9-1
Chapter 9 Using PID Control for Constant Flow / Pressure
Applications
9.1 What is PID Control?
The PID function in the inverter can be used to maintain a constant process variable such as pressure,
flow, temperature by regulating the output frequency (motor speed). A feedback device (transducer)
signal is used to compare the actual process variable to a specified setpoint. The difference between
the set-point and feedback signal is called the error signal.
The PID control tries to minimize this error to maintain a constant process variable by regulating the
output frequency (motor speed).
The amplitude of the error can be adjusted with the Proportional Gain parameter 10-05 and is directly
related to the output of the PID controller, so the larger gain the larger the output correction.
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