Section 6.3

ENGINE CRANKING SYSTEM

INTRODUCTION

BATTERY

COMPONENTS:

The engine cranking system is shown schematically in Figure 1, below. The system consists of the follow- ing components:

A 12 volts Battery.

A Start-Run-Stop Switch (SW1).

A Starter Contactor (SC).

A Starter Motor (SM1).

A6060 Circuit Board.

Interconnecting wires.

OPERATION:

1.Holding the Start-Run-Stop switch (SW1) at "START" connects Wire 17 from the A6060 circuit board to frame ground.

a.A6060 circuit board action energizes a crank relay on the board after a three second delay.

b.Closure of the crank relay's contacts delivers 12 VDC to Wire 56 and to a Starter Contactor (SC). The Starter Contactor (SC) energizes and its contacts close.

2.Closure of the the Starter Contractor (SC) contacts delivers battery voltage to the Starter Motor (SM1). The Motor ener- gizes and the engine is cranked.

Figure 1. Schematic - Cranking Circuit

RECOMMENDED BATTERY:

The battery is generally supplied by the customer. Recommended is a battery that meets the following requirements:

Use a 12 VDC automotive type storage battery.

For prevailing ambient temperatures above 32° F. (0° C.), use a battery rated at 70 amp-hours and capable of delivering 360 cold-cranking amperes.

For prevailing ambient temperatures below 32° F. (0° C.), use a battery rated 95 amp-hours and capa- ble of delivering 450 cold-cranking amperes.

BATTERY CABLES:

Battery cables should be as short as possible and of adequate diameter. Cables that are too long or too small in diameter can result in voltage drop. The volt- age drop between battery terminals and the connec- tion point at generator should not exceed 0.121 volts per 100 amperes of cranking current.

The cables should be carefully selected based on (a) cable length and (b) prevailing ambient temperatures. Generally, the longer the cable and the colder the ambient temperature, the larger the required cable size. The following chart applies:

CABLE LENGTH

CABLE SIZE

Feet (Meters)

 

 

 

0 to 10 (0 to 3)

2*

 

 

 

11 to 15

(3.4-4.5)

0

 

 

 

16 to 20

(4.5 to 6)

000

* For warm weather use No. 2 cable up to 20 feet.

BATTERY CABLE CONNECTIONS:

1.Connect the cable from the large Starter Contactor (SC) lug to the battery post indicated by a POSITIVE, POS or (+).

2.Connect the cable from its FRAME GROUND connection to the battery post indicated by a NEGATIVE, NEG or (-).

(continued)

Page 6.3-1

Page 95
Image 95
Generac Power Systems 941-2, 940-2 Components, Operation, Recommended Battery, Battery Cables, Battery Cable Connections

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.