PIN-COTTER 3B4627 - Caterpillar

System Operation Description:If the frequency drops below the generator under frequency percentage threshold set point value, then the under frequency timer will begin timing. When the timer expires, then the generator under frequency event is made active if the frequency has been below the threshold level continuously while timing. If the frequency rises above the generator under frequency percentage threshold, then the generator under frequency event will be made inactive. Timer will be reset. If an under frequency condition is detected, then "GEN UNDER FREQUENCY SHUTDOWN" or "GEN UNDER FREQUENCY " will be displayed on the EMCP 3. in order to inform the operator of an under frequency condition.Note: The severity of the under frequency condition will determine if a warning or shutdown event occurs.The code for generator under frequency is generated when the EMCP 3 determines that a generator under frequency condition has occurred.Test Step 1. TALK TO THE OPERATOR.
Determine the conditions that caused the under frequency condition.Expected Result:An under frequency condition was caused by an occurrence that is known to the operator. The operator would like to put the generator set back into service.Results:
OK - The operator can determine the cause for the under frequency condition. The condition has been repaired, and the operator wants to put 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 under frequency condition was not caused by an occurrence known to the operator. Proceed to Test Step 2.Test Step 2. CHECK THE SET POINTS.
View the generator under frequency and generator desired engine speed request set points. Make a note of the set points. Refer to Testing and Adjusting, RENR7902, "Electronic Control Module (Generator Set) - Configure". Compare the set points against the default set points of the particular generator set.Expected Result:The set points are correct.Results:
OK - The set points are correct for your particular generator set. Proceed to Test Step 3 for EUI engines. Proceed to Test Step 4 for MUI engines.
NOT OK - The set points are NOT correct.Repair: Reprogram the set points. Reset the generator set. Resume normal operation and verify that the problem has been corrected.STOPTest Step 3. VERIFY FREQUENCY CAN BE VIEWED AND ADJUSTED FROM THE EMCP 3. (EUI ENGINES ONLY)Verify that the generator output frequency can be viewed and adjusted from the EMCP 3 display.Expected Result:The generator output frequency can be viewed and adjusted from the EMCP 3 display.Results:
OK - The generator output frequency can be viewed and adjusted from the EMCP 3 display.Repair: Adjust the generator output frequency to meet site requirements. Resume normal operation and verify that the problem has been corrected.STOP
NOT OK - The generator output frequency cannot be adjusted. Proceed to Test Step 7.
NOT OK - The generator frequency reads zero on the EMCP 3 display. Proceed to Test Step 8.Test Step 4. CHECK THE SYSTEM BY USING THE SPEED POTENTIOMETER. (MUI ENGINES ONLY)
With the engine running, adjust the generator output frequency by turning the speed