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Allen-Bradley 20F11NB028JA0NNNNN PowerFlex 753 AC Drive — Detailed Specifications, Product Introduction, Applications, Advantages and Related Models

1. Product Overview

The Allen-Bradley 20F11NB028JA0NNNNN is a PowerFlex 753 AC Drive designed for variable-speed control of three-phase AC motors in industrial machinery and automation systems.

It is part of the PowerFlex 753 series within the PowerFlex 750-Series family. This particular configuration is designed for a 240/208 VAC, three-phase power system, with a rated output current of 28 A.

The drive is rated for approximately 10 HP under normal-duty operation and 7.5 HP under heavy-duty operation.

Unlike the IP54 / Type 12 packaged versions discussed for other 20F11 models, this particular NB configuration is an open-type drive, specified as IP20/IP00 and NEMA/UL Open Type. This makes it particularly suitable for installation inside an electrical cabinet or other appropriately protected enclosure.

The model uses Frame 3 construction, forced-air cooling, an EMC-filtered configuration with the CM jumper installed, a dynamic-braking transistor, embedded I/O and a blank front-panel configuration without a HIM.

The combination of relatively substantial motor capacity, built-in I/O and the PowerFlex 753 architecture makes this model suitable for conveyors, pumps, fans, feeders, processing equipment, material-handling machinery and other industrial motor-control applications.

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2. Brand and Product Series

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3. Detailed Technical Parameters

The dimensions and weight are useful planning values for the Frame 3 configuration. Because this is an open-type drive, the final installation must include an appropriate electrical enclosure and sufficient clearance for airflow, wiring and maintenance.

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4. Electrical Rating Explained

The 20F11NB028JA0NNNNN is a 28 A-class PowerFlex 753 drive.

Its normal-duty motor rating is approximately 10 HP, while its heavy-duty motor rating is approximately 7.5 HP.

This difference is important when selecting the drive for a machine.

Normal-duty applications generally have less severe overload requirements.

Heavy-duty applications may require higher short-term torque during acceleration, starting or temporary load increases. In this operating mode, the continuous current capacity is reduced so that the drive can provide the required overload performance.

The motor’s actual full-load current should always be checked before selecting the drive.

Horsepower is useful for initial selection, but the motor nameplate current and actual load profile are more important for final sizing.

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5. Product Introduction

The 20F11NB028JA0NNNNN is intended to regulate the speed and torque of three-phase AC motors in industrial equipment.

A variable frequency drive allows the motor to operate at different speeds instead of simply running at a fixed line frequency.

This provides greater control over the machine.

For example, a conveyor may need to run slowly during loading and increase speed during normal production.

A pump may need different speeds according to process demand.

A fan may need reduced speed during periods of lower airflow requirements.

A feeder may need precise speed adjustment to maintain a consistent material flow.

The drive can control these operating conditions electronically.

The PowerFlex 753 platform is designed for industrial applications where the drive may need to interact with a PLC, machine controller, sensors, communication network or other automation equipment.

The 20F11NB028JA0NNNNN also includes embedded I/O, which makes it practical for machine-control architectures that require direct control and status signals.

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6. Main Configuration Characteristics

The model combines several features into one industrial drive configuration:

• 240/208 VAC input class
• Three-phase operation
• 28 A normal-duty current class
• 10 HP normal-duty motor rating
• 7.5 HP heavy-duty motor rating
• Frame 3
• NEMA/UL Open Type
• IP20/IP00
• Forced-air cooling
• AC input with DC terminals
• Filtered EMC configuration
• CM jumper installed
• Dynamic-braking transistor
• Embedded I/O
• Blank HIM configuration

This combination makes the model particularly suitable for installation inside a properly designed industrial control cabinet.

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7. Open-Type Enclosure Explained

One of the most important characteristics of the 20F11NB028JA0NNNNN is its enclosure classification.

The model is specified as IP20/IP00 and NEMA/UL Open Type.

This means that it should not be treated like an IP54 / Type 12 packaged drive.

Instead, it is intended to be incorporated into a suitable electrical enclosure that provides the environmental protection required by the final machine installation.

This arrangement offers an important advantage for machine builders because the drive can be integrated directly into a larger control cabinet.

The cabinet can then be designed around the drive, PLC, contactors, circuit protection, terminal blocks, communication equipment and other electrical components.

It also allows the machine builder to manage airflow and heat dissipation as part of the overall enclosure design.

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8. Advantages of the Product

8.1 10 HP Normal-Duty Capacity

The 10 HP normal-duty rating gives this model a useful position in industrial machinery.

It can be used for medium-sized motors in applications such as:

• Conveyors
• Pumps
• Fans
• Blowers
• Feeders
• Rollers
• Mixers
• Material-handling equipment
• Processing machinery

The 28 A current class provides considerably more capacity than the smaller PowerFlex 753 models intended for 1–5 HP applications.

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8.2 Embedded I/O

Embedded I/O is one of the practical advantages of the PowerFlex 753 platform.

It allows the drive to interact directly with machine control signals without necessarily requiring every basic function to be handled through an external module.

Depending on the system design, the I/O can be used for:

• Start commands
• Stop commands
• Direction
• Speed reference
• Status feedback
• Fault signals
• Interlocking
• External control functions

This can simplify machine wiring and reduce the number of additional control components required.

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8.3 Dynamic-Braking Transistor

The built-in dynamic-braking transistor is useful in applications requiring controlled deceleration.

When a motor decelerates, the rotating mechanical load can return energy to the drive.

This regenerated energy can increase the DC-bus voltage.

A suitable braking resistor can dissipate this energy.

Dynamic braking can therefore be particularly useful for:

• Conveyors
• Rollers
• High-inertia machines
• Feeders
• Material-handling equipment
• Machinery requiring frequent stopping
• Applications with short deceleration times

The braking resistor must be selected according to the actual braking energy and duty cycle.

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8.4 EMC Filtering

The model uses a filtered EMC configuration.

This is useful in industrial installations where electrical noise must be controlled.

Variable frequency drives use high-frequency switching to generate their motor output waveform.

Without appropriate grounding and cable installation, this switching can introduce electromagnetic interference into surrounding equipment.

The EMC filtering arrangement, combined with appropriate wiring and grounding, can help improve the electromagnetic environment of the machine.

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8.5 Cabinet Integration

Because the model is an open-type drive, it is particularly well suited to cabinet-based machine design.

The drive can be installed alongside:

• PLCs
• Circuit breakers
• Contactors
• Motor protection components
• Terminal blocks
• Industrial communication modules
• Relays
• Power supplies
• Safety equipment

This makes it a practical choice for centralized electrical-control cabinets.

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8.6 Flexible Industrial Application

The PowerFlex 753 family covers a wide range of motor sizes and voltage classes.

Using a common drive family across several machines can simplify engineering.

A manufacturer may have machines using 5 HP, 10 HP, 15 HP and 20 HP motors.

Using related PowerFlex 753 models can make parameter management, troubleshooting and maintenance more consistent.

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9. Product Applications

9.1 Conveyor Systems

The 20F11NB028JA0NNNNN is well suited to conveyor applications within its current and motor-rating limits.

A conveyor often benefits from controlled acceleration.

Starting a loaded conveyor directly at full torque can produce mechanical shock.

A variable frequency drive allows the motor to accelerate gradually.

The drive can also provide controlled deceleration and adjustable operating speed.

Typical applications include:

• Manufacturing conveyors
• Packaging lines
• Assembly lines
• Parts transfer
• Material handling
• Warehouse machinery
• Processing conveyors

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9.2 Pump Applications

Pumps are one of the most common applications for variable frequency drives.

The drive can adjust pump speed according to process demand.

Applications include:

• Industrial water systems
• Process pumps
• Cooling systems
• Circulation systems
• Fluid transfer
• Pressure-control systems

For variable-torque pump applications, reducing motor speed can also reduce power consumption.

The actual energy savings depend on the pump and system characteristics.

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9.3 Fan and Blower Systems

Fans and blowers often do not need to operate at full speed continuously.

The drive can adjust motor speed according to the required airflow.

Applications include:

• Industrial ventilation
• Exhaust systems
• Cooling systems
• Dust collection
• Process ventilation
• Air circulation
• Industrial blowers

Controlled startup can also reduce mechanical stress on fan assemblies and drive components.

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9.4 Material Handling

Material-handling machinery often requires controlled speed and acceleration.

Examples include:

• Conveyors
• Rollers
• Feeders
• Transfer systems
• Sorting systems
• Packaging equipment

The dynamic-braking capability can be particularly useful when a moving load needs to stop quickly.

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9.5 Mixers

Mixers can impose substantial starting torque.

A mixer may require considerable torque to accelerate a loaded vessel.

The heavy-duty rating should therefore be considered carefully.

If the motor operates at the edge of the drive’s rating, the application should be evaluated according to the actual motor current and starting conditions rather than simply using the horsepower number.

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9.6 Processing Equipment

The drive can be used for various industrial processing machines.

Examples include:

• Rollers
• Feed mechanisms
• Material-processing equipment
• Production machinery
• Small machine tools
• Rotating process equipment

Variable-speed operation allows the machine process to be adjusted without changing the motor or mechanical transmission.

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10. Application Comparison

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11. Mechanical Specifications

The approximately 12 kg weight should be considered when designing the cabinet mounting structure.

The drive dimensions are approximately 551 mm high, 268 mm wide and 220.1 mm deep.

Because the drive is an open-type configuration, the total cabinet space required will be greater than these dimensions.

Additional space should be provided for:

• Power cables
• DC-bus connections
• Motor cables
• Control wiring
• Ventilation
• Maintenance
• Cable bending radius
• Adjacent electrical equipment

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12. Electrical Specifications

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13. Five Recommended Models from the Same Series

The following models are closely related PowerFlex 753 configurations and provide useful alternatives around the target model.

These models provide a convenient progression around the target model.

The 20F11NB017JA0NNNNN is a lower-capacity alternative for approximately 5 HP normal-duty applications.

The 20F11NB028JA0NNNNN is the 10 HP normal-duty model discussed in this article.

The 20F11NB042JA0NNNNN moves into the 15 HP class.

The 20F11NB054JA0NNNNN provides approximately 20 HP of normal-duty capacity.

The 20F11NB070JA0NNNNN increases the capacity to approximately 25 HP normal duty.

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14. Mechanical Comparison of Related Models

The mechanical progression is important when planning a cabinet.

The 5 HP, 10 HP and 15 HP models can remain within Frame 3, while larger capacity models move to larger frames.

This means that increasing electrical capacity may also require additional cabinet space.

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15. Five Popular Models from the Same Brand

The following models provide a broader comparison with other industrial drives from the same brand.

They are related products rather than direct replacements for the 20F11NB028JA0NNNNN.

The PowerFlex 525 models are generally more compact and are commonly used when a smaller and more streamlined drive solution is sufficient.

The PowerFlex 753 models are more appropriate when the application benefits from the architecture, embedded I/O and broader industrial integration capabilities of the 753 family.

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16. Comparison with the 600 V PowerFlex 753 Family

It is important to distinguish the 20F11NB028JA0NNNNN from models such as the 20F11GE series.

Both belong to the PowerFlex 753 family, but the electrical configuration is different.

This comparison demonstrates why catalog numbers must be checked carefully.

Two drives may have similar physical dimensions while having very different voltage and current characteristics.

A drive should never be selected simply because it physically fits the cabinet.

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17. Why the 20F11NB028JA0NNNNN Is Useful for Cabinet-Based Machines

The open-type configuration is especially attractive for machine builders.

A centralized control cabinet can contain the complete electrical system.

The drive can be installed alongside the PLC and other control components.

This provides a clean arrangement where:

• Incoming power enters the cabinet.
• Protection devices are installed near the power entry.
• The drive controls the motor.
• The PLC manages the machine sequence.
• I/O handles field signals.
• Communication modules connect the drive to the control network.
• Terminal blocks organize field wiring.

This type of architecture is common in industrial machinery because it allows the electrical system to be designed as one integrated unit.

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18. Conveyor Application

Consider a conveyor transporting components through a manufacturing line.

The conveyor motor may need to start smoothly to avoid sudden movement.

The drive can gradually increase motor frequency during acceleration.

Once the conveyor reaches operating speed, the drive can maintain the desired speed.

If the production line changes speed, the drive can follow the new reference.

At the end of a production cycle, the drive can decelerate the motor.

If rapid stopping is required, the dynamic-braking system can be evaluated.

This provides a much higher degree of control than a simple motor starter.

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19. Pump Application

In a pumping application, the process may require different flow rates at different times.

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

This can provide:

• Better process control
• Reduced mechanical stress
• Adjustable flow
• Controlled starting
• Controlled stopping
• Potential energy savings

For centrifugal pumps, the potential energy savings from reduced speed can be significant, although the actual savings depend on the pump and piping system.

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20. Fan Application

Fans often have variable process requirements.

A ventilation system may require maximum airflow during one production condition and much lower airflow at another time.

A variable frequency drive can adjust the fan speed accordingly.

This provides a more flexible system than simply turning the fan fully on or fully off.

Controlled acceleration also reduces the mechanical shock associated with direct starting.

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21. Material-Handling Application

Material-handling systems often require accurate speed control.

A conveyor or roller may need to synchronize with other machine sections.

The drive can adjust motor speed according to the production sequence.

This can help coordinate:

• Conveyor sections
• Feeders
• Rollers
• Transfer mechanisms
• Packaging systems
• Sorting equipment

The dynamic-braking capability can also be useful when a moving load needs controlled deceleration.

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22. Maintenance Considerations

The drive is an electronic power-conversion device, so proper environmental and electrical maintenance is important.

Routine inspection should include:

Because the drive is an open-type configuration, cabinet cleanliness is especially important.

Dust accumulation around ventilation paths can restrict airflow and increase operating temperature.

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23. Installation Considerations

The approximate drive dimensions are:

551 mm × 268 mm × 220.1 mm

with an approximate weight of:

12 kg.

The cabinet must provide additional space around the drive.

Important installation considerations include:

• Adequate ventilation
• Sufficient airflow
• Appropriate cabinet temperature
• Proper grounding
• Correct power-cable routing
• Correct motor-cable routing
• Separation of control and power wiring
• Adequate service clearance
• Correct cable bending radius
• Appropriate braking-resistor installation

Because the drive uses forced-air cooling, the cooling path should not be obstructed.

The surrounding cabinet components should also be arranged so that heat from other devices does not accumulate around the drive.

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24. Normal-Duty and Heavy-Duty Selection

The 10 HP normal-duty rating is useful for many general industrial applications.

However, a machine requiring heavy starting torque should be evaluated under the heavy-duty rating.

For example, a lightly loaded fan and a loaded conveyor may both use motors in the same horsepower range, but the mechanical requirements can be very different.

A conveyor may require substantial torque during acceleration.

A mixer may require high starting torque.

A fan may have relatively predictable torque characteristics.

For this reason, the motor’s actual full-load current and the machine’s load profile should be used for final drive selection.

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25. Selection Checklist

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26. Main Advantages at a Glance

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27. Overall Technical Assessment

The 20F11NB028JA0NNNNN is a 28 A-class PowerFlex 753 AC drive intended for 240/208 VAC three-phase applications.

Its 10 HP normal-duty rating makes it suitable for many medium-sized industrial motor applications.

The 7.5 HP heavy-duty rating provides a more conservative continuous rating for applications requiring higher short-term overload capability.

Its Frame 3 construction gives it approximate dimensions of 551 × 268 × 220.1 mm, with an approximate weight of 12 kg.

The IP20/IP00 NEMA/UL Open Type enclosure means that the drive should be installed within an appropriate protective cabinet or enclosure.

This is an important difference from packaged IP54 / Type 12 versions.

The combination of embedded I/O, EMC filtering, CM jumper configuration, dynamic-braking transistor and forced-air cooling makes the drive a versatile choice for industrial automation systems.

It is especially appropriate for machine builders who want to integrate the drive into a centralized control cabinet.

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28. Quick Specification Summary

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29. Final Recommendation

The 20F11NB028JA0NNNNN is a strong choice for a 240/208 VAC three-phase industrial motor in the approximately 10 HP normal-duty class.

Its combination of 28 A output capability, embedded I/O, dynamic braking, EMC filtering and Frame 3 construction makes it well suited to industrial machine applications where motor speed and torque need to be controlled as part of a larger automation system.

For applications below this capacity, the 20F11NB017JA0NNNNN provides a smaller 5 HP-class option.

For applications around 15 HP, the 20F11NB042JA0NNNNN is the logical next step.

For approximately 20 HP, the 20F11NB054JA0NNNNN provides additional capacity, while the 20F11NB070JA0NNNNN moves into the approximately 25 HP normal-duty class.

The most important point when selecting the drive is to match the motor voltage, motor full-load current, duty classification, load characteristics, acceleration requirements, braking requirements and enclosure arrangement.

For a cabinet-based industrial machine, the open-type design can be particularly convenient because the drive can be integrated directly into the machine’s electrical-control architecture.

Overall, the 20F11NB028JA0NNNNN offers a practical combination of medium motor capacity and industrial drive functionality, making it well suited to conveyors, pumps, fans, feeders, rollers, material-handling equipment and general-purpose automated machinery.