Woodward 723PLUS Technical Manual page 30

723PLUS Digital Marine Control
Run/Stop (Input A; Terminal 29)
The external contact used to activate the Run/Stop command connects to
terminal 29 (Discrete Input A). This discrete input changes the control operation
by immediately decreasing the fuel demand to zero. The Run/Stop command is
the preferred means of signifying a normal engine shutdown. This input can be
selected for either "Open to Run" or "Close to Run" operation based on the 06
CONT A OPEN TO RUN setpoint in the B**CFIG OPTION** configuration menu.
When programmed for "Open to Run", normal speed control function is enabled
when the switch or relay contact is open (discrete input in the "FALSE" state).
When the switch or relay contact is closed (discrete input in the "TRUE" state),
the Minimum Fuel Function will immediately pull the fuel demand to zero. The
control output to the actuator will be the minimum fuel demand when voltage is
applied to terminal 29. The opposite is true when configured for "Close to Run".
The input must have voltage applied to terminal 29 to operate the engine.
The Run/Stop discrete input is not intended for use as the sole
means of shutdown in any emergency stop sequence. To prevent
possible serious injury and engine damage from an overspeeding
engine, do NOT use the Run/Stop discrete input as the sole means of
shutdown in any emergency stop sequence.
De-Clutch Request (Input B; Terminal 30)
Close this contact to begin the de-clutching process. The process begins by
softly unloading the engine and then de-clutching. Once de-clutched, the engine
speed will be forced to idle and then returned to its normal remote speed setting
reference.
Maneuvering Mode (Input C; Terminal 31)
For applications where a generator may also be connected to the engine shaft, it
is desired to have the engine run at a fixed speed. In many cases the vessel may
be using electric thrusters for positioning in this mode, thus the name
Maneuvering mode. By closing Discrete Input C on the master unit, the engine
speed setpoint will ramp to a fixed programmed value. If both units are clutched
in, the slave unit will follow the speed setpoint of the master.
Clutch Engaged Contact (Input D; Terminal 32)
The external contact used to activate the Clutch Engaged command connects to
terminal 32 (Discrete Input D). This discrete input changes the control operation
by providing the clutch status input for the clutching and torque sharing logic and
the speed control dynamics selector. When the switch or relay contact is closed
(discrete input in the "TRUE" state), the control expects the clutch to be closed.
When the switch or relay contact is opened (discrete input in the "FALSE" state),
the control expects the clutch to be opened. This input signal must be present for
the engine to load share in either Manual mode or Automatic mode.
20
Manual 26482
Woodward