In Apc Training Presentation

Advanced Process Control Training Presentation Lee Smith March 29, 2006

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Contents

[object Object],[object Object],[object Object],Advanced Process Control

[object Object],[object Object],[object Object],[object Object],Advanced Process Control Key process variables Management Objectives

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],How Can APC Be Used?

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Advantages and Benefits

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Limitations

What is Basic Process Control? ,[object Object],[object Object],House is too cold Furnace Thermostat Controller recognized the house is too cold sends signal to the furnace to turn on and heat the house furnace turns on heats the house Is the house too cold? yes

Basic Control House is too cold Furnace Thermostat Controller recognized the house is too cold sends signal to the furnace to turn on and heat the house furnace turns on heats the house natural gas house temperature measured is temperature below setpoint? setpoint = 72°F Controlled variable: temperature (desired output) Input variable: temperature (measured by thermometer in theromostat) Setpoint: user-defined desired setting (temperature) Manipulated variable: natural gas valve to furnace (subject to control)

[object Object],[object Object],[object Object],Feedback Control Theory

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],PID Control

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Goals of PID Control

PI Control Example I = 1.4 gives the best response: quickly brings controller to setpoint without oscillation

PI Control Example I = 0.6 gives the best response I = 1.1 borders on instability

PID Control Example I = 0.6 gives the best response I = 1.2 & 1.4 unstable

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Limitations of Feedback Control

Feedforward Control Window is open Furnace Feedforward Recognize window is open and house will get cold in the future: Someone reacts and changes controller setpoint to turn on the furnace preemptively. furnace turns on heats the house natural gas house temperature is currently OK turn on furnace Decrease setpoint to turn furnace on Pre-emptive move to prevent house from getting cold

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Feedforward Control

[object Object],[object Object],[object Object],Combined Feedforward/Feedback

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Multivariable Control

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Internal Model-Based Control

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Important Data Issues

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Distillation Tower Example

Distillation Tower APC Results

APC Application in Wafer Fab Source: Carl Fiorletta, “Capabilities and Lessons from 10 Years of APC Success,” Solid State Technology , February 2004, pg 67-70.

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Exercise in PID Control

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Exercise in PID Control

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Summary

Recommended References ,[object Object],[object Object],[object Object],[object Object]

Useful Websites ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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