OM6009 8/11 Payload Meter III - Section 60
Page 60-3
Operator Switches
In addition to toggling through
warning screens and various
truck information, the operator
switches can be used to set, view
and clear the total load counter
and total ton counter of the
payload meter. It is also used to
enter the operator ID number (0-9999) and view the
suspension pressures and inclinometer.
The operator switches are two-way momentary
switches located on the lower left hand dash panel.
The arrow positions are used to step through the
different displays. The OK position is used to set the
operator ID or clear the load and total ton counters.
Normally, the inputs from the switches to the payload
meter are open circuit. For more information about
these switches, refer to Operator and Cab Controls,
Section 32, of this manual.
Speed Input
PLMIII uses a speed signal to calculate speed,
distance, and other performance data. This input is
critical to the proper operation of the system. PLMIII
receives this signal from the speedometer/load
display on the instrument panel. The same signal
displayed to the operator is used by the system.
Distance calculations are made based on the rolling
radius of the tires for a particular truck.
Body-Up Switch
The body-up input signal is received from a magnetic
switch located on the inside of the truck frame,
forward the pivot pin of the truck body. This is the
same switch typically used for input to the drive
system. When the body is down, the switch closes
and completes the circuit to 71-control power.
24VDC indicates that the body is down. Open circuit
indicates that the body is up.
Brake Lock Switch
The brake lock is used to lock the rear brakes on the
truck. It is necessary for the accurate calculation of
swingloads during the loading process. Without the
brake lock applied, the payload meter will not
calculate swingloads during the loading process.
Without the brake lock, the payload meter will
assume that the truck was loaded using a continuous
loader and flag the haul cycle record. All other
functions will be normal regardless of brake lock
usage. The brake lock input comes from the switch
located on the dash panel. The brake lock switch
connects the circuit to ground. Open circuit indicates
that the brake lock is off. Ground indicates that the
brake lock is on.
Payload Meter
The payload meter is housed in a black aluminum
housing. There is a small window on the face of the
unit. Status and active alarm codes can be viewed
through the window. During normal operation, a two-
digit display flashes 0 back and forth. Active fault
codes will be displayed for two seconds. These
codes are typically viewed using the laptop computer
connected to the serial communications port.
There is one 40-pin connector on the payload meter.
A jack-screw is used to hold the payload meter and
wire harness connector housings together. This
screw requires a 4mm or 5/32 in. hex wrench. The
tightening torque for this screw is 3 N•m (25 in lb).
Four bolts hold the payload meter housing to its
mounting bracket in the cab.
The circuit board inside the payload meter housing is
made from multi-layer, dual-sided surface-mount
electronics. There are no field serviceable
components inside. The electronics are designed to
withstand the harsh operating environment of the
mining industry. Opening the payload meter housing
will result in voiding the warranty.
Communications Ports
The payload meter has two RS232 serial
communications ports and two CAN ports.
Connections for the two serial ports are available
inside the payload meter junction box. The two CAN
ports are available for future electronics systems.
Serial port #1 is used to communicate with the
dashboard display. It is also used to connect to the
laptop computer. The display gauge will remain blank
when the PC is using the serial port. This port initially
operates with serial settings at 9600,8,N,1. These
settings change automatically to increase the
communications rate when the PC is using the port.
This serial port uses a 3-wire hardware connection.
Serial port #2 is used to communicate to other on-
board electronics like Modular Mining's Dispatch
®
system or the scoreboard from Komatsu. This port
uses a 3-wire hardware connection. Connections to
this serial port need to be approved by Komatsu.
Several protocol options are available and detailed
technical information is available depending on
licensing.
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