Woodward 723PLUS Technical Manual page 83

Manual 26482
Torque Input (Analog Input #1)
If the Torque Input fails, the 723PLUS control will default to using the actuator
fuel demand to indicate engine load.
Adjusting two known points of the torque transducer output, the minimum torque
and the maximum torque, performs the torque transducer setup. The input signal
must be direct acting (increase torque to increase both fuel and milliamps).
Remote Speed Setting Input (Analog Input #2)
The remote speed setting voltage input signal must be calibrated for acceptable
system performance. Verify with a voltmeter that the remote speed setting device
outputs 1 Vdc at the idle or minimum position to the 723PLUS and 5 V to the
723PLUS at the rated or maximum position. With the Handheld programmer or
the Watch Window PC interface enter the Service mode, find the header
A**DISPLAY 1**, and at prompt 02 SPEED REFERENCE (RPM), view the
remote speed setting input (it is displayed in rpm). This is the voltage input signal
after it has been converted to engineering units (in this case rpm).
While leaving the 02 SPEED REFERENCE (RPM) displayed on one line of the
hand held programmer or on a Watch Window inspector, find and display the
prompt 08 REMOTE REF @ 1 V (it is under header G**SPEED REFERENCE**)
on the other line of the hand held programmer or a Watch Window inspector. Set
the remote speed setting device for its idle speed position. Adjust the 08
REMOTE REF @ 1 V value until the 02 SPEED REFERENCE (RPM) prompt
value displays the desired speed reference setting (in rpm) for this position. Set
the remote speed setting device for its rated speed position. Adjust the 09
REMOTE REF @ 5 V value until the 02 SPEED REFERENCE (RPM) prompt
value displays the desired speed reference setting (rpm) for the rated speed
position. Move the remote speed setting device to intermediate positions
between its idle speed position and its rated speed position to verify the desired
speed settings at each position. The remote speed setting input is now
calibrated.
J2 and J3
All values are preset. No calibration required.
Start Fuel Limit Calibration
The start fuel limit is set to provide the desired maximum percent actuator driver
output during starts. The start fuel limit should be set to provide consistent
starting during hot and cold starts. Once it is felt that the start fuel limit is properly
set, it is a good idea to test it under all required starting conditions so that
consistent starting can be expected. The Start Fuel Limit set point is found in
Service mode, under the header H**START/MAX LIMITS**, at prompt 01 START
FUEL LIMIT (see Figure 5-2).
Woodward
Since the percent actuator driver signal is used for the default
condition, it must always be calibrated.
723PLUS Digital Marine Control
73