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Allen-Bradley 20G11LF795JN0NNNNN PowerFlex 755 AC Drive — Detailed Product Profile

1. Product Overview

The 20G11LF795JN0NNNNN is an Allen-Bradley PowerFlex 755 AC Drive, belonging to the PowerFlex 750-Series family and, more specifically, the PowerFlex 755 high-performance variable-frequency drive platform.

It is a large-frame, high-power AC drive designed for demanding industrial motor-control applications where conventional small or medium-power frequency converters are not sufficient.

The unit is rated for a 690 VAC three-phase supply and has a nominal output current of 795 A. Its power capability is approximately 800 kW for normal-duty operation and 710 kW for heavy-duty operation, depending on the motor/application duty classification.

The drive uses air cooling and is configured as an 800 mm deep MCC-style, Type 1/IP20 package. It is a large industrial cabinet-type drive rather than a compact wall-mounted inverter.

The product includes embedded EtherNet/IP communication, making it suitable for integration into industrial automation systems, PLC-based control architectures, supervisory systems, and networked motor-control applications.

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2. Basic Product Information

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3. Model Number Interpretation

The model number 20G11LF795JN0NNNNN contains configuration information rather than being simply a serial model number.

The important sections identify the PowerFlex 755 platform, voltage/current class, mechanical arrangement, cooling arrangement, filtering configuration, operator-interface configuration and other factory-selected options.

For practical purchasing and engineering work, the complete catalog number should always be treated as one complete configuration.

For example, two PowerFlex 755 drives may have very similar current ratings but differ in enclosure, cooling, braking, filtering, operator interface or other options. Therefore, the complete catalog number is much more important than comparing only the “795 A” rating.

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4. Main Electrical Parameters

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5. Mechanical Parameters

The 20G11LF795JN0NNNNN is a Frame 9 high-power drive, so its mechanical construction is considerably larger than the compact PowerFlex drives commonly used for small motors.

Important note regarding weight: for a drive of this power level, publishing an invented single weight value would be misleading. The final shipping weight can vary according to cabinet configuration, options, packaging and installation arrangement. For transportation, floor-loading and lifting calculations, the exact configured weight should be used rather than an estimated value.

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6. Product Introduction

The PowerFlex 755 is designed as a high-performance industrial AC drive for controlling large motors.

The 20G11LF795JN0NNNNN is particularly suitable for applications where the motor power is in the hundreds of kilowatts and where precise speed, torque and process control are required.

Compared with compact frequency converters, this type of drive is designed around industrial power systems with substantially higher current levels.

The 690 VAC voltage class is particularly useful in large industrial installations because higher motor voltage allows high motor power to be transmitted with lower current than would be required at lower voltage levels.

The 795 A output rating provides substantial capacity for large motors, while the PowerFlex 755 platform provides a combination of motor control, networking, diagnostics, programmable control functions and industrial integration capabilities.

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7. Main Product Features

High-Power Motor Control

The most significant characteristic of the 20G11LF795JN0NNNNN is its 795 A output current rating.

This places it in the high-power industrial-drive category.

It can be used with large motors for pumps, fans, compressors, conveyors, process equipment and other machinery where controlled acceleration, deceleration and variable-speed operation are required.

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690 VAC Three-Phase Design

The drive is designed for a 690 VAC three-phase system.

This voltage class is commonly used in high-power industrial motor installations because it allows large amounts of motor power to be handled efficiently while keeping motor current within a manageable range.

This makes the drive particularly appropriate for large industrial facilities and heavy process machinery.

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Embedded EtherNet/IP

A major advantage of the PowerFlex 755 architecture is its industrial networking capability.

The 20G11LF795JN0NNNNN has embedded EtherNet/IP capability, allowing it to participate in an industrial control network.

This makes it possible to exchange operating commands, speed references, status information, alarms and diagnostic information with higher-level automation equipment.

For an integrated factory automation system, this can significantly reduce the need for separate hardwired control circuits.

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Air-Cooled Construction

The drive uses an air-cooled architecture.

Air cooling is widely used for large industrial variable-frequency drives because it avoids the complexity of liquid cooling systems.

For proper operation, however, the installation environment must provide adequate ventilation and sufficient clearance for air circulation.

The heat generated by the drive should also be considered when designing the electrical room or MCC area.

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High Current Capacity

With a nominal output current of 795 A, the unit is designed for large motor applications.

This gives it a substantial advantage over smaller PowerFlex models when the motor load requires high current.

It is particularly appropriate when the application requires continuous operation at high power rather than intermittent low-load operation.

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8. Typical Applications

Pumps

The drive is well suited to large industrial pump systems.

Examples include:

• Water-treatment pumps
• Industrial water pumps
• Cooling-water pumps
• Process pumps
• Large circulation pumps
• Mine dewatering pumps
• Irrigation systems
• Industrial utility pumps

Variable-speed control can allow pump output to be adjusted according to actual process requirements rather than simply running the motor at full speed.

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Fans and Blowers

Large fans and blowers are another important application area.

Typical equipment includes:

• Industrial ventilation fans
• Furnace fans
• Cooling-tower fans
• Mine ventilation systems
• Exhaust systems
• Process-air blowers
• Large HVAC-related equipment

Variable-speed control can help match airflow to process demand.

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Conveyors

The high current capability makes this type of drive suitable for large conveyor systems.

Possible applications include:

• Mining conveyors
• Bulk-material conveyors
• Cement conveyors
• Port handling systems
• Aggregate conveyors
• Ore transportation systems
• Heavy industrial material handling

Controlled acceleration is particularly useful for large conveyors because sudden motor acceleration can produce significant mechanical stress.

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Compressors

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

The drive can be used where the compressor motor requires controlled speed rather than constant-speed operation.

Applications may include process plants, industrial air systems and large utility systems.

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Mining Equipment

The PowerFlex 755 platform is suitable for demanding industrial environments where high-power motors are used.

Potential applications include:

• Ore conveyors
• Crushers
• Fans
• Pumps
• Material handling
• Processing equipment
• Large auxiliary machinery

For mining installations, the complete system design must also consider environmental conditions, enclosure requirements, harmonic performance, braking requirements and motor characteristics.

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Heavy Process Machinery

The drive can also be applied to large process machines where speed and torque must be regulated.

Examples include:

• Industrial production lines
• Material-processing equipment
• Large mixers
• Industrial handling systems
• Processing machinery
• Large mechanical drives

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9. Product Advantages

1. High-Power Capability

The 795 A current rating is the primary advantage.

The drive is intended for large motors and high-power industrial systems, making it unsuitable for small applications but extremely useful where high power is required.

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2. 690 VAC Compatibility

The 690 VAC class makes the product suitable for high-power motor systems.

It is particularly valuable where large motors are already designed around 690 V industrial distribution systems.

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3. Strong Industrial Networking

Embedded EtherNet/IP provides a convenient route for integrating the drive with an industrial automation network.

This can simplify communication between the drive and PLC, HMI, supervisory control and other automation equipment.

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4. Flexible Industrial Control

The PowerFlex 755 platform provides a broad set of motor-control functions.

Depending on the overall configuration, application requirements can be addressed through different control modes, feedback arrangements, communications and option modules.

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5. Large-Scale Application Flexibility

The platform is suitable for multiple types of machinery.

A single product family can therefore cover applications such as pumps, fans, conveyors and other large rotating equipment.

This can simplify standardization across an industrial facility.

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6. Diagnostic Capability

A major benefit of a modern industrial drive is the ability to monitor operating conditions and faults.

Drive diagnostics can assist maintenance personnel in identifying problems involving the motor, drive, control system and operating conditions.

This can reduce troubleshooting time compared with traditional motor starters.

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7. Controlled Starting and Stopping

A large motor can generate significant mechanical stress when started directly across the line.

Variable-frequency control allows the motor to accelerate and decelerate in a controlled manner.

This is particularly valuable for conveyors, pumps and other high-inertia machinery.

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10. Five Same-Series / Closely Related Models

The following models are useful for comparison within the PowerFlex 755 high-power family.

Because the complete suffix can represent different factory options, these should be treated as related selection options rather than automatic drop-in replacements.

Comparison Notes

The 20G11LF650JN0NNNNN is a lower-current alternative within the same high-power family.

The 20G11LF710JN0NNNNN is another high-power option and may be appropriate where the motor current requirement is below 795 A.

The 20G11LF710JN2NNNNN has a similar fundamental electrical rating to the 710 A configuration, but the suffix indicates a different configuration option and should therefore be checked carefully before substitution.

The 20G11LF765JN0NNNNN sits between the 710 A and 795 A versions in terms of current capability.

The 20G11LF795JN0NNNNN is the highest-current model in this comparison and is appropriate when the application requires approximately 795 A of drive output capacity.

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11. Five Popular Models Under the Same Brand

The following are useful examples from the broader Allen-Bradley PowerFlex product portfolio.

They cover substantially different power ranges, so they should not be considered direct replacements for the 795 A, 690 VAC PowerFlex 755.

Important Selection Difference

The smaller PowerFlex models above are intended for substantially lower-power applications.

The 20G11LF795JN0NNNNN is a very large industrial drive designed around a 690 VAC, 795 A application.

Therefore, a smaller model should never be selected simply because it belongs to the same overall brand family.

The motor rated current, motor voltage, load type, overload requirement, duty cycle, acceleration requirements, braking requirements and environmental conditions all need to be checked.

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12. Product Series Information

Brand

Allen-Bradley

Product Family

PowerFlex

Series

PowerFlex 750-Series

Specific Product Series

PowerFlex 755

The PowerFlex 755 is positioned as a high-performance industrial AC drive platform.

The 750-Series architecture is designed around industrial motor control and provides a much broader range of configuration possibilities than basic compact variable-frequency drives.

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13. Duty Ratings

One of the most important points when selecting the 20G11LF795JN0NNNNN is understanding its different power ratings.

The exact permissible motor rating should always be selected according to the actual load profile.

A motor that appears to fit based solely on horsepower or kW may not be suitable if the machine requires high overload current or heavy-duty torque.

For example, a conveyor or crusher may have significantly different requirements from a centrifugal pump.

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14. Communication and Automation

The embedded EtherNet/IP capability is one of the practical strengths of this configuration.

The drive can be integrated into a networked automation architecture in which a controller manages:

• Start and stop commands
• Speed references
• Direction
• Operating status
• Fault status
• Drive diagnostics
• Current information
• Speed feedback
• Process-related parameters

This is particularly useful for centralized industrial control systems.

The communication architecture can also reduce the amount of point-to-point wiring required between the drive and control system.

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15. Installation Considerations

Because the 20G11LF795JN0NNNNN is a high-power, air-cooled drive, installation should not be treated like installation of a small compact inverter.

Important considerations include:

Electrical Supply

The incoming supply must be suitable for the 690 VAC three-phase rating.

The upstream protection, short-circuit rating, disconnecting equipment, cabling and grounding system must all be designed for the actual installation.

Ventilation

Air-cooled equipment requires adequate airflow.

The electrical room or enclosure arrangement must be designed so that hot exhaust air does not circulate back into the drive’s intake path.

Heat Dissipation

At this power level, the heat produced by the drive can be substantial.

The total thermal load of the electrical room should therefore be considered when selecting ventilation or air-conditioning capacity.

Motor Cable

The motor cable should be selected according to the output current, installation method, cable length, environmental conditions and applicable electrical standards.

Grounding

Proper protective grounding and motor grounding are essential.

EMC

Because a variable-frequency drive generates high-frequency switching components, cable routing, shielding and grounding should be considered carefully.

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16. Application Selection Guide

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17. Key Advantages at a Glance

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18. Recommended Models by Application

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19. Practical Purchasing Checklist

Before purchasing or replacing a 20G11LF795JN0NNNNN, the following information should be checked:

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20. Overall Evaluation

The 20G11LF795JN0NNNNN is a specialized high-power AC drive rather than a general-purpose compact inverter.

Its strongest characteristics are the 690 VAC three-phase input class, 795 A output capability, approximately 800 kW normal-duty rating, high-power Frame 9 construction, air cooling and integrated EtherNet/IP networking.

It is particularly well suited to large pumps, fans, conveyors, blowers, compressors and other heavy industrial machinery.

The product is most attractive when a facility needs a standardized high-power drive platform that can communicate directly with an industrial automation network and provide controlled motor operation.

The main limitation is its physical size and very high power rating. For smaller motors, using a drive of this size would normally be unnecessary and economically inefficient.

For an engineering replacement, the most important point is not simply matching the model number. The motor voltage, full-load current, duty rating, overload requirement, braking requirement, enclosure, communication configuration and mechanical dimensions should all be matched.

For the exact 20G11LF795JN0NNNNN, the electrical parameters can be stated with good confidence, while the final height and exact weight in kg are configuration-dependent. I have deliberately not inserted a fabricated weight figure because an incorrect weight on a high-power cabinet drive can create problems for transportation, lifting and floor-loading calculations.

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21. Condensed Technical Specification

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22. Final Summary

The 20G11LF795JN0NNNNN is a high-capacity Allen-Bradley PowerFlex 755 AC drive designed for large industrial motor applications.

Its 690 VAC, 795 A configuration provides substantial motor-control capacity, with approximately 800 kW normal-duty and 710 kW heavy-duty capability.

Its combination of high-power motor control, air-cooled construction, industrial networking and flexible PowerFlex architecture makes it particularly appropriate for large pumps, fans, conveyors, blowers, compressors and heavy process machinery.

For same-series selection, the 20G11LF650JN0NNNNN, 20G11LF710JN0NNNNN, 20G11LF710JN2NNNNN, 20G11LF765JN0NNNNN and 20G11LF795JN0NNNNN provide useful comparison points.

For broader Allen-Bradley selection, the PowerFlex 525, PowerFlex 527, PowerFlex 40, PowerFlex 753 and related PowerFlex products cover significantly different power ranges and applications.

The most important selection rule is to match the drive to the actual motor current and load duty, rather than selecting only by motor kW. For a 795 A high-power drive, mechanical dimensions, ventilation, cable sizing, braking requirements, EMC considerations and exact configured weight should also be confirmed before installation.