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Differential factor
Low-pass filter
6 – 136
The differential factor can reduce low-frequency oscillations. However, it
increases oscillations in the high frequency range.
7 7 7 7
In MP2520.x, enter a differential factor.
Note
Ensure that the system is stable enough!
The differential factor is not recommended on machines with motors that
have belt couplings. The influence of aging and temperature is too great.
Estimating the differential factor:
MP2520.x: Differential factor of the speed controller [As
MP2500.x: Proportional factor of the speed controller
T: Period of the lowest interference frequency [s]
MP2520.0-8 Differential factor of the speed controller for axes 1 to 8
Input:
0 to 1.0000 [As
With the low-pass filter you can damp high frequency oscillations
(> approx. 600 Hz):
7 7 7 7
Use the oscilloscope to find the fundamental frequency of the TNC.
7 7 7 7
Activate the 1st or 2nd order low-pass filter (see table).
Fundamental frequency of the
interference oscillation
600 Hz to 700 Hz (approx.)
> 700 Hz (approx.)
If you cannot achieve satisfactory results with the low-pass filter, try the PT
element.
MP2560.0-8 Low-pass filter for axes 1 to 9
Input:
0: No low-pass filter
1: 1st-order low-pass filter
2: 2nd-order low-pass filter
⋅
T MP2500.x
------------------------- -
≈
MP2520.x
8
2
]
Filter order (MP2560.x)
1st order (MP2560.x = 1)
2nd order (MP2560.x = 2)
HEIDENHAIN Technical Manual TNC 426, TNC 430
2
]
2
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