Loops
Loop Setup
Revision 9 900 Control Station User Guide 151
May 2014
Item Description
Local % CO* Lets you adjust % Carbon measurement to compensate for variations in the
amount of CO in the carrier gas.
Remote % CO* % Carbon measurement from the function block input within the configuration.
* Visibility depends on loop type.
TIP
• The controller will ignore entry of Local Setpoint if tracking is on and if the loop is
in Manual mode.
• Ratio Bias is enterable only if it is configured for local bias. It is read-only if it is
configured for remote bias.
Loop Tuning
This display lets you set up and start the loop Accutune III tuning function. When initiated, the controller
will start controlling to the setpoint while it identifies the process, calculates the tuning constants, and
begins loop control with the correct tuning parameters.
Item Description
Tuning Status Inactive – The Accutune III tuning process is not active.
Tuning – The Accutune III tuning progress is active.
Fuzzy Overshoot Select ON to activate Fuzzy Overshoot Suppression to minimize overshoot after a
setpoint change or a process disturbance.
Select OFF to disable Fuzzy Logic.
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 Item can be independently
Enabled or Disabled as required by the application to work with “TUNE” On-Demand
tuning.
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