Company Information
E-mail		[email protected]
Mobile		+8615980777398
Whatsapp		+8615980777398
WeChat		15980777398

Allen-Bradley 20P41AD027RA0NNN PowerFlex DC Drive — Detailed Product Information

1. Product Overview

The Allen-Bradley 20P41AD027RA0NNN is a PowerFlex DC drive designed for industrial DC motor control. It is a 15 HP / 11 kW regenerative digital DC drive with a 27 A armature current rating and a nominal 460 V AC three-phase input.

This model belongs to the PowerFlex DC, 20P Series and is intended for industrial machinery where accurate DC motor speed and torque control, reversing, acceleration, deceleration, and regenerative braking are required.

The 20P41AD027RA0NNN is particularly suitable for applications that already use DC motors and require a modern digital drive platform without changing the complete motor and mechanical system.

---

2. Brand and Series

---

3. Detailed Technical Specifications

Note: Dimensions and weight are approximate values for the stated configuration. Actual installation drawings and the exact hardware revision should be checked when cabinet space or replacement fit is critical.

---

4. Electrical Characteristics

The 20P41AD027RA0NNN is rated at 27 A armature current and 11 kW / 15 HP.

The 460 V AC input class makes it suitable for industrial power systems in the 380–480 V AC range.

The three-phase, six-pulse input arrangement is a conventional industrial DC-drive configuration.

The 27 A armature rating is one of the most important specifications when matching the drive with a DC motor.

For a replacement application, the motor nameplate armature current should be checked first. The motor’s armature voltage and field requirements should also be checked before selecting the drive.

---

5. Four-Quadrant Operation

Four-quadrant operation is a major feature of this drive.

A conventional motor drive may primarily operate the motor in one direction, while a four-quadrant drive can control both motor and regenerative conditions in forward and reverse directions.

This operating method is useful when the machine needs frequent acceleration, deceleration, stopping, or reversing.

It is particularly useful for machinery where the motor can be driven by the mechanical load during deceleration.

---

6. Regenerative Capability

The 20P41AD027RA0NNN is a regenerative configuration.

Regenerative operation is useful when a machine has significant mechanical inertia.

For example, a large roller, reel, drum, or other rotating component stores energy while running. When the machine needs to slow down, this energy has to be controlled.

Instead of depending entirely on mechanical friction brakes, the DC drive can control the motor electrically during regeneration.

Typical regenerative applications include:

• Winding machines
• Unwinding machines
• Paper machinery
• Printing equipment
• Metal-processing equipment
• Drawing machines
• Large rollers
• Reels and drums
• High-inertia conveyors
• Reversing machinery
• Process machinery with frequent braking

This is one of the main reasons to select a regenerative DC drive instead of a simple non-regenerative configuration.

---

7. DC Motor Control

The 20P41AD027RA0NNN is specifically intended for DC motor applications.

A DC motor system generally requires control of the armature and field.

The drive can regulate the armature circuit to control motor speed and torque while also managing the field circuit.

This makes the drive suitable for machinery where DC motor characteristics are already integrated into the mechanical process.

Typical control requirements include:

• Motor starting
• Acceleration
• Constant-speed operation
• Deceleration
• Regenerative braking
• Forward operation
• Reverse operation
• Torque control
• Speed control
• Field control
• Field weakening

The exact control method depends on the motor, feedback equipment, machine requirements, and drive configuration.

---

8. Speed Control

Speed regulation is an important part of the PowerFlex DC architecture.

Depending on the application, speed feedback can be implemented using:

• Armature voltage feedback
• DC tachometer feedback
• Encoder feedback

For a simple machine, armature feedback may be adequate.

For a machine where speed accuracy is more important, a tachometer or encoder feedback system can be used.

This is particularly useful for:

• Web handling
• Printing
• Winding
• Unwinding
• Paper processing
• Metal processing
• Roll-to-roll machinery
• Conveyor systems
• Drawing machines

Stable motor speed can help maintain consistent production speed and reduce process variation.

---

9. Armature Current and Torque Control

The 27 A armature-current rating provides a clear basis for motor selection.

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

When the machine requires more torque, the motor may draw more armature current.

During acceleration, for example, the drive can provide increased current within its operating and overload limits.

The drive is rated for approximately:

The 150% and 200% values are short-duration capabilities and should not be treated as continuous ratings.

The actual motor application should always be evaluated based on the motor nameplate, load characteristics, acceleration requirements, and duty cycle.

---

10. Field Supply

The drive includes a regulated field supply.

The field circuit is important in a DC motor because the motor field affects the motor’s torque and speed characteristics.

The field-control system can be used for applications involving:

• Normal field operation
• Controlled field excitation
• Field weakening
• Extended speed operation
• Speed-range control

The stated configuration is in the approximately 360 V DC / 10 A maximum field-output class.

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

---

11. Product Applications

11.1 Winding Machines

Winding machines are a typical type of application for regenerative DC drives.

The motor may need to accelerate a large roll, maintain a stable operating speed, and then decelerate the roll.

During deceleration, the mechanical energy stored in the roll can result in regenerative operation.

The four-quadrant characteristics of the drive are useful for these operating cycles.

---

11.2 Unwinding Machines

Unwinding equipment can place the motor in regenerative operating conditions.

The mechanical material being unwound can influence the motor load and create changing torque requirements.

The drive can provide controlled operation during acceleration, steady running and braking.

---

11.3 Paper and Web Processing

Paper-processing equipment often requires stable speed and controlled acceleration.

Applications can include:

• Paper rolls
• Winders
• Unwinders
• Roll drives
• Converting lines
• Web-handling systems
• Slitting equipment

Speed stability is particularly important because speed variation can affect web tension and finished-product quality.

---

11.4 Printing Machinery

Printing machinery may use DC motors for roller and web-handling functions.

The drive can provide controlled acceleration and deceleration while maintaining the required motor speed.

Potential applications include:

• Printing rollers
• Web drives
• Rewinders
• Unwinders
• Converting equipment
• Slitting equipment

---

11.5 Metal Processing

DC motor technology has been widely used in industrial metal-processing machinery.

Potential applications include:

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

These machines can require high torque, controlled speed, and regenerative braking.

---

11.6 Extrusion Machinery

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

Potential applications include:

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

The exact suitability depends on the motor rating and the mechanical load profile.

---

11.7 Conveyors and Material Handling

The drive can be applied to industrial conveyors and material-handling machinery.

This is particularly relevant where:

• The load has high inertia
• The conveyor requires controlled acceleration
• The conveyor requires controlled deceleration
• Reversing is required
• Regenerative braking is beneficial

---

11.8 Drawing Machines

Drawing machinery can require stable motor speed and controlled torque.

The drive can be used where the process involves continuous material movement and changing mechanical loads.

---

11.9 High-Inertia Machinery

High-inertia machines can benefit significantly from regenerative operation.

Examples include:

• Large drums
• Reels
• Rollers
• Flywheel-type machinery
• Heavy rotating assemblies

The drive provides electrical control of the motor during both acceleration and deceleration.

---

12. Main Product Advantages

12.1 15 HP / 11 kW Capacity

The 15 HP / 11 kW rating places the 20P41AD027RA0NNN in a useful medium-power range for industrial DC motor systems.

It is larger than the 10 HP / 19 A configuration while remaining part of the same general 20P family.

---

12.2 27 A Armature Current

The 27 A armature rating provides a straightforward selection reference.

When replacing another DC drive, comparing the existing motor’s armature current with the 27 A rating is one of the first checks to make.

---

12.3 Regenerative Four-Quadrant Operation

The regenerative four-quadrant configuration allows the drive to control forward and reverse motoring as well as regenerative braking.

This is particularly useful for machines with frequent direction changes or deceleration cycles.

---

12.4 Regulated Field Supply

The integrated regulated field supply allows the drive to manage the DC motor field.

This reduces the need for a separate field-control arrangement in applications that fit within the drive’s field ratings.

---

12.5 Speed Feedback Capability

The PowerFlex DC platform can accommodate different feedback arrangements.

Tachometer and encoder feedback can be useful when the application requires more precise speed regulation.

---

12.6 Overload Capability

The drive provides short-term overload capability.

Approximately 150% current for one minute and 200% current for three seconds can be useful for short periods of increased mechanical demand.

This can help during:

• Starting
• Acceleration
• Heavy-load conditions
• Short torque peaks
• Certain braking cycles

---

12.7 Conformal-Coated Electronics

The specified configuration includes conformal coating.

This provides an additional layer of protection for electronic assemblies.

It does not, however, make the drive suitable for direct outdoor or wet-environment installation.

The enclosure remains IP20 / NEMA/UL Type Open, so a suitable electrical cabinet or enclosure is required.

---

12.8 Compact Frame A Construction

The model uses a Frame A configuration.

The approximate dimensions are:

359 mm H × 267 mm W × 287 mm D

with an approximate weight of:

11.34 kg

This makes physical planning relatively straightforward for a cabinet-mounted installation.

---

13. Dimensions and Weight

The dimensions above describe the drive itself.

Additional cabinet space should be provided for power cables, control wiring, ventilation, grounding, maintenance access and safe cable routing.

---

14. Installation Considerations

Because the drive uses an IP20 / NEMA/UL Type Open enclosure, it should normally be installed inside a suitable electrical cabinet.

The installation environment should be protected against direct exposure to:

• Water
• Condensation
• Excessive dust
• Conductive particles
• Oil contamination
• Corrosive chemicals

Adequate ventilation is also important.

Power cables and low-level feedback cables should be routed carefully.

When an encoder or tachometer is used, proper cable shielding and grounding can help reduce electrical noise.

---

15. Control System Integration

The drive can be integrated into an industrial control system through its available control I/O.

Typical control signals may include:

• Run
• Stop
• Forward
• Reverse
• Speed reference
• Current reference
• Fault reset
• External interlock
• Drive ready
• Drive running
• Fault status
• Analog feedback

The exact I/O configuration depends on the application and installed options.

The stated model configuration does not include a communication module or HIM.

---

16. Five Same-Series or Closely Related Models

The following models are useful for comparing different power ratings within the same general 20P DC family.

*Dimensions and weight can vary by frame and exact configuration. These values should be treated as approximate when used for mechanical installation planning.

---

17. Additional Same-Series Models

These models provide a convenient progression of armature-current ratings.

The 20P41AD027RA0NNN sits between the 19 A and 35 A configurations, making the 27 A rating a useful choice for a motor requiring approximately 27 A or less, subject to the complete motor and application requirements.

---

18. Five Related Allen-Bradley Models

The following five models are from other PowerFlex series and are useful when comparing DC-drive technology with AC-drive technology.

They are related products rather than direct replacements.

These products are useful alternatives when the application is being redesigned around an AC motor.

They should not be considered direct electrical substitutes for the 20P41AD027RA0NNN.

---

19. PowerFlex 525 — 25B-D4P0N104

This is a compact AC drive and is considerably smaller than the 20P41AD027RA0NNN.

Its application is based on AC motor control rather than DC armature and field control.

---

20. PowerFlex 4M — 22F-D2P5N103

This model is intended for relatively small AC motor applications.

It is therefore much smaller in capacity than the 15 HP 20P41AD027RA0NNN.

---

21. PowerFlex 753 — 20F1ANF1P7AA0NNNNN

The PowerFlex 753 family is intended for industrial AC motor-control applications.

It is more relevant when an existing DC motor system is being redesigned or replaced with an AC motor and AC drive arrangement.

---

22. PowerFlex 755 — 20G11NC022JA0NNNNN

The PowerFlex 755 is intended for more advanced industrial AC motor applications.

It is not a direct replacement for the 20P41AD027RA0NNN because the 20P is designed around DC motor armature and field control.

---

23. PowerFlex 755 — 20G11GD011JA0NNNNN

This model belongs to the same broad PowerFlex product family but uses AC motor-control technology.

---

24. Direct Comparison with Related 20P Models

The progression from 10 A → 14 A → 19 A → 27 A → 35 A provides a practical way to compare the different drive sizes.

---

25. Product Selection Points

When choosing the 20P41AD027RA0NNN for an existing machine, the following items should be checked.

---

26. Why the 20P41AD027RA0NNN Is Suitable for Existing DC Systems

One of the practical advantages of this product is that it can be used in an existing DC motor installation without automatically requiring a complete change to AC motor technology.

For a machine that already has a suitable DC motor, the existing motor, mechanical transmission and production process can potentially remain in place while the drive-control system is modernized.

This can be useful for older industrial equipment where the motor itself is still mechanically sound but the original drive has become difficult to maintain or replace.

A retrofit still requires a complete engineering check.

The motor nameplate, field circuit, feedback device, braking arrangement, control signals, cabinet dimensions and machine safety system should all be checked before replacement.

---

27. Overall Product Advantages

---

28. Final Summary

The Allen-Bradley 20P41AD027RA0NNN is a PowerFlex DC 20P Series digital regenerative drive designed for 15 HP / 11 kW DC motor applications.

Its principal electrical rating is 27 A armature current, with a nominal 460 V AC three-phase input and a 380–480 V AC input class.

The drive uses a six-pulse input arrangement and supports four-quadrant regenerative operation, allowing forward motoring, forward regeneration, reverse motoring and reverse regeneration.

The regulated field supply is another important feature for DC motor applications, particularly where the machine requires controlled field operation or a wider speed range.

The standard configuration is an IP20 / NEMA/UL Type Open Frame A unit.

The approximate physical dimensions are:

359 mm × 267 mm × 287 mm

and the approximate weight is:

11.34 kg

The product is suitable for a wide range of industrial machinery, including winders, unwinders, conveyors, paper-processing equipment, printing machinery, metal-processing systems, extrusion equipment, drawing machines, roll drives and other high-inertia or reversing applications.

The closest related 20P models include the 20P41AD010RA0NNN, 20P41AD014RA0NNN, 20P41AD019RA0NNN and 20P41AD035RA0NNN.

For applications moving from DC motor technology to AC motor technology, related PowerFlex products include the PowerFlex 525, PowerFlex 753 and PowerFlex 755 families.

For a replacement project, the most important items to compare are the motor armature voltage, armature current, field voltage, field current, motor horsepower, motor speed, feedback type, regeneration requirements, acceleration/deceleration duty and available cabinet space.

The 27 A armature-current rating, 15 HP / 11 kW capacity, regulated field supply, and four-quadrant regenerative operation are the key characteristics that define the 20P41AD027RA0NNN and distinguish it from smaller non-regenerative or AC-drive products.