Protection Systems, ‹ 2.8.3 Field Boost

Section 2 – Operation

Recreational Vehicle Generators

2.7.2 DO NOT OVERLOAD THE GENERATOR

Read the rated wattage/amperage capacity of the gen- erator on the generator data decal (see Section 1.1).

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 generator’s rated wattage capacity.

•Most lighting, appliance, tool and motor loads indicate 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 genera- tor. 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) has normally closed (N.C.) 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.

2.8.2 HIGH TEMPERATURE SWITCH

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 270º F (132º C) for gasoline models, and 284° F (140° C) for LP models, 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 a diode, resistor, brushes, 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

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2.7.2 DO NOT OVERLOAD THE GENERATOR