Manual 26727
VariStroke-I (VS-I) Electro-hydraulic Actuator
Woodward
71
Immediately after this, the VS-I servo valve will slightly open in the opposite direction to slowly move the
actuator toward the maximum position. The actuator will move a small distance off the minimum stop,
pause for a brief moment to determine an acceptable slew rate, and then continue to move toward the
maximum position. Once a physical stop is contacted, the servo valve will close and the VS-I will
automatically configure this as the maximum (20 mA demand) position. These limits of travel are
automatically scaled to 4 mA (minimum) to
20 mA (maximum) demand levels.
Press the “Find Minimum AND Maximum Stops” button. A confirmation screen will appear with two
buttons “Find Minimum AND Maximum Stops” and Cancel. Once the “Find Minimum AND Maximum
Stops” button has been pressed the calibration cycle will start and the following screen will appear. To
cancel the Find Minimum AND Maximum Stops sequence and return to the previous screen press
“Cancel”.
Actuator movement can be monitored and viewed using the trend chart. To do so, press “Start” at the top
left corner of the trend chart.
Figure 5-6. Calibration in Progress Screen
Released