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CNT-APG002-EN, PID Control manual
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70 pages, 910.28 Kb
Applications Guide
PID Control
in T
racer Controllers
CNT-APG002-EN
October 2001
®
Contents
Main
Page
Page
Contents
Chapter 1 Overview of PID control. . . . . . . . . . . . . . . . . . . . . . 1
Chapter 2 PID settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Chapter 3 Programming PID loops. . . . . . . . . . . . . . . . . . . . . 23
Page
Chapter 1
Overview of PID control
What PID loops do
How PID loops work
PID calculations
Proportional calculation
Integral calculation
Derivative calculation
Page
Velocity model
Page
Chapter 2
PID settings
Throttling range
Gains
Calculating the gains
Example
Sampling frequency
Page
Calculating the sampling frequency
To calculate the sampling frequency:
Page
Example
Action
Direct action
Reverse action
Determining the action
Example 1
Example 2
Error deadband
Typical applications
Adjusting error deadband for modulating outputs
IMPORTANT
Adjusting error deadband for staged outputs
To adjust the error deadband for staged outputs:
Other PID settings
Page
Chapter 3
Programming PID loops
Programming in PCL
Follow these steps to program PID loops in PCL:
Page
Programming in TGP
Follow these steps to program PID loops in TGP:
Page
Chapter 4
Applications
Discharge-air temperature control
Page
Page
Building pressure control
Page
Cascade controlfirst stage
Page
Page
Staging cooling-tower fans
Setting up the PID loop
Page
Page
Page
Page
Determining the staging points
To determine the staging points:
Example 1: Two-stage fan system
Example 2: Three-stage fan system
Chapter 5
Troubleshooting
Troubleshooting procedure
Tips for specific problems
Changing the sampling frequency
Changing the gains
Examples
Example 1
Example 2
Page
Example 3
Chapter 6
Frequently asked questions
Why is the derivative gain usually zero?
What is the difference between direct acting and reverse acting?
When should I use proportional-only control?
Why should I use PID control in staging applications?
How can I tell if a PID loop is working well?
Whats the best sampling frequency?
Do I need to worry about the throttling range?
Page
Appendix A
The math behind PID loops
Velocity model formula
Proportional control formula
Page
Glossary
Page
Page
Page
Index
Numerics
A
B
C
E
F
G
H
I
S
T
U
V
W
