0325625 JOHNSON KEEPER,Shift rod,upper

Table 1
Configuration Parameters for G3500A3 Engines
Parameter
Timing Control
"First Desired Timing"
"Second Desired Timing"
Air/Fuel Ratio Control
"Desired Oxygen at Full Load"
"Oxygen Feedback Feature Enabled Status"
"Air/Fuel Proportional Gain"
"Air/Fuel Integral Gain"
"Desired Fuel Valve Offset Position"
"Emissions Feedback Mode configuration"
"Desired Engine Exhaust NOx Level Setting"
"Air/Fuel Proportional Gain"
"Air/Fuel Intregal Gain"
Speed Control
"Low Idle Speed"
"Minimum Engine High Idle Speed"
"Maximum Engine High Idle Speed"
"Engine Acceleration Rate"
"Rated Engine Speed"
"Desired Speed Input Configuration"
"Governor Type Setting"
Engine Operation
"Engine Speed Droop"
"Governor Proportional Gain"
"Governor Integral Gain"
"Governor Derivative Gain"
"Auxiliary Proportional Governor Gain 1"
"Auxiliary Integral Governor Gain 1"
"Auxiliary Derivative Governor Gain 1"
"Speed Timing Map"
"Engine Load Timing Map"
Start/Stop Control
"Driven Equipment Delay Time"
"Crank Terminate Speed"
"Engine Purge Cycle Time"
"Engine Cooldown Duration"
"Cycle Crank Time"
"Engine Overcrank Time"
"Engine Speed Drop Time"
"Engine Pre-lube Time Out Period"
Engine Pre-Lube
Engine Load Calibration
"Full Load Intake Manifold (Absolute) Pressure"
"No Load Intake Manifold (Absolute) Pressure"
Monitoring and Protection
"High Inlet Air Temp Engine Load Set Point"
"Exhaust Temperature Installation Status"
Module Information
"Engine Serial Number"
"Equipment ID"
"Customer Password #1"
"Customer Password #2"
"Total Tattletale" Timing Control
The "Desired Timing" parameters allow the customer to program the timing of the ignition spark. The timing can be programmed to meet the needs for the specific applications and installation. The desired timing value can be changed while the engine is running or while the engine is stopped. The value that is entered for the desired timing is the ignition timing when the engine is operating at rated speed and at full load.Note: The actual ignition timing at a given instance may vary from the desired timing value. This variance is due to variations in the engine speed or the detonation.The range for programming the desired timing is 0 to 40 degrees before the top center (TC) position."First Desired Timing"
The "First Desired Timing" is determined with the methane number of the primary fuel that is used. Use the Engine Performance Sheet, "Fuel Usage Guide". The ECM selects the "First Desired Timing" when terminal J1-20 is not connected to ground."Second Desired Timing"
The "Second Desired Timing" is determined with the methane number of the alternate fuel that is used and the Engine Performance Sheet, "Fuel Usage Guide". The ECM selects the "Second Desired Timing" when terminal J1-20 is connected to ground. If an alternate fuel is not used, enter the same timing that was entered in the "First Desired Timing".Air/Fuel Ratio Control
Before the initial start-up, a current gas analysis is required. Periodic gas analyses are also recommended. Data from the gas analysis must be entered into Caterpillar Software, LERW4485, "Gas Engine Rating Pro (GERP)". The results are programmed into the ECM.Note: Use the Caterpillar Software, LERW4485, "Gas Engine Rating Pro (GERP)". Use of only the data from the gas analysis can result in incorrect settings.Oxygen Feedback
"Desired Oxygen At Full Load"
The ECM contains an oxygen map that is programmed at the factory. The "Desired Oxygen At Full Load" parameter is used to trim the oxygen map when the engine is in "Oxygen Feedback" mode. Increase the "Desired Oxygen At Full Load" parameter in order to lean the air/fuel ratio. Decrease the "Desired Oxygen At Full Load" parameter in order to richen the air/fuel ratio."Oxygen Feedback Enable Status"
The "Oxygen Feedback Enable Status" can be set to "Enable" or to "Disable". The engine will not operate in the "Oxygen Feedback" mode when the "Oxygen Feedback Enable Status" parameter is disabled. This feature allows the feedback mode to be disabled in order to troubleshoot. For example, the disabling of this feature can help determine whether the air/fuel ratio control is the cause of instability.If the signal from the oxygen sensor is not available, the engine control system cannot maintain consistent exhaust emissions.If there is a problem with the oxygen sensor, this parameter can be set to "Disable". Disabling the parameter allows the engine to run in the open loop mode until a new sensor is obtained. During operation in this mode, an emissions analyzer must be used to verify the emissions level. The "Fuel Quality" parameter is adjusted in order to adjust the air/fuel mixture.When the "Oxygen Feedback Enable Status" is enabled, adjustment of the "Fuel Quality" parameter does not affect the air/fuel ratio. Do not adjust the "Fuel Quality" parameter when the "Oxygen Feedback Enable Status" is enabled.Note: Do not operate an engine that is unattended in the open loop mode if the fuel has an LHV that is changing. The engine risks a shutdown due to lean misfire or to detonation."Air/Fuel Proportional Gain"
The "Air/Fuel Proportional Gain" determines the speed of the fuel metering valve response for the difference between the actual air/fuel ratio and the desired air/fuel ratio.The factory default setting is 0. This value should not require adjustment. If problems occur, the value is one of the last parameters that should be adjusted. The adjustable range is −50 to +50. Negative values reduce the speed of the fuel metering valve response and positive values increase the speed of the fuel metering valve response."Air/Fuel Integral Gain"
The "Air/Fuel Integral Gain" determines the response of the fuel metering valve to the error that is accumulated over time for the air/fuel ratio.The factory default setting is 0. This value should not require adjustment. If problems occur, the parameter is one of the last parameters that should be adjusted. The adjustable range is −50 to +50. Negative values reduce the response of the valve and positive values increase the response of the valve.Desired Fuel Valve Offset Position
Changing the parameter offsets the ECM command for the fuel valve position. The range for the offset is -20 percent to +20 percent. The offset is used to obtain the desired level of exhaust emissions when adjustment of the power screw is limited because of fuel quality or fuel supply.NOX Feedback
"Emissions Feedback Mode configuration"
The "Emissions Feedback Mode configuration" can be set to "NOx Feedback" or to "Feedback Disabled". The engine will not operate in the "NOx Feedback" mode when the "Emissions Feedback Mode configuration" parameter is disabled. This feature allows the feedback mode to be disabled in order to troubleshoot. For example, the disabling of this feature can help determine whether the air/fuel ratio control is the cause of inst