PID controlis a feedback control method that combines - TopicsExpress

PID controlis a feedback control method that combines proportional, integral, and derivative actions. The proportional action provides smooth control without hunting. The integral action automatically corrects offset. The derivative action responds quickly to large external disturbances. The PID controller is the most widely used type of process controller. When combined into a single control loop the proportional, integral and derivative modes complement each other to reduce the system error to zero faster than any other controller. Figure 14-19 shows the block diagram of a PID control loop, the operation of which can be summarized as follows: • During setup, the set-point, proportional band, reset (integral), rate (derivative), and output limits are specified. • All these can be changed during operation to tune the process. • The integral term improves accuracy, and the derivative reduces overshoot for transient upsets. • The output can be used to control valve positions, temperature, fl ow metering equipment, and so on.

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