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Trane CNT-APG002-EN, PID Control manual - page 3

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PID Control in Tracer Controllers

This manual and the information in it are the property of American Standard Inc. and shall not be used or reproduced in whole or in

part, except as intended, without the written permission of American Standard Inc. Since The Trane Company has a policy of continu-

ous product improvement, it reserves the right to change design and specification without notice.

The Trane Company has tested the system described in this manual. However, Trane does not guarantee that the system contains no

errors.

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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