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Allen-Bradley 20G11TF330AN0NNNNN PowerFlex 755 AC Drive — Detailed Product Specifications, Introduction, Applications, Advantages and Model Recommendations

The Allen-Bradley 20G11TF330AN0NNNNN is a high-power PowerFlex 755 AC Drive designed for large industrial motor-control applications. It is a 690 VAC, three-phase, air-cooled drive intended for demanding machinery where high motor power, reliable speed control, controlled acceleration, and integration with an industrial automation system are important.

This model is part of the high-power PowerFlex 755 range and uses a Frame 8 architecture. Its nominal catalog current is 330 A, with approximately 355 kW Light Duty, 315 kW Normal Duty, and 250 kW Heavy Duty ratings.

The drive is especially well suited to large conveyors, pumps, fans, blowers, mills, crushers, mixers, material-handling equipment, process machinery, and other large industrial rotating systems.

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1. Basic Product Information

*Dimensions and weight are practical planning values for the high-power Frame 8 class. The exact mechanical dimensions and final installed weight can vary with the configured assembly and accessories. For cabinet fabrication, lifting arrangements, and transportation planning, the applicable dimensional drawing for the exact configuration should be used.

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2. Brand

The 20G11TF330AN0NNNNN belongs to the Allen-Bradley brand.

Allen-Bradley is widely used in industrial automation, motor control, PLC systems, industrial networking, machine control, safety systems, and process automation.

Within its drive portfolio, the PowerFlex family covers a broad range of applications, from compact machine-level drives to large high-power industrial motor-control systems.

The 20G11TF330AN0NNNNN is positioned toward the large industrial end of this range.

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3. Product Series — PowerFlex 755

The 20G11TF330AN0NNNNN belongs to the PowerFlex 755 series.

The PowerFlex 755 series is designed for applications that require more than basic motor speed adjustment. It is intended for sophisticated industrial motor control where the drive may need to interact with a PLC, industrial Ethernet network, process-control system, or supervisory automation platform.

Typical characteristics of the PowerFlex 755 platform include:

• High-power AC motor control.
• Flexible speed regulation.
• Torque control capability.
• Industrial network integration.
• Modular architecture.
• Advanced motor-control functions.
• Large motor applications.
• Process-oriented automation.
• Conveyor and material-handling control.
• Pump and fan control.
• Heavy machinery control.

The 20G11TF330AN0NNNNN is specifically positioned in the 690 VAC high-power section of the PowerFlex 755 family.

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4. Model Number Explanation

The catalog number can be viewed as a series of configuration identifiers.

The most important part from a motor-sizing perspective is the 330 A current class.

It is important not to interpret “330” as the maximum motor power. The actual usable motor power depends on the duty classification.

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5. Main Electrical Parameters

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6. Understanding the 355 kW / 315 kW / 250 kW Ratings

The three power ratings are extremely important when selecting this drive.

The drive can have different allowable motor power depending on whether the application is classified as Light Duty, Normal Duty, or Heavy Duty.

This means that a 315 kW motor should not automatically be assumed to be suitable for every application.

If the machine has relatively stable loading, the Normal Duty rating can be considered.

If the machine experiences high starting torque, repeated overloads, or severe mechanical loading, the Heavy Duty rating becomes the more important selection criterion.

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7. Light Duty Operation — Approximately 355 kW

The Light Duty rating is approximately:

370 A / 355 kW.

This rating is particularly attractive for variable-torque applications.

Typical examples include:

• Large centrifugal pumps.
• Large centrifugal fans.
• Ventilation systems.
• Cooling-water systems.
• Process-air systems.
• Large blowers.
• Certain compressor applications.

In these applications, the motor load is often less demanding during acceleration and overload events than a crusher or heavily loaded conveyor.

That allows the drive to utilize a higher kW rating under Light Duty conditions.

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8. Normal Duty Operation — Approximately 315 kW

The Normal Duty rating is approximately:

330 A / 315 kW.

This is one of the key ratings of the model.

A 315 kW-class industrial motor operating under a relatively normal industrial load profile is one of the natural application areas for this drive.

Typical applications include:

• Large belt conveyors.
• Material-handling systems.
• Large industrial pumps.
• Large fans.
• General process machinery.
• Mixers.
• Production machinery.
• Industrial rotating equipment.

For a 315 kW motor, however, the actual motor full-load current should always be checked before final drive selection.

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9. Heavy Duty Operation — Approximately 250 kW

The Heavy Duty rating is approximately:

265 A / 250 kW.

This lower kW rating reflects the additional current capacity required for demanding overload conditions.

Heavy Duty applications can include:

• Crushers.
• Mills.
• Heavy conveyors.
• Large mixers.
• Material-processing equipment.
• High-inertia machinery.
• Equipment with frequent acceleration.
• Equipment requiring high breakaway torque.

For these applications, the correct selection method is to compare the motor’s actual current and overload requirements against the Heavy Duty rating.

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10. Product Introduction

The 20G11TF330AN0NNNNN is a large-frame industrial variable-frequency AC drive designed to control high-power three-phase motors.

The drive changes the frequency and voltage supplied to the motor, allowing the motor speed and torque to be controlled according to the requirements of the mechanical process.

This is particularly useful in industrial equipment where fixed-speed motor operation is inefficient, mechanically harsh, or unable to provide adequate process control.

Instead of running a motor continuously at full speed, the drive can adjust motor speed according to production demand.

For large industrial systems, this can improve process control while reducing mechanical stress and, in suitable variable-torque applications, potentially reducing energy consumption.

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11. Basic Operating Principle

The overall power-conversion process can be simplified as:

690 VAC Input → Rectifier / Converter → DC Link → Inverter → Variable-Frequency AC Output → Motor

The incoming three-phase AC power is converted into DC power.

The DC link provides an intermediate electrical energy path between the input converter and output inverter.

The inverter then converts the DC energy into controlled three-phase AC power.

By controlling the output frequency, voltage, and motor-control algorithm, the drive regulates the motor’s speed and torque.

This allows a large motor to accelerate smoothly, operate at controlled speed, and decelerate according to the programmed process requirements.

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12. Main Product Functions

12.1 Variable-Speed Motor Control

The most fundamental function is variable-speed control.

The motor does not have to remain at one fixed operating speed.

The drive can receive a speed reference from an automation controller, network, analog signal, or other configured control source.

This is useful when the production process changes throughout the operating cycle.

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12.2 Controlled Acceleration

Large motors can create considerable mechanical stress during direct starting.

The drive allows the motor to accelerate according to a programmed acceleration profile.

This can reduce stress on:

• Gearboxes.
• Shafts.
• Couplings.
• Bearings.
• Conveyor belts.
• Pump systems.
• Mechanical transmission components.

Controlled acceleration can also help prevent sudden process disturbances.

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12.3 Controlled Deceleration

The drive can also control motor deceleration.

A controlled stopping profile can reduce mechanical shock and provide smoother machine operation.

However, the specific 20G11TF330AN0NNNNN configuration does not include dynamic braking, so applications involving substantial regenerative energy require additional engineering consideration.

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12.4 Torque Management

The PowerFlex 755 platform is designed for applications where torque behavior is important.

This is useful for:

• Conveyors.
• Mixers.
• Mills.
• Crushers.
• Process machinery.
• Material-handling equipment.
• High-inertia machines.

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12.5 Industrial Network Integration

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

The control system can exchange information such as:

• Start command.
• Stop command.
• Speed reference.
• Actual speed.
• Motor current.
• Drive status.
• Fault status.
• Warning information.
• Diagnostic information.

This makes the drive suitable for larger automated production systems.

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13. Main Product Advantages

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14. Mechanical Specifications

The 20G11TF330AN0NNNNN is a large industrial drive and should be planned very differently from compact PowerFlex models.

These dimensions and weight values should be regarded as approximate planning values.

For a new cabinet design, the exact configured drive drawing should be used before steelwork, cable-entry positions, lifting points, doors, mounting rails, or service areas are finalized.

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15. Installation and Cabinet Considerations

Because the drive operates at 690 VAC and can handle hundreds of amps, installation planning is an important part of the application.

The system designer should consider:

• Cabinet dimensions.
• Floor loading.
• Cooling airflow.
• Ambient temperature.
• Cable routing.
• Cable bending radius.
• Grounding.
• EMC considerations.
• Maintenance access.
• Power isolation.
• Safe working space.
• Transportation route.
• Lifting equipment.
• Heat dissipation.

The approximate 300–400 kg weight means that lifting and positioning should normally be planned in advance rather than relying on manual installation.

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16. Cooling and Thermal Management

The drive uses forced-air cooling.

At this power level, heat generation is unavoidable.

Heat comes primarily from:

• Power semiconductor losses.
• Conduction losses.
• Switching losses.
• DC-link components.
• Auxiliary power circuits.

The cooling system transfers this heat away from the power electronics.

If cabinet ventilation is inadequate, internal temperature can increase significantly.

For this reason, cabinet designers should consider:

• Air inlet location.
• Air outlet location.
• Fan capacity.
• Ambient temperature.
• Dust accumulation.
• Filter maintenance.
• Minimum service clearance.
• Heat transfer to the surrounding room.

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17. Industrial Communication

Embedded EtherNet/IP is one of the useful features of the PowerFlex 755 platform.

A typical automation architecture could be represented as:

PLC / Industrial Controller → EtherNet/IP Network → PowerFlex 755 → 690 VAC Motor

The drive can be monitored and controlled from the automation system.

This reduces the need for large numbers of discrete control wires and makes it easier to exchange operating data.

For a large production line, this can be especially useful because the drive becomes part of the overall machine-control architecture rather than operating as an isolated component.

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18. Typical Applications

Large Belt Conveyors

Large conveyors are one of the most appropriate applications for this type of drive.

The drive can control conveyor speed and provide controlled acceleration.

This can help reduce:

• Belt shock.
• Gearbox stress.
• Coupling stress.
• Motor starting stress.
• Material movement disturbances.

Applications can include:

• Mining.
• Cement.
• Steel.
• Aggregate processing.
• Ports.
• Bulk-material handling.

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19. Pump Applications

Large industrial pumps can benefit from variable-speed operation.

Instead of operating a pump continuously at full speed and using mechanical valves to control flow, the motor speed can be adjusted according to process demand.

Potential benefits include:

• Better flow control.
• Improved pressure regulation.
• Reduced throttling losses.
• Lower mechanical stress.
• Potential energy savings.

The actual energy-saving potential depends on the hydraulic system, pump curve, operating point, and process requirements.

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20. Fan and Blower Applications

Large centrifugal fans and blowers are another strong application.

Fan systems frequently do not need to operate at maximum speed all the time.

Reducing motor speed when airflow demand is lower can substantially reduce power consumption in suitable systems.

Typical applications include:

• Industrial ventilation.
• Furnace air systems.
• Dust collection.
• Exhaust systems.
• Cooling systems.
• Process-air systems.
• Large air-handling equipment.

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21. Crusher Applications

Crushers can impose severe mechanical loads.

They may experience:

• High starting torque.
• Sudden load changes.
• Mechanical impact.
• High inertia.
• Overload conditions.

For this reason, the Heavy Duty 250 kW rating should be used when evaluating this model for a crusher.

The motor’s actual current and overload requirement should be checked rather than selecting the drive based only on motor kW.

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22. Mill Applications

Industrial mills can require significant torque and stable speed control.

The PowerFlex 755 platform can provide controlled motor operation while allowing the automation system to monitor drive status and operating parameters.

Potential applications include:

• Material mills.
• Processing mills.
• Grinding equipment.
• Production machinery.
• Industrial rotating equipment.

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23. Mixer Applications

Large mixers can have different torque requirements during startup and normal operation.

A controlled acceleration profile can reduce mechanical shock.

Variable-speed operation can also allow the production process to use different mixing speeds during different stages of operation.

This can be useful in:

• Chemical processing.
• Cement production.
• Food processing machinery.
• Material processing.
• Industrial batch systems.

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24. Material-Handling Applications

The drive is also suitable for large material-handling equipment.

Possible applications include:

• Conveyor systems.
• Bulk-material handling.
• Hoisting-related machinery where the braking architecture is correctly engineered.
• Transfer systems.
• Production-line material movement.
• Industrial elevators and lifting systems where the complete drive and braking configuration is appropriate.

For regenerative applications, braking requirements must be carefully evaluated because this particular catalog configuration does not include dynamic braking.

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25. Application Comparison

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26. Five Recommended Models from the Same Series

The following models are closely related PowerFlex 755 690 VAC high-power configurations.

These models form a useful progression when the motor rating changes.

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27. Same-Series Comparison

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28. Mechanical Comparison of Recommended Models

The physical size can vary depending on the final high-power configuration and system arrangement, so the values above are best used for preliminary planning.

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29. Five Popular Allen-Bradley Models

The following five models cover several commonly used drive classes, from compact machine control to large industrial motor control.

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30. Compact PowerFlex vs. 20G11TF330AN0NNNNN

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31. Advantages in Conveyor Systems

The 20G11TF330AN0NNNNN is particularly useful for large conveyors because it combines high current capacity with controlled motor operation.

A conveyor motor can accelerate according to a programmed ramp rather than applying maximum torque immediately.

This helps reduce mechanical stress on the complete drive train.

The drive can also allow conveyor speed to be adjusted according to material flow.

In a large material-handling plant, the embedded network capability makes it possible to integrate drive operation with the overall control system.

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32. Advantages in Pump Systems

For large pumps, variable-speed control can provide better control over flow and pressure.

When process demand decreases, the motor can operate at a lower speed rather than continuously operating at maximum speed.

This can potentially reduce electrical consumption, particularly in variable-torque applications.

The drive can also provide useful operating information to the automation system, allowing process engineers to monitor motor current, speed, status and faults.

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33. Advantages in Fan Systems

Large fans frequently operate under variable airflow requirements.

Operating a fan continuously at maximum speed is often unnecessary.

With a variable-frequency drive, fan speed can be adjusted according to actual airflow demand.

This can provide:

• Better airflow regulation.
• Reduced mechanical stress.
• Potential energy savings.
• Lower operating speed when demand is low.
• Improved process control.

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34. Advantages in Heavy Machinery

For heavy industrial machinery, the key benefit is controlled motor behavior.

A large motor may need to start against a heavy mechanical load.

The drive can manage acceleration rather than allowing the motor to experience an uncontrolled electrical and mechanical transition.

For applications with high overload requirements, the Heavy Duty rating must be considered carefully.

The 250 kW Heavy Duty rating is therefore more important than the 355 kW Light Duty rating when evaluating demanding machinery.

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35. Energy-Saving Potential

Variable-frequency drives can provide substantial energy-saving opportunities when applied to suitable loads.

The greatest potential is normally associated with variable-torque equipment such as:

• Centrifugal pumps.
• Centrifugal fans.
• Blowers.

For example, reducing the speed of a centrifugal fan can have a much larger impact on power consumption than simply reducing motor voltage.

However, the actual energy saving depends on the complete system.

Important factors include:

• Motor efficiency.
• Pump or fan efficiency.
• Operating point.
• Process demand.
• Mechanical transmission.
• System resistance.
• Drive efficiency.

Therefore, the drive should be considered as part of the complete motor-driven system rather than as an independent energy-saving device.

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36. Maintenance Considerations

A high-power drive requires proper preventive maintenance.

Important maintenance areas include:

Cooling Fans

Cooling fans should be inspected regularly because insufficient airflow can increase internal temperatures.

Airflow

Ventilation openings should remain unobstructed.

Heat-Sink Condition

Dust and contamination can reduce heat-transfer performance.

Electrical Connections

High-current connections should be inspected according to the applicable maintenance procedure.

Grounding

Grounding and bonding should be maintained correctly.

Cabinet Temperature

High ambient temperature can reduce equipment reliability and may require application-specific derating.

Motor Condition

A healthy drive cannot compensate for an electrically or mechanically defective motor.

Motor insulation, bearings, cables and mechanical loading should therefore also be monitored.

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37. Installation Environment

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38. Important Selection Factors

Before selecting the 20G11TF330AN0NNNNN, the following motor and application information should be checked.

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39. 265 A vs. 330 A vs. 370 A Class

The following three nearby models are useful when selecting around this power range.

The 20G11TF330AN0NNNNN is therefore a useful middle point in the 690 VAC PowerFlex 755 high-power range.

It provides a substantial increase over the 265 A class while remaining below the 370 A class.

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40. Recommended Model by Application

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41. Key Technical Advantages at a Glance

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42. Final Technical Specification Summary

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43. Overall Assessment

The Allen-Bradley 20G11TF330AN0NNNNN is a high-capacity PowerFlex 755 AC drive intended for large industrial motor applications.

Its 690 VAC input, approximately 330 A Normal Duty current, 355 kW Light Duty capability, 315 kW Normal Duty capability and 250 kW Heavy Duty capability place it firmly in the large industrial drive category.

For a 315 kW-class Normal Duty motor, this model is particularly attractive when the motor current and application duty requirements match the drive’s rating.

For variable-torque equipment such as large pumps, fans and blowers, the approximately 355 kW Light Duty capability provides a higher available power rating.

For more demanding machinery such as crushers, mills and heavily loaded conveyors, the 250 kW Heavy Duty rating is the more meaningful figure and should be used when sizing the system.

The embedded EtherNet/IP capability is another major advantage for modern industrial automation. It allows the drive to communicate operating commands, status and diagnostic information with the plant control system.

The forced-air Frame 8 construction makes the drive suitable for high-power continuous industrial operation, but it also means that cabinet ventilation, service clearance, lifting, transportation and thermal management must be planned carefully.

From a mechanical standpoint, the drive is substantially larger than compact PowerFlex products. A preliminary planning value of approximately 900 × 600 × 1000 mm and 300–400 kg is appropriate for considering cabinet space and handling requirements, while the final configured dimensions should be used for actual installation engineering.

Overall, the 20G11TF330AN0NNNNN is best suited to large-scale industrial applications where high motor power, 690 VAC operation, advanced speed and torque control, network integration and robust process automation are required.

For applications centered around 315 kW Normal Duty, this model represents a particularly useful point in the PowerFlex 755 690 VAC range, while the related 20G11TF265, 20G11TF370, 20G11TF415, and 20G11TF460 models provide practical alternatives when the motor current or duty requirement moves lower or higher.