System Control - Abbott VP 2000 Service Manual

Technical Data

System Control

3-22
The system is primarily operated and controlled by circuitry
on the Computer Control Board and by software. The
Computer Control Board is built around a Z-80
microprocessor. Software is in a 256K E-PROM on the
Computer Control Board.
The interface to the operator is via an external PC.
Connector J4/P4 is the interface to the X-Sensor Board. Data
over this line include the status of the optical sensors that tell
the computer the X-Position of the Robotic Arm. Several
photo interrupter sensors are arrayed horizontally on the
X-Sensor Board attached to the Drive Plate. as the X/Y Table
travels along Drive Rails, a metal tab (flag) passes through the
photo sensors. Signal from these sensors reach the Computer
Control Board via J4/P4.
The Z-Position (Rotation) is sensed similarly. There are tow (2)
photo sensors on the Rotation motor that indicate its
orientation. Signals from these are sent to the microprocessor.
The X and Z motors are stepper motors controlled by the
microprocessor.
Data from two (2) Y-Position sensors on the X/Y Table are also
sent to the microprocessor, indicating whether the Robotic
Arm is in the up or down position.
Data from the Hood Interlock Switches are via connector
P12/J12 (Computer Control Board).
Four (4) Interlock Switches are mounted on the unit, two (2)
on each side at the upper base plate such that the switch
plungers are depressed when the Hoods are closed.
A voltage regulator on the Computer Control Board produces
the 5 V supply for the logic-level signals for the circuitry that
controls the 120 V components, including the Y-motor, the
solenoid valve, and the heater coil and fan.
Section 3
Abbott VP 2000™ Processor Service Manual
30-608308//R1—September 2008