Komatsu 830E-AC, Shop Manual

Page: 389 / 1085

E02020 10/06 Electrical Propulsion System Components E2-5
SYSTEM COMPONENTS
The ICP (Integrated Control Panel) consists of three
major components: the PSC (Propulsion System
Controller), the TCI (Truck Control Interface) and the
TMC (Traction Motor Controller).
Propulsion System Controller (PSC)
The PSC is the main controller for the AC drive
system. The ICP panel receives input signals from
speed sensors mounted on the alternator and
traction motors, voltage and current feedback signals
from various control devices, and status/command
inputs from the TCI. Using these inputs, the PSC
controls the two inverters, retarding circuits, relays,
contactors, and other external devices to provide the
following functions:
• Propulsion and wheel slip control
• Retarding and wheel slide control
• Engine speed control
• Event detection
• Initialization of the necessary operating
restrictions, including the shut down of the truck if
a serious system fault (event) is detected. If the
fault is not serious, an indicator lamp alerting the
operator to the problem will illuminate. All event
data is recorded for future review by maintenance
personnel.
• Log event data
• Store statistical data of the history of various
component and system function operations.
• Communicate with the TCI to exchange
propulsion system status and control data (event
data, statistical data, etc.) and to receive required
truck systems status data.
• Communicate with the TCI to exchange
propulsion Portable Test Unit (PTU) data
(propulsion real time, history, diagnostic, and
parameter data such as software code, etc.)
• Drive the operator cab status and warning lamps.
The PSC contains the following internal, removable
printed circuit boards and two fiber optic boards:
System CPU Card: Provides serial
communications and control functions, RS232
communications to PTU, and microprocessor
controls for internal panel circuits.
Digital I/O Card: Receives digital inputs and
feedback information from various propulsion
and control system components. Digital outputs
drive propulsion system contactors, relays and
provide equipment enable commands.
System Analog I/O Card: Receives engine,
voltage and current signals for the main
alternator, link voltage and current, retard pedal
input, and retard lever input. Controls retard
effort, engine speed request, and AFSE firing
pulses.
Inverter 1 & 2 CPU and I/O Cards (2 ea.):
Receives motor speed signals, link voltage,
phase voltages, and phase currents for
microprocessor control for inverters 1 and 2.
Controls IGBT phase modules through the fiber
optic assembly. Phase module status is returned
via a separate fiber optic assembly.
Fiber Optic Assembly: Provides electrical
isolation for control and feedback signals for
phase modules and chopper modules.