Help, is the control valve malfunctioning?
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In the converter, there is a plug valve; when no operation is being performed, the valve position signal increases by 10% before returning to its normal level. Other process parameters also change as a result. I would like to know where to start in order to find out the cause of this issue Positioner Rotork 3300, Zhejiang University DCS
1. Check the action trend of the process control valves to determine whether the process is in operation. 2. If it is an automatic circuit, you are likely referring to a temperature control valve; check whether temperature fluctuations are causing the valve to operate. 3. If the action time is very short, check whether there is any change in wind pressure ； Whether the air source is free of water contamination. 4. Verify that no one at the site has touched the valve, especially the feedback rod area, and check whether the feedback rod is securely fixed. 5. Examine the service life of the locator to determine if there is any aging of the circuit board or instability in its output. Please refer to this.
It is recommended to check whether there is any looseness or similar issues with the machinery. It’s hard to explain the problems after recovery. For reference.
It’s difficult to determine the situation again; there’s a high possibility of an issue with the air supply system
1. Check the AO trend; if there is no change in the AO output, it indicates that the issue lies outside the cabinet, such as wiring interference, on-site positioners, pneumatic actuators, air supply, etc； 2. If AO is in output mode, check how it outputs and the operation records; if automatic mode was selected at that time, there will be no operation records. It is also necessary to check whether someone changed the operation mode. In such cases, this change only occurs when the mode is switched from manual to automatic – it depends on the actual situation. If it is indeed in automatic mode, then only the controlled parameters can be checked