Training, Installation & Service Manual - Livewire Connections Ltd

Removal and replacement of ADU modules
• Decoding the input from the Optical Rotary Encoder (ORE).
• Incorporating a break function when not powered.
4. Cross elevation motor and encoder.
5. Zero Reference Module (x4, 3 in the previous figure, 1 in the next
figure) (ZRM) (not visible on photo).
In order to be able to find the predefined zero point of the
antenna direction, HALL sensors and corresponding magnets
mount in the gearwheels. Due to the magnetic hysteresis
behaviour of the hall sensor, the software will have to make the
magnets pass the hall sensor in both directions, and when use
the mean value as the zero point.
The ZRM features two LEDs; one for indication of power supply,
and one for indication of zero point.
6. DC-Motor Driver Module for elevation (on the bottom side)
(DDM).
As in item 3 above.
7. Elevation motor and encoder (not visible on photo).
8. Polarisation Motor Module (PMM).
The PMM shall - based on inputs from the PCM - control the
angle position of the Polarization Mechanism Assembly (PMA).
The PMM board is:
• Communication slave of the ADU Bus also connecting the DCmotor
Driver Modules (DDM), the Inertial Sensor Module
(ISM) and the Pedestal Control Module (PCM).
• Driving a stepper motor, with micro stepping capability.
• Motor Filter which filters electrical noise and minimizes
acoustic noise.
• Detection of temperature and power level from the Ortho
Mode Transducer (OMT).
• Decoding the HALL-sensor input from the Zero Reference
Module (ZRM).
• Decoding the input from the Optical Rotation Encoder (ORE).
9. Polarisation motor.
10. Polarisation encoder (not visible on photo).
11. Block Up Converter (BUC). (behind cable screen, not visible on
photo)
The BUC converts the L-band (950 to 1700 MHz) Intermediate
Frequency (IF) up to Ku-band (13.75-14.50 GHz (extended)) radio
signal, and amplifies it to transmit power level. It receives
transmit signal and power from VIM.
9-14 Chapter 9: Service & maintenance 98-133966-E2