Generac 004373-1, 004626-0 Main Circuit Breaker, Engine Protective Devices, Specifications

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Section 1 — General Information

Guardian Liquid-cooled 40 kW Generator

1.5MAIN CIRCUIT BREAKER

The generator’s main circuit breaker is included with the unit as shipped from the factory. The breaker for each unit is described as follows:

Model Number

Circuit Breaker Rating

004373-1

200-amp breaker

004626-0

200-amp breaker

 

 

￿1.6.3 LOW COOLANT LEVEL SWITCH

Should the engine coolant level drop below the level of the high coolant temperature switch, it is possible for the engine to overheat without automatic shut down. To pre- vent such overheating without automatic shut down, the engine has a low coolant level sensor. If the engine coolant drops too low, the engine automatically shuts down (Figure 1.2).

1.6ENGINE PROTECTIVE DEVICES

The engine has several safety switches that cause it to automatically shut down under the following condi- tions: low oil pressure, high coolant temperature, low coolant level, engine overspeed and overcrank.

￿1.6.1 LOW OIL PRESSURE SWITCH

This switch is normally closed (N.C.) but is held open by engine oil pressure during engine running. Should oper- ating oil pressure drop below approximately 10 psi (68 kPa), the switch contacts close, and the engine shuts down automatically (Figure 1.2).

￿1.6.4 OVERSPEED SHUTDOWN

The control module assembly (CMA) circuit board on liquid-cooled units receives AC frequency (rpm) signals directly from the stator AC power windings. Should AC frequency exceed approximately 72 Hertz, circuit board action will automatically shut down the engine.

￿1.6.5 OVERCRANK SHUTDOWN

After 90 seconds of crank-rest cycles (about seven sec- onds cranking/seven seconds at rest), this function ends cranking if the engine fails to start in that 90-second span.

Figure 1.2 – Engine Protective Devices

￿ 1.6.6 DC FUSE

￿1.6.2 HIGH COOLANT TEMPERATURE SWITCH

This normally open (N.O.) thermostatic switch has a sensing tip that is immersed in captive coolant. Should the coolant temperature exceed approximately 121° C (250° F), the switch contacts close, which causes the engine to shut down automatically (Figure 1.2).

This fuse is located on the front panel of the control sys- tem. It protects the panel wiring and components from damaging overload. Always remove this fuse before commencing work on the generator. The unit will not start or crank if the fuse is blown. Replace the fuse with one of the same size, type, and rating. Generac uses an AGC fuse rated at 15 amps.

1.7 SPECIFICATIONS

1.7.1 GENERATOR

Models

004373-1 & 004626-0

Rated Maximum Continuous

 

AC Power Output (kW)*

 

40

Rated Voltage (volts)

 

120/240

Rated Maximum Continuous

 

Current at 240 Volts,

 

167

Single-phase (amps)

 

 

Number of Rotor Poles

 

4

Driven Speed of Rotor (rpm)

1,800

Type of Stator

 

Four-wire

Rotor Excitation System

 

Direct Excited

 

 

Brush-type System

Rotor and Stator Insulation

 

Class “H”

*Rated power of generator is subject to and limited by such factors as ambient tempera- ture, altitude, engine condition and other factors. Engine power will decrease about 3.5 percent for each 1,000 feet above sea level; and also will decrease an additional 1 percent for each 6° C (10° F) above 15.5° C (60° F) ambient. Maximum output power of the gener- ator is limited by maximum engine power.

Generac® Power Systems, Inc. 5

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Contents Power SYSTEMS, INC Authorized Dealer Location IntroductionSection Installation Drawings 56-57 Warranty Back Cover Safety Rules General InformationInstallation MaintenanceGeneral Hazards Electrical Hazards Automatic System Operation UNPACKING/INSPECTIONGenerator Generator AC Connection SystemsMain Circuit Breaker SpecificationsEngine Protective Devices Conversion to LP GAS Vapor Fuel Requirements RecommendationsGenerator and Load Compatibility EngineEmissions Control System CoolantAIR Fuel Ratio Controller Other Published Standards Standby Generator InstallationBasic Standby Electric System Nfpa StandardsEmergency Circuit Isolation Method Transfer Switch Start Signal ConnectionsGTS Type Switch Pre-Packaged Type SwitchPreparation Before START-UP Battery InstallationVented Batteries Prior to Initial START-UP Using the AUTO/OFF/MANUAL Switch Sequence of Automatic Operation OFF PositionManual Position Automatic Transfer OperationChecking the Engine OIL Level Weekly Exercise CycleEngine Oil Recommendations Oil and Filter Change ProcedureChanging the Engine AIR Cleaner Changing the Engine OIL and FilterSpark Plugs Battery MaintenanceDC Fuse Miscellaneous MaintenanceCleaning the Generator Overload Protection for Engine DC Electrical SystemRemoval From Service OUT of Service ProcedureReturn To Service SYSTEM/COMPONENT Procedure Frequency Service ScheduleProblem Cause Correction Troubleshooting GuideElectrical Data Section Power Systems, Inc Generac Power Systems, Inc Electrical Data Electrical Data Electrical Data Wiring Diagram DPE RED Brush UnitsPanel Face Part of Control Panel Wire Harness Switch Rocker Dpst 125V SPDSwitch TOG Dpdt 15/10 SP Switch Selector 6A AMP/VGenerators Cover Plate Egov CONTROLLER, B-C #DPG-2103Screen Cover Plate AVRCover Conn Housing Assembly Motor StepperConnector Interface Assembly Housing Governor ConnectDIRECT-COUPLED BASE, Mounting ASSEMBLY, 4.3LAssembly Groundwire 10/3/8 Plug Button 3 DIA4640 31 33 Pulley Tensioner Switch OIL PressureDC Alternator Assembly Engine 4.3L GMExploded Views and Parts Lists Connector C/C Vent Retainer Plug WiresRetainer Spark Plug Wires Wires Spark Plug 4.3LAdd item #42 vinyl trim as shown Carrier Rear Bearing FAN Assembly 390 SAE DDAssembly Brush & Shunt Assembly Scroll 390 SAEDuct Front Panel Assembly Cover AccessDuct Bottom Shakeproof INT M6 SSVenturi 16 DIA 35KW Tank Coolant RecoveryBracket Coolant Recovery Tank Radiator 14 FIN/INCHGasket Carburetor Adaptor Plate AIR Cleanr BottomPlate AIR Cleaner TOP Gasket AIR CleanerActuator Throttle 42MM Mixer only Natural GASNPT X Hose 1 in ID LP GASHose 1IN ID LP GAS Support Solenoid NAT GASNipple TOE 3/4 NPT X Nipple Pipe 3/4NPTX4.5 BLK IRNLUG Rngtng INS Regulator N/G R600SDECAL,INLET Pressure HOSE, Preformed Block Heater Hose Connection TEEHEATER, Engine 1800W HEATER, Engine 2000WCable Battery RED #1 X Battery 12VDC 90-AH 27F OptionalHold Down Battery Cable Battery Black #1 X11 12 Transformer 200A to 5A 5VA Cover Lower Connection BOXBushing Snap SB-2.5-31 Relay Solenoid 12VDC PNL MNTExploded Views and Parts Lists Shield Heat Crossover 4.3L Tube Straight a GroupMuffler Catalyst 4.3L Mounting Band A-GRP CatalystClamp Band Muffler Muffler 2-1/2 INLET/OUTLETGuardian Liquid-cooled 40 kW Generators Installation Drawings 12V Battery see Note Lifting EYE Places This Warranty Shall not Apply to the Following Warranty Schedule