Seek help to convert the manual valves of workshop equipment to an automatic control system. . .
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In my workshop’s combustion furnace, the pipelines for hydrogen and nitrogen are both under manual control. If the pressure in the hydrogen pipeline falls below the specified value, it is necessary to manually close each hydrogen valve one by one and open the nitrogen valves. For the current technical upgrade, it is necessary to make this process automatically controlled; that is, when the hydrogen pressure drops, the valve closes automatically, and the nitrogen valve opens automatically. Once the hydrogen level returned to normal, the process was reversed. I would like to ask everyone, what kind of system or equipment is needed to implement this process? Thank you all.
Pressure sensors are installed on each of the two pipelines, the valves are replaced with automatic valves, and control is achieved through PLC programming
Hello, is it complicated to modify it? Does PLC control have corresponding measures for sudden shutdowns, stops, and restarts? It also needs to be set, right?
1. Install pressure transmitters that meet the process requirements at appropriate locations along the hydrogen pipeline, and fit appropriate types of automated control on/off valves on this pipeline; the fail-safe position for such valves should be closed, with position feedback available. 2. Install appropriate types of automated control on/off valves on the nitrogen pipeline as well; the fail-safe position for these valves can be either closed or open. You know better than I do, but it’s better to have position feedback as well. 3. A small PLC system shall be used for system control: the low limit value from the hydrogen pressure transmitter shall serve as the signal to shut off hydrogen and turn on nitrogen, while the high limit value shall serve as the signal to shut off nitrogen and turn on hydrogen. 4. If manual control is needed for system maintenance, a small touch screen should be installed. 5. If communication with a higher-level control system is required, the PLC system should be equipped with a field communication module, such as PROFIBUS-DP
It’s very simple; even digital displays can achieve this
Controlling with the high/low limit alarm outputs of a digital display has its limitations. If it is required to turn off the position confirmation and multi-valve sequence control switches, then other methods will be needed