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20G11LC1K5AN0NNNNN — Detailed Product Description, Specifications, Applications, Advantages and Related Models

The 20G11LC1K5AN0NNNNN is a high-power AC variable frequency drive belonging to the PowerFlex 755 series.

It is designed for large industrial motor applications where high output current, adjustable motor speed, controlled acceleration and deceleration, industrial networking, and reliable process control are required.

The model is particularly suitable for large pumps, fans, blowers, conveyors, material-handling systems and other heavy industrial machinery.

Important note: The model is a legacy/discontinued configuration, so exact mechanical details such as the final shipping weight can depend on the original packaged configuration. For that reason, the weight is shown as “To Be Confirmed” rather than using an estimated value.

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1. Basic Product Information

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2. Product Introduction

The 20G11LC1K5AN0NNNNN is a large industrial variable frequency drive intended for controlling high-power three-phase AC motors.

Unlike a conventional fixed-speed motor starter, a variable frequency drive allows the motor speed to be adjusted according to the requirements of the production process.

This is particularly useful when a motor does not need to operate continuously at full speed.

For example, a large pump may need maximum flow during one production stage and reduced flow during another stage. Similarly, a large fan may need different airflow levels depending on temperature, pressure or production requirements.

The drive adjusts the motor operating frequency and voltage so that the motor can operate at a controlled speed.

Because this model has a rated current of approximately 1,480 A, it belongs to the very high-power section of the PowerFlex 755 product range.

Its approximately 850 kW normal-duty rating makes it appropriate for large industrial motors rather than ordinary machine-building applications.

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3. Brand

Allen-Bradley is the brand associated with this product family.

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4. Product Series

The product belongs to the PowerFlex 755 series.

The PowerFlex 755 series is designed for demanding industrial motor-control applications.

Compared with compact variable frequency drives, the PowerFlex 755 platform provides a much broader range of control, communication and high-power configuration possibilities.

Typical functions include:

• Adjustable motor speed
• Controlled acceleration
• Controlled deceleration
• Motor protection
• Drive diagnostics
• Process control
• Industrial networking
• Speed reference control
• Status monitoring
• Fault monitoring

The 20G11LC1K5AN0NNNNN represents a high-power configuration within this family.

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5. Main Electrical Parameters

The current rating is one of the most important characteristics of this model.

At 1,480 A, it is designed for large low-voltage industrial motors and should be selected according to the actual motor nameplate current and application duty.

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6. Light-Duty Rating

The model has a light-duty rating in the region of 900 kW.

Light-duty operation is generally associated with applications where the motor does not continuously experience severe overload requirements.

Typical examples can include variable-torque applications.

Possible applications include:

• Large centrifugal pumps
• Large fans
• Cooling-water systems
• Ventilation systems
• Large blowers

For final selection, the actual motor current and load profile should always be checked.

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7. Normal-Duty Rating

The normal-duty rating is approximately 850 kW.

This is one of the most useful ratings when evaluating the model for large process machinery.

Normal-duty applications can include:

• Large pumps
• Industrial fans
• Large blowers
• Conveyors
• Material-handling equipment
• Process machinery
• Cooling systems
• Heavy industrial production equipment

The 850 kW rating gives the model a substantial operating range for large motor installations.

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8. Heavy-Duty Rating

The heavy-duty rating is approximately 710 kW.

Heavy-duty operation is more demanding because the motor may experience greater torque requirements or more severe acceleration conditions.

Typical situations include:

• High starting torque
• Frequent acceleration
• High mechanical resistance
• Repeated loading
• Heavy material handling
• High-inertia machinery
• Rapid changes in process load

When a motor is used in a demanding application, the heavy-duty rating should be considered rather than simply comparing the motor’s nominal kW value.

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9. Mechanical Construction

The model uses a Frame 9 configuration.

Frame 9 is intended for high-power industrial installations.

A large frame provides space for:

• Power components
• Cooling equipment
• High-current electrical connections
• Control components
• Communication hardware
• Input connections
• Output connections
• Internal protection components

Because of its size and current capacity, the installation normally requires a properly designed electrical cabinet or industrial drive lineup.

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10. Dimensions

The model belongs to an 800 mm deep MCC-style configuration.

The 800 mm dimension is particularly important during installation planning.

The exact overall height and width should be determined from the specific mechanical configuration.

For a high-power drive, these dimensions should not be estimated when designing the installation area.

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11. Weight

The weight of a high-power packaged drive can vary depending on the final cabinet configuration, installed options and packaging arrangement.

Therefore, it is not appropriate to provide an invented kilogram value.

For lifting, transportation and floor-loading calculations, the actual equipment documentation should be used.

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12. Cooling System

The 20G11LC1K5AN0NNNNN uses forced-air cooling.

A high-power drive generates significant heat during operation, especially when operating at high current.

The cooling system is therefore an important part of the installation.

Good installation practice includes:

• Maintaining adequate airflow
• Keeping ventilation passages clean
• Avoiding excessive ambient temperature
• Inspecting cooling fans
• Preventing dust accumulation
• Maintaining required service clearance
• Checking for abnormal temperature increases
• Keeping air intake and exhaust areas unobstructed

A properly designed cooling system helps maintain stable operation and improves long-term reliability.

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13. Embedded EtherNet/IP

The model includes embedded EtherNet/IP communication.

This allows the drive to be integrated into an industrial automation system.

The control system can exchange information with the drive.

Typical information includes:

For large automated plants, network communication can be much more convenient than relying entirely on local controls.

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14. Product Applications

Large Pump Systems

The model is well suited for evaluation in large pumping systems.

Possible applications include:

• Industrial water pumps
• Cooling-water pumps
• Process-water pumps
• Wastewater pumps
• Water-transfer systems
• Utility pumps
• Large circulation pumps

A variable frequency drive can adjust pump speed according to actual process requirements.

This can provide more flexible flow control than a fixed-speed motor arrangement.

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15. Cooling Water Systems

Large industrial plants often require high-power pumps for cooling systems.

The drive can be used for:

• Cooling-water circulation
• Heat-exchanger systems
• Cooling towers
• Industrial cooling loops
• Process cooling
• Central utility systems

The speed of the pump can be adjusted according to the required flow and pressure.

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16. Large Fan Applications

Large fans can require very high motor power.

Possible applications include:

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

A variable frequency drive allows the fan speed to be adjusted according to actual airflow requirements.

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17. Large Blowers

Large industrial blowers can also benefit from variable-speed control.

Typical applications include:

• Process-air systems
• Aeration systems
• Industrial ventilation
• Dust collection
• Combustion systems
• Air-supply systems

The high-current capability of the model makes it suitable for consideration in very large blower installations.

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18. Conveyor Systems

Large conveyors often require controlled acceleration.

If a large motor is started too aggressively, the mechanical system can experience substantial stress.

Using a variable frequency drive can provide:

• Controlled acceleration
• Controlled deceleration
• Adjustable speed
• Reduced mechanical shock
• Better coordination
• Improved process control

This is especially useful in:

• Mining
• Cement plants
• Aggregate plants
• Bulk material handling
• Port facilities
• Heavy manufacturing

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19. Mining Applications

Large mining operations use many high-power motors.

Potential applications include:

• Large conveyors
• Dewatering pumps
• Ventilation fans
• Material-handling systems
• Processing machinery
• Large blowers

The drive’s high current capacity makes it a suitable candidate for large motor-control systems where the electrical and environmental requirements match the configuration.

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20. Cement and Aggregate Applications

Cement and aggregate plants use large motors throughout the production process.

Possible applications include:

• Large fans
• Conveyors
• Blowers
• Pumps
• Cooling equipment
• Material-handling machinery
• Process equipment

The drive can provide adjustable speed and controlled acceleration while communicating with the plant automation system.

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21. Advantages of the Product

High Current Capacity

The 1,480 A rating is the most obvious advantage of this model.

It allows the drive to be considered for large low-voltage industrial motors.

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High Power Capability

The model provides approximately:

• 900 kW light duty
• 850 kW normal duty
• 710 kW heavy duty

This gives the product considerable flexibility for different industrial load profiles.

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Adjustable Motor Speed

Motor speed can be adjusted according to the process.

This can be particularly useful for pumps, fans, conveyors and blowers.

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Controlled Acceleration

The drive can gradually accelerate the motor rather than applying full operating conditions immediately.

This can help reduce mechanical shock.

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Controlled Deceleration

Controlled deceleration can be useful when stopping large rotating equipment.

It can also help coordinate the motor with the overall production process.

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Industrial Network Integration

Embedded EtherNet/IP makes it possible to integrate the drive into an industrial automation architecture.

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Large Industrial Construction

Frame 9 construction is intended for large industrial installations.

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Forced-Air Cooling

The air-cooled configuration is designed for high-power applications where substantial heat must be removed during operation.

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22. Advantages for Pump Applications

For pump systems, the drive can provide:

• Variable flow control
• Adjustable pressure
• Controlled starting
• Controlled stopping
• Process automation
• Speed monitoring
• Fault monitoring
• Remote operation

A pump does not always need to operate at maximum speed.

The ability to adjust speed allows the pump operation to better match the actual process requirement.

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23. Advantages for Fan Applications

Industrial fan requirements can change significantly during production.

A variable frequency drive allows the fan speed to be adjusted.

Potential benefits include:

• Adjustable airflow
• Controlled startup
• Process coordination
• Remote speed control
• Automated operation
• Operating-status monitoring

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24. Advantages for Conveyor Applications

For large conveyors, acceleration control is particularly valuable.

The drive can provide a more controlled transition from standstill to operating speed.

Potential benefits include:

• Reduced mechanical shock
• Controlled startup
• Adjustable speed
• Better process coordination
• Easier automation
• Improved operating flexibility

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25. Advantages for Large Industrial Systems

The model is particularly attractive when several requirements occur at the same time:

1. Very large motor power
2. High motor current
3. Adjustable speed
4. Automated control
5. Industrial networking
6. Controlled acceleration
7. Process monitoring
8. Large-scale continuous operation

This combination places the model in a different category from compact machine drives.

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26. Detailed Technical Parameter Table

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27. Five Same-Series or Closely Related Models

The following models are useful alternatives when comparing high-power PowerFlex 755 configurations.

These models are particularly useful when the requirement is close to the 20G11LC1K5AN0NNNNN specification.

The K4 configuration represents a slightly lower capacity.

The K5 configurations provide the same basic high-power class while changing the option arrangement.

The K6 configuration moves to a higher current and power class.

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28. Comparison of K4, K5 and K6

The K5 version is therefore positioned between the lower-capacity K4 and higher-capacity K6 configurations.

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29. Five Related Models — Application-Oriented Recommendations

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30. Five Popular Models from the Same Brand

For a broader product selection, the following models can be considered as representative alternatives across different power levels.

These models cover a useful range around the requested product, from approximately 560 kW normal duty to approximately 1,250 kW normal duty.

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31. Power Range Comparison

This comparison shows that the 20G11LC1K5AN0NNNNN occupies a high-power position while still being below the much larger Frame 10 configuration.

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32. Application Selection Table

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33. Advantages Compared With a Fixed-Speed Motor Starter

The major difference is flexibility.

A fixed-speed motor system generally operates around a predetermined speed, while a variable frequency drive can change motor speed according to process requirements.

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34. Why the 1,480 A Rating Matters

The 1,480 A specification is not simply another catalog number.

It determines the scale of motor that the drive can potentially control.

For large industrial motors, current is often more useful for final drive selection than horsepower or kilowatt alone.

The correct selection should consider:

• Motor rated current
• Motor voltage
• Motor power
• Motor service factor
• Load type
• Starting torque
• Acceleration requirements
• Overload requirements
• Operating temperature
• Duty cycle
• Required speed range

A motor with a nominal power rating that appears compatible may still require a different drive if its actual nameplate current or overload requirements are higher.

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35. Why the Duty Rating Matters

A common mistake when selecting a large drive is to look only at the largest kW number.

For this model, the three main values have different meanings:

Therefore, an 850 kW motor cannot automatically be assumed to be suitable simply because the drive has a 900 kW light-duty rating.

The actual load characteristics determine which rating should be used.

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36. Installation Considerations

A drive of this size requires careful installation planning.

Important considerations include:

• Incoming power
• Motor voltage
• Motor current
• Short-circuit requirements
• Protective devices
• Grounding
• Motor cable selection
• Cable routing
• Cabinet ventilation
• Ambient temperature
• Cooling airflow
• Maintenance access
• Lifting equipment
• Floor loading
• Network architecture
• Control wiring
• EMC considerations

The 800 mm cabinet depth should be considered when planning the electrical room and equipment lineup.

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37. Maintenance Considerations

Regular inspection can help maintain stable operation.

Typical maintenance activities include:

• Inspecting cooling fans
• Checking ventilation paths
• Removing excessive dust
• Inspecting electrical connections
• Checking cabinet temperature
• Monitoring drive faults
• Reviewing operating current
• Reviewing motor speed
• Checking network communication
• Inspecting abnormal noise or vibration
• Recording recurring warnings

For a large industrial drive, preventive maintenance can be particularly valuable because an unexpected drive failure can stop a major production system.

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38. Recommended Use Cases

The 20G11LC1K5AN0NNNNN is most appropriate when the application has several of the following characteristics:

• Motor power in the hundreds of kilowatts
• 400 V AC class supply
• High motor current
• Need for variable speed
• Need for controlled acceleration
• Need for controlled deceleration
• Industrial Ethernet communication
• Large pump or fan system
• Large conveyor
• Large blower
• Heavy industrial process

It is not intended to be a general-purpose small machine drive.

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39. Overall Product Advantages

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40. Final Product Summary

The 20G11LC1K5AN0NNNNN is a high-power PowerFlex 755 AC variable frequency drive designed for large industrial motor-control applications.

Its key electrical characteristics include a 400 V AC three-phase class, approximately 1,480 A current capacity, approximately 900 kW light-duty capability, 850 kW normal-duty capability, and 710 kW heavy-duty capability.

The product uses Frame 9 construction and an air-cooled 800 mm deep MCC-style configuration.

The embedded EtherNet/IP capability makes the drive suitable for integration into modern industrial automation systems.

Its strongest application areas include large pumps, cooling-water systems, industrial fans, blowers, conveyors, mining equipment, cement equipment, aggregate machinery and other high-power process equipment.

The main advantage of this model is not simply its high kW rating. Its value comes from the combination of high current capacity, adjustable-speed operation, industrial communication, controlled acceleration and deceleration, large-frame construction and high-power process control.

For a large industrial motor, the model can provide a more flexible control solution than a simple fixed-speed starter.

At the same time, final selection should always be based on the actual motor nameplate information, especially motor voltage, rated current, duty, torque characteristics, overload requirements and operating environment.

The 800 mm depth is the key dimensional reference for the cabinet configuration. Exact overall width, height and product weight in kg should be confirmed against the particular mechanical arrangement because a reliable weight value should not be estimated for a large packaged drive.

Overall, the 20G11LC1K5AN0NNNNN can be regarded as a high-capacity industrial drive intended for applications where a large AC motor needs dependable variable-speed control and integration into a larger automation system.