Helpful pid relay for High-Risk Applications
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pid relay output
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Non-parametric Tuning of PID Controllers: A Modified Relay-Feedback-Test Approach (Advances in Industrial Control)
The relay feedback test (RFT) has become a popular and efficient in process identification and automatic controller tuning. Non-parametric Tuning of PID Controllers couples new modifications of classical RFT with application-specific optimal tuning rules to form a non-parametric method of test-and-tuning. Test and tuning are coordinated through a set of common parameters so that a PID controller can obtain the desired gain or phase margins in a system exactly, even with unknown process dynamics. The concept of process-specific optimal tuning rules in the nonparametric setup, with corresponding tuning rules for flow, level pressure, and temperature control loops is presented in the text.
Common problems of tuning accuracy based on parametric and non-parametric approaches are addressed. In addition, the text treats the parametric approach to tuning based on the modified RFT approach and the exact model of oscillations in the system under test using the locus of a perturbedrelay system (LPRS) method. Industrial loop tuning for distributed control systems using modified RFT is also described. Many of the problems of tuning rules optimization and identification with modified RFT are accompanied by MATLAB® code, downloadable from http://extras.springer.com/978-1-4471-4464-9 to allow the reader to duplicate the results.
Non-parametric Tuning of PID Controllers is written for readers with previous knowledge of linear control and will be of interest to academic control researchers and graduate students and to practitioners working in a variety of chemical- mechanical- and process-engineering-related industries.
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I'm looking to make a homemade sous vide machine. Any help is appreciated.
And got the following answer:
The controller typically has a number of relay terminals, one for heating and occasionally one for cooling, each with NC and NO contacts. The NO terminals for the heating output normally go in series with the heater; however, it is possible that the controller cannot handle the load of your heater. If this is the case you will need a larger relay or a solid-state relay with sufficient current rating for your heating element. The solid state relay may require a voltage source as well; try to find one with simple closure contacts for the control element. There is another set of contacts for a thermistor, thermocouple, or current/voltage feedback. You would connect these to a sensor that is located as close as possible to the food. For a sous vide machine, this might be a probe that extends into the middle of the tank. Feel free to add more details if I can help more.
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