6-25
·Suppression of Short-cycle Vibration
Vibrationwith a wavelengthalmost as long as the differential time results from exces-
sive derivative (D) control. The vibration can be suppressed by setting the derivative
(D) time to a smaller value.
If the vibration cannot be suppressed after the differential time is set to 0.00, set the
proportional gain to a smaller value or the PID primary delay time constant to a larger
value.
Response
Before fine tuning
After fine tuning
Time
Advanced Operation Chapter 6
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