HEIDENHAIN MANUALPLUS 620 - 6.20.6 Configuring the nominal position value filter and look-ahead parameters

1124 HEIDENHAIN Technical Manual MANUALplus 620
6.20.6 Configuring the nominal position value filter and look-ahead parameters
The nominal position value filters smooth the NC path so that a higher
traversing speed is possible and oscillations are dampened. This path
smoothing leads to a deviation from the programmed positions. By reducing
the feed rate at corners and curvatures, the MANUALplus 620 always keeps
this deviation within the specified tolerance.
You can display the filter effects in the integrated oscilloscope:
Values before filtering: Signal IpoDbg with:
ch = 36
idx = [axis index from MP_axisList]
bit = 0
Values after filtering: Signal s-nom
Types of filters Four filters are available for limiting the bandwidth of the dynamics of nominal
position and speed values.
 Average (mean-value) filter
1
 Triangle filter (also: single filter)
 HSC filter
 Advanced HSC filter
Default filter and
axis-specific filters
As of NCK software version 597 110-05, all filters are set system-wide via the
CfgFilter config object (default filter). If you want to activate another filter for
a specific axis, you can overwrite the default configuration axis-specifically via
the CfgPositionFilter configuration object.
Note
The following description of the configuration of the nominal position value
filters and the look-ahead is valid as of NCK software version 597 110-05
(milestone 5).
1. The average filter is (almost) never used in practice. You should also consider
that the shape of the filter causes, for example at corners, a relatively strong
jerk on the axes.
Note
For axes that are interpolated together, you should define different filters
only in exceptional cases. It leads to distortions of the nominal path!