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1. Product Overview

The Allen-Bradley 20P41AE270RA0NNN is a high-power PowerFlex DC regenerative drive designed for industrial DC motor applications requiring substantial current capacity, controlled speed, four-quadrant operation, and regenerative braking.

This model is rated at 270 A and 200 HP / approximately 149 kW for its normal-duty motor rating. It is designed for the 575 V AC three-phase class and uses a six-pulse input configuration.

The drive is part of the PowerFlex DC series and is configured for four-quadrant regenerative operation. This makes it particularly suitable for machinery where the motor must not only accelerate and run under load, but also decelerate, reverse direction, and operate in regenerative conditions.

The 20P41AE270RA0NNN is especially relevant to large industrial machinery such as winding systems, unwinding systems, paper and converting machinery, metal-processing equipment, large conveyors, high-inertia machinery, roll drives, and existing DC motor installations.

The standard configuration includes IP20 / NEMA/UL Type Open construction, conformal coating, a blank plate in place of a HIM, and no standard communication module. The field supply is a single-phase regulated field supply.

For applications where an existing 200 HP DC motor is still mechanically suitable, this type of drive can be particularly useful because the drive modernization can potentially be performed without replacing the complete motor and mechanical transmission system.

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2. Brand and Product Series

Item	Specification
Brand	Allen-Bradley
Product Series	PowerFlex DC
Product Type	Regenerative DC Drive
Catalog Number	20P41AE270RA0NNN
Motor Type	DC Motor
Input Voltage Class	575 V AC
Input Phase	Three Phase
Input Type	6 Pulse
Rated Current	270 A
Normal-Duty Motor Rating	200 HP
Normal-Duty Power	Approximately 149 kW
Motor Operation	Four Quadrant / Regenerative
Field Supply	Single Phase Regulated
Frame	Frame B
Enclosure	IP20 / NEMA/UL Type Open
Conformal Coating	Yes
HIM	No HIM / Blank Plate
Communication Module	None in standard configuration

The Allen-Bradley 20P41AE270RA0NNN belongs to the PowerFlex DC family.

Within the 575 V class regenerative PowerFlex DC range, the 270 A model occupies the 200 HP / approximately 149 kW rating position.

The current rating, four-quadrant regenerative configuration, regulated field supply, and 200 HP rating make this model substantially larger than the 50 HP, 75 HP, and 100 HP models in the same 575 V product group.

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3. Main Technical Parameters

Parameter	Specification
Brand	Allen-Bradley
Series	PowerFlex DC
Model / Catalog Number	20P41AE270RA0NNN
Drive Type	Regenerative DC Drive
Input Voltage	575 V AC class
Input Phase	3 Phase
Input Type	6 Pulse
Motor Operation	Four Quadrant / Regenerative
Rated Current	270 A
Normal-Duty Motor Rating	200 HP
Normal-Duty Power	Approximately 149 kW
Field Supply	Single Phase Regulated
Frame Size	Frame B
Enclosure	IP20
Enclosure Type	NEMA/UL Type Open
Conformal Coating	Yes
Human Interface Module	No HIM / Blank Plate
Communication	No standard communication module
Approx. Height	311 mm
Approx. Width	388 mm
Approx. Depth	350 mm
Approx. Dimensions	311 × 388 × 350 mm
Approx. Height	12.2 in
Approx. Width	15.3 in
Approx. Depth	13.8 in
Approx. Drive Weight	29.5 kg
Approx. Packaged Weight	31.5 kg
Installation	Electrical Cabinet / Panel
Application	Industrial DC Motor Control

The 270 A rating and 200 HP description are part of the product’s catalog configuration. The product is specified as a 600 VAC class, three-phase, 270 A, 200 HP PowerFlex DC drive with IP20 protection and a four-quadrant regenerative motor operating configuration.

The Frame B mechanical data gives an approximate envelope of 311 × 388 × 350 mm, while the Frame B weight table places the 575 V 270 A rating at approximately 29.5 kg drive weight and 31.5 kg including packaging.

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4. Product Identification

The complete catalog number is:

20P41AE270RA0NNN

For industrial procurement and maintenance, using the complete catalog number is important.

A description such as “200 HP PowerFlex DC drive” is useful for general identification, but it does not provide enough information to guarantee that a replacement has the same voltage class, current rating, regenerative configuration, enclosure, field-supply arrangement, and option configuration.

The full catalog number should therefore be recorded in the machine documentation, electrical drawings, spare-parts database, and maintenance records.

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5. 200 HP / 149 kW Motor Capacity

The 20P41AE270RA0NNN is rated at 200 HP, corresponding to approximately 149 kW.

This places the model in a high-power industrial DC motor category.

A 200 HP DC motor can be used in machinery with substantial mechanical loads and significant stored rotational energy. In these applications, the drive needs to provide more than simple speed adjustment.

It must also be able to control acceleration, torque, deceleration, and regenerative operating conditions.

The 270 A current rating provides the drive with a substantial current-handling capability appropriate to this class of motor application.

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6. 270 Amp Current Rating

The 270 A output current rating is one of the defining characteristics of this model.

Current capacity is particularly important in DC motor applications because armature current is closely associated with motor torque production.

Compared with the 135 A 100 HP model, the 270 A model provides approximately twice the rated current capacity.

This makes the 20P41AE270RA0NNN suitable for considerably larger DC motor systems.

The 270 A rating is also useful when comparing adjacent models within the same PowerFlex DC family.

For example:

Model	Rated Current	Normal-Duty Rating
20P41AE101RA0NNN	101.3 A	75 HP / 56 kW
20P41AE135RA0NNN	135 A	100 HP / 75 kW
20P41AE270RA0NNN	270 A	200 HP / 149 kW
20P41AE405RA0NNN	405 A	300 HP / 224 kW

The 270 A model therefore represents a substantial step up from the 135 A version and is intended for much larger motor systems.

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7. Four-Quadrant Regenerative Operation

One of the most important characteristics of the 20P41AE270RA0NNN is its four-quadrant regenerative operating capability.

Four-quadrant operation means that the drive can control motor torque in both directions while also handling motoring and regenerative operating states.

The four operating conditions can be described as:

Quadrant	Motor Direction	Torque Condition
Quadrant I	Forward	Forward Motoring
Quadrant II	Forward	Regeneration
Quadrant III	Reverse	Reverse Motoring
Quadrant IV	Reverse	Regeneration

This arrangement is particularly useful for machinery requiring frequent acceleration and deceleration.

It is also valuable when the machine needs controlled forward and reverse operation.

For large rotating loads, the regenerative quadrants allow the drive to control the energy produced by the motor during deceleration.

The product is explicitly specified for four-quadrant regenerative motor operation.

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8. Regenerative Braking

Regenerative braking is a major reason to select a four-quadrant DC drive.

When a large rotating mass decelerates, the motor can operate as a generator.

Instead of simply converting the kinetic energy into heat through a conventional braking resistor or mechanical brake, a regenerative drive can manage the generated electrical energy through its regenerative power-conversion system.

This is particularly useful for:

• Large rolls
• Winders
• Unwinders
• High-inertia conveyors
• Reversing machines
• Metal-processing equipment
• Paper machinery
• Converting machinery
• Large rotating production equipment

For a machine that repeatedly accelerates and decelerates a large load, regenerative operation can be an important part of the overall energy and braking strategy.

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9. 575 V AC Three-Phase Input

The 20P41AE270RA0NNN belongs to the 575 V AC three-phase PowerFlex DC product group.

The product description identifies it as a 600 VAC class, three-phase drive.

This voltage class is commonly associated with larger industrial power systems.

A 200 HP motor installation can represent a substantial electrical load, so the incoming power system needs to be properly engineered.

When selecting this drive for an existing installation, engineers should verify:

• Actual incoming voltage
• Transformer configuration
• Transformer capacity
• Short-circuit rating
• Protective devices
• Grounding
• Line impedance
• Harmonic considerations
• Cabinet wiring
• Cable sizing
• Motor armature requirements
• Field-supply requirements

The drive’s nominal voltage class should not be used as a substitute for checking the actual site electrical system.

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10. Six-Pulse Input Configuration

The 20P41AE270RA0NNN uses a six-pulse input arrangement.

Six-pulse power conversion is a well-established architecture for industrial DC drives.

For a large industrial installation, the six-pulse configuration should be considered together with the plant’s transformer and electrical distribution system.

System-level engineering may include evaluation of line impedance, harmonics, protective devices, grounding, and applicable electrical standards.

The six-pulse arrangement is therefore not simply a catalog specification; it is part of the complete power-system design.

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11. Regulated Field Supply

The 20P41AE270RA0NNN includes a single-phase regulated field supply.

The field system is an important part of a conventional DC motor installation.

The motor field establishes the magnetic field required for motor operation, and field regulation influences the motor’s operating characteristics.

When using this drive with an existing DC motor, the motor nameplate field voltage and field current should be compared carefully with the drive’s field-supply capability.

The motor field circuit should never be assumed to be compatible simply because the motor horsepower matches the drive horsepower.

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12. Frame B Mechanical Construction

The 20P41AE270RA0NNN uses Frame B construction.

Frame information is particularly important for cabinet design.

The Frame B dimensions are approximately:

Mechanical Parameter	Approximate Dimension
Height	311 mm
Width	388 mm
Depth	350 mm
Height	12.2 in
Width	15.3 in
Depth	13.8 in
Drive Weight	29.5 kg
Drive + Packaging	31.5 kg

The technical data lists the Frame B body dimensions as approximately 311 mm × 388 mm × 350 mm.

The 575 V rating code 270 is grouped with the approximately 29.5 kg drive / 31.5 kg packaged weight category.

These dimensions are useful for preliminary cabinet planning.

Final cabinet design should also account for ventilation space, terminal access, cable bending radius, service access, mounting hardware, and surrounding components.

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13. IP20 / NEMA/UL Type Open Construction

The 20P41AE270RA0NNN is specified as an IP20, NEMA/UL Type Open drive.

This means that the drive is intended to be installed within a suitable electrical cabinet or protected enclosure.

The cabinet must provide an appropriate environment for the drive.

The installation should protect the electronics from:

• Excessive dust
• Moisture
• Condensation
• Conductive contamination
• Excessive heat
• Corrosive atmosphere
• Mechanical contamination
• Inappropriate vibration

For a 200 HP drive, cabinet ventilation is especially important because the equipment can generate significant heat during continuous operation.

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14. Conformal Coating

The standard configuration includes conformal coating.

Conformal coating provides an additional protective layer over electronic components.

This can be useful in industrial environments where electronic assemblies may be exposed to humidity or airborne contaminants.

However, conformal coating should not be interpreted as meaning that the drive can be installed without a suitable enclosure.

The IP20 / NEMA/UL Type Open construction still requires an appropriate installation environment.

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15. No HIM / Blank Plate

The catalog configuration specifies No HIM, with a blank plate in place of a standard Human Interface Module.

This configuration can be useful in systems where the drive is controlled from an external control panel, PLC, machine controller, or other automation system.

A blank-plate configuration also makes sense when local operator interaction through a permanently mounted keypad is not part of the machine design.

For maintenance and commissioning, however, the control strategy should be considered carefully.

The absence of a standard HIM means that the machine designer should have an appropriate method for configuration, diagnostics, parameter management, and troubleshooting.

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16. No Standard Communication Module

The 20P41AE270RA0NNN standard configuration is listed with no standard communication module.

This does not prevent the drive from being incorporated into an industrial control system.

It simply means that the catalog configuration is not supplied with a communication module as part of the standard product configuration.

For a modernization project, the existing machine interface should be reviewed.

Some machines use hardwired analog and digital signals, while others use a network-based control architecture.

The appropriate control method should be selected according to the complete machine design.

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17. Main Applications

The 20P41AE270RA0NNN is particularly appropriate for industrial machinery requiring high-power DC motor control.

Typical application areas include:

• Large winding machines
• Unwinding systems
• Paper machinery
• Paper converting machinery
• Printing equipment
• Metal-processing lines
• Roll drives
• Slitter-rewinders
• Tension-control systems
• Large conveyors
• High-inertia machines
• Reversing machinery
• Existing 200 HP DC motor installations
• Industrial machine modernization projects
• Production equipment requiring regenerative braking

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18. Winding Applications

Winding machinery often needs accurate control of speed and torque.

As a roll changes diameter, the motor speed and torque requirements can change substantially.

A large winder can also have significant rotational inertia.

During acceleration, the drive supplies energy to the motor.

During deceleration, the motor can move into a regenerative operating condition.

The four-quadrant capability of the 20P41AE270RA0NNN makes this type of operating cycle well suited to the drive’s intended architecture.

The drive can therefore form part of a larger control system incorporating:

• Speed feedback
• Tension feedback
• Dancer control
• PLC logic
• Operator controls
• Machine interlocks
• Production-line synchronization

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19. Unwinding Applications

Unwind equipment has its own set of control requirements.

As material is removed from a roll, the roll diameter decreases.

The machine therefore needs to continuously adjust the motor operating condition.

The DC drive can provide the required controlled motor operation while the machine control system manages process-specific tension and speed calculations.

Four-quadrant operation can also be useful where the motor transitions between motoring and regenerative operation.

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20. Paper and Converting Machinery

Paper-processing and converting machinery represents an important class of industrial applications for DC drive systems.

Large rolls, tension sections, winders, unwinders, coaters, slitters, and similar equipment may require controlled speed and torque.

Many existing production machines were originally designed around DC motors.

In such installations, replacing an obsolete drive while retaining the existing motor can sometimes be considerably less disruptive than replacing the complete drive-and-motor system.

The 20P41AE270RA0NNN can therefore be considered for modernization projects involving compatible high-power DC motors.

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21. Metal-Processing Applications

Metal-processing equipment can require substantial motor power and controlled acceleration.

Potential applications include:

• Roll drives
• Payoff reels
• Tension sections
• Processing rolls
• Material handling
• Reversing equipment
• Large rotating machinery

A 200 HP / 270 A DC drive provides significantly more current capacity than the smaller PowerFlex DC models.

This makes the 20P41AE270RA0NNN more suitable for large industrial mechanical loads.

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22. Large Conveyor Applications

Large conveyors can have considerable mechanical inertia.

The starting sequence must be controlled so that the motor does not experience an unnecessarily abrupt acceleration.

Stopping can be even more important.

When a large conveyor decelerates, the mechanical system can return significant kinetic energy to the motor.

A regenerative drive can control this operating condition.

For conveyor applications, the drive should be evaluated together with the mechanical braking system, emergency-stop system, safety architecture, load characteristics, and conveyor control logic.

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23. High-Inertia Machinery

High-inertia machinery is one of the most natural applications for regenerative drive technology.

Examples include:

• Large drums
• Rolls
• Flywheel-type loads
• Large fans
• Winding systems
• Unwinding systems
• High-speed rotating equipment
• Large processing machinery

During deceleration, the stored mechanical energy must go somewhere.

The regenerative drive provides an electrical method of managing this energy.

This can be especially useful when the machine performs frequent production cycles involving acceleration, operation, deceleration, and restart.

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24. Reversing Applications

Some production machines need to reverse the motor direction repeatedly.

A typical operating cycle could involve:

1. Accelerating forward.
2. Operating at production speed.
3. Controlled deceleration.
4. Stopping.
5. Accelerating in reverse.
6. Running in reverse.
7. Regeneratively decelerating.
8. Repeating the sequence.

Four-quadrant operation is particularly relevant to this type of application because both motor direction and torque direction must be controlled.

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25. Existing DC Motor Retrofit

A major practical application for the 20P41AE270RA0NNN is modernization of existing DC motor machinery.

Consider an older production line with a 200 HP DC motor.

If the motor, gearbox, coupling, bearings, and mechanical transmission remain in good condition, replacing the old drive may be considerably simpler than replacing the complete motor and mechanical system.

A drive modernization project can potentially reduce the amount of mechanical modification required.

The actual feasibility depends on:

• Motor condition
• Armature voltage
• Armature current
• Field voltage
• Field current
• Feedback device
• Motor speed range
• Load characteristics
• Regenerative requirements
• Existing cabinet
• Control system

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26. Main Product Advantages

High Current Capacity

The 270 A rating gives the drive substantial current-handling capability for large DC motor systems.

This is one of the main differences between this model and smaller PowerFlex DC products.

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200 HP Motor Rating

The 200 HP / approximately 149 kW rating makes the model appropriate for high-power industrial machinery.

It is intended for substantially larger motor systems than the 50 HP, 75 HP, and 100 HP models in the same 575 V family.

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Four-Quadrant Operation

Four-quadrant operation allows the drive to control forward and reverse motoring as well as regenerative conditions.

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

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Regenerative Braking

Regenerative operation provides controlled electrical braking for applications in which the motor repeatedly enters generating operation.

This can be particularly useful for large rolls, winders, unwinders, and other high-inertia equipment.

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Regulated Field Supply

The integrated regulated field-supply configuration supports the field requirements of compatible DC motors.

This provides a more complete DC motor control solution than a simple armature-only controller.

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Frame B Package

The Frame B construction gives the 270 A model a relatively compact mechanical envelope for its power class.

The approximate body size is 311 × 388 × 350 mm.

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Conformal-Coated Electronics

The conformal-coated configuration provides additional protection to the electronic assemblies.

This is useful in industrial environments where environmental contamination may be a concern.

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Existing-Motor Retrofit Potential

For plants with established DC motor systems, a PowerFlex DC drive can provide a practical modernization path without automatically requiring complete conversion to AC motor technology.

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27. Five Recommended Same-Series Models

The following models are closely related PowerFlex DC 575 V regenerative models and are useful for comparison with the 20P41AE270RA0NNN.

Model / Catalog Number	Rated Current	Normal-Duty Rating	Power	Frame	Approx. Dimensions	Approx. Drive Weight
20P41AE067RA0NNN	67.5 A	50 HP	37 kW	B	311 × 388 × 350 mm	25.5 kg
20P41AE101RA0NNN	101.3 A	75 HP	56 kW	B	311 × 388 × 350 mm	25.5 kg
20P41AE135RA0NNN	135 A	100 HP	75 kW	B	311 × 388 × 350 mm	25.5 kg
20P41AE270RA0NNN	270 A	200 HP	149 kW	B	311 × 388 × 350 mm	29.5 kg
20P41AE405RA0NNN	405 A	300 HP	224 kW	B	311 × 388 × 350 mm	32 kg

The 575 V rating codes and Frame B weight groups are listed together in the PowerFlex DC technical data.

The Frame B dimensional envelope is approximately 311 × 388 × 350 mm.

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28. 20P41AE067RA0NNN – 50 HP

The 20P41AE067RA0NNN is a smaller regenerative PowerFlex DC model within the same 575 V family.

It provides approximately 67.5 A and a 50 HP / 37 kW normal-duty rating.

This model can be considered for smaller DC motor systems where the 270 A capacity of the main model would be excessive.

Its approximate Frame B dimensions are 311 × 388 × 350 mm, with approximately 25.5 kg drive weight.

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29. 20P41AE101RA0NNN – 75 HP

The 20P41AE101RA0NNN provides approximately 101.3 A and a 75 HP / 56 kW rating.

It is useful for applications that fall between the 50 HP and 100 HP range.

The model retains the same general 575 V regenerative PowerFlex DC architecture and Frame B mechanical envelope.

Its approximate drive weight is 25.5 kg.

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30. 20P41AE135RA0NNN – 100 HP

The 20P41AE135RA0NNN provides approximately 135 A and a 100 HP / 75 kW normal-duty rating.

It is approximately half the current rating of the 270 A model.

For a machine using a 100 HP DC motor, this model may be the more appropriate size.

For a 200 HP application, however, the motor nameplate and application duty should be checked carefully before considering the smaller 135 A model.

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31. 20P41AE270RA0NNN – 200 HP

The 20P41AE270RA0NNN is the main model covered in this description.

Its primary specifications are:

Parameter	Value
Model	20P41AE270RA0NNN
Current	270 A
Motor Rating	200 HP
Power	Approximately 149 kW
Voltage Class	575 V AC
Input	3 Phase / 6 Pulse
Operation	Four Quadrant / Regenerative
Field Supply	Single Phase Regulated
Frame	B
Dimensions	Approximately 311 × 388 × 350 mm
Weight	Approximately 29.5 kg
Enclosure	IP20 / NEMA/UL Type Open
Conformal Coating	Yes
HIM	Blank Plate / No HIM
Communication	None standard

This combination makes the model a high-power regenerative DC drive for industrial applications.

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32. 20P41AE405RA0NNN – 300 HP

The 20P41AE405RA0NNN is the larger 575 V model in this comparison.

It is rated at approximately 405 A and 300 HP / 224 kW.

Its approximate drive weight is 32 kg.

The model retains the Frame B classification and approximately 311 × 388 × 350 mm Frame B envelope according to the technical data.

It can therefore be considered when a 200 HP drive does not provide sufficient capacity.

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33. Same-Series Comparison

Model / Catalog Number	Current	HP	kW	Frame	Approx. Dimensions	Approx. Weight
20P41AE067RA0NNN	67.5 A	50 HP	37 kW	B	311 × 388 × 350 mm	25.5 kg
20P41AE101RA0NNN	101.3 A	75 HP	56 kW	B	311 × 388 × 350 mm	25.5 kg
20P41AE135RA0NNN	135 A	100 HP	75 kW	B	311 × 388 × 350 mm	25.5 kg
20P41AE270RA0NNN	270 A	200 HP	149 kW	B	311 × 388 × 350 mm	29.5 kg
20P41AE405RA0NNN	405 A	300 HP	224 kW	B	311 × 388 × 350 mm	32 kg

This table shows the progression of current and motor capacity within the 575 V regenerative PowerFlex DC range.

The physical Frame B envelope remains approximately the same across this group, while the drive weight increases with the larger current ratings.

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34. Five Popular Related Allen-Bradley Models

The following five models belong to other PowerFlex families.

They are related products rather than direct replacements for the 20P41AE270RA0NNN.

The main difference is that these are AC variable-frequency drive products, whereas the 20P41AE270RA0NNN is a regenerative DC drive.

Model / Catalog Number	Series	Drive Type	Voltage Class	Current / Rating	Approx. Power	Approx. Dimensions	Approx. Weight
25B-D010N114	PowerFlex 525	AC Drive	380…480 V AC	10.5 A	5 HP / 4 kW	Configuration-dependent	Configuration-dependent
25B-D017N114	PowerFlex 525	AC Drive	380…480 V AC	17 A class	10 HP / 7.5 kW	Configuration-dependent	Approx. 3.03 kg
25B-D030N114	PowerFlex 525	AC Drive	380…480 V AC	30 A	20 HP / 15 kW ND	Configuration-dependent	Configuration-dependent
20G11ND077AA0NNNNN	PowerFlex 755	AC Drive	480 V AC class	77 A class	50 HP class	Configuration-dependent	Configuration-dependent
20G11ND156AA0NNNNN	PowerFlex 755	AC Drive	480 V AC / 650 V DC	156 A	125 HP / 93 kW ND	Configuration-dependent	Approx. 68.04 kg

These products should be viewed as same-brand alternatives for broader machine modernization and AC-drive applications rather than direct catalog-number substitutions.

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35. PowerFlex 525 Related Models

The PowerFlex 525 family is designed for compact AC motor applications.

Compared with the 20P41AE270RA0NNN, these drives are substantially smaller in power rating.

For example, the 25B-D010N114 is around the 5 HP class, while the 25B-D017N114 is around the 10 HP class.

They are therefore not suitable as direct replacements for a 200 HP DC drive.

They are useful as comparison models when a machine is being redesigned around smaller AC motors.

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36. PowerFlex 755 Related Models

The PowerFlex 755 family represents a larger AC drive platform.

The 20G11ND077AA0NNNNN is a 480 V class PowerFlex 755 configuration in the approximately 77 A range.

The 20G11ND156AA0NNNNN is a larger configuration rated at approximately 156 A and 125 HP / 93 kW normal duty.

These products can be relevant when an existing DC machine is being converted to AC motor technology.

However, such a conversion normally requires evaluation of the motor, mechanical coupling, gearbox, feedback, control system, braking method, and overall machine design.

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37. DC Drive Versus AC Drive

A major engineering decision during modernization is whether to maintain the existing DC motor or convert the machine to an AC motor.

Item	PowerFlex DC Approach	AC Drive Modernization
Existing DC Motor	Can potentially remain	Usually replaced with AC motor
Mechanical System	Potentially retained	May require modifications
Motor Coupling	Potentially retained	May need modification
Existing Field System	Retained where compatible	Normally eliminated
Four-Quadrant Operation	Available in regenerative configuration	Depends on AC drive architecture
Regeneration	Native regenerative DC configuration	Requires appropriate regenerative solution
Motor Maintenance	DC brush/commutator maintenance remains	AC motor construction generally simpler
Retrofit Scope	Potentially focused on electrical system	May involve motor and mechanical conversion
Production Downtime	Potentially lower	Potentially higher
Best Use	Existing DC machinery	New or converted AC machinery

Neither approach should be selected based on horsepower alone.

The existing motor, machine mechanics, control architecture, production requirements, maintenance strategy, and future modernization plans should all be considered.

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38. Motor Matching Parameters

Before selecting the 20P41AE270RA0NNN for a specific machine, the motor should be checked against the drive.

Motor Parameter	Required Check
Motor Type	DC motor
Motor Power	Approximately 200 HP class
Armature Voltage	Verify against drive/application
Armature Current	Verify against 270 A capacity
Field Voltage	Verify
Field Current	Verify
Base Speed	Verify
Maximum Speed	Verify
Feedback	Tachometer / encoder requirements
Load Inertia	Verify
Acceleration Time	Verify
Deceleration Time	Verify
Regenerative Duty	Verify
Duty Cycle	Verify
Motor Insulation	Check condition
Cooling	Check motor cooling system
Mechanical Coupling	Check condition
Bearings	Check condition

A 200 HP motor rating by itself does not guarantee compatibility.

The complete electrical and mechanical system needs to be evaluated.

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39. Cabinet Installation

The drive is an IP20 / NEMA/UL Type Open product and should normally be installed inside an appropriate electrical enclosure.

The nominal Frame B body dimensions are:

311 mm × 388 mm × 350 mm

However, the cabinet should be larger than the basic drive envelope.

Additional space may be required for:

• Power cables
• Control cables
• Grounding conductors
• Terminal access
• Ventilation
• Maintenance
• Cooling
• Service replacement
• Cable bending radius
• Adjacent components
• Protective equipment

The 29.5 kg drive weight should also be considered when designing the mounting structure.

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40. Thermal Management

Thermal management is particularly important for a 270 A industrial drive.

The cabinet designer should consider:

• Continuous motor loading
• Ambient temperature
• Internal cabinet temperature
• Drive losses
• Airflow
• Cooling fans
• Cabinet filters
• Other heat-generating devices
• Installation altitude
• Regenerative operating cycles

A cabinet that is physically large enough may still be thermally unsuitable.

The heat generated by the drive and other components needs to be considered as part of the complete enclosure design.

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41. Power Wiring

The 20P41AE270RA0NNN is a high-current industrial drive.

Power wiring should therefore be engineered carefully.

The installation should consider:

• Incoming AC conductors
• Motor armature conductors
• Field conductors
• Grounding
• Protective devices
• Cable insulation
• Terminal torque
• Cable routing
• Separation of power and control wiring
• Cabinet grounding
• Electromagnetic compatibility

For a 270 A system, conductor sizing and protective-device coordination are particularly important.

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42. Feedback and Speed Control

Many industrial DC applications use feedback devices to improve speed regulation.

Depending on the machine, feedback may involve:

• Tachometer
• Encoder
• Speed feedback
• Current feedback
• Tension feedback
• Dancer feedback

The correct feedback arrangement should be determined from the original machine design.

When replacing an older DC drive, the existing feedback device should be identified before the new drive is installed.

This can prevent commissioning problems caused by incompatible feedback signals or incorrect scaling.

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43. Maintenance Considerations

The drive should be incorporated into a planned maintenance program.

Typical maintenance activities can include:

• Cabinet inspection
• Fan inspection
• Filter cleaning
• Terminal inspection
• Cable inspection
• Grounding inspection
• Electronic contamination inspection
• Motor brush inspection
• Commutator inspection
• Bearing inspection
• Field-circuit inspection
• Feedback-device inspection

The motor itself may require more frequent mechanical maintenance than a modern AC motor because traditional DC motors can include brushes and commutators.

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44. Spare Parts Management

For industrial facilities using PowerFlex DC equipment, the exact catalog number should be included in the spare-parts database.

A recommended record is:

Spare-Part Parameter	Information
Brand	Allen-Bradley
Series	PowerFlex DC
Catalog Number	20P41AE270RA0NNN
Voltage Class	575 V AC
Current	270 A
Motor Rating	200 HP
Motor Power	Approximately 149 kW
Configuration	Four Quadrant / Regenerative
Field Supply	Single Phase Regulated
Frame	B
Dimensions	311 × 388 × 350 mm
Drive Weight	29.5 kg
Packaged Weight	31.5 kg
Enclosure	IP20 / NEMA/UL Type Open
HIM	Blank Plate / No HIM
Communication	None standard

This information makes it easier for maintenance personnel and procurement teams to identify the correct equipment.

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45. Product Selection Checklist

Before ordering or replacing a 20P41AE270RA0NNN, check the following:

Electrical

• Is the incoming supply in the correct voltage class?
• Is the supply three phase?
• Is the transformer adequately sized?
• Are the protective devices appropriate?
• Is the motor armature voltage compatible?
• Is the motor armature current compatible?
• Is the field voltage compatible?
• Is the field current compatible?

Mechanical

• Is the motor mechanically healthy?
• Is the coupling in good condition?
• Is the gearbox suitable?
• Is the load inertia within the required operating range?
• Is the machine capable of handling the required acceleration and deceleration?

Control

• Is speed feedback required?
• Is a tachometer installed?
• Is an encoder installed?
• Is PLC control required?
• Is communication required?
• Is local keypad operation required?

Installation

• Is there enough cabinet space?
• Is there adequate airflow?
• Is the cabinet temperature acceptable?
• Are power cables correctly sized?
• Is grounding correctly designed?
• Is service access available?

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46. Product Advantages in Industrial Retrofit Projects

The 20P41AE270RA0NNN can offer several practical advantages in an existing industrial installation.

First, it provides a high 270 A current rating, allowing it to serve large DC motors.

Second, the 200 HP / approximately 149 kW capacity places it firmly in the large industrial machinery category.

Third, its four-quadrant regenerative configuration is particularly useful for applications involving repeated acceleration, deceleration, reversing, and high-inertia loads.

Fourth, the regulated field supply provides the necessary field-control functionality for compatible DC motor installations.

Fifth, the Frame B construction gives the drive an approximate 311 × 388 × 350 mm mechanical envelope, which can simplify comparison with existing cabinet space.

Finally, the product’s DC architecture can be attractive when the existing DC motor and mechanical system are still suitable for continued service.

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47. Practical Example – 200 HP Winding Machine

Consider a production line using a 200 HP DC motor to drive a large winding system.

At startup, the drive gradually increases armature current and motor torque.

As the machine approaches operating speed, the drive maintains the required speed according to the machine control system.

During production, the drive may respond continuously to changing tension and speed commands.

When the machine decelerates, the motor can enter regenerative operation.

The drive can then control the electrical energy associated with the decelerating rotating mass.

If the machine needs to reverse, the four-quadrant architecture provides the appropriate operating framework.

This is a typical example of why a high-current regenerative DC drive can be useful in industrial winding equipment.

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48. Practical Example – Large Roll Drive

A large roll can contain substantial stored rotational energy.

During acceleration, the drive must provide sufficient torque to overcome the inertia of the roll.

During deceleration, the same inertia produces regenerative energy.

A 270 A four-quadrant drive can be used as part of a system designed to control these transitions.

The complete machine should still include suitable safety devices and mechanical braking where required.

The regenerative function should not be treated as a replacement for every safety-related braking function.

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49. Practical Example – Existing Production Line

An older production line may contain:

• 200 HP DC motor
• Existing gearbox
• Existing coupling
• Tachometer
• Existing cabinet
• PLC control
• Analog speed reference
• Production interlocks

If the mechanical components remain in good condition, a DC drive modernization can potentially avoid a complete mechanical conversion.

The 20P41AE270RA0NNN can be evaluated as the drive component in such a modernization project.

The final selection should be based on the actual motor and machine data.

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50. Related Model Selection Guide

Application Size	Suggested PowerFlex DC Model	Current	Motor Rating	Approx. Weight
Smaller industrial DC motor	20P41AE067RA0NNN	67.5 A	50 HP / 37 kW	25.5 kg
Medium DC motor	20P41AE101RA0NNN	101.3 A	75 HP / 56 kW	25.5 kg
100 HP class	20P41AE135RA0NNN	135 A	100 HP / 75 kW	25.5 kg
200 HP class	20P41AE270RA0NNN	270 A	200 HP / 149 kW	29.5 kg
300 HP class	20P41AE405RA0NNN	405 A	300 HP / 224 kW	32 kg

The models in this table are intended for comparison within the same 575 V regenerative PowerFlex DC family.

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51. Mechanical Comparison

Model / Catalog Number	Frame	Height	Width	Depth	Drive Weight
20P41AE067RA0NNN	B	311 mm	388 mm	350 mm	25.5 kg
20P41AE101RA0NNN	B	311 mm	388 mm	350 mm	25.5 kg
20P41AE135RA0NNN	B	311 mm	388 mm	350 mm	25.5 kg
20P41AE270RA0NNN	B	311 mm	388 mm	350 mm	29.5 kg
20P41AE405RA0NNN	B	311 mm	388 mm	350 mm	32 kg

The Frame B dimensional envelope is approximately 311 × 388 × 350 mm. The weight changes according to the current-rating group.

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52. Electrical Comparison

Model / Catalog Number	Voltage Class	Current	HP	kW	Operation
20P41AE067RA0NNN	575 V AC	67.5 A	50 HP	37 kW	Four Quadrant / Regenerative
20P41AE101RA0NNN	575 V AC	101.3 A	75 HP	56 kW	Four Quadrant / Regenerative
20P41AE135RA0NNN	575 V AC	135 A	100 HP	75 kW	Four Quadrant / Regenerative
20P41AE270RA0NNN	575 V AC	270 A	200 HP	149 kW	Four Quadrant / Regenerative
20P41AE405RA0NNN	575 V AC	405 A	300 HP	224 kW	Four Quadrant / Regenerative

The 270 A model represents a significant increase in current and motor capacity over the 135 A model.

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53. Same-Brand Popular Model Comparison

Model / Catalog Number	Series	Type	Voltage	Current	Power	Dimensions	Weight
25B-D010N114	PowerFlex 525	AC Drive	380…480 V AC	10.5 A	5 HP / 4 kW	Configuration-dependent	Configuration-dependent
25B-D017N114	PowerFlex 525	AC Drive	380…480 V AC	17 A class	10 HP / 7.5 kW	Configuration-dependent	Approx. 3.03 kg
25B-D030N114	PowerFlex 525	AC Drive	380…480 V AC	30 A	20 HP / 15 kW	Configuration-dependent	Configuration-dependent
20G11ND077AA0NNNNN	PowerFlex 755	AC Drive	480 V AC class	77 A class	50 HP class	Configuration-dependent	Configuration-dependent
20G11ND156AA0NNNNN	PowerFlex 755	AC Drive	480 V AC / 650 V DC	156 A	125 HP / 93 kW	Configuration-dependent	Approx. 68.04 kg

These products are included as related same-brand drive products.

They are not direct catalog replacements for the 20P41AE270RA0NNN because they belong to AC drive families rather than the PowerFlex DC regenerative family.

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54. Important Selection Difference

The most important distinction when comparing the 20P41AE270RA0NNN with AC drive products is the motor technology.

The 20P41AE270RA0NNN is designed for DC motor control.

A PowerFlex 525 or PowerFlex 755 AC drive is designed for AC motor control.

Therefore, replacing a 200 HP DC drive with an AC drive is normally a system-engineering project rather than a simple catalog-number substitution.

Such a conversion may require:

• New AC motor
• New coupling
• Mechanical mounting modifications
• Possible gearbox changes
• New feedback arrangement
• Different braking system
• New motor cables
• Revised PLC programming
• Revised control logic
• Cabinet modifications

For an existing DC machine, retaining the DC motor can sometimes reduce the scope of mechanical changes.

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55. Overall Technical Summary

The Allen-Bradley 20P41AE270RA0NNN is a high-power PowerFlex DC regenerative drive designed for industrial applications requiring substantial DC motor control capability.

Its principal ratings are:

575 V AC class

Three-phase input

Six-pulse configuration

270 A current

200 HP / approximately 149 kW normal-duty rating

Four-quadrant regenerative operation

Single-phase regulated field supply

Frame B

IP20 / NEMA/UL Type Open

Conformal coating

No HIM / blank plate

No standard communication module

The approximate mechanical dimensions are 311 × 388 × 350 mm, with an approximate drive weight of 29.5 kg and an approximate packaged weight of 31.5 kg.

The product is particularly suited to applications involving large DC motors, high inertia, frequent acceleration and deceleration, reversing, tension control, winding, unwinding, paper processing, converting, metal processing, large conveyors, and industrial DC drive modernization.

Within the same PowerFlex DC family, the 20P41AE067RA0NNN, 20P41AE101RA0NNN, 20P41AE135RA0NNN, 20P41AE270RA0NNN, and 20P41AE405RA0NNN provide a useful range of current and motor-power ratings.

The 270 A model is positioned in the 200 HP / approximately 149 kW class and is therefore substantially larger than the 50 HP, 75 HP, and 100 HP models while remaining below the 300 HP / 405 A model.

For applications with a healthy existing 200 HP DC motor, the 20P41AE270RA0NNN can be evaluated as a drive-modernization component.

For new machinery or complete motor-conversion projects, related AC drive families can also be considered, but the motor technology, mechanical system, braking method, feedback, control system, and cabinet design must all be reviewed before selecting an AC alternative.

Overall, the key characteristics of the 20P41AE270RA0NNN are its 270 A current capacity, 200 HP motor rating, 575 V three-phase input, four-quadrant regenerative operation, regulated field supply, and Frame B industrial construction.

These characteristics make it a high-capacity solution for demanding DC motor applications where controlled acceleration, deceleration, reversing, speed regulation, and regenerative operation are important.