Installation manual

TO
ELECTRONIC FUEL INJECTION
The above illustration shows the throttle body assembly that
attaches to the intake manifold.
An electronic control unit (ECU) controls the fuel injector
and the stepper motor.
The
ECU is supplied with engine operating conditions from
sensors that monitor intake air temperature, engine coolant
temperature, map sensor (intake manifold absolute pressure),
engine rpm and battery voltage.
The
ECU interprets this information to determine the
appropriate injector pulse rate and throttle opening position.
A high pressure fuel pump supplies fuel to the area around
the injector and the regulator maintains the fuel pressure in
that area at 35 -
40 PSI maximum.
The injector is a solenoid operated pintle valve that meters
fuel into the intake manifold depending on engine operating
conditions and generator amperage load determined by the
ECU.
Air flow into the intake manifold is
controlled by the ECU
operation of the throttle plate via the stepper motor .. Throttle
plate positioning for proper air flow into the engine is
accomplished through the
ECU interpretation of engine
operating conditions. The Schrader valve is used to'
monitor/check fuel pressure around the fuel injector.
ELECTRONIC CONTROL UNIT (ECU)
The ECU (Electronic Control Unit) is factory programmed
NOTE: When changing the generator frequency, tum OFF
the DC 20 amp breaker before moving the dipswich.
The vacant program connector is used by the factory to input
the operating program into the ECU. This connector can be
used with software to monitor the operation
of the Safe CO
system. Contact your MD to obtain free software.
The electrical connections from the engine electrical harness
are made to the
ECU through two plug connections, one 23
pin and one 35 pin and may therefore vary in number
·according to the generator model. For further details, consult
the engine circuit wiring diagram in this manual.
The
ECU is normally set for operation at 60Hz unless
specified otherwise, and is internally configured for a 4 pole
generator. If it is necessary to replace the ECU, make sure it
is configured
by label for the generator in use.
ECU ADJUSTMENTS
Stability Trim (Gain)
When changing engine speed, or if no engine hunting
condition should occur, the gain pot may require adjustment.
There is no specific set point for this adjustment and it is
normally set to the middle of its range or to a point in its
range which obtains optimal engine speed response without
any tendency
of hunting.
Setting Engine Speed
The engine speed can be set for operation at either 50 or 60
Hz. Corresponding engine speeds for a 4 pole generator are
1500 rpm or 1800 rpm.
1. Set up whatever equipment is to be used to measure
engine speed
or generator output frequency.
2. Start up and run the generator at the cmTent operating
·speed and frequency.
·
3. Adjust the GAIN setting between 40 - 60 for best system
reaction to AC amperage load changes.
NOTE: A higher GAIN adjustment can induce unstable engine
operation. In such cases, lessen the GAIN adjustment.
Replacing the ECU
Remove the control box cover. Before attempting to remove
the ECU, tum
OFF the 20 amp DC control panel breaker.
Unplug the two engine harness connections. Then unscrew
the four side screws securing the
ECU and remove it from
it's holder. To install a new ECU, reverse the procedure.
ECU
and requires no adjustments by the generator operator. It PROGRAM
controls all starting, operating and safety shutdown feattrres CO
on the engine. The Gain Pot is set at #50 midpoint for
optimum system
resp<mse.
Dipswitch #1 is used to charge the generators frequency.
ON is for 50 hertz and OFF is for 60 hertz operation. The
remaining switches #2, 3#. and #4 service no functions.
ADJUSTMENT POT
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