PULLEY GP 1782492 - Caterpillar

Illustration 4 g00677748
Other Dynamics
The control can also compensate for nonlinear fuel systems and changes in the dynamics of an engine with a load. With the demand for fuel below the "Gain Slope Bk Pnt", the control uses the initial gain setting. As the demand for fuel increases above the "Gain Slope Break Point", the gain changes according to the adjustable "Gain Slope". Refer to Illustration 5. This provides satisfactory dynamics and smooth steady state operation for all conditions from no load to full engine load.
Illustration 5 g00677749
In addition to varying the gain with load and with load transients, an adjustable "Reset" and an adjustable "Compensation" are part of the dynamics of the control.Actuator Bump Function
The "Actuator Bump Function" will momentarily decrease the demand for fuel. The "Actuator Bump" function will determine if the control is controlling the engine and the driven equipment to the full extent. The function will provide the actuator with consistent changes in output. This change causes the engine speed to vary. This causes a response from the "PID". The response can be varied by using the appropriate dynamic adjustments. The "Actuator Bump" function is enabled in the "Actuator Bump" menu, and then activated in either "Dynamic Menu". The "Actuator Bump" function is only available for 60 minutes after the function has been enabled. The "Actuator Bump" function must be disabled in order to reset the 60 minute timer.Minimum Fuel Function
The "Minimum Fuel Function" brings the demand for fuel to zero. The demand for fuel is brought to zero when the discrete input "Open to Run" goes to the "TRUE" state. The demand for fuel is brought to zero when the following conditions occur:
Both of the inputs for the speed sensor have failed.
If the "Override Spd Fail" is in the "FALSE" state.The "Open to Run" command is the preferred means for a normal shutdown of the engine.Note: The "Open to Run" input is not intended for use as the main means of shutdown in any emergency stop. DO NOT use the "Open to Run" input as the main means of shutdown in any emergency stop.
The engine may overspeed due to incorrect assembly or adjustment.Engine overspeed could result in personal injury, loss of life and/or property damage.Be prepared to stop the engine by activating the engine shutdown system or closing the air inlet lines.
Maximum Fuel Function
The "Maximum Fuel Function" is a programmable maximum limit on the demand for fuel. This function is used to set the maximum position of the actuator. This is generally used to prevent the generator from overloading or other situations when the maximum fuel that is delivered to the engine should be limited. The function can be disabled by adjusting the Max Fuel Limit to 100 percent.Start Limit Function
The "Start Limit Function" provides a limit to the demand for fuel which prevents overfueling during starting of the engine. Refer to Illustration 6. During start-up, when the engine speed reaches five percent of rated speed, the "Start Limit" function is momentarily activated in order to