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XPS-Q8 Controller
;--- Driver command interface parameters
MotorDriverInterface=AnalogSin120AccelerationLMI
ScalingAcceleration=30641;--- units / s²
AccelerationLimit=27856;--- units / s²
MagneticTrackPeriod=24;--- units
InitializationAccelerationLevel=20;--- percent
InitializationCycleDuration=5;--- seconds
With the LMI setting, during initialization, the motor is energized and the stage moves
to the closest stable magnetic position. The result is a quick motion of the stage at most
by half of the length of the magnetic track. This behavior might be undesired, but
provides a more failure proof method for initialization than the default initialization
process, which applies only very small oscillations to the stage during initialization.
4.9.3
Gantries with linear motors and variable force ratio
For XY gantries, where the two X-axes are driven by linear motors (meaning driven in
acceleration mode), it is also possible to apply a variable force ratio for the two X axes
positioners. This variable force ratio accounts for the different forces required by the
primary and the secondary X-axes positioner depending on the position of the Y axis.
When correctly set, it ensures a torque-free acceleration and deceleration of the X-axis,
see picture below for illustration.
To apply a variable load ratio to an XY gantry, check the box "Use a force ratio" during
the group definition. See example below. There are three parameters to input:
• Y Offset for force ratio
• Primary Y Motor Force Ratio
• Secondary Y Motor Force Ratio
A correct definition of these three parameters is not simple. For additional information
about this function, please call Newport.
47
XPSDocumentation V1.4.x (EDH0301En1060 — 10/17)
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