Applications Guide Tracer Graphical Programming - Trane
Applications Guide Tracer Graphical Programming - Trane Applications Guide Tracer Graphical Programming - Trane
® Chapter 4 Cooling tower with two-speed fan example Determining a programming approach Dividing the sequence of operation into logical program modules makes programming easier. In a single program, you can write several program modules. This sequence can be subdivided into the following four modules: • Alarms • Sump heater • Cooling tower fan • Condenser water pump (Assume for this chapter that the chiller does this.) Programming tip: When possible, subdivide graphical programs according to the sequence of operation. Doing so makes the program easier to read and understand. Setting the program properties Set the program properties as shown in Figure 49 on page 53. Set the program run frequency to 30 seconds, which is appropriate for this cooling tower application. 52 CNT-APG001-EN
® Writing the alarms module Figure 49: Cooling tower with two-speed fan drive program properties Writing the alarms module Start by compiling the alarms requirements from the various parts of the sequence of operation, including the following: • If the condenser water pump fails, indicate a general alarm. A user must be able to reset the alarm at the operator display. • If the sump temperature remains below 36°F (this value is adjustable at the operator display) for 15 minutes, or if the sump temperature falls below 32°F, indicate an alarm at the operator display and turn on the Alarm output. • Indicate an alarm when any temperature sensor fails. These temperatures include Sump Temp, Supply Temp, and the Outdoor Air Temp inputs. • Alarms must be resettable at the operator display. Note the following important points and questions about the alarm control requirements: • The pump failure is determined by another part of the program. The alarms module merely uses the result. CNT-APG001-EN 53
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®<br />
Chapter 4 Cooling tower with two-speed fan example<br />
Determining a programming approach<br />
Dividing the sequence of operation into logical program modules makes<br />
programming easier. In a single program, you can write several program<br />
modules. This sequence can be subdivided into the following four modules:<br />
• Alarms<br />
• Sump heater<br />
• Cooling tower fan<br />
• Condenser water pump (Assume for this chapter that the chiller does<br />
this.)<br />
<strong>Programming</strong> tip:<br />
When possible, subdivide graphical programs according to the<br />
sequence of operation. Doing so makes the program easier to<br />
read and understand.<br />
Setting the program properties<br />
Set the program properties as shown in Figure 49 on page 53. Set the program<br />
run frequency to 30 seconds, which is appropriate for this cooling<br />
tower application.<br />
52 CNT-APG001-EN
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