HEIDENHAIN iTNC 530 HSCI - Cutoff Freq. for Nominal Position Value Filters;Filters of Rotary Axes; HSC Filter (MP1212); Tips for Setting the Nominal Position Value Filter

826 HEIDENHAIN Technical Manual iTNC 530 HSCI
Tips for setting the
nominal position
value filter
HSC filter (MP1212)
The HSC filter can be used to limit the bandwidth of the nominal command
value. The corresponding limit frequency is entered in MP1212 for this.
If the HSC filter is used with limit frequencies less than 30 Hz, then ensure that
the path jerk (MP1090) in dependency of the limit frequency is not set to too
large a value. Otherwise, overshoots at the corners could exceed the
prescribed tolerances. Independently of this, MP1090 should always be set in
a manner such that the following error does not become too large during the
jerk phase.
In order to maintain the accuracy at HSC frequencies under 30 Hz, the
following table should also be considered:
If the HSC filter does not need to be used to limit the bandwidth, very brief
machining times can be achieved by setting high limit frequencies with high
jerk values. Of course, requirements for this are increased jerk (MP1232.x,
MP1242.x, MP1250.x) and acceleration values (MP1060, MP1070) since
starting at certain limit frequencies, the jerk and acceleration values
increasingly limit the feed rate. The machining time is briefest at a certain
value in MP1212. The following rule of thumb is used to find the optimum
value:
MP1212 = 23 + MP1232 *0.2 (however, MP1212 should be ≥ 30)
If the tolerance is increased, the optimum value for MP1212 is shifted to
smaller frequencies.
Cutoff frequency for
nominal position
value filters or
filters of rotary axes
Machine parameters MP1218.0 to .2 can be used to allow higher machining
speeds in the rotary axes if Cycle 32 with a small angle tolerance (required for
toroidal cutters, for example) is used. This also permits an axis-specific
configuration with differing drive designs of the rotary axes. Cutoff
frequencies for separate nominal-value filters for the A, B and C axes can be
entered in these parameters. The filter type is the same as that for the linear
axes (MP 1200).
If 0 (default value) is entered, the 32nd-order triangle filter is used for this axis
(as before for all rotary axes).
CC 6xxx controller
unit
Frequency to be damped [Hz]
MP1212 10 12.5 15 17.5 20 22.5 25 27.5
Max. path jerk for
tolerance = 5 µm
18 18 18 18 23 45 90 150
Max. path jerk for
tolerance = 10 µm
30 36 36 36 45 100 150 –
Max. path jerk for
tolerance = 20 µm
45 45 64 68 90 180 – –