Figure 5-3. Gain Slope - Woodward 723PLUS Technical Manual

Manual 26482
If operation in this range is satisfactory, no further dynamic adjustments are
necessary. If during changes in load or an actuator bump, excessive speed
errors occur, increase the Gain Slope adjustment until engine performance
is satisfactory. See Figure 5-3.
If excessive actuator movement again occurs, do procedure 4 then repeat
procedure 3. If the settling time after a load change is too long, reduce the
Reset set point slightly and increase the Gain slightly. If slow-speed hunting
occurs after a load change but decreases or stops in time, increase the
Reset set point slightly and reduce the Gain set point.
5. When a significant load change occurs, the control should switch
automatically to a high gain (gain x gain ratio) and reduce the amplitude of
the speed error. Reduce (or increase) the Window Width set point to just
greater than the magnitude of acceptable speed error. A value of Gain Ratio
too high will cause the control to hunt through the low-gain region. This
normally will occur only if the Window Width is too low. If necessary to
decrease the Window Width to control limit cycling (identified by the engine
speed slowly cycling from below to above the speed setting by the amount
of Window Width), the Gain Ratio may be reduced for a more stable
operation.
Woodward

Figure 5-3. Gain Slope

The use of negative Gain Slope should be considered carefully. Low
gain at high fuel levels will result in poor load rejection response or
possible overspeed. To prevent possible serious injury from an
overspeeding engine, the Maximum Fuel Limit must be set near the
full load output current demand to prevent excessive integrator
windup and a subsequent low gain condition.
An actuator bump is recommended to test dynamic settings.
723PLUS Digital Marine Control
77