Motor 1, 2 Rates
CASS Cable Wrap Motor Rate
AZ Motor 1, 2, 3, 4 Current
ALT Motor 1, 2 Current
CASS Motor 1, 2 Current
CASS Cable Wrap Motor Current
AZ/ALT CCU + 15 V
AZ/ALT CCU – 15V
AZ/ALT CCU + 5 V
AZ/ALT +24 V
AZ/ALT Temperature (CCU)