Woodward ProAct I, Product Manual

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ProAct I/II Manual 04121
54 Woodward
Problem Cause Remedy
Prime mover
overspeeds only on
starts. Control adjustment. Control may be adjusted for sluggish operation
causing overspeed on start. Slowly adjust GAIN for
fastest stable response. Stability may be adjusted
too low. Increase Stability setting.
Start Fuel Limit may be too high.
Start Ramp may be too high.
Start speed may be too low.
Wrong set of dynamics may have been selected.
Linkage/Coupling. On diesel installations verify that fuel rack is not
binding and linkage is properly adjusted. It may be
necessary to determine if the fuel rack is quickly
following the actuator.
On carburetor installations check that the butterfly is
not binding.
Check linkage or coupling adjustment.
Overspeed Device. Verify proper operation of overspeed protection
devices to determine if a shutdown is occurring
without an overspeed condition.
ProAct control. If the control does not cut back the actuator output
(Menu 5), the ProAct control may be faulty. If the
signal is cut back, look for a problem in the linkage
or actuator.
Prime mover
overspeeds after
operating at rated
speed for some time. Prime mover. Check for proper operation of prime mover fuel
system. If actuator moves toward minimum fuel
during overspeed, problem may not be connected
with the governor.
Speed not regulated
(hunting). Incorrect dynamics
programmed in control or
incorrect dynamics program
selected. Improve dynamics settings or select correct
dynamics program.
Los speed is not
regulated at idle
speed. Actuator and linkage. The Idle Speed setting may be below the minimum-
fuel position of the actuator or prime mover fuel
stop. In this case, the output voltage to the actuator
will be zero.
The engine will be maintained at the minimum-fuel
position by the actuator or the prime mover
minimum-fuel stop. These conditions indicate that
the prime mover minimum-fuel position should be
decreased by linkage adjustment (diesel engine) or
low-idle set screw (gas engine), or the Idle Speed
setting should be raised. If this action does not
correct the problem, the control may be faulty.
Prime mover does not
decelerate when
Rated contact is open. Faulty Rated contact. Check Idle/Rated contact. Remove wire from
terminal 17. Prime mover should decelerate.
ProAct control ramp circuitry. A faulty Rated contact may remain in the accelerate
position with the contact open.
If the Rated contact is operative, loss of idle control
may be due to a faulty circuit.