The wire size that is used for the ground plate must
be large enough to handle the full charging current of
the alternator.
i02302349
Engine Electronics
SMCS Code: 1000; 1400; 1900
Electrical shock hazard. The electronic unit injec-
tor system uses 90-120 volts.
The ECM sends a high voltage signal to the unit
injectors. To help prevent personal injury, do not
disconnect the unit injector connector while the
engine is operating. Do not come in contact with the
harness connector for the unit injector while the
engine is operating.
Tampering with the electronic system installation
or the OEM wiring installation can be dangerous
and could result in personal injury or death and/
or engine damage.
Note: The control panel can only be programmed
with electronic service tools and passwords. For
information on programming, see the Service
Manual, SENR6477, “Electronic Troubleshooting”
module.
The engine has a monitoring system that can
respond to abnormal engine operation with these
modes: WARNING, DERATE and SHUTDOWN.
These modes are available in order to help prevent
damage to the engine. The customer can program
these modes “ON” or “OFF” .
A warning indicates a serious condition that requires
immediate attention. If a derating occurs, the engine
power and/or the engine rpm is limited.
The following conditions will cause an engine
shutdown:
• Engine overspeed
• High aftercooler coolant temperature
• High coolant temperature (jacket water)
• High crankcase pressure
• Low engine oil pressure
Except for an overspeed shutdown, the monitoring
system can be overridden. An override switch is
located in the control panel. Use of the switch will
allow the engine to provide full power during an
abnormal engine operating condition. The override
switch is provided only for use in emergency
situations.
For more information on the conditions that can
initiate warnings, deratings, and shutdowns, see this
Operation and Maintenance Manual, “Control Panel”
topic (Operation Section).
i01226491
Generator Isolating for
Maintenance
SMCS Code: 4450
When you service an electric power generation set or
when you repair an electric power generation set,
follow the procedure below:
1. Stop the engine.
Illustration 20 g00104545
2. Attach a “DO NOT OPERATE” or similar warning
tag to the engine prime mover starting circuit.
Disconnect the engine starting circuit.
3. Disconnect the generator from the distribution
system.
4. Lock out the circuit breaker. Attach a “DO NOT
OPERATE” or similar warning tag to the circuit
breaker. Refer to the electrical diagram. Verify that
all points of possible reverse power flow have
been locked out.
5. Remove the fuses for the transformers for the
following circuitry:
• power
• sensing
16
SEBU7125-13
Safety Section
Engine Electronics
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