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Allen-Bradley 20P41AD035RA0NNN PowerFlex DC Drive — Detailed Product Specifications, Applications and Related Models

The 20P41AD035RA0NNN is a 20 HP / 15 kW regenerative DC drive in the PowerFlex DC family. It is designed for industrial DC motor applications that require controlled speed, torque, acceleration, deceleration, reversing and regenerative braking.

This model has a 35 A armature-current rating, a 460 V AC nominal three-phase input, a six-pulse input configuration, and four-quadrant regenerative operation. It is supplied in an IP20 / NEMA/UL Type Open enclosure with conformal-coated electronics, no HIM, and no communication module.

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1. Brand, Product Family and Series

The model designation itself reflects the general configuration of the drive. The 20P identifies the PowerFlex DC family, while the 35 portion corresponds to the 35 A drive rating for this voltage class.

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2. Complete Technical Parameter Table

The physical dimensions are approximately 359 × 267 × 287 mm, while the product weight is approximately 11.3–11.5 kg, depending on how the product and packaging configuration are specified.

For cabinet design, the drive body dimensions should not be treated as the total required installation space. Additional clearance is needed for wiring, ventilation, grounding and maintenance access.

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3. Product Introduction

The 20P41AD035RA0NNN is a medium-power industrial DC drive designed for controlling DC motors in demanding machinery.

With a 15 kW / 20 HP rating and a 35 A armature-current capacity, it is suitable for DC motors that require considerably more power than the smaller 10 HP and 15 HP configurations in the same family.

The drive is designed around a regenerative, four-quadrant architecture.

That means it can control the motor in forward and reverse directions and can also manage regenerative operation during deceleration or when the mechanical load drives the motor.

This makes the drive particularly useful for machinery where the motor is not simply running at one constant speed.

Applications involving frequent acceleration, braking, reversing, high inertia or tension control can take advantage of this type of DC-drive architecture.

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4. Main Electrical Characteristics

The primary electrical rating of the 20P41AD035RA0NNN is:

460 V AC, 3-phase input / 35 A armature output / 15 kW / 20 HP.

The 35 A armature rating is the most important electrical value when matching the drive with an existing motor.

A motor rated at 20 HP does not automatically mean that every 20 HP motor can use the same drive. Motor armature voltage, rated armature current, field voltage and field current must also be considered.

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5. Four-Quadrant Operation

The four-quadrant architecture is one of the most important features of the 20P41AD035RA0NNN.

A four-quadrant drive can operate the motor in both directions and can control both motoring and regenerative conditions.

This arrangement is particularly useful for machines that have to repeatedly accelerate and decelerate.

It is also useful for equipment that changes direction.

For example, a machine may accelerate a large roller in the forward direction, operate at a controlled speed, decelerate, stop, and then accelerate in reverse.

The drive is designed to handle these operating conditions through its regenerative four-quadrant configuration.

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6. Regenerative Braking

Regenerative operation becomes especially important when the mechanical load has substantial inertia.

A large reel, roller or drum stores mechanical energy while it is rotating.

When the machine decelerates, that stored energy has to go somewhere.

With a regenerative DC drive, the motor can operate as a generator during braking, allowing the drive system to control the regenerative energy.

This is useful for:

• Winders
• Unwinders
• Large rollers
• Paper machinery
• Printing machinery
• Metal-processing lines
• Drawing machines
• Reels
• Drums
• High-inertia conveyors
• Reversing equipment
• Material-handling machinery

For a machine with frequent braking cycles, regenerative operation can be an important part of the overall machine-control design.

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7. Armature Current Control

The 35 A armature-current rating is a major characteristic of this model.

In a DC motor, armature current is closely related to torque production.

During acceleration or heavy-load operation, the motor may require considerably more current than it uses during normal steady-state running.

The drive provides short-duration overload capability to accommodate temporary increases in load.

The overload figures are short-duration values.

They should not be interpreted as continuous current ratings.

The actual allowable operating current depends on the application, motor characteristics, ambient conditions, duty cycle and drive configuration.

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8. Field Supply

The drive includes a regulated field supply for the DC motor.

The field circuit plays an important role in DC motor operation because the motor field influences torque and speed characteristics.

Field control can be important for applications requiring:

• Stable motor operation
• Controlled field excitation
• Extended speed range
• Field weakening
• High-speed operation
• Controlled torque
• Stable speed regulation

The 20P41AD035RA0NNN uses a regulated single-phase field configuration in the approximately 10 A field-current class.

The actual motor field nameplate should always be compared with the drive’s field rating before installation.

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9. Speed Regulation

Speed control is another important reason to use a dedicated DC drive.

Depending on the system design, the PowerFlex DC platform can work with different speed-feedback arrangements.

Typical feedback methods include:

• Armature voltage feedback
• DC tachometer feedback
• Encoder feedback

A simple machine may use armature feedback.

A more demanding application may require a tachometer or encoder for improved speed regulation.

This can be useful for:

• Winding
• Unwinding
• Paper processing
• Printing
• Web handling
• Metal processing
• Drawing machines
• Roll drives
• Material handling
• Production lines requiring stable line speed

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10. Product Applications

10.1 Winding Machines

The 20P41AD035RA0NNN is well suited to winding applications where the motor must control a reel or roll.

The motor may experience different load conditions throughout the winding cycle.

The drive can be used for:

• Starting
• Acceleration
• Constant-speed operation
• Controlled deceleration
• Regenerative braking
• Reversing

The regenerative function is particularly useful when a large roll needs to be slowed down.

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10.2 Unwinding Machines

Unwinding machines can present a different type of mechanical load because the material being unwound can drive the rotating equipment.

The drive therefore needs to handle both motoring and regenerative conditions.

The four-quadrant architecture provides the required flexibility.

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10.3 Paper Processing

Paper-processing machinery often requires stable speed and controlled tension.

Potential applications include:

• Paper rolls
• Winders
• Unwinders
• Roll drives
• Web-handling equipment
• Converting machines
• Slitting equipment
• Finishing machinery

A stable motor speed can help maintain consistent material movement through the production line.

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10.4 Printing Machinery

Printing and converting machinery can require precise control of rollers and web-handling systems.

The drive can be used where controlled speed, acceleration and braking are important.

Typical applications include:

• Printing rollers
• Web drives
• Rewinders
• Unwinders
• Slitting equipment
• Converting equipment
• Material-feeding systems

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10.5 Metal Processing

DC drives have traditionally been used in many metal-processing applications.

Potential uses include:

• Rolling machinery
• Strip processing
• Coil handling
• Drawing machines
• Tension-control systems
• Finishing equipment

These applications may require high torque, controlled speed and regenerative braking.

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10.6 Extrusion

The drive can also be used in certain extrusion systems where a DC motor provides the required mechanical characteristics.

Possible applications include:

• Plastic extrusion
• Rubber processing
• Screw drives
• Material feeding
• Process machinery

The actual suitability depends on the motor rating and mechanical load.

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10.7 Conveyors

The 20P41AD035RA0NNN can be considered for industrial conveyors that use DC motors.

It is particularly useful where the conveyor has:

• High inertia
• Heavy loads
• Frequent starts and stops
• Controlled acceleration requirements
• Controlled deceleration requirements
• Reversing requirements

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10.8 Drawing Machines

Drawing machines can require stable motor speed and controlled torque.

A regenerative DC drive can be useful when the machine repeatedly changes speed or experiences significant mechanical loading.

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10.9 High-Inertia Machinery

High-inertia applications are another important area for regenerative DC drives.

Typical loads include:

• Large drums
• Reels
• Rollers
• Flywheels
• Heavy rotating equipment

The drive can control the motor during both acceleration and deceleration.

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11. Product Advantages

11.1 20 HP / 15 kW Power Rating

The 20 HP / 15 kW rating gives this model more capacity than the 15 HP / 27 A configuration.

It is a useful choice for larger DC motors within the same 460 V AC class.

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11.2 35 A Armature Capacity

The 35 A armature rating provides a clear electrical selection point.

When replacing an existing drive, the motor’s actual armature current should be compared against the 35 A drive rating.

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11.3 Regenerative Four-Quadrant Operation

The drive can operate in all four motor-control quadrants.

This is particularly useful for:

• Reversing machines
• High-inertia machines
• Winding equipment
• Unwinding equipment
• Braking-intensive applications

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11.4 Controlled Regenerative Braking

Regenerative braking allows the motor to be controlled electrically during deceleration.

This can reduce dependence on mechanical braking for normal operating cycles.

The final braking arrangement still depends on the machine safety design.

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11.5 Regulated Field Supply

The integrated regulated field supply simplifies the drive arrangement for compatible DC motors.

It allows the field circuit to be controlled as part of the overall DC motor-control system.

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11.6 Speed Feedback Capability

The drive platform supports feedback configurations that can improve speed regulation.

This is particularly valuable in processes where motor speed directly affects product quality.

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11.7 Short-Term Overload Capability

The drive can handle short-duration increases in current.

This can be useful during:

• Acceleration
• Heavy starting loads
• Temporary torque peaks
• Rapid load changes
• Certain braking conditions

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11.8 Conformal-Coated Electronics

The specified model includes conformal coating.

This provides additional protection for electronic components in industrial environments.

It does not change the IP20 enclosure classification, so the drive should still be installed in a suitable cabinet.

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12. Physical Dimensions and Weight

The approximately 359 × 267 × 287 mm dimensions make the model relatively compact for a 20 HP regenerative DC drive.

When designing the cabinet, additional clearance should be provided around the drive.

The physical envelope needs to accommodate:

• Power wiring
• Motor cables
• Field wiring
• Control wiring
• Feedback cables
• Ventilation
• Grounding
• Maintenance access

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13. Installation Environment

The IP20 enclosure means that the drive is intended for installation in a protected electrical environment.

It should not be treated as a weatherproof or water-resistant device.

A suitable cabinet should protect the drive from:

• Water
• Condensation
• Excessive dust
• Conductive particles
• Oil
• Corrosive substances
• Other contaminants

The cabinet should also provide appropriate ventilation.

Temperature management is important because excessive heat can shorten the service life of electronic components.

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14. Control and Feedback

The drive can be integrated into a machine-control system through its available control inputs and outputs.

Typical control functions can include:

• Start
• Stop
• Forward
• Reverse
• Speed reference
• Current reference
• Fault reset
• External interlock
• Drive ready
• Drive running
• Fault indication
• Analog signals

The standard configuration of the 20P41AD035RA0NNN does not include a HIM and does not include a communication module.

This is worth checking when planning a replacement because the existing machine may use an operator interface or network connection that needs to be recreated through the control architecture.

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15. Five Same-Series Recommended Models

The following models are closely related to the 20P41AD035RA0NNN and belong to the same general PowerFlex 20P regenerative DC-drive range.

These models form a useful progression around the 20 HP rating.

The 19 A and 27 A models are lower-power options, while the 45 A and 52 A models provide additional current capacity for larger DC motors.

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16. Five More Related 20P Models

The smaller models are useful for lower-power DC motors, while the 40 HP configuration is intended for a considerably larger motor.

The exact physical dimensions and weight should be treated as frame-dependent for the larger configurations.

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17. Five Related Models from the Same Brand

The following products are from the same brand but belong to other PowerFlex series.

They are primarily AC-drive products and therefore are related alternatives for applications where an AC motor is being considered.

These models are useful for comparison, but they are not direct electrical substitutes for the 20P41AD035RA0NNN.

The 20P series is designed around DC motor armature and field control, while the other models are primarily intended for AC motors.

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18. PowerFlex 525 — 25B-D4P0N104

This is a compact AC drive and is much smaller than the 20P41AD035RA0NNN.

It is intended for AC motor applications rather than DC motor armature and field control.

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19. PowerFlex 4M — 22F-D2P5N103

This model is intended for smaller AC motor applications.

Its power rating is substantially lower than the 15 kW capacity of the 20P41AD035RA0NNN.

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20. PowerFlex 753 — 20F1ANF1P7AA0NNNNN

The PowerFlex 753 family is designed for industrial AC motor control.

It can be relevant when an older DC system is being redesigned around an AC motor and AC drive.

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21. PowerFlex 755 — 20G11NC022JA0NNNNN

This is a higher-performance AC-drive platform.

For a machine conversion from DC to AC, a product in this family may be considered, but the motor and complete machine-control system would need to be evaluated together.

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22. PowerFlex 755 — 20G11GD011JA0NNNNN

This product belongs to the broader PowerFlex family but uses AC motor-control technology.

It should not be considered a direct replacement for a 20P DC drive without a complete motor and machine-system redesign.

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23. Comparison of the Main 20P Models

This group shows the progression around the 20 HP size.

The 20P41AD035RA0NNN is the 35 A / 20 HP / 15 kW configuration in this group.

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24. 20P41AD035RA0NNN vs. 20P41AD027RA0NNN

The two models are closely related and use the same general voltage class and drive architecture.

The principal difference is the higher power and current capacity of the 20P41AD035RA0NNN.

The 27 A version is rated for 15 HP, while the 35 A version is rated for 20 HP.

For an actual replacement, the motor nameplate current should be checked rather than selecting a drive based solely on horsepower.

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25. Product Selection Checklist

Before using the 20P41AD035RA0NNN as a replacement or new installation, the following items should be checked.

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26. Typical Industrial Applications

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27. Key Advantages Summary

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28. Final Product Summary

The Allen-Bradley 20P41AD035RA0NNN is a PowerFlex DC 20P Series regenerative digital DC drive with a 15 kW / 20 HP power rating and a 35 A armature-current rating.

Its nominal input is 460 V AC, three-phase, with a 380–480 V AC class input and a six-pulse configuration.

The drive is designed for four-quadrant operation, allowing both forward and reverse motor operation as well as regenerative braking.

The model includes a regulated field supply and is intended for industrial DC motor systems where controlled speed, torque, acceleration, deceleration and braking are important.

The standard configuration uses an IP20 / NEMA/UL Type Open enclosure, Frame A construction, conformal-coated electronics, a blank front plate without HIM, and no communication module.

The approximate physical dimensions are:

359 mm H × 267 mm W × 287 mm D

The approximate product weight is:

11.3–11.5 kg

The model is suitable for applications such as winding machines, unwinding machines, paper processing, printing and converting, metal processing, extrusion, drawing machines, conveyors, roll drives, reels, drums and other high-inertia industrial machinery.

The closest related models include 20P41AD019RA0NNN, 20P41AD027RA0NNN, 20P41AD045RA0NNN and 20P41AD052RA0NNN.

The smaller 20P41AD019RA0NNN and 20P41AD027RA0NNN provide lower current and power ratings, while the 20P41AD045RA0NNN and 20P41AD052RA0NNN provide higher current capacity.

For broader AC-drive applications, related products include the 25B-D4P0N104, 22F-D2P5N103, 20F1ANF1P7AA0NNNNN, 20G11NC022JA0NNNNN and 20G11GD011JA0NNNNN.

The most important selection parameters for the 20P41AD035RA0NNN are the motor’s armature voltage, armature current, field voltage, field current, horsepower, rated speed, maximum speed, feedback method, regenerative requirements and machine duty cycle.

For an existing 20 HP DC motor, the 35 A armature rating is particularly important. The drive should be selected based on the actual motor nameplate and machine operating requirements rather than horsepower alone.

The combination of 15 kW capacity, 35 A armature current, regulated field control, four-quadrant operation and regenerative capability makes the 20P41AD035RA0NNN a suitable configuration for medium-power industrial DC motor-control systems where controlled speed, torque, reversing and braking are required.