ProAct II Actuator/Driver
Manual 04176
16
Woodward
Figure 2-7. ProAct Driver Adjustment Locations
Position Feedback Adjustment
The driver's position feedback Gain and Offset adjustments normally don't need
to be changed unless you experience feedback values outside the normal
operating parameters of the driver. If the characteristic falls outside the tolerance
limits, adjust System Position FB Gain and Offset as required to get the
characteristic midway between the tolerance limits (see Figure 2-7 for adjustment
locations).
The procedure for adjusting the system position feedback is as follows.
To set up the driver system feedback, first disconnect the actuator drive wires at
the control (DO NOT disconnect the actuator position feedback wires). Power up
the system with the actuator disconnected from the linkage but with the inertia
disk in place. DO NOT START THE ENGINE AT THIS TIME.
The actuator can be manually moved between minimum and maximum fuel,
based on actuator stops. Adjust the System Position FB (feedback) Gain and
Offset potentiometers until the output at the terminals is within the desired
specification. The nominal voltages are 0.5 V at minimum fuel and 4.5 V at
maximum fuel.
