An engine oil pressure event can be generated by either the engine ECM or the EMCP 4, depending on the configuration of the EMCP 4. The engine oil pressure sensor can be configured for either datalink or sensor. If the oil pressure sensor is configured for datalink the oil pressure event can be generated by the engine ECM or the EMCP 4 or both. If the oil pressure sensor is configured for sensor the oil pressure event can be generated by one or more of the analog inputs.
Only low warning and low shutdown events are supported for engine oil pressure. If configured for datalink the engine ECM will monitor the oil pressure and send a message to the EMCP 4 over the CAN 1 datalink for low oil pressure warning and shutdown events. The low warning and shutdown thresholds in the engine ECM are non-configurable setpoints. If during the commissioning of a genset, or any other time, should the desire to test low oil pressure warning and shutdown arise the EMCP 4 can generate these events. The EMCP 4 will monitor and respond to setpoints for oil pressure even when the engine oil pressure sensor is configured for data link using the setpoints available in the engine oil pressure monitor menu.
With the engine oil pressure sensor configured for sensor, the oil pressure sensor must be connected to an EMCP 4 analog input. If the engine oil pressure sensor is configured for sensor and an analog input has not been configured for oil pressure an engine oil pressure input not configured warning will occur. Engine low oil pressure warning/shutdown and time delays are programmed through the analog input configuration menus when configured for sensor. You can program more than one analog input for the same data identification, or engine oil pressure for example. When two or more analog inputs configured for engine oil pressure exist, all warning and shutdown setpoints for each respective analog input will drive low engine oil pressure warning or shutdown. Low warning event threshold and low shutdown event threshold setpoint units in the analog inputs menu are fixed at kPa when the data identification is a pressure. To convert PSI to kPa, multiply the PSI value by 6.89. To convert bar to kPa, multiply the bar value by 100.
The EMCP 4 also includes setpoints for monitoring engine oil pressure while running at low idle. Whether or not the low idle setpoints are used to drive engine low oil pressure warning/shutdown depend on the low engine oil pressure step speed setpoint. When the engine speed is below this setpoint, the low idle setpoints are used for engine low oil pressure warning/shutdown. The low idle thresholds use the same delay setpoints that are used for the datalink low oil pressure setpoints.
The code for low engine oil pressure warning or low engine oil pressure shutdown is generated when the ADEM or EMCP 4 determines that the engine oil pressure has decreased below the low warning or shutdown threshold for the associated time delay. If the engine is operating below the low engine oil pressure step speed, low engine oil pressure warning/shutdown will be generated based on the low idle low engine oil pressure setpoints.
Test Step 1. View the EMCP 4 Event Log
- Press the "EVENT LOG" button located in the upper right corner of the EMCP 4 controller. Check the genset control log for the low engine oil pressure warning or shutdown.
Expected Result:
The event is located in the genset control log.
Results:
- YES - The event is located in the genset control log. Proceed to Test Step 2.
- NO - The event is NOT located in the genset control log.
Repair: The low engine oil pressure warning or low engine oil pressure shutdown is being generated by the engine ECM. Refer to the Troubleshooting manual for the engine.
STOP
Test Step 2. View the Setpoints
- Using Cat ET view the "Automatic Start/Stop > Engine Oil Pressure Sensor Configuration Setpoint". If Cat ET is not available refer to the Step B below. If Cat ET is available refer to Step C below.
- Using the EMCP 4 display, navigate to "MAIN MENU > CONFIGURE > ALL SETPOINTS > ENG MONITOR/PROTECT > ENG OIL PRES MON". A level 2 password is required to change the setpoints. View the engine oil pressure sensor configuration setpoint.
- If Cat ET is available, and the engine oil pressure sensor configuration setpoint is set to datalink, the low engine oil pressure warning or shutdown is based on the setpoints under the "ENG OIL PRES MON" submenu. 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.
- NOT OK - The setpoints are NOT correct.
Repair: Set the setpoints correctly.
STOP
Test Step 3. Verify which Analog Input is Programmed for Engine Oil Pressure
Note: It is possible to have multiple analog inputs programmed for engine oil pressure. Each analog input will drive low engine oil pressure warnings or shutdowns. If one or more analog inputs are configured for engine oil pressure, choose one for oil pressure and configure the other(s) as custom analog inputs, this will eliminate the problem of multiple analog inputs driving the same event.
- View the analog input 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.
- Verify that the analog input setpoints for oil pressure are correct. Low warning event threshold and low shutdown event threshold setpoint units in the analog inputs menu are fixed at kPa when the data identification is a pressure. To convert PSI to kPa, multiply the PSI value by 6.89. To convert bar to kPa, multiply the bar value by 100.
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, enter the setpoints in kPa. Reset the generator set. Resume normal operation and verify that the problem has been corrected.
STOP
Test Step 4. Verify the Oil Pressure Step Speed
- Verify that the low engine oil pressure step speed is set below the rated speed of the engine.
Results:
- OK - The setpoints are correct for your particular generator set.
Repair: Contact your Technical Communicator for a possible consultation with Caterpillar.
STOP
- NOT OK - The setpoints are NOT correct.
Repair: Reprogram the setpoints. Resume normal operation and verify that the problem has been corrected.
STOP