Using the PID block
CNT-SVP01C-EN 97
Using the PID block
A proportional, integral, derivative (PID) loop control is an automatic con-
trol system that calculates how far a measured variable is from its set-
point and controls an output to move the measured variable toward the
setpoint. The loop performs PID calculations to determine how aggres-
sively to change the output.
In the HVAC industry, PID loops are used to control modulating devices
such as valves and dampers. Some common applications include:
• Temperature control
• Humidity control
• Duct static pressure control
• Staging applications
For a more in-depth discussion of PID control, see the PID Control in
Tracer Controllers applications guide (CNT-APG002-EN).
Setting up the PID block properties
To set up the PID block properties:
1. From the Blocks menu, choose Calculation. From the Calculation
menu, choose PID.
2. Click in the design space to place the PID block (Figure 69).
Figure 69. PID block
3. Double-click the PID block. The PID Properties dialog box appears
(Figure 70 on page 98).
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