Komatsu 830E, Shop Manual

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E02016 2/02 Electrical Propulsion Components E2-3
FL275 PANEL
The FL275 electronic card panel contains a micropro-
cessor (CPU), a small computer which monitors a vari-
ety of input signals and establishes certain controlling
output signals which result in the regulation of the pro-
pulsion system. If a “laptop” computer, referred to as a
Portable Test Unit (PTU) is connected, it can also pro-
vide a readout of the “memory” of the operating history
of many of the sub-systems which make up the control
system. This is useful to technicians looking for prob-
lem areas during troubleshooting.
Setting up new trucks or making changes to truck con-
trol system parameters requires a PTU and an autho-
rized technician to operate it. The microprocessor in
the electronic card panel can only be changed elec-
tronically with appropriate commands and programs
using the PTU.
Previous control systems provided on Komatsu trucks
required system adjustments to be made by removing
the plug-in control cards and adjusting potentiometers
mounted on the cards. With the FL275 panel, no con-
trol card removal is required. The majority of adjust-
ments are made electronically using a menu driven
software program installed on the hard disk drive of the
“laptop” computer (PTU). The PTU is then connected
to a 9 pin connector mounted in the control cabinet or
cab of the truck enabling communication with the
microprocessor (CPU).
The FL275 panel has five 104-pin connectors mounted
above the cards for connecting input and output cir-
cuits. They are identified as CNA, CNB, CNC, CND
and CNE. Only four connectors are used; connector
CNC is not used.
The cards in this panel are protected by a cover which
is hinged at the bottom, swings up, and latches at the
top.
The card complement of the FL275 panel consists of
the following five cards:
•
17FB100 - Power Supply (P1)
•
17FB101/144* - Central Processing Unit (CPU)
•
17FB102/140** - Analog Input/Output (A1)
•
17FB103 - Digital Input/Output (D1)
•
17FB104 - Digital Input/Output (D2)
NOTES:
* Later model trucks, shipped July 2001 and later are
equipped with a 17FB144 card, replacing the 17FB101
card.
** Trucks equipped with “Fuel Saver” circuitry require
17FB140 card to replace 17FB102 card.
The FL275 panel receives input signals from speed
sensors on the alternator and wheelmotors, voltage
and current feedback signals from various control
devices, and command inputs from the operator. Using
these inputs, it provides the following:
•
Propulsion and dynamic retarding control of the
truck.
•
Speed restrictions during overspeed and other
operating restrictions if faults occur.
•
Event data for technicians through the 2-Digit
Diagnostic Display panel.
•
Statistical data of the history of various compo-
nent and system function operations, accessi-
ble only with a PTU.
It is also capable of receiving inputs from the engine
(oil pressure, crankcase pressure, engine coolant pres-
sure, and engine coolant temperature), wheelmotor
temperature, and alternator blower pressure to provide
warning signals to the driver if malfunctions in these
areas occur.
Additionally, on current production trucks (equipped
with “Fuel Saver”), the FL275 panel monitors alternator
intake temperature and static exciter temperatures to
provide:
•
Engine low idle speed reduced to 650 RPM.
•
Control of engine RPM during propel to obtain
the most efficient engine speed for the amount
of power requested by the operator.
•
Control of engine RPM during retarding ranging
from a low of 1250 RPM to a high of 1650 RPM.