sandip B patel Posted November 29, 2019 Report Share Posted November 29, 2019 Dear Sir I am using unistream PLC with analogue module wbc1 and i am reading 4 - 20 mA with respect to pressure 0 - 225 bar but reading pressure is delay and pressure going overflow up to 10 bar i set noice reduction is 50 hz and sw sooming is none so please suggest me how to reduce is problem waiting for reply Quote Link to comment Share on other sites More sharing options...
sandip B patel Posted January 1, 2020 Author Report Share Posted January 1, 2020 reply sir Quote Link to comment Share on other sites More sharing options...
MVP 2022 Joe Tauser Posted January 1, 2020 MVP 2022 Report Share Posted January 1, 2020 On 11/29/2019 at 6:23 AM, sandip B patel said: but reading pressure is delay and pressure going overflow up to 10 bar Please elaborate - if you monitor the pressure online it lags the actual pressure? How can you tell and how much is it delayed? Joe T. Quote Link to comment Share on other sites More sharing options...
sandip B patel Posted January 3, 2020 Author Report Share Posted January 3, 2020 dear sair, For Example , when i stop Pressure valve at 80 bar in manual mode ,the pressure in HMI is going up to 90 bar and also in analogue pressure gauge so please give the best solution for it. Quote Link to comment Share on other sites More sharing options...
MVP 2022 Joe Tauser Posted January 3, 2020 MVP 2022 Report Share Posted January 3, 2020 So what you're saying is the process pressure keeps rising after you shut the valve. Like its got a spring in it. I don't think this is a PLC problem, as the HMI and the gauge agree. If you observe the process when the valve closes, does the gauge say 80 or 90? What's probably happening is you have some stored energy in the system somewhere in the form of an air bubble or the valve isn't closing quickly enough to clamp the pressure at the setpoint you want. Without being there to look at it I can only guess. If the overshoot is always 10 bar or it's predictably linear in some way, I'd modify the logic to shut the valve sooner based on actual observed (empirical) process data. Joe T. Quote Link to comment Share on other sites More sharing options...
sandip B patel Posted January 10, 2020 Author Report Share Posted January 10, 2020 Dear Sir thank for reply Quote Link to comment Share on other sites More sharing options...
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