How should this step-controlled operation be modified?
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How should this step-controlled operation be modified?
This is quite simple; you can use mathematical formulas to convert pressure into valve opening degree, and then the output will be L
It is not recommended to perform split control at the valves; it is better to do so in the DCS, using standard valve positioners. The DCS output can be based on what was mentioned on the 2nd floor.
I’ve never used segmented charts; using a line chart is the simplest way
Yeah, simplifying complex problems: lol
1. The diagram above is a control schematic of the process, rather than a valve position diagram of the configuration； 2. Linearize the pressure range on the X-axis to the output of the controller PIC11150, which is a positive-action controller. See the figure for details ； 3. It is not recommended to use separate control for the three valves, as valves A\B\C require different speeds for opening and closing; valve A operates within a normal control range, with pressure stabilization being the primary goal ； B/C should primarily enable rapid drainage, and when manual control is required, it is difficult for operators to determine the opening degree of each valve. It is recommended to use a single loop for A, with BC subjected to split-range control
Generally, DCS systems have range division modules; by using these modules, it is possible to determine the corresponding relationship between inputs and outputs
I don’t think this is a PID controller; it’s simply such that the valve opening is set to the value corresponding to the process pressure !
I think we can use process pressure to create a line graph, and then correspond it to each valve. There are 3 such lines in total; the first one is y=0.4x