The output from the PLC side of the control valve is opposite to the actual valve opening – what should be done?
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The control valve is from Wuxi KOSO, and the positioner is from ABB, model V18348. How can this be modified so that the PLC can communicate with the field equipment? Thank you very much
First, it is necessary to determine which side’s output is opposite to the actual valve opening, whether it is the PLC side or the field side. Then make adjustments according to different situations. If the output from the PLC is in the opposite direction to the actual valve opening, it is possible to consider reversing the control of the output signal within the PLC program; this can be achieved by modifying the logic in the PLC program. If the output from the field side is opposite to the field opening, it is possible to adjust the parameters in the locator; for specific methods, refer to the manual for ABB V18348. Furthermore, if the installation position of the control valve is incorrect, it can also result in the on-site opening degree being opposite to the output, requiring correction of the valve’s installation. In short, it is necessary to analyze the causes of the problem in detail and make corresponding adjustments based on the actual situation, so as to ensure that the PLC output matches the actual valve opening on site. It is recommended to seek technical support from professionals. .
Use the locator manual to adjust the orientation of the locator