1134 HEIDENHAIN Technical Manual iTNC 530 HSCI
Setting the filters in
the speed controller
To determine the oscillation frequencies of the speed controller, activate the
Optimization/speed controller step response function in TNCopt.
The oscillation frequencies of the speed controller for linear and torque motors
must be determined at slow feed rate in positive and negative traverse
direction, and at the midpoint and end of the traverse range.
Later you enter the ascertained frequencies, bandwidths and damping in the
corresponding machine parameters (MP2542.x to MP2566.x). Normally no
more than three filters are required.
Experience recommends:
At very small frequencies (< 200 Hz) use no filters
Use very little damping (3 dB to 6 dB) at low frequencies (200 Hz to 400 Hz)
The bandwidth should be approximately at center frequency
Damping values are normally between 3 dB and 18 dB. Damping above
18 dB usually brings no further improvement.
The use of a PT2 filter on linear motors does not bring positive results. For
torque motors it is sometimes necessary to activate a PT2 filter (not below
approx. 400 Hz).
Only use the filters in the speed controller if they are necessary, i.e. if the
P factor can be increased noticeably.
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