Introduction

The Allen Bradley 20P41AD035RA0NNN PowerFlex DC Drive is a regenerative DC motor-control solution designed for industrial applications that require more than basic speed regulation. Its combination of 460 V AC three-phase input, 35 A armature capacity, and 20 HP / 15 kW normal-duty rating makes it suitable for a wide range of medium-power DC motor systems.

One of the most important characteristics of this configuration is its regenerative capability. In applications where machinery frequently accelerates, decelerates, reverses, or operates against changing loads, braking performance can be just as important as motoring performance. A regenerative drive provides a controlled electrical approach to these operating conditions.

This is particularly valuable in web handling and winding equipment. Maintaining stable speed and tension requires the motor to respond quickly to changes in material movement. Similarly, rolling, converting, printing, and other continuous-process machinery can benefit from controlled DC motor response.

The PowerFlex DC platform also makes sense for long-running industrial equipment. Many legacy machines remain mechanically productive even though individual electrical components have reached the end of their service life. Replacing the drive while retaining the existing motor and machine structure can reduce the scope, cost, and disruption of a modernization project.

The 20P41AD035RA0NNN is configured as an IP20, NEMA/UL Type Open drive with conformal coating, a blank plate instead of a HIM, and no communication module. These characteristics should be considered when planning cabinet installation and system integration.

For maintenance engineers, troubleshooting remains important before replacement. A regenerative DC drive fault can originate from the motor, armature circuit, field circuit, feedback system, mechanical load, or control configuration. Checking these areas first can prevent unnecessary drive replacement.

When the drive itself has been confirmed as defective, preserving the original configuration is highly recommended. Motor data, current limits, speed references, acceleration and deceleration values, and other application settings can make commissioning the replacement considerably easier.

For industrial users maintaining established DC motor equipment, the 20P41AD035RA0NNN offers a practical combination of regenerative performance, industrial construction, and long-term maintenance value.

Technical Specifications

Specification	Details
Brand	Allen Bradley
Manufacturer	Rockwell Automation
Model	20P41AD035RA0NNN
Product Family	PowerFlex DC
Product Type	Regenerative DC Drive
Input Voltage	460 V AC
Input Phase	3-Phase
Input Type	6-Pulse
Normal-Duty Power	15 kW / 20 HP
Armature Current	35 A
Operation	Four-Quadrant / Regenerative
Field Current	10 A
Field Supply	Single-Phase Regulated
Frame Size	A
Enclosure	IP20 / NEMA/UL Type Open
Conformal Coating	Yes
HIM	No HIM / Blank Plate
Communication Module	None
Dimensions	359 × 267 × 287 mm
Length	359 mm
Width	267 mm
Depth	287 mm
Weight	11.50 kg (25.35 lb)
Installation	Industrial Drive Cabinet / Control System
Application Area	DC Motor Control and Industrial Process Automation

Weight: 11.50 kg (25.35 lb)

The dimensions and weight above are based on the product information supplied for this product page. Electrical configuration details should be matched with the target motor, cabinet, field circuit, and control architecture before installation.

Recommended Related Models

For PowerFlex DC replacement, maintenance, and system planning, the following models are closely related:

Allen Bradley 20P41AD027RA0NNN – PowerFlex DC Drive
Allen Bradley 20P41AD019RA0NNN – PowerFlex DC Drive
Allen Bradley 20P41AD014RA0NNN – PowerFlex DC Drive
Allen Bradley 20P41AB9P0RA0NNN – PowerFlex DC Drive
Allen Bradley 20P41AB7P0RA0NNN – PowerFlex DC Drive

These drives belong to the PowerFlex DC family, but voltage, current rating, regenerative capability, field configuration, and other electrical characteristics can differ. A related model should not be treated as a direct replacement without complete system verification.

Popular Related Models

For industrial customers maintaining Allen Bradley DC motor systems, the following models are also useful related references:

Allen Bradley 20P41AD035RA0NNN – PowerFlex DC Drive
Allen Bradley 20P41AD027RA0NNN – PowerFlex DC Drive
Allen Bradley 20P41AD019RA0NNN – PowerFlex DC Drive
Allen Bradley 20P41AD014RA0NNN – PowerFlex DC Drive
Allen Bradley 20P21AD035RA0NNN – PowerFlex DC Drive

When sourcing the Allen Bradley 20P41AD035RA0NNN PowerFlex DC Drive, always use the complete catalog number. The AD035 configuration identifies a specific 460 V, 35 A PowerFlex DC drive rating, while the remaining catalog characters define additional hardware and application characteristics. Accurate part-number matching is therefore essential for reliable replacement, commissioning, and long-term operation.

Applications

The Allen Bradley 20P41AD035RA0NNN PowerFlex DC Drive is a regenerative industrial DC drive designed for reliable control of DC motors in production and process equipment. With a 460 VAC three-phase input, 35 A armature output, and 20 HP / 15 kW normal-duty rating, this drive is well suited to applications where controlled speed, torque response, and regenerative operation are important.

Its four-quadrant operating capability makes it particularly useful for machinery that requires controlled acceleration, deceleration, reversing, or braking. Rather than treating braking energy as a purely mechanical problem, a regenerative DC drive can manage energy associated with deceleration within the drive system.

Typical applications include:

Web handling equipment
Winding and unwinding machines
Printing machinery
Converting equipment
Industrial conveyors
Material handling systems
Rolling and processing equipment
Tension-control systems
Continuous-process machinery
Legacy DC motor installations
Industrial retrofit projects
PowerFlex DC replacement applications

The 20P41AD035RA0NNN is especially attractive for facilities that need to maintain an existing DC motor system while improving drive reliability or replacing aging control hardware.

Advantages

Regenerative four-quadrant operation
The drive is designed for regenerative applications where controlled motoring and braking are required. This makes it a strong fit for machinery with frequent speed changes or reversing requirements.

460 VAC three-phase input
The drive is designed for a 460 V AC industrial power environment, making it suitable for compatible plant electrical systems.

35 A armature rating
Its 35 A armature capability provides a practical solution for medium-power DC motor applications.

20 HP / 15 kW capacity
The normal-duty rating allows the drive to support DC motor systems up to approximately 20 HP or 15 kW under the specified conditions.

Excellent for legacy DC equipment
For older machines that still use DC motors, replacing the drive can be much less disruptive than converting the motor, cabinet, feedback system, and machine controls to an entirely new AC architecture.

Conformal-coated electronics
The configured drive includes conformal coating, providing additional protection for internal electronic assemblies in suitable industrial environments.

Open industrial enclosure
The IP20 / NEMA/UL Type Open configuration is suitable for installation within an appropriately designed electrical cabinet or controlled equipment environment.

No communication module simplifies basic installations
This configuration is supplied without a communication module, making it appropriate for applications where communication networking is handled separately or is not required.

Practical maintenance value
For production facilities operating established PowerFlex DC equipment, maintaining the exact replacement catalog number can reduce downtime and simplify service planning.

Technical FAQs

1. What is the Allen Bradley 20P41AD035RA0NNN?
The 20P41AD035RA0NNN is an Allen Bradley PowerFlex DC Drive designed for regenerative control of industrial DC motors.

2. What are the main electrical ratings of this drive?
The drive is configured for 460 V AC input, three-phase operation, 35 A armature output, and 20 HP / 15 kW normal-duty capacity.

3. What does regenerative operation mean in a DC drive?
During controlled deceleration, the motor can operate as a generator. Regenerative drive technology manages this energy as part of the electrical drive system rather than relying solely on mechanical braking.

4. What is four-quadrant operation useful for?
Four-quadrant operation is useful when machinery needs controlled forward and reverse torque, acceleration and deceleration, or frequent regenerative braking.

5. What applications benefit most from regenerative DC control?
Web handling, winding, unwinding, converting, rolling, tension control, and other machinery with frequent speed changes or reversing can benefit from regenerative operation.

6. What can cause an armature overcurrent fault?
Potential causes include excessive mechanical loading, motor winding problems, short circuits, damaged armature cables, incorrect current settings, or overly aggressive acceleration.

7. Can a DC motor fault cause the drive to trip?
Yes. Brush and commutator problems, armature insulation faults, field-circuit problems, mechanical overload, and cable damage can all result in drive protective faults.

8. What should be checked if motor speed fluctuates?
Check speed-reference stability, drive parameters, armature connections, field supply, motor condition, feedback components where applicable, mechanical loading, and control wiring.

9. Does the 20P41AD035RA0NNN include a communication module?
This configuration is specified without a communication module. Any required network functionality should therefore be evaluated separately as part of the overall control architecture.

10. What should be verified before replacing the drive?
Confirm the exact catalog number, input voltage, armature current requirement, motor horsepower, field configuration, regenerative requirements, control connections, and existing parameter settings before installation.

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