Zhejiang University Zhongkong DCS regarding automatic temperature control issues
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Current process requirements: The chemical reaction should cause a rise in temperature on its own within half an hour, with the temperature to be controlled using cooling water – for example, it should be kept below 50 degrees within 10 minutes, below 60 degrees within 20 minutes, and below 70 degrees within 30 minutes. After half an hour, heating should begin, with the temperature rising by 3 degrees every 10 minutes; during this process, there is also a slight increase in temperature due to the reaction. Can this be stabilized? How to write a program
Single-loop PID control: simply use a timer to adjust the input of the set value according to your desired timing
You can use gradient control to regulate the temperature, or employ a combination of multiple PID controllers based on the actual conditions
This can also be achieved using sequential control; if one is not able to do it themselves, the control requirements can be provided to the central control unit, along with the existing configuration, and after it’s prepared, it can be installed and tested by the relevant party. Save the previous configuration properly, and develop the habit of backing it up before making any changes to it.
After using the central control system for some time, it was difficult to regulate the temperature. It was said that adjusting the PID parameters could achieve the desired result, but this required a lot of trial and error. Moreover, even after the equipment had been running for a long time, the PID parameters still needed to be adjusted.
Just use the RAMP function