Manual 02880
723PLUS/Single Engine Marine Propulsion
Woodward
79
5.
TORSNL LEVEL @CLEAR can be adjusted to the reading recorded above
for the TORSIONAL LEVEL after the limit was reduced.
The Torsional Limit Function may not be required if the Torsional
Filter Function can reduce oscillations sufficiently. This situation is
desirable because the load is not affected while operating at the
torsion point.
Fuel Limiters Adjustments
Fuel limiters limit the fuel demand during various conditions.
1.
Start Fuel Limit sets the maximum Fuel Demand when the engine is starting
and the engine speed is below idle. The limit is usually set at the fuel level
required to start the engine. It is usually greater than the Fuel Demand at
Idle Speed and substantially less than 100 percent Fuel Demand.
Reduce the value of item START FUEL LIMIT(%FD) in menu FUEL
LIMITERS and start the engine. Repeat until the engine no longer starts
satisfactorily. Note that item ON START LIMIT (LSS) in the DISPLAY CTRL
MODE menu can be monitored to determine when the Start Limiter is
limiting Fuel Demand.
2.
Start Ramp Rate sets how fast the Start Fuel Limit increases as the engine
is cranking. The final adjustment should be made on a cold day when the
normal starting Fuel Demand is insufficient to start the engine. Increase the
Start Ramp Rate, if necessary, to achieve satisfactory starts.
3.
Maximum Fuel Limit sets the maximum Fuel Demand. Adjust so that all
loads and transients can be satisfactorily assumed by the genset. Note that
very hot days may require more fuel for the engine to operate at full load.
Speed Adjustments
Adjustment of the idle, rated, raise, and lower references should not require
further setting as they are precisely determined. The Remote Speed Setting
input, however, involves analog circuits and may require adjustment.
1.
4 to 20 mA Remote Speed Setting Input
Apply 4 mA to the Remote Speed Setting Input. Be sure remote operation is
selected (Raise Speed and Lower Speed contacts both closed). If the
engine rpm is lower or higher than desired, increase or decrease the 4 mA
Remote Reference set point to obtain the correct speed. There may be a
small difference between the set point and actual speed which compensates
for the inaccuracies in the analog circuits.
Now apply 20 mA to the Remote Speed Setting Input. Wait until the ramp
stops. Increase or decrease the 20 mA Remote Reference set point to
obtain the engine rpm desired.
Repeat the above steps until the speeds at 4 mA and 20 mA are within your
required range.
Summary of Contents for 723PLUS
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