Derivative Smoothing (PID)

The derivative calculation is enhanced by a derivative smoothing filter. This first order, low pass, digital filter minimizes large derivative term spikes caused by noise in the PV. This smoothing becomes more aggressive with larger values of derivative gain. You can disable derivative smoothing if your process requires very large values of derivative gain (Kd > 10, for example).
To disable derivative smoothing:
  • Select
    No derivative smoothing
     on the
    Configuration
    tab, or set the .NDF bit in the PID structure.
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