Honeywell UDC2500 - Manual (Page 124)

Monitoring and Operating the Controller
110 UDC2500 Universal Digital Controller Product Manual 4/07
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.
4.12 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 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 “TUNE” (On-Demand) Accutune
III tuning algorithm.
Configuration
To configure this item, refer to Section 3 - Configuration:
Set Up Group “ATUNE”
Function Prompt “FUZZY”
Select “ENAB”(enable) or “DIS” (disable) - Use
or .
4.13 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. (Does not apply for Duplex control.)
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.