K3: Compensations
4.3 Backlash compensation
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
231
T
max
= maximum measured temperature; [degrees]
TK
max
= temperature coefficient at T
max
; [µm/1000 mm]
Therefore, based on the values from the above diagram:
T
0
= 23°
T
max
= 42°
TK
max
= 270 µm/1000 mm
and tanß (T) is therefore:
tanβ(T) = (T - 23) [degrees] * 270 [µm/1000 mm] * 10
-6
/ (42 - 23) [degrees]
= (T - 23) [degrees] * 14.21 [µm/1000 mm] * 10
-6
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 temperature
compensation)
According to the example above:
SD43910 $SA_TEMP_COMP_SLOPE = 0.000132
4.3 Backlash compensation
4.3.1 Mechanical backlash compensation
4.3.1.1 Description of functions
Mechanical backlash
When force is transmitted between a moving machine part and its drive (e.g. ball screw),
there is normally a small amount of backlash because adjusting mechanical parts so that
they are completely free of backlash would result in too much wear and tear on the machine.
Thus, backlash (play) can occur between the machine component and the measuring
system.
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