Section 1.1

GENERATOR FUNDAMENTALS

3.When the generator circuit breaker is turned to the “ON” position, AC voltage is delivered to the Full Bridge Rectifier. The AC volt- age is rectified to DC and thus becomes DC Link voltage.

4.AC voltage from the stator PS1/PS2 is delivered to the inverter. This is used as the power supply for the inverter circuit board.

5.AC voltage from the stator TIM1/TIM2 is delivered to the system controller. This is used for engine speed sensing.

6.The system controller sends signals to the inverter for inverter operation.

7.The system controller senses load voltage and signals stepper motor operation to achieve required engine speed for correct voltage output.

WHY VARIABLE SPEED CONTROL?

Most electrical loads will operate satisfactorily only within a relatively small voltage band. In order to pro- vide useful voltage at larger load currents, it is neces- sary to increase engine speed.

In conventional AC generators, some form of voltage regulation is needed to provide correct voltage in the full range of load current. This is often accomplished by regulating excitation current to the Rotor (field) which then regulates the strength of the Rotor's mag- netic field. The voltage induced into the Stator wind- ings is proportional to the strength of the Rotor's mag- netic field.

The Impact Plus computer controlled generator uses a Rotor having a fixed and permanent magnetic field. The strength of this magnetic field is fixed and cannot be regulated.

The output voltage on Impact Plus computer con- trolled generators tends to droop with increasing elec- trical loads. The SYSTEM CONTROLLER maintains a constant AC output voltage by increasing engine and Rotor speed as the load current increases, to off- set this inherent voltage droop.

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Generac Power Systems 941-2, 940-2 service manual WHY Variable Speed CONTROL?
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941-2, 940-2 specifications

Generac Power Systems has established a strong reputation in the field of backup power solutions, particularly with its innovative products like the Generac 940-2 and 941-2 generator systems. These generators are designed to provide reliable power during emergencies, ensuring that homes and businesses can maintain operations seamlessly when grid power is disrupted.

One of the standout features of the Generac 940-2 and 941-2 models is their robust engine performance. Both generators utilize Generac’s patented engines, known for their durability and efficiency. These engines are built to withstand the most demanding conditions while providing a consistent power output. This reliability is crucial for users who depend on uninterrupted power supply for essential appliances and equipment.

In terms of technologies, the Generac 940-2 and 941-2 are equipped with advanced automatic transfer switch capabilities. This technology allows the generators to automatically start and supply power within seconds of an outage. This quick response time helps to ensure that critical systems remain operational without noticeable interruptions, which is vital for businesses and households alike.

Another important characteristic of these models is their user-friendly interface. The generators come with an intuitive digital controller that provides real-time information on power usage, system status, and maintenance needs. This technology makes it easy for users to monitor their generators and ensure they are always ready for an emergency.

The design of the Generac 940-2 and 941-2 also emphasizes noise reduction and aesthetic appeal. These units are engineered for quieter operation compared to traditional generators, making them suitable for residential areas. Their sleek appearance also fits well with modern home exteriors, enhancing rather than detracting from the property’s visual appeal.

Furthermore, these generators offer flexible fuel options, with the ability to run on natural gas or propane. This versatility allows users to choose the fuel source that best meets their needs, contributing to energy efficiency and lowering overall operating costs.

In summary, the Generac Power Systems 940-2 and 941-2 are exceptional generators that combine powerful performance with innovative technologies. Their automatic transfer switch capabilities, user-friendly controls, noise reduction features, and flexible fuel options make them an excellent choice for anyone seeking reliable backup power solutions. With these generators, users can rest assured knowing they have a dependable energy source ready when they need it most.
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