The Boundary Control Strategy

 

Boundary Control was developed as a solution for long-term process functions that are difficult to control using PID, such as those with slow response times. In many instances, loops with slow response times are now being controlled with Model Based Control, rather than Boundary Control.

With boundary control, defined boundaries are used to determine when adjustments should be made. When the PV stays within the upper and lower boundaries, no adjustments are made. It is only when the PV trends outside the boundaries that action is taken.

When tuning a boundary loop, users are able to adjust the following parameters:

Master Setpoint

Control/Boundary Limits

• Output Limits

• Flow Amount - the amount of fuel that shall be adjusted when the loop trends outside of the boundaries

• Adjustment Time/Reset - the amount of time to wait after the boundary line has been crossed before making an adjustment to the fuel setpoint

Maximum Adjustment - the allowed amount of addition or subtraction from the fuel setpoint
Alarm Setpoints - the temperature setpoints for high and low absolute and deviation alarms

• Deadband - the temperature range through which the temperature can vary without initiating an alarm
 
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