Section 3

INSULATION RESISTANCE TESTS

CAUTION!: Some generators may use epoxy or polyester base winding varnishes. Use solvents that will not attack such materials.

Use a soft brush or cloth to apply the solvent. Be care- ful to avoid damage to wire or winding insulation. After cleaning, dry all components thoroughly using mois- ture-free, low-pressure compressed air.

DANGER!: DO NOT ATTEMPT TO WORK WITH SOLVENTS IN ANY ENCLOSED AREA. PRO- VIDE ADEQUATE VENTILATION WHEN WORKING WITH SOLVENTS. WITHOUT ADE- QUATE VENTILATION, FIRE, EXPLOSION OR HEALTH HAZARDS MAY EXIST . WEAR EYE PROTECTION. WEAR RUBBER GLOVES TO PROTECT THE HANDS.

CLOTH OR COMPRESSED AIR:

For small parts or when dry dirt is to be removed, a dry cloth may be satisfactory. Wipe the parts clean, then use low pressure air at 30 psi (206 Kpa) to blow dust away.

BRUSHING AND VACUUM CLEANING:

Brushing with a soft bristle brush followed by vacuum cleaning is a good method of removing dust and dirt. Use the soft brush to loosen the dirt, then remove it with the vacuum.

STATOR INSULATION RESISTANCE

GENERAL:

Insulation resistance is a measure of the Integrity of the insulating materials that separate electrical wind- ings from the generator's steel core. This resistance can degrade over time due to the presence of conta- minants, dust, dirt, grease and especially moisture).

The normal Insulation resistance for generator wind- ings is on the order of “millions of ohms” or “megohms”.

When checking the insulation resistance, follow the tester manufacturer's Instructions carefully. Do NOT exceed the applied voltages recommended in this manual. Do NOT apply the voltage longer than one

(1) second.

CAUTION!: DO NOT connect the Hi-Pot Tester or Megohmmeter test leads to any leads that are routed into the generator control panel. Connect the tester leads to the Stator or Rotor leads only.

STATOR SHORT-TO-GROUND TESTS:

See Figure 3-2. To test the Stator for a short-to- ground condition, proceed as follows:

1.Disconnect and Isolate all Stator leads as follows:

a.Disconnect sensing leads 11S and 22S from the voltage regulator.

b.Disconnect excitation winding lead No. 6 from the voltage regulator.

c.Disconnect excitation lead No. 2 from the excitation circuit breaker (CB3).

d.Disconnect battery charge winding leads No. 66 and 77 from the battery charge recti- fier (BCR).

e.Disconnect battery charge winding lead No. 55 from the battery charge resistor (R1).

f.At the main circuit breakers, disconnect AC power leads No. 11P and 33.

g.At the 4-tab ground terminal (GT), discon- nect Stator power leads No. 22P and 44.

2.When all leads have been disconnected as outlined in Step 1 above, test for a short-to-ground condition as follows:

a.Connect the terminal ends of all Stator leads together (11S, 22S, 11P, 22P, 33, 44, 2,6, 55, 66, 77).

b.Follow the tester manufacturer's instructions carefully. Connect the tester leads across all Stator leads and to frame ground on the Stator can. Apply a voltage of 1500 volts. Do NOT apply voltage longer than one (1) second.

If the test Indicates a breakdown in Insulation, the Stator should be cleaned, dried and re-tested. If the winding fails the second test (after cleaning and dry- ing), replace the Stator assembly.

TEST BETWEEN ISOLATED WINDINGS:

1.Follow the tester manufacturer's instructions carefully. Connect the tester test leads across Stator leads No. 11P and 2. Apply a voltage of 1500 volts- DO NOT EXCEED 1 SECOND.

2.Repeat Step 1 with the tester leads connected across the fol- lowing Stator leads:

a.Across Wires No. 33 and 2.

b.Across Wires No. 11P and 66.

c.Across Wires No. 33 and 66.

d.Across Wires No. 2 and 66.

If a breakdown in the insulation between isolated windings is indicated, clean and dry the Stator. Then, repeat the test. If the Stator fails the second test, replace the Stator assembly.

Page 13

Page 14 Page 16
Page 15
Image 15
Generac Power Systems 55, 75, 65 manual Stator Insulation Resistance, Cloth or Compressed AIR, Brushing and Vacuum Cleaning
Page 14 Page 16

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