HEIDENHAIN MANUALplus 620 Technical Manual page 856

Differential factor
856
The step response illustrated above is idealized. In practice, interfering
oscillations are superimposed on the step response.
You can reduce these interference oscillations with the differential factor, the
PT second-order time-delay element, the band rejection filter and the low-
2
pass filter of the speed controller.
The differential factor reduces low-frequency oscillations. However, it
increases the tendency to oscillate in the high frequency range.
 In MP_vCtrlDiffGain, 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:
MP_vCtrlDiffGain
MP_vCtrlDiffGain: Differential factor of the speed controller [As
MP_vCtrlPropGain: Proportional factor of the speed controller
T: Period duration of the lowest disturbance frequency [s]
MP_vCtrlDiffGain
Differential factor of the speed controller
Available from NCK software version: 597 110-01.
Format: Numerical value
Input: 0.000 000 000 to 1 [As
2
Default: 0 [As /rev.]
Access: LEVEL3
Reaction: RUN
⋅
T MP_vCtrlPropGain
≈
------------------------------------------------------------------- -
8
2
/rev.]
HEIDENHAIN Technical Manual MANUALplus 620
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