HEIDENHAIN MANUALplus 620 Technical Manual page 721

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6.10.4 Compensation of thermal expansion

January 2012

Settings in the configuration editor

CfgPlcPeriphery

tempCompensation

ParameterSets

[Key name of the parameter set]

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 (see

"MP_active" on page 706).

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

compensated.

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

MP_tempCompensation

Compensation of thermal expansion

Available from NCK software version: 597 110-01.

Numerical value

0.0000 to 359999.6400 [mm/min]

0 = Compensation not active

6.10 Axis Error Compensation