Komatsu 930E-2, Shop Manual

Page: 132 / 739

ELECTRICAL INTERFACE CABINET
The Electrical Interface Cabinet (1, Figure 3-3) is
mounted near the rear of the cab and on the left side
of the main electrical control cabinet. The cabinet
houses various components for the 24VDC circuits,
engine controls and the 17FL349, Truck Control Inter-
face Panel (TCI).
The following information describes the components
in the cabinet and their operation. Additional, detailed
information for operation and troubleshooting proce-
dures not included below can be found in Section “E”
of this manual, the engine manufacturer’s service pub-
lications and the appropriate G.E. publications. Refer
to Section “R” of this manual for system schematics.
Refer to Figure 3-3 for location of the following compo-
nents.
LUBRICATION SYSTEM TIMER
Automatic Lubrication System activation frequency
can be adjusted by removing the timer (4) cover and
selecting one of five different timing intervals available.
System “on” time is automatically determined by the
timer and is not adjustable.
Refer to Section “M” for additional automatic lubrica-
tion system details.
BAROMETRIC PRESSURE TRANSDUCER
The Barometric Pressure Transducer (9) monitors
barometric air pressure, providing a signal to the Truck
Control Interface panel (TCI) and Propulsion System
Controller (PSC).
SPECIAL INTERFACE MODULE
The Interface Module (2) receives a load curve (PWM)
signal from the engine controls and converts it to a 0
to 10 volt signal for use by the Propulsion System
Controller (PSC).
POWER DISTRIBUTION TERMINALS
A 24 VDC terminal (17) and a 12 VDC terminal (19) are
mounted on the left wall of the cabinet. These terminals
distribute battery voltage and 12 VDC for devices re-
quiring reduced voltage. This 24 VDC terminal is a
convenient test point for measuring battery voltage
during troubleshooting procedures.
TRUCK CONTROL INTERFACE PANEL
The Truck Control Interface Panel (TCI) (6, Figure 3-3)
is the main interface between truck systems and de-
vices and service personnel. This panel is used in
conjunction with the Diagnostic Information Display
(DID) located in the operator’s cab.
The TCI panel provides the following functions:
•
Communicates with the Propulsion System Con-
troller (PSC) to exchange propulsion control sys-
tem status and control data and to provide the PSC
with truck systems status data.
•
Communicates with the Diagnostic Information
Display (DID) to exchange PSC and/or TCI diag-
nostic and parameter data. Refer to Section “E” for
additional information.
•
Communicates with the Auxiliary Blower System
to exchange diagnostic data.
•
Communicates with a Portable Test Unit (PTU) to
exchange TCI PTU data.
•
Communicates with a Modular Mining Dispatch
System to exchange truck status data.
•
Monitors engine control system, payload informa-
tion, ambient and propulsion system temperature,
operator control inputs etc.
•
Controls the engine start sequence.
•
Provides signals to activate many of the cab
mounted warning lamps and gauges. Controls the
park brake solenoid.
•
Processes front wheel speed signals for the PSC
and speedometer.
CONTROL POWER RELAY
The Control Power relay (18) is energized when the Key
Switch and Control Power switch (located in the main
electrical cabinet) are turned on. When closed, the
relay connects the battery circuit (circuit # 11) to create
circuit # 71, the B+ source for many of the low voltage
system components.
CIRCUIT BREAKER PANEL
A panel (10) adjacent to the TCI panel in the Electrical
Interface Cabinet contains the cabinet service lights
on/off switch (1, Figure 3-4) and circuit breakers CB1
though CB12 (2). Refer to Circuit Breaker Chart at the
end of this Section for functions and circuits.
D3-6 24VDC System Components D03019 04/01