![]() ![]() The below table shows the PID controller selection based on Process Reaction rate, dead time and load changes. It is also useful in preventing overshoot of the process variable in the start-up of batch processes. ![]() Rate action can be very useful in minimizing overshooting of the process variable when the controller is trying to compensate for large or rapid load changes. Proportional plus Integral and Derivative It can be used even when process capacitance is small and load changes are large. The primary advantage of proportional-plus-reset is that it will eliminate offset with load changes. It does a particularly good job when process capacitance is large and dead time small Proportional plus Integral Proportional control reduces cycling below that of ON-OFF control. In general it functions satisfactorily if the process has a large capacitance and minimum dead time Proportional A brief tutorial on PID controller selection guide based on Process reaction rate, Dead time and Load changes.It is a complex process to choose the proper mode of control to use on a particular process. Tuning NI LabVIEW and PID Summary References Control System The basic idea behind a PID controller is to read a sensor, then compute the desired actuator output by calculatingproportional, integral, and derivative responses and summing those three components to compute the output. ![]()
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