Lenze ETC Motion Control - Manual (Page 211)

Machine constants
Configuration of axes − Controller settings
MK_T2
4
4.9
4.9.1
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211 EDSTCXN EN 2.0
4.9 Configuration of axes − Controller settings
4.9.1 MK_T2
This machine constant is the filter time constant for the fine interpolation
filter in seconds. This MC does not affect the position control directly, but the
fine interpolation by means of which new position setpoints are calculated
in the fine interpolation grid (MK_FIT_PRO_GIT). The fine interpolation filter
is a filter of the 2nd order which can be used to smooth the calculated
position setpoints to ensure that specific axes move more smoothly. This MC
also affects axes with a digital interface.
The fine interpolation filter causes a time delay with regard to the output of
the position setpoints. This delay is approx. twice as long as the filter time
constant. Therefore, the same filter time constant should always be entered
for axes which are included in one path interpolation.
This MC is set to 0 by default and should only be increased if an axis tends to
oscillate in the case of discontinuities on the path, e.g. at transitions from
one radius to another radius. This affects mainly axes that have a great
reverse backlash and toothed racks. Reasonable values range between 0 and
0.2 s. The higher the set value, the greater the path deviation which is caused
by the filter.