Electronic Modular Control Panel II+ (EMCP II+) Caterpillar

OP9 is the option for verifying that the EMCP II+ operates correctly when a fault occurs with low oil pressure, high coolant temperature or engine overspeed. An engine overspeed condition causes the GSC+ to shut off the engine. When a low oil pressure fault or a high water temperature fault is detected the GSC+ will shut off the engine or the GSC+ will sound the alarm according to the programmed setpoint P003. Setpoint P003 is the shutdown override setpoint for an engine fault.

OP9 is only for verification of certain engine setpoints. OP5-0 is used for the actual programming of these setpoints. The setpoints that are verified by this procedure are listed below.

P003 Shutdown Override For Engine Fault - P003 is the response by the GSC+ to a low engine oil pressure condition. P003 is also the response to a high coolant temperature fault. 0 is for engine shutdown. If P003 is set to 1 then the alarm responds only. The GSC+ will override engine shutdown. The default value for P003 is 0.

P010 Engine Overspeed - The GSC+ uses setpoint P010 in order to show an engine overspeed condition. The engine overspeed setpoint is 1.18 times the rated speed for all 60 Hz applications. The values vary from 500 to 4330 rpm. The values are changed in increments of 10. The default value for P010 is 2120.

P013 Low Oil Pressure Shutdown At Rated Speed - The oil pressure is used by the GSC+ to declare that a low oil pressure shutdown fault exists with the engine at rated speed. The speed must have exceeded the oil step speed setting for at least nine seconds. The values vary from 34 to 420 kPa (5 to 61 psi). The increments increase with a value of 1. The default value for P013 is 205 kPa (30 psi).

Note: When the oil pressure drops to a level that is within 34 kPa (5 psi) of the P013 setpoint, a low oil pressure alarm is issued by the GSC+ and the optional alarm module. The remote annunciator (NFPA 99) will not issue an alarm.

P015 High Water Temperature Shutdown - The coolant temperature is used by the GSC+ to declare that a high coolant temperature shutdown fault exists after a 10 second delay. The values vary from 85 to 123°C (185 to 253°F). The increments increase with a value of 1. The default value for setpoint P015 is 107°C (225°F).

Note: A high water coolant temperature alarm is issued by the GSC+ when the coolant temperature rises to a level that is within 6°C (11°F) of the P015 setpoint.

The following conditions are required before the engine setpoints are verified.

• The previously listed setpoints must be correct for the engine application. See System Operation, "Service Mode" in order to view a list of the setpoints. See System Operation, "Setpoint Programming OP5" in order to program the setpoints.

• The engine is checked at idle and rated speed. No faults should be present at the initial starting. If necessary, troubleshoot and correct any fault.

Procedure For Overspeed Verification

Note: Service mode cannot be accessed when the engine control switch (ECS) is in the AUTO position.

1. Start and run the engine at rated speed. Enter service mode and enter the password. "OP 9" is showing on the lower display. See System Operation, "Password Entry OP3".

2. Press the "SELECT" key. The value of the overspeed setpoint "P010" is showing on the upper display. The default value for P010 is 2120. "SC1" is showing on the lower display. "SC1" is followed with the present engine speed value.

3. Press "SELECT" key. The setpoint value is flashing on the upper display.

4. Decrease the setpoint value by pressing the "SCROLL DOWN" key. The default setpoint value is 2120. The default value is flashing on the upper display. The setpoint value decreases by 10 rpm with each press of the scroll down key. Press the "SCROLL DOWN" key until the setpoint value is past the present engine speed value that is showing on the display.

When the setpoint value is less than the present engine speed value, the engine will shut down. The engine overspeed indicator will flash. The GSC+ will no longer be in the service mode.

Procedure For Oil Pressure Verification

Note: Service mode cannot be entered when the ECS is in the AUTO position.

1. Start the engine and run the engine at rated speed. Enter service mode and enter the password. "OP 9" is showing on the lower display. See System Operation, "Password Entry OP3" for more information about entering the password.

2. Press "SELECT" key. The value of the overspeed setpoint P010 is showing on the upper display. The default value for P010 is 2120. "SC1" is showing on the lower display. The present engine speed value is then shown on the display.

3. Press the "SCROLL UP" key once. The value of the P013 setpoint for low oil pressure shutdown at rated speed is showing on the upper display. 205 kPa (30 psi) is the default value. The present oil pressure value is shown on the display.

4. Press "SELECT" key. The setpoint value is flashing on the upper display.

5. The setpoint value that is flashing on the upper display is increased by pressing the "SCROLL UP" key. With each press of the "SCROLL UP" key, the setpoint value increases by five. Press the "SCROLL UP" key until the setpoint value is past the present value that is showing on the lower display.

When the setpoint value is greater than the present oil pressure value, the engine shuts down. The indicator for low oil pressure should be flashing. The GSC+ should not be in service mode.

Procedure for Verifying High Water Temperature

Note: Service mode cannot be entered when the ECS is in the AUTO position.

1. Start the engine and run the engine at rated speed. Enter service mode and enter the password. "OP 9" is showing on the lower display. See System Operation, "Password Entry OP3".

2. Press "SELECT" key. The value of overspeed setpoint "P010" is showing on the upper display. The default value of the overspeed setpoint is 2120. "SC1" is showing on the lower display. "SC1" is followed with the present engine speed value.

3. Press the "SCROLL UP" key two times. The value of the P015 setpoint for high water temperature shutdown is showing on the upper display. The default value for setpoint P015 is 107°C (225°F). "P015" is showing on the upper display. "SC3" is then shown on the lower display which is followed by the present coolant temperature value.

4. Press the "SELECT" key. The setpoint value is flashing on the upper display.

5. The setpoint value that is flashing on the upper display is decreased by pressing the "SCROLL DOWN" key. With each press of the "SCROLL DOWN" key, the setpoint value decreases by five degrees. Continue pressing the "SCROLL DOWN" key until the setpoint value decreases past the present coolant temperature value that is showing on the lower display.

The engine shuts down and the high water temperature indicator begins flashing when the setpoint value is less than the present coolant temperature value. The GSC+ is no longer in service mode.