Mach-DSP User’s Manual
Document Number: MACH-DSP-9021
Page 95
www.ScannerMAX.com
N.
Increase the High Frequency Damping control to help eliminate the overshoot that
could not be eliminated using Low Frequency Damping and Position-proportional
gain alone. To decrease the step time (increase servo bandwidth), increase Error
Integral gain, then use Position-proportional gain, Low-Frequency Damping and
High-Frequency Damping to eliminate overshoots, as shown on the Oscilloscope.
PDF tuning requires a great deal of patience and skill, and you will find that the controls
work in non-intuitive ways. You will find that increasing Position-proportional gain is
useful in controlling the first overshoot that occurs after the step. You will also find that
increasing Low-Frequency Damping without a sufficient amount of Position-proportional
gain will actually make overshoots worst.
As was stated at the beginning of Paragraph 10, this manual is not meant to be a
complete guide to scanner tuning – only to familiarize you with some of the controls and
what they do. This section does not cover concepts that may be important, including
setting of one or more Notch filters, found on the Advanced tab.
