Engine Electronics - Perkins 904D-E28T Operation And Maintenance Manual

M0108133-04
Illustration 16
Typical example
(4) Ground to the battery
(5) Ground to the engine block
(6) Primary position for grounding
NOTICE
For 904D-E36TA industrial engines, ensure that a 12
VDC or 24 VDC battery source is used to start the en-
gine. For 904D-E28T industrial engines, use a 12
VDC battery source to start the engine. Never at-
tempt to start an engine from an external power
source such as electric welding equipment, which
has a voltage that is unsuitable for engine starting
and will damage the electrical system.
Correct grounding for the engine electrical system is
necessary for optimum engine performance and
reliability. Incorrect grounding will result in
uncontrolled electrical circuit paths and in unreliable
electrical circuit paths.
Uncontrolled electrical circuit paths can result in
damage to the crankshaft bearing journal surfaces
and to aluminum components.
Engines that are installed without engine-to-frame
ground straps can be damaged by electrical
discharge.
To ensure that the engine and the engine electrical
systems function correctly, an engine-to-frame
ground strap with a direct path to the battery must be
used. This path may be provided by way of a direct
engine ground to the frame.
The connections for the grounds should be tight and
free of corrosion. The engine alternator must be
grounded to the negative "-" battery terminal. The
wire used must be adequate to handle the full
charging current of the alternator.
The power supply connection for the engine
electronics should always be from the isolator to the
battery. It is the decision of the OEM which polarity
the isolator is connected to.

Engine Electronics

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.
g06579672
Electrical Shock Hazard. The electronic unit injec-
tors use DC voltage. The ECM sends this voltage
to the electronic unit injectors. Do not come in
contact with the harness connector for the elec-
tronic unit injectors while the engine is operating.
Failure to follow this instruction could result in
personal injury or death.
This engine has a comprehensive, programmable
Engine Monitoring System. The Electronic Control
Module (ECM) monitors the engine operating
conditions. If any of the engine parameters extend
outside an allowable range, the ECM will initiate an
immediate action.
The following actions are available for engine
monitoring control:
• Warning: A warning light could be illuminated or a
sound warning could be activated (horn)
• Derate: The engine power could be reduced by 50
percent
• Shutdown: The engine could be shut down or only
operate at low idle
The following monitored engine operating conditions
and components can limit engine speed and/or the
engine power:
21
Safety Section
Engine Electronics
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