MINEGEM Machine Control ; Guidance Products Local Area Radio Network Caterpillar

Illustration 1	g02144941
Loss of communication indications. Typical example.

If the Local Area Radio Network (LARN) does not operate correctly, the Strategic monitor will show red loss of communications indications.

In order to follow this procedure:

• Confirm the fault condition exists

• Identify the conditions that may generate the fault

• Eliminate faults in order of the general cause

Note: In general, faults are caused by problems in the following order: physical damage, environmental damage, harness failure, component failure and Electronic Control Module (ECM) failure.

Perform the following:

• Set up the Automation Operator Station and locate and sponsor a machine

ReferenceRefer to Operation and Maintenance Manual, "Setting Up for Operation".

ReferenceRefer to Operation and Maintenance Manual, "Preparing for Operation".

Test Step 1. Communications Loss on Machine Start.

1. Before entering the operations area, move the Barrier Control Panel (BCP) isolation switch to the OFF position. Attach a "Do Not Operate" warning tag or a similar warning tag to the personal lockout on the BCP isolation switch.

2. Check if the machine will start in manual mode from the machine operator station.

Expected Result:

The machine starts in manual mode.

Results:

• YES - The machine starts in manual mode Proceed to Test Step 2.

• NO - The machine will not start in manual mode.

  Repair: Check battery voltage. Charge or replace the battery as required or refer to Machine Automation System, Troubleshooting, Testing, and Adjusting, " Machine Will Not Start In Manual Mode - Test".

  STOP

Test Step 2. Operate the Machine in Manual Mode.

Operate the machine in manual mode for approximately 10 minutes and try to start again from the Automation Operator Station.

Expected Result:

The machine starts OK from the Automation Operator Station.

Results:

• YES - The machine starts OK from the Automation Operator Station.STOP

• NO - The machine will not start OK from the Automation Operator Station. Proceed to Test Step 3.

Test Step 3. Check Power Supply.

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Illustration 2	g02144515
Typical example (1) Onboard radio

1. Before entering the operations area, move the Barrier Control Panel (BCP) isolation switch to the OFF position. Attach a "Do Not Operate" warning tag or a similar warning tag to the personal lockout on the BCP isolation switch.

2. Check the power supply to Onboard Radio (1) .

Expected Result:

There is 24 VDC present at pin A of the 9-pin connector that connects to Onboard Radio (1) .

Results:

• YES - 24 VDC is present. Proceed to Test Step 4.

• NO - 24 VDC is not present.

  Repair: Using the schematic, check the continuity of 135-BU in the harness between the Automation Interface Control Module (ICM) and Onboard Radio.

  STOP

Test Step 4. Check the Onboard Radio Chassis Ground.

Check that Onboard Radio (1) has a chassis ground.

Expected Result:

There is continuity between pin B of the 9-pin connector that connects to Onboard Radio (1) and chassis ground.

Results:

• YES - There is continuity between pin B of the 9-pin connector that connects to the Onboard Radio and chassis ground. Proceed to Test Step 5.

• NO - There is not continuity between pin B of the 9-pin connector that connects to the Onboard Radio and chassis ground.

  Repair: Using the schematic, check the continuity of 200-BK in the harness between the Onboard Radio and chassis ground.

  STOP

Test Step 5. Check Status Indicators.

Illustration 3	g02144939
Partial view of onboard radio. Typical example. (1) Onboard radio (2) Radio activity indicator (3) Status indicator (4) Ethernet activity indicator

Illustration 4	g02144518
Typical example (5) Automation ECM (6) Front LADAR ICM Ethernet status indicator (7) Rear LADAR ICM Ethernet status indicator (8) Onboard radio Ethernet status indicator (9) Service port Ethernet status indicator (10) Automation ECM Ethernet status indicator (11) Automation ECM status indicator

Check Onboard Radio (1) status indicators and Automation ECM (5) status indicators.

Expected Result:

Ethernet activity status indicator (4) should be flashing on Onboard Radio (1) and Onboard Radio Ethernet status indicator (8) should also be flashing on Automation ECM (5) .

Results:

• YES - Status indicators are flashing. Proceed to Test Step 7.

• NO - Status indicators are not flashing. Proceed to Test Step 6.

Test Step 6. Check Ethernet Wiring.

1. Check Ethernet wiring between Automation ECM (5) and Onboard Radio (1) .

2. Use the schematic to check continuity of RU959-YL, RU960-BU, RU961-PU, and RU962-WH in the harness between Automation ECM (5) and Onboard Radio (1) .

Expected Result:

There is continuity in all Ethernet wires.

Results:

• YES - There is continuity in all Ethernet wires.

  Repair: Replace Onboard Radio (1) .

  STOP

• NO - There is not continuity in all Ethernet wires.

  Repair: Repair or replace the harness as required.

  STOP

Test Step 7. Check Coaxial Cables.

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Illustration 5	g02144519
Typical example (12) Machine Automation System (MAS) LARN antennae

1. Check the coaxial cables to MAS LARN antennae (12) .

Expected Result:

There is not continuity between the coaxial cable core and shield, no visible signs of damage and connectors are tight.

Results:

• YES - The coaxial cable is OK. Proceed to Test Step 8.

• NO - The coaxial cable is not OK.

  Repair: Replace the coaxial cable.

  STOP

Test Step 8. Check MAS LARN Antennae.

1. Check MAS LARN antennae (12) .

Expected Result:

There are no visible signs of damage and no continuity between the core and shield.

Results:

• YES - The MAS LARN antennae are OK.STOP

• NO - The MAS LARN antennae are not OK.

  Repair: Replace MAS LARN antennae (12) .

  STOP