1128 HEIDENHAIN Technical Manual MANUALplus 620
Ascertaining the
initial values
(standard setting)
1. Ascertain the machine frequency
With the nominal position value filters you limit the bandwidth of the given
nominal value. To do so, you have to enter the cutoff frequency of the machine
in MP_frequency. The following guideline explains how to determine the
machine frequency.
Prepare measurement:
Preferably select the advanced HSC filter for the measurement:
MP_shape = AdvancedHSC
Define a start value for the tolerance:
MP_pathTolerance = 0.02
Define a start value for the filter cutoff frequency:
MP_frequency = 50
If required, limit the cutoff frequency step by step (this increases the filter
damping) until the oscillation is reduced.
Carry out the adjustment with a suitable NC program. The TNCopt software
from HEIDENHAIN features the "FF_100_[axis].h" NC programs for
feedforward adjustment.
With the integrated oscilloscope, record the signals v nom, v act and the
following error (servo lag) s-diff.
Proceed as follows to ascertain the resonance frequency of the machine:
Increase the jerk for the measurement to achieve a more intensive machine
excitation.
MP_axTransJerk: Set a very high value
Observe the oscillation of the following error in the constant speed range.
Determine the amplitude duration of the oscillation and calculate the
resonance frequency of the axis from it.
Compare the frequencies of the individual axes.
Select the lowest frequency of all linear axes for the default setting of the
position filter (defaultPosition).
Reset the parameters to the original values at the end of the measurement!
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