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1. Product Overview

The Allen-Bradley 20P41AF565RA0NNN is a high-power regenerative DC drive in the PowerFlex DC product family. It is designed for large industrial DC motors that require substantial armature current, controlled acceleration and deceleration, reversing capability, and four-quadrant regenerative operation.

This model has a 565 A DC output rating and belongs to the 500 HP / 373 kW power class for the 690 V AC, three-phase PowerFlex DC range. It uses a six-pulse input configuration, four-quadrant regenerative motor operation, a regulated single-phase field supply, an IP20 / NEMA/UL Type Open enclosure, and conformal coating. The standard configuration is supplied without a HIM and without a standard communication module.

The 20P41AF565RA0NNN is intended for demanding industrial machinery rather than small general-purpose motor applications. Its 565 A rating places it in the high-current section of the PowerFlex DC family, making it suitable for large DC motors used in heavy production equipment.

The model is also a particularly useful configuration for installations that require regenerative braking and four-quadrant control. During normal operation the drive can deliver controlled power to the motor, while during suitable braking conditions the motor can operate regeneratively and return energy through the regenerative power-conversion system.

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2. Brand and Product Series

Item	Description
Brand	Allen-Bradley
Product Family	PowerFlex DC
Product Series	PowerFlex Digital DC Drive
Model / Catalog Number	20P41AF565RA0NNN
Drive Type	Regenerative DC Drive
Voltage Class	690 V AC
Input	Three-phase AC
Input Type	6 Pulse
DC Output Current	565 A
Motor Power Class	500 HP
Motor Power Class	373 kW
Motor Operation	Four-quadrant regenerative
Frame Size	C
Enclosure	IP20, NEMA/UL Type Open
Conformal Coating	Yes
HIM	No HIM / Blank Plate
Standard Communication Module	None
Field Supply	Single-phase regulated
Typical Motor Type	Industrial DC Motor
Typical Application	Large industrial machinery

The catalog information identifies the 20P41AF565RA0NNN as a 690 VAC, three-phase, 565 A, 500 HP PowerFlex DC Drive. The technical data places the 565 A regenerative model in Frame C.

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3. Main Technical Parameters

Parameter	Specification
Model / Catalog Number	20P41AF565RA0NNN
Brand	Allen-Bradley
Product Family	PowerFlex DC
Drive Type	Regenerative DC Drive
Input Voltage	690 V AC class
Input Phase	3 Phase
Input Type	6 Pulse
DC Output Current	565 A
Motor Power	500 HP
Motor Power	373 kW
Motor Operation	Four Quadrant / Regenerative
Frame Size	C
Enclosure	IP20
Enclosure Classification	NEMA/UL Type Open
Conformal Coating	Yes
HIM	No HIM / Blank Plate
Standard Communication Module	None
Field Supply	Single-Phase Regulated
Factory Feedback	Encoder and DC analog tachometer input
Approx. Overall Height	521 mm
Approx. Overall Width	511 mm
Approx. Overall Depth	416 mm
Approx. Drive Weight	72 kg
Approx. Packaged Weight	94 kg

The technical data identifies the 690 V AC regenerative family as 400 HP / 452 A, 500 HP / 565 A, 600 HP / 678 A, 700 HP / 791 A, and higher configurations. The 565 A model is therefore the 500 HP / 373 kW Frame C regenerative configuration in this family.

The Frame C mechanical data gives an approximate overall envelope of 521 mm × 511 mm × 416 mm. The corresponding regenerative Frame C weight for the 565 A rating is approximately 72 kg, with approximately 94 kg for the drive and packaging.

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4. Dimensions and Weight

Mechanical installation is an important consideration for the 20P41AF565RA0NNN because the product uses the larger Frame C platform.

Mechanical Parameter	Specification
Model	20P41AF565RA0NNN
Frame	C
Overall Height	521 mm
Overall Height	20.5 in
Overall Width	511 mm
Overall Width	20.1 in
Overall Depth	416 mm
Overall Depth	16.4 in
A1 Dimension	499 mm
B1 Dimension	400 mm
B2 Dimension	200 mm
B3 Dimension	55 mm
B4 Dimension	56 mm
B5 Dimension	10.5 mm
Drive Weight	72 kg
Packaged Weight	94 kg

The Frame C dimensional drawing identifies the principal dimensions as approximately 521 mm height, 511 mm width, and 416 mm depth. The published Frame C weight data identifies the 565 A regenerative configuration at approximately 72 kg, with approximately 94 kg including packaging.

These figures describe the drive itself and should not be interpreted as the complete finished cabinet dimensions.

A finished installation normally needs additional room for power terminals, cable bending radius, ventilation, grounding, control wiring, feedback wiring, maintenance access, and electrical clearances.

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5. 690 V AC Three-Phase Product Class

One of the key characteristics of the 20P41AF565RA0NNN is that it belongs to the 690 V AC three-phase PowerFlex DC family.

This differentiates it from the 575 V AC-class models such as the 20P41AE540RA0NNN and 20P41AE675RA0NNN.

The AF configuration is intended for the higher-voltage 690 V AC class, with the 565 A model corresponding to approximately 500 HP / 373 kW.

Product	Voltage Class	Current	Motor Power	Frame
20P41AE540RA0NNN	575 V AC class	540 A	400 HP / 298 kW	C
20P41AE675RA0NNN	575 V AC class	675 A	500 HP / 373 kW	C
20P41AF452RA0NNN	690 V AC class	452 A	400 HP / 298 kW	C
20P41AF565RA0NNN	690 V AC class	565 A	500 HP / 373 kW	C
20P41AF678RA0NNN	690 V AC class	678 A	600 HP / 447 kW	D

The 690 V family selection table places the 565 A configuration directly in the 500 HP / 373 kW class and identifies it as Frame C.

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6. 500 HP / 373 kW Power Class

The 20P41AF565RA0NNN belongs to the 500 HP / 373 kW motor power class.

This is a substantial industrial motor rating.

A drive in this range is normally used for large machinery where the motor must deliver high torque and maintain controlled speed under demanding production conditions.

The 373 kW rating places the model between the 400 HP / 298 kW and 600 HP / 447 kW configurations in the 690 V regenerative DC family.

This gives users a useful range of neighboring models when selecting a drive according to actual motor current and machine requirements.

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7. 565 A Current Rating

The 565 A DC output rating is one of the defining characteristics of this model.

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

Consequently, the drive’s current rating is one of the primary factors used to determine whether it can support a particular motor.

A 565 A drive can therefore be considered for large DC motors requiring substantial armature current.

However, the final selection should not be based on current alone.

The following should also be checked:

• Armature voltage.
• Motor nameplate current.
• Motor power.
• Motor field voltage.
• Motor field current.
• Base speed.
• Maximum speed.
• Duty cycle.
• Acceleration time.
• Deceleration time.
• Overload requirements.
• Feedback device.
• Ambient temperature.
• Cooling method.

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8. Four-Quadrant Regenerative Operation

The 20P41AF565RA0NNN is a four-quadrant regenerative drive.

This is one of its most important functional characteristics.

Four-quadrant operation allows the motor-control system to handle both directions of rotation and both motoring and regenerative conditions.

The four basic operating conditions can be represented as:

Quadrant	Operating Condition
Quadrant I	Forward Motoring
Quadrant II	Forward Regenerative Braking
Quadrant III	Reverse Motoring
Quadrant IV	Reverse Regenerative Braking

This architecture is particularly useful for machinery that needs frequent direction changes or controlled deceleration.

The product’s specifications identify its motor operation as Four Quadrant ops – Regen.

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9. Regenerative Braking

Regenerative braking is especially useful when a machine contains substantial mechanical inertia.

During acceleration, electrical energy is delivered to the motor.

During deceleration, the rotating mechanical system can drive the motor.

At this point, the motor can act as a generator.

The regenerative drive controls the electrical energy associated with this process and allows suitable regenerative energy to flow back through the power-conversion system.

This operating characteristic can be useful in:

• Large winding machines.
• Unwinding machines.
• Roll drives.
• Reversing machinery.
• Large conveyors.
• High-inertia equipment.
• Material-processing machinery.
• Heavy industrial production lines.

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10. Six-Pulse Input

The 20P41AF565RA0NNN uses a six-pulse input configuration.

Six-pulse power conversion is a conventional architecture used in industrial DC drives.

The three-phase AC input is processed by the power-conversion section to provide controlled DC power for the motor.

For a 565 A high-power installation, the incoming electrical system should be designed carefully.

Important considerations include:

• Transformer capacity.
• Input voltage.
• Short-circuit current.
• Protective devices.
• Line impedance.
• Cable sizing.
• Grounding.
• Line reactors.
• Harmonic considerations.
• Switching equipment.

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11. Regulated Field Supply

The model includes a single-phase regulated field supply.

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

The field establishes the magnetic flux required for normal motor operation.

Before installation or replacement, the motor’s field requirements should be checked.

Field Parameter	Required Verification
Field Voltage	Match motor requirements
Field Current	Match motor requirements
Field Type	Confirm motor configuration
Field Protection	Confirm required protection
Field Loss Detection	Confirm machine requirements
Field Wiring	Verify existing connections
Field Regulation	Confirm required operating range

The product specification identifies the field supply as single-phase regulated.

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12. Frame C Construction

The 20P41AF565RA0NNN uses Frame C.

This is consistent with the 690 V regenerative family’s 400 HP and 500 HP configurations.

The next higher 600 HP / 678 A model moves into Frame D.

Model	Current	Motor Power	Frame
20P41AF452RA0NNN	452 A	400 HP / 298 kW	C
20P41AF565RA0NNN	565 A	500 HP / 373 kW	C
20P41AF678RA0NNN	678 A	600 HP / 447 kW	D
20P41AF791RA0NNN	791 A	700 HP / 552 kW	D
20P41AF904RA0NNN	904 A	800 HP / 597 kW	D

The frame assignments are documented in the PowerFlex DC technical data for the 690 V AC three-phase product range.

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13. IP20 / NEMA/UL Type Open Enclosure

The 20P41AF565RA0NNN uses an IP20, NEMA/UL Type Open enclosure.

This means the drive is intended to be installed as part of a suitable electrical cabinet or control enclosure.

It is not intended to be treated as a standalone outdoor enclosure.

The cabinet should protect the drive from environmental conditions such as:

• Direct water.
• Excessive dust.
• Conductive particles.
• Mechanical impact.
• Oil contamination.
• Corrosive substances.

The cabinet should also provide adequate thermal management.

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14. Conformal Coating

The product configuration includes conformal coating.

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

This can be useful where the equipment may be exposed to increased humidity or contamination compared with a clean indoor electrical room.

However, conformal coating does not eliminate the need for a suitable enclosure.

The complete installation must still meet the environmental requirements of the drive and application.

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15. No HIM / Blank Plate Configuration

The standard catalog configuration is supplied with No HIM / Blank Plate.

HIM refers to the Human Interface Module used for local drive interaction.

A blank-plate configuration can be suitable for machines where the drive is installed inside a centralized control cabinet and controlled through a separate automation system.

Typical external control arrangements can include:

• PLC control.
• Digital inputs.
• Analog speed reference.
• External operator panel.
• Network control.
• Machine sequencing logic.

This arrangement can be useful for OEM machinery and centralized production systems.

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16. Communication Configuration

The 20P41AF565RA0NNN is specified with None-Standard communications.

This means the standard catalog configuration does not include a standard communication module.

The complete automation architecture should therefore be considered separately.

For an existing machine, it is useful to document:

• PLC model.
• Existing network.
• Hardwired control signals.
• Analog references.
• Digital inputs.
• Digital outputs.
• Feedback signals.
• Operator interface.
• Drive-to-PLC communication requirements.

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17. Factory Feedback Capability

The PowerFlex DC technical data indicates that each PowerFlex DC drive includes an encoder input and DC analog tachometer input.

This is particularly relevant for applications where accurate speed regulation is required.

A feedback system can provide the drive with information about actual motor speed.

This allows the control system to compare commanded speed with actual speed and adjust motor operation accordingly.

For retrofit projects, the existing tachometer or encoder should be identified before finalizing the drive configuration.

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18. Product Applications

The 20P41AF565RA0NNN is suitable for evaluation in a wide range of high-power industrial DC motor applications.

Typical application areas include:

• Large winding machines.
• Unwinding machines.
• Paper-processing machinery.
• Printing machinery.
• Converting machinery.
• Steel-processing equipment.
• Metal-processing machinery.
• Large conveyors.
• High-inertia machinery.
• Reversing machinery.
• Large roll drives.
• Material-handling equipment.
• Heavy production machinery.
• Industrial test stands.
• Existing 500 HP DC motor systems.

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19. Winding Machine Applications

Large winding machines often require substantial torque and controlled speed.

The machine may need to accelerate a large roll from standstill to production speed.

Once operating speed is reached, the drive maintains the required motor torque and speed.

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

The four-quadrant architecture allows the drive to manage this transition.

If the machine also needs reverse operation, the drive can control the motor through braking and into reverse motoring.

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20. Unwinding Applications

Unwinding systems can be particularly demanding because the material roll can drive the motor.

In some operating conditions, the motor needs to provide braking torque rather than driving torque.

This places the motor into a regenerative condition.

The 20P41AF565RA0NNN provides the four-quadrant architecture needed for this type of operation.

For large unwind stands, the 565 A rating can provide the current capacity required by a large DC motor.

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21. Paper and Converting Machinery

Paper-processing machinery can contain large rolls, drums, and rotating sections.

The machine may require stable speed regulation while the mechanical load changes.

During acceleration and deceleration, motor torque may change significantly.

A regenerative DC drive can be useful when the machine repeatedly moves between motoring and regenerative conditions.

The 500 HP / 373 kW class makes this model suitable for large versions of this type of equipment.

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22. Steel and Metal Processing

Large steel and metal-processing machines can require high torque and rapid changes in motor operating conditions.

The machine may need:

• High starting torque.
• Stable production speed.
• Controlled acceleration.
• Controlled deceleration.
• Reversing.
• Regenerative braking.

The 565 A current capacity provides a substantial electrical capability for large DC motor systems.

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23. Large Conveyor Systems

Large conveyors can contain significant mechanical mass.

The motor must accelerate the belt, rollers, gearbox, and product load.

During deceleration, the stored mechanical energy can drive the motor.

A regenerative drive can control this energy flow.

The actual suitability depends on conveyor size, speed, motor rating, load profile, acceleration time, braking requirements, and mechanical inertia.

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24. High-Inertia Machinery

High-inertia machinery is an important application category for regenerative drives.

Examples include:

• Large rolls.
• Flywheels.
• Drums.
• Large rotating processing equipment.
• Heavy conveyors.
• Large fans.
• Industrial winding equipment.

When these systems decelerate, the stored mechanical energy must be controlled.

The regenerative architecture of the 20P41AF565RA0NNN is designed around this type of bidirectional energy flow.

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25. Reversing Machinery

Four-quadrant operation is particularly useful for machines that repeatedly change direction.

A typical sequence can be:

Forward Motoring → Regenerative Braking → Zero Speed → Reverse Motoring.

The machine can then reverse the sequence when changing back to forward operation.

This type of control can help provide controlled torque during direction changes.

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26. DC Motor Retrofit Applications

The 20P41AF565RA0NNN can also be considered for modernization of an existing high-power DC motor installation.

An older machine may still have a mechanically sound 500 HP DC motor while the existing drive has become outdated.

Replacing only the drive can sometimes be less mechanically disruptive than converting the entire machine to an AC motor system.

A retrofit project should nevertheless examine:

• Motor armature voltage.
• Armature current.
• Motor field voltage.
• Field current.
• Tachometer.
• Encoder.
• Motor cooling.
• Motor insulation.
• Cable condition.
• Cabinet dimensions.
• Transformer capacity.
• Protective equipment.
• Control system.
• Regenerative requirements.

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27. Main Product Advantages

High 565 A Current Capacity

The 565 A output rating provides substantial current capability for large DC motors.

This makes the model appropriate for high-power industrial machinery.

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500 HP / 373 kW Class

The 500 HP / 373 kW rating places the model in the heavy industrial section of the PowerFlex DC family.

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Four-Quadrant Regenerative Operation

The drive can operate in forward and reverse motoring as well as regenerative braking conditions.

This is useful for machinery requiring controlled reversing and braking.

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690 V AC Class

The model belongs to the 690 V AC three-phase drive family, making it suitable for the corresponding high-voltage industrial power systems.

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Regulated Field Supply

The integrated regulated field supply supports conventional DC motor field-control requirements.

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Frame C Construction

The Frame C platform provides a physical and thermal platform suitable for the 565 A high-power configuration.

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Conformal Coating

The conformal coating provides additional protection to electronic assemblies in suitable industrial environments.

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Factory Feedback Inputs

The PowerFlex DC platform includes encoder and DC analog tachometer input capability, supporting speed-feedback applications.

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28. Five Recommended Same-Series or Closely Related Models

The following models are closely related 690 V AC PowerFlex DC regenerative configurations.

Model	Voltage Class	Current	Motor HP	Motor kW	Operation	Frame	Approx. Dimensions	Weight
20P41AF452RA0NNN	690 V AC	452 A	400 HP	298 kW	4-Quadrant Regenerative	C	521 × 511 × 416 mm	72 kg
20P41AF565RA0NNN	690 V AC	565 A	500 HP	373 kW	4-Quadrant Regenerative	C	521 × 511 × 416 mm	72 kg
20P41AF678RA0NNN	690 V AC	678 A	600 HP	447 kW	4-Quadrant Regenerative	D	Configuration-dependent	Configuration-dependent
20P41AF791RA0NNN	690 V AC	791 A	700 HP	552 kW	4-Quadrant Regenerative	D	Configuration-dependent	Configuration-dependent
20P41AF904RA0NNN	690 V AC	904 A	800 HP	597 kW	4-Quadrant Regenerative	D	Configuration-dependent	Configuration-dependent

The 690 V AC regenerative family identifies 452 A as the 400 HP model, 565 A as the 500 HP model, 678 A as the 600 HP model, 791 A as the 700 HP model, and 904 A as the 800 HP model.

The Frame C mechanical dimensions and weight apply to the 452 A and 565 A configurations in this group. The higher-current Frame D configurations require their individual mechanical drawings for exact installation dimensions and weight.

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29. Same-Series Electrical Comparison

Model	Current	Motor Power	Motor Power	Frame	Regenerative
20P41AF452RA0NNN	452 A	400 HP	298 kW	C	Yes
20P41AF565RA0NNN	565 A	500 HP	373 kW	C	Yes
20P41AF678RA0NNN	678 A	600 HP	447 kW	D	Yes
20P41AF791RA0NNN	791 A	700 HP	552 kW	D	Yes
20P41AF904RA0NNN	904 A	800 HP	597 kW	D	Yes

The progression is useful when matching the drive to the motor’s actual current and power requirements.

The change from 565 A to 678 A also changes the mechanical frame from C to D, so cabinet space must be checked whenever moving into the higher-current range.

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30. Mechanical Comparison of the Main 690 V Models

Model	Frame	Height	Width	Depth	Drive Weight
20P41AF452RA0NNN	C	521 mm	511 mm	416 mm	72 kg
20P41AF565RA0NNN	C	521 mm	511 mm	416 mm	72 kg
20P41AF678RA0NNN	D	Configuration-dependent	Configuration-dependent	Configuration-dependent	Configuration-dependent
20P41AF791RA0NNN	D	Configuration-dependent	Configuration-dependent	Configuration-dependent	Configuration-dependent
20P41AF904RA0NNN	D	Configuration-dependent	Configuration-dependent	Configuration-dependent	Configuration-dependent

The Frame C dimensional data is approximately 521 × 511 × 416 mm, and the regenerative Frame C weight for the 565 A rating is approximately 72 kg.

For Frame D products, the exact mechanical dimensions should be taken from the particular catalog configuration rather than estimated from the Frame C dimensions.

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31. Five Same-Brand Related Models

The following models are related Allen-Bradley products that may be considered when comparing DC-drive configurations or evaluating broader motor-control modernization options.

They are not all direct electrical replacements for the 20P41AF565RA0NNN.

Model	Product Family	Drive Type	Voltage / Rating Class	Current / Power	Approx. Dimensions	Weight
20P21AF565RA0NNN	PowerFlex DC	Non-Regenerative DC Drive	690 V AC	565 A / 500 HP / 373 kW	521 × 511 × 416 mm	68 kg
20P41AF452RA0NNN	PowerFlex DC	Regenerative DC Drive	690 V AC	452 A / 400 HP / 298 kW	521 × 511 × 416 mm	72 kg
20P41AF678RA0NNN	PowerFlex DC	Regenerative DC Drive	690 V AC	678 A / 600 HP / 447 kW	Frame D / configuration-dependent	Configuration-dependent
20P41AE675RA0NNN	PowerFlex DC	Regenerative DC Drive	575 V AC class	675 A / 500 HP / 373 kW	521 × 511 × 416 mm	72 kg
25B-D010N114	PowerFlex 525	AC Drive	380…480 V AC	10.5 A / 5 HP / 4 kW	228.09 × 139.95 × 239.01 mm	2.193 kg

The 20P21AF565RA0NNN is the closely related non-regenerative 565 A / 500 HP configuration. The 20P41AF452RA0NNN and 20P41AF678RA0NNN are adjacent regenerative models in the same 690 V family. The 20P41AE675RA0NNN is a 575 V-class regenerative model with the same approximate 500 HP power class but a different voltage class. The PowerFlex 525 model is an example of a much smaller AC-drive product and should be regarded as a broader related product rather than a direct substitute.

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32. 20P41AF565RA0NNN Versus 20P21AF565RA0NNN

The 20P21AF565RA0NNN is the closely related non-regenerative version of the same 690 V / 565 A / 500 HP power class.

Parameter	Regenerative Model	Non-Regenerative Model
Model	20P41AF565RA0NNN	20P21AF565RA0NNN
Voltage Class	690 V AC	690 V AC
Current	565 A	565 A
Motor Power	500 HP	500 HP
Motor Power	373 kW	373 kW
Frame	C	C
Operation	Four Quadrant / Regenerative	Two Quadrant
Approx. Dimensions	521 × 511 × 416 mm	521 × 511 × 416 mm
Drive Weight	72 kg	68 kg
Packaged Weight	94 kg	Approximately 90 kg
Field Supply	Single-Phase Regulated	Single-Phase Regulated
Enclosure	IP20 / NEMA/UL Type Open	IP20 / NEMA/UL Type Open

The principal difference is the operating architecture: the 20P41 model is the regenerative four-quadrant configuration, while the 20P21 model is the two-quadrant non-regenerative configuration.

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33. 20P41AF565RA0NNN Versus 20P41AF452RA0NNN

The 452 A model is the closest lower-current configuration in the 690 V regenerative family.

Parameter	452 A Model	565 A Model
Model	20P41AF452RA0NNN	20P41AF565RA0NNN
Voltage	690 V AC	690 V AC
Current	452 A	565 A
Motor Power	400 HP	500 HP
Motor Power	298 kW	373 kW
Frame	C	C
Regenerative	Yes	Yes
Four Quadrant	Yes	Yes
Height	521 mm	521 mm
Width	511 mm	511 mm
Depth	416 mm	416 mm
Drive Weight	72 kg	72 kg

Both models use the Frame C platform and the same main mechanical envelope.

The primary difference is their electrical capacity and corresponding motor power class.

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34. 20P41AF565RA0NNN Versus 20P41AF678RA0NNN

The 678 A model is the next higher current class in the 690 V regenerative family.

Parameter	565 A Model	678 A Model
Model	20P41AF565RA0NNN	20P41AF678RA0NNN
Voltage	690 V AC	690 V AC
Current	565 A	678 A
Motor Power	500 HP	600 HP
Motor Power	373 kW	447 kW
Frame	C	D
Regenerative	Yes	Yes
Four Quadrant	Yes	Yes
Dimensions	521 × 511 × 416 mm	Frame D / configuration-dependent
Weight	72 kg	Configuration-dependent

The transition to the 678 A model also represents a transition from Frame C to Frame D.

This can have a significant effect on cabinet layout and installation requirements.

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35. 690 V AC Versus 575 V AC Models

The 20P41AF565RA0NNN and 20P41AE675RA0NNN have similar nominal motor power, but they belong to different voltage classes.

Parameter	690 V Class	575 V Class
Model	20P41AF565RA0NNN	20P41AE675RA0NNN
Voltage Class	690 V AC	575 V AC class
Current	565 A	675 A
Motor Power	500 HP	500 HP
Motor Power	373 kW	373 kW
Frame	C	C
Operation	Regenerative	Regenerative
Input	3 Phase	3 Phase
Input Type	6 Pulse	6 Pulse
Dimensions	521 × 511 × 416 mm	521 × 511 × 416 mm
Drive Weight	72 kg	72 kg

Although both models are in the 500 HP / 373 kW class, their voltage classes are different.

The drive must therefore be selected according to the actual electrical system and motor requirements rather than by horsepower alone.

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36. Cabinet Design Considerations

The physical dimensions of the 20P41AF565RA0NNN are approximately 521 × 511 × 416 mm.

However, these dimensions do not represent the minimum finished cabinet dimensions.

Additional space is generally required for:

• Input power cables.
• Motor cables.
• Field wiring.
• Control wiring.
• Feedback wiring.
• Grounding conductors.
• Terminal access.
• Cooling.
• Air circulation.
• Maintenance.
• Cable bending radius.
• Electrical clearances.
• Protective equipment.
• Line reactors.

A cabinet designer should therefore start with the drive mechanical drawing and then build the complete enclosure around the electrical installation requirements.

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37. Thermal Management

A 565 A drive can generate significant heat during operation.

Thermal management is therefore an important engineering consideration.

The cabinet design may require:

• Forced ventilation.
• External cooling.
• Heat exchangers.
• Air conditioning.
• Controlled electrical-room temperature.
• Separation from other heat-producing equipment.

The actual heat-loss value should be obtained from the applicable technical data for the operating condition.

The technical data identifies approximately 2,300 W total loss for the 565 A Frame C drive configuration in the relevant table.

This is useful for preliminary cabinet thermal calculations, although the final design should use the appropriate detailed engineering values for the actual installation.

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38. Power Wiring

The 20P41AF565RA0NNN is a high-current industrial drive, so power wiring requires careful design.

The installation should consider:

• AC input voltage.
• AC input current.
• Motor armature current.
• Field current.
• Cable cross-section.
• Cable insulation.
• Cable temperature rating.
• Cable installation method.
• Cable length.
• Short-circuit rating.
• Protective devices.
• Terminal capacity.
• Grounding.

The applicable electrical standards for the installation should also be followed.

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39. Motor Compatibility

The drive should be matched to the actual DC motor.

Motor Parameter	Required Check
Armature Voltage	Verify against drive system
Armature Current	Verify against 565 A rating
Motor Power	Approximately 500 HP class
Motor Field Voltage	Verify
Motor Field Current	Verify
Base Speed	Verify
Maximum Speed	Verify
Motor Cooling	Verify
Feedback Type	Verify
Feedback Voltage	Verify
Duty Cycle	Verify
Overload Requirement	Verify
Regenerative Duty	Verify
Direction of Rotation	Verify

A 565 A rating should not be treated as sufficient evidence of compatibility by itself.

The complete motor nameplate and application duty must be evaluated.

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40. Feedback and Speed Regulation

For high-power industrial DC motors, speed feedback can be an important part of the control system.

The PowerFlex DC platform includes an encoder and DC analog tachometer input capability.

This provides flexibility for machines that require feedback-based speed regulation.

During a retrofit, the existing feedback device should be identified before removing the old drive.

Important information includes:

• Tachometer voltage.
• Tachometer polarity.
• Encoder type.
• Encoder supply voltage.
• Pulses per revolution.
• Wiring method.
• Shielding.
• Grounding.
• Existing scaling.

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41. Maintenance Considerations

A high-power DC drive should be included in a planned maintenance program.

Typical maintenance tasks can include:

• Inspecting ventilation openings.
• Cleaning accumulated contamination.
• Checking power connections.
• Inspecting control wiring.
• Inspecting feedback wiring.
• Checking grounding.
• Reviewing fault history.
• Checking cooling equipment.
• Inspecting field wiring.
• Checking motor connections.
• Inspecting cabinet temperature.
• Checking protective devices.

The maintenance interval should be adapted to the actual environment.

Heavy industrial environments may require more frequent inspection than clean electrical rooms.

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42. Spare Parts Planning

For a large production machine, spare-parts planning can be an important part of reliability management.

Potential spare categories can include:

• Control electronics.
• Power components.
• Cooling components.
• Feedback components.
• Interface components.
• Fuses.
• Contactors.
• Relays.
• Auxiliary power components.
• Communication components where applicable.

The exact spare-parts list should be based on the complete machine configuration.

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43. Product Selection Checklist

Selection Item	Specification
Catalog Number	20P41AF565RA0NNN
Brand	Allen-Bradley
Series	PowerFlex DC
Drive Type	Regenerative DC Drive
Voltage Class	690 V AC
Input Phase	Three-phase
Input Type	6 Pulse
Output Current	565 A
Motor Rating	500 HP
Motor Rating	373 kW
Operation	Four-Quadrant Regenerative
Frame	C
Enclosure	IP20 / NEMA/UL Type Open
Conformal Coating	Yes
HIM	No HIM / Blank Plate
Communication	None-Standard
Field Supply	Single-Phase Regulated
Feedback	Encoder and DC analog tachometer input
Height	521 mm
Width	511 mm
Depth	416 mm
Drive Weight	72 kg
Packaged Weight	94 kg
Approx. Drive Loss	2,300 W
Typical Application	Large industrial DC motor

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44. Practical Application Example – 500 HP Winding Machine

Consider a large winding machine equipped with a 500 HP DC motor.

At startup, the drive supplies controlled armature current to accelerate the motor.

As the machine reaches operating speed, the drive regulates the motor according to the production process.

When the machine decelerates, the mechanical energy stored in the roll can return through the motor.

The motor then enters regenerative operation.

The drive manages this energy flow and controls the braking torque.

If the machine subsequently reverses, the drive can transition through regenerative braking and then into reverse motoring.

This is a strong example of why a four-quadrant regenerative architecture can be useful in high-power machinery.

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45. Practical Application Example – Large Roll Processing

A large roll can contain considerable rotational inertia.

During acceleration, the motor must deliver high torque.

During deceleration, the rotating roll can drive the motor.

The regenerative drive then manages the resulting energy flow.

The 565 A rating provides a substantial current capability for large DC motors in this type of application.

The actual drive selection should still be based on motor nameplate current, voltage, speed, duty cycle, and machine inertia.

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46. Practical Application Example – Reversing Machine

A large reversing machine may repeatedly change direction.

The operating sequence could be:

Forward Motoring → Controlled Deceleration → Regenerative Braking → Zero Speed → Reverse Motoring.

The machine may then return to forward operation using the reverse sequence.

This type of application benefits from a drive capable of controlling both torque direction and energy flow.

The four-quadrant design of the 20P41AF565RA0NNN is intended for this type of operating requirement.

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47. Practical Application Example – Heavy Conveyor

Consider a large industrial conveyor with a heavy material load.

During startup, the motor must accelerate both the conveyor and the transported material.

Once operating speed is reached, the drive maintains the required speed.

During controlled stopping, the mechanical system can return energy to the motor.

The regenerative drive can manage this braking condition.

The actual suitability depends on conveyor speed, belt mass, material load, gearbox ratio, motor rating, and braking requirements.

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48. Practical Application Example – Existing DC Motor Retrofit

A factory may have a large DC motor that is mechanically integrated into a production machine.

The motor, gearbox, shaft, coupling, and mechanical system may still be usable while the existing drive requires modernization.

A 20P41AF565RA0NNN can be considered where the motor and electrical system correspond to the 690 V AC / 565 A / 500 HP configuration.

A retrofit project should include a complete review of:

• Motor.
• Field system.
• Feedback.
• Power supply.
• Cabinet.
• Control system.
• Machine sequencing.
• Regenerative braking.
• Protective devices.

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49. Why the 20P41AF565RA0NNN Is a High-Power Drive

The combination of 565 A, 500 HP, 373 kW, and Frame C places this model in the high-power portion of the PowerFlex DC family.

It is designed for applications where the DC motor is a major component of the production machine.

At this power level, the drive should be considered as part of a complete electrical system.

That system can include:

• Transformer.
• Switchgear.
• Input protection.
• Line reactor.
• DC motor.
• Field supply.
• Motor cables.
• Feedback.
• PLC.
• Operator interface.
• Cabinet cooling.
• Grounding.

The drive cannot be evaluated independently from these supporting systems.

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50. Electrical Installation Scale

The 690 V AC selection data identifies approximately 462 A AC line current for the 565 A / 500 HP configuration.

This illustrates the scale of the associated incoming electrical system.

The final AC line-current calculation should nevertheless be based on the complete installation and applicable technical requirements.

Incoming switchgear, transformer capacity, line reactors, cables, protective devices, and grounding should all be appropriately engineered.

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51. Five Recommended Same-Series Models – Expanded Table

Model	Voltage	DC Current	HP	kW	Frame	Regenerative	Dimensions	Weight
20P41AF452RA0NNN	690 V AC	452 A	400 HP	298 kW	C	Yes	521 × 511 × 416 mm	72 kg
20P41AF565RA0NNN	690 V AC	565 A	500 HP	373 kW	C	Yes	521 × 511 × 416 mm	72 kg
20P41AF678RA0NNN	690 V AC	678 A	600 HP	447 kW	D	Yes	Configuration-dependent	Configuration-dependent
20P41AF791RA0NNN	690 V AC	791 A	700 HP	552 kW	D	Yes	Configuration-dependent	Configuration-dependent
20P41AF904RA0NNN	690 V AC	904 A	800 HP	597 kW	D	Yes	Configuration-dependent	Configuration-dependent

The five models form a closely related progression within the 690 V regenerative PowerFlex DC range.

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52. Five Same-Brand Popular / Related Models – Expanded Table

These products represent different PowerFlex configurations and should be treated as related products rather than automatic replacements.

Model	Series	Type	Voltage Class	Current / Rating	Power Class	Frame	Dimensions	Weight
20P21AF565RA0NNN	PowerFlex DC	Non-Regenerative DC	690 V AC	565 A	500 HP / 373 kW	C	521 × 511 × 416 mm	68 kg
20P41AF452RA0NNN	PowerFlex DC	Regenerative DC	690 V AC	452 A	400 HP / 298 kW	C	521 × 511 × 416 mm	72 kg
20P41AF678RA0NNN	PowerFlex DC	Regenerative DC	690 V AC	678 A	600 HP / 447 kW	D	Configuration-dependent	Configuration-dependent
20P41AE675RA0NNN	PowerFlex DC	Regenerative DC	575 V AC class	675 A	500 HP / 373 kW	C	521 × 511 × 416 mm	72 kg
25B-D010N114	PowerFlex 525	AC Drive	380…480 V AC	10.5 A	5 HP / 4 kW	B	228.09 × 139.95 × 239.01 mm	2.193 kg

The 25B-D010N114 is a much smaller AC-drive product with a 5 HP / 4 kW rating, embedded EtherNet/IP and safety features, and an IP20 NEMA/Open Type enclosure. Its mechanical dimensions and 2.193 kg weight are published separately from the high-power DC-drive family.

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53. Difference Between Same-Series and Related Models

The five same-series recommendations are directly useful when evaluating the 20P41AF565RA0NNN against different motor power requirements.

The same-brand related models serve a different purpose.

For example, the 20P21AF565RA0NNN is closely related electrically because it is the non-regenerative version of the same 690 V / 565 A / 500 HP class.

The 20P41AF452RA0NNN is useful when the motor requires the lower 400 HP class.

The 20P41AF678RA0NNN provides a higher 600 HP class.

The 20P41AE675RA0NNN belongs to the 575 V family rather than the 690 V family.

The 25B-D010N114 represents a much smaller AC-drive architecture and is relevant mainly as an example of a broader motor-control product family rather than as a direct substitute.

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54. Important Difference Between 565 A and 678 A

The difference between the 565 A and 678 A models is not only the current rating.

The 565 A model is Frame C, while the 678 A model is Frame D.

Characteristic	565 A	678 A
Model	20P41AF565RA0NNN	20P41AF678RA0NNN
Current	565 A	678 A
HP	500 HP	600 HP
kW	373 kW	447 kW
Frame	C	D
Regenerative	Yes	Yes
Four Quadrant	Yes	Yes
Mechanical Envelope	521 × 511 × 416 mm	Frame D / configuration-dependent
Drive Weight	72 kg	Configuration-dependent

Moving to the higher-current model can therefore require a larger cabinet and a different mechanical installation arrangement.

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55. Important Difference Between 452 A and 565 A

The 452 A and 565 A models share the Frame C platform.

Parameter	452 A	565 A
Model	20P41AF452RA0NNN	20P41AF565RA0NNN
Current	452 A	565 A
HP	400 HP	500 HP
kW	298 kW	373 kW
Frame	C	C
Dimensions	521 × 511 × 416 mm	521 × 511 × 416 mm
Weight	72 kg	72 kg
Regenerative	Yes	Yes

The primary difference is electrical capacity rather than the main physical frame.

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56. Installation Environment

Because the drive uses an IP20 / NEMA/UL Type Open configuration, it should normally be installed within a suitable control enclosure.

The installation environment should be reviewed for:

• Ambient temperature.
• Humidity.
• Dust.
• Conductive contamination.
• Chemical contamination.
• Vibration.
• Altitude.
• Ventilation.
• Cooling.

The presence of conformal coating provides additional protection to electronic assemblies, but it does not eliminate environmental installation requirements.

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57. Maintenance and Reliability Strategy

For a high-power DC drive installation, maintenance should be considered from the beginning of the project.

A useful maintenance strategy can include:

Visual Inspection

Check for dust, contamination, discoloration, overheating, loose components, and damaged wiring.

Cooling Inspection

Check fans, ventilation paths, filters, and cabinet airflow.

Electrical Inspection

Check power terminals, grounding connections, field wiring, motor connections, and protective devices.

Feedback Inspection

Check tachometer or encoder wiring and signal integrity.

Control Inspection

Review fault history, control references, and operating parameters.

Motor Inspection

Check brushes, commutator condition, bearings, insulation, field circuit, and cooling system as applicable to the motor design.

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58. Product Selection Recommendations

When evaluating the 20P41AF565RA0NNN, the first selection step should be confirming the motor’s actual electrical requirements.

The motor should have a compatible armature voltage and current rating.

The field system must also be compatible.

The machine’s regenerative requirements should then be evaluated.

If the machine requires frequent regenerative braking or reversing, the four-quadrant architecture is particularly relevant.

The AC supply must also match the 690 V class.

Finally, cabinet dimensions and thermal requirements must be checked.

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59. Complete Product Parameter Summary

Category	Parameter	Specification
Identification	Model	20P41AF565RA0NNN
Identification	Brand	Allen-Bradley
Identification	Series	PowerFlex DC
Drive	Type	Regenerative DC Drive
Drive	Operation	Four Quadrant
Drive	Input Type	6 Pulse
Electrical	AC Voltage Class	690 V AC
Electrical	Input Phase	3 Phase
Electrical	DC Current	565 A
Electrical	Motor Power	500 HP
Electrical	Motor Power	373 kW
Field	Field Supply	Single-Phase Regulated
Feedback	Encoder Input	Included
Feedback	DC Analog Tachometer Input	Included
Construction	Frame	C
Enclosure	Protection	IP20
Enclosure	NEMA/UL	Type Open
Protection	Conformal Coating	Yes
Interface	HIM	Blank Plate / No HIM
Communication	Standard Communication	None
Mechanical	Height	521 mm
Mechanical	Width	511 mm
Mechanical	Depth	416 mm
Mechanical	Drive Weight	72 kg
Mechanical	Packaged Weight	94 kg
Thermal	Approx. Total Drive Loss	2,300 W
Application	Typical Motor	Large Industrial DC Motor
Application	Typical Power Class	500 HP / 373 kW

The principal technical values in this summary correspond to the published PowerFlex DC technical data and the product configuration for the 20P41AF565RA0NNN.

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60. Final Product Summary

The Allen-Bradley 20P41AF565RA0NNN is a high-power PowerFlex DC regenerative drive designed for large industrial DC motor systems.

Its principal electrical rating is 565 A, corresponding to approximately 500 HP / 373 kW in the 690 V AC three-phase PowerFlex DC product family.

The drive uses a six-pulse input, four-quadrant regenerative operation, and a single-phase regulated field supply.

Its enclosure is IP20 / NEMA/UL Type Open, with conformal coating, no HIM / blank-plate configuration, and no standard communication module.

Mechanically, the drive uses Frame C.

The principal mechanical envelope is approximately 521 mm × 511 mm × 416 mm, with a drive weight of approximately 72 kg and a packaged weight of approximately 94 kg.

The model is particularly suitable for large industrial machinery requiring high DC motor torque and controlled bidirectional operation.

Typical applications include large winding machines, unwinding systems, paper-processing machinery, steel and metal-processing equipment, large conveyors, roll drives, reversing machinery, high-inertia equipment, and existing 500 HP DC motor installations.

Its four-quadrant regenerative architecture is one of its most important characteristics.

The drive can control forward motoring, reverse motoring, forward regenerative braking, and reverse regenerative braking.

This makes it appropriate for machinery where the motor repeatedly transitions between driving and braking conditions.

The 20P41AF452RA0NNN provides a lower 400 HP / 298 kW class within the same 690 V regenerative family.

The 20P41AF678RA0NNN provides the next higher 600 HP / 447 kW class and changes to Frame D.

The 20P41AF791RA0NNN and 20P41AF904RA0NNN extend the same family into still higher power levels.

For applications where regeneration is not required, the 20P21AF565RA0NNN represents the corresponding 565 A / 500 HP non-regenerative configuration.

For broader AC-drive modernization, smaller PowerFlex AC products can also be evaluated, but their motor type, voltage class, current range, control architecture, and mechanical installation are substantially different from this high-power DC drive.

From an engineering perspective, the most important specifications of the 20P41AF565RA0NNN are:

690 V AC class, three-phase input, six-pulse input, 565 A DC output, 500 HP, 373 kW, four-quadrant regenerative operation, regulated field supply, Frame C, IP20 / NEMA/UL Type Open enclosure, conformal coating, no HIM / blank plate, no standard communication module, approximately 521 × 511 × 416 mm dimensions, approximately 72 kg drive weight, and approximately 94 kg packaged weight.

For a large industrial DC motor system, these specifications define the model as a high-current regenerative drive intended for demanding machinery where controlled torque, speed regulation, reversing, and regenerative braking are important parts of the production process.