3512B Petroleum Engines Caterpillar

High Coolant Temperature

Usage:

The ECM will automatically perform the following functions for high coolant temperature:

Warning
Derating
Shutdown

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

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Table 1
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	No required password
Maximum derating	25%
Shutdown setpoint	107 °C (225 °F)
Shutdown delay	5 seconds

If the coolant temperature is above 102 °C (216 °F) for five seconds, a warning will occur. The coolant temperature must be below 97 °C (207 °F) in order to deactivate the warning.

If the coolant temperature is above 107 °C (225 °F) for 30 seconds, a derating will occur. A continuous 25 percent derating is reached in 480 seconds. When the coolant temperature is less than 102 °C (216 °F), the percent of the derating decreases. The percent of the derating decreases until the capability of providing full power is restored. However, if the coolant temperature rises above the setpoint again, the derating will resume.

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

Note: The default setting for the delay of the derating is programmed to the maximum value of 30 seconds. The delay for the shutdown is five seconds. These settings result in a shutdown that occurs before a derating. These settings are programmed because most customers prefer a shutdown for high coolant temperature. The settings can be programmed to different values.

The setpoint can be programmed in the range of 90 to 102 °C (194 to 215 °F).