Komatsu 930E-2, Руководство по ремонту

Страница: 626 / 739

SCOREBOARD
Description
The Scoreboard from Komatsu Mining Systems uses
information from the Payload Meter to display the
current load. It uses ultra-high-brightness LED tech-
nology to form 3 digits. The sign is fully sunlight read-
able and housed in a rugged steel enclosure.
The Scoreboard displays each swing pass as the truck
is being loaded. As the truck drives away, the sign will
display the last swing pass until the final load calcula-
tion is made. It will then switch to display the final load
calculation and hold it until the truck dumps. The sign
will then clear for the empty ride back to the shovel.
Making Connections
The Scoreboard connects to the RS232 port on the
Payload Meter. It must share this connection with other
dispatch systems like Modular Mining as well as the
PC download connection. This sharing of the single
port creates special circumstances when using a Per-
sonal Computer or dispatch system.
The Scoreboard is in constant communications with
the Payload Meter and must acknowledge every mes-
sage from the meter. In addition, the Scoreboard must
also signal the Payload Meter that it is ready to receive
messages by supplying a 5vdc signal over the CTS
line. Installations that include Modular Mining or other
dispatch systems must take over the responsibility for
acknowledging messages from the Payload Meter. To
do this, the return communications line and the CTS
line from the Scoreboard must be cut and taped back.
When this is done, the Scoreboard simply monitors
communications between the Payload Meter and
Modular Mining. The Modular Mining system acknow-
ledges each message from the meter.
Sharing this RS232 port with the Personal Computer
for downloading can also create problems with com-
munications. The Payload Meter can confuse mes-
sages from the PersonalComputer and Scoreboard.
To eliminate this problem, the Scoreboard must be
turned off during downloading of the Payload Me-
ter. Using the circuit breaker to turn off the main power
to the Scoreboard is the best way to accomplish this.
The power to the Scoreboard must be turned off before
communications between a Personal Computer and
the Payload Meter can start. Once the download proc-
ess is finished, the power needs to be restored to the
Scoreboard to keep from receiving F99 or F93 error
codes.
The harness for the Scoreboard supplies two extra
connections in the overhead compartment of the cab.
One is for the existing PC port and the other is for
Modular Mining.
When two Scoreboards are installed, the first sign
transmits load information and power to the second
sign. Note that the communications wire from the first
sign connects to terminal 35L7. This is the retransmit
terminal. This wire then connects to the 35L4 terminal
in the second sign. This is the receive terminal of the
second sign.
The Payload Meter must be set to use OP12 . Refer
to "Setting the Option Code" for instructions.
Once in this mode, the Payload Meter will look for the
Scoreboard and attempt to communicate with it. If
there are communications problems the Payload Me-
ter may indicate a communications port error. Refer to
"Fault Codes" for additional information.
Figure 20-15. Scoreboard
M20-28 Payload Meter II M20007 10/00