Operation
64 UDC2300 Controller Product Manual 12/00
6.8 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 II
tuning algorithm.
Configuration
To configure this item, refer to Section 4 - Configuration:
Set Up Group “ATUNE”
Function Prompt “FUZZY”
Select “ENAB”(enable) or “DIS” (disable) - Use or .
6.9 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.
Set up Procedure
The following procedure (Table 6-11) to:
• select two sets,
• set the switch-over value,
• set tuning constant value for each set.
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