Section 7

DIAGNOSTIC TESTS

9.Connect the meter test leads across Stator lead 11P and frame ground. “Infinity” should be read.

10.Connect the meter test leads across Stator lead 33 and frame ground. The reading should be “Infinity”.

11.Connect the meter test leads across Stator leads Wire 11P and Wire 33. The reading should be “Infinity”.

12.Connect the meter test leads across Stator leads Wire 11P and Wire 66. The reading should be “Infinity”.

13.Connect the meter test leads across Stator leads Wire 33 and Wire 66. The reading should be “Infinity”.

14.Connect the meter test leads across Stator leads Wire 11P and Wire 2. The reading should be “Infinity”.

15.Connect the meter test leads across Stator leads Wire 33 and Wire 2. The reading should be “Infinity”.

RESULTS:

1.If the Stator passes all steps except Step 7, repair, re-connect or replace Sensing leads 11S and 22S.

2.Replace the Stator if it’s power windings fail the test. (Note Result No. 1).

3.If the Power Windings test good, perform the “Insulation Resistance Test” on Page 13.

Figure 7-6. – Stator Power Winding Leads

TEST 9- CHECK BRUSH LEADS

DISCUSSION:

In Test 4, if application of battery voltage to the Rotor did NOT result in an output of about one-half rated voltage, the brush leads could be one possible cause of the problem. This test will check Wires 4 and OK for an open circuit condition.

PROCEDURE:

1.Set a VOM to its “Rx1” scale and zero the meter.

2.Disconnect Wire 4 from the Voltage Regulator and from the Rotor brush terminal.

3.Connect the VOM test leads across each end of the wire. The meter should read “Continuity”.

4.Disconnect Wire OF from the Rotor Brush Terminal. Connect one meter test lead to Wire OF. Connect the other test lead to a clean frame ground. The meter should read “Continuity”.

RESULTS:

1.Repair, reconnect or replace any defective wire(s).

2.If wires check good, go to Test 10.

Figure 7-7. – Brush Leads

TEST 10 - CHECK BRUSHES & SLIP RINGS

DISCUSSION:

Brushes and slip rings are made of special materials that will provide hundreds of hours of service with little wear. However, when the generator has been idle for some time, an oxide film can develop on the slip rings. This film acts as an insulator and impedes the flow of excitation current to the Rotor.

If Test 4 resulted in less than one-half rated output voltage, it is possible that the brushes and slip rings are at fault.

PROCEDURE:

1.Gain access to the brushes and slip rings.

2.Remove Wire 4 from the positive (+) brush terminal.

3.Remove the ground wire (0F) from the negative (-) brush.

4.Remove the brush holder, with brushes.

5.Inspect the brushes for excessive wear, damage, cracks, chip- ping, etc.

6.Inspect the brush holder, replace if damaged.

Page 43

Page 44 Page 46
Page 45
Image 45
Generac Power Systems 55, 75, 65 manual Test 9- Check Brush Leads, Test 10 Check Brushes & Slip Rings
Page 44 Page 46

65, 75, 55 specifications

Generac Power Systems has established itself as a leader in power generation, offering a range of high-performance generators suited for residential and commercial applications. Among its lineup, the Generac 55, 65, and 75 kW generators stand out for their reliability, efficiency, and advanced features.

The Generac 55 kW generator is designed to provide a powerful backup solution for medium to large homes or small businesses. It features a robust engine that delivers dependable performance while maintaining fuel efficiency. One of its key characteristics is the True Power Technology, which produces clean and stable power, ensuring that sensitive electronic devices run smoothly without risk of damage. This generator is equipped with a fully automatic transfer switch, allowing for seamless power transition during outages, with minimal disruption.

Moving to the 65 kW model, it offers increased capacity while retaining the fundamental qualities of the 55 kW version. This unit is particularly suited for larger homes or commercial applications that require greater power demands. The 65 kW generator utilizes Generac’s G-Force engine, known for its durability and reduced maintenance needs. Advanced features such as remote monitoring capabilities allow users to check the generator's status from anywhere, providing peace of mind and convenience.

The 75 kW generator takes performance to the next level, making it ideal for even more significant power needs. It is engineered for both quiet operation and enhanced performance, accommodating a wide range of requirements from residential to larger commercial operations. The 75 kW model includes a full-load voltage regulation system that maintains stable power output under varying loads, safeguarding appliances and equipment.

All three models incorporate advanced air-cooled technology, which enhances their efficiency and operational lifespan. Additionally, their corrosion-resistant enclosures ensure durability even in harsh weather conditions, making them suitable for diverse environments. The intuitive LCD display on each unit provides critical information, including runtime hours and maintenance reminders, empowering users with easy access to the generator's performance data.

Overall, Generac Power Systems' 55, 65, and 75 kW generators represent a commitment to quality, reliability, and innovation in backup power solutions. They are designed to meet the demands of modern power consumption while ensuring peace of mind through robust engineering and advanced technology. Whether for home use or commercial applications, these generators provide an effective means to stay prepared for unexpected power outages.
Top Page Image Contents