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Allen-Bradley 20G11LF960AN0NNNNN PowerFlex 755 AC Drive — Detailed Product Specifications, Introduction, Applications, Advantages and Recommended Models

The 20G11LF960AN0NNNNN is a high-power Allen-Bradley PowerFlex 755 AC Drive designed for large industrial motor-control applications.

It belongs to the PowerFlex 750-Series, with the specific product series being PowerFlex 755. It is intended for large three-phase motors where high current capacity, variable-speed operation, controlled acceleration and integration with an industrial automation system are required.

The drive is configured for a 690 VAC three-phase system with a rated output current of 960 A. Its power class reaches approximately 1,000 kW for light-duty applications, 900 kW for normal-duty applications and 800 kW for heavy-duty applications.

This is a large industrial drive rather than a compact general-purpose inverter. It is particularly appropriate for large pumps, fans, conveyors, blowers, compressors, mining equipment, water systems and heavy process machinery.

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1. Product Identification

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2. Brand and Product Series

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

It is intended for applications where motor control is closely connected with the plant automation system. Compared with a simple frequency converter, the PowerFlex 755 platform provides a broader range of control, communication, diagnostic and configuration functions.

The 20G11LF960AN0NNNNN represents a high-current 690 VAC configuration within this family.

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3. Product Overview

The 20G11LF960AN0NNNNN is designed to control very large three-phase AC motors.

Its 960 A rated current gives it enough capacity for motors operating in the hundreds-of-kilowatts range and, depending on the duty classification, around the 1 MW light-duty class.

The drive converts incoming three-phase AC electrical power into a controlled three-phase output for the motor.

By controlling the output frequency and voltage, the drive can regulate motor speed and provide controlled acceleration and deceleration.

This makes the product especially useful when a motor cannot simply be operated at full speed all the time.

For example, a large pump may only need 70% of its maximum flow for part of the day. A large fan may need different airflow levels depending on the process. A conveyor may need a controlled acceleration profile to prevent belt shock.

In these situations, a variable-frequency drive provides a much more flexible solution than a simple motor starter.

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4. Detailed Electrical Parameters

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5. Power and Duty Ratings

The 960 A rating should always be considered together with the application’s duty classification.

This distinction is important.

A motor rated at 850 kW, for example, cannot automatically be assumed to be suitable simply because the drive has a nominal 900 kW normal-duty rating.

The actual motor current, overload requirements, acceleration time, torque profile and duty cycle must be considered.

For high-inertia or high-torque equipment, the heavy-duty rating may be more relevant than the light-duty rating.

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6. Mechanical Specifications

The product belongs to the large-frame PowerFlex 755 range.

Its mechanical configuration is based on an 800 mm deep MCC-style arrangement.

The 800 mm specification refers to the mechanical depth class and should not be interpreted as meaning that the complete equipment is simply 800 × 800 × 800 mm.

For cabinet layout and installation planning, the exact dimensional drawing for the selected configuration should be used.

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7. Dimensions and Weight

Because this is a large industrial packaged drive, mechanical dimensions can depend on the exact arrangement.

For engineering use, the final weight should be taken from the actual configured equipment documentation.

This is especially important for lifting and transportation because the weight of a complete MCC-style package can differ substantially from the weight of the basic drive section.

The same principle applies to dimensions. The drive itself, the cabinet assembly and the final installation footprint are not necessarily identical.

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8. Product Configuration

The catalog configuration can be summarized as follows.

The complete catalog number should be retained when ordering replacement equipment.

A model with the same current and voltage can still have different filtering, common-mode, operator-interface or other configuration characteristics.

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9. Product Introduction

The PowerFlex 755 platform is designed for industrial motor applications where precise and reliable speed control is required.

The 20G11LF960AN0NNNNN is one of the larger configurations in this product family.

Its 960 A output capacity allows it to operate with very large AC motors.

The drive can regulate motor speed by varying the output frequency and voltage.

This provides several practical advantages over direct motor starting.

The motor can be accelerated gradually, operated at different speeds and stopped according to the requirements of the machine.

This is particularly useful for large process equipment because the mechanical system may have substantial inertia.

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10. How the Drive Works in an Industrial System

A typical application can be represented conceptually as:

Three-Phase 690 VAC Supply → PowerFlex 755 Drive → Large AC Motor → Mechanical Load

The drive receives the incoming electrical supply and controls the power delivered to the motor.

The industrial controller can provide commands such as:

• Start
• Stop
• Speed reference
• Direction
• Reset
• Operating mode

The drive can return information such as:

• Motor speed
• Output current
• Operating status
• Fault status
• Alarm status
• Drive condition
• Diagnostic information

This creates a connection between the electrical power system and the plant automation system.

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11. Main Applications

11.1 Large Pumping Systems

Large pumps are one of the most suitable applications for this drive.

Potential applications include:

• Municipal water pumping
• Industrial water supply
• Cooling-water systems
• Wastewater pumping
• Process-water circulation
• Mine dewatering
• Large irrigation systems
• Water-transfer systems
• Industrial utility systems

The ability to adjust motor speed allows the pump to respond to changing flow requirements.

This can also help reduce unnecessary operation at full speed when the process does not require maximum flow.

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11.2 Large Industrial Fans

Large fans can require hundreds of kilowatts of motor power.

Typical applications include:

• Mine ventilation
• Furnace fans
• Exhaust systems
• Process ventilation
• Cooling systems
• Combustion-air systems
• Industrial air-handling equipment

Variable-speed operation allows airflow to be adjusted to the actual process requirement.

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11.3 Heavy-Duty Conveyors

Large conveyors can create significant mechanical stress during starting.

A variable-frequency drive allows the motor to accelerate in a controlled manner.

Typical applications include:

• Mining conveyors
• Ore conveyors
• Cement conveyors
• Aggregate conveyors
• Port conveyors
• Bulk-material handling
• Heavy industrial production lines

Controlled acceleration can reduce shock loading on belts, gearboxes, couplings and other mechanical components.

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11.4 Mining Equipment

The 960 A capacity makes the drive suitable for very large mining-related electrical loads.

Potential applications include:

• Mine dewatering pumps
• Ventilation fans
• Ore conveyors
• Processing equipment
• Material-handling machinery
• Large auxiliary systems

For mining applications, environmental protection should be considered carefully because the basic Type 1/IP20 arrangement is normally intended for an appropriately protected electrical environment.

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11.5 Large Blowers

Large process blowers can benefit from variable-speed control.

Applications include:

• Furnace air
• Combustion air
• Dust collection
• Process-air systems
• Industrial ventilation
• Material processing
• Air-handling systems

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11.6 Large Compressors

Large compressors may require substantial motor current and controlled acceleration.

The PowerFlex 755 platform can be suitable for compressor applications where variable-speed motor operation is required.

The actual application should be evaluated according to compressor type, motor characteristics, starting torque, acceleration requirements and process control requirements.

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12. Product Advantages

12.1 960 A High-Current Capacity

The most obvious advantage is the 960 A output rating.

This makes the product suitable for very large motor systems.

Compared with a 710 A, 765 A or 795 A configuration, the 960 A version provides additional current capacity.

This can be useful where the motor has a higher full-load current or where the application requires greater operating margin.

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12.2 Approximately 900 kW Normal-Duty Capacity

The approximately 900 kW normal-duty rating places the drive firmly in the high-power industrial category.

It is suitable for applications far beyond the range of compact variable-frequency drives.

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12.3 Approximately 1 MW Light-Duty Class

The approximately 1,000 kW light-duty rating makes this a megawatt-class drive configuration.

It can therefore be considered for very large variable-torque applications where the overload requirements are relatively moderate.

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12.4 690 VAC Architecture

The 690 VAC class is particularly suitable for large industrial motors.

Higher motor voltage can help keep current within a manageable range when very large amounts of motor power are involved.

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12.5 Embedded EtherNet/IP

The integrated industrial communication capability makes the drive suitable for networked automation systems.

The drive can communicate operational and diagnostic information to a controller.

This can simplify plant-level monitoring and control.

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12.6 Air-Cooled Construction

Air cooling is a practical method of managing heat in large industrial drives.

It avoids the need for a dedicated liquid-cooling circuit.

The main requirement is adequate airflow and proper thermal design.

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12.7 Controlled Acceleration

Large motors can produce high starting current and mechanical stress.

Variable-frequency starting allows the motor to accelerate more smoothly.

This is particularly useful for:

• Conveyors
• Pumps
• Fans
• Blowers
• Large rotating machinery

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12.8 Industrial Diagnostic Functions

The PowerFlex 755 platform provides drive status and diagnostic information that can assist maintenance personnel.

This can help with:

• Fault analysis
• Preventive maintenance
• Troubleshooting
• Operating-condition monitoring
• Communication monitoring

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13. Dynamic Braking Consideration

The 20G11LF960AN0NNNNN configuration does not include dynamic braking.

This point is important for applications with large rotating inertia.

When a motor decelerates, mechanical energy can be transferred back toward the drive’s DC bus.

If the application requires repeated rapid deceleration, the braking strategy needs to be evaluated.

Potentially demanding applications include:

• Large centrifuges
• High-inertia fans
• Large conveyors
• Hoisting equipment
• Rapidly stopping rotating machinery
• Certain high-speed process machines

For these applications, the drive selection should consider the required stopping time and the amount of regenerative energy.

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14. EMC and Common-Mode Configuration

The model uses an EMC filter configuration with the CM capacitor/jumper arrangement removed.

This configuration should be considered together with the plant grounding system and motor-cable installation.

Important factors include:

• Motor cable length
• Cable shielding
• Grounding method
• Motor insulation
• Electrical-system grounding
• EMC requirements
• Leakage-current considerations

The filtering and common-mode configuration should not be changed without considering the complete electrical system.

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15. Communication and Control

The PowerFlex 755 platform is designed for integration into industrial automation networks.

A typical system can contain:

PLC / Controller → EtherNet/IP → PowerFlex 755 → Motor

The controller can send commands such as:

• Start
• Stop
• Speed reference
• Direction
• Reset

The drive can provide:

• Running status
• Motor speed
• Output current
• Fault information
• Alarm information
• Drive status
• Diagnostic data

For large factories, this can be particularly useful because many large motors can be monitored from centralized control equipment.

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16. Installation Considerations

Electrical Supply

The incoming supply should be a suitable 690 VAC three-phase industrial system.

The complete electrical installation must be designed around the actual drive current, short-circuit conditions and applicable protection requirements.

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Motor

The motor should be checked for:

• Rated voltage
• Full-load current
• Rated power
• Frequency
• Speed
• Power factor
• Efficiency
• Starting torque
• Maximum operating speed
• Insulation system

The motor’s rated current is particularly important when selecting between different PowerFlex 755 ratings.

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Motor Cable

At a 960 A current level, motor-cable design becomes a major part of the electrical installation.

The cable arrangement must account for:

• Current capacity
• Cable grouping
• Installation method
• Ambient temperature
• Cable length
• Voltage rating
• EMC
• Grounding
• Parallel conductors where required

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Ventilation

The drive is air cooled.

The installation therefore needs adequate ventilation.

The electrical room or cabinet should be designed so that heated exhaust air does not circulate back into the drive intake.

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17. Environmental Considerations

The IP20 / Type 1 construction is not intended to be treated as a sealed outdoor enclosure.

Where the equipment is installed in dusty, wet or chemically aggressive environments, additional environmental protection may be required.

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18. Recommended Same-Series / Closely Related Models

The following models are useful for comparison with the 20G11LF960AN0NNNNN.

They belong to the same PowerFlex 755 high-power family or are closely related configurations.

18.1 20G11LF710AN0NNNNN

This is a lower-current PowerFlex 755 configuration.

It can be considered where the motor’s full-load current is comfortably below 960 A and the application does not require the additional capacity of the larger drive.

It is particularly relevant to large pump and fan applications.

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18.2 20G11LF765AN0NNNNN

The 765 A configuration sits between the 710 A and 795 A classes.

It can be useful when a motor’s current requirement falls between those ranges.

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18.3 20G11LF795AN0NNNNN

The 795 A model is one of the closest electrical alternatives to the 960 A model.

It offers a lower current rating and is therefore appropriate where the motor load does not require the additional capacity of the 960 A version.

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18.4 20G11LF825AN0NNNNN

The 825 A configuration provides additional capacity over the 795 A version while remaining below the 960 A class.

It can be useful where the motor current is above the 795 A range but does not justify moving directly to the 960 A configuration.

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18.5 20G11LF960JN0NNNNN

This is the closest related configuration to the subject model.

It retains the 960 A / 690 VAC PowerFlex 755 electrical class while using a different configuration suffix.

For replacement work, the complete configuration should be compared carefully rather than assuming the two models are identical.

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19. Five Popular Allen-Bradley Models for Broader Comparison

The following models cover different parts of the PowerFlex range.

They are not direct replacements for the 960 A drive, but they are useful when choosing a drive for different motor sizes.

These models illustrate the broad range of applications covered by the Allen-Bradley PowerFlex family.

A PowerFlex 525 is much more appropriate for a small motor, while the PowerFlex 753 is useful for larger industrial equipment.

The PowerFlex 755 is intended for the demanding end of the industrial motor-control range.

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20. Same-Series Model Comparison

The current progression from 710 A to 960 A provides useful selection flexibility.

The correct choice should be based primarily on the motor’s actual current and duty requirements.

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21. Application Selection Table

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22. Product Advantages Compared With a Conventional Motor Starter

The drive does not simply turn the motor on and off.

It becomes part of the motor-control and process-control system.

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23. Product Advantages for Pumps and Fans

For centrifugal pumps and fans, speed control can be particularly valuable because process output often changes throughout the day.

Instead of operating continuously at maximum speed, the motor can operate closer to the required process point.

This can provide:

• Better process control
• Reduced mechanical stress
• Smoother operation
• Reduced unnecessary full-speed operation
• Easier integration with automatic process control
• Improved operating flexibility

The actual energy savings depend on the pump or fan characteristics, operating profile and system design.

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24. Product Advantages for Conveyors

For conveyors, controlled starting is often more important than simple speed adjustment.

A large conveyor can have considerable mechanical inertia.

Starting too aggressively can place stress on:

• Belts
• Gearboxes
• Couplings
• Bearings
• Shafts
• Drive pulleys
• Mechanical structures

A variable-frequency drive can provide a controlled acceleration profile.

This allows the conveyor to reach operating speed gradually.

The same principle applies to controlled stopping.

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25. Product Advantages for Mining

Mining machinery frequently operates with large motors and demanding mechanical loads.

The 960 A drive provides the electrical capacity required by many large mining motor applications.

It can be considered for:

• Conveyors
• Pumps
• Fans
• Material handling
• Processing equipment

The actual environmental protection must be designed according to the mining site.

A Type 1/IP20 drive installation normally requires appropriate electrical-room or cabinet protection.

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26. Maintenance and Service Considerations

Because this is a large industrial drive, preventive maintenance should be taken seriously.

Recommended maintenance considerations include:

A large drive can be a critical component of a production line.

Preventive maintenance can therefore be important for maintaining plant availability.

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27. Recommended Spare-Parts Strategy

For an installation using this type of drive, the spare-parts strategy should be based on the criticality of the motor and the plant’s maintenance philosophy.

A high-criticality conveyor, pump or fan may justify keeping selected drive-related spare components available.

The complete spare-parts strategy should consider:

• Drive availability
• Control components
• Cooling components
• Communication components
• Power components
• Fuses/protection components
• Installation accessories
• Replacement procedures

The exact spare-parts list should be established from the complete installed configuration.

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28. Important Selection Checklist

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29. Complete Technical Specification

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30. Five Related Models — Final Comparison

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31. Five Popular Models — Final Comparison

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32. Overall Product Evaluation

The 20G11LF960AN0NNNNN is a high-power Allen-Bradley PowerFlex 755 AC drive designed for large three-phase industrial motors.

Its key electrical characteristic is the 960 A output rating at 690 VAC.

With approximately 1,000 kW light-duty, 900 kW normal-duty and 800 kW heavy-duty capability, it belongs to the megawatt-class end of industrial variable-frequency drive applications.

Its strongest application areas are large pumps, industrial fans, mining conveyors, blowers, compressors, water systems and other large process machines.

The PowerFlex 755 platform also makes the product suitable for networked automation environments where the drive needs to exchange operating and diagnostic information with a plant control system.

The air-cooled construction makes it practical for appropriately designed industrial electrical rooms and MCC installations, while the 800 mm mechanical-depth class provides a large industrial cabinet format suitable for high-power equipment.

The main engineering points that deserve attention are the high electrical current, thermal management, motor-cable installation, cabinet space, grounding and EMC requirements.

The absence of dynamic braking is particularly important for applications involving rapid deceleration or high-inertia loads.

For procurement or replacement work, the complete catalog number 20G11LF960AN0NNNNN should be maintained rather than identifying the equipment only as a generic “960 A PowerFlex 755”.

The suffix determines important configuration characteristics, and a related 960 A model may not have exactly the same filtering, common-mode or other configuration.

In practical terms, the 20G11LF960AN0NNNNN can be described as a 690 VAC, 960 A, approximately 1 MW-class, air-cooled PowerFlex 755 industrial AC drive intended for large motor applications where high power, variable-speed operation, controlled acceleration and industrial automation integration are required.