U511 User’s Manual Parameters
Version 1.1 Aerotech, Inc. 4-21
4.5.6. “Enable MFO in freerun” (y/n)
The UNIDEX 511 may be equipped with an external Manual Feedrate Override (MFO)
potentiometer. This parameter is used to enable or disable this potentiometer’s effect when
the associated axis is in freerun.
This parameter value can be set to either yes or no. Descriptions are given in Table 4-13.
Table 4-13. Settings for Parameter x14
Param # Axis # Description
x14 1, 2, 3, 4 Yes - MFO potentiometer is enabled when the associated
axis is in freerun (default)
No - MFO potentiometer is disabled when the associated
axis is in freerun
4.5.7. “Enable axis calibration” (y/n)
Axis calibration is an option available to the UNIDEX 511 user. A maximum of 2,047
points of correction data is available. These points are loaded to the DSP during
initialization from a calibration (.CAL) file. Subsequent axis positioning is then adjusted
based on the .CAL file data.
The table format is the number of absolute machine steps needed to correct the current
position. Feedback polarity is always increasing for CW rotation and decreasing for
CCW rotation. Correction numbers should be entered accordingly, regardless of home
direction and programmed polarity. Correction can be positive or negative.
Axis calibration is repeating. A move outside the calibration window will be mapped
back into the table. If this operation is undesirable, the end of the calibration file should
be "padded" with the last error. In the case of circular calibration, the calibration table
should equal one revolution.
Axis calibration will be active when:
• The “Enable axis calibration” parameter (x15) is set to "yes"
• The ASCII calibration file (.CAL) is present and specified in parameter number
602
• The axis has been homed
A sample of the ASCII file format for the calibration file is shown in Figure 4-1.
Axis calibration is enabled by axis parameter x15. Refer to Table 4-14. Sample
calibration data are listed in Table 4-15.
x14
x15
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