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20G11LC1K2JN0NNNNN — Detailed Product Overview, Technical Specifications, Applications, Advantages and Recommended Models

1. Product Overview

Model: 20G11LC1K2JN0NNNNN

Brand: Allen-Bradley

Product Series: PowerFlex 755

Product Family: PowerFlex 750-Series

Product Type: High-power air-cooled AC packaged variable frequency drive

The 20G11LC1K2JN0NNNNN is a large-frame AC variable frequency drive designed for high-power three-phase motor applications. It belongs to the PowerFlex 755 family and is intended for demanding industrial equipment where conventional low- and medium-power drives are not sufficient.

This model is configured for a 400 VAC, three-phase electrical system and uses a Frame 9 construction. The catalog configuration is an air-cooled packaged drive with an 800 mm deep MCC-style enclosure, Type 1 / IP20 protection, embedded EtherNet/IP capability, EMC filtering, AC input with precharge, no dynamic-braking transistor and no standard HIM keypad.

The model is particularly suitable for large pumps, fans, blowers, conveyors, compressors, process equipment, material-handling systems and other large rotating machinery.

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2. Basic Product Information

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3. Product Series

The 20G11LC1K2JN0NNNNN belongs to the PowerFlex 755 series.

The PowerFlex 755 family is designed for industrial variable-speed motor control and is particularly well suited to applications requiring relatively high power, flexible control and integration with an automation system.

The series is used across applications such as:

• Pumps
• Fans
• Conveyors
• Blowers
• Compressors
• Material handling
• Process machinery
• Large rotating equipment

The 20G11LC1K2JN0NNNNN represents a high-capacity configuration within this product family.

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4. Product Naming and Configuration

The model number contains a considerable amount of configuration information.

The important characteristics represented by this model include the following:

This configuration makes the model particularly appropriate for large centralized drive installations.

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5. Main Electrical Parameters

For actual drive selection, the motor nameplate current is particularly important.

A motor should not be selected only by comparing its nominal kW rating with the drive’s published kW rating.

Motor current, overload requirement, load type, acceleration requirement and operating conditions should all be considered.

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6. Power Rating

The drive has different power capacities depending on the duty classification.

The 710 kW normal-duty rating is especially relevant when comparing this model with other large industrial drives.

The 560 kW heavy-duty rating should be considered when the machine has a more demanding torque profile or requires greater overload capability.

The higher light-duty rating is more relevant to applications with a favorable load profile, such as certain variable-torque pump and fan applications.

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7. Current Rating

The model is identified with a 1175 A current class.

This is a very substantial current rating and places the drive in the high-power industrial category.

The current rating is especially important when selecting the drive for:

• Large motors
• Long conveyors
• Large pumps
• High-capacity fans
• Large blowers
• Process compressors
• Heavy industrial machinery

The actual motor full-load current should be checked carefully before installation.

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8. Physical Construction

The drive uses Frame 9 construction.

Frame 9 is intended for large industrial drive systems rather than compact machine-level installations.

The 800 mm specification refers to the cabinet-depth class.

The complete height and width should be taken from the final mechanical configuration rather than estimated from the model number alone.

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9. Dimensions and Weight

Because this is a large packaged Frame 9 drive, the final physical arrangement can affect the actual dimensions and weight.

For that reason, the safe engineering description is:

An exact weight should not be invented for a large configured drive.

The final equipment weight should be used for:

• Transportation
• Forklift selection
• Crane selection
• Foundation design
• Floor loading
• Cabinet installation
• Maintenance planning

This is particularly important for Frame 9 equipment because the complete packaged assembly is substantially larger than a small standalone inverter.

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10. Enclosure

The model uses a Type 1 / IP20 enclosure arrangement.

The enclosure is intended for an appropriate electrical installation environment.

It should not be regarded as a waterproof or outdoor-rated enclosure.

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11. Cooling System

The 20G11LC1K2JN0NNNNN uses forced-air cooling.

Because the drive controls a motor in the several-hundred-kilowatt range, heat management is an important part of installation planning.

The installation should provide adequate airflow.

The cooling intake and exhaust paths should remain unobstructed.

Hot air should not be allowed to circulate back into the drive cooling intake.

Periodic inspection of the cooling system is also recommended.

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12. Input and Precharge

The model uses an AC input with precharge.

Precharge is important for high-power drives because the DC-link capacitors represent a substantial electrical load when the drive is initially energized.

The precharge arrangement controls the initial charging process before normal operation.

For a drive of this size, the incoming electrical system should also be appropriately engineered for:

• Short-circuit current
• Disconnecting
• Protection
• Grounding
• Cable sizing
• Harmonic considerations
• EMC considerations
• Maintenance isolation

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13. Dynamic Braking

The specified configuration has:

Dynamic braking: None.

This is acceptable for many applications where the machine does not need rapid deceleration.

Typical examples include many large centrifugal pump and fan systems.

However, braking requirements should be reviewed for:

• High-inertia machines
• Rapid-cycle machinery
• Large conveyors
• Certain lifting systems
• Machines requiring fast stopping
• Machines with significant regenerative energy

If rapid deceleration is required, the braking arrangement needs to be evaluated separately.

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14. HIM Configuration

The model is configured as:

Blank / No HIM.

This means the drive does not include a standard local HIM keypad as part of the stated configuration.

This arrangement can be suitable when the drive is intended to be operated from a centralized PLC or HMI system.

Typical remotely controlled functions include:

• Start
• Stop
• Speed reference
• Speed feedback
• Current monitoring
• Frequency monitoring
• Fault monitoring
• Warning monitoring
• Drive status
• Diagnostic information

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15. Embedded EtherNet/IP

The model includes embedded EtherNet/IP capability.

This is useful for integrating the drive into a plant-wide automation system.

A PLC or supervisory controller can exchange control and monitoring data with the drive.

This is particularly useful in large factories where many high-power drives are controlled from a centralized control system.

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16. Main Product Applications

Large Pump Systems

The drive is well suited to large pump systems.

Typical applications include:

• Water circulation
• Wastewater
• Process water
• Cooling water
• Large pumping stations
• Industrial utility systems
• Heat-exchanger circulation

Variable-speed operation allows the pump to respond to changing flow and pressure requirements.

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17. Cooling-Water Systems

Large manufacturing facilities often require substantial cooling-water capacity.

The drive can be applied to:

• Cooling tower pumps
• Process cooling pumps
• Heat exchanger circulation
• Equipment cooling
• Central cooling systems

The motor speed can be adjusted according to the actual cooling demand.

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18. Large Industrial Fans

Large fans are another important application.

Potential applications include:

• Furnace fans
• Exhaust systems
• Combustion-air fans
• Dust collection
• Industrial ventilation
• Process air
• Cooling systems

Variable-speed operation allows airflow to be adjusted according to process requirements.

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19. Large Blowers

Industrial blowers can also require high motor power.

Potential applications include:

• Process-air systems
• Combustion systems
• Industrial ventilation
• Air supply
• Dust control
• Process equipment

The drive provides a means of adjusting blower speed according to the operating condition.

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20. Conveyor Systems

Large conveyor systems can require very high motor power.

Potential applications include:

• Mining
• Cement
• Aggregate
• Ports
• Bulk materials
• Heavy manufacturing

Controlled acceleration is especially useful in these systems.

Instead of immediately applying full motor torque, the drive can control the acceleration process.

This can reduce mechanical stress on belts, gearboxes, couplings, shafts and bearings.

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21. Mining Applications

The high current capacity makes the model suitable for consideration in large mining systems.

Possible applications include:

• Long-distance conveyors
• Dewatering pumps
• Ventilation fans
• Processing machinery
• Material handling
• Large auxiliary equipment

Environmental protection must be considered separately because mining environments can have high levels of dust, vibration and temperature variation.

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22. Cement and Aggregate Applications

Large cement and aggregate plants use numerous high-power motors.

The drive can be considered for:

• Large fans
• Conveyors
• Pumps
• Dust collection
• Material handling
• Cooling equipment
• Process machinery

The variable-speed capability provides additional flexibility when production requirements change.

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23. Compressor Applications

Large compressors can also use high-power variable frequency drives.

Potential benefits include:

• Adjustable operating speed
• Controlled starting
• Flexible output
• Reduced mechanical shock
• Improved process matching

Compressor torque characteristics should be checked carefully because compressor loads can differ significantly from centrifugal pump or fan loads.

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24. Heavy Industrial Machinery

The drive can be considered for large rotating machinery used in heavy industry.

Potential applications include:

• Process equipment
• Large pumps
• Large fans
• Blowers
• Conveyors
• Material handling
• Cooling systems
• Production machinery

The Frame 9 construction makes it particularly suitable for centralized electrical installations.

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25. Main Product Advantages

High Current Capacity

The 1175 A class provides substantial capacity for large industrial motors.

This is the most important characteristic when comparing this model with smaller drives.

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High Power Rating

The model provides a 710 kW normal-duty rating and 560 kW heavy-duty rating, giving it a broad operating range.

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Large Frame Construction

Frame 9 is designed for high-power industrial applications.

It provides a physical architecture appropriate for large drive systems.

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Variable-Speed Control

The motor does not have to operate at one fixed speed.

The drive can adjust speed according to the actual process requirement.

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Controlled Acceleration

Large motors can produce considerable mechanical shock during direct starting.

The drive can control acceleration and provide smoother motor startup.

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Network Integration

Embedded EtherNet/IP makes the drive suitable for integration into centralized industrial automation systems.

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Suitable for Centralized Drive Rooms

The 800 mm deep MCC-style configuration is appropriate for large industrial electrical rooms.

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Flexible Application Range

The drive can be applied to many different types of large machinery.

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26. Advantages in Pump Applications

For centrifugal pumps, variable-speed operation can provide improved process flexibility.

The pump can respond to changing requirements for:

• Flow
• Pressure
• Water demand
• Process demand

This can reduce the need to operate the pump continuously at maximum speed.

The actual energy-saving potential depends on the pump curve and complete hydraulic system.

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27. Advantages in Fan Applications

Large fans often operate under changing airflow requirements.

Variable-speed operation allows fan output to be adjusted according to demand.

Potential advantages include:

• Adjustable airflow
• Controlled startup
• Flexible operation
• Better process matching
• Reduced unnecessary full-speed operation

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28. Advantages in Conveyor Applications

For conveyors, one of the most important benefits is controlled acceleration.

A gradual acceleration profile can reduce mechanical shock.

This can be useful for:

• Long conveyors
• Heavy conveyors
• Mining conveyors
• Bulk-material systems
• Cement conveyors

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29. Advantages in Industrial Automation

The drive can become part of a larger automation system rather than operating as an isolated electrical device.

The control system can monitor:

• Motor speed
• Motor current
• Drive frequency
• Operating state
• Fault condition
• Warning condition
• Diagnostic information

This allows operators to monitor the equipment from a centralized location.

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30. Five Recommended Models — Same Series or Closely Related

The following models are useful comparison candidates within the same PowerFlex 755 high-power range.

The K0 and K1 models are logical alternatives when the required motor current is lower.

The K4 and K5 models are more appropriate for applications requiring greater current capacity.

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31. Five Related Models for Different Voltage Classes

The voltage class must be matched to the motor and plant electrical system.

A 690 VAC model should not be treated as a direct replacement for a 400 VAC model simply because its current rating is similar.

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32. Five Recommended Popular Models from the Same Brand

For comparison purposes, the following are useful high-power models from the same brand and product family.

These models are best regarded as comparison candidates rather than guaranteed drop-in replacements.

The correct replacement must be determined from motor voltage, motor current, load duty, enclosure requirements and the complete application.

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33. Detailed Comparison of Recommended Models

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34. Application Suitability

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35. Environmental Parameters

The upper temperature range should be considered during cabinet design.

At high ambient temperatures, ventilation and drive derating requirements should be evaluated carefully.

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36. Maintenance Recommendations

A large high-power drive should be included in a preventive-maintenance program.

Cooling is particularly important because excessive temperature can accelerate aging of electrical and electronic components.

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37. Installation Considerations

The 20G11LC1K2JN0NNNNN should be treated as a major electrical installation.

Before installation, the following points should be reviewed:

Electrical Supply

The incoming supply must be compatible with the 400 VAC three-phase drive configuration.

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Motor

The motor’s:

• Voltage
• Full-load current
• Power
• Frequency
• Speed
• Duty
• Insulation

should be checked.

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Cable System

Large current levels require careful conductor selection.

Motor cable routing, grounding and termination should be properly engineered.

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Cooling

The cabinet requires adequate ventilation.

Airflow must not be blocked.

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Mechanical Space

The 800 mm cabinet-depth class must be included in the equipment layout.

Additional front and service space should be provided.

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Weight

The final configuration-specific weight in kg should be confirmed before lifting and transportation.

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38. Selection Guide

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39. Key Advantages Summary

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40. Complete Technical Parameter Table

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41. Final Product Assessment

The 20G11LC1K2JN0NNNNN is a high-capacity PowerFlex 755 variable frequency drive designed for large industrial motor applications.

Its 400 VAC three-phase input, 1175 A current class, 710 kW normal-duty rating and 560 kW heavy-duty rating make it suitable for applications where substantial motor capacity is required.

The model is especially appropriate for large pumps, fans, blowers and conveyors.

For pump applications, the drive can regulate motor speed according to flow and pressure requirements.

For fan applications, it can provide adjustable airflow and controlled startup.

For conveyor applications, controlled acceleration can help reduce mechanical shock to belts, gearboxes, shafts and couplings.

For large process equipment, embedded EtherNet/IP provides a convenient way of connecting the drive to a centralized automation system.

The Frame 9 architecture and 800 mm deep MCC-style cabinet make this model a substantial piece of industrial electrical equipment.

It is therefore more suitable for a dedicated electrical room, MCC area or large industrial cabinet installation than for a compact machine enclosure.

The Type 1 / IP20 enclosure should be considered an indoor industrial enclosure arrangement rather than a sealed environmental enclosure.

The model’s cooling system is also an important consideration.

Because of the high power level, ventilation must be properly designed and maintained.

The final equipment layout should provide sufficient space for airflow, cable installation, inspection and maintenance.

The exact overall height and width depend on the final configuration, while the cabinet is specified in the 800 mm depth class.

For the same reason, the exact equipment weight in kg should be confirmed from the final configured unit before transportation or lifting.

Among the recommended alternatives, the K0 and K1 configurations are useful when a somewhat lower current capacity is sufficient.

The K4 and K5 configurations are more appropriate when a larger motor requires additional current capacity.

The 480 VAC and 690 VAC alternatives should only be considered when the motor and plant electrical system use those corresponding voltage classes.

Overall, the 20G11LC1K2JN0NNNNN is best suited to large-scale industrial applications requiring high-power variable-speed motor control, centralized automation, controlled acceleration and reliable operation of large rotating machinery.

It is particularly attractive for large pumping systems, industrial fans, blowers, conveyors, mining equipment, cement equipment, cooling systems and large process machinery where a high-current Frame 9 drive is required.