ABI Prism® 7900HT Sequence Detection System ... - OpenWetWare

Defining the Bottom
of the Stack
To re-check the position of input stack 1 (Zymark position 4): (continued)
Step Action
8 Click Rotary Offset, andclickYes.
The software re-records the rotary position for the input stack 1(Zymark position 4).
9 While holding the plate, click Open Gripper and remove the plate.
The Automation Controller Software requires a bottom position value for all stacks.
This value is used to prevent the plate handler arm from colliding or grinding as it
moves to the bottom of each stack.
To find the bottom of the stack:
Step Action
1 Remove all plates from the instrument and the plate handler arm.
2 Place an empty plate into the output stack (Zymark position 0).
3 From the Zymark Twister Software, click position 0.
The plate handler arm moves over the output stack.
4 Using the Vertical Positioning commands, lower the plate handler arm until it is just
above the stack.
5 Check the rotary position of the plate handler arm to confirm that the gripper:
♦ is centered over the stack
♦ will not contact the sides of the stack when lowered
6 Using the Rotary Adjustment arrows, adjust the rotational position of the gripper so
that it is centered over the input stack and will not contact the sides when lowered.
7 Using the Vertical Positioning commands, carefully lower the plate handler arm into
the stack. Adjust the Rotary Adjustment value as needed to center the gripper
within the stack.
8 Once the gripper is centered within the stack, click Find Plate.
The plate handler arm lowers upon the plate.
Confirm the following:
♦ The plate is in the middle of the gripper span
♦ The plate sensor switch is contacting the plate
♦ The gripper does not contact the side of the stack
9 Click Close Gripper.
The gripper grips the plate between its fingers.
10 Select Vertical Home.
The plate handler raises the arm to its highest position. If the plate contacts the
sides of the stack, re-adjust the rotary position of the plate handler arm until the
plate moves freely in the stack.
Note Contact between the plate and the stack or all stacks may be unavoidable.
However, try to minimize the contact as much as possible.
11 Using the Vertical Positioning commands, raise and lower plate handler arm several
times to check the alignment.
12 Lower the plate handler arm and click Rotary Offset, and click Yes.
The software records the rotary position for position 0 (the output stack).
System Maintenance 7-37