Axis 7100 Installation Guide Page 281

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ADT Model 7100 Semi-Automatic Dicing System Operations Manual
Open Loop Theta Accuracy Procedures
P/N 97100-9002-000-14 Ver 06/05
8.4-1
8.4 Open Loop Theta Accuracy Procedures
8.4.1 Stress Release
This function, when enabled, serves to follow the Theta axis motions and
detect when the Theta axis exceeds the defined limits (see below). If the
Theta axis exceeds one of these limits, the system performs back and forth
movement between the defined Theta Stress Release Left and Right
coordinate points (see below) before any angle move or alignment. For
instance, if the alignment procedure takes place for the first time after the
Theta initiation (i.e. the Theta axis reaches the 0 degrees, which is less
than Theta Stress Right Crd), the axis moves back and forth a number of
times.
Changing the Theta Align Stress Enable parameter from "No" to "Yes"
enables the following parameters:
Theta Stress Move Delay - pause between the Theta movements
while performing the Stress Release.
Theta Stress Right Limit - the right-most point of the Theta
axis motion. In case the Theta axis moves beyond this limit, the
system performs Stress Release. This parameter value should be
less than that of Theta Stress Right Crd. The default value for
this parameter is 20 degrees.
Theta Stress Left Limit - the left-most point of the Theta axis
motion. In case the Theta axis moves beyond this limit, the system
performs Stress Release. This parameter value should be greater
than that of Theta Stress Left Crd. The default value for this
parameter is 160 degrees.
Theta Stress Right Crd (coordinate) - the right-most point of the
process. The default value for this parameter is 40 degrees.
Theta Stress Left Crd (coordinate) - the left-most point of the
process. The default value for this parameter is 140 degrees.
Theta Number of SR Repetitions - number of times the Theta
axis moves between the left and right coordinates while
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