Pressure control single-loop failure
Thread Content
In the single-loop control of pressure in the PKS system, when the process is set to automatic mode, if the measured value PV exceeds the range, the control panel displays NAN; in that case, is the valve output OP equal to 0?
Not necessarily; it depends on whether the valve operates in a direct or reverse manner
The valve’s fault condition is FC closed, with a reactive effect
As the PV value increases, is the valve open or gradually closing?
The OP of the valve will be zero; other problems may also occur if the displayed value is too high