10116980 Mariner OWNERS GUIDE

Table 1
Configuration Parameters for G3520C and G3520E Engines
Timing Control
"First Desired Timing"
"Second Desired Timing"
Air/Fuel Ratio Control
"Fuel Quality Input Type Configuration" (1)
"Fuel Quality Sensor LHV Lower Limit" (1)
"Fuel Quality Sensor LHV Upper Limit" (1)
"Fuel Quality"
"Gas Specific Gravity"
"Fuel Specific Heat Ratio"
"Desired Emission Gain Adjustment Percentage"
"Air/Fuel Proportional Gain"
"Air/Fuel Integral Gain"
Speed Control
"Low Idle Speed"
"Minimum Engine High Idle Speed"
"Maximum Engine High Idle Speed"
"Engine Acceleration Rate"
"Desired Speed Input Configuration"
"Governor Type Setting"
"Engine Speed Droop"
"Governor Gain Factor"
"Governor Stability Factor"
"Governor Compensation Factor"
"Auxiliary Proportional Governor Gain 1"
"Auxiliary Integral Governor Gain 1"
"Auxiliary Derivative Governor Gain 1"
Start/Stop Control
"Driven Equipment Delay Time"
"Crank Terminate RPM"
"Engine Purge Cycle Time"
"Cooldown Duration"
"Cycle Crank Time"
"Engine Overcrank Time"
"Engine Speed Drop Time"
"Engine Pre-Lube Time Out Period"
Monitoring and Protection
"High Inlet Air Temp Engine Load Set Point"
"Impending Shutdown Delay Enable Status" (2)
"Impending Shutdown Delay Time" (2)
Power Monitoring
"Generator Output Power Sensor Scale Factor"
"Generator Output Power Sensor Offset"
"Engine Output Power"
"Engine Driven Accessory Load Configuration"
Information for the ECM
"Engine Serial Number"
"Equipment ID"
"Customer Password #1"
"Customer Password #2"
"Total Tattletale"
(1) This parameter applies to engines that are equipped with software that supports a remote fuel quality input.
(2) This parameter applies to engines that are equipped with software that supports impending shutdowns.Timing Control
The "Desired Timing" parameters allow the customer to program the timing of ignition in order to meet the needs for the application 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 P1-20 is an open circuit."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". When this input is connected to the digital return or to the − Battery, the engine control will use the "Second Desired Timing". 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."Fuel Quality Input Type Configuration"
Within the configuration screen for the master ECM, there are four parameters that relate to the fuel quality:
"Fuel Quality Input Type Configuration"
"Fuel Quality Sensor LHV Lower Limit"
"Fuel Quality Sensor LHV Upper Limit"
"Fuel Quality"Be sure that the configuration parameter for "Fuel Quality Input Type Configuration" is set for the proper system.The "Fuel Quality Input Type Configuration" can be set to one of the following values:
"Configuration"
"4-20 mA"When the "Fuel Quality Input Type Configuration" parameter is set to "Configuration", a fixed value must be set for the "Fuel Quality" parameter. Engines that run on a consistent fuel supply typically use this type of system. The "Fuel Quality Sensor LHV Lower Limit" and "Fuel Quality Sensor LHV Upper Limit" parameters are not available.When the "Fuel Quality Input Type Configuration" parameter is set to "4-20 mA", the ECM determines the LHV according to the signal from the fuel quality sensor. The "4-20mA" signal is provided by the customer via a sensor that measures fuel quality. The "Fuel Quality Sensor LHV Lower Limit" and "Fuel Quality Sensor LHV Upper Limit" set the lower limit and the upper limit of the LHV. Engines that run on an inconsistent fuel supply typically use this type of system. Engines that run on gas from a coal seam or landfill are examples of inconsistent fuel supply."Fuel Quality Sensor LHV Lower Limit"
This parameter is only available when the "Fuel Quality Input Type Configuration" is set to "4-20 mA".The ECM uses the value of this parameter to set the lower limit of the fuel LHV when the input signal is 4 mA. For example, if the value of this parameter is "300", the ECM will set the LHV to 300 when the input signal is 4 mA.The adjustable range is 100 to 650. The default is 250. The range between the "Fuel Quality Sensor LHV Lower Limit" and "Fuel Quality Sensor LHV Upper Limit" cannot exceed 600 BTU."Fuel Quality Sensor LHV Upper Limit"
This parameter is only available when the "Fuel Quality Input Type Configuration" is set to "4-20 mA".The ECM uses the value of this parameter to set the upper limit of the fuel LHV when the input signal is 20 mA. For example, if the value of this parameter is "900", the ECM will set the LHV to 900 when the input signal is 20 mA.The adjustable range is 500 to 1250. The default is 850. The range between the "Fuel Quality Sensor LHV Lower Limit" and "Fuel Quality Sensor LHV Upper Limit" cannot exceed 600 BTU.The ECM uses a linear scale between the lower limit and the upper limit. Refer to Illustration 1.
Illustration 1 g01110253
Example of LHV versus signal strength
(X) LHV
(Y) Signal strength in milliamperesIn this exampl