3512B Petroleum Engines Caterpillar

Note: The following information concerns engines with separate circuit aftercooling. For engines with jacket water aftercooling, monitoring of the aftercooler coolant temperature is disabled. However, the jacket water coolant temperature is monitored for all engines.

The ECM will automatically perform the following functions when high aftercooler coolant temperature occurs:

• Warning

• Derating

• Shutdown

The default settings that are programmed at the factory are listed in Table 1.

Table 1

Aftercooler Coolant Temperature
Parameter	Default Setting
Warning setpoint	102 °C (215 °F)
Warning delay	5 seconds
Derate setpoint	107 °C (225 °F)
Derate delay	5 seconds
Maximum time of derating	480 seconds
Hysteresis	3 °C (5.4 °F)
Security level	No required password
Maximum derating	25%
Shutdown setpoint	107 °C (225 °F)
Shutdown delay	5 seconds

If the aftercooler coolant temperature is above 102 °C (215 °F) for five seconds, a warning will occur. To deactivate the warning, the aftercooler coolant temperature must be below 99 °C (210 °F).

If the aftercooler coolant temperature is above 107 °C (225 °F) for five seconds, a derating will occur. The continuous schedule of the derating will reach 25 percent in 480 seconds.

When the aftercooler coolant temperature is less than 104 °C (220 °F), the percent of the derating is decreased until full power is restored. However, if the aftercooler coolant temperature rises above the setpoint again, the derating resumes.

If the aftercooler coolant temperature is above 107 °C (225 °F) for five seconds, a shutdown will occur.

Note: The default settings result in a shutdown that occurs before a derating. These settings are programmed because most customers prefer a shutdown for the aftercooler coolant temperature. The settings can be reprogrammed to different values.