Alarm Delay Time; Alarm/Fault Resets; Speed Sensor 1 & 2 Fault - Woodward 723PLUS Technical Manual

723PLUS Digital Marine Control Manual 26482

Alarm Delay Time

The analog input failed alarms are delayed before the actual fault is triggered.
The fault must be present for the entire delay time before the fault is activated.
This delay time is adjustable and is useful when dealing with intermittent or noisy
signals. The alarm delay time, 01 ALARM DELAY TIME (E**ALARMS/SD
CONFIGURE**), can be set to delay the fault from 0.01 to 60.0 seconds.

Alarm/Fault Resets

All of the alarms/faults detected by the 723PLUS control are latching faults.
Therefore, the alarms/faults may be true even though the alarm/faulted condition
has been cleared. Unless otherwise mentioned, there are four ways to reset the
latched (inactive) faults. If the faulted condition is still present when the reset is
attempted the fault will not clear. A fault reset is triggered when the engine speed
clears 5% of the rated speed set point during cranking. Another fault reset is
triggered from the hand held programmer or the Watch Window PC interface.
The reset is triggered by toggling the 16 RESET ALL ALARMS (C**MAJOR
ALARMS**, D**MINOR ALARMS**) from "FALSE" to "TRUE". The reset only
occurs on the transition from false to true.
Speed Sensor 1 & 2 Fault
The speed sensor faults are latched when the sensed speed falls below the
failsafe speed while the unit has been running (run mode). The FAILED SPD
SENSOR #1 LED and #2 LED are used to display the status of the speed sensor
faults. The respective LED will illuminate if the corresponding speed sensor fault
is latched. There are no delays in the speed sensor fault detection, so an
intermittent signal will latch a fault. When the engine is in stop mode, the speed
sensor fault is overridden. When the 723PLUS control is powered up or re-
booted by exiting Configuration, the speed sensor faults may be active. As soon
as the engine attempts to start, the speed sensor faults should clear. If one of the
speed sensors inputs is not used, the respective fault will latch once the engine
starts. A failed speed sensor will cause the 723PLUS control to disable the
flexible coupling filtering and switch to redundant (high signal select) speed
sensing mode. If both speed sensors faults are latched at the same time, the
control will go to minimum output. Most speed sensor problems are caused by
loose wires, improper MPU gap, poor MPU location, or by dirt, oil, or metal filings
on the end of the probe.
LED #3
LED #3 is used to indicate that the node addresses for LON ADDRESS CH#1
and LON ADDRESS CH#2 are not set or improperly set within each 723PLUS
control. There two conditions that will cause this LED to illuminate and flash are:
1) The configured node addresses of LON Channel #1 and LON Channel #2
within the same 723PLUS control are different. 2) The configured node address
for either LON Channel #1 or LON Channel #2 is set at "0".
84 Woodward