Removal and replacement of ADU modules
98-133966-G1
Chapter 8: Service & maintenance
8-41
8888
Service & maintenance
8.5.8
Replacing motor and encoder
The ADU is equipped with three (3) DC-motors, two of which are
identical, and one (1) step motor, for the axes:
• Elevation (DC motor).
• Azimuth (DC motor).
• Cross Elevation (DC motor).
• Polarisation motor (step motor).
The DC-motors are all brush less motors, controlled by their individual
DDM. The step motor is controlled by its PMM. To each of the DC-
motors and step motor a corresponding encoder provides feedback of
its position.
For step-by-step instructions see:
Removing the Elevation Motor and Encoder
Inserting a new Elevation Motor and Encoder
Inserting a new Azimuth Encoder
Removing the X Elevation Motor and Encoder
Inserting a new X Elevation Motor and Encoder
Removing the Polarisation Motor
Inserting a new Polarisation Motor
Removing the Polarisation Encoder
Inserting a new Polarisation Encoder
Figure 8-45: Motors and encoders
Polarisation encoder
Polarisation
motor
Azimuth encoder
Azimuth motor
Elevation
motor & encoder
X elevation
motor & encoder
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Summary of Contents for Sailor 900 VSAT
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