[Daily Question 20090318] Describe how to improve the adjustment quality of the adjustment system from the perspective of measurement and transmission instruments?
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How to improve the adjustment quality of the adjustment system from the perspective of measurement and transmission instruments? Summarize: 1. Correctly select the range and zero point of the transmitter. 2. Reduce measurement error: 1) Reduce the additional error caused by the connection between the measuring element and the transmitter. For resistance thermometers, a three-wire connection method is used, and the compensation wire must be correctly selected for thermocouples. 2) Reduce the noise interference mixed into the transmission signal lines, separate strong current and weak current signal lines, separate power lines from signal lines, use shielded wires, and conduct reasonable grounding, etc. 3) Reasonably choose the location of the measuring point. 3. Use the compensation method to overcome the nonlinear errors of measuring components. For example, thermocouples and zirconia detection components have nonlinear errors, and the compensation method can be used to linearize them. 4. To reduce the measurement lag, a differentiator can be connected in series after the transmitter, or a differential-first regulator can be used. For pneumatic instruments, if the pipeline is long, a pneumatic relay can be added to increase the transmission power of the pneumatic signal and reduce the signal transmission lag. 5. Reduce signal fluctuations. This post was last edited by Mobei Yihai on 2009-3-18 19:36 ]
The basic regulating loop is a feedback regulating system composed of measuring components (transmitters), regulators, regulating objects, and regulating valves (actuators). Adjustment is to adjust the difference between measurement and given value. Improving the measurement accuracy and stability of the detection component (transmitter) can improve the adjustment quality of the system. In addition, it should also be considered whether the adjustment object is reasonably determined, whether the PID parameter setting of the regulator is reasonable, and the selection of the regulating valve will have an impact on the quality of adjustment.
The basic regulating loop is a feedback regulating system composed of measuring components (transmitters), regulators, regulating objects, and regulating valves (actuators). Adjustment is to adjust the difference between measurement and given value. Improving the measurement accuracy and stability of the detection component (transmitter) can improve the adjustment quality of the system. In addition, it should also be considered whether the adjustment object is reasonably determined, whether the PID parameter setting of the regulator is reasonable, and the selection of the regulating valve will have an impact on the quality of adjustment.
The basic regulating loop is a feedback regulating system composed of measuring components (transmitters), regulators, regulating objects, and regulating valves (actuators). Adjustment is to adjust the difference between measurement and given value. Improving the measurement accuracy and stability of the detection component (transmitter) can improve the adjustment quality of the system. In addition, it should also be considered whether the adjustment object is reasonably determined, whether the PID parameter setting of the regulator is reasonable, and the selection of the regulating valve will have an impact on the quality of adjustment.
Correct installation method and improving the measurement accuracy and stability of the detection component (transmitter) can improve the adjustment quality of the system.
1. The selection of control quantity instruments must be appropriate, and the accuracy must meet the control requirements. The installation complies with specifications. 2. The selection of the actuator (regulating valve) must also be appropriate, and its control constant should be about 60% of its regulating capacity. ； 3. The control method of the controller should be selected appropriately, the setting parameters should be appropriate, and the control accuracy should also meet the process requirements.
1. The sensor + transmitter is like the human eye. The measurement accuracy and stability must meet the requirements. 2. The control algorithm is like the human brain. The optimized algorithm can improve the control accuracy, improve the stability and responsiveness of the system. 3. The actuator is like the human hand, it must be sensitive and flexible.