The control system crashed suddenly
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The oxygen compressor in our company’s 6000 system suddenly stopped operating. All of the automatic control valves in that system switched from automatic to manual mode, and their status changed to yellow. All values related to pressure, resistance, liquid level, flow rate, etc., except for those related to temperature, showed false values that remained constant. What could be the cause of this control issue? How should it be handled?
Check the system hardware and fault diagnosis status as soon as possible; if the control circuit switches back to manual mode, it is usually caused by faulty measurement values.
Check whether the power supply to the distribution cabinet is normal.
It is caused by unstable power supply voltage. I wonder if the owner’s power supply is connected to a UPS; if not, it should be changed as soon as possible.
A new UPS was installed, but the problem persists
Will bad measurement values cause failures at all measurement points except for temperature? I’m from the production department; the instrumentation and control staff are still trying to determine the cause of the fault
Will bad measurement values cause failures at all measurement points except for temperature? I’m from the production department; the instrumentation and control staff are still trying to determine the cause of the fault
Does the 6000 system of your company refer to Nanjing Keyuan NT6000 or some other manufacturer’s product? It is normal for the pressure and flow sensors to report faults and for the control valve to automatically switch to manual mode. Based on your description, the temperature measurement point should not be affected by temperature changes; the problems likely lie with the common components related to pressure, flow rate, and liquid level. There might be an issue with the power supply – is it a four-wire instrument? It would be easier to determine the issue if a more detailed description is provided. As for the constant display of false values, it should be due to a DCS failure.
If the control card is redundant, try forcing a switch to the backup card.
Check whether the CPU is shut down: Reasons for shutdown: power outage, excessive CPU load, bugs in the CPU itself
Thank you all for your concern. With the help of the manufacturer’s staff, the problem has been resolved. It was a hardware issue related to poor grounding, but the grounding wires are in good condition