Woodward 723PLUS Technical Manual page 92

723PLUS Digital Marine Control
4. Analog Input #1—Torque Input Signal. This 4–20 mA signal is brought in
from the Torque Transducer. This signal is used for sharing the actual
torque across both engines while the engines are clutched together. If the
torque signal fails, then the 723PLUS uses the actuator fuel demand as a
way of determining load on the engine. Therefore it is critical that this input
be calibrated accurately. To verify calibration, monitor the two values at
SERVICE MENU: L**ACT / TORQUE CALIB** under the values 03
SCALED ACT COMMAND % and 07 TORQUE INPUT %. These two values
should be matched throughout the load of the engines while the engines are
clutched together. If they are not matched, then the four adjustments are: 04
TORQUE IN @ NO LOAD, 05 TORQUE IN @MAX LOAD, 01 ACT OUT %
@ NO LOAD and 02 ACT OUT @ MAX LOAD. Adjust these values until the
values 03 SCALED ACT COMMAND % and 07 TORQUE INPUT % are very
close during loaded and unloaded conditions.
5. Analog Input #2—Remote Speed Input. This signal is a 1–5 Vdc signal used
for setting the engine speed reference. The ship has local control, which is a
potentiometer local to the engines and bridge control coming from the bridge
and the TANO system. The Speed Reference can be monitored at
SERVICE MENU: A**DISPLAY 1 under 02 SPEED REFERENCE. When
the input is at 1.0 Vdc the speed reference should be at 350 rpm. When the
input is at 5.0 Vdc, the speed reference should be at 900 rpm.
6. Analog Input #3—Rack Input. Please see item #3—Analog Output #4 for
calibration.
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Manual 26482
Woodward