Applications Guide Tracer Graphical Programming - Trane
Applications Guide Tracer Graphical Programming - Trane Applications Guide Tracer Graphical Programming - Trane
® Chapter 5 Cooling tower with variable-speed fan example Table 7: Cooling tower with variable-speed fan drive data definition (continued) Data Type Name Notes Outputs Analog Fan Speed Analog output configured as voltage, 2–10 V Binary Fan Start/Stop Apply sufficient minimum on/off timers to prevent excessive fan cycling. Sump Heater Apply sufficient minimum on/off timers to prevent excessive heater cycling. Pump Start/Stop Apply sufficient minimum on/off timers to prevent excessive pump cycling. Alarm Variables Analog Supply Temp Setpoint Sump Heater Setpoint Sump Alarm Setpoint Delta Temp Wet-Bulb Temp Approach Temp Analog variable, source set to operator display/service tool Analog variable, source set to operator display/service tool Analog variable, source set to operator display/service tool Analog variable, source set to program Analog variable, source set to program Analog variable, source set to program Binary Pump Fail Binary variable, source set to program Alarm Reset Binary variable, source set to operator display/service tool and program* * The binary variable, Alarm Reset, is sourced from both the operator display/service tool and the program. This allows the user to turn on the reset. After the alarm is reset, the program turns the Alarm Reset off. Before you start to write the program, configure these inputs, outputs, and variables in your Tracer MP580. Then open the TGP editor. 82 CNT-APG001-EN
® Reviewing the sequence of operation Figure 85: Cooling tower with variable-speed fan drive wiring diagram CNT-APG001-EN 83
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®<br />
Chapter 5 Cooling tower with variable-speed fan example<br />
Table 7: Cooling tower with variable-speed fan drive data definition (continued)<br />
Data Type Name Notes<br />
Outputs Analog Fan Speed Analog output configured as voltage, 2–10 V<br />
Binary Fan Start/Stop Apply sufficient minimum on/off timers to prevent<br />
excessive fan cycling.<br />
Sump Heater Apply sufficient minimum on/off timers to prevent<br />
excessive heater cycling.<br />
Pump Start/Stop Apply sufficient minimum on/off timers to prevent<br />
excessive pump cycling.<br />
Alarm<br />
Variables Analog Supply Temp<br />
Setpoint<br />
Sump Heater<br />
Setpoint<br />
Sump Alarm<br />
Setpoint<br />
Delta Temp<br />
Wet-Bulb Temp<br />
Approach Temp<br />
Analog variable, source set to operator display/service<br />
tool<br />
Analog variable, source set to operator display/service<br />
tool<br />
Analog variable, source set to operator display/service<br />
tool<br />
Analog variable, source set to program<br />
Analog variable, source set to program<br />
Analog variable, source set to program<br />
Binary Pump Fail Binary variable, source set to program<br />
Alarm Reset Binary variable, source set to operator display/service<br />
tool and program*<br />
* The binary variable, Alarm Reset, is sourced from both the operator display/service tool and the program. This allows the user<br />
to turn on the reset. After the alarm is reset, the program turns the Alarm Reset off.<br />
Before you start to write the program, configure these inputs, outputs,<br />
and variables in your <strong>Tracer</strong> MP580. Then open the TGP editor.<br />
82 CNT-APG001-EN
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