SEAL 1003091 - Caterpillar

System Operation Description:The EMCP 3 determines the engine speed, in rpm, from the magnetic pickup. The input from the magnetic pickup will be a frequency that is proportional to the engine speed and to the number of flywheel teeth. The EMCP 3 will convert the frequency of the engine speed sensor input into rpm based on the flywheel teeth set point value.The relationship between engine speed and generator frequency can be computed based on the number of generator poles. If the engine speed does not correspond to the generator frequency, "ENG SPEED-GEN FREQ MISMATCH WARN" will be displayed on the EMCP 3. The message informs the operator of the mismatch condition.Note: Refer to the engine Troubleshooting manual for more information regarding engine speed for your particular generator set.The engine speed warning code is generated when engine speed and frequency values mismatch by more than 10% for more than 10 seconds. If the set point for number of generator poles is set to a value of 0 poles, then the condition is not tested.Test Step 1. PERFORM THE INITIAL CHECK.
Check for active diagnostic codes on the engine ECM and the EMCP 3. If any codes are present, first correct the problems that caused the diagnostic codes.Expected Result:No other diagnostic codes or indicators are active.Results:
OK - No other diagnostic codes or indicators are active. Proceed to Test Step 2.
NOT OK - Another diagnostic code is active or an indicator is active.Repair: Exit this procedure. Troubleshoot the active code or indicator. Resume normal operation and verify that the problem has been corrected.STOPTest Step 2. CHECK THE SETPOINTS.
View the set points for the number of generator poles and flywheel teeth. 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.Repair: Reset the generator set. Resume normal operation and verify that the problem has been corrected.STOP
NOT OK - The set points are NOT correct.Repair: Enter the correct set points. Reset the generator set. Resume normal operation and verify that the problem has been corrected.STOP