Woodward ProAct III, Инструкция по установке и эксплуатации

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Manual 04127 ProAct III/IV Actuator/Driver
Woodward 17
Figure 3-5. ProAct Driver Adjustment Locations
Actuator Travel
The driver's span and offset adjustments normally don't need to be changed
unless you experience difficulty getting the actuator to travel full stroke. The
following graphs define the relationship between command signal (0–200 mA or
4–20 mA) and actuator position. If the characteristic falls outside of the tolerance
limits, adjust span and offset as required with the goal to get the characteristic
midway between the tolerance limits.
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 current into the mA input to the driver and observe actuator angle.
Adjust span and offset to achieve the desired relationship (see Figure 3-6).
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 Offset and Range pots are both located on the printed circuit board inside
the driver box. The Offset and Range pots are each 25-turn. Both turn clockwise
to increase the position of the actuator output for a given input to the driver. See
Chapter 2 for the adjustment procedure.