PLATE 1348952 - Caterpillar

Default Settings
Derate - This is a reduction of engine horsepower in response to an abnormal operating condition.Setpoint - This is a specific value which can activate the following responses: warning, deration and shutdown. The setpoint can be a pressure, a speed, a temperature, or a voltage.Hysteresis - This is the change in the signal from a sensor that is tolerated by the ECM. This is the difference between the setpoint that activates a response and the value that deactivates the response. For example, a warning for low voltage can activate if a value below 20 volts is detected by the ECM. The voltage must rise to 22 volts in order to clear the warning. The hysteresis is the 2 volts that are above the 20 volts.Voltage
The ECM automatically warns the operator of low system voltage. The default settings that are programmed at the factory are listed in Table 1.
Table 1
Voltage Monitoring
Parameter Default Setting
Warning setpoint 20 volts
Warning delay 10 seconds
Hysteresis 2 volts
Security level No required password If the voltage is below 20 volts for 10 seconds, a warning will occur. To deactivate the warning, the voltage must rise above 22 volts.The setpoint can be programmed to a value between 20 and 22 volts.Engine Oil Pressure
The ECM automatically performs the following functions for low engine oil pressure:
Warning
ShutdownThe strategy is based on a map of the engine oil pressure versus the engine rpm. For engines that are rated up to 1300 rpm, see Illustration 1. For engines that are rated at 1301 rpm and above, see Illustration 2. The default settings that are programmed at the factory are listed in Table 2.
Table 2
Engine Oil Pressure
Parameter Default Settings
Upper oil pressure limit 175 kPa (25 psi)
Lower oil pressure limit 41 kPa (5.9 psi)
Hysteresis 40 kPa (5.8 psi)
Activation delay 10 seconds
Security level Required password
Warning setpoint Map
Warning delay 4 seconds
Shutdown setpoint Map
Shutdown delay 9 seconds
Illustration 1 g00570830
Map of the engine oil pressure versus the engine rpm for engines that are rated up to 1300 rpm
(Y) Engine oil pressure in kPa
(X) Engine rpm
(1) Hysteresis
(2) Minimum engine oil pressure
Illustration 2 g00592294
Map of the engine oil pressure versus the engine rpm for engines that are rated at 1301 rpm and above
(Y) Engine oil pressure in kPa
(X) Engine rpm
(1) Hysteresis
(2) Minimum engine oil pressureIf the engine oil pressure is below the minimum pressure for four seconds, a warning will occur. To deactivate the warning, the engine oil pressure must rise above the hysteresis that is set in the map.If the engine oil pressure is below the minimum pressure for nine seconds, a shutdown will occur.The map cannot be reprogrammed.High Coolant Temperature
The ECM will automatically perform the following functions for high coolant temperature:
Warning
Derating
ShutdownThe default settings that are programmed at the factory are listed in Table 3.
Table 3
High Coolant Temperature
Parameter Default Setting
Warning setpoint 102 °C (216 °F)
Warning delay 5 seconds
Derate setpoint 107 °C (225 °F)
Derate delay 30 seconds
Maximum time of derating 480 seconds
Hysteresis 5 °C (9 °F)
Security level Required password
Maximum derating 25%
Shutdown setpoint 107 °C (225