Siemens SINUMERIK 840D sl Function Manual page 344

Compensations (K3)
5.2 Temperature compensation
Specify parameters
The temperature compensation parameters must now be set on the basis of the
measurement results (see diagram above).
Reference position P
As the diagram above illustrates, there are basically two methods of configuring reference
position P
1. P
2. P
In our example, variant 2 is chosen, where the position-independent temperature
compensation value is always 0. The temperature compensation value therefore only
consists of the position-dependent component.
The following parameters result:
● MD32750 $MA_TEMP_COMP_TYPE = 2
● P
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:
Figure 5-4
Depending on the resulting line, the following dependency on T results for the coefficient
tanβ:
tanβ(T) = (T - T
With
T = temperature at which position-dependent error = 0; [degrees]
0
344
0
:
0
= 0 with position-independent temperature compensation value K
0
≠ 0 with position-independent temperature compensation value K
0
(only position-dependent temperature compensation active)
= 320 mm → SD43920 $SA_TEMP_COMP_REF_POSITION = 320
0
(reference position for position-dependent temperature compensation)
Characteristic of coefficient tanβ as a function of measured temperature T
) * TK * 10
0 max
/ (T T )
-6
max - 0
_ 0
0
≠ 0
0
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions