Siemens SINUMERIK 840D sl Function Manual page 345

Extended functions
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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, 01/2008, 6FC5397-1BP10-3BA0
= maximum measured temperature; [degrees]
= temperature coefficient at T
= 42°
= 270 µm/1000 mm
; [µm/1000 mm]
max
Compensations (K3)
5.2 Temperature compensation
345

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