E2-6 Electrical Propulsion Components 2/02 E02016
Configuration Software - CFG
The CFG program is used to set values which are spe-
cific to a particular Komatsu truck model, such as
engine, alternator and wheelmotor configuration, retard
current limit, speed taper, power reference and control
stability constants.
The operating software that controls current, voltage
and horsepower limit in propulsion and current, speed
taper and field amps in retarding uses a set of con-
stants and look-up functions unique to and consistent
with the configuration on each Komatsu truck model.
The CFG program is also used to set values which are
specific to a particular mine, such as overspeed set-
tings.
“Configuration software”, also sometimes referred to as
“configuration download software”, allows the end user
(mine) or Komatsu Distributor to select, via an easy to
use, menu driven program screen, any one of a num-
ber of pre-recorded configurations stored in the PTU
software. All the user has to do is select the configura-
tion file that matches the truck being serviced.
The available combinations have been pre-recorded to
be consistent with and ensure proper limits on the com-
ponents used in that system. Thus, the Mine personnel
do not have to be concerned with questions such as:
“Is this the correct current limit for a GE776 or GE772
wheel?” or “Will speed taper in retarding work properly
if I use a wheel with 23:1 gear ratio?” The configuration
software will ensure compatible combinations of
parameters.
The Mine technician must select or create the correct
CFG file to match the truck.
The CFG program is downloaded to Flash chips on the
CPU card from CFG files on the PTU hard drive. This is
done initially during factory checkout, and can be
redone in the field using the PTU.
NOTE: This MUST be done if the FB101/144 card is
changed
PTU - Portable Test Unit Code
The PTU program is used to enable menu driven view-
ing of truck data in the CPU while the truck is moving or
stationary. Using the PTU, it can also be used to view
and change contactor positions.
It is also used to establish a communication link
between the PTU and the CPU to download OBJ and
CFG software files.
The PTU program is loaded onto the PTU hard drive
using GE/Komatsu supplied floppy disks. Instructions
for loading this software onto the PTU and download-
ing to the CPU are discussed later in this section.
System Regulation
The micro-processor, located on the CPU card
(17FB101 or 17FB144), in the FL275 panel is set up
electronically with the use of a Portable Test Unit
(PTU) when the software described previously is down-
loaded. After being set up, certain operating parame-
ters can be changed to “fine tune” the system to a
particular road profile.
In addition to establishing propulsion and retarding cir-
cuits and regulating truck speed and retarding, the soft-
ware restricts the control system from certain
transitions under certain conditions. For example, the
system will not allow a direction change while in the
retard or propulsion without passing through the
“nomo”, or “no motion” state. The software does,
however, allow transition among the three retard states
when in retard, these states being retarding, retard
speed control and overspeed. These transitions are
allowed because, once the contactors are in the retard
position, no other contactor changes are necessary.
NOTE: The term “nomo” is a state which is entered at a
truck speed of 0.30 mph or less.
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