4-63. GENERAL. (cont)
Elec trical Function.
the EECM logic that an engine startup
is beginning, and it begins to monitor
the status of the engine.
also provided to the electric
The pump operates to
pressurize the fuel system.
(2) Enqine Startup.
MASTER SWITCH is momentarily placed in
the START position and then released, a
start signal is sent to the EECM.
EECM then checks the status of the
monopole speed sensor.
If the EECM
senses a reading of other than zero, it
will not continue the start sequence.
If it senses a reading of zero, it
shows that the engine is not running
and the EECM will provide a signal to
start the high pressure fuel pump. It
also sends signals to the Igniter, fuel
shutoff/drain solenoid valve, and the
starter. The starter turns and cranks
As the engine starts, the
EECM monitors engine speed through the
monopole speed sensor, and exhaust gas
through the EGT thermo-
If engine speed does not reach
10 percent of full
speed within 5
the EECM will disable the
igniter, high pressure fuel pump, and
engine speed is correct, the engine is
allowed to continue building speed. If
exhaust temperature does not rise after
the start signal is sent, the EECM
senses that ignition did not take place
and will stop the engine.
temperature does rise, the engine is
allowed to continue building speed. The
EECM continues to monitor engine speed
through the monopole
Engine speed is
compared to speed
values stored in the EECM.
If there is
a difference between engine speed and
the stored value, the EECM will signal
the fuel system to increase or decrease
MARINE CORPS TM 6115-12/7
This allows the engine to
build speed at the proper rate.
the engine reaches 60 percent of maxi-
mum speed, the EECM will disable the
start sequence and allow the engine to
build speed by itself.
(3) Contactor Enablinq. When the
engine reaches maximum speed, the EECM
will turn on the CONTACTOR READY TO
LOAD lamp and start the HOURMETER. This
tells the operator that the generator
has developed rated load and is ready
to supply electrical power.
CONTACTOR switch is momentarily placed
in the CLOSED position, the EECM senses
signal through the control panel to the
This closes the con-
power to pass
from the generator,
through the power cable, to the air-
It also turns on the CONTACTOR
CLOSED lamp on the control panel to
show the operator that the circuit is
complete between the generator set and
Output power can be adjusted by using
the VOLTAGE ADJUST knob on the control
The knob controls a potenti-
ometer that will send signals from the
control panel to the generator elec-
tronic control module (GECM). The GECM
the generator to adjust
output to the load.
(5) Batt ery Charqinq Ammeter. The
continually being charged
the engine is
charging rate is shown on the BATTERY
CHARGING ammeter on the control panel.
The signal displayed on the ammeter is
brought to the control panel by a line
from a shunt located in the inlet air