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Generac Power Systems 941-2, 940-2 service manual Troubleshooting, Symptoms of Stator Failure

Models: 941-2 940-2

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Section 1.5

COMPONENTS TESTING

INTRODUCTION

Problems that occur In the computer-controlled RV generator generally involve the following systems or components:

1.The engine.

2.The Speed Control System.

3.The AC Generator.

4.Battery Charge Circuit.

5.A6060 Circuit Board.

6.Wiring Harness and Front Panel.

This Section will discuss test procedures for the fol- lowing components. Also see Part 8 of this Manual,

"TROUBLESHOOTING".

1.The AC Generator (Stator).

2.Battery Charge Circuit.

3.A6060 Circuit Board.

STATOR ASSEMBLY

GENERAL:

For additional information on the Stator, refer to the following:

1."Stator Assembly" on Page 1.2-2.

2.Section 1.4, "INSULATION RESISTANCE".

SYMPTOMS OF STATOR FAILURE:

If the engine starts but the Stepper Motor does not move, and shutdown occurs after several seconds, look for broken or shorted timing windings (Wires TIM1 and TIM2).

TESTING THE STATOR WITH A VOM:

A Volt-Ohm-Milliammeter (VOM) can be used to test the Stator windings for the following faults:

•An open circuit condition.

•A "short-to-ground" condition.

•A short circuit between windings.

NOTE: The resistance of Stator windings Is very low. Some meters will not read such a low resis- tance and will simply Indicate "continuity" Recommended Is a high quality, digital type meter capable of reading very low resistances.

TESTING POWER PHASE WINDINGS:

A. Refer to Figures 1 and 2 on this page and the next. To test the Power Phase windings for an open circuit condition, proceed as follows:

1.Disconnect the following wires:

a.Lead "AC1" (Grey) at CB1A.

b.Lead "AC2" (Yellow) at BR1.

c.Lead "SL1 " (Orange) at CB1B.

d.Lead "SL2" (Brown) at BR3.

2.Make sure all of the disconnected leads are iso- lated from each other and are not touching the frame during the test.

3.Set a VOM to its "Rx1" scale and zero the meter.

4.Connect one test lead to AC1 and one test lead to AC2. Note the resistance reading.

5.Connect one test lead to SL1 and one test lead to SL2. Note the resistance reading.

NOMINAL RESISTANCE- POWER PHASE WINDINGS

0.414 to 0.465 ohm

Figure 1. Stator Leads

B. To test the Power Phase windings for a "short-to-ground" con- dition, proceed as follows:

1.Make sure all leads are Isolated from each other and are not touching the frame.

2.Set a VOM to its "Rx10,000" or "Rx1K" scale and zero the meter.

3.Connect one VOM test lead to the terminal end of Stator Lead "AC1”, the other test lead to a clean frame ground on the Stator.

a.The meter should read "infinity".

b.Any reading other than "infinity" indicates a "short-to-ground" condition.

c.Repeat #3 again using Stator Lead “SL1.”

Page 1.5-1

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Generac Power Systems 941-2, 940-2 service manual Troubleshooting, Symptoms of Stator Failure, Testing the Stator with a VOM
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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.