Yokogawa YVP20S - Manual (Page 74)

8-5
IM 21B04C50-01E
<Toc> <Ind> <8. SETUP WIZARD>
8.4 Travel Calibration Wizard
The mechanical stops on some actuators may allow the valve to move beyond its rated
travel. The next wizard allows adjustment of the valve travel to correspond to the travel
indicator on the actuator. In the example shown the valve has been moved to 100% travel
mark on the actuator by trial and error. The YVP positioner indicates that the position
corresponding to 100% rated travel is 93.5% of the measured mechanical travel. If this is
correct, select the span calibration and click Apply Calibration. Click yes to the confirmation
dialog “Are you sure you want to apply travel calibration?” The same method can also be
used to adjust the 0% position to correspond to the valve’s actual closed position. It may
also be used to correct non-linear travel by adjusting the position at which the valve is 50%
open.
Figure 8.7 Travel Calibration Wizard
NOTE
Before running the Travel Calibration Wizard, check that the Tight shut Off and Full Open
Features, and the Position Limits are disabled. Click next to see the Position Control limits
Wizard (Figure 8.7), then click Back to return to Travel Calibration. If it is necessary to make
changes, click next to Finish the Wizard and install the changes. Then, restart the Setup
Wizard.