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Allen-Bradley 20P41AD073RA0NNN PowerFlex DC Drive – Detailed Specifications, Product Introduction, Applications, Advantages, and Related Models

1. Product Overview

The Allen-Bradley 20P41AD073RA0NNN is a PowerFlex DC digital drive designed for industrial DC motor control applications requiring precise speed regulation, current regulation, controlled acceleration and deceleration, reversing, and regenerative operation.

This model is rated at 40 HP / 30 kW with a 73 A DC armature current rating. It is designed for a 460 V AC nominal, three-phase input, within the 380–480 V AC class.

The 20P41AD073RA0NNN is part of the PowerFlex DC 20P series and uses a regenerative four-quadrant configuration. This makes it particularly suitable for machinery where the motor may need to operate in both directions and where mechanical energy must be controlled during braking.

It is a relatively high-capacity model within the Frame A section of the 380–480 V PowerFlex DC range, making it useful for medium-to-heavy industrial machinery while retaining the general architecture of the smaller 20P models.

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2. Basic Product Parameters

The physical dimensions above correspond to the general Frame A dimensions used by this drive family. The actual cabinet space required should be larger than the drive’s physical envelope because wiring, airflow, maintenance access, and mounting clearance must also be considered.

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3. Detailed Electrical Specifications

The 20P41AD073RA0NNN is designed for 460 V AC nominal three-phase input and belongs to the 380–480 V AC PowerFlex DC drive group.

Its 73 A armature rating puts it above the 52 A / 30 HP model and makes it suitable for larger DC motor applications.

The 73 A rating provides a substantial current capacity for DC motor applications.

The correct selection should always be based on the actual motor nameplate ratings, including armature voltage, armature current, field voltage, field current, speed range, duty cycle, and mechanical load.

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4. Product Introduction

The 20P41AD073RA0NNN is a high-capacity member of the PowerFlex DC 20P series intended for industrial DC motor applications.

The drive provides digital regulation of motor speed and current and can operate in regenerative four-quadrant mode.

This allows the motor to accelerate, run, decelerate, and reverse under controlled conditions.

One of the main characteristics of this model is its 40 HP / 30 kW power rating combined with a 73 A armature current rating.

This places it in a useful range for industrial machines that require considerably more motor capacity than 20 HP or 30 HP systems but do not yet require the much larger Frame B or Frame C drive ratings.

The drive is also well suited to modernization projects involving existing DC motors.

Instead of replacing the entire mechanical system, a suitable digital DC drive can be used to modernize the electrical control portion of the machine while keeping the existing motor and mechanical equipment.

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5. Product Series

The 20P41AD073RA0NNN belongs to the PowerFlex DC 20P series.

The 20P family covers a wide range of motor ratings.

For the 380–480 V three-phase regenerative group, the series progresses from small DC motor ratings through substantially larger industrial drive ratings.

This makes it possible to stay within the same general drive family when machine power requirements change.

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6. 40 HP / 30 kW Capacity

The 40 HP / 30 kW rating is one of the main characteristics of the 20P41AD073RA0NNN.

This rating makes the drive suitable for larger industrial DC motors used in applications where a smaller 20 HP or 30 HP drive would not provide sufficient current capacity.

For a properly matched 40 HP DC motor, the 73 A rating provides the current capacity needed for normal operation and temporary overload conditions.

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7. Armature Current Control

The 73 A armature current rating is particularly important when the motor experiences high torque requirements.

In a DC motor, armature current has a direct relationship with motor torque.

Applications involving heavy starting loads, high inertia, acceleration requirements, or process disturbances can therefore require significant armature current capacity.

The 20P41AD073RA0NNN provides substantially more current capability than the 45 A and 52 A models.

This makes it a suitable choice for applications that fall into the 40 HP class.

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8. Four-Quadrant Operation

The 20P41AD073RA0NNN supports four-quadrant regenerative operation.

This means the drive can control the motor during both forward and reverse rotation while also controlling motoring and regenerative braking.

Four-quadrant control is particularly useful for machinery that needs frequent reversing.

It is also useful where the load can drive the motor during deceleration.

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9. Regenerative Operation

Regenerative operation is a major feature of the 20P41AD073RA0NNN.

When the motor is operating normally, electrical energy is converted into mechanical energy.

When the machine decelerates, the motor can become a generator.

The regenerative drive controls this generated energy and returns it through the regenerative power section.

This operating principle is particularly useful for:

• High-inertia machines
• Winding equipment
• Unwinding equipment
• Large rolls
• Reels
• Drums
• Drawing machines
• Metal-processing machinery
• Printing equipment
• Paper-processing equipment
• Machines with frequent acceleration and deceleration
• Machines requiring continuous regeneration

For these types of applications, regeneration can be an important part of the overall motion-control strategy.

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10. Regulated Field Supply

The drive provides a single-phase regulated field supply.

The field circuit controls the excitation of the DC motor.

Proper field regulation is important because field strength affects motor speed, torque, and operating range.

A regulated field supply can provide better control of motor operation than a basic uncontrolled field supply.

This becomes particularly useful when the machine operates over a wide speed range or when consistent motor behavior is required under changing load conditions.

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11. Input Configuration

The 20P41AD073RA0NNN uses a three-phase, 6-pulse AC input configuration.

The actual incoming power supply should be checked carefully before installation and commissioning.

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12. Overload Capability

The PowerFlex DC family is designed to handle temporary overload conditions.

The commonly specified overload capability is 150% for 60 seconds and 200% for 3 seconds.

For the 73 A model, the corresponding short-duration current levels can be expressed as follows:

These are short-term overload capabilities and should not be treated as continuous operating ratings.

The actual allowable duty depends on the complete application, including ambient temperature, motor characteristics, acceleration requirements, load profile, and thermal conditions.

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13. Physical Dimensions

The 20P41AD073RA0NNN uses the Frame A mechanical configuration.

The general Frame A dimensions are approximately:

The drive should be installed vertically with appropriate clearance around it.

The physical dimensions should not be confused with the complete cabinet installation dimensions. Additional clearance is necessary for airflow, power connections, control terminals, maintenance, and safe installation.

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14. Product Weight

The drive weight is approximately 11.5 kg.

The weight including packaging is approximately 13.5 kg.

The actual shipping weight can vary depending on packaging and included materials.

For cabinet installation and handling, approximately 11.5 kg should be used as a practical reference for the drive itself.

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15. Enclosure and Environmental Characteristics

The standard configuration uses an IP20 / NEMA/UL Type Open enclosure.

This means the drive is designed for installation inside a suitable electrical enclosure rather than direct exposure to outdoor environmental conditions.

The cabinet should protect the drive against:

• Water
• Excessive dust
• Corrosive materials
• Conductive contamination
• Mechanical damage
• Accidental contact

The drive’s conformal-coated electronics provide an additional level of protection for the internal circuitry, but conformal coating does not eliminate the need for proper cabinet protection.

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16. Conformal Coating

The 20P41AD073RA0NNN configuration includes conformal-coated electronics.

Conformal coating can help protect electronic components from certain environmental conditions such as humidity and contamination.

This feature is valuable in industrial environments where the electrical cabinet may be exposed to more challenging conditions than a clean office environment.

However, the drive should still be installed in an appropriately controlled enclosure.

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17. HIM and Communication Configuration

The standard configuration of this model is supplied with a blank plate rather than an integral HIM.

It also has no communication module as standard.

This configuration allows the drive to be integrated into a larger industrial control system rather than requiring the drive itself to contain a permanent operator keypad.

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18. Feedback Capability

The PowerFlex DC architecture supports DC tachometer and encoder feedback.

Feedback is particularly valuable when precise motor speed control is required.

For example, in a winding machine, motor speed may need to remain stable even though the material roll diameter changes.

In a metal-processing application, feedback can also help maintain stable line speed under changing mechanical loads.

Typical feedback applications include:

• Winding
• Unwinding
• Web handling
• Printing
• Paper processing
• Drawing
• Coating
• Metal processing
• High-precision speed regulation

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19. Standard I/O Capability

The PowerFlex DC platform provides extensive control I/O capability.

This makes it possible to connect the drive to external control devices, switches, sensors, analog references, speed commands, and process-control systems.

The standard architecture can support multiple digital and analog signals, making the drive suitable for integration into larger industrial automation systems.

This is particularly useful when the drive needs to receive commands from a PLC or process controller.

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20. Main Product Advantages

20.1 40 HP / 30 kW Power Rating

The 40 HP / 30 kW capacity makes the 20P41AD073RA0NNN suitable for medium-to-heavy industrial DC motor applications.

It provides significantly more capacity than the 20 HP, 25 HP, and 30 HP models in the same voltage group.

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20.2 73 A Armature Rating

The 73 A armature rating provides a substantial amount of current capacity.

This is important for applications where the motor needs high torque during acceleration or where the mechanical process produces significant load changes.

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20.3 Four-Quadrant Regenerative Operation

Four-quadrant regeneration allows the drive to manage motoring and braking in both directions.

This makes it suitable for machines with reversing motion and frequent deceleration.

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20.4 High-Inertia Load Capability

High-inertia machinery can be difficult to control because large rotating masses store substantial kinetic energy.

During deceleration, the regenerative system can actively manage this energy.

This makes the drive useful for large rolls, drums, reels, and other rotating equipment.

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20.5 Suitable for Existing DC Machinery

One of the most useful applications is modernization of existing DC equipment.

The drive can provide modern digital control while allowing an existing DC motor to remain in service when the motor is still mechanically and electrically suitable.

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20.6 Precise Speed and Current Regulation

Digital control provides controlled speed and current regulation.

This is useful in applications where motor speed must remain stable under changing mechanical loads.

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20.7 Feedback Support

The built-in feedback capability allows the system to be configured for more precise speed control.

This is especially important in process applications where line speed or tension must remain consistent.

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20.8 Regulated Field Control

The regulated field supply provides controlled field operation for the DC motor.

This can help support wider operating ranges and more consistent motor performance.

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20.9 Conformal-Coated Electronics

Conformal coating adds another level of protection to the drive electronics.

This can be useful in industrial environments with elevated humidity or contamination concerns.

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20.10 Compact Frame A Design

The 40 HP drive remains within the Frame A mechanical range for this voltage class.

This gives the model a relatively compact footprint considering its power rating.

That can be beneficial when replacing older equipment in an existing control cabinet.

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21. Typical Applications

21.1 Winding Machinery

Winding machinery is one of the classic applications for regenerative DC drives.

The motor must maintain controlled speed and torque as the material is wound onto a reel or roll.

As the roll diameter changes, the mechanical conditions change as well.

A feedback-controlled regenerative drive can help maintain stable operation while managing acceleration and braking.

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21.2 Unwinding Machinery

Unwinding machines require controlled braking because the material can drive the motor.

The regenerative capability of the 20P41AD073RA0NNN can provide controlled braking torque while the machine maintains its required line speed.

This makes the drive suitable for various web-handling processes.

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21.3 Paper Processing

Paper-processing machinery frequently contains large rolls and continuous material movement.

The drive can be used for appropriate DC motor applications where speed regulation and regenerative braking are required.

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21.4 Printing Equipment

Printing machinery can require accurate roller speed and controlled web movement.

The 20P41AD073RA0NNN can be applied to suitable DC motor systems where controlled speed, torque, and braking are important.

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21.5 Metal Processing

Metal-processing equipment can place substantial demands on the drive and motor.

Applications can include:

• Drawing
• Recoiling
• Strip handling
• Finishing
• Rolling-related equipment
• Tension control
• Material processing

The 73 A current rating provides additional capacity for these demanding applications.

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21.6 Extrusion Equipment

Some extrusion systems use DC motors because of their established speed and torque characteristics.

The drive can regulate motor operation while responding to changes in process load.

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21.7 Drawing Machines

Drawing machines can require controlled speed and torque over a wide operating range.

Regenerative operation can be valuable when the process repeatedly changes speed or requires controlled braking.

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21.8 Coating Lines

Coating machinery often requires accurate material speed and tension.

A feedback-controlled DC drive can be suitable for existing DC motor systems in these applications.

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21.9 Large Reels and Drums

Large reels and drums can contain significant rotating mass.

When the system decelerates, that stored mechanical energy must be managed.

The regenerative architecture provides a controlled method of handling this energy.

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21.10 Material Handling

Material-handling machinery can require controlled acceleration, braking, and reversing.

The four-quadrant capability makes the drive suitable for selected applications where a DC motor remains part of the machine.

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22. Application Characteristics

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23. Recommended Same-Series Models

The following five models are closely related PowerFlex DC regenerative drives in the same 380–480 V three-phase family.

These models provide a useful range around the 40 HP model.

The 20P41AD052RA0NNN is the closest lower-capacity option, while the 20P41AD086RA0NNN moves to the next larger power class.

The 20P41AD073RA0NNN sits between them at 40 HP / 73 A.

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24. Detailed Comparison of Related 20P Models

The dimensions are based on the common Frame A mechanical envelope. Actual product handling and packaging weights can vary.

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25. Five Same-Brand Related / Commonly Used Models

The following models are other commonly encountered PowerFlex products.

They are related products rather than direct substitutes because the 20P41AD073RA0NNN is a DC regenerative drive, while most of these models are designed for AC motors.

These models can be useful when comparing different PowerFlex technologies.

However, a PowerFlex 525, 753, or 755 should not be considered a direct drop-in replacement for a 20P DC drive without considering the motor type, motor control architecture, regenerative requirements, and mechanical system.

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26. Same-Brand Model Comparison

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27. Model Number Breakdown

The complete model number is:

20P41AD073RA0NNN

The catalog number identifies the general product family, voltage configuration, current rating, regenerative configuration, and option configuration.

The complete catalog number should be used when identifying or replacing the drive.

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28. Comparison With the Smaller Models

The 20P41AD073RA0NNN is part of a continuous power progression within the PowerFlex DC family.

This progression makes it easy to understand the position of the 73 A model.

It is the 40 HP class model between the 30 HP / 52 A version and the 50 HP / 86 A version.

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29. Cabinet Installation Requirements

Because the drive is IP20 / NEMA/UL Type Open, it is intended for protected cabinet installation.

The cabinet should provide suitable protection against environmental contamination and accidental contact.

The drive should normally be mounted vertically.

Adequate airflow is important because reduced airflow can increase the drive’s operating temperature.

Typical installation planning should include space around the drive for:

• Airflow
• Power terminals
• Control wiring
• Maintenance
• Inspection
• Cable bending radius
• Heat dissipation
• Other cabinet components

The drive itself measures approximately 267 × 359 × 287 mm, but the cabinet should not be designed with only these three dimensions in mind.

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30. Operating Environment

The drive should be installed in a clean, dry industrial control environment.

Potentially harmful conditions include:

• Excessive dust
• Oil mist
• Corrosive vapor
• Conductive contamination
• Excessive humidity
• Direct water exposure
• Excessive ambient temperature

The IP20 enclosure is primarily intended to provide protection against contact with enclosed electrical equipment rather than protection against environmental contaminants.

For harsher environments, the surrounding cabinet should provide the necessary protection.

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31. Retrofit Applications

The 20P41AD073RA0NNN can be particularly useful when upgrading older DC machinery.

A typical retrofit may involve an existing:

• 40 HP DC motor
• Motor tachometer
• Encoder
• Gearbox
• Coupling
• Roll
• Drum
• Winding system
• Production line

In this type of project, replacing the drive while retaining the existing mechanical equipment can be more straightforward than converting the entire machine to a new AC motor system.

The actual retrofit feasibility depends on the motor’s condition and electrical ratings.

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32. Important Selection Parameters

When selecting the 20P41AD073RA0NNN, the following parameters should be checked carefully:

The motor’s actual armature voltage and field specifications must be compatible with the drive.

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33. Main Advantages at a Glance

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34. Final Technical Summary

The Allen-Bradley 20P41AD073RA0NNN is a 40 HP / 30 kW PowerFlex DC regenerative drive with a 73 A armature current rating.

It is designed for 460 V AC nominal, three-phase input in the 380–480 V class and provides four-quadrant regenerative control for industrial DC motors.

Its major technical characteristics include:

• 40 HP / 30 kW rated power
• 73 A armature current
• 460 V AC nominal input
• 380–480 V AC input class
• Three-phase input
• 6-pulse input
• Regenerative operation
• Four-quadrant motor operation
• Single-phase regulated field supply
• DC tachometer and encoder feedback capability
• IP20 enclosure
• NEMA/UL Type Open construction
• Frame A
• Conformal-coated electronics
• No standard HIM
• No standard communication module
• Approx. dimensions: 267 × 359 × 287 mm
• Approx. drive weight: 11.5 kg
• Approx. packaged weight: 13.5 kg

The drive is particularly suitable for winding machines, unwinding machines, paper machinery, printing equipment, coating lines, drawing machines, metal-processing equipment, extrusion equipment, large reels, drums, material-handling systems, and other industrial machinery using medium-to-heavy DC motors.

The 73 A rating gives the model a substantial current capability compared with the smaller 35 A, 45 A, and 52 A versions.

Its regenerative four-quadrant architecture is especially valuable in applications where the motor must frequently accelerate, decelerate, reverse, or absorb mechanical energy from the load.

For existing DC machinery, the 20P41AD073RA0NNN can also be a practical modernization solution because the electrical control system can be upgraded while the existing motor and mechanical equipment may remain in service, provided their ratings and condition are suitable.

Overall, the 20P41AD073RA0NNN is a high-capacity PowerFlex DC 20P-series regenerative drive for industrial applications requiring 40 HP power, 73 A armature current, controlled DC motor speed and torque, four-quadrant operation, regenerative braking, regulated field control, and feedback-based speed regulation.