Armstrong World Industries A50CU - Manual (Page 19)

AR-EXP-CUMMINS-07-00 OWNERS MANUAL
BATTERY CHARGE FAILURE
If the module does not detect a voltage from the warning
light terminal on the auxiliary charge alternator the icon will
illuminate.
FAIL TO STOP
If the module detects the engine is still running when the
Fail to stop timer‘ expires, then the module will display:
AUXILIARY INPUTS
If an auxiliary input has been configured as a warning the
appropriate LCD segment will be displayed.
SHUTDOWNS
Shutdowns are latching and stop the Generator. The alarm
must be cleared, and the fault removed to reset the mod-
ule. In the event of a shutdown alarm the LCD will display:
FAIL TO START, if the engine does not fire after the pre-set
number of attempts has been made a shutdown will be
initiated. The icon will illuminate.
EMERGENCY STOP
Removal of the Positive DC Supply from the Emergency
Stop input initiates the following sequence, firstly it will initi-
ate a controlled shutdown of the Generator and prevent any
attempt to restart the Generator until the Emergency Stop
push-button has been reset. Secondly it removes the Posi-
tive DC supply from both the Fuel Solenoid and Starter Sole-
noid. The icon will illuminate.
LOW OIL PRESSURE
If the module detects that the engine oil pressure has fallen
below the low oil pressure trip setting level after the Safety
On timer has expired, a shutdown will occur. The icon will
illuminate.
HIGH ENGINE TEMPERATURE
If the module detects that the engine coolant temperature
has exceeded the high engine temperature trip setting level
after the Safety On timer has expired, a shutdown will oc- cur. The icon will illuminate.
OVERSPEED / OVERFREQUENCY
If the engine speed exceeds the pre-set trip a shutdown is
initiated. The icon will illuminate. Overspeed is not delayed,
it is an immediate shutdown.
UNDERSPEED / UNDERFREQUENCY
If the engine speed falls below the pre-set trip after the
Safety On timer has expired, a shutdown is initiated. The
icon will illuminate.
OIL PRESSURE SENDER OPEN CIRCUIT
If the module detects a loss of signal from the oil pressure
sender (open circuit) a shutdown is initiated. The LCD will
indicate:(Steady) (And ‗-----‗ on the engine oil pressure in-
strument). Sender failure is not delayed, it is an immediate
shutdown.
AUXILIARY INPUTS, if an auxiliary input has been configured
as a shutdown the appropriate LCD segment will be dis-
played:
LOSS OF SPEED SIGNAL
If the speed sensing signal is lost during cranking, a shut-
down is initiated. The icon will illuminate (Steady). As engine
speed cannot be determined, the entire ―fail to stop‖ timer
is observed before the alarm can be reset and the engine
restarted.
7.4. DESCRIPTION OF CONTROLS.
The following section details the function and meaning of
the various controls on the module.
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