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Allen-Bradley 20P41AD086RA0NNN PowerFlex DC Drive – Complete Product Specifications, Applications, Advantages and Related Models

1. Product Overview

The Allen-Bradley 20P41AD086RA0NNN is a PowerFlex DC digital drive designed for industrial DC motor control applications where stable speed regulation, controlled torque, regenerative braking, and four-quadrant operation are required.

It is rated at 37 kW / 50 HP with an 86 A DC output current rating. The drive is designed for a 460 V AC nominal, three-phase input system, within the 380–480 V AC voltage class.

The 20P41AD086RA0NNN is a regenerative drive, which means it can actively control both motoring and regenerative braking conditions. This makes it particularly useful for machinery with frequent acceleration and deceleration, reversing operation, high inertia, overhauling loads, or continuous regeneration.

The product belongs to the PowerFlex DC family, Series 20P, and uses a Frame A construction. Its standard configuration includes an IP20 / NEMA/UL Type Open enclosure, conformal-coated electronics, a blank plate in place of a HIM, and no communication module in the standard catalog configuration.

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2. Basic Product Parameters

The 86 A rating is the main electrical sizing parameter of this model. For DC motor applications, the actual motor armature current should be checked carefully instead of selecting the drive from horsepower alone.

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3. Product Identification

The catalog number identifies a specific regenerative DC drive configuration rather than a general-purpose AC variable-frequency drive.

This distinction is important because the PowerFlex DC family is designed around the control requirements of DC motors, including armature control and regulated field operation.

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4. Product Introduction

The 20P41AD086RA0NNN is intended for industrial machinery that uses a medium-power DC motor and requires more sophisticated control than a basic DC motor starter can provide.

The drive regulates motor operation electronically and can control speed, current, acceleration, deceleration, braking, and field operation according to the configured control strategy.

Its 50 HP / 37 kW rating places it in a useful medium-power range for industrial production equipment.

The 86 A armature current rating gives the drive the capacity required by many 50 HP DC motor installations, while the regenerative architecture allows the motor to transition between motoring and braking conditions without relying solely on mechanical braking.

The design is particularly suitable for machines that operate continuously or cyclically and need repeatable speed control.

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5. Product Series

The product belongs to the:

PowerFlex DC Series

and uses the:

20P Series

The 20P family is designed for industrial DC motor control and includes both regenerative and non-regenerative configurations across a broad range of power ratings.

For the 380–480 V three-phase regenerative family, the capacity range extends from small DC motor applications to several hundred horsepower.

The 20P41AD086RA0NNN is positioned at:

37 kW / 50 HP / 86 A

within this product family.

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6. Electrical Specifications

6.1 Input Voltage

The drive is intended for a 460 V AC nominal three-phase supply and belongs to the 380–480 V AC voltage class.

This makes it suitable for industrial electrical systems using three-phase medium-voltage-class low-voltage distribution.

The incoming electrical system should be checked for voltage stability, available short-circuit current, grounding arrangement, protection, disconnect requirements, and other installation-specific requirements before the drive is installed.

6.2 Input Phase

The input is:

Three Phase

Three-phase operation provides the electrical power required by the drive’s power-conversion section and is appropriate for industrial 50 HP motor installations.

6.3 Input Type

The 20P41AD086RA0NNN uses a:

6-Pulse Input

This is a common industrial power-conversion configuration for converting three-phase AC input power into controlled DC power.

6.4 Output Current

The rated DC output current is:

86 A

For a DC motor application, armature current is a particularly important selection parameter.

The drive should be selected based on the motor’s actual armature voltage and current requirements, operating duty, acceleration requirements, load inertia, and regenerative requirements.

6.5 Motor Power

The rated motor capacity is:

37 kW / 50 HP

This makes the model suitable for medium-power DC motors used in industrial production equipment.

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7. Four-Quadrant Operation

One of the most important characteristics of the 20P41AD086RA0NNN is its four-quadrant regenerative operation.

Four-quadrant operation allows the drive to control the motor in both directions and manage both motoring and regenerative braking conditions.

In practical terms, this means the motor can operate in:

• Forward motoring
• Forward regenerative braking
• Reverse motoring
• Reverse regenerative braking

This operating capability is valuable in machines where the motor must repeatedly accelerate, decelerate, reverse, or control an overhauling load.

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8. Regenerative Operation

The regenerative configuration is especially useful for applications with substantial mechanical energy during deceleration.

When a high-inertia machine is decelerated, the motor can temporarily operate as a generator.

The regenerative drive architecture is designed to manage this operating condition as part of the drive’s normal control strategy.

This can be advantageous for:

• Winding machines
• Unwinding machines
• Roll drives
• Drawing machines
• High-inertia equipment
• Reversing machinery
• Material handling equipment
• Printing equipment
• Paper processing equipment
• Tension-control systems
• Machines with frequent acceleration and deceleration

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9. Regulated Field Supply

The 20P41AD086RA0NNN provides a single-phase regulated field supply.

DC motor performance depends not only on armature control but also on the motor field.

Controlled field operation allows the drive to manage the motor field according to the application requirements.

This can be important for:

• Base-speed operation
• Extended-speed operation
• Field weakening
• Constant-power operation
• Speed regulation
• Torque control
• Controlled acceleration

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10. Overload Capability

The PowerFlex DC drive family provides substantial short-term overload capability.

The overload values are short-duration ratings and should not be treated as continuous operating currents.

Actual application sizing should consider the motor’s current, acceleration profile, duty cycle, ambient temperature, cabinet temperature, and load characteristics.

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11. Enclosure

The standard enclosure is:

IP20 / NEMA/UL Type Open

This type of construction is intended for installation within a suitable electrical cabinet or protected control enclosure.

The drive should not normally be treated as a standalone outdoor or washdown-rated device.

The cabinet should provide appropriate protection from:

• Water
• Condensation
• Excessive dust
• Conductive contamination
• Chemical contamination
• Mechanical impact
• Excessive temperature

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12. Conformal Coating

The standard configuration includes conformal coating.

This treatment provides additional protection to electronic assemblies and can be beneficial in industrial environments where humidity, dust, or other contaminants may be present.

Conformal coating does not eliminate the need for a properly designed enclosure.

Correct cabinet design, ventilation, grounding, environmental control, and maintenance remain important.

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13. Dimensions and Weight

The 20P41AD086RA0NNN uses Frame A construction.

The approximate physical size is:

267 × 359 × 287 mm

The approximate dimensions are:

• Height: 267 mm
• Width: 359 mm
• Depth: 287 mm

The approximate drive weight is:

11.5 kg

The approximate packaged weight is:

13.5 kg

The dimensions should be used as equipment planning values. The actual cabinet layout also needs additional space for incoming power cables, motor cables, field wiring, control wiring, airflow, service access, and other components.

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14. Main Product Advantages

14.1 50 HP / 37 kW Capacity

The 50 HP rating makes this model suitable for medium-power industrial DC motors.

It provides a useful capacity point between the 40 HP and 60 HP models in the same 380–480 V regenerative family.

14.2 86 A Armature Current

The 86 A rating provides substantial current capacity for industrial DC motor applications.

This is particularly important when the motor experiences high starting torque or temporary load peaks.

14.3 Four-Quadrant Control

Four-quadrant operation allows the drive to control both motor direction and regenerative braking.

This is a significant advantage for reversible machinery and high-inertia equipment.

14.4 Regenerative Braking

The regenerative architecture is useful where mechanical energy must be controlled during deceleration.

It is particularly relevant to applications with frequent stopping, reversing, or overhauling loads.

14.5 Regulated Field Control

The integrated regulated field supply provides controlled operation of the DC motor field.

This can support more flexible speed-control strategies than a basic armature-only controller.

14.6 Conformal-Coated Electronics

The conformal-coated construction provides additional protection for electronic components in demanding industrial environments.

14.7 Compact Frame A Construction

For its 50 HP capacity, the Frame A package provides a relatively compact installation footprint.

This can be helpful when upgrading older equipment where cabinet space is limited.

14.8 Suitable for Existing DC Motor Systems

A major practical advantage of this type of drive is that it can be used in applications where the existing DC motor and mechanical equipment are still suitable.

This can reduce the scope of a modernization project compared with replacing the complete motor and mechanical transmission system.

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15. Typical Applications

Winding Machinery

The drive can be used for winding applications requiring controlled motor speed and regenerative operation.

Winding systems often experience changing mechanical conditions as the roll diameter changes.

Controlled speed and torque are therefore important.

Unwinding Machinery

Unwinding equipment can generate regenerative energy because the motor may need to provide controlled tension while the material is being pulled from a roll.

Four-quadrant operation can be useful for these operating conditions.

Paper Processing

DC drives have historically been used extensively in paper-processing machinery.

Potential applications include:

• Roll drives
• Rewinders
• Unwinders
• Coaters
• Calenders
• Slitters
• Web-handling systems

Printing Machinery

Printing equipment can require stable and repeatable motor speed.

The drive can be used for applications such as:

• Web handling
• Roll drives
• Rewind systems
• Unwind systems
• Printing line equipment

Metal Processing

The drive can be applied to industrial metal-processing equipment where DC motors remain in service.

Potential applications include:

• Drawing machines
• Roll drives
• Processing lines
• Coil handling
• Tension systems

High-Inertia Machinery

Machines with large rotating masses can require considerable braking torque during deceleration.

The regenerative architecture of the 20P41AD086RA0NNN is well suited to this type of operating profile.

Reversible Machinery

Machines that repeatedly change direction can benefit from four-quadrant operation.

Typical examples include certain roll-processing and material-processing machines.

DC Motor Retrofit Projects

The model is also relevant to modernization projects where an older DC controller needs to be replaced while the existing DC motor and mechanical system remain in service.

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16. Application Comparison

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17. Five Recommended Same-Series Models

The following models are closely related members of the PowerFlex DC Series 20P, using the same 380–480 V three-phase regenerative family.

These models provide a convenient comparison range around the 50 HP / 86 A reference model.

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18. Same-Series Model Comparison

The 73 A model is the lower-capacity neighbor commonly associated with a 40 HP motor.

The 100 A model is the next larger capacity point commonly associated with a 60 HP motor.

The 86 A version therefore occupies the 50 HP / 37 kW position between these two ratings.

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19. Five Same-Brand Related Models

Below are five other commonly encountered Allen-Bradley PowerFlex models that can be useful when comparing DC and AC drive requirements.

These are related products rather than direct replacements for the 20P41AD086RA0NNN because the 20P is a DC drive while these models are primarily intended for AC motor control.

The five models above cover several different PowerFlex product categories, from compact drives through higher-performance industrial AC drives.

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20. PowerFlex DC and AC Drive Difference

The most important difference when comparing the 20P41AD086RA0NNN with other PowerFlex products is the motor technology.

This distinction should be considered before choosing a replacement model.

A DC motor installation should not automatically be replaced with an AC drive simply because both products are described as motor drives.

The motor type, mechanical arrangement, feedback system, field circuit, load characteristics, and control requirements must all be evaluated.

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21. Dimensions and Weight Comparison

Physical dimensions can become especially important when replacing an older drive inside an existing cabinet.

For the 20P41AD086RA0NNN specifically, the approximately 11.5 kg drive weight should be considered when designing the mounting panel or replacing an older drive.

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22. Cabinet Installation Requirements

The 20P41AD086RA0NNN is normally installed inside a control cabinet because of its IP20 / NEMA/UL Type Open construction.

The cabinet should provide enough room for:

• Drive mounting
• Incoming AC wiring
• Motor armature wiring
• Field wiring
• Control wiring
• Feedback wiring
• Grounding
• Air circulation
• Heat dissipation
• Service access
• Component separation
• Cable bending radius

The drive should generally be installed vertically.

Adequate clearance around the equipment is important because the drive generates heat during normal operation.

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23. Thermal Management

A 37 kW / 50 HP drive can generate a significant amount of heat during continuous operation.

Cabinet thermal design should therefore consider:

• Ambient temperature
• Drive losses
• Motor loading
• Duty cycle
• Acceleration frequency
• Regenerative operation
• Cabinet size
• Internal airflow
• Nearby heat-producing equipment
• Cooling system capacity

If several drives are installed in the same enclosure, their combined heat generation must be considered rather than treating each drive independently.

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24. Feedback and Speed Regulation

The PowerFlex DC architecture supports feedback-based control arrangements.

Depending on the application, feedback may include a:

• DC tachometer
• Encoder

Feedback can improve speed regulation when the motor load changes significantly.

This can be useful for applications such as:

• Winding
• Unwinding
• Printing
• Paper processing
• Drawing
• Roll control
• Tension control
• High-precision speed regulation

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25. Model Selection Around 50 HP

For a 50 HP DC motor, the three most relevant capacity points in the same family can be compared as follows:

This comparison is useful when evaluating whether an existing drive is undersized, appropriately sized, or oversized for a particular DC motor.

However, final drive selection should be based on the actual motor nameplate and operating conditions rather than horsepower alone.

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26. Typical Motor Parameters to Check

Before replacing an existing DC drive with the 20P41AD086RA0NNN, the following motor information should be recorded.

This information is particularly important for retrofit projects.

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27. Product Advantages Summary

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28. Detailed Application Advantages

Winding and Unwinding

The combination of regenerative operation and speed regulation is particularly useful for roll-based applications.

The drive can manage acceleration, deceleration, and controlled braking while maintaining the required motor operating conditions.

High-Inertia Equipment

Large rotating masses can require considerable torque during acceleration and braking.

The 86 A drive rating combined with regenerative operation provides a suitable platform for these types of applications when the motor and load characteristics are properly matched.

Reversible Machinery

Machines that frequently reverse direction can benefit from four-quadrant control.

This reduces the need to treat reversing and braking as separate external functions.

Industrial Retrofit

For an existing DC motor installation, retaining the motor while replacing the drive can sometimes reduce mechanical modifications.

The 20P family is specifically suited to this type of DC control architecture.

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29. Five Same-Series Models – Expanded Reference Table

These models are useful when building a product range around the 20P41AD086RA0NNN.

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30. Recommended Related Product Range

For an industrial equipment supplier or maintenance department, a practical group of related 20P models can be organized around motor capacity.

This provides a clear progression of drive capacity for different DC motor sizes.

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31. Important Installation Considerations

The drive should be installed by personnel familiar with industrial electrical equipment and DC motor control systems.

Particular attention should be given to:

• AC input protection
• Motor armature wiring
• Field wiring
• Feedback wiring
• Grounding
• Control signal wiring
• Cabinet ventilation
• Heat dissipation
• Motor nameplate settings
• Acceleration and deceleration settings
• Regenerative operating conditions
• Emergency stop arrangements
• Maintenance isolation

The electrical installation should be designed around the complete machine rather than the drive alone.

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32. Overall Product Characteristics

The 20P41AD086RA0NNN can be summarized as a medium-power industrial regenerative DC drive with the following core characteristics:

50 HP

37 kW

86 A DC output

460 V AC nominal input

380–480 V AC class

Three-phase input

6-pulse input

Four-quadrant regenerative operation

Single-phase regulated field supply

IP20 / NEMA/UL Type Open

Conformal-coated electronics

Frame A

Approx. 11.5 kg drive weight

Approx. 267 × 359 × 287 mm physical size

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33. Final Product Summary

The Allen-Bradley 20P41AD086RA0NNN is a PowerFlex DC Series 20P regenerative digital DC drive designed for industrial applications requiring controlled operation of a 50 HP / 37 kW DC motor.

Its 86 A output-current rating makes it suitable for medium-power DC motor systems, while its four-quadrant regenerative architecture provides the operating capability required by machinery with frequent acceleration, deceleration, reversing, braking, or overhauling loads.

The regulated field supply provides an additional level of control over the DC motor field, while the digital drive architecture supports precise motor control functions.

The IP20 / NEMA/UL Type Open enclosure, conformal coating, and Frame A construction make the product suitable for installation inside industrial control cabinets.

For physical planning, the drive is approximately 267 × 359 × 287 mm and weighs approximately 11.5 kg, with an approximate packaged weight of 13.5 kg.

The closest same-series capacity options include the 20P41AD073RA0NNN, 20P41AD100RA0NNN, and other 20P regenerative models covering a broad range of DC motor ratings.

The five related same-brand models listed above provide alternatives for applications where an AC motor drive is required rather than a DC motor drive.

For an existing 50 HP DC motor system, the most important selection points remain the motor’s armature voltage, armature current, field voltage, field current, base speed, maximum speed, feedback method, load inertia, acceleration/deceleration requirements, and regenerative duty. These parameters determine whether the 20P41AD086RA0NNN is properly matched to the complete machine.