Generac Power Systems 009600-5, 009734-5 Protection Systems, High Temperature Switch, Field Boost

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Section 2 – Operation

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

2.7.2 DO NOT OVERLOAD THE GENERATOR

 

2.8.2 HIGH TEMPERATURE SWITCH

You can read the rated wattage/amperage capacity of your generator on the generator data decal (see Section 1.1 on Page 4).

Applying electrical loads in excess of the unit’s rated capacity will cause the engine/generator to automati- cally shut down.

To avoid overloading, add up the wattage of all con- nected electrical lighting, appliance, tool and motor loads. This total should not be greater than the gen- erator’s rated wattage capacity.

Most lighting, appliance, tool and motor loads indi- cate their required watts on their nameplate or data plate. For light bulbs, simply note the wattage rating of the bulb.

If a load does not show its rated wattage, multiply that load’s rated VOLTS times AMPS to obtain

WATTS.

Induction type motors (such as those that run the vehicle’s furnace fan, refrigerator, air conditioner, etc.) need about 2-1/2 times more watts of power for starting than for running (for a few seconds during motor starting). Be sure to allow for this when connecting electrical loads to the generator. First, figure the watts needed to start electric motors in the system. To that figure, add the run- ning wattages of other items that will be operated by the generator.

Do not apply heavy electrical loads for the first two or three hours of operation.

2.8PROTECTION SYSTEMS

2.8.1 LOW OIL PRESSURE SWITCH

This switch (Figure 2.3 on page 10) has normally open (N.O.) contacts that are held open by engine oil pressure during cranking and operating. Should oil pressure drop below a preset level, switch contacts close, and the engine automatically shuts down. The unit should not be restarted until oil is added.

This switch (Figure 2.3), which has normally open (N.O.) contacts, is mounted near the oil filter. The contacts close if the temperature should exceed approximately 284º F (140º C), initiating an engine shutdown.

Figure 2.3 – Low Oil Pressure and

High Temperature Switches

2.8.3 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 2.4). During engine cranking only, a positive DC (battery) voltage is deliv- ered through the diode, resistor, brushes and slip rings, and 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 2.4 – Field Boost Circuit

10 Generac® Power Systems, Inc.

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Contents Power SYSTEMS, INC Authorized Service Dealer Location IntroductionTable of Contents General Hazards Electrical Hazards Generator Identification Reference Number IdentificationInstallation SafetyGenerator Applicability Generator AC Connection SystemSpecifications Fuel Consumption gph/lbs.phFuel Requirements Engine OIL RequirementsGenerator Control Panel Optional Remote START/STOP Panel Automatic ChokeBefore Starting the Engine Stopping the Generator Starting the GeneratorEngine Exhaust GAS Letting the Engine StabilizeHigh Temperature Switch LOW OIL Pressure SwitchProtection Systems Field BoostChecking the Engine OIL Level Overvoltage Protection6 25-HOUR CHECK-UP 5 25-HOUR BREAK-IN PeriodMaintaining the Engine AIR Cleaner Cleaning the Foam PrecleanerChanging the Engine OIL AND/OR OIL Filter Clean AIR Intake Screen Checking the Engine Spark PlugSpark Arrestor Muffler Cleaning the Generator Battery MaintenanceWeekly Every SIX MonthsOUT of Service Procedure Drive BeltExercising the Generator Wattage Reference GuidePrimepact 66G and 66LP Recreational Vehicle Generators Part General Hazards Electrical Hazards Purpose and Scope Installation Instructions Standards BookletsEquipment Description Generator Engine Operating SpeedMajor Features and Dimensions Location and Support Generator SupportGenerator Location Suspended MountingGenerator Compartments Generator RestraintCompartment Construction Compartment SizeSound Insulating Materials AcousticsCompartment Floor Cutout Cooling and Ventilating AIR Compartment Floor CutoutsCooling AIR Inlet Openings Generator AirflowTesting the Installation Gasoline Fuel SystemCompensating for Restrictions LP GAS Fuel System Generator Fuel Supply LineParts not Included in Fuel System Primary Regulator Some Important ConsiderationsVapor Withdrawal Gaseous CarburetionExhaust System Fuel Supply LinesExcess Flow Valve Leakage TestsExhaust System Safety WiringElectrical Connections Type of Exhaust SystemBattery Installation Battery Cables 18 Transfer Switch Isolation MethodOptional Accessories Battery Cable ConnectionsBattery Compartment Remote Panel ModelsPost Installation Tests Testing Under LoadBefore Initial START-UP Initial StartInstallation Checklist Troubleshooting Guide Problem Cause CorrectionGenerac Power Systems, Inc Electrical Data Exploded Views and Parts Lists QTY Description To Engine BASE, Mounting To Engine BASE, Mounting To Engine Ground Item Part NO. QTY. Description Exploded Views and Parts Lists QTY Description Exploded Views and Parts Lists Carburetor Assemby CARB. V-TWIN L/P Primepact 66G and 66LP Recreational Vehicle Generators Primepact 66G and 66LP Recreational Vehicle Generators Primepact 66G and 66LP Recreational Vehicle Generators 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 FollowingGenerac Power SYSTEMS, INC