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Electronic Positioner Principle of Operation

"Positioner is none other than a controller but positioner is specifically design for control valve just like the VFD is specifically design for the pump. Cascade control means the control involving one Master Controller and slave controller. The Master Controller output provides the setpoint to the input of the Slave Controller. Inside the positioner itself, there is master and slave controllers. The external controller such as PLC will provide command signal (control signal or setpoint) to the input of postioner which is master controller input (travel position controller). This control valve travel position setpoint will be compared to the process variable (PV) feedback from the travel sensor (potentiometer or LVDT) which is usually located in the positioner nearer to the valve feedback arm. The input error (deviation) will be fed to the PI controller for processing. Then, the PI controller output will provide the pressure setpoint to the slave controller (PID controller). This pressure setpoint will then be compared to the process variable (PV) feedback from the output pressure sensor which is usually located inside the positioner. The input error (deviation) will be fed to the PID controller (pressure controller) for processing. Then, the Pressure controller will output drive signal to I/P transducer. I/P transducer will convert current to pneumatic pressure and this output pneumatic pressure (MV or manipulating variable) will be fed to the actuator of the control valve. This will then cause the valve stem to move and the travel distance will be detected by travel sensor either via the linkage travel arm or via the magnetic array method." This channel shares a series of hands-on, simulated as well as conceptual knowledge videos about Instrumentation calibration and troubleshooting based on my actual working experience as an ordinary technician. The approach taken mimics the real life experience that occurs in factory setting. I really wish my humble and little unknown videos will at least help those who wish to learn about process instruments. Please kindly help to click "Like" and "Subscribe" buttons to support my effort as the task of making videos are tedious and time consuming. I would like to take this opportunity to sincerely thank everyone for supporting my effort. "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Fluke Digital 789 Multimeter : https://bit.ly/3Qp2Waf Disclaimer: This video description contains affiliate links, which means that if you click on one of the product links, I may receive a small commission. This helps support the channel and allows me to continue creating videos like this. Please note that the product price remains the same whether you purchase it directly from the owner or purchase it via my link shown above. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ " #Instrumentation #Electrical&Instrument #Calibration #CalibrationTechnician #InstrumentTechnician #InstrumentCalTech