About Tuning a Position Axis -----Control Output oscillate

[mars_bruce_lee]

The axis has started to oscillate,from the Control Output.
See the attachment. That means Proportional Gain is too much or Differential Gain. Is it?

Too much Proportional Gain and Differential Gain Can cause shock。How to distinguish between the two from the plot?

[Jacob_Paso]

I think the problem may be because a deadband exists. Try the Output Deadband.

[CharlesM]

Too much Proportional Gain and Differential Gain Can cause shock。How to distinguish between the two from the plot?

You can add the gain values to the plot to see how they change the output.

[mars_bruce_lee]

@CharlesM

Too much Proportional Gain and Differential Gain Can cause shock。How to distinguish between the two from the plot?

You can add the gain values to the plot to see how they change the output.

thanks ,that’s a good idea.

[mars_bruce_lee]

@Jacob Paso

I think the problem may be because a deadband exists. Try the Output Deadband.

Thanks, The answer is Differential Gain.
When i cancel the Differential Gain. the Control Output dont oscillate.