SERVICE MENUS
It is not necessary to stop the engine to access the Service menus. The Service menus are
used to adjust or monitor the set points.
Display 1
The operator can monitor engine parameters on the Hand Held programmer’s screen.
1. Engine Speed
The current engine speed is displayed in rpm.
2. Speed Reference
The current Speed Reference is displayed in rpm. However, the value displayed here
may not match the actual speed reference value if the engine is operating in droop mode,
the actuator output is limited by fuel limiters, or the actual speed reference is changed
for some other reason. So this value may not match the actual speed reference.
3. Generator Load
The current generator load (KW output) is shown.
4. Actuator Output
The actuator percent output is shown. When the 721 control actuator driver outputs 180
mA, the value shown here is 100%. This monitor value is referred when setting set
points for fuel limits and the gain breakpoint.
5. Fuel Limit Output
The max actuator percent output limited by the current fuel limit is shown.
Dynamics 1
Tune the control dynamics for stable engine operation and most suitable transient
performance. This 721 control has two sets of dynamics. The dynamics used in the 721
control are selected with an external contact input. See figure 2 for tuning Prop.Gain
(traditional Gain in Woodward controls) and Integrator Rate (traditional Reset in Woodward
controls).
1. Idle Prop. Gain 1
This set point is effective while Start Speed is selected as the speed reference. (Hence,
contact B is open.) Idle Prop. Gain determines how fast the control responds to an error
in engine speed from the speed reference setting while Start Speed is selected.
2. Rated Prop. Gain 1
Adjust this set point to get stable engine operation above and below the rated speed with
light load or no load. Rated Prop. Gain determines how fast the control responds to an error in
engine speed from the speed reference setting while the Rated Speed is selected.
3. Integrator Rate 1
Integrator Rate compensates for the lag time of the engine. It adjusts the time required
for the control to return the speed to zero error after a disturbance. Integrator Rate is
adjusted to prevent slow hunting and to minimize speed overshoot after a load
disturbance.
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