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1. Product Overview

The 20G11LC1K0JN4NNNNN is a high-power AC variable frequency drive designed for large industrial motor-control applications.

It belongs to the PowerFlex 755 series and is configured as an air-cooled packaged drive for three-phase 400 VAC systems.

With a rated output current of 1040 A, this is a large-frame industrial drive intended for motors requiring several hundred kilowatts of power. Its published duty ratings are 630 kW for light-duty operation, 560 kW for normal-duty operation, and 500 kW for heavy-duty operation.

The unit uses a Frame 9 construction with an 800 mm deep MCC-style cabinet. It is designed for installation in industrial electrical rooms, motor-control centers and large machine-control systems.

The configuration also includes embedded EtherNet/IP, an enhanced LCD/full-numeric operator interface, forced-air cooling, AC input with DC terminals, filtering and a CM jumper.

This combination makes the model suitable for applications where high motor power, centralized control, local commissioning and industrial communication are all important.

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2. Brand and Product Series

The PowerFlex 755 series is designed for demanding industrial motor applications where conventional small-frame variable frequency drives are not adequate.

The target model is positioned toward the high-power end of the series, with a current rating exceeding one thousand amperes.

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3. Complete Technical Parameter Table

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4. Dimensions and Weight

The physical dimensions are an important consideration for this particular product because it is a large Frame 9 packaged drive rather than a compact wall-mounted inverter.

The catalog configuration uses an 800 mm deep MCC-style cabinet.

The 800 mm value represents the cabinet-depth class and should not be mistaken for the complete height × width × depth dimensions.

The exact width and height can vary according to the mechanical configuration, enclosure arrangement and selected options.

For weight, it is better to use “configuration-dependent kg” than to insert an unverified number into an engineering document.

A large Frame 9 packaged drive can have a substantially different shipping weight from a basic drive module. The final shipping weight should therefore be used for crane selection, transportation, floor-loading calculations and installation planning.

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5. Electrical Ratings

The electrical rating is one of the most important aspects of the 20G11LC1K0JN4NNNNN.

The three different power ratings reflect different operating-duty requirements.

A light-duty application generally allows a higher motor-power rating than a heavy-duty application because the thermal and overload requirements are different.

For this reason, selecting a drive simply by comparing motor horsepower or kilowatts can lead to an incorrect selection.

The motor’s rated current, overload requirement, acceleration characteristics and load type should all be considered.

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6. Product Introduction

The 20G11LC1K0JN4NNNNN is designed for large industrial motors where accurate speed regulation and controlled acceleration are required.

A variable frequency drive controls the frequency and voltage supplied to an AC motor, allowing motor speed to be adjusted according to process requirements.

For a large industrial installation, this provides much more flexibility than operating the motor continuously at a fixed speed.

The drive can be incorporated into an automated production system and can exchange operating information with a control system through its integrated industrial communication capability.

The enhanced local operator interface is also useful during commissioning and maintenance.

A technician can work directly at the drive to inspect operating parameters, monitor status and diagnose faults.

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7. Main Product Characteristics

The key characteristics of the model can be summarized as follows:

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8. Product Applications

8.1 Large Water Pumps

Large water pumps are an excellent application for this type of drive.

The drive can adjust motor speed according to the required flow or pressure.

This is useful in:

• Water-treatment plants
• Industrial water systems
• Cooling-water systems
• Wastewater treatment
• Process-water circulation
• Large pumping stations
• Industrial utility systems

A variable-speed pump can respond to changing process requirements instead of operating continuously at maximum speed.

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8.2 Cooling Pumps

Large industrial plants frequently use cooling-water pumps to remove heat from production equipment.

The required flow can change according to production conditions.

Variable-speed operation allows the pump to respond to those changes.

This can improve process control and can reduce unnecessary motor operation when full flow is not required.

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8.3 Industrial Fans

Large fans are another common application for high-power variable frequency drives.

Typical applications include:

• Factory ventilation
• Furnace ventilation
• Process exhaust
• Dust collection
• Cooling systems
• Combustion-air systems
• Large air-handling systems
• Industrial extraction systems

The drive allows the fan speed to be adjusted according to airflow requirements.

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9. Conveyor Applications

Large conveyors often operate under changing material loads.

A variable frequency drive can provide controlled acceleration and deceleration.

This can help reduce mechanical shock on:

• Conveyor belts
• Gearboxes
• Couplings
• Bearings
• Shafts
• Pulleys
• Mechanical structures

The model is therefore suitable for large conveyor systems used in mining, cement, aggregate processing, ports and heavy manufacturing.

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10. Compressor Applications

Large compressors can require hundreds of kilowatts of motor power.

The drive can regulate motor speed according to:

• Pressure
• Production rate
• Air demand
• Process requirements
• System loading

This can provide a more flexible operating method than fixed-speed operation.

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11. Mining Applications

Large mining operations use high-power motors throughout the production process.

Potential applications include:

• Mining conveyors
• Material-handling systems
• Large pumps
• Ventilation fans
• Crushers
• Processing equipment
• Auxiliary machinery

The Frame 9 construction is well suited to centralized electrical installations where large drives are grouped within an industrial motor-control area.

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12. Cement and Aggregate Applications

The cement and aggregate industries contain many large motor loads.

Possible applications include:

• Raw-material conveyors
• Crushers
• Large process fans
• Dust-collection fans
• Cooling pumps
• Material-handling equipment
• Process machinery

The ability to control motor speed can help match machine operation to actual production requirements.

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13. Steel and Heavy Manufacturing Applications

Large manufacturing facilities can use the drive for:

• Cooling pumps
• Process fans
• Conveyor systems
• Material handling
• Auxiliary machinery
• Ventilation systems
• Industrial pumping

In these environments, the drive can be integrated into a larger control architecture while still providing local operator access.

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14. Advantages of the Product

14.1 High 1040 A Current Rating

The 1040 A current rating is the most important characteristic of the model.

It allows the drive to control very large motors.

This makes it substantially different from small and medium variable frequency drives intended for ordinary machinery.

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14.2 Several-Hundred-Kilowatt Motor Capability

The drive can accommodate large motors according to the applicable duty rating.

This provides flexibility for different types of industrial loads.

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15. Embedded Industrial Communication

The integrated EtherNet/IP capability is useful when the drive forms part of an automated production system.

The drive can exchange information with a control system.

Typical information includes:

• Speed reference
• Actual speed
• Current
• Status
• Faults
• Warnings
• Control commands
• Diagnostic information

This makes it easier to integrate the motor drive into centralized plant control.

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16. Enhanced LCD Operator Interface

The enhanced LCD/full-numeric HIM is particularly useful for commissioning and service work.

Technicians can use the local interface to:

• Read parameters
• Change settings
• Monitor drive operation
• View faults
• Review warnings
• Perform commissioning
• Check operating conditions

The local operator interface is useful even when the drive is normally operated through a PLC or centralized HMI.

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17. Large Frame 9 Construction

Frame 9 construction is intended for large industrial applications.

The larger physical format provides room for high-power components, cooling equipment and associated electrical equipment.

It is especially appropriate for:

• Electrical rooms
• Motor-control centers
• Centralized drive rooms
• Large machine installations
• Process plants

The physical size is considerably larger than that of a conventional small machine drive.

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18. Forced-Air Cooling

The drive uses forced-air cooling.

High-power semiconductor components generate significant heat during operation.

The cooling system therefore plays an important role in overall reliability.

The installation should provide adequate airflow and should prevent excessive recirculation of hot air.

Regular maintenance should include inspection of:

• Cooling fans
• Air passages
• Cabinet ventilation
• Dust accumulation
• Ambient temperature

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19. Enclosure

The drive uses a Type 1 / IP20 enclosure configuration.

This means the installation environment must be properly controlled.

The drive should be installed in an appropriate industrial electrical environment.

The operator interface has a separate, higher protection classification of IP66 / NEMA Type 4X/12.

These two ratings describe different parts of the equipment and should not be confused.

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20. No Dynamic Braking

This model is configured without dynamic braking.

This is suitable for many applications where the motor does not need rapid stopping.

Typical examples may include:

• Large centrifugal pumps
• Large fans
• Continuous process equipment
• Some conveyor applications

However, high-inertia equipment requiring frequent rapid deceleration should be evaluated separately.

If a large amount of braking energy must be dissipated, a suitable braking arrangement should be considered during system design.

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21. Installation Considerations

The 20G11LC1K0JN4NNNNN is large electrical equipment and should be installed with appropriate engineering controls.

Electrical Considerations

The incoming power system must be suitable for the 400 VAC, three-phase configuration and the high-current requirements.

Cable sizing, protection, grounding and short-circuit conditions should be evaluated as part of the complete installation.

Mechanical Considerations

The cabinet depth is approximately 800 mm.

The exact height and width depend on the final configuration.

Adequate front and service access should be provided.

Thermal Considerations

The cooling system requires sufficient ventilation.

Hot air should not be allowed to recirculate back into the drive’s cooling intake.

Maintenance Considerations

The installation should allow technicians to inspect the drive safely and perform routine maintenance.

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22. Five Recommended Models from the Same Series or Closely Related Configurations

The following models are useful alternatives when comparing large PowerFlex 755 configurations.

These models are particularly useful for comparison when the application uses a 400 VAC industrial motor system.

The main selection factor is the required motor current and duty rather than simply selecting the model with the highest nominal kW value.

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23. Comparison of Related 400 VAC Models

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24. Five Popular Models from the Same Brand

For broader selection, the following models provide useful comparison points across the same industrial-drive family.

The purpose of this comparison is to show the different voltage and current classes available within the same general product family.

For actual replacement work, the complete catalog number should always be checked rather than selecting a substitute based only on voltage and current.

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25. 400 VAC Versus 480 VAC Versus 690 VAC

Voltage compatibility is one of the first factors to check when selecting a related model.

A 690 VAC model should not be substituted for a 400 VAC model simply because the 690 VAC model has a higher power rating.

The motor voltage, plant distribution voltage and drive voltage class must all be compatible.

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26. Recommended Application by Model

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27. Typical System Architecture

A typical installation can be organized in the following manner:

Industrial Power System

↓

400 VAC Three-Phase Supply

↓

Drive Protection and Disconnect Equipment

↓

20G11LC1K0JN4NNNNN

↓

Industrial AC Motor

↓

Pump / Fan / Conveyor / Compressor / Process Machine

At the control level:

PLC / Control System

↓

EtherNet/IP

↓

20G11LC1K0JN4NNNNN

↓

Motor Speed and Torque Control

This architecture allows the drive to function as part of a complete automated production system.

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28. Maintenance Recommendations

A high-power air-cooled drive should be maintained as an important piece of plant electrical equipment.

Preventive maintenance is particularly important in dusty industrial environments.

A large amount of dust on cooling equipment can gradually reduce airflow and increase operating temperature.

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29. Product Advantages in Practical Industrial Use

The real advantage of the 20G11LC1K0JN4NNNNN is not based on a single specification.

Its value comes from the combination of several characteristics.

First, it has enough current capacity for very large 400 V motors.

Second, the Frame 9 architecture is designed for substantial industrial installations.

Third, the embedded communication capability allows it to operate within an automated control system.

Fourth, the enhanced LCD operator interface gives maintenance personnel direct access to the drive.

Fifth, variable-speed control allows large motors to operate according to actual process requirements.

These characteristics make the drive particularly useful in plants where motor control is an important part of the production process.

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30. Suitable Industries

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31. Selection Points That Should Not Be Overlooked

When selecting the 20G11LC1K0JN4NNNNN, the following points deserve particular attention.

Motor Current

The motor’s nameplate current should be checked against the drive rating.

Duty

The application should be classified correctly as light, normal or heavy duty.

Acceleration

Large motors and high-inertia loads may require specific acceleration settings.

Braking

Because this configuration does not include dynamic braking, applications requiring rapid stopping should be evaluated separately.

Cooling

Adequate ventilation is essential for reliable operation.

Cabinet Space

The 800 mm depth must be considered in the electrical-room layout.

Weight

The final mechanical documentation should be used for lifting and transportation calculations.

Network

The control architecture should determine whether the embedded EtherNet/IP capability will be used.

Local Interface

The enhanced LCD/full-numeric HIM is useful where local commissioning and troubleshooting are required.

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32. Overall Evaluation

The 20G11LC1K0JN4NNNNN is a large-frame industrial variable frequency drive designed for high-power motor applications.

Its core configuration is:

400 VAC / 3 Phase / 1040 A / Frame 9 / 630 kW LD / 560 kW ND / 500 kW HD / Air Cooled / Type 1 IP20 / 800 mm Deep MCC Style / Embedded EtherNet/IP / Enhanced LCD Full Numeric HIM.

The model is particularly suitable for large pumps, fans, conveyors, compressors, mining equipment, cement machinery, water-treatment systems, process equipment and other heavy industrial rotating machinery.

The 1040 A rating provides substantial capacity for large 400 V motors.

The 630 kW light-duty rating makes it particularly attractive for applications such as variable-torque pumps and fans where the operating profile permits the light-duty classification.

For more demanding applications, the 560 kW normal-duty and 500 kW heavy-duty ratings provide the appropriate reference points.

The 800 mm MCC-style cabinet makes this a plant-level drive rather than a compact machine-mounted inverter.

The integrated communication capability allows the unit to participate in centralized automation, while the enhanced LCD/full-numeric interface provides convenient local access during commissioning and maintenance.

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33. Final Technical Summary

34. Conclusion

The 20G11LC1K0JN4NNNNN is best regarded as a high-capacity industrial motor drive for applications where conventional compact VFDs are no longer sufficient.

Its combination of 1040 A current capacity, 400 VAC three-phase operation, Frame 9 construction, 630/560/500 kW duty ratings, forced-air cooling, 800 mm MCC-style construction, EtherNet/IP communication and enhanced local operator interface gives it a broad range of applications in heavy industry.

For a large 400 V pump or fan, the model provides a strong combination of capacity and controllability.

For large conveyors and other high-inertia machines, the drive offers controlled acceleration and speed regulation, although the braking requirements must be checked separately.

For automated production plants, the integrated network capability allows the drive to be incorporated into a larger control architecture.

For maintenance personnel, the enhanced LCD/full-numeric interface provides a practical method of local monitoring and commissioning.

When selecting an alternative, the most important points are motor voltage, motor rated current, duty classification, overload requirement, braking requirement, enclosure, physical dimensions, cooling arrangement and communication requirements.

Among the related models, higher-current 400 VAC configurations are the natural choice when the target motor exceeds the capacity of the 1040 A model, while 480 VAC or 690 VAC versions should be considered only when the motor and electrical system use those corresponding voltage classes.

For procurement and engineering documentation, the electrical parameters above can be used as the primary product description, while final dimensions and weight in kg should always be confirmed against the exact mechanical configuration before installation, transportation or structural design.