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OM5048 7/11
MAJOR COMPONENT DESCRIPTIONS
Truck And Engine
The 930E-4SE Dump Truck is an off-highway, rear
dump truck with AC Electric Drive. The gross vehicle
weight is 505 611 kg (1,114,670 lb). The engine is a
Komatsu SSDA18V170 rated @ 2 611 kW (3,500 HP).
Main Alternator
The diesel engine drives an in-line alternator at engine
speed. The alternator produces AC current which is
rectified to DC within the main control cabinet. The
rectified DC power is converted back to AC by groups
of devices called "inverters", which are also within the
main control cabinet. Each inverter consists of six
phase modules under the control of a gate driver power
converter (GDPC). The two GDPCs control the
operation of each phase module.
Each phase module contains paired positive and
negative semiconductor switches referred to as
insulated gate bipolar transistors (IGBT). The IGBTs
cycle on and off at varying frequencies to create an AC
power signal from the DC supply.
The AC power signal produced by each inverter is a
variable-voltage, variable-frequency (VVVF) signal.
Frequency and voltage are changed to suit the
operating conditions.
Cooling air for the control/power group and wheel
motors, as well as the alternator itself, is provided by
dual fans mounted on the alternator shaft.
AC Induction Traction Motorized Wheels
The alternator output supplies electrical energy to the
two wheel motors attached to the rear axle housing.
The motorized wheels use three-phase AC induction
motors with full-wave AC power.
The two wheel motors convert electrical energy back to
mechanical energy through built-in gear trains within
the wheel motor assembly. The direction of the wheel
motors is controlled by a directional control lever
located on the center console.
Suspension
®
Hydrair II
suspension cylinders located at each wheel
provide a smooth and comfortable ride for the operator
and dampens shock loads to the chassis during
loading and operation.
COMPONENTS & SPECIFICATIONS
Components & Specifications - Section 5
Operator's Cab
The operator cab has been engineered for operator
comfort and to allow for efficient and safe operation of
the truck. The cab provides wide visibility with an
integral
4-post
ROPS/FOPS
advanced analog operator environment. It includes a
tinted safety-glass windshield and power-operated side
windows, a deluxe interior with a fully adjustable seat
with lumbar support, a fully adjustable/tilt steering
wheel, controls mounted within easy reach of the
operator, and an analog instrument panel which
provides the operator with all instruments and gauges
which are necessary to control and/or monitor the
truck's operating systems.
Power Steering
The truck is equipped with a full time power steering
system which provides positive steering control with
minimum
operator
effort.
nitrogen-charged accumulators which automatically
provide emergency power if the steering hydraulic
pressure is reduced below an established minimum.
Dynamic Retarding
The dynamic retarding is used to slow the truck during
normal operation or control speed coming down a
grade. The dynamic retarding ability of the electric
system is controlled by the operator through the
activation of the retarder pedal (or by operating a lever
on the steering wheel) in the operators cab and by
setting the RSC (Retarder Speed Control). Dynamic
retarding is automatically activated, if the truck speed
goes to a preset overspeed setting.
Brake System
Service brakes at each wheel are oil-cooled multiple
disc brakes applied by an all-hydraulic actuation
system. Depressing the brake pedal actuates both
front and rear brakes after first applying the retarder. All
wheel brakes will be applied automatically if the brake
system pressure decreases below a preset minimum.
The parking brake is a dry disc type, mounted inboard
on each rear wheel motor, and is spring-applied and
hydraulically-released with wheel speed application
protection (will not apply with truck moving).
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structure
and
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The
system
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Troubleshooting
