January 2012 6.16 The Control Loop 821
When selecting the limit frequencies (parameters MP_filter1LimitFreq and
MP_filter2LimitFreq) for mean-value filters and triangle filters, take into
account the lowest resonant frequency of your machine’s axes and the
desired damping at this frequency. If the limit frequency is set to 0, the filter
is switched off.
MP_filter1LimitFreq and MP_filter2LimitFreq have no significance for the
Triangle and Average filter types. You can switch off these filters only if you
enter the value Off in MP_filter1Shape and MP_filter2Shape.
With the parameters MP_filter1Shape and MP_filter2Shape, select from
the mean-value and triangle filters the nominal position value filters for the
Program Run, Single Block, Program Run, Full Sequence and Positioning
with Manual Data Input operating modes. The triangle filter (triangle)
smoothes the contour towards the inside at changes in direction. This
results in an excellent surface quality without overshoot. The mean-value
filter (average) is a very smooth filter with low edge steepness, which
should be used only for testing, and not for machining.
With the parameter MP_manualFilterOrder, select the order of the
mean-value filter for the Manual, Electronic Handwheel, Jog Increment and
Pass Over Reference Point operating modes.
In order to achieve the optimum results for your machine or application, test
the various filter settings with a test part consisting of short, straight paths.
The tolerance (MP_pathTolerance) always refers to the nominal value,
meaning the servo lag also affects the contour accuracy.
For example, if the servo lag S = 5 µm and the tolerance T = 10 µm, then
the total deviation is 15 µm.
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