hi
im new on deltav
I want to create by deltav7.4 a simple system of pressure regulation
the regulator has a fixed setpoint (4bar), reads the signal pressure transmitter then develops a signal
to control a regulator valve
but the problem that I don't know the dynamic of valve or its transfer function
so how do I adjust the parameters of regulator ?
Hi,
It might be important to know those valus... I´ve never had to use them.
The best thing if possible? you test the loop with direct PID control and see what happens, if good then OK otherwise you could add a Signal Characterizer (SGCR) block before the output to give a correcting signal to the valve "nonlinear curve".
"The Signal Characterizer (SGCR) function block characterizes or approximates any function that defines an input/output relationship. The function is defined by configuring as many as twenty X,Y coordinates. The block interpolates an output value for a given input value using the curve defined by the configured coordinates. Two separate analog input signals can be processed simultaneously to give two corresponding separate output values using the same defined curve.
The Signal Characterizer function block supports signal status propagation. There are no standard alarms in this function block. Custom alarms are supported.
The Signal Characterizer function block correlates the input IN_1 to the output OUT_1 and the input IN_2 to the output OUT_2 according to the configured curve. You configure the curve by defining as many as twenty pairs of X,Y values in the CURVE_X and CURVE_Y parameters. The CURVE_X array defines the input values (X1 to X21) and the CURVE_Y array defines the output values (Y1 to Y21).
"
Niklas Flykt
Klinkmann Oy
Key Account Manager safety products
nikfly@gmail.com