Siemens SINUMERIK 840D sl Function Manual page 359

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
T
max
TK
max
Therefore, based on the values from the above diagram:
T = 23°
0
T
max
TK
max
and tanß (T) is therefore:
tanβ(T) = (T - 23 degrees) * 14.21 [µm/1000 mm]
Example:
At a temperature of T = 32.3 degrees, therefore: tanβ = 0.000132
PLC user program
The formula given above must be used in the PLC user program to calculate the coefficient
tanβ (T) which corresponds to the measured temperature; this must then be written to the
following NCK setting data:
SD43910 $SA_TEMP_COMP_SLOPE
(gradient for position-dependent temperaturecompensation)
According to the example above:
SD43910 $SA_TEMP_COMP_SLOPE = 0.000132
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Characteristic of coefficient tanβ as a function of measured temperature T
) * TK * 10
0 max
= maximum measured temperature; [degrees]
= temperature coefficient at T
= 42°
= 270 µm/1000 mm
/ (T T )
-6
max - 0
; [µm/1000 mm]
max
Compensations (K3)
Temperature compensation
359