Generac Power Systems 04390-1, 04456-1 Voltage Regulator Adjustment, 2 12 KW and 15 KW Units

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Section 2 — Post Installation Start-up and Adjustments

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

5.Turn the speed adjust nut to obtain a frequency reading of 63 Hz.

6.When frequency is correct at no load, check the AC voltage reading. If voltage is incorrect, the volt- age regulator may require adjustment.

Figure 2.3 — Engine Governor Adjustment

Idle Spring

Governor

Shaft

(Rotate

Clockwise)

Governor Clamp Bolt

No Load Idle

Adjustment Screw

 

6.Using a hand, push the governor arm to the closed throttle position. Make sure the idle spring does not stretch at all.

7.Restart the unit.

8.Slowly turn the idle adjust screw to adjust the no- load idle frequency to 63-63.5 Hz (with door open).

9.The governor is now set.

◆2.7.3 ADDITIONAL CORROSION PROTECTION

Periodically spray all engine linkage parts and brack- ets with corrosion inhibiting spray such as WD-40 or a comparable product.

2.8VOLTAGE REGULATOR

ADJUSTMENT

With the frequency between 62-63 Hertz, slowly turn the slotted potentiometer (Figure 2.5) until line volt- age reads 247-252 volts.

NOTE:

The access panel on top of the control panel must be removed to adjust the voltage regulator.

◆2.7.2 12 KW AND 15 KW UNITS

1.Loosen governor clamp bolt (See Figure 2.3).

2.Completely remove the idle spring.

3.With governor arm at wide open throttle position, rotate governor shaft fully clockwise. Tighten clamp bolt to 84 inch-pounds.

4.Start unit and apply full load. Use full load speed adjust screw (Figure 2.4) to adjust frequency to 58 Hz.

5.Remove load, stop engine, loosen the idle adjust screw and reconnect the idle spring.

Figure 2.4 — Full Load Speed Adjust Screw

Full Load Speed Adjust Screw

Figure 2.5 – Voltage Adjustment Potentiometer

NOTE:

The voltage regulator is housed above the genera- tor's control panel. The regulator maintains a volt- age in direct proportion to frequency at a 2-to-1 ratio. For example, at 62 Hertz, line-to-neutral voltage will be 124 volts.

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Contents Installation Authorized Dealer Location IntroductionIntroduction Inside Front Cover Post Installation Start-up AdjustmentsMaintenance TroubleshootingGeneral Hazards ‹ Standards Index Electrical HazardsUNPACKING/INSPECTION Protection SystemsSystem SET LED 7 kW, Single Cylinder GH-410 Engine Your GeneratorSpecifications ‹ 1.5.1 Generator‹ 1.5.2 Engine 1 7 KW, 410CC Engine Reconfiguring the Fuel SystemFuel Requirements Recommendations Fuel Consumption2.1 7 kW, 12 kW and 15 kW Units Transfer SwitchLocation GeneratorBattery Battery InstallationCheck Transfer Switch Operation Before Initial START-UPElectrical Checks Checking Automatic Operation Generator Tests Under LoadAdjusting the Regulator Natural GAS only Engine Governor Adjustment1 7 KW Units 2 12 KW and 15 KW Units Voltage Regulator Adjustment‹ 3.2.1 Auto Position BREAK-IN ProcedureAutomatic Transfer Operation ‹ 3.2.3 Manual PositionManual Transfer Operation Sequence of Automatic Operation‹ 3.7.2 High Temperature Switch Setting the Exercise Timer‹ 3.5.2 Transfer Back to Utility Power Source ‹ 3.7.1 LOW OIL Pressure SwitchChecking the Engine OIL Level Approximate Crank Cycle Times‹ 3.7.4 Overspeed ‹ 4.3.1 Engine OIL Recommendations ‹ 4.3.2 OIL Change ProcedureChanging the Engine OIL Changing the OIL FilterSpark Plugs Battery MaintenanceCooling System Adjusting GH-410/GT-990 Valve ClearanceCorrosion Protection OUT of Service Procedure‹ 4.12.1 Removal from Service ‹ 4.12.2 Return to ServiceSYSTEM/COMPONENT Procedure Frequency Service ScheduleProblem Cause Correction Troubleshooting GuideElectrical Data Customer Battery Utility Battery Charger Utility Connection BCR Customer Connections Neutral Exploded Views and Parts Lists Part NO.QTY. Description Exploded Views and Parts Lists QTY Description Exploded Views and Parts Lists BOX GTS Load Center Exploded Views and Parts Lists COVER, 12 Position GTS Load Center Kit Contains BUSHING, Governor Lower 138 122 KNOB, AIR Cleaner 28 31 ADAPTOR, Engine Exploded Views and Parts Lists Stator 12KW Exploded Views and Parts Lists ASSEMBLY, Connecting ROD Exploded Views and Parts Lists SCREW, Taptite M6-1.0X8 Yellow Chrome Engine only Mounting Dimensions Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators Your Warranty Rights and Obligations MANUFACTURER’S Emission Control System Warranty CoveragePURCHASER’S/OWNER’S Warranty Responsibilities Emission Related Parts Include the Following Emission Control System WarrantyThis Warranty Shall not Apply to the Following Warranty Schedule

04389-1, 04456-1, 04390-1 specifications

Generac Power Systems is synonymous with reliable and innovative power solutions for both residential and commercial applications. Among its diverse product lineup, the Generac 04390-1, 04456-1, and 04389-1 stand out due to their robust features, advanced technologies, and user-focused characteristics.

The Generac 04390-1 is a portable generator designed for versatility and efficiency. It is equipped with a powerful OHV engine that enables it to deliver up to 3500 running watts and 4375 starting watts, making it suitable for various applications, such as home backup during outages or powering tools on job sites. The generator features a built-in PowerRUSH technology, which provides a 40% more starting capacity than traditional models, allowing it to handle more demanding appliances and tools simultaneously. Additionally, its lightweight and compact design enhance portability, complemented by a sturdy handle and flat-free wheels.

Moving on to the Generac 04456-1, this model offers a greater output with 7500 running watts and 9400 starting watts. Ideal for larger homes or work environments, it is powered by a heavy-duty, 420cc engine and designed for optimal performance. The unit incorporates an electric start feature for easy operation and includes a low-oil shutdown system that protects the engine from damage, providing peace of mind to users. The reinforced roll-cage design ensures durability, while its quiet operation keeps noise levels to a minimum, making it suitable for more noise-sensitive environments.

Lastly, the Generac 04389-1 generator is particularly characterized by its dual-fuel capability, allowing users to run it on either gasoline or propane. This flexibility ensures seamless operation in various situations, with 5500 running watts on gasoline and 4950 running watts on propane. The model’s advanced engineering includes an easy-to-read fuel gauge, ensuring that users can monitor fuel levels without hassle. This generator is also equipped with a heavy-duty, full-wrap steel frame for resistance against impacts and wear, making it perfect for outdoor use.

Collectively, the Generac 04390-1, 04456-1, and 04389-1 models embody a commitment to quality and innovation. With their powerful engines, enhanced technologies, and user-friendly features, these generators provide peace of mind through reliable power solutions, catering to a multitude of needs for both residential and commercial users alike. Whether for emergency backup or regular use, Generac’s offerings ensure that power is always on hand when it’s needed the most.
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