![]() This deviation of actual value from the desired value in the PID control algorithm causes to produce the output to the actuator (here it is a heater) depending on the combination of proportional, integral and derivative responses. Assume that the measured temperature from the sensor is 50 degree centigrade, (which is nothing but a process variable) but the temperature set point is 80 degree centigrade. ![]() Suppose the process has to be maintained at 80 degree centigrade, and then the set point is 80 degree centigrade. ![]() In order to measure the process variable (i.e., temperature), a sensor is used (let us say an RTD).Ī set point is the desired response of the process. ![]() Assume that the process variable is temperature (in centigrade). It also accepts the desired actuator output, which is referred as set variable, and then it calculates and combines the proportional, integral and derivative responses to compute the output for the actuator.Ĭonsider the typical control system shown in above figure in which the process variable of a process has to be maintained at a particular level. It gets the input parameter from the sensor which is referred as actual process variable. These three basic coefficients are varied in each PID controller for specific application in order to get optimal response. A combination of proportional, integral and derivative actions is more commonly referred as PID action and hence the name, PID (Proportional-Integral-Derivative) controller. ![]()
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