HEIDENHAIN TNC 430 PA/M - Differential Factor; Low-Pass Filter

6 – 136 HEIDENHAIN Technical Manual TNC 426, TNC 430
Differential factor The differential factor can reduce low-frequency oscillations. However, it
increases oscillations in the high frequency range.
7
77
7 In MP2520.x, enter a differential factor.
Estimating the differential factor:
MP2520.x: Differential factor of the speed controller [As
2
]
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
2
]
Low-pass filter With the low-pass filter you can damp high frequency oscillations
(> approx. 600 Hz):
7
77
7 Use the oscilloscope to find the fundamental frequency of the TNC.
7
77
7 Activate the 1st or 2nd order low-pass filter (see table).
If you cannot achieve satisfactory results with the low-pass filter, try the PT
2
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
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.
MP2520.x
T MP2500.x⋅
8
--------------------------
≈
Fundamental frequency of the
interference oscillation
Filter order (MP2560.x)
600 Hz to 700 Hz (approx.) 1st order (MP2560.x = 1)
> 700 Hz (approx.) 2nd order (MP2560.x = 2)