Kohler 24VDC, 6VSG, 36VDC, 48VDC Generator Set Operation, Theory of Operation, Prestart Checklist

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Section 2 Generator Set Operation

2.1 Theory of Operation

The generator set utilizes a permanent-magnet alternator to produce 3-phase AC voltage. This voltage is rectified using a full-wave 3-phase rectifier (single block rectifier for 36V and 48V, three individual rectifier blocks for 24V) to produce low-ripple DC output. See Figure 2-1and Figure 2-2.

The VSC measures the average DC voltage on the output and lists this on the auto-scrolling display, in the Overview menu and in the Generator metering menu.

KPS_105

Figure 2-1Basic VSG Power Connections

KPS_106

Figure 2-2Output Waveform, with Rectified Signal

The voltage is regulated to maintain a constant output voltage, which is equal to the System Voltage setting. When the load on the 6VSG generator increases, the generator controller increases the engine speed. The 6VSG series is designed to produce rated voltage at 2300 rpm with no load and at 2900 rpm when supplying full load. The output current and power increase with the engine speed. The engine speed is

limited to a maximum of 2900 rpm. See Section 3.14.1 for more information.

2.2 Prestart Checklist

To ensure continued satisfactory operation, perform the following checks or inspections before or at each startup, as designated, and at the intervals specified in the service schedule. In addition, some checks require verification after the unit starts.

Air Cleaner. Check for a clean and installed air cleaner element to prevent unfiltered air from entering the engine.

Air Inlets. Check for clean and unobstructed air inlets.

Battery. Check for tight battery connections. Consult the battery manufacturer’s instructions regarding battery care and maintenance.

Enclosure. Check that all enclosure panels and internal baffling are in place.

TP-6843 1/13

Section 2 Generator Set Operation 17

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Contents TP-6843 1/13a VSCController Identification Product Identification InformationGenerator Set Identification Numbers Engine IdentificationTable of Contents Appendix a Abbreviations Table of ContentsScheduled Maintenance Accidental Starting Safety Precautions and InstructionsBattery Exhaust System Engine Backfire/Flash FireFuel System Hazardous Noise Use extreme care when handling, storing, and using fuelsHot Parts Heavy EquipmentList of Related Literature IntroductionEmission Information NameplateService Assistance Service Assistance TP-6843 1/13 Introduction Engine Descriptions and Service ViewsGenerator Set Enclosure AlternatorCarburetor Heater AccessoriesOnCue Generator Management System Programmable Interface Module PIMService Views 3Optional Communications Kit Components Theory of Operation Prestart ChecklistGenerator Set Operation Generator Set Operation Exercising the Generator SetShutdowns FaultsExercise Fault Message ShutdownSD Condition Check Resetting the Controller After a Fault Shutdown5Controller Fault Messages Generator Set Operation TP-6843 1/13 VSC Generator Set Controller Control and IndicatorsVSC Controller Operation Controller Keypad LED IndicatorsLCD Display 6Autopaging Displays, Automatic ModeBattery Charging Controller PowerChanging Settings Procedure to Change Settings7Changing Settings Setting the Exerciser at Controller Power-up Setting the ExerciserChanging the Exercise Settings Procedure to Set the Exerciser8Procedure to Set the Exerciser on the VSC Controller Main Menu VSC Controller MenusEngine Metering Menu Overview MenuCalibration Generator Metering MenuGenset Run Time Menu Generator Set Information MenuGenset System Menu System Parameters for Battery Bank ChargingNominal Voltage 24V 36V 48V System Voltage, VDC Adjusting the Display Contrast Setting the ExerciserNetworking Information Menus Date and Time MenuDhcp Networking Status SubmenuPassword Networking Configuration Submenu OnCue PasswordRbus Rbus Information25Remote Devices Submenu Remote Devices SubmenuProgrammable Interface Module PIM Status Menu Event Log Procedure to View Event HistoryVSC Controller Operation TP-6843 1/13 Scheduled Maintenance Scheduled MaintenanceFuel Service Schedule, 6VSG ModelsLubrication System Oil Change ProcedureLow Oil Pressure Shutdown Oil CheckSpark Plugs Resetting the Maintenance TimerPaper Element Service Air Cleaner ServicePrecleaner Service Cooling System Engine Starting BatteryLubricating System Storage ProcedureFuel System Cylinder LubricationBattery Fault Messages TroubleshootingController Service Access IntroductionProblem Possible Cause Recommended Action TroubleshootingAbdc Appendix a AbbreviationsSysteme international d’unites TP-6843 1/13 Appendix Appendix TP-6843 1/13 Page 2012, 2013 by Kohler Co. All rights reserved