18 Service Manual
2. Unit Description CRANEX
®
Novus e
Unit control
The unit is controlled by a microprocessor on L1200
(CPU board). It continually monitors and controls the
operation of the unit. A serial peripheral interface com-
munication protocol (SPI - RS485) and direct digital I/O
are used to monitor most of the unit functions.
The microprocessor:
- monitors the optosensors
- monitors control (touch) panel keys
- controls unit movements during exposures
- starts, controls and stops x-ray generation
- controls the digital imaging chain
- controls unit / PC communications
The necessary unit settings and parameters for all the
imaging programs are stored in the memory which is
also on L1200.
Motors and motor control
There is one stepper motor and one AC-motor in the
unit.
The stepper motor drives the rotating unit (R-move-
ment). The stepper motor is driven and controlled by
R5100 (3-Phase Microstepper Driver).
The AC-motor (Z-motor) adjusts the height of the unit
(Z-movement), and the motor is activated by L1600. To
activate the Z-motor L1600 must receive a control sig-
nal from L1200 and a separate control (enable) signal
from the Z-movement (up/down) keys.
An emergency switch on the front of unit disables the Z-
motor (Z-movement) and stepper motor (R-movement)
when pressed.
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