6-22
• Suppression of Short-cycle Vibration
Vibration with a wavelength almost as long as the differential time results from excessive 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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