Settpunkt

Settpunkt is the target value that a control system aims to maintain for a process variable. In a closed-loop system, a sensor measures the actual value, the difference between the measured value and the settpunkt (the error) is used by a controller to adjust an actuator, steering the process toward the desired condition.

Settpunkt can be fixed for steady operation or change over time according to a schedule or external commands. In temperature control, the settpunkt may be 22 degrees Celsius during the day and lower at night; in speed control, the desired speed is the settpunkt. The term is commonly used in control engineering across various domains, including thermal processing, HVAC, motor control, and chemical processes.

Implementation typically relies on a feedback controller such as a PID controller, an on/off controller, or more advanced strategies. The aim is to minimize the error and compensate for disturbances, measurement noise, and actuator limitations. Setpoints may be static or dynamic, with techniques such as setpoint scheduling or ramping used to avoid shocks to the system or to match changing operating conditions.

Management considerations include sensor accuracy and drift, delays, and disturbances that can cause deviation from the settpunkt. Design features such as deadbands, anti-windup mechanisms, and safety limits help maintain stable operation and protect equipment. In advanced control, setpoints may be predicted or optimized by model predictive control or adaptive schemes, enabling the system to respond proactively to changing requirements. Terminology wise, settpunkt is used in some languages for the target value, with the English equivalent being setpoint.