Chapter 3
Theory of Operation
P/N 79000035_SM, Version 1.5 3 - 33 Focus 30/35 Service Manual
Block diagram
Fig. 3-32 Servo drive system block diagram
A microcontroler is used for the position control of the motors. The vertical- and horizontal angel
sensors deliver the instantaneous angel values via serial interface to the microprocessor. The target
angle values are sent by the instrument manager, the tracker system or the application of an external
device. The raw data delivered by the knobs will be calculated to target angle values depending on
their rotational speed and rotational direction so the instrument turns in analogous manner. This part
of software, a “virtual gearbox” turns the instrument faster or slower like the knob will be turned by
Switch off
Stop
Instrument manager
Tracker
PC
Angle
sensors
Knobs
interface
Virtual
gearbox
Conversation
to angles
Target
angle
Current
angle
Main state machine
Emergency stop detection
Manual movement detection
Motor program generation
Low level motor control
Stepper
motor driver
Stepper
motor driver
Stepper
motor driver
Stepper
motor driver
Hz coarse
drive motor
Hz fine
drive motor
V coarse
drive motor
V fine
drive motor
Motor controler program
Fine drive
range check and centering
per software and light barrier
Main control board
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