
3. αiS/αiF/βiS SERIES PARAMETER ADJUSTMENT B-65270EN/05
- 76 -
Wide
Under 10dB
Under -20dB
Tuning Navigator shows bode-plot of velocity loop and you can
check the performance of velocity loop.
Upper line in bode-plot shows gain characteristic and lower line
shows phase characteristic. Important points of this figure that
you should note are as follows. (About the details of bode-plot,
please refer to several books of basic control method)
• The width of 0dB level of gain line is important. By setting
higher velocity loop gain, it becomes wide.
• Gain level of resonance frequency has to be suppressed at
least under -10dB.
• Gain level around cut-off frequency is less than 10dB.
• Gain level near 1000Hz has to be lower than -20dB.
<2> Filter Tuning
Next, select Filter Tuning from Tuning Navigator to adjust the
resonance elimination filter to suppress machine resonance.
Following example shows that gain line at two resonance
frequencies (250Hz and 530Hz) are suppressed by Filter Tuning.
Under -10dB
<3> Gain Tuning
Finally, select "Gain Tuning". Tuning Navigator decides the final
result of gain tuning. By adjusting the resonance elimination
filter, the influence of machine resonance can be eliminated, so a
high velocity loop gain can be set.