Removal and replacement of ADU modules
8-32 Chapter 8: Service & maintenance 98-137654-A
8.5.6 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 on page 8-33
Inserting a new Elevation Motor and Encoder on page 8-34
Removing the Azimuth Motor on page 8-35
Inserting a new Azimuth Motor on page 8-38
Removing the Azimuth Encoder on page 8-40
Inserting a new Azimuth Encoder on page 8-43
Removing the X Elevation Motor and Encoder on page 8-44
Inserting a new X Elevation Motor and Encoder on page 8-46
Removing the Polarisation Motor on page 8-48
Inserting a new Polarisation Motor on page 8-49
Figure 8-31: Motors and encoders
Polarisation encoder
Polarisation
motor
Azimuth encoder
Azimuth motor
Elevation
motor & encoder
X elevation
motor & encoder
SAILOR100TM.book Page 32 Tuesday, January 29, 2013 2:44 PM
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