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Engine Monitoring Parameters
Example: Coolant Temperature Derate/ Shutdown
Rated Hp = 400 Hp
Delta Hp = 240 Hp = 400 Hp - 160 Hp
217 F
(103 C)
223 F
(106 C)
75%
50%
25%
Derate Max (160 Hp) or 45 MPH
Shutdown occurs
20 Seconds After
Derate Max is reached
if Temperature remains
at of above 223 F(106 C)
Coolant Temperature
100%
Rated
Power
Check Engine Lamp "ON"
Warning Lamp Flash
(Warning Lamp Solid if
Warning Mode Selected)
160 Hp
Delta
Power
As Coolant temperature rises to 217 °F (103 °C) the
engine is derated by 25% of the Delta Hp. In this example
240 Hp x .25 = 60 Hp. The driver would have 340 Hp
available. If the driver reacted by downshifting, for
example, and the temperature did not rise, the power
would stay at this level.
However, if the coolant temperature continued to
increase, to 219 °F (104 °C) the driver would lose another
25% or 60 Hp and have 280 Hp in this example.
If the temperature continues to rise to 223 °F (106 °C) the
maximum derate would occur. In this example 100% of
the Delta Hp or 240 Hp. The truck would be limited to 160
Hp or 45 MPH (72.5 km/h) which ever occurs fi rst.
If Shutdown has been selected as the Engine Monitoring
Mode, and the temperature remained above 223° F (106°
C) the engine would shutdown 20 seconds after the
maximum derate had been reached. (Shutdown Mode is
not available for BrakeSaver equipped engines.)
Low Coolant Level - Coolant level is monitored if
an OEM sensor is installed and the coolant level
option is activated. To avoid “false alarms” a
warning delay or “debounce” period prevents the
system from warning the driver if the coolant level
fl uctuates rapidly, such as it could while travers-
ing bumpy terrain. Vehicle speed is limited during
the derate period following the warning if Derate
or Shutdown settings are programmed. If the low
coolant level persists the engine will shutdown if
the Shutdown mode has been selected.