Manual 04176
ProAct II Actuator/Driver
Woodward
17
The adjustment of the system position feedback potentiometers does
not affect the positioning of the actuator relative to the position input
signal, or the response of the actuator to the position input signal.
Reconnect the actuator drive wires.
Actuator Travel
The driver's Gain and Offset adjustments normally don't need to be changed
unless you experience difficulty getting the actuator to travel full stroke. If the
characteristic falls outside the tolerance limits, adjust Position Command Gain
and Offset as required to get the characteristic midway between the tolerance
limits (see Figure 2-7 for adjustment locations).
To set up the driver and actuator, 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.
Vary the signal into the position input to the driver and observe actuator angle.
Adjust the Position Command Gain and Offset potentiometers to achieve the
desired relationship (see Figure 2-7). Failure to make this adjustment correctly
may result in the inability to shut off fuel or the inability to reach full-fuel position.
After this adjustment is made, re-install linkage, coupling, etc., to the engine.
This procedure must be repeated whenever the actuator or driver is changed.
The Gain and Offset pots are both located on the printed circuit board inside the
driver box.
The actuator position feedback sensor is factory set and should not be adjusted.
