![]() If a difference is detected a correction is calculated and applied. ![]() The output of a device or process, such as a heater, is measured and compared with the target or set point. Even though many controllers provide auto tune capabilities, an understanding of PID tuning will help in achieving optimal performance. This White Paper from OMEGA Engineering discusses how to tune a PID controller. The process of finding these values is referred to as “tuning.” When tuned optimally, a PID temperature controller minimizes deviation from the set point, and responds to disturbances or set point changes quickly but with minimal overshoot. ![]() Although simple in concept, the mathematics underpinning PID control is complex and achieving optimal performance entails selecting process-specific values for a range of interacting parameters. Any disturbance, such as when a product is added or withdrawn or a ramp function is applied, must be handled appropriately. To ensure consistent product quality the temperature inside an oven or furnace must be kept within narrow limits. Heat treatment processes exemplify the need for PID control.
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