Armstrong World Industries A50CU - Manual (Page 18)

AR-EXP-CUMMINS-07-00 OWNERS MANUAL
Page 18
the start was initiated by remote start), the return delay
timer is initiated after which the load Transfer signal is de-
energized, removing the load. ¾ second later, the mains
load switch is closed, returning the mains on load. If the
generator set has been on load, The Cooling timer is then
initiated, allowing the engine a cooling down period off load
before shutting down.
Once the Cooling timer expires the Fuel Solenoid is de-
energized, bringing the generator to a stop. Should the
mains supply fail, or Remote Start signal be re-activated
during the cooling down period, the set will return on load.
7.2. Manual Operation
To initiate a start se-
quence in MANUAL, press
the pushbutton. When the controller is in the
manual mode (indicated by an LED indicator beside the
button), pressing the START (I) button will initiate the start
sequence.
If the pre-heat output option is selected this timer is then
initiated, and the auxiliary output selected is energized.
After the above delay the Fuel Solenoid is energized, then
the Starter Motor is engaged. The engine is cranked for a
pre-set time period. If the engine fails to fire during this
cranking attempt then the starter motor is disengaged for
the pre-set rest period. Should this sequence continue be-
yond the set number of
attempts (fixed at 3), the start sequence will be terminated
and Fail to Start fault will be displayed accompanied by a
flashing shutdown indicator.
Fail to start
Shut Down
When the engine fires, the starter motor is disengaged and
locked out at a pre-set frequency from the Alternator out-
put. Alternatively a Magnetic Pickup mounted on the fly-
wheel housing can be used for speed detection (This is
selected using the front panel editor or PC). After the starter
motor has disengaged, the Safety On timer is activated,
allowing Oil Pressure, High Engine Temperature, Under-
speed, Charge Fail and any delayed Auxiliary fault inputs to
stabilize without triggering the
fault. Once the engine is running, the Warm Up timer, if
selected is initiated, allowing the engine to stabilize before
it can
be loaded.
The generator will run off load, unless the mains supply
fails, or a Remote Start signal is applied. The generator will
continue to run On load regardless of the state of the mains
supply and/or remote start input until the Auto mode is
selected, the Stop button is pressed, or an electrical trip or
shutdown alarm is detected. Selecting STOP (O) de-
energizes the FUEL SOLENOID, bringing the generator to a
stop.
7.3. Protections
The module will indicate that an alarm has occurred in sev-
eral ways:
 The ―Common alarm‖ LED will illuminate (Warning =
Red steady, Shutdown = Red Flashing)
 If appropriate, the LCD display or LED indicators will
display the appropriate alarm icon i.e. for battery
charging failure.
If no alarms are present the
LCD
will extinguish any alarm icons.
In the event of a warning alarm the LCD will display the
appropriate icon. If a shutdown then occurs the module will
display the appropriate icon. The original warning alarm
icon will remain displayed.
Charge alternator warning (all
symbols steady)
Charge alternator warning
indicator still present, com-
mon alarm indicator has
changed to a shutdown sym-
bol and is now flashing. Also
present is the flashing over-
speed LED.
Overspeed and Shutdown alarm Icons are displayed flash-
ing. The original warning will remain displayed as long as
the triggering conditions remain. Any subsequent warnings
or shutdowns that occur will be displayed steady, therefore
only the first-up shutdown will appear flashing.
Warnings
Warnings are non-critical alarm conditions and do not affect
the operation of the generator system, they serve to draw
the operators attention to an undesirable condition. In the
event of a warning alarm the LCD will display: