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8-60
Drive Functions
Determining Start Position
Dependencies of the Actual
Position Value Errors of Thermal
Measured Temperature Value
Reference Temperature
The start position for precision axis error compensation determines the
position of the first correction support point, the end position is determined
by the controller and displayed in P-0-0409, Axis correction end
position.
Control-Side Axis Error Correction
IndraDrive controllers provide the possibility of cyclically sending control-
side correction values for the actual position value to the drive and using it
for calculating the actual position value in the position control clock.
The control-side axis error correction is activated when the parameter
P-0-0400, Axis correction external correction value is available in the
master data telegram. The correction values act on the encoder selected
in parameter P-0-0413, Axis correction control word.
Note:
For control-side axis error correction it is not necessary to
establish the position data reference drive-internally for the
respective encoder!
actual pos. value
external correction value
(P-0-0400)
Fig. 8-42:
Control-side axis error correction
Temperature Correction
The temperature correction is used to correct actual position value errors
that can occur due to temperature-dependent linear expansion at servo
axes.
According to the mechanical configuration of the axis and the
arrangement of the workpiece or tool, the actual position value errors
Cause
caused by the influence of temperature can
• only depend on temperature
- or -
• depend on temperature and on axis position.
IndraDrive controllers therefore provide two possibilities of temperature
correction:
• independent of position
• depending on position
The measured temperature value has to be made cyclically available by
the control master via the master communication! For position-dependent
and position-independent temperature correction the controller accepts its
own measured temperature values!
The temperature-dependent correction functions are working relatively to
a reference temperature at which there isn't any temperature-dependent
actual position value error present. The reference temperature value has
to be entered in parameter P-0-0402, Axis correction reference
temperature.
MPH-02, MPB-02, MPD-02
act. pos. val., corrected
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
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