Guardian Technologies 004708-0, 004700-0 owner manual Additional Information, ‹ 2.9.3 Field Boost

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Section 2 – Operation

Recreational Vehicle Generator

‹2.9.3 FIELD BOOST

The Controller Circuit Board houses a field boost diode and resistor that are not part of the automatic choke circuit. These two components are part of a “field boost” circuit (Figure 2.3). During engine cranking only, a positive DC (battery) voltage is delivered through the diode, resistor, brushes and slip rings, to the generator rotor. Application of this voltage to the rotor “flashes the field” whenever it is started. Flashing of the field each time the generator starts makes sure that a sufficiently strong magnetic field is available to produce “pickup” voltage in the stator windings.

Figure 2.3 – Field Boost Circuit

The voltage regulator also incorporates a “voltage surge protection circuit.” This circuit prevents trou- blesome surges in the generator AC output voltage. Voltage surge is a common cause of damage to elec- tronic equipment.

2.10 ADDITIONAL INFORMATION

‹2.10.1 ATTENTION REQUIRED AFTER SUBMERSION

If the recreational vehicle generator has been sub- merged in water, it MUST NOT be started and oper- ated. Following any submersion in water, have an Authorized Service Dealer thoroughly clean and dry the generator.

‹2.10.2 OPERATION IN HIGH GRASS OR BRUSH

Never operate the generator while the vehicle is parked over high grass, weeds, brush, leaves or any other combustible substance. Such materials can ignite and burn from the heat of the exhaust system. The generator exhaust system becomes extremely hot during operation and remains hot for a long time after it has shut down.

‹2.9.4 OVERVOLTAGE PROTECTION

A solid-state voltage regulator (Figure 2.4) controls the generator’s AC output voltage. This regulator sup- plies an excitation current to the rotor. By regulating the rotor’s excitation current, the strength of its mag- netic field is regulated and, in turn, the voltage deliv- ered to connected electrical loads is controlled. When the AC frequency is 60 Hertz, voltage is regulated at 120 volts (voltage-to-frequency ratio is 2-to-1).

Figure 2.4 – Solid State Voltage Regulator

‹2.10.3 EFFECTS OF MOISTURE AND DIRT

Keep the generator set as clean and dry as possible. Protect the unit against excessive dust, dirt, corrosive vapors, road splash, etc. Permitting dirt and mois- ture to accumulate on generator windings will have an adverse effect on the insulation resistance of those windings.

When moisture is allowed to remain in contact with windings, some of the moisture will be retained in voids and cracks in the insulation. This causes a reduced insulation resistance and will eventually cause problems. Dirt will make the problem worse, since dirt tends to hold moisture in contact with windings. Salt (as from sea air) also will worsen the problem since it tends to absorb moisture from the air. Salt and moisture, when combined, form a good electrical conductor.

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Contents Air-cooled Recreational Vehicle Generators Authorized Service Dealer Location IntroductionPart II Installation Instructions Part Warning   Fire Hazards  Generator Identification Model Number Serial Number KW Rating Rated VoltageSafety SpecificationsGenerator Applicability ‹ 1.5.1 Fuel Requirements‹ 1.5.5 Generator Fuel ConsumptionEngine OIL Requirements ‹ 1.5.6 Emissions Compliance PeriodGenerator Control Panel Automatic ChokeBefore Starting the Engine Starting the Generator ‹ 2.4.2 Engine Lubrication‹ 2.4.3 Fuel Supply ‹ 2.4.4 Cooling and Ventilating AIRStopping the Generator Applying Loads to GeneratorDo not Overload the Generator Protection Systems Additional Information ‹ 2.9.3 Field Boost‹ 2.10.2 Operation in High Grass or Brush ‹ 2.9.4 Overvoltage ProtectionChecking the Engine OIL Level Changing the Engine OIL AND/OR OIL FilterMaintaining the Engine AIR Cleaner Clean AIR Intake‹ 3.3.1 Cleaning the Foam Precleaner Clean Spark Arrestor Cleaning the GeneratorFuel Filter Battery Maintenance OUT of Service Procedure‹ 3.12.1 Removal from Service Exercising the GeneratorAdjusting Valve Clearance RV Generator Service Interval‹ 3.12.2 Return to Service Recreational Vehicle Generator Part  General Hazards   Fire Hazards  Purpose and Scope Manual Equipment DescriptionStandards Booklets Major Features and Dimensions Drawing No D8716-H Location and Support ‹ 2.1.1 Generator Location‹ 2.1.2 Generator Support Generator Compartments ‹ 2.1.4 Generator Restraint‹ 2.2.2 Compartment Construction ‹ 2.2.1 Compartment Size‹ 2.2.4 Acoustics ‹ 2.2.3 Sound Insulating Materials‹ 2.2.5 Compartment Floor Cutouts ‹ 2.3.1 Generator AirflowCompartment Floor Cutout Drawing 0G3723-A ‹ 2.3.2 Testing the Installation Gasoline Fuel System‹ 2.4.1 Fuel Tank ‹ 2.4.2 Generator Fuel Supply LineExhaust System Flexible Fuel Line‹ 2.5.1 Spark Arrestor ‹ 2.5.2 Exhaust System Safety Electrical Connections‹ 2.6.5 Isolating Different Power Sources ‹ 2.6.6 Power Supply Cord‹ 2.6.4 Conduit Battery Installation ‹ 2.7.1 Recommended Battery‹ 2.7.2 Battery Cables Optional Accessories ‹ 2.7.4 Battery Compartment‹ 2.8.1 Remote START/STOP Panel Post Installation Tests Testing Under LoadBefore Initial START-UP Initial StartInstallation Checklist Troubleshooting Guide Problem Cause CorrectionElectrical Data Customer Supplied by Recreational Vehicle Generator Enclosure Drawing No D8352-M QTY Description Recreational Vehicle Generator Generator Drawing No D8353-M FAN, 8 Curve BLADE, 16.5MM I.D Exploded Views and Parts Lists QTY Exploded Views and Parts Lists GUARD, FAN Exploded Views and Parts Lists Long Block Assembly Your Warranty Rights and Obligations MANUFACTURER’S Emission Control System Warranty CoveragePURCHASER’S/OWNER’S Warranty Responsibilities Emission Control System Warranty Emission Related Parts Include the FollowingWarranty Schedule CONSUMER/PERSONAL Applications