Manual 02879 723PLUS/Analog Load Sharing
Woodward 67
4. IDLE SPEED (RPM) is the speed that the speed reference ramp goes to
when the Close for Rated Discrete Input is OPEN. It is normally the speed
at which the engine is operated at start-up. It is also used during cool down.
WARNING—IDLE SPEED
To prevent possible death or serious injury from an overspeeding engine,
Idle speed must be set the same as or lower than Rated speed.
CAUTION—IDLE SPEED
Be sure to avoid critical speeds when setting idle speed.
5. ACCEL RAMP TIME (SEC) is the time required for the control to ramp the
engine speed from Idle speed to Rated speed. The ramp is started
whenever the Idle/Rated contact is closed.
6. DECEL RAMP TIME (SEC) is the time required for the control to ramp the
engine speed from Rated speed to Idle speed. The ramp is started
whenever the Idle/Rated contact is opened.
NOTE
Actual engine deceleration may be slower than set by the Decel Ramp Time
set point. This occurs when the Decel Ramp Time set point is faster than the
amount of time that system inertias allow the engine to slow down. This
condition is indicated by the control actuator output going to the minimum
fuel position.
7. RAISE SPEED RATE (RPM/MIN) is the rate at which the speed reference
is ramped when using the Raise Speed input, as well as when the Remote
Speed Setting input is changed in the increase direction. A step change on
the remote input does not cause an immediate change in the reference.
Instead, it is ramped to the new setting at the Raise Speed Rate.
8. LOWER SPEED RATE (RPM/MIN) is the rate at which the speed reference
is ramped when using the Lower Speed input, as well as when the Remote
Speed Setting input is changed in the decrease direction. A step change on
the remote input does not cause an immediate change in the reference.
Instead, it is ramped to the new setting at the Lower Speed Rate.
9. AI OVERRIDE LEVEL (%RATED)—This is the speed level at which the
analog inputs will be reset should they be failed during starting.
10. AI OVERRIDE TIME (SEC)—This is the delay time before the analog inputs
will be reset after speed reaches the AI OVERRIDE LEVEL.
11. AI CB CLS ARM DELAY (SEC)—This is the delay time before arming the
analog input failure alarm and shutdown functions after the CB AUX input
closes. This allows voltage excitation and other sources for the inputs to
stabilize before monitoring the inputs for failure. The alarm and shutdown
bypass function is reset when speed drops below the AI OVERRIDE
LEVEL.
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