Generac 004373-1, 004626-0 OFF Position, Manual Position, Automatic Transfer Operation

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Section 3 — Operation

Guardian Liquid-cooled 40 kW Generator

￿3.2.2 “OFF” POSITION

This switch position shuts down the engine. This posi- tion also prevents operation.

￿3.2.3 “MANUAL” POSITION

Set the switch to Manual to crank and start the engine. Transfer to standby power will not automatically occur unless there is a utility failure.

With the switch set to AUTO, the engine may

!crank and start at any time without warning. Such automatic starting normally occurs when utility power source voltage drops below a preset level or during the normal exercise cycle. To pre- vent possible injury that might be caused by such sudden starts, always set the switch to OFF and remove the fuse before working on or around the generator or transfer switch. Then, place a “Do Not Operate” tag on the generator panel and on the transfer switch.

3.3 AUTOMATIC TRANSFER OPERATION

To select automatic operation, do the following:

1.Make sure the transfer switch main contacts are set to their “Utility” position, i.e., loads connected to the utility power source.

2.Be sure that normal utility power source voltage is available to transfer switch terminal lugs N1 and N2.

3.Set the generator’s Auto/Off/Manual switch to AUTO.

4.Set the generator’s main circuit breaker to its ON (or closed) position.

With the preceding steps complete, the generator will start automatically when utility source voltage drops below a preset level. After the unit starts, loads are transferred to the standby power source. Refer to “Sequence of Automatic Operation.”

3.4 SEQUENCE OF AUTOMATIC OPERATION

The generator’s control panel houses a control logic cir- cuit board. This board constantly monitors utility power source voltage. Should that voltage drop below a preset level, circuit board action will signal the engine to crank and start. After the engine starts, the circuit board signals the transfer switch to activate and connect load circuits to the standby power supply (load terminal lugs T1/T2 connect to terminal lugs E1/E2).

Upon restoration of utility source voltage above a preset level, generator circuit board action signals the transfer switch to transfer loads back to that power supply. After retransfer, the engine is signalled to shut down.

The actual sequence of operation is controlled by sensors and timers on a control logic circuit board, as follows:

A.Utility Voltage Dropout Sensor

This sensor monitors utility source voltage.

If utility source voltage drops below about 60 per- cent of the nominal supply voltage, the sensor ener- gizes a 15-second timer.

Once the timer has expired, the engine will crank and start.

B.Engine Warm-up Time Delay

This mechanism lets the engine warm up for about 10 seconds before the load is transferred to a stand- by source.

C.Standby Voltage Sensor

This sensor monitors generator AC output voltage. When the voltage has reached 50 percent of the nominal rated voltage, transfer to standby can occur.

D.Utility Voltage Pickup Sensor

This sensor monitors utility power supply voltage. When that voltage is restored above 80 percent of the nominal source voltage, a retransfer time delay starts timing.

E.Retransfer Time Delay

This timer runs for about 15 seconds.

At end of a 15-second delay, circuit board action de- energizes transfer relay in the transfer switch.

Retransfer to utility power source then occurs.

F.Engine Cool-down Timer

When the load is transferred back to utility power source, the engine cool-down timer starts timing.

The timer will run for about one minute, and the generator will then shut down.

3.5 ENGINE HEATER

This Generac standby generator comes equipped with a block heater (Figure 3.2, page 14) that is similar to the block heaters used in automotive applications.

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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 SystemsSpecifications Main Circuit BreakerEngine Protective Devices Conversion to LP GAS Vapor Fuel Requirements RecommendationsGenerator and Load Compatibility EngineCoolant Emissions Control SystemAIR 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 SwitchBattery Installation Preparation Before START-UPVented 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 SystemOUT of Service Procedure Removal From ServiceReturn 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 IRNRegulator N/G R600S LUG Rngtng INSDECAL,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