PANEL GP-CIRCUIT BREAKER 3376395 - Caterpillar

Illustration 1 g00603288
Bus transformer box
Turn the ECS to "STOP".
Locate the input wires of the BTB +.
Start the engine and run the engine at rated speed.
Close the breaker in order to energize the bus.
Measure the voltage from phase A to phase C.Expected Result:The voltage should be the normal operating voltage.Results:
OK - The voltage is the normal operating voltage. Proceed to Test Step 3.
NOT OK - The voltage is NOT the normal operating voltage.Repair: There is no voltage on phase C. Use the System Schematic for the BTB + and the AC schematic in Testing And Adjusting, "Schematics And Wiring Diagrams" section to troubleshoot the wiring and find the exact cause of the diagnostic.STOPTest Step 3. CHECK THE VOLTAGE ON THE OUTPUT OF THE BTB+.
Stop the engine. Turn the ECS to "STOP".
Install cable probes on connector pins A and B of three terminal connector "J1" on the BTB+.
Start the engine and run the engine at rated speed.
Close the breaker in order to energize the bus.
Measure the voltage between connector pins A and B of "J1".Expected Result:The voltage should be equal to the voltage measured in Test Step 2 divided by 15 2% (14.7 to 15.3). Results:
OK - The voltage is correct. Proceed to Test Step 4.
NOT OK - The voltage is NOT correct. The BTB+ has failed.Repair: The BTB + has failed. Replace the BTB +. Refer to Testing and Adjusting, "EMPC Electronic Control (Bus Transformer Box) - Replace".STOPTest Step 4. CHECK THE INPUT WIRES OF THE GSC+P FROM THE BTB +.
Stop the engine. Turn the ECS to "STOP".
Locate the input wires on pin 17, and pin 18 of the GSC+P from the BTB +. Install cable probes on these pins.
Start the engine and run the engine at rated speed.
Close the breaker in order to energize the bus.
Measure the voltage between the GSC+P connector pin 17 and pin 18.Expected Result:The voltage should be equal to the voltage measured in Test Step 2 divided by 15 2% (14.7 to 15.3). Results:
OK - The voltage is correct. CID 1170 FMI 2 is still active. Repair: The GSC+P may have failed. It is unlikely that the GSC+P has failed. Exit this procedure and perform this entire procedure again. If the problem remains, replace the GSC+P. Refer to Testing And Adjusting, "EMCP Electronic Control (Generator Set) - Replace". STOP
NOT OK - The voltage is not correct. The wiring harness has failed between the BTB + and the generator.Repair: The wiring harness has failed between the BTB + and the generator. Repair the wiring harness or replace the wiring harness. Use the System Schematic for the BTB + and the AC schematic in the Testing And Adjusting, "Schematics And Wiring Diagrams" section.STOP