Woodward 723PLUS Technical Manual page 86

723PLUS Digital Marine Control

01 Idle Gain is too low. If the preceding procedure does not improve the
slow periodic cycling of the engine speed, the control may be limiting cycling
through the low gain control region set by the Window Width set point.
Increase the 01 Idle Gain set point to minimize the cycling. If actuator
movement becomes excessive, reduce the 04 Actuator Compensation set
point until movement is acceptable. In some cases, 04 Actuator
Compensation may be reduced to 0.01 and only the 01 Idle Gain and 03
Reset adjustments used. This should be done only if necessary to eliminate
excessive actuator response periodic disturbances. Reduce the Window
Width set point until the limit cycle amplitude is acceptable and without
excessive rapid actuator movement.
3. Minimum Load Adjustment – High Speed
Do this adjustment at high speed and low load conditions at which the
engine is operated.
Observe the movement of the actuator. If movement is excessive, reduce
the 02 Rated Gain set point slightly to achieve an acceptable actuator
movement level.
If there is a slow periodic cycling of the engine speed above and below the
speed setting, there are two possible causes:

02 Rated Gain is too high and 03 Reset is too low. Reduce the 02 Rated
Gain by 50% and increase 03 Reset slightly. Observe the movement of the
actuator or actuator output. Continue to increase 03 Reset until the
movement is active and acceptable but not rapid or excessive. A final value
of 03 Reset should be between 1.0 and 2.0 for most engines. If the 03 Reset
value exceeds 2.0, but this procedure continues to improve performance,
increase the 04 Actuator Compensation set point 50% and repeat the
procedure.

02 Rated Gain is too low. If the preceding procedure does not improve the
slow periodic cycling of the engine speed, the control may be limiting cycling
through the low gain control region set by the Window Width set point.
Increase the 02 Rated Gain set point to minimize the cycling. If actuator
movement becomes excessive, reduce the 04 Actuator Compensation set
point until movement is acceptable. In some cases, 04 Actuator
Compensation may be reduced to 0.01 and only the 02 Rated Gain and 03
Reset adjustments used. This should be done only if necessary to eliminate
excessive actuator response periodic disturbances. Reduce the Window
Width set point until the limit cycle amplitude is acceptable and without
excessive rapid actuator movement.
4. Full Load Adjustment
Do these adjustments at rated speed and load or at the speed and load at
which the engine is most often operated.
Once the clutched is engaged, the dynamics being used will be under the
F**DYNAMICS CLUTCHED. Start by copying all of the dynamic settings
used in the E**DYNAMICS DE-CLUTCHED to the F**DYNAMICS
CLUTCHED settings. This gives you a good starting point. Start by tuning
the 01 Idle Gain 2, 03 RESET 2 and 04 ACT COMP 2 for stable operation at
low speed. Increase the speed and the load and adjust the 02 RATED GAIN
2.
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Manual 26482
Woodward