The GSC will shut down the engine during a engine overspeed fault. The GSC will shut down the engine or the GSC will sound the alarm during a low oil pressure fault. The programmed setpoint P03 determines the GSC response.
The GSC will shut down the engine or the GSC will sound the alarm during a high water temperature fault. Setpoint P03 determines the GSC response.
OP9 is only for verification of certain engine setpoints. OP5 is used for the actual programming of these setpoints. The setpoints that are verified by this procedure are listed below.
P03 Shutdown Override For Engine Fault - This action is the GSC response to a low engine oil pressure fault. This is also the GSC response to a high coolant temperature fault. The default setting from the factory is 0.
0 - engine shutdown
1 - alarm only (shutdown override)
P10 Engine Overspeed - P10 is the engine speed that is used by the GSC in order to declare that an engine overspeed fault exists. The setpoint for the engine overspeed for all 60 Hz applications is 1.18 times the rated speed. The range of values is from 50 to 4330 rpm. The value is set in increments of 10. The default setting from the factory is 2120 rpm.
P13 Low Oil Pressure Shutdown At Rated Speed - P13 is the selected oil pressure that is used by the GSC to declare that a low oil pressure shutdown fault exists. This setpoint is active with the engine at rated speed. Also, the engine speed must have exceeded the oil step speed for nine seconds. The range of values is from 34 to 420 kPa (5 to 61 psi). The value can be raised in increments of 1. The default setting from the factory is 205 kPa (30 psi).
Note: When oil pressure drops to 34 kPa (5 psi) of the P13 setpoint a low oil pressure alarm is issued by the GSC. If the generator is equipped, the optional alarm module issues an alarm also. The NFPA 99 remote annunciator will not issue an alarm.
P14 Low Oil Pressure Shutdown At Idle Speed - This setpoint tells the GSC when the GSC should declare that a low oil pressure shutdown fault exists with the engine at idle speed. The engine must have been running for at least nine seconds, and the engine speed must be less than the oil step speed. The fifth character of the model number specifies this setpoint. The default setting from the factory is 70 kPa (10 psi). The value is selectable from 20 to 336 kPa (3 to 50 psi) in increments of one.
Note: An oil pressure alarm is issued by the GSC when the oil pressure drops to 34 kPa (5 psi) of the P14 setpoint. When oil pressure is greater than the P14 setpoint, the GSC activates the EGR K1 relay. The GSC tells the electronic governor to go to the engine rated speed. When oil pressure is less than the P14 setpoint, the GSC deactivates the EGR K1 relay. The GSC tells the electronic governor to go to idle speed.
P15 High Water Temperature Shutdown - P15 is the coolant temperature that is used by the GSC to declare that a high coolant temperature shutdown fault exists. The fault is declared after a 10 second delay. The range of values is from 94° to 123°C (201° to 253°F). The value can be changed in increments of 1. The default setting from the factory is 107°C (225°F).
Note: When coolant temperature rises to 6°C (11°F) of the P15 setpoint, a high water temperature alarm is issued by the GSC. If the generator is so equipped the optional alarm module issues an alarm as well. The NFPA 99 remote annunciator will not issue an alarm.
The engine setpoints cannot be verified until the following conditions are met.
- The setpoints must be correct for the engine application. To view the setpoints, see Systems Operation, "Setpoint Viewing OP2". To program the setpoints, see Systems Operation, "Setpoint Programming OP5".
- When the operator is starting the engine, there should not be any faults. If necessary, troubleshoot and correct any fault.
Procedure For Overspeed Verification
- Start and run the engine at rated speed. Enter service mode. Enter the password. "OP 1" is showing on lower display. See Systems Operation, "Service Mode"for more information. See Systems Operation, "Password Entry OP3" for more information.
- Press "SCROLL UP" key eight times. "OP 9" is showing on the lower display.
- Press "SELECT" key. The value of overspeed setpoint P10 is showing on the upper display. "SC1" is showing on the lower display. "SC1" is followed by the present engine speed value.
- Press "SELECT" key. The setpoint value is flashing on the upper display.
- Decrease the value of the setpoint by pressing the "SCROLL DOWN" key. The value is flashing on the upper display. The default setting from the factory is 2120. The setpoint value decreases by 10 rpm with each press of the scroll down key. Continue pressing the key until the value of the setpoint is lower than the present engine speed value. The present engine speed value is showing on the lower display.
When the setpoint value is less than the present engine speed value, the engine shuts down. The indicator for engine overspeed will be flashing. The GSC is not in service mode.
Procedure For Low Oil Pressure Verification
Note: Service mode cannot be entered when the ECS is in the AUTO position.
- Start and run the engine at rated speed. Enter service mode and enter the password. "OP 1" is showing on lower display. See Systems Operation, "Service Mode" for more information. See Systems Operation, "Password Entry OP3" for more information.
- Press "SCROLL UP" key eight times. "OP 9" is showing on the lower display.
- Press "SELECT" key. The value of overspeed setpoint P10 is showing on the upper display. The default setting from the factory is 2120. "SC1" is showing on the lower display. SC1 is followed with the present engine speed value.
- Press the "SCROLL UP" key once. The value of the P13 setpoint for low oil pressure shutdown at rated speed is showing on the upper display. The default setting from the factory is 205 kPa (30 psi). "SC2" is showing on the lower display. SC2 is followed by the present oil pressure value.
- Press "SELECT" key. The setpoint value is flashing on the upper display. The default setting from the factory is 205 kPa (30 psi).
- Press the "SCROLL UP" key in order to increase the value of the setpoint. The setpoint value is flashing on the upper display. The setpoint value increases by five with each press of the "SCROLL UP" key. Continue pressing the key until the setpoint value increases past the present oil pressure. The present oil pressure value 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 will be flashing. The GSC is no longer in service mode.
Procedure For High Water Temperature Verification
Note: Service mode cannot be entered when the ECS is in the AUTO position.
- Start and run the engine at rated speed. Enter service mode and enter the password. "OP 1" is showing on lower display. See Systems Operation, "Service Mode" for more information. See Service Manual, "Password Entry OP3" for more information.
- Press "SCROLL UP" key eight times. "OP 9" is showing on the lower display.
- Press "SELECT" key. The value of overspeed setpoint P10 is showing on the upper display. The default setting from the factory is 2120. "SC1" is showing on the lower display. "SC1" is followed by the present engine speed value.
- Press "SCROLL UP" key two times. The value of the P15 setpoint for high water temperature shutdown is showing on the upper display. The default setting from the factory is 107°C (225°F). SC3 is showing on the lower display. SC3 is followed by the present coolant temperature value.
- Press "SELECT" key. The setpoint value is flashing on the upper display. The default setting from the factory is 107°C (225°F).
- Decrease the setpoint by pressing the "SCROLL DOWN" key. The value is flashing on the upper display. The setpoint value decreases by five degrees with each press of the "SCROLL DOWN" key. Continue pressing the key until the setpoint value decreases past the present coolant temperature value. The present coolant temperature value is showing on the lower display.
When the setpoint value is less than the present coolant temperature value, the engine shuts down. The indicator for high water temperature will be flashing. The GSC is no longer in service mode.