Applications Guide Tracer Graphical Programming - Trane

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Chapter 5
Cooling tower with variablespeed
fan example
In this chapter, you will build upon the cooling tower program that you
constructed in Chapter 4. Some changes to the cooling tower that you
must accommodate in your program include a variable-speed fan (instead
of a two-speed fan) and calculation of some critical performance parameters
for the cooling tower.
Note:
Many of the chapters in this book build on previous chapters, so
be sure to complete the chapters in the order presented. See
“About this book” on page 1 for additional instructions.
What you will learn
In this chapter, you will learn a variety of skills, concepts, and definitions.
Skills
You will learn how to interpret increasingly complex sequences of operation.
Concepts and definitions
You will understand Calculation blocks.
Blocks
You will learn how to use the following blocks:
• Output Status
• Subtract
• Wet-Bulb
• Min
• Max
• Limit
• PID
• Feedback Alarm
• Not
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