Siemens SINUMERIK 840D sl Function Manual page 352

Compensations (K3)
5.4 Interpolatory compensation
Logging
Compensation tables are not saved with the series commissioning file.
To archive compensation tables, they must be output via the serial interface on the PCU.
The following compensation types can be selected for archiving in the operating area
"Services", "Data OUT":
● LEC/measuring system error compensation (%_N_AX_EEC_INI)
● Sag/angularity compensation (%_N_AX_CEC_INI)
● Quadrant error compensation (%_N_AX_QEC_INI)
Compensation tables can also be saved as an archive file with HMI Advanced.
Linear interpolation between interpolation points
The traversing path to be compensated delineated by the start and end positions is divided
up into several (number depends on error curve shape) path segments of equal size (see
diagram below). The actual positions that limit these sub-paths are referred to as
"interpolation points" below. A compensation value must be entered for each interpolation
point (actual position) during commissioning. The compensation value applied between 2
interpolation points is generated on the basis of linear interpolation using the compensation
values for the adjacent interpolation points (i.e. adjacent interpolation points are linked along
a line).
Figure 5-7
Compensation value at reference point
The compensation table should be structured such that the compensation value at the
reference point is "zero".
352
Linear interpolation between the interpolation points
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions