Tuning Page
Tuning page (figure 40) is displayed by clicking the Tuning Tab in SVI Calibration window. This page
allows the user to examine position controller parameters and tune the positioner automatically or manu-
ally. The user can also open the valve position control loop and manually set an output to the internal
I/P in SVI to adjust the bias.
Tune Positioner
In SVI, there is a self-tuning algorithm called Auto Tune which will determine the parameters for valve
positioning control. You can manually adjust these parameters based on the Autotune results or based
on trial and error method. The Step Profile test available from diagnostic mode is useful to tune the
positioner and check its performance.
Clicking the Auto Tune button starts the procedure to automatically determine the positioner tuning
parameters. To run Auto Tune smoothly and successfully, it is important to place the valve between 10
to 90% (preferably 50%) in manual mode and wait until the position matches its setpoint within 0.2%
54
Autotune moves the valve over its entire stroke.
Isolate the valve from the process prior to
Autotune.
WARNING
Figure 40. SVI
Calibration - Tuning
Window
