Abbott VP 2000 Service Manual page 51

Section 3
Abbott VP 2000™ Processor Service Manual
30-608308/R1—September 2008
The Y-Table is moved up and down by a vertical lead screw.
The Y-Motor is a 120 VAC bi-directional motor. It is mounted
in the X/Y Table and drives a small pulley connected by the
Y-Drive Belt to a larger pulley connected to the vertical lead
screw that moves the Y-Table up and down. To sense vertical
position two photo interrupters are mounted on the X-Table.
A metal-tab flag on the Y-Table intersects these sensors to
indicate when the Y-Table (and thus the Slide Basket) is in the
up or down position.
The Rotation Robotic Arm incorporates a 12 VDC uniphase
stepper motor (Z- rod Rotation motor). The Robotic Arm has
an internal microswitch that senses any obstruction that
blocks and the Slide Basket when moving downward.
If the basket encounters an obstruction while moving
downward, the basket movement activates a microswitch that
causes the unit to stop operation for approximately five (5)
seconds. The arm will then return to the uppermost position
and immediately move downward again. If the obstruction
has been removed, the system will continue to carry out the
operating program of manual command it was under. If the
obstruction is still present, the arm will hit it a second time
and will stop. After five (5) seconds have elapsed an alarm will
sound. The alarm can be turned OFF by clicking on "ABORT"
in the maintain menu, this also causes the arm to move to the
up position. If for some reason the operator clicks on "ABORT"
without removing the blockage, this cycle will continue.
A male electrical connector on the Rotation Arm is inserted
into a female connector in the Y-Table. Power for the
Rotation-motor and signals from the Rotation Arm, the
Z-motor is held rigid relative to the Y-Table. When the motor
shaft is driven, the Robotic Arm rotates as required. The Arm
itself has a metal flag that intersects photo sensors mounted
on the frame of the Rotation Arm Assembly. There are two (2)
photo sensors positioned to identify full rotation to the Back
and full rotation to the Front.
Theory of Operation
3-15