Woodward 723PLUS Technical Manual page 78

723PLUS Digital Marine Control Manual 26482
Verify that Relay #2 contacts are configured for the desired logic, closed or open,
upon active Major Alarm. Verify that the current contact status matches the 01
MAJOR ALARM prompt and is correctly indicated by the necessary monitoring,
shutdown, and alarm equipment.
Clutch Command Contacts (Relay Output #3)
The contacts at terminals 7 & 8 will be closed when clutched in, or when
requested to clutch in and all the clutching permissives have been met. The
contacts at terminals 7 & 8 will be open once asked to de-clutch (open Clutch
Request input), and the engine load is ramped to the Unload Trip Point. Jumper
terminals 7 & 8 and verify that the respective clutch relay picks up. Remove the
jumper and verify that the clutch relay drops out.
FAILED SPD SENSOR #1 LED
The failed speed sensor #1 LED is a visual indication that speed sensor 1 has
gone below the failsafe speed while the 723PLUS control was in run mode.
FAILED SPD SENSOR #2 LED
The failed speed sensor #2 LED is a visual indication that speed sensor 2 has
gone below the failsafe speed while the 723PLUS control was in run mode.
LED #3
This LED will flash on and if when the 723PLUS control LON ADDRESS CH#1
and LON ADDRESS CH#2 are not set or are improperly set. Do not parallel
engines until this LED has been extinguished.
LED #4
This LED is programmed to illuminate when both Control LON Channel #1 and
Control LON Channel #2 have a communication fault. If this LED is illuminated,
the control will not perform its design functions including synchronizing, soft
loading, torque sharing, master/slave speed reference, etc. For proper operation
this LED must be OFF! Do not parallel engines until this LED has been
extinguished.
Speed Sensor 1 (Speed Sensor Input #1)
Verify the MPU shield is tied only to the 723PLUS control ground and nowhere
else in the system. If an MPU is used, measure the resistance across terminals
11 & 12. The resistance depends on the MPU used but should be less than
250 . Disconnect the MPU connector at the MPU and the resistance value
should be greater than 250 . The typical input resistance for an MPU speed
sensor is 250 ±50 . Check the resistance of the MPU and verify it is within the
manufacturer's specifications. Reconnect the MPU connector.
A proximity probe cannot be tested using this manner. For a proximity probe,
verify the wiring to the proximity probe including the power supply wiring. The
MPU or proximity probe will be tested prior to running the engine.
68 Woodward