curlyandshemp
Lifetime Supporting Member
plcnovel said:I am sorry guys i got back to this thread very late. Actually i was in the process of getting some data about the valaves Bench settings and Transducers pressure settings. Here are the numbers:
Operating Range (I/P output) 6-30 Psi
Bench setting for the valve 14 - 30 psi
PLC card output (4-20 mA to I/P)
Which means that valve will not start to open until I/P has a pressure around 14 psi(about 9mA output from Output card, 33%). If the I/P operating range is not equal to Valve Bench Settings, experts say we need to add a positioner, What are your comments on it? Also if the positioner is needed, can we eliminate the need of it and work around in our plc logic or output card span to make these I/P/Valves working properly. Thanks a lot for your input
Rescale your analog output so that the minimum value from your PID gives you the ma value to achieve 14psi from the I/P
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