Manual 02879 723PLUS/Analog Load Sharing
Woodward 85
5. Adjust for stable operation.
If the engine is hunting at a rapid rate, slowly decrease the Gain until
performance is stable. If the engine is hunting at a slow rate, increase the
Reset time. If increasing the Reset time does not stabilize the engine, it also
may be necessary to slowly decrease the Gain OR to slowly decrease the
Gain and increase the Compensation.
This completes the start-up adjustments. We recommend saving the settings at
this time by pressing the “SAVE” key on the Hand Held Programmer or by saving
settings with Control View or Watch Window (Refer to “help” if you need help).
The Programmer will display the message “Saving Changes”. Control View or
Watch Window has a “pop-up” box that says the value have been saved.
Dynamic Adjustments
The objective of the dynamic adjustments is to obtain the optimum, stable engine
speed response from minimum speed/load to full speed and load. All
adjustments apply to both 1st dynamics (2nd Dynamics or CB Aux contact open)
and 2nd dynamics (2nd Dynamics or CB Aux contact closed).
Do the following adjustments first for 1st dynamics (2nd Dynamics or CB Aux
contact open). Use the 1st Dynamics Menu to set the 1st dynamics, if changes
are needed.
Then repeat the adjustments for 2nd dynamics (2nd Dynamics or CB Aux contact
closed). Use the 2nd Dynamics Menu to set the 2nd dynamics, if changes are
needed.
1. No-Load Adjustments
Do this adjustment without load applied.
Slowly increase the Gain set point until the actuator output or engine speed
becomes slightly unstable, then reduce the Gain as necessary to stabilize
the engine.
After acceptable performance at no load, record the Actuator Output as read
on the Display Menu. Set the Gain Slope Breakpoint (1st Dynamics Menu)
and the Fuel Demand @ Min LD (KW SETTING menu) to this reading.
Observe the movement of the actuator. If the activity of the actuator is
excessive, reduce the 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:
• Gain is too high and Reset is too low. Reduce the Gain by 50% (i.e., if
the Gain was 0.02, reduce it to 0.01) and increase Reset slightly.
Observe the movement of the actuator or actuator output. Continue to
increase Reset until the movement is active and acceptable but not
rapid or excessive. A final value of Reset should be between 1.0 and
2.0 for most large engines. If the Reset value exceeds 2.0, but this
procedure continues to improve performance, increase the
Compensation set point 50% and repeat the procedure.
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