Siemens SINUMERIK 840D sl Function Manual page 257

Figure 5-2
Specifying parameters
The temperature compensation parameters must now be determined on the basis of the
measurement results (see diagram above).
Reference position P
As the diagram above illustrates, there are basically two methods of parameterizing reference
position P
1. P
2. P
In this case, version 2 is chosen, which means that the position-independent temperature
compensation value is always 0. The temperature compensation value therefore only consists
of the position-dependent component.
The following parameters are obtained:
● MD32750 $MA_TEMP_COMP_TYPE = 2
(only position-dependent temperature compensation active)
● P
(reference position for position-dependent temperature compensation)
Coefficient tanβ (T)
In order to determine the dependency of coefficient tanβ of the position-dependent temperature
compensation on the temperature, the error curve gradient is plotted against the measured
temperature:
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Error curves determined for the Z axis
0
:
0
= 0 with position-independent temperature compensation value K
0
≠ 0 with position-independent temperature compensation value K
0
= 320 mm → SD43920 $SA_TEMP_COMP_REF_POSITION = 320
0
K3: Compensations
5.2 Temperature compensation
≠ 0
0
= 0
0
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