SEAL 1547477 - Caterpillar

System Operation Description:If the current rises above the "Generator Reverse Power Percentage Threshold" setpoint value, then the reverse power timer will begin timing. When the timer expires, the generator reverse power event is made active (if the current has been above the threshold level continuously while timing). If the current drops below the generator reverse power percentage threshold, then the generator reverse power event will be made inactive and the timer will be reset. If a reverse power condition is detected, "GEN REVERSE POWER SHUTDOWN" or "GEN REVERSE POWER " will be displayed on the EMCP 4 in order to inform the operator of a reverse power condition.Note: The severity of the reverse power condition will determine if a warning or shutdown event occurs.Conditions Which Generate This Code:The code for generator reverse power is generated when the EMCP 4 determines that a generator reverse power condition has occurred. Test Step 1. TALK TO THE OPERATOR
Determine the conditions that caused the reverse power condition. Expected Result:A reverse power was caused by an occurrence known to the operator. The operator would like to put the genset back into service.Results:
OK - The operator can determine the cause for the reverse power 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.The genset operates normally.
NOT OK - The reverse power condition was not caused by an occurrence known to the operator. Proceed to Test Step 3Test Step 2. CHECK THE MEASURED VALUES
Check the displayed values on the controller for the following:
Voltage
Current
Power Expected Result:The generator set parameters are within ratings and the expected values.Results:
YES - The values are within ratings and the expected values. Proceed to Test Step 3.
NO - The values are NOT within ratings and the expected values.Repair: Check the sensing wiring.STOPTest Step 3. CHECK THE SETPOINTS
View the "Generator Reverse Power" 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 4.
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 4. CHECK THE POLARITY OF THE CURRENT TRANSFORMERS
Illustration 1 g00607036
(A) Current Transformer Polarity Dot
Press the STOP key in order to shut down the engine.
Check the polarity of the current transformers. The polarity dots on all of the transformers should be towards the genset. Both the primary and secondary of the CT's must be checked. Refer to Illustration 1. Expected Result:The polarity of the current transformers should be correct.Results:
OK - The polarity of the current transformers is correct.Repair: It is unlikely that the EMCP 4 has failed. Exit this procedure and perform this procedure again. If the diagnostic code is still present, then replace the EMCP