5.10 Axis Error Compensation
297
5.10.4 Compensation of Thermal Expansion
The parameter object CfgAxisComp is not required for:
Virtual axes (MP_axisMode=Virtual)
Axes that are for display only (MP_axisMode=Display)
To compensate thermal expansion, exact measurements of machine thermal
behavior as a function of temperature (e.g., the center of axis expansion, the
amount of the expansion) are necessary. Since the thermal expansion of the
axes is largely proportional to the temperature, you can determine the amount
of expansion by multiplying the temperature value by a certain factor.
The temperature values measured by the Pt100 thermistors are transferred
using Module 9003. Module 9231 activates the compensation for thermal
expansion according to the lag tracking method.
Compensation:
Activate the general compensation procedures with
MP_active=ON
.
Transfer the distance to be compensated to module 9231. At the same
time, “lag tracking” becomes active. This means that the actual position is
offset by a certain value per PLC cycle until the complete value is compen-
sated.
Define the amount of compensation per PLC cycle for lagged-tracking axis
error compensation in MP_tempCompensation.
For gantry axes, the compensation value must be transferred separately for
each axis.
Thermal compensation when using tilting axes is compensated via machine
parameters.
Settings in the configuration editor:
System
PLC
CfgPlcPeriphery
tempCompensation
Axes
ParameterSets
Key for parameter set
CfgAxisComp
active
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