852 HEIDENHAIN Technical Manual iTNC 530 HSCI
Active damping of
low-frequency
oscillations
The active damping of low-frequency oscillations is suitable for damping noise
oscillations of approx. 10 to 30 Hz. The damping factor is set in MP2607.x, and
the damping time constant in MP2608.x. It can be calculated according to the
following formula:
k: Factor from 0.8 to 1.0
f: Frequency to be damped (approx. 10 Hz < f < 30 Hz)
Activating the active damping:
Ascertain the deepest resonant frequency (e.g. with the frequency diagram
in TNCopt when adjusting the IPC and k
V
factor).
Set MP2607.x = 1.5.
Calculate the damping time constant according to the above formula with k
= 0.9, and enter this value in MP2608.x.
Record I (n int) or s diff with the integrated oscilloscope, and move the
axis with the axis-direction buttons.
Vary the value of k up and down somewhat (between 0.8 and 1.0), calculate
MP2608.x, and compare the oscilloscope recordings in order to find the
correct value for MP2608.x (the value with the lowest amplitude).
Vary MP2607.x, and compare with the recordings in the frequency diagram
in TNCopt for the adjustment of the IPC and k
V
factor.
Select the value for MP2607.x by evaluating the advantages and
disadvantages of the active damping.
MP2607.x Damping factor for active damping
Input: 0 to 30.000
0: No damping
1.5: Typical damping factor
MP2608.x Damping time constant for active damping
Input: 0 to 0.9999 [s]
0: No damping
0.005 to 0.02: Typical damping time constant
MP2608.x
k
2 π f⋅⋅
-----------------
=
The active damping should only be used if improvements actually occur,
since the damping could also lead to lower and higher frequencies being
fortified.
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