YOKOGAWA F3CU04-0S, User Manual

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C6-11
IM 34M06H62-02E 2nd Edition : June 2008-00
C6.7 “Super” Overshooting Suppression
Function
The “Super” overshooting suppression function uses fuzzy logic to suppress
overshooting. It is particularly effective in the following situations when used together with
the auto-tuning function.
- For suppressing overshooting
- For reducing start-up time
- For handling large load fluctuations
- For handling frequent changes in SP values
The “Super” function is enabled by setting the Super Enable Code (SC) parameter to “1:
Enabled”. When enabled, it monitors the deviation and once it detects the risk of
overshooting, it automatically changes to a somewhat lower virtual control set point
(Supplementary Set Point (SSP)). When the deviation again enters a range where there
is no risk of overshooting, the function reverts little by little to the original set point.
Original CSP
Fuzzy logic begins
Time
Process Value
(PV)
PV
Supplementary set point (SSP)
“Super” is
enabled
Figure C6.11 “Super” Function
Table C6.6 Parameters Related to the “Super” Function
Data Position Number
Symbol Description Unit Data Range
Default
Value
Attribute Stored
Loop1 Loop2 Loop3 Loop4
182 382 582 782 SC “Super” enable code None 0: Disabled; 1: Enabled 0 RW 
- The “Super” function applies only to PID operation. If the Integral Time and
Derivative Time parameters are set to “0: Off”, then the “Super” function will not act
even if the Super Enable Code (SC) parameter is set to “1: Enabled”.
- As the “Super” function requires the PB, TI and TD parameters to be set correctly,
you should set proper PID values using auto-tuning or other means before setting
the Super Enable Code (SC) parameter to “1: Enabled”.