Woodward ProAct I, Product Manual

Page: 43 / 67

Manual 04121 ProAct I/II
Woodward 41
2. Set Gain A to the value recorded in Step 1b. This should give good control
at no load.
3.
Use the plot of the engine to determine the linearity of the fuel system. This
curve should be linearized between inflection points as shown in Figure 4-5.
4.
Set the Gain A Breakpoint for the actuator output at or slightly below the
value at the first inflection point. The gain of the electronics is constant for
actuator outputs less than the Gain A Breakpoint.
5.
Set the Gain B Breakpoint at the point slightly above the first inflection point
in the actuator output versus load plot.
6.
Gain B should now be adjusted to obtain good control at the inflection point.
Note: you may already have obtained the correct value in Step 1c.
7.
Set the Gain C Breakpoint slightly below the next inflection point in the curve
obtained in 1d.
8.
Gain C should now be adjusted to obtain best control at this point. Note: the
correct value for Gain C may already have been obtained in Step 1c for this
load.
9.
Gain D breakpoint is normally higher than the second inflection point. The
gain of the control is constant after this point.
10. Gain D is adjusted for the best response at full load. This value may also
have been determined in Step 1c.
Figure 4-6. Example of Plot Created
from GAIN Column
Figure 4-7. Example of Plot Created
from ACTUATOR OUTPUT Column