Honeywell UDC3200 series, Product Manual

Page: 128 / 243

Monitoring and Operating the Controller
Completing Accutune
When Accutune is complete, the calculated tuning parameters are stored in their proper
memory location and can be viewed in the TUNING Set up Group, and the controller
will control at the local setpoint using these newly calculated tuning constants.
4.11 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 .
4.12 Using Two Sets of Tuning Constants
Introduction
You can use two sets of tuning constants for single output types and choose the way they
are to be switched. (this does not apply for Duplex control, which always uses two PID
sets).
The sets can be:
•
keyboard selected,
•
automatically switched when a predetermined process variable value is reached,
•
automatically switched when a predetermined setpoint value is reached.
116 UDC3200 Universal Digital Controller Product Manual 12/04