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78 UDC3200 Universal Digital Controller Operator Manual 04/08
controller will control at the local setpoint using these newly calculated tuning
constants.
4.6 Fuzzy Overshoot Suppression
Introduction
Fuzzy Overshoot Suppression minimizes Process Variable overshoot following a
setpoint change or a process disturbance. This is especially useful in processes which
experience load changes or where even a small overshoot beyond the setpoint may
result in damage or lost product.
How it works
The Fuzzy Logic in the controller observes the speed and direction of the PV signal as
it approaches the setpoint and temporarily modifies the internal controller response
action as necessary to avoid an overshoot. There is no change to the PID algorithm,
and the fuzzy logic does not alter the PID tuning parameters. This feature can be
independently Enabled or Disabled as required by the application to work with the
Accutune algorithm. Fuzzy Tune should not be enabled for processes that have an
appreciable amount of deadtime.
Configuration
To configure this item, refer to Section 3 - Configuration:
Set Up Group “ACCUTUNE”
Function Prompt “FUZZY”
Select “ENABLE” or “DISABLE” - Use or .