SEBU8191-01 11
Safety Section
Electrical System
i02414678
Electrical System
Never disconn
ect any charging unit circuit or battery
circuit cable from the battery when the charging unit
is operating. A spark can cause the combustible
gases that ar
e produced by some batteries to ignite.
To help prevent sparks from igniting combustible
gases that a
re produced by some batteries, the
negative “−” cable should be connected last from the
external power source to the negative “−” terminal of
the starti
ng motor.
Check the electrical wires daily for wires that
arelooseo
r frayed. Tighten all loose electrical
connections before the engine is started. Repair all
frayed electrical wires before the engine is started.
See the Op
eration and Maintenance Manual for
specific starting instructions.
Engines t
hat 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 s
trap 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
groun
ded to the negative “-” battery terminal with
a wire that is adequate to handle the full charging
current of the alternator.
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4684
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.
The engine is controlled by a digital Pandoras
governor. The control system includes the following
components.
•
Control unit
•
Actuator
•
Setpoint adjus
ters (if equipped)
•
Sensors
•
Wiring Harness
System Description
The system is
controlled by an Electronic control Unit
(ECU). The ECU contains a microprocessor that has
an Electronic Programmable Read Only Memory
(EPROM). Th
e operating parameters for the governor
are stored in the EPROM. The actuator is connected
to the fuel injectors via a mechanical linkage.
A laptop computer is used to set the operating
parameters of the governor. The laptop computer is
connected
to the governor via an interface cable. The
operating parameters for the governor should only be
modified by a trained Perkins representative. Refer to
the Speci
al Instruction, “Pandoras Digital Governor”
for more information.
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