ProAct I/II
Manual 04121
38
Woodward
Gas Engine Setup
Change in the butterfly valve position is not linear in comparison to engine power
output. In naturally-aspirated (non-turbocharged) engines, the position of the
valve in comparison to engine output appears on a chart similar to Figure 4-3.
Figure 4-3. Non-linear Valve Power Curve
Turbocharged engines distort this curve, particularly as turbo pressure builds to
the point of operating the waste gate. A turbocharged gas engine will likely have
a butterfly position chart similar to Figure 4-4.
Figure 4-4. Sample Engine Plot
Note in both charts that valve position falls on a curve. The ProAct menu does
not permit the construction of a curve. However, with four slope segments
available, a rough approximation of the curve can be created (see Figure 4-5).
Summary of Contents for ProAct I
Page 10: ...ProAct I II Manual 04121 8 Woodward Figure 1 3 Example of ProAct II Actuator...
Page 11: ...Manual 04121 ProAct I II Woodward 9 Figure 1 4 Outline Drawing of ProAct I or II Actuator...
Page 12: ...ProAct I II Manual 04121 10 Woodward Figure 1 5 ProAct Wiring Diagram...
Page 13: ...Manual 04121 ProAct I II Woodward 11 Figure 1 6 Outline Drawing of ProAct Control Box...
Page 39: ...Manual 04121 ProAct I II Woodward 37 Figure 4 2 Typical Transient Response Curves...
