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1. Product Overview

The Allen-Bradley 20P41AD167RA0NNN is a high-power PowerFlex DC Drive designed for industrial DC motor control applications. It is rated for a 480 VAC, three-phase input, 167 A output current, and a 100 HP / approximately 75 kW motor rating.

The drive uses a six-pulse input configuration and supports four-quadrant regenerative operation, making it suitable for machinery that requires controlled acceleration, deceleration, reversing, and regenerative braking.

The product is built in a Frame B configuration and uses an IP20, NEMA/UL Type Open enclosure with conformal coating. This configuration is supplied without a standard HIM operator interface and without a communication module.

The 20P41AD167RA0NNN is particularly relevant to large industrial machines that continue to use DC motors. It can also be used in modernization projects where an existing DC motor and mechanical transmission are retained while the drive-control system is upgraded.

The combination of relatively high output current, four-quadrant operation, feedback capability, flexible I/O, and DC motor compatibility makes this model suitable for demanding continuous-production machinery.

2. Brand and Product Series

Item	Description
Brand	Allen-Bradley
Product Family	PowerFlex
Product Series	PowerFlex DC
Product Type	Digital Regenerative DC Drive
Catalog Number	20P41AD167RA0NNN
Voltage Class	460/480 VAC
Rated Input	480 VAC, 3 Phase
Input Configuration	6 Pulse
Output Current	167 A
Motor Rating	100 HP
Motor Power	Approximately 75 kW
Motor Operation	Four-Quadrant Regenerative
Frame Size	Frame B
Enclosure	IP20, NEMA/UL Type Open
Conformal Coating	Yes
HIM	Blank Plate / No HIM
Communication Module	None Standard
Field Supply	Single-Phase Regulated
Feedback	DC Tachometer and Encoder Capability

The model belongs to the PowerFlex DC series. Within this product family, the 20P41 configuration represents the regenerative version of the drive family.

The 20P41AD167RA0NNN is therefore not simply a general-purpose motor controller. It is specifically intended for applications in which DC motor control and regenerative operation are important.

3. Main Technical Parameters

Parameter	Specification
Model / Catalog Number	20P41AD167RA0NNN
Brand	Allen-Bradley
Series	PowerFlex DC
Product Type	Regenerative Digital DC Drive
Input Voltage	480 VAC
Input Voltage Class	460/480 VAC
Input Phase	3 Phase
Input Type	6 Pulse
Rated Output Current	167 A
Motor Rating	100 HP
Motor Rating	Approximately 75 kW
Operation	Four-Quadrant Regenerative
Field Supply	Single-Phase Regulated
Frame Size	B
Enclosure Rating	IP20
Enclosure Type	NEMA/UL Type Open
Conformal Coating	Yes
HIM	No HIM / Blank Plate
Communication Module	None Standard
Feedback	DC Tachometer / Encoder
Digital I/O Capability	Up to 12 digital inputs and outputs
Analog Inputs	Up to 3
Analog Outputs	Up to 4
Approx. Dimensions H × W × D	311 × 388 × 350 mm
Approx. Weight	25.5 kg
Mounting	Surface / Panel Mount
Intended Motor	Industrial DC Motor
Typical Motor Class	100 HP / 75 kW

The 167 A output rating is the central electrical characteristic of this model. In the 460/480 V regenerative PowerFlex DC range, the 167 A model corresponds to the 100 HP / 75 kW class and uses Frame B construction.

The physical size is approximately 311 × 388 × 350 mm, with an approximate weight of 25.5 kg. These values should be considered installation-planning values; final cabinet construction should use the mechanical information applicable to the exact installation configuration.

4. Electrical Characteristics

4.1 Input Power

The 20P41AD167RA0NNN is designed for a 480 VAC three-phase industrial power supply.

The three-phase input arrangement is suitable for industrial power distribution systems and is consistent with the requirements of high-power DC motor applications.

The drive uses a 6-pulse input configuration. This is a conventional configuration for industrial DC drive systems and provides the rectified DC power required for armature control.

4.2 Output Current

The rated output current is:

167 A

This rating is important when matching the drive to a DC motor.

The drive should be selected according to the actual motor armature current and operating duty rather than relying solely on the motor horsepower.

For a 100 HP-class DC motor, the 167 A drive provides the appropriate current class within the PowerFlex DC range.

4.3 Motor Power

The nominal motor rating is:

100 HP / approximately 75 kW

This places the 20P41AD167RA0NNN in the higher-power industrial DC drive category.

It is intended for substantial production machinery rather than small auxiliary motor applications.

5. Four-Quadrant Regenerative Operation

Four-quadrant operation is one of the most important characteristics of the 20P41AD167RA0NNN.

A four-quadrant drive can control both motor speed and torque in both rotational directions.

In practical operation, the four operating conditions can be described as:

Quadrant	Motor Condition	Typical Function
Quadrant I	Forward Motoring	Accelerating or running forward
Quadrant II	Forward Regeneration	Controlled braking while moving forward
Quadrant III	Reverse Motoring	Accelerating or running in reverse
Quadrant IV	Reverse Regeneration	Controlled braking while moving in reverse

This capability is especially useful for machines that repeatedly accelerate and decelerate.

Examples include:

• Winding machines
• Unwinding machines
• Reversing systems
• High-inertia equipment
• Metal-processing machinery
• Material-handling systems
• Test machinery
• Large rotating equipment

6. Regenerative Braking

During deceleration, a motor can act as a generator.

This is particularly important when the driven machine contains a large amount of rotating or moving mass.

Instead of treating braking as a simple stop command, the drive can actively control the transition from motoring to regenerative operation.

This provides better control of the machine during deceleration and is particularly useful where braking occurs frequently.

Applications with repeated braking cycles can therefore benefit substantially from regenerative drive architecture.

7. Product Construction

The 20P41AD167RA0NNN uses an:

IP20, NEMA/UL Type Open enclosure

This enclosure classification means the drive is generally intended to be installed inside a suitable electrical cabinet or protected control enclosure.

It should not be treated as a standalone outdoor or washdown enclosure.

The drive also uses conformal coating.

Conformal coating provides additional protection to electronic circuitry against certain environmental influences. It can be useful in industrial environments where humidity, dust, and atmospheric contamination may place additional stress on electronic components.

However, conformal coating does not eliminate the need for proper cabinet design.

8. Physical Dimensions and Weight

Physical Parameter	Specification
Model	20P41AD167RA0NNN
Frame	B
Height	Approximately 311 mm
Width	Approximately 388 mm
Depth	Approximately 350 mm
Overall Dimensions	Approx. 311 × 388 × 350 mm
Approx. Weight	25.5 kg
Installation Type	Panel / Surface Mount
Enclosure	IP20
Cabinet Installation	Recommended

The approximately 25.5 kg weight should be taken into account when designing the mounting plate.

The cabinet should also provide enough space for incoming power wiring, motor wiring, field connections, feedback cables, control wiring, grounding conductors, ventilation, and maintenance access.

The actual clearance requirements should always be checked against the mechanical installation information for the exact drive configuration.

9. Feedback Capability

The PowerFlex DC platform provides built-in support for motor feedback.

The 20P41AD167RA0NNN can be used with:

• DC tachometer feedback
• Encoder feedback

Feedback becomes especially important when the machine requires accurate speed regulation.

For example, in a winding machine, simply commanding a motor to operate at a particular speed may not be enough. Actual motor speed may need to be measured continuously and compared with the commanded value.

The drive can then adjust its control output to maintain the required operating condition.

This type of closed-loop control is useful for:

• Winding
• Unwinding
• Wire drawing
• Printing
• Converting
• Extrusion
• Tension control
• Precision speed regulation

10. I/O Capability

The drive provides substantial I/O flexibility.

I/O Category	Capability
Digital Inputs/Outputs	Up to 12
Analog Inputs	Up to 3
Analog Outputs	Up to 4
Speed Feedback	DC Tachometer / Encoder
Standard Communication Module	None in this configuration

Digital I/O can be used for machine commands and interlocking functions.

Typical signals can include:

• Start
• Stop
• Enable
• Forward
• Reverse
• Jog
• Fault reset
• External interlock
• Operating mode selection

Analog signals can be used for speed references, process signals, current references, or other machine-control functions depending on the application design.

11. Product Introduction

The 20P41AD167RA0NNN PowerFlex DC Drive is designed to bring digital drive control to high-power DC motor applications.

DC motors remain installed in many industrial machines because they were historically selected for their excellent speed control, torque characteristics, and ability to handle demanding production processes.

Replacing the drive does not always require replacing the motor.

This is one of the major reasons a PowerFlex DC drive can be useful in a modernization project.

An existing motor, gearbox, coupling, roll system, winding mechanism, or production machine can potentially remain in service while the electrical drive system is upgraded.

12. Industrial Applications

12.1 Steel and Metal Processing

Large DC motors have historically been used in metal-processing equipment.

Typical applications include:

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

These machines often involve large mechanical inertia and frequent acceleration and deceleration.

Four-quadrant operation can therefore be particularly useful.

12.2 Wire Drawing

Wire-drawing machinery requires controlled motor speed and stable torque.

The drive can be used where the production line requires:

• Stable speed
• Controlled acceleration
• Controlled braking
• Feedback regulation
• Existing DC motor operation

The 100 HP class also makes the model suitable for relatively large wire-processing systems.

12.3 Cable Manufacturing

Cable production equipment can contain several motorized sections that must operate at controlled speeds.

DC motor control can be useful where the existing machine architecture already uses DC motors.

The drive can also support controlled braking and speed regulation where process conditions require it.

12.4 Winding Machinery

Winding is one of the most relevant applications for regenerative DC drives.

During normal winding, the motor provides torque to the reel.

During controlled deceleration or certain tension-control conditions, the motor can move into a regenerative state.

The four-quadrant capability allows the drive to handle these transitions as part of the motor-control system.

12.5 Unwinding Machinery

Unwinding systems frequently require the motor to provide controlled braking torque.

The drive can therefore be used in applications where the motor must alternate between motoring and regenerative operation.

This is common in:

• Paper processing
• Film production
• Metal strip processing
• Cable handling
• Wire processing
• Web converting

12.6 Printing Machinery

Large printing machines may contain several motorized sections.

Older production equipment can contain DC motors that remain mechanically serviceable even though the original drive technology has become outdated.

A DC drive replacement can provide a way to modernize the control portion of the machine while maintaining the existing motor architecture.

12.7 Extrusion Equipment

Extruders often require stable motor speed and torque.

The 20P41AD167RA0NNN can be considered for larger DC-motor-driven extrusion systems where the existing motor is suitable for continued operation.

The drive’s feedback capability can also be useful where speed stability is important to production quality.

13. Material Handling Applications

The drive can also be considered for heavy material-handling equipment.

Examples include:

• Large conveyors
• Reels
• Roll systems
• Lifting-related machinery
• Large process rollers
• Transfer equipment

Where a high-inertia load must be accelerated and then decelerated under controlled conditions, regenerative operation can be particularly useful.

14. High-Inertia Machinery

High-inertia applications are among the situations in which the characteristics of this drive become especially relevant.

A large rotating machine can store significant kinetic energy.

During acceleration, the drive supplies energy to the motor.

During deceleration, the motor can return energy through the regenerative system.

The drive therefore has to manage both directions of energy flow.

Four-quadrant operation provides the control architecture required for these operating conditions.

15. Advantages of the 20P41AD167RA0NNN

15.1 High Current Capacity

The 167 A output rating provides substantial current capability for large DC motors.

This makes the model suitable for 100 HP-class industrial machinery.

15.2 100 HP / 75 kW Motor Class

The 100 HP rating places the drive in a class suitable for major production equipment.

It is considerably larger than the smaller PowerFlex DC models used for low- and medium-power applications.

15.3 Four-Quadrant Operation

Four-quadrant operation provides controlled motoring and regenerative braking in both directions.

This is particularly useful for reversing and high-inertia machinery.

15.4 Regenerative Capability

Regenerative operation is valuable when braking occurs frequently.

It provides a controlled electrical method of handling motor regeneration rather than treating every deceleration event as a purely mechanical braking problem.

15.5 Existing DC Motor Compatibility

One of the biggest practical benefits is compatibility with existing DC motor installations.

If the motor is still mechanically and electrically suitable, the drive can potentially be upgraded without replacing the entire motor system.

15.6 Feedback Support

DC tachometer and encoder feedback capabilities provide flexibility for applications requiring closed-loop speed control.

15.7 Flexible I/O

The available digital and analog I/O makes it easier to connect the drive with external machine-control systems.

15.8 Conformal-Coated Electronics

Conformal coating provides an additional level of protection for electronic assemblies in industrial environments.

15.9 Suitable for Modernization

The drive is well suited to retrofit projects where the machine itself remains valuable but the existing drive technology needs to be modernized.

16. DC Motor Retrofit Advantages

A DC motor retrofit can sometimes be much simpler than converting the entire machine to an AC motor system.

A complete AC conversion could require:

• New motor
• New motor mounting
• Mechanical modifications
• Coupling changes
• New feedback equipment
• New cabling
• Control-program modifications
• Changes to braking equipment
• Production downtime

With a DC drive modernization, some of these changes may not be necessary.

If the existing motor is in good condition, retaining it can reduce the amount of mechanical work required.

17. Typical Retrofit Procedure

A practical retrofit project should normally begin with an inspection of the existing machine.

Important information includes:

1. Existing motor catalog information.
2. Motor armature voltage.
3. Motor armature current.
4. Motor field voltage.
5. Motor field current.
6. Motor horsepower.
7. Motor base speed.
8. Motor maximum speed.
9. Existing tachometer or encoder type.
10. Existing drive configuration.
11. Machine inertia.
12. Acceleration time.
13. Deceleration time.
14. Regenerative requirements.
15. Existing cabinet dimensions.
16. Available incoming voltage.
17. Existing control signals.

This information provides a much better basis for selecting a replacement drive than horsepower alone.

18. Motor Matching Considerations

Motor Parameter	Importance
Armature Voltage	Determines compatibility with drive output
Armature Current	Critical for selecting drive current rating
Motor HP	Establishes the basic power class
Motor kW	Useful for international specifications
Field Voltage	Must match field-control requirements
Field Current	Important for field-supply sizing
Base Speed	Important for speed-control setup
Maximum Speed	Must remain within motor mechanical limits
Feedback Type	Determines feedback interface
Load Inertia	Affects acceleration and braking
Duty Cycle	Affects thermal loading
Regenerative Operation	Determines braking/control requirements

The 100 HP rating of the 20P41AD167RA0NNN should therefore be regarded as an important reference rather than the only selection criterion.

19. Five Recommended Same-Series Models

The following models are closely related regenerative PowerFlex DC models in the same 460/480 V three-phase family.

Model	Input	Output Current	Motor Rating	Power	Frame	Approx. Dimensions	Approx. Weight
20P41AD129RA0NNN	480 VAC, 3 Ph	129 A	75 HP	56 kW	A	Approx. 359 × 267 × 287 mm	Approx. 14.5 kg
20P41AD167RA0NNN	480 VAC, 3 Ph	167 A	100 HP	75 kW	B	Approx. 311 × 388 × 350 mm	Approx. 25.5 kg
20P41AD207RA0NNN	480 VAC, 3 Ph	207 A	125 HP	93 kW	B	Approx. 311 × 388 × 350 mm	Approx. 25.5 kg
20P41AD250RA0NNN	480 VAC, 3 Ph	250 A	150 HP	112 kW	B	Approx. 311 × 388 × 350 mm	Approx. 25.5 kg
20P41AD330RA0NNN	480 VAC, 3 Ph	330 A	200 HP	149 kW	B	Approx. 311 × 388 × 350 mm	Approx. 25.5 kg

The 20P41AD129RA0NNN is the lower-current option in this group and is suitable for the 75 HP class.

The 20P41AD167RA0NNN is the 100 HP / 167 A model discussed in detail in this document.

The 20P41AD207RA0NNN, 20P41AD250RA0NNN, and 20P41AD330RA0NNN provide progressively higher current and motor capacity for larger machines.

The listed dimensions and weights for the Frame B models are useful for preliminary planning. Final cabinet design should use the mechanical drawing for the exact catalog number and installation configuration.

20. Same-Series Comparison

Model	Current	HP	kW	Frame	Typical Position
20P41AD129RA0NNN	129 A	75 HP	56 kW	A	Medium-large DC motor
20P41AD167RA0NNN	167 A	100 HP	75 kW	B	100 HP class
20P41AD207RA0NNN	207 A	125 HP	93 kW	B	125 HP class
20P41AD250RA0NNN	250 A	150 HP	112 kW	B	150 HP class
20P41AD330RA0NNN	330 A	200 HP	149 kW	B	200 HP class

This progression makes it relatively straightforward to identify the appropriate current class when the motor rating increases.

However, the final choice should always be checked against the motor’s actual armature current and application duty.

21. Five Popular Same-Brand Models

The following are five widely used related models from the broader Allen-Bradley PowerFlex range.

They belong to different PowerFlex product families and are not direct replacements for the 20P41AD167RA0NNN. They are included as same-brand alternatives for comparison, particularly when evaluating DC-drive modernization versus a new AC-drive architecture.

Model	Product Series	Drive Type	Voltage Class	Approx. Current Class	Typical Motor Class	Dimensions	Weight
25B-D017N114	PowerFlex 525	AC Variable Frequency Drive	480 VAC Class	17 A Class	10 HP Class	Frame-dependent	Frame-dependent
25B-D030N114	PowerFlex 525	AC Variable Frequency Drive	480 VAC Class	30 A Class	15 HP Class	Frame-dependent	Frame-dependent
20G11ND077AA0NNNNN	PowerFlex 755	AC Drive	480 VAC Class	77 A Class	50 HP Class	Frame-dependent	Frame-dependent
20G11ND156AA0NNNNN	PowerFlex 755	AC Drive	480 VAC Class	156 A Class	100 HP Class	Frame-dependent	Frame-dependent
22F-D060N103	PowerFlex 4M	Compact AC Drive	480 VAC Class	6 A Class	3 HP Class	Frame-dependent	Frame-dependent

The dimensions and weights of these AC-drive models vary according to frame size and configuration, so they should not be treated as interchangeable physical replacements for the Frame B 20P41AD167RA0NNN.

For an actual retrofit, the physical enclosure dimensions, heat dissipation, mounting holes, cable-entry arrangement, and accessory configuration should be checked separately.

22. PowerFlex DC Versus Other PowerFlex Families

The 20P41AD167RA0NNN is fundamentally different from the PowerFlex 525, PowerFlex 755, and PowerFlex 4M products listed above.

The main distinction is the motor technology.

Characteristic	20P41AD167RA0NNN	Typical PowerFlex AC Drive
Motor Type	DC Motor	AC Motor
Main Control Architecture	DC Drive	Variable Frequency Drive
Four-Quadrant DC Regeneration	Yes	Configuration-dependent
Existing DC Motor Retrofit	Excellent fit	Requires motor-system conversion
100 HP DC Application	Yes	Not applicable as a direct DC replacement
DC Tachometer Feedback	Supported	Not normally used in the same way
Encoder Feedback	Supported	Common on advanced AC systems
Typical Retrofit Strategy	Replace DC drive	Replace motor and drive when converting

Therefore, a PowerFlex 525 or PowerFlex 755 should not be selected as a direct drop-in replacement simply because its horsepower rating is similar.

The 20P41AD167RA0NNN is specifically intended for DC motor control.

23. Typical Machine Types

The 20P41AD167RA0NNN can be considered for machinery such as:

• Large winding machines
• Unwinding systems
• Wire-drawing machines
• Cable-processing equipment
• Paper machines
• Printing equipment
• Coating lines
• Laminating machinery
• Slitting equipment
• Extrusion machinery
• Metal-processing lines
• Rolling equipment
• Coil-processing systems
• Material-handling equipment
• Large conveyors
• High-inertia production machinery
• Existing DC motor production lines

24. Advantages in Continuous Production

For continuous production equipment, downtime is often a major concern.

A machine that has been mechanically optimized over many years may not need to be completely redesigned simply because its original drive needs modernization.

A DC drive replacement can provide an opportunity to retain:

• Existing DC motor
• Existing gearbox
• Existing coupling
• Existing rolls
• Existing mechanical transmission
• Existing feedback arrangement
• Existing machine structure

while upgrading the electrical drive system.

25. Advantages for High-Inertia Loads

High-inertia applications place greater demands on acceleration and deceleration control.

A drive must not only accelerate the motor but also manage the energy associated with the rotating load.

The regenerative capability of the 20P41AD167RA0NNN is therefore useful for machinery in which deceleration is a regular part of the production process.

This is particularly relevant to large reels, drums, rolls, winding systems, and other rotating equipment.

26. Advantages for Reversing Applications

Some industrial machines repeatedly change direction.

Examples include:

• Reversing mills
• Test stands
• Positioning equipment
• Certain winding systems
• Process machinery

In these applications, the motor may alternate between forward motoring, forward braking, reverse motoring, and reverse braking.

Four-quadrant operation provides the control structure needed for these operating states.

27. Cabinet and Installation Requirements

Because the drive is an IP20 / NEMA/UL Type Open product, appropriate cabinet installation is important.

The cabinet should provide:

• Adequate ventilation
• Appropriate ambient temperature control
• Proper grounding
• Correct electrical clearances
• Suitable mechanical support
• Protection against direct moisture
• Protection against conductive contamination
• Appropriate cable routing
• Maintenance access

Power cables and feedback cables should be routed appropriately to reduce the possibility of electrical interference.

Feedback wiring deserves particular attention because tachometer and encoder signals can be sensitive to noise generated by high-power electrical equipment.

28. Maintenance Considerations

The digital architecture of the PowerFlex DC series provides a more modern control environment than many older generations of DC drive equipment.

For maintenance personnel, this can simplify work associated with:

• Parameter checking
• Fault investigation
• I/O testing
• Feedback troubleshooting
• Motor-current monitoring
• Drive replacement
• Control-system integration
• Preventive maintenance

In a production environment, having a standardized drive platform can also make spare-parts management and maintenance training easier when multiple machines use related drive families.

29. Product Selection Checklist

Before purchasing or installing a 20P41AD167RA0NNN, the following information should be confirmed.

Selection Item	Check
Motor Type	DC motor
Motor Power	Approximately 100 HP / 75 kW
Armature Current	Confirm against 167 A drive rating
Armature Voltage	Confirm motor compatibility
Input Voltage	480 VAC class
Input Phase	3 Phase
Field Voltage	Confirm field requirements
Field Current	Confirm field requirements
Feedback	Tachometer or encoder
Regeneration	Required / Not Required
Maximum Speed	Confirm motor limit
Base Speed	Confirm motor data
Load Inertia	Determine acceleration/deceleration requirements
Ambient Temperature	Confirm cabinet/environment
Cabinet Space	Confirm approximately 311 × 388 × 350 mm envelope
Drive Weight	Approximately 25.5 kg
Communication	External communication requirement must be evaluated
HIM	This configuration has no standard HIM

This checklist is particularly important when replacing an older drive.

30. Key Specifications at a Glance

Category	Specification
Model	20P41AD167RA0NNN
Brand	Allen-Bradley
Series	PowerFlex DC
Drive Category	Regenerative DC Drive
Input Voltage	480 VAC
Input	3 Phase
Input Type	6 Pulse
Output Current	167 A
Motor Rating	100 HP
Motor Power	75 kW
Operation	Four-Quadrant
Frame	B
Enclosure	IP20
Enclosure Type	NEMA/UL Type Open
Conformal Coating	Yes
Field Supply	Single-Phase Regulated
Feedback	DC Tachometer / Encoder
Digital I/O	Up to 12
Analog Inputs	Up to 3
Analog Outputs	Up to 4
HIM	Blank Plate / No HIM
Communication Module	None Standard
Dimensions	Approx. 311 × 388 × 350 mm
Weight	Approx. 25.5 kg
Mounting	Surface / Panel Mount
Main Application	Industrial DC Motor Control
Main Retrofit Application	Existing DC Motor Modernization

31. Product Advantages Summary

Advantage	Practical Benefit
167 A Output	Suitable for large DC motor applications
100 HP Rating	Supports substantial industrial machinery
75 kW Class	Suitable for high-power process equipment
Four-Quadrant Operation	Controlled motoring and braking in both directions
Regenerative Capability	Suitable for frequent deceleration
480 VAC Three-Phase Input	Fits common industrial power systems
DC Motor Compatibility	Allows existing DC motors to be retained
Tachometer Support	Enables closed-loop speed control
Encoder Support	Provides additional feedback flexibility
Flexible I/O	Supports machine-level control interfaces
Conformal Coating	Additional electronic protection
Frame B Construction	Suitable for higher-power applications
IP20 Construction	Suitable for protected control cabinets
Retrofit Capability	Useful for modernization of older machinery

32. Overall Product Description

The Allen-Bradley 20P41AD167RA0NNN PowerFlex DC Drive is a 480 VAC, three-phase, 167 A regenerative DC drive designed for 100 HP / approximately 75 kW industrial DC motor applications.

Its four-quadrant operating capability allows the motor to operate under both motoring and regenerative conditions in both directions. This makes the drive particularly suitable for machinery involving high inertia, repeated acceleration and deceleration, reversing, winding, unwinding, and controlled braking.

The drive uses Frame B construction and an IP20, NEMA/UL Type Open enclosure with conformal coating. Its approximate dimensions are 311 × 388 × 350 mm, and its approximate weight is 25.5 kg.

The integrated feedback capability supports DC tachometer and encoder applications, while the available digital and analog I/O provides flexibility when integrating the drive into a larger machine-control system.

For existing DC motor installations, the 20P41AD167RA0NNN can be particularly useful as part of a modernization strategy. Instead of replacing the entire machine, the electrical drive section can be upgraded while the existing motor and mechanical equipment remain in service, provided that the motor and machine are suitable for continued operation.

33. Final Summary

The 20P41AD167RA0NNN is a high-power Allen-Bradley PowerFlex DC regenerative drive in the 100 HP / 75 kW class.

Its main specifications are:

480 VAC, 3-phase input

167 A output current

100 HP / approximately 75 kW motor rating

Four-quadrant regenerative operation

6-pulse input

Frame B

IP20 / NEMA/UL Type Open

Conformal-coated construction

DC tachometer and encoder feedback capability

Up to 12 digital I/O

Up to 3 analog inputs

Up to 4 analog outputs

Approximately 311 × 388 × 350 mm

Approximately 25.5 kg

The model is particularly appropriate for large DC motor applications where controlled speed, torque, braking, reversing, and regeneration are required.

Its strongest practical application is in industrial machinery that already uses a substantial DC motor and needs a modern, digitally controlled drive without necessarily replacing the entire mechanical system.

The most closely related models include 20P41AD129RA0NNN, 20P41AD207RA0NNN, 20P41AD250RA0NNN, and 20P41AD330RA0NNN, which provide different current and horsepower levels within the same regenerative DC drive family.

For applications considering a transition from DC to AC motor technology, models from the PowerFlex 525, PowerFlex 755, and other PowerFlex AC families can also be evaluated, but they represent a different drive architecture and should not be treated as direct replacements without considering the motor, mechanical system, feedback, braking, and control requirements.