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Allen-Bradley 20G11TF370AN0NNNNN PowerFlex 755 AC Drive — Detailed Technical Specifications, Product Introduction, Applications, Advantages and Recommended Models

The Allen-Bradley 20G11TF370AN0NNNNN is a high-power PowerFlex 755 AC Drive designed for large industrial motor-control applications. It belongs to the PowerFlex 755 family and is intended for 690 VAC, three-phase systems where conventional compact variable-frequency drives are not suitable for the required motor power and current.

This model is a 370 A class high-power drive, with approximately 400 kW Light-Duty, 355 kW Normal-Duty and 300 kW Heavy-Duty ratings. It uses a large Frame 8 construction and forced-air cooling, making it particularly suitable for large conveyors, pumps, fans, blowers, crushers, mills, material-handling systems and other heavy industrial machinery.

One important point about this particular catalog number is the “A” configuration. The A version uses the filtered configuration with the common-mode capacitor jumper removed, whereas the corresponding J version has the jumper installed. The exact configuration should therefore be considered when replacing an existing drive or designing a new installation.

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1. Basic Product Information

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2. Brand: Allen-Bradley

The Allen-Bradley brand is widely used in industrial automation and motor-control systems, particularly in manufacturing plants, process industries, material-handling systems and large machine installations.

Its PowerFlex family includes compact drives for small motors, general-purpose drives for machine automation, and large high-power drives for industrial equipment.

The 20G11TF370AN0NNNNN belongs to the high-power section of this product range and is intended for applications where motor current, mechanical load and process requirements are considerably greater than those encountered with compact machine-level drives.

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3. Product Series: PowerFlex 755

The PowerFlex 755 is an architecture-level AC drive series designed for demanding motor-control applications.

It provides considerably more flexibility than a basic variable-frequency drive. Depending on the configuration, the platform can support different motor-control methods, feedback arrangements, communication architectures and application requirements.

The series is particularly appropriate for:

• Large conveyors
• Pumps
• Fans
• Blowers
• Mixers
• Mills
• Crushers
• Material-handling equipment
• Process machinery
• Large rotating equipment
• Heavy industrial machinery

The 20G11TF370AN0NNNNN is one of the high-power 690 VAC members of this family.

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4. Model Number: 20G11TF370AN0NNNNN

The catalog number can be understood as a combination of product family and configuration information.

The 370 portion is particularly important because it identifies the drive’s current class.

The A is also important because it distinguishes this version from the otherwise closely related 20G11TF370JN0NNNNN configuration.

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5. Main Electrical Parameters

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6. Duty Rating Explained

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

The 20G11TF370AN0NNNNN should not simply be called a “400 kW drive” for every application.

Its applicable motor power depends on the load type and the required overload capability.

This is one of the most important considerations when selecting a high-power drive.

A 400 kW fan may be a reasonable Light-Duty application, while a mechanically demanding 400 kW crusher would require a substantially different evaluation.

For heavy mechanical loads, the Heavy-Duty rating is normally the more meaningful reference.

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7. Light-Duty Rating — 400 kW

The Light-Duty rating is approximately 400 kW, or roughly 536 HP.

This rating is particularly suitable for applications where the motor operates with a relatively stable load and does not frequently require high overload torque.

Typical applications include:

• Large centrifugal fans
• Large ventilation systems
• Industrial blowers
• Large centrifugal pumps
• Cooling systems
• Air-handling systems
• Certain continuous process applications

For these applications, the drive can provide variable-speed operation while allowing the motor to operate closer to the actual process requirement.

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8. Normal-Duty Rating — 355 kW

The Normal-Duty rating is approximately 355 kW, equivalent to about 476 HP.

This is an important rating for general industrial machinery.

Typical applications include:

• Large conveyors
• Process conveyors
• Material-handling machinery
• Large pumps
• Industrial process equipment
• Production machinery
• Large rotating equipment

The 355 kW Normal-Duty rating makes this model a particularly attractive choice for large machines operating around the 300–350 kW range.

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9. Heavy-Duty Rating — 300 kW

The Heavy-Duty rating is approximately 300 kW, or about 402 HP.

This rating is especially relevant when the motor is driving a mechanically demanding load.

Examples include:

• Crushers
• Mills
• Heavy conveyors
• Large mixers
• Bulk-material handling equipment
• High-inertia machines
• Machines with frequent acceleration
• Machines with high starting torque

For such equipment, the engineer should focus on the actual motor current and torque requirements rather than selecting the drive based only on the maximum Light-Duty rating.

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10. Product Introduction

The 20G11TF370AN0NNNNN is a large industrial AC drive intended to control high-power three-phase motors.

Its 690 VAC voltage class makes it particularly suitable for large motor installations where higher motor voltage is used to manage current levels in high-power electrical systems.

With a 370 A current class, this is a substantial industrial drive.

The equipment should therefore be considered as part of a complete power-control system rather than as an isolated electrical component.

The incoming electrical system, motor, cabinet, cooling arrangement, grounding system, communication network and mechanical load all need to be considered together.

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11. Basic Operating Principle

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

A simplified power path is:

690 VAC Three-Phase Input → Rectifier / DC Bus → Inverter → Three-Phase Motor

The drive controls the inverter switching process to regulate motor operation.

By controlling output voltage and frequency, the drive can adjust motor speed.

Depending on the selected control method and system configuration, it can also provide sophisticated speed and torque control.

This makes the PowerFlex 755 platform suitable for applications where simple fixed-speed motor operation is insufficient.

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12. Variable-Speed Control

The most fundamental function of the drive is variable-speed motor operation.

A motor connected directly to a fixed-frequency power supply generally operates around a fixed speed determined by its design and supply frequency.

The drive changes the electrical operating conditions supplied to the motor.

This allows the machine to operate at different speeds according to process requirements.

Examples include:

• Slowing a conveyor when production demand decreases
• Adjusting pump speed according to flow requirements
• Adjusting fan speed according to airflow requirements
• Controlling mixer speed
• Coordinating multiple production machines

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13. Controlled Acceleration

Large motors can produce substantial mechanical stress during starting.

Direct starting can cause high electrical current and sudden mechanical torque.

A high-power drive can control the acceleration process.

This can help reduce stress on:

• Shafts
• Couplings
• Gearboxes
• Bearings
• Conveyor belts
• Pump assemblies
• Fan assemblies
• Mechanical transmissions

For large industrial equipment, smoother acceleration can be an important part of improving overall machine reliability.

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14. Torque Control

The PowerFlex 755 platform is designed for more advanced applications where torque control is important.

Torque-related control can be valuable in:

• Conveyors
• Mixers
• Material-handling machinery
• Winders
• Process machinery
• Heavy rotating equipment

In these applications, the motor may experience significant load changes.

The drive therefore needs to respond not only to speed commands but also to changing torque requirements.

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15. Embedded EtherNet/IP

The 20G11TF370AN0NNNNN includes embedded EtherNet/IP capability.

This is particularly useful when the drive needs to be integrated into a larger industrial automation network.

The control system can exchange information with the drive for functions such as:

• Start / stop control
• Speed reference
• Motor speed monitoring
• Current monitoring
• Drive status
• Fault information
• Alarm information
• Parameter management
• Diagnostic information

This network integration is particularly useful in large plants where numerous drives need to communicate with a central automation system.

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16. Filtered Configuration

The model is configured with filtering.

Filtering is important in industrial motor-drive installations because high-frequency switching can create electrical noise.

Appropriate filtering and system-level EMC design can help control unwanted electrical interference.

The final installation should still consider:

• Motor cable length
• Cable shielding
• Grounding
• Cabinet construction
• Cable separation
• Control wiring
• Communication wiring
• Motor-side electrical noise

Filtering within the drive does not eliminate the need for proper system-level EMC engineering.

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17. CM Jumper Removed — Meaning of the “A” Configuration

The A in 20G11TF370AN0NNNNN indicates that the common-mode capacitor jumper is removed.

The corresponding J configuration uses the common-mode jumper installed.

This distinction can be important in systems where grounding, EMC behavior, leakage current and the characteristics of the incoming power system need to be considered carefully.

Therefore, when replacing an existing drive, it is important to compare the complete catalog number rather than matching only the voltage and current rating.

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18. No Dynamic Braking

This model configuration does not include an integrated dynamic-braking transistor configuration.

This does not mean that the drive cannot be used in applications involving deceleration.

Instead, the braking requirements should be evaluated separately.

If the application involves:

• High-inertia loads
• Rapid deceleration
• Frequent stopping
• Regenerative energy
• Overhauling loads

then the braking strategy should be designed appropriately.

Depending on the application, additional braking or regenerative equipment may be required.

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19. No HIM / Blank HIM Configuration

The model is specified with a blank / no HIM configuration.

This means the drive does not rely on a standard local human-interface module as part of the catalog configuration.

In a large industrial installation, this can make sense when the drive is expected to be controlled and monitored primarily through the plant automation system.

A networked control architecture can provide operator commands and monitoring without requiring a local display on every drive.

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20. Forced-Air Cooling

At this power level, thermal management is a major design consideration.

The drive uses forced-air cooling to remove heat generated by the power electronics.

The cooling system should therefore be maintained carefully.

Important considerations include:

• Airflow
• Cooling fan operation
• Cabinet ventilation
• Ambient temperature
• Dust accumulation
• Air filters
• Heat dissipation
• Clearance around the drive

Poor cooling can significantly reduce the service life of electronic components.

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21. Mechanical Specifications

The following dimensions and weight should be treated as engineering reference values for this large Frame 8 configuration.

Exact physical dimensions can vary according to the selected mechanical arrangement, installation hardware and associated system components.

For cabinet fabrication, transportation planning and structural design, the final mechanical drawing should always take precedence over approximate dimensions.

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22. Size and Weight Considerations

The approximately 407 kg weight places this drive in a completely different installation category from compact VFDs.

A drive of this size requires proper consideration of:

• Cabinet floor loading
• Mounting structure
• Lifting equipment
• Transportation
• Installation access
• Door openings
• Maintenance access
• Cable routing
• Power-terminal access
• Cooling airflow

The physical installation should be planned before the electrical equipment is delivered.

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23. Main Product Advantages

23.1 High Power Capacity

The first major advantage is the high power capability.

With a Light-Duty rating of approximately 400 kW, the drive can control motors that are far larger than those normally handled by compact industrial VFDs.

This makes it suitable for large industrial machines and process systems.

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23.2 690 VAC Operation

The 690 VAC class is highly useful for large motor installations.

Higher motor voltage can reduce current for a given power level.

For large industrial systems, this can make motor power distribution more practical.

It is especially relevant to:

• Large conveyors
• Large pumps
• Industrial fans
• Mining equipment
• Process machinery
• Material-handling systems

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23.3 High Current Capacity

The 370 A current class provides substantial output capacity.

This makes the drive suitable for large motors where smaller PowerFlex drives cannot provide sufficient current.

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23.4 Flexible Duty Ratings

The three duty categories provide greater flexibility.

Instead of treating the drive as having only one power rating, engineers can evaluate the application according to:

• Continuous current
• Short-term overload
• Starting requirements
• Load torque
• Duty cycle
• Acceleration requirements

This makes selection more application-oriented.

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23.5 Industrial Networking

Embedded EtherNet/IP provides a straightforward way to integrate the drive into a networked automation architecture.

This can reduce the need for separate communication infrastructure and simplify drive monitoring and control.

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23.6 Advanced Motor Control

The PowerFlex 755 platform is designed for applications requiring more sophisticated control than simple V/Hz operation.

It can support different motor-control strategies depending on the selected system configuration.

This makes it suitable for machines where speed and torque response are important.

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24. Application: Large Conveyors

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

A conveyor motor may experience:

• High starting torque
• High inertia
• Variable material loading
• Long operating periods
• Frequent acceleration
• Different production speeds

The drive can provide controlled acceleration and adjustable operating speed.

This can reduce mechanical shock while also allowing the conveyor speed to be matched to the production process.

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25. Application: Mining and Bulk Material Handling

Large-scale material handling frequently requires motors in the hundreds of kilowatts.

Typical equipment includes:

• Ore conveyors
• Belt conveyors
• Crushers
• Feeders
• Transfer systems
• Bulk-material handling systems

The high-power 690 VAC configuration is well suited to this type of electrical architecture.

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26. Application: Large Pumps

Large pumps can benefit from variable-speed operation because the process does not always require maximum flow.

The drive allows pump speed to be adjusted according to process requirements.

Typical applications include:

• Industrial water systems
• Cooling-water systems
• Process-fluid systems
• Circulation systems
• Large pumping stations

In suitable variable-torque applications, reducing motor speed can also provide substantial energy-saving potential.

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27. Application: Large Fans and Blowers

Large fans and blowers are another important application.

A plant may need different airflow levels during different operating conditions.

Instead of keeping the motor at maximum speed and restricting airflow mechanically, the drive can adjust motor speed.

Potential benefits include:

• Better airflow regulation
• Lower operating speed
• Reduced mechanical stress
• Improved process control
• Potential energy savings

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28. Application: Crushers

Crushers are mechanically demanding machines.

They can experience large changes in load and significant torque requirements.

For this type of equipment, the Heavy-Duty rating should receive particular attention.

The drive should be selected based on:

• Motor current
• Starting torque
• Maximum torque
• Acceleration
• Load inertia
• Overload duration
• Operating cycle

The 300 kW Heavy-Duty rating makes the 20G11TF370AN0NNNNN a useful candidate for certain large crusher applications.

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29. Application: Mills

Large mills can place substantial mechanical demands on the motor.

The motor may experience:

• High starting torque
• Large inertia
• Variable load
• Long operating periods
• Frequent load changes

The PowerFlex 755 architecture is suitable for evaluating such applications where advanced motor control is required.

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30. Application: Mixers and Process Equipment

Large industrial mixers often require controlled acceleration and stable torque.

The load can change as materials are introduced or processed.

The drive can provide adjustable speed and controlled acceleration while allowing the motor to respond to changing process conditions.

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31. Application: Large Industrial Blowers

Industrial blowers often operate continuously.

The ability to adjust motor speed allows the process to be controlled according to actual airflow demand.

This can be particularly useful in:

• Industrial ventilation
• Furnace systems
• Process-air systems
• Combustion-air systems
• Dust-collection systems
• Large air-handling equipment

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32. Recommended Five Models From the Same Series

The following models are closely related 690 VAC high-power members of the PowerFlex 755 family.

These models form a useful progression for large 690 VAC motor applications.

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33. Same-Series Model Comparison

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34. Recommended Five Same-Brand Popular Models

The following models cover different power levels and product families and can be considered when comparing the 20G11TF370AN0NNNNN with smaller or alternative drive platforms.

The first three are compact drives, while the PowerFlex 753 and PowerFlex 755 platforms are more appropriate for larger and more demanding industrial equipment.

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35. Compact Drive vs. 20G11TF370AN0NNNNN

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36. Mechanical Advantages of the Frame 8 Design

The Frame 8 architecture allows the drive to handle substantially higher power than compact drive frames.

However, the trade-off is physical size.

A Frame 8 installation needs considerably more attention to:

• Cabinet structure
• Airflow
• Service access
• Cable routing
• Mechanical handling
• Heat dissipation

For a large industrial plant, these requirements are normally manageable, but they should be included in the engineering design from the beginning.

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37. Energy Efficiency Considerations

The drive itself should not be viewed as an automatic source of energy savings.

The actual savings depend heavily on the type of mechanical load.

Variable-torque applications such as centrifugal pumps and fans can provide particularly strong energy-saving opportunities because reducing speed can substantially reduce the power required by the load.

For constant-torque equipment, the energy-saving effect can be different.

The main benefit may instead be improved process control, controlled acceleration and reduced mechanical stress.

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38. Maintenance Recommendations

A high-power drive requires a proper preventive-maintenance program.

Important maintenance areas include:

The cooling system deserves particular attention because dust and heat can significantly affect electronic equipment.

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39. Installation Environment

The drive should be installed in an environment compatible with its industrial operating requirements.

Important environmental factors include:

• Ambient temperature
• Humidity
• Dust
• Corrosive substances
• Altitude
• Vibration
• Electrical noise
• Cabinet ventilation
• Cooling capacity

The Open Type construction means that the final enclosure or cabinet must provide the required environmental protection.

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40. Cabinet Design Requirements

A properly designed cabinet should account for both electrical and thermal requirements.

Because the drive is approximately several hundred kilograms, the cabinet structure must be designed accordingly.

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41. Important Selection Factors

Before selecting the 20G11TF370AN0NNNNN, engineers should check the following information from the motor and machine.

Motor Voltage

Confirm that the motor and electrical distribution system are compatible with the 690 VAC drive class.

Motor Full-Load Current

Motor current is one of the most important selection parameters.

Duty Cycle

Determine whether the application is Light Duty, Normal Duty or Heavy Duty.

Starting Torque

High starting torque can significantly affect the applicable drive rating.

Acceleration Time

Large-inertia equipment may require extended acceleration.

Load Inertia

The mechanical inertia of the driven equipment should be considered.

Braking Requirements

If the machine requires rapid deceleration, the braking architecture should be evaluated separately.

Environmental Conditions

Temperature, dust, humidity and altitude can affect drive operation.

Communication

If the drive will be integrated into a plant network, the communication architecture should be established during system design.

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42. Recommended Model by Application

These should be regarded as preliminary selection references. Final drive selection should always be based on the actual motor nameplate and mechanical load.

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43. Comparison: 330 A vs. 370 A vs. 415 A

The 20G11TF370AN0NNNNN occupies a useful middle position between the 330 A and 415 A models.

It provides a substantial increase in capacity over the 330 A version without moving immediately to the next higher 415 A class.

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44. Main Technical Advantages Summary

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45. Final Detailed Specification Table

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46. Overall Product Evaluation

The Allen-Bradley 20G11TF370AN0NNNNN is a high-power member of the PowerFlex 755 series, designed for large industrial motor applications where high voltage, high current, advanced control and industrial networking are required.

Its 370 A current class and approximately 400 kW Light-Duty, 355 kW Normal-Duty and 300 kW Heavy-Duty ratings give it a useful operating range across a variety of large industrial machines.

The 690 VAC three-phase architecture is particularly suitable for high-power motor systems, while the Frame 8 forced-air design provides the physical and thermal architecture required for this level of electrical power.

Its embedded EtherNet/IP capability is another important advantage for modern industrial automation systems because the drive can be integrated into a networked control architecture for command, monitoring and diagnostics.

The model is particularly well suited to large conveyors, pumps, fans, blowers, crushers, mills, mixers, material-handling systems and continuous process machinery.

The most important point when selecting this drive is not simply its maximum 400 kW rating. The actual application should be evaluated according to motor current, duty classification, overload requirement, starting torque, acceleration, load inertia, braking requirements and installation environment.

For a large industrial system around the 355 kW Normal-Duty range, the 20G11TF370AN0NNNNN is a particularly strong choice. It provides more capacity than the 330 A version while remaining below the 415 A and 460 A models in the same 690 VAC high-power family.

Its major strengths can therefore be summarized as high power, 690 VAC operation, substantial current capability, flexible duty ratings, advanced motor control, industrial Ethernet communication, forced-air cooling and suitability for large-scale industrial automation.