CAB AR-ENCLOSED ROPS 4939621 - Caterpillar

If the engine speed rises above the "Engine Overspeed Threshold" setpoint value, the engine overspeed event is made active. If an overspeed condition is detected, "ENGINE OVERSPEED SHUTDOWN" will be displayed on the EMCP 4 to inform the operator of an overspeed condition. The engine overspeed shutdown will always be a hard shutdown and may not be disabled.Conditions Which Generate This Code:The code for engine overspeed is generated when the EMCP 4 determines that an engine overspeed condition has occurred.Test Step 1. TALK TO THE OPERATOR
Determine the conditions that caused the overspeed condition. Expected Result:An overspeed was caused by an occurrence known to the operator. The operator would like to place the genset back into service.Results:
OK - The operator can determine the cause for the overspeed condition. The condition has been repaired and the operator wants to put the genset back into service.Repair: Reset the genset. Resume normal operation and verify that the problem has been corrected.STOP
NOT OK - The overspeed condition was not caused by an occurrence known to the operator. Proceed to Test Step 2Test Step 2. CHECK THE SETPOINTS.
View the "Engine Speed Monitor" and "Generator Desired Engine Speed Request" setpoints. Make a note of the setpoints. Refer to Testing and Adjusting, "Electronic Control Module (Generator Set) - Configure". Compare the setpoints against the default setpoints of the particular generator set. Expected Result:The setpoints are correct.Results:
OK - The setpoints are correct for your particular genset. Proceed to Test Step 3 for EUI engines. Proceed to Test Step 4 for MUI engines
NOT OK - The setpoints are NOT correct.Repair: Reprogram the setpoints. Reset the genset. Resume normal operation and verify that the problem has been corrected.STOPTest Step 3. VERIFY ENGINE SPEED CAN BE VIEWED AND ADJUSTED FROM THE EMCP 4 (EUI ENGINES ONLY)Verify that the engine speed can be viewed and adjusted from the EMCP 4 display screen.Expected Result:The engine speed can be viewed and adjusted from the EMCP 4 display screen.Results:
OK - The engine speed can be viewed and adjusted from the EMCP 4 display screen.Repair: Adjust the engine speed to meet site requirements. Resume normal operation and verify that the problem has been corrected.STOP
NOT OK - The engine speed cannot be adjusted. Proceed to Test Step 7
NOT OK - The engine speed reads zero on the EMCP 4 Display Screen. Repair: The engine speed sensor may have failed or requires adjustment. Refer to Testing and Adjusting, "Speed Sensor (Engine) - Adjust". If the problem remains, replace the engine speed sensor.STOPTest Step 4. CHECK THE SYSTEM BY USING THE SPEED POTENTIOMETER. (MUI ENGINES ONLY)
With the engine running, adjust the speed of the engine by turning the speed potentiometer. Expected Result:The engine can be adjusted to the desired speed.Results:
OK - The engine speed can be adjusted.Repair: Adjust the engine speed to meet site requirements. Resume normal operation and verify that the problem has been corrected.STOP
NOT OK - The engine speed cannot be adjusted with the speed potentiometer. Proceed to Test Step 5Test Step 5. CHECK THE