BASE AS 2379313 - Caterpillar

System Operation Description:If the frequency rises above the "Generator Overfrequency Percentage Threshold" setpoint value, then the overfrequency timer will begin timing. When the timer expires, the generator overfrequency event is made active (if the frequency has been above the threshold level continuously while timing). If the frequency rises above the generator overfrequency percentage threshold, then the generator overfrequency event will be made inactive and the timer will be reset. If an overfrequency condition is detected, then "GEN OVERFREQUENCY SHUTDOWN" or "GEN OVERFREQUENCY " will be displayed on the EMCP 4 in order to inform the operator of an overfrequency condition.Note: The severity of the overfrequency condition will determine if a warning or shutdown event occurs.Conditions Which Generate This Code:The code for generator overfrequency is generated when the EMCP 4 determines that a generator overfrequency condition has occurred. Test Step 1. TALK TO THE OPERATOR
Determine the conditions that caused the overfrequency condition. Expected Result:An overfrequency condition was caused by an occurrence that is known to the operator and the operator would like to put the genset back into service.Results:
OK - The operator can determine the cause for the overfrequency 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 overfrequency condition was not caused by an occurrence known to the operator. Proceed to Test Step 2Test Step 2. CHECK THE SETPOINTS.
View the Generator Overfrequency and Generator Desired Engine Speed Request setpoints. Make a note of the setpoints. See 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 FREQUENCY CAN BE VIEWED AND ADJUSTED FROM THE EMCP 4 (EUI ENGINES WHERE ADEM IS SET TO CAN)Verify that the