Overspeed Trip; Remote Speed Input Fault; Torque Sensor Input Fault - Woodward 723PLUS Technical Manual

Manual 26482
LED #4
LED #4 is used to indicate that both Control LON Channel #1 and Control LON
Channel #2 have a communication fault. The four causes are: 1.) The configured
node addresses of both 723PLUS controls for LON Channel #1 and LON
Channel #2 are the same. 2.) LON #1 and LON #2 of one control has a hardware
fault (replace control). 3.) The communication lines between LON #1 and LON #2
of both controls are broken. 4.) Wire connections between LON #1 and LON #2
of both controls are not correct.
The overspeed fault is latched when either one of the speed sensor signals goes
above the adjustable overspeed set point. The status of the overspeed fault is 06
ENGINE OVER SPED? (B**DISPLAY 2**). There are no delays in the overspeed
fault, so an intermittent signal will cause the fault to latch. An overspeed trip will
cause the actuator output to go to minimum position, which should shut down the
engine. The overspeed trip can be reset as described in the Alarm/Fault Resets
paragraph.
The minor and major alarms can be configured to alarm when an overspeed trip
has occurred.
The remote speed input fault is latched when the sensed input signal goes
outside the 2.0 mA (0.5 V) and 22.0 mA (5.5 V) range for more than the
configured alarm delay time. The status of the fault is found at prompt 04
REMOTE SPEED FAILED in either the C**MAJOR ALARMS** or D**MINOR
ALARMS** headers, if the Remote Speed Input Fault has been selected as one
of these alarms. If the Remote Speed Setting Input is used, we recommend that
the Remote Speed Input Fault be configured to activate one of the alarms.
The Torque Sensor input fault is latched when the sensed input signal goes
outside of the 2 mA (0.5 V) and 22.0 mA (5.5 V) range for more than the
configured alarm delay time. The status of the fault is found at prompt 06 or 05
TORQUE INPUT FAILED in either the C**MAJOR ALARMS** or D**MINOR
ALARMS** headers, if the Torque Sensor Input Fault has been selected as one
of these alarms. If the Torque Sensor Input is used, we recommend that the
Torque Sensor Fault be configured to activate one of the alarms.
When the torque sensor fault is latched, the 723PLUS control automatically
switches to the default actuator fuel demand based on the percent actuator driver
output. The 723PLUS control will function normally (torque sharing, fuel limiting,
etc.) when using the default rack calibration (if it was set up properly).
Woodward

Overspeed Trip

Remote Speed Input Fault

Torque Sensor Input Fault

723PLUS Digital Marine Control
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