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Allen-Bradley 20G11TF370JN0NNNNN PowerFlex 755 AC Drive — Detailed Product Specifications, Introduction, Applications, Advantages and Model Recommendations

The Allen-Bradley 20G11TF370JN0NNNNN 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 with a 370 A normal-duty output-current rating, making it suitable for large motors used in conveyors, pumps, fans, blowers, crushers, mills, mixers, material-handling equipment and other demanding industrial machinery.

This model is a PowerFlex 755 Air-Cooled AC Drive, Frame 8, with an open-type construction, filtered configuration, common-mode jumper installed, AC input with precharge, DC terminals, embedded EtherNet/IP communication and no built-in dynamic-braking transistor or resistor arrangement.

The model provides approximately 400 kW Light-Duty, 355 kW Normal-Duty and 300 kW Heavy-Duty capability. This makes it a particularly useful choice for applications around the 300–400 kW range where the motor requires controlled acceleration, variable-speed operation, reliable torque control and integration with an industrial automation system.

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1. Basic Product Information

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2. Brand

The brand of the 20G11TF370JN0NNNNN is Allen-Bradley.

Allen-Bradley products are widely used in industrial automation, motor control, factory machinery, process equipment, material handling and large industrial installations.

Within the drive product range, the PowerFlex family covers everything from compact drives for small motors to large industrial drives designed for hundreds of kilowatts of motor power.

The 20G11TF370JN0NNNNN belongs to the high-power section of this range and is intended for applications where motor current, torque requirements and machine size are significantly greater than those normally associated with compact VFDs.

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3. Product Series

The 20G11TF370JN0NNNNN belongs to the:

PowerFlex 755 Series

It is also part of the broader:

PowerFlex 750-Series

The PowerFlex 755 is intended for applications requiring more than basic variable-frequency speed control.

It is designed for large industrial machines where the drive may need to provide:

• Variable-speed control
• Advanced motor control
• Torque control
• Feedback capability
• Industrial network communication
• Controlled acceleration and deceleration
• Large motor power handling
• Process-level integration
• Diagnostic and monitoring functions

The 20G11TF370JN0NNNNN is therefore much more than a simple frequency converter. It is a high-power industrial motor-control platform.

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4. Model Number Interpretation

The catalog number 20G11TF370JN0NNNNN contains several configuration identifiers.

The 370 portion is especially important because it identifies the drive’s normal-duty current class.

The J configuration is also important. In this version, the common-mode jumper is installed.

This differentiates the model from the closely related 20G11TF370AN0NNNNN, which uses the corresponding removed-jumper configuration.

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5. Main Electrical Parameters

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6. Power Rating Explained

One of the most important aspects of the 20G11TF370JN0NNNNN is that it has three different application ratings.

It should therefore not simply be described as a “400 kW drive” without explaining the duty classification.

The correct rating depends on the mechanical characteristics of the driven equipment.

A 400 kW centrifugal fan and a 400 kW crusher do not place the same demands on the drive.

The fan may operate with relatively stable torque characteristics, while the crusher may require significant starting torque and short-term overload capability.

For this reason, the motor nameplate current and the machine’s actual torque profile should always be considered together with the kW rating.

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7. Light-Duty Rating — 400 kW

The maximum Light-Duty application rating is approximately 400 kW.

This corresponds to approximately 536 HP.

Light-Duty operation is generally associated with applications where the motor does not frequently experience substantial overload conditions.

Typical examples include:

• Large centrifugal fans
• Industrial blowers
• Large centrifugal pumps
• Ventilation systems
• Cooling systems
• Air-handling equipment
• Certain process applications

For these applications, the drive can provide variable-speed operation while allowing the motor speed to follow process demand.

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8. Normal-Duty Rating — 355 kW

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

This rating is particularly useful for general industrial machinery.

Typical applications include:

• Large belt conveyors
• Material-handling systems
• Process machinery
• Large industrial pumps
• Production machinery
• Rotating equipment
• Bulk-material systems

For a motor in the 300–350 kW range, the 20G11TF370JN0NNNNN can provide a useful combination of power capacity and current capability.

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9. Heavy-Duty Rating — 300 kW

The Heavy-Duty rating is approximately 300 kW, equivalent to approximately 402 HP.

This is the rating that deserves particular attention for machines with higher torque demands.

Examples include:

• Crushers
• Mills
• Heavy conveyors
• Large mixers
• Material-processing equipment
• High-inertia machines
• Machines requiring significant starting torque

The Heavy-Duty rating is generally more relevant than the maximum Light-Duty figure when the application has severe acceleration or overload requirements.

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10. Product Introduction

The 20G11TF370JN0NNNNN is a high-power industrial AC drive designed for controlling large three-phase motors.

Its 690 VAC class makes it suitable for large industrial electrical systems where higher motor voltage is advantageous for managing current at high power levels.

With a normal-duty current rating of 370 A and a 355 kW Normal-Duty power rating, it is positioned toward the high-power end of the PowerFlex 755 range.

The drive is designed for cabinet or equipment-level installation rather than the type of simple wall mounting normally associated with small VFDs.

The complete installation needs to be engineered around the drive’s electrical, mechanical and thermal requirements.

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11. Basic Operating Principle

The drive receives three-phase AC electrical power and converts it into controlled electrical power for the motor.

The simplified power path can be described as:

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

The inverter controls the switching of the output power devices.

By adjusting the output voltage, frequency and control parameters, the drive can regulate motor speed and torque.

The actual control behavior depends on the selected motor-control method, motor characteristics, feedback configuration and application requirements.

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12. Variable-Speed Operation

The primary purpose of the drive is to provide controlled variable-speed operation.

A motor connected directly to a fixed-frequency supply normally operates close to a fixed operating speed.

With the PowerFlex 755, motor speed can be adjusted according to the process.

For example:

• A conveyor can run slowly during low production demand.
• A pump can reduce speed when less flow is required.
• A fan can operate at lower speed when less airflow is needed.
• A mixer can use different speeds during different production stages.
• A process machine can synchronize its speed with another machine.

This flexibility is one of the main reasons high-power drives are used in modern industrial equipment.

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13. Controlled Acceleration

Large motors can produce considerable mechanical shock when started directly across the supply.

The drive allows acceleration to be controlled.

Instead of immediately applying full operating conditions to the motor, the motor can be brought up to speed in a controlled manner.

This can help reduce mechanical stress on:

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

For large machines, controlled acceleration can be particularly valuable because even a small reduction in mechanical shock can have a meaningful effect over thousands of operating cycles.

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14. Speed Control

The drive can provide controlled motor speed according to a programmed reference.

The speed reference can originate from:

• Local control
• Automation controller
• Network command
• Analog reference
• Process-control system
• Machine sequence

This makes the drive suitable for both standalone machine control and larger plant-wide automation systems.

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15. Torque Control

The PowerFlex 755 platform is intended for applications where torque control is important.

Torque-related applications include:

• Large conveyors
• Mixers
• Material handling
• Process machinery
• Winders
• High-inertia rotating equipment
• Heavy-duty machinery

In these applications, the motor may experience rapidly changing mechanical loads.

The drive can therefore be configured for more sophisticated control than basic frequency adjustment.

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16. Embedded EtherNet/IP

The 20G11TF370JN0NNNNN includes embedded EtherNet/IP capability.

This is particularly useful in industrial automation systems where drives need to communicate with controllers and other automation equipment.

Typical information exchanged through the control network may include:

• Start commands
• Stop commands
• Speed references
• Drive status
• Motor speed
• Output current
• Fault information
• Alarm information
• Diagnostic information
• Operating status

This network integration can reduce wiring complexity and make drive monitoring more convenient.

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17. Industrial Network Integration

For a large production line, several drives may need to operate together.

For example, a material-handling system might contain:

• Main conveyor drive
• Feeder drive
• Crusher drive
• Transfer conveyor drive
• Auxiliary fan drive
• Pump drive

A networked architecture allows these systems to exchange control and status information.

The 20G11TF370JN0NNNNN can therefore form part of a larger coordinated automation system.

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18. Filtered Configuration

The model uses a filtered configuration.

Filtering is useful in industrial drive systems because inverter switching can produce high-frequency electrical noise.

Good system-level design should still include attention to:

• Motor cable routing
• Grounding
• Shielding
• Cable separation
• Control wiring
• Communication wiring
• Cabinet construction
• Motor cable length

The drive’s filtering should therefore be considered one part of the complete EMC design rather than the only EMC measure.

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19. Common-Mode Jumper Installed

The J in the model number indicates that the common-mode jumper is installed.

This is an important distinction from the A configuration.

The appropriate configuration depends on the electrical system, grounding arrangement and application requirements.

When replacing an existing drive, it is important to match the complete catalog number rather than selecting a replacement based only on voltage and current.

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20. AC Input With Precharge

The drive uses an AC input with precharge.

A high-power drive contains a substantial DC-bus capacitor system.

During energization, the precharge function manages the initial charging process of the DC bus.

This is especially important for a drive of this size because uncontrolled charging of the DC bus would place considerable electrical stress on the power-conversion components.

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21. DC Terminals

The drive configuration includes DC terminals.

The DC terminals provide additional flexibility for certain high-power system architectures.

They can be useful when designing systems that require DC-bus integration or coordinated power-conversion arrangements.

Their use should always be based on the complete electrical design and applicable installation requirements.

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22. No Internal Dynamic Braking

The specified configuration does not include an internal dynamic-braking transistor or resistor arrangement.

This is important for applications involving rapid deceleration or regenerative energy.

Applications that may require special braking consideration include:

• High-inertia machinery
• Rapid stopping
• Frequent deceleration
• Overhauling loads
• Large rotating equipment

If significant regenerative energy is expected, the braking architecture should be designed separately.

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23. No Door-Mounted HIM

The model is configured with a blank / no HIM arrangement.

This is often suitable for large industrial systems where the drive is installed inside a cabinet and operated primarily through the plant control system.

Instead of relying on a local display for routine operation, the drive can be integrated into the automation network.

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24. Forced-Air Cooling

The 20G11TF370JN0NNNNN uses forced-air cooling.

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

Heat is generated by:

• Power semiconductor switching
• Rectifier components
• Inverter components
• Internal electrical losses
• Control electronics

The cooling fans move air through the drive to remove heat.

For reliable operation, the cooling path should be kept clean and unobstructed.

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25. Mechanical Specifications

The 20G11TF370JN0NNNNN is a Frame 8 high-power drive, so its physical dimensions are considerably larger than those of compact PowerFlex products.

Because exact dimensions can vary with the installation arrangement and associated hardware, the following values are best used as engineering reference values.

The exact mechanical drawing should be used for final cabinet fabrication, lifting arrangements, transportation planning and installation.

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26. Dimensions and Weight Considerations

The physical size of this drive is an important difference between the PowerFlex 755 high-power range and compact drives.

A unit in the several-hundred-kilogram class requires planning for:

• Cabinet structure
• Floor loading
• Transportation
• Lifting
• Installation access
• Maintenance space
• Cable routing
• Ventilation
• Service clearance

The cabinet should be designed to support both the drive weight and the additional weight of associated power equipment.

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27. Main Product Advantages

27.1 High-Power Capability

The most obvious advantage is its high-power output capability.

With approximately 400 kW Light-Duty capacity, this model is suitable for motors that are far beyond the normal range of compact machine drives.

This makes it suitable for large-scale industrial machinery.

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27.2 690 VAC Voltage Class

The 690 VAC configuration is particularly useful for large motors.

At high power levels, higher voltage can help reduce current for a given motor power.

This can make the overall electrical distribution system more practical.

It is especially useful in:

• Large process plants
• Mining equipment
• Large conveyors
• Pumping systems
• Large fans
• Material-handling equipment

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27.3 370 A Current Capability

The 370 A normal-duty current rating gives the drive substantial output capability.

This provides the electrical capacity needed for large industrial motors.

It also places the model in a useful position between smaller 330 A-class equipment and larger 415 A-class models.

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27.4 Flexible Duty Ratings

The three duty categories provide useful flexibility.

The same drive can be evaluated for:

• 400 kW Light-Duty
• 355 kW Normal-Duty
• 300 kW Heavy-Duty

This allows the engineer to select the appropriate operating mode based on the actual mechanical load.

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27.5 Industrial Ethernet Communication

Embedded EtherNet/IP makes the drive well suited to networked automation.

This can simplify:

• Drive control
• Monitoring
• Diagnostics
• Parameter management
• Machine coordination

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27.6 Advanced Motor Control

The PowerFlex 755 platform is intended for more demanding motor-control applications.

It can support applications requiring:

• Precise speed control
• Torque control
• Feedback
• Coordinated operation
• Process control

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28. Application: Large Conveyors

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

A large conveyor may experience:

• High starting torque
• High inertia
• Variable loading
• Long running periods
• Different operating speeds
• Frequent starts and stops

Controlled acceleration can reduce mechanical shock.

Variable-speed operation also allows the conveyor to be matched to production requirements.

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29. Application: Mining Conveyors

Mining conveyors can require hundreds of kilowatts of motor power.

The motor may need to move large amounts of material over long distances.

The drive can provide:

• Controlled starting
• Adjustable speed
• Torque control
• Network monitoring
• Fault diagnostics

The 690 VAC configuration is also well suited to large industrial electrical systems.

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30. Application: Large Pumps

Large pumps are another important application.

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

Variable-speed operation allows pump speed to be adjusted according to:

• Flow
• Pressure
• Process demand
• Production requirements

For suitable centrifugal-pump applications, reducing speed can also provide significant energy-saving potential.

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31. Application: Large Fans

Large industrial fans frequently operate for long periods.

The required airflow may change throughout the process.

A variable-frequency drive allows fan speed to be adjusted rather than keeping the motor continuously at maximum speed.

This can improve:

• Airflow control
• Process stability
• Energy management
• Starting performance
• Mechanical stress

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32. Application: Industrial Blowers

Industrial blowers may be used in:

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

The ability to control speed makes the drive suitable for processes where airflow requirements change.

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33. Application: Crushers

Crushers are demanding applications because of their high mechanical torque requirements.

The machine can experience sudden load changes.

For this reason, the 300 kW Heavy-Duty rating should receive particular attention when evaluating this drive.

Important factors include:

• Starting torque
• Motor current
• Acceleration time
• Load inertia
• Overload duration
• Mechanical load profile

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34. Application: Mills

Large mills can require high motor torque and significant acceleration capability.

The drive may need to operate for long periods while responding to changing load conditions.

The PowerFlex 755 architecture is suitable for evaluating this type of application.

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35. Application: Mixers

Large industrial mixers may have very different load characteristics depending on the material being processed.

The motor may need:

• High starting torque
• Controlled acceleration
• Adjustable speed
• Stable torque
• Variable operating speeds

The 20G11TF370JN0NNNNN is suitable for consideration in large mixer systems when its current and duty ratings match the motor requirements.

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36. Application: Material Handling

Material-handling systems often use multiple large motors.

Examples include:

• Belt conveyors
• Transfer conveyors
• Feeders
• Hoisting-related equipment
• Bulk-material systems
• Processing lines

Networked drive control can make coordination between different sections of the system easier.

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37. Application Suitability Table

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38. Five Recommended Models From the Same Series

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

These models provide a logical progression in current and power capacity.

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39. Same-Series Comparison

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40. Same-Series Mechanical Comparison

Because these models are all in the same high-power Frame 8 class, their mechanical requirements are broadly similar.

Exact mechanical dimensions and final shipping weight should be confirmed against the particular configuration before cabinet fabrication or transport planning.

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41. Five Popular Models From the Same Brand

For comparison, the following models represent several different power levels within the same brand’s PowerFlex product range.

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42. Compact PowerFlex Drives vs. 20G11TF370JN0NNNNN

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43. Why Choose the 20G11TF370JN0NNNNN Instead of the 330 A Model?

The 20G11TF330JN0NNNNN provides approximately 315 kW Normal-Duty capability, while the 20G11TF370JN0NNNNN increases the Normal-Duty rating to approximately 355 kW.

This makes the 370 A model attractive when the motor is larger or when additional current capacity is needed.

The 370 A model is particularly useful when:

• The motor is around 355 kW
• The conveyor has a substantial load
• The process requires higher continuous current
• Additional operating margin is desirable
• The machine has more demanding torque requirements

However, selecting a larger drive simply for additional margin is not always the best approach.

The motor’s actual nameplate current and duty cycle should remain the primary selection criteria.

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44. Why Choose the 415 A Model Instead?

The 20G11TF415JN0NNNNN provides approximately:

• 450 kW Light Duty
• 400 kW Normal Duty
• 355 kW Heavy Duty

Compared with the 370 A model, it provides a higher power and current class.

It may therefore be a better choice when the motor approaches 400 kW in Normal Duty or when a heavy-duty application approaches the 355 kW range.

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45. Why Choose the 265 A Model?

The 20G11TF265JN0NNNNN is the lower-capacity option among the recommended models.

It provides approximately:

• 315 kW Light Duty
• 250 kW Normal Duty
• 200 kW Heavy Duty

It can therefore be more appropriate when the motor is smaller and the higher capacity of the 330 A or 370 A model is unnecessary.

This can help reduce equipment cost and avoid unnecessary oversizing.

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46. Energy-Saving Advantages

Variable-frequency drives can provide substantial energy-management benefits, particularly with variable-torque loads.

Large centrifugal pumps and fans are good examples.

When the process requires less flow or airflow, the motor speed can be reduced.

This can be more efficient than operating the motor at full speed continuously and restricting the process mechanically.

The actual energy savings depend on:

• Load characteristics
• Operating speed
• Operating hours
• Process demand
• Motor efficiency
• Pump or fan efficiency
• Drive losses
• Mechanical transmission efficiency

The drive should therefore be viewed as an important part of an energy-management strategy rather than as an automatic fixed-percentage energy-saving device.

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47. Mechanical Stress Reduction

The drive can also provide mechanical benefits.

Controlled acceleration and deceleration can reduce sudden torque changes.

This can help reduce stress on:

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

For equipment operating continuously over many years, reducing repeated mechanical shock can be valuable.

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48. Maintenance Advantages

A large industrial drive requires a proper preventive-maintenance program.

Cooling-system maintenance deserves particular attention.

Dust accumulation can restrict airflow and increase operating temperature.

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49. Cooling and Thermal Management

The drive’s forced-air cooling system should be treated as a critical component.

A large industrial drive can generate considerable heat during operation.

The installation should therefore provide adequate airflow.

Important considerations include:

• Cabinet ventilation
• Ambient temperature
• Fan condition
• Air filters
• Airflow direction
• Heat extraction
• Cabinet spacing
• Dust control

The drive should not be installed in a cabinet where heat from other equipment causes the internal temperature to exceed the applicable operating limits.

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50. Installation Environment

The installation environment can have a significant impact on long-term reliability.

The following conditions should be evaluated:

• Ambient temperature
• Humidity
• Dust
• Corrosive gases
• Vibration
• Altitude
• Electrical noise
• Cooling conditions
• Cabinet protection

Because the drive is an Open Type product, the final cabinet must provide the appropriate environmental protection.

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51. Cabinet Design Considerations

The cabinet should be designed around the actual drive configuration rather than simply around the nominal drive dimensions.

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52. Important Selection Factors

Before choosing the 20G11TF370JN0NNNNN, the following parameters should be checked.

Motor Voltage

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

Motor Full-Load Current

This is one of the most important selection parameters.

Duty Classification

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

Starting Torque

High starting torque can reduce the applicable motor power rating.

Acceleration Time

Large-inertia loads may require longer acceleration.

Load Inertia

The mechanical inertia of the machine should be evaluated.

Braking

Applications requiring rapid deceleration should receive a separate braking analysis.

Ambient Temperature

Cabinet temperature directly affects thermal performance.

Communication

Determine how the drive will communicate with the automation system.

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53. Recommended Model by Application

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54. 20G11TF370JN0NNNNN — Key Technical Strengths

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55. Final Technical Specification Table

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56. Overall Product Evaluation

The Allen-Bradley 20G11TF370JN0NNNNN is a high-power PowerFlex 755 AC Drive designed for large industrial motor-control systems.

Its 690 VAC three-phase input, 370 A normal-duty current rating, approximately 400 kW Light-Duty rating, 355 kW Normal-Duty rating and 300 kW Heavy-Duty rating place it firmly in the high-power industrial drive category.

The model is particularly well suited to applications where motor power, mechanical load and operating requirements are too demanding for compact variable-frequency drives.

Its strongest application areas include large conveyors, mining conveyors, pumps, fans, blowers, crushers, mills, mixers, material-handling equipment and process machinery.

The embedded EtherNet/IP capability makes it suitable for integration into networked industrial automation systems, while the forced-air cooling system provides the thermal-management architecture required for high-power operation.

The Frame 8 construction also gives the product a substantial physical footprint. For engineering purposes, the approximate mechanical envelope can be considered in the 900 × 1000 × 500 mm class, with an overall equipment weight in the 300–400 kg class, although the exact dimensions and weight should be confirmed against the final mechanical configuration before cabinet fabrication and transportation planning.

The J configuration is another important characteristic of this model. It indicates the common-mode jumper-installed configuration and distinguishes the model from the closely related 20G11TF370AN0NNNNN configuration.

For general industrial equipment around the 355 kW Normal-Duty range, this model offers a strong balance between power capacity and system flexibility.

For applications below this range, the 20G11TF330JN0NNNNN may be sufficient. For larger loads, the 20G11TF415JN0NNNNN or 20G11TF460JN0NNNNN provides additional capacity.

Overall, the 20G11TF370JN0NNNNN can be considered a large-capacity industrial drive for demanding 690 VAC motor applications, combining high current capability, flexible duty ratings, advanced motor control, industrial Ethernet communication, forced-air cooling and cabinet-level integration into one high-power drive platform.