HARNESS AS-ENGINE 5201511 - Caterpillar

If the voltage rises above the "Generator Overvoltage Percentage Threshold" setpoint value, then the overvoltage timer will begin timing. When the timer expires, the generator overvoltage event is made active (if the voltage has been above the threshold level continuously while timing). If the voltage drops below the generator overvoltage percentage threshold, then the generator overvoltage event will be made inactive and the timer will be reset. If an overvoltage condition is detected, then "GEN OVERVOLTAGE SHUTDOWN" or "GEN OVERVOLTAGE " will be displayed on the EMCP 4 . This message is used to inform the operator of an overvoltage condition.Note: The severity of the overvoltage condition will determine if a warning or shutdown event occurs.Conditions Which Generate This Code:The code for generator overvoltage is generated when the EMCP 4 determines that a generator overvoltage condition has occurred.Test Step 1. TALK TO THE OPERATOR
Determine the conditions that caused the overvoltage condition. Expected Result:An overvoltage was caused by an occurrence that is known to the operator. The operator would like to place the generator set back into service.Results:
OK - The operator can determine the cause for the overvoltage condition. The condition has been repaired, and the operator wants to place the generator set back into service.Repair: Reset the generator set. Resume normal operation and verify that the problem has been corrected.STOP
NOT OK - The overvoltage condition was not caused by an occurrence that is known to the operator. Proceed to Test Step 2Test Step 2. CHECK THE SETPOINTS.
View the Generator Overvoltage 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 generator set.Repair: Reset the generator set. Resume normal operation and verify that the problem has been corrected.STOP
NOT OK - The setpoints are NOT correct.Repair: Reprogram the setpoints. Reset the generator set. Resume normal operation and verify that the problem has been corrected.STOPTest Step 3. VERIFY VOLTAGE CAN BE ADJUSTED (CDVR)Verify that the generator output voltage can be adjusted from the EMCP 4 display screen.Expected Result:The generator output voltage can be adjusted from the EMCP 4 display screen.Results:
OK - The generator output voltage can be changed from the EMCP 4 display screen.Repair: Adjust the generator output voltage to meet site requirements. Resume normal operation and verify that the problem has been corrected.STOP
NOT OK - The generator output voltage cannot be adjusted. Proceed to Test Step 4Test Step 4. CHECK CAT DATA LINK BETWEEN THE EMCP 4 AND THE VOLTAGE REGULATORRefer to the Electrical System Schematic for the Generator Set. Check the data link wiring between the EMCP 4 and the voltage regulator. For more information on troubleshooting the data link, refer to Troubleshooting , "Data Link Circuit Fault ".Results:
OK - The data link wiring is correct.Repair: Refer to the appropriate voltage regulator service manual and perform an operational check of the voltage regulator.