Technical Specifications

621
Setup Wizard
Wizard Step 3
When selected, you can perform a Travel Calibration. To determine valve position, the
positioner must measure the closed and open positions of the valve. The SVI2 first exhausts
the actuator and measure the position, then fills the actuator and measure the position.
From these measurements the valve position can be determined.
Wizard Step
4
When selected, you can perform an Autotune. The SVI2 positioner is PID servo control device
with special parameters unique to valve positioners. Because the SVI2 can be put on a wide
variety of valves, the values of the parameters must be changed to match each valve.
The SVI2 can determine a good set of parameters automatically. When the Auto Tune
procedure is run, the SVI2 performs a series of open and closed loop tests to determine
values for P, I, D, Padjust, Beta, Position Compensation, and DeadZone.
The values determined should give good general operation of the valve; however these
values are determined by a target set of performance criteria built into the SVI2. You may
want performance different than this set and may therefore want to set the PID values
differently than determined by Auto Tune. This can be done on the “Calibrate Tab” on
page 634.
Additionally, you can enter the expected Supply Pressure.
Wizard Step
5
Click and when Setup Wizard completes a report of settings appears using the selection
made in Report
Setup .