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Parameters for manual-gain tuning mode
Speed loop gain：
Increasing this parameter would improve the bandwidth of speed control loop, but a too large
value would cause the mechanism vibration. Therefore, it is recommended to operate the auto-gain
tuning mode to approximate a proper value at first. If the value could not satisfy the requirement, to
increase this value gradually until the mechanism vibration occurred.
Speed integral gain：
Decreasing this parameter would improve the low-frequency rigidity of speed control loop and
reduce the speed stability errors. On the other hand, a too small value would cause the phase delay to
make an instable system.
Speed feed-forward gain：
The speed feed-forward gain could reduce the phase lag errors, and increase the traceability. If
the setting value is near 1, the dynamic tracking error would be very small and the pre-compensation
will be the most completed. If the setting value is too low, the improvement would not obvious. But a too
high value would cause the system vibration easily.
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