Chapter 3
Theory of Operation
Focus 30/35 Service Manual 3 - 34 P/N 79000035_SM, Version 1.5
the operator.
The program part “main state machine” communicate to the peripheral devices and does the
initialization and the decision of the current operating mode.
The “Emergency stop detection” compares the current angle values to the pre-estimate values and in
case of big deviation it stops the motors immediately and the electromagnetic clamp will be uncliped.
This avoids mechanical blockade and demages of the instrument.
The “ Manual movement detection” monitors the angel values and the position of the fine motion
drive. A high changing of angle values within a range of thresholds is significant as a manual turning
of the instrument. The motor drives and the solenoid will be switched off, so the instrument is easy
to turn in the two axis. It depends on operating mode which of the motors, coarse or fine is selected.
In coarse drive mode the electromagnetic clamp is unlock. Additional the position of the fine motion
lever arm is monitored by the “Fine drive range check and centering” program part. In initialisation
phase the spindle is turned to the middle of range between the two light barriers. The number of motor
steps is a dimension for the position of the spindle, and the fine motion lever arm is centered again
when the spindle comes close to the end of range. The light barrier stops the motor in case of step
loses.
The complete motor drive control works independent for vertical and horizontal drive.
Service
Maintenance
• Grease the spindle axis of fine drive.
• Test of coarse and fine drive by PASS service software
Replacement of service parts
• Fine drive V
• Coarse drive V
• Fine drive Hz
• Coarse drive Hz
• Slip contact Hz (SCH board)
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