Applications Guide Tracer Graphical Programming - Trane
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Applications Guide Tracer Graphical Programming - Trane

Applications Guide Tracer Graphical Programming - Trane Applications Guide Tracer Graphical Programming - Trane

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28.09.2014 Views

® Chapter 4 Cooling tower with two-speed fan example Figure 70: Using Wireless connection block 9. Under Block, click the Read (Use) option to use a Wireless connection block. 10. Under Use, in the Name list, click SumpTemp. 11. Click OK. The Wireless read block appears in the design space (Figure 71). Figure 71: Wireless read Adding the other input blocks Add the remaining input blocks needed for the sump heater module. To add the input blocks: 1. Place a Variable block in the design space and assign the analog variable Sump Heater Setpoint (sourced from the operator display/service tool) to it. 2. In the alarms module, create a Wireless write block, name it OutdoorAirTemp, and connect it to the Outdoor Air Temp input block. 3. Place a Constant block in the design space and assign the value 2.0 to it to represent a 2.0°F deadband. 4. Place another Constant block in the design space and assign the value32.0toittorepresentthefreezingpoint(Figure72onpage69). 68 CNT-APG001-EN

® Writing the sump heater module Figure 72: Input blocks for sump heater module Figure 73: Output block for sump heater module Adding the output block ◆ Place an Output (Hardware) block in the design space and assign the binary output, Sump Heater, to it as shown in Figure 73. Controlling the sump heater under normal conditions Use the Deadband block to control the sump heater under normal conditions. To control the sump heater under normal conditions: 1. Place a Deadband block in the design space and set it to assume heating. Chooseassumeheatingbecauseyouwanttheheatertocomeonifthe Sump Temp falls below the Sump Heater Setpoint (40°F). You want the heater to stay on until the Sump Temp rises to the Sump Heater Setpoint plus the deadband constant (2.0°F). 2. Connect the SumpTemp wireless read block to the Input port of the Deadband block. 3. Connect the Sump Heater Setpoint variable block to the Setpoint port of the Deadband block. CNT-APG001-EN 69

®<br />

Writing the sump heater module<br />

Figure 72: Input blocks for sump heater module<br />

Figure 73: Output block for sump heater module<br />

Adding the output block<br />

◆<br />

Place an Output (Hardware) block in the design space and assign the<br />

binary output, Sump Heater, to it as shown in Figure 73.<br />

Controlling the sump heater under normal conditions<br />

Use the Deadband block to control the sump heater under normal conditions.<br />

To control the sump heater under normal conditions:<br />

1. Place a Deadband block in the design space and set it to assume heating.<br />

Chooseassumeheatingbecauseyouwanttheheatertocomeonifthe<br />

Sump Temp falls below the Sump Heater Setpoint (40°F). You want<br />

the heater to stay on until the Sump Temp rises to the Sump Heater<br />

Setpoint plus the deadband constant (2.0°F).<br />

2. Connect the SumpTemp wireless read block to the Input port of the<br />

Deadband block.<br />

3. Connect the Sump Heater Setpoint variable block to the Setpoint port<br />

of the Deadband block.<br />

CNT-APG001-EN 69

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