Removal and replacement of ADU modules
8-44 Chapter 8: Service & maintenance 99-145912-A
8. Loosen the belt tension device by loosening the 4x4 mm Allen
screws (thread size M5)and slide out the Azimuth Encoder.
9. Adjust the belt-tension screw to middle position.
To insert a new Azimuth encoder follow the instructions above in
reverse order while observing the following guidelines:
1. String the Azimuth belt around the pulley of the motor assembly
and left around the encoder/belt tensioner.
2. Adjust the belt tension using the belt-tension adjustment screw.
The tension of the belt is 90-100 Hz on average (use an Optibel
frequency measuring device or alike).
Figure 8-51: Azimuth encoder, remove
Figure 8-52: Azimuth encoder, adjust belt tension
Figure 8-53: Azimuth Encoder, adjust belt tension