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20P21AD6P0RA0NNN PowerFlex DC Drive

Detailed Product Parameters, Product Introduction, Applications, Advantages, Series Information and Recommended Related Models

The 20P21AD6P0RA0NNN is a compact industrial DC drive designed for controlling DC motors in machinery, process equipment and retrofit applications.

It is a 3 HP / 2.2 kW, 6 A, 480 VAC-class DC drive in the PowerFlex DC family. The configuration is non-regenerative, three-phase input, six-pulse, IP20 / NEMA/UL Type Open, with conformal coating, a blank-plate/no-HIM configuration, and no standard communication module.

This model is particularly useful when an existing DC motor needs controlled starting, stopping, speed regulation and torque management without replacing the complete mechanical system.

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1. Basic Product Information

The most important electrical specifications are the 6 A output current, 3 HP / 2.2 kW motor rating, and 480 VAC three-phase input class.

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2. Product Identification

The complete catalog number is:

20P21AD6P0RA0NNN

The catalog number identifies a specific configuration rather than simply identifying a generic drive.

The important characteristics represented by this configuration include the PowerFlex DC product family, 380–480 VAC three-phase input class, 6 A output rating, non-regenerative operation, and the specified enclosure and accessory configuration.

This makes the exact catalog number important when replacing an existing drive.

A drive with a similar current rating is not necessarily a direct replacement if its regenerative configuration, enclosure, field supply, control interface or accessory configuration is different.

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3. Brand and Product Series

The PowerFlex DC series is designed specifically for industrial DC motor control.

Unlike an ordinary variable-frequency AC drive, a DC drive is designed to control the armature and field circuits of a DC motor.

This distinction is important because the motor must be compatible with the drive’s armature voltage, armature current and field requirements.

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4. Detailed Electrical Parameters

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5. Product Introduction

The 20P21AD6P0RA0NNN is intended for applications where a DC motor requires controlled electrical operation.

The drive converts the incoming three-phase AC supply into controlled DC power for the motor.

By controlling the motor’s electrical parameters, the drive can provide controlled acceleration, adjustable operating speed and controlled motor torque.

This is particularly useful for industrial machinery in which direct connection of a DC motor to a fixed supply would not provide the required level of process control.

The 3 HP rating makes this model suitable for relatively small industrial DC motors compared with the larger PowerFlex DC models.

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6. 3 HP / 2.2 kW Power Class

The drive is rated for approximately 3 HP, equivalent to approximately 2.2 kW.

This places it toward the lower end of the PowerFlex DC product range.

The smaller rating makes the drive appropriate for applications such as:

• Small production machines.
• Small conveyors.
• Machine tools.
• Small winding equipment.
• Rollers.
• Printing machinery.
• Small material-handling systems.
• Packaging machinery.
• Process machinery.
• Retrofit projects involving smaller DC motors.

The 6 A output rating is an important selection parameter.

A motor should not simply be selected because its horsepower appears to match the drive.

The motor’s actual armature current, armature voltage and field specifications must also be checked.

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7. 6 A Output Current

The 6 A DC output rating determines the approximate motor current class supported by the drive.

For DC motors, armature current has a direct relationship with torque production.

Therefore, current capacity is important when selecting a DC drive for a machine that must accelerate loads or provide significant mechanical torque.

The actual motor nameplate should be checked for:

• Armature voltage.
• Armature current.
• Field voltage.
• Field current.
• Base speed.
• Maximum speed.
• Motor horsepower.
• Duty rating.

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8. Six-Pulse Input Configuration

The 20P21AD6P0RA0NNN uses a six-pulse input configuration.

Six-pulse controlled rectification is a well-established topology for industrial DC drives.

It provides a practical method of converting three-phase AC input power into controlled DC output power.

This architecture is commonly associated with industrial DC motor control because it is relatively straightforward, well understood and suitable for a wide range of motor-control applications.

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9. Non-Regenerative Operation

This particular model is a non-regenerative DC drive.

That means it is intended for conventional applications where continuous regeneration of braking energy back into the AC supply is not required.

This is an important distinction when selecting a drive.

For example, an application involving:

• Frequent reversing.
• Rapid deceleration.
• Large overhauling loads.
• Significant regenerative energy.

may require a regenerative drive instead.

For ordinary speed-controlled applications where regeneration is not a primary requirement, the non-regenerative configuration can be a practical choice.

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10. Two-Quadrant Operation

The drive is associated with two-quadrant DC motor operation.

This is suitable for many conventional applications in which the motor operates primarily in one direction.

Typical examples include:

• Conveyor systems.
• Rollers.
• Fans.
• Pumps.
• Small process machines.
• Certain machine-tool applications.

The exact braking method must be evaluated according to the load.

A two-quadrant configuration should not automatically be treated as equivalent to a four-quadrant regenerative system.

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11. Regulated Field Supply

DC motors generally contain both an armature circuit and a field circuit.

The field establishes the magnetic conditions required for motor operation.

The PowerFlex DC architecture incorporates a regulated field converter.

This allows the field circuit to be controlled as part of the complete motor-drive system.

For applications requiring stable speed and predictable motor behavior, proper field configuration is essential.

The motor field voltage and current should therefore always be compared with the drive’s available field-supply characteristics before installation.

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12. Speed Control

One of the main reasons for using a DC drive instead of a simple fixed-voltage DC supply is controlled motor speed.

The drive can regulate motor operation according to the required speed reference.

Depending on the application configuration, the speed reference can be integrated into the machine’s control system.

This makes the drive suitable for machinery where speed must be adjusted during production.

Examples include:

• Variable-speed rollers.
• Small conveyors.
• Printing machinery.
• Winding equipment.
• Processing machines.
• Material-handling equipment.

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13. Feedback Capability

The PowerFlex DC platform supports feedback options including DC tachometer and encoder-based feedback arrangements.

Feedback is useful when precise speed control is required.

For example, if a machine needs to maintain a stable speed despite changes in load, the controller can use actual motor-speed feedback to improve regulation.

This is especially useful in:

• Winding machines.
• Rollers.
• Printing machines.
• Process lines.
• Precision machinery.
• Tension-control applications.

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14. Product Applications

14.1 Small Conveyors

A small conveyor can require controlled acceleration and adjustable speed.

The drive can provide a gradual increase in motor speed rather than simply switching the motor directly to full operating voltage.

This can reduce mechanical shock on:

• Belts.
• Chains.
• Gearboxes.
• Couplings.
• Shafts.

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14.2 Rollers

Industrial rollers often need stable speed control.

A DC drive can provide adjustable motor speed and controlled torque.

This can be useful in processing equipment where material movement needs to remain consistent.

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14.3 Printing Equipment

Printing machinery can require controlled motor speed.

Speed variation can influence:

• Material movement.
• Registration.
• Tension.
• Product quality.

A controlled DC drive can therefore be useful in smaller printing and converting systems.

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14.4 Winding Machines

Winding applications often require controlled speed and torque.

As the diameter of the material roll changes, the machine’s operating characteristics can also change.

The drive can be integrated into a broader control system to maintain the desired motor operating conditions.

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14.5 Packaging Machinery

Some packaging machines use small DC motors for rollers, feeders or auxiliary mechanisms.

A compact 3 HP DC drive can be appropriate when controlled DC motor operation is required.

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14.6 Machine Tools

Certain older machine tools use DC motors for spindle or auxiliary functions.

In retrofit situations, a modern digital DC drive can provide a way to replace an older electronic controller while retaining a compatible motor.

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14.7 Retrofit Applications

One of the strongest application areas for the PowerFlex DC series is modernization.

An industrial machine may have a mechanically reliable DC motor but an outdated drive.

Replacing the drive can potentially extend the service life of the machine without redesigning the entire mechanical system.

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15. Main Product Advantages

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16. Compact Frame A Construction

The Frame A design is intended for the lower power range of the PowerFlex DC family.

Compared with the large Frame C and Frame D units used for hundreds of amps, Frame A equipment is much more compact.

This makes the model easier to integrate into smaller electrical cabinets.

However, the actual cabinet dimensions must include:

• Cable entry space.
• Ventilation space.
• Service access.
• Clearance around the drive.
• Heat dissipation requirements.
• Space for protective devices.
• Space for contactors or disconnect equipment.

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17. Dimensions and Weight

Mechanical information is particularly important when replacing an existing drive.

The 17.8752 in / approximately 454 mm dimension should be treated as the listed frame dimension rather than assuming that it represents every external dimension of the complete assembly.

For a final cabinet drawing, the exact mechanical drawing should be used.

The weight is approximately 4.5 kg, but packaging, accessories and shipping materials can increase the overall shipping weight.

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18. Mechanical Installation

The drive uses an open-type IP20 construction.

Therefore, it should normally be installed inside an appropriate industrial electrical cabinet.

The cabinet should protect the drive from:

• Water.
• Excessive dust.
• Conductive contamination.
• Mechanical damage.
• Excessive humidity.
• Oil mist.
• Corrosive substances.

Adequate airflow is also important because the power electronics generate heat during operation.

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19. Electrical Installation

The electrical installation should be designed around the complete motor system rather than the drive alone.

Important elements include:

• Incoming AC protection.
• Disconnect equipment.
• Motor armature wiring.
• Field wiring.
• Grounding.
• Feedback wiring.
• Control wiring.
• Emergency-stop architecture.
• Motor overload protection.
• Cabinet ventilation.

The 6 A rating does not mean that every installation should simply use a 6 A protective device.

Protection must be selected according to the drive’s electrical characteristics, applicable standards and the overall system design.

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20. Motor Compatibility

Before using 20P21AD6P0RA0NNN, the motor nameplate should be checked carefully.

A 3 HP motor with an unsuitable armature voltage or field specification should not be treated as automatically compatible.

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21. Recommended Same-Series Models

The following models are useful comparisons within the same PowerFlex DC family.

These five models are particularly useful when the primary requirement is to remain within the same non-regenerative PowerFlex DC family.

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22. Same-Series Model Comparison

The main difference between these models is the motor-current and power range.

Therefore, the correct selection should be based primarily on the motor’s actual electrical ratings rather than choosing the largest available model.

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23. Five Related Regenerative Models

For applications requiring regenerative braking or four-quadrant operation, the regenerative members of the same family are worth considering.

The closest regenerative comparison to the target model is 20P41AD6P0RA0NNN.

The major difference is the regenerative configuration.

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24. Non-Regenerative Versus Regenerative

If the machine frequently decelerates a high-inertia load, the regenerative version may be a more suitable technical comparison.

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25. Five Popular Models From the Same Brand

The following products are useful examples from the broader industrial automation portfolio.

They are not direct electrical replacements for the target DC drive.

They are included as related products because they are commonly used in motor control and industrial automation systems.

These products should not be selected as direct substitutes without considering the motor type, control method, power rating and system architecture.

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26. AC Drive Conversion Considerations

A common modernization strategy is to replace an existing DC motor and DC drive with an AC motor and AC drive.

This can offer benefits such as:

• Greater availability of motors.
• Easier long-term maintenance.
• Broad motor selection.
• Modern drive technology.
• Potential efficiency improvements.

However, converting a complete machine from DC to AC is considerably more involved than replacing the DC drive alone.

The mechanical system, motor mounting, coupling, inertia, speed range, torque requirements and control strategy all need to be evaluated.

Therefore, retaining the existing DC motor and replacing the drive can still be an attractive solution when the motor is mechanically sound.

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27. Retrofit Advantages

The 20P21AD6P0RA0NNN can be particularly useful in retrofit projects.

For example, an older machine may contain:

• A reliable 3 HP DC motor.
• An obsolete analog DC controller.
• Older control electronics.
• A mechanical system that remains serviceable.

In such a situation, the drive can become the central part of an electrical modernization.

The mechanical equipment may remain largely unchanged while the motor-control electronics are upgraded.

This can reduce the amount of mechanical modification required.

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28. Advantages for Small Industrial Machines

The 3 HP rating is useful for applications that are too large for simple fractional-horsepower motor control but do not require the large current ratings of industrial high-power DC drives.

Potential applications include:

• Small conveyors.
• Small rollers.
• Small winders.
• Printing machinery.
• Packaging machinery.
• Machine tools.
• Small process lines.
• Material-handling equipment.
• Textile machinery.
• Small production machines.

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29. Conformal Coating

The specified configuration includes conformal coating.

Conformal coating provides an additional protective layer over electronic components.

This can be beneficial in industrial environments where moderate levels of humidity or airborne contamination may exist.

However, conformal coating does not turn an IP20 drive into a sealed outdoor device.

The drive should still be installed in a suitable cabinet and protected from direct exposure to:

• Water.
• Oil.
• Conductive dust.
• Corrosive chemicals.
• Excessive contamination.

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30. No HIM / Blank Plate Configuration

The model is supplied with a blank plate rather than a standard local HIM.

This configuration can make sense when the drive is intended to be controlled by:

• A PLC.
• A machine HMI.
• A supervisory control system.
• External digital/analog control signals.
• A centralized automation architecture.

The absence of a local HIM does not mean that the drive lacks programming capability.

It means that the selected catalog configuration does not include the standard local operator interface.

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31. No Standard Communication Module

The specified catalog configuration does not include a standard communication module.

This can be useful when the application does not require an additional network option.

The drive can instead be integrated into a machine using its available control interfaces and the selected feedback/control architecture.

For a modern plant-wide network, however, the communication requirements should be evaluated before selecting the exact catalog number.

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32. Typical Control Functions

A DC drive of this type can be used to manage several aspects of motor operation.

Typical functions include:

• Speed control.
• Current control.
• Torque-related control.
• Acceleration control.
• Deceleration control.
• Current limiting.
• Field control.
• Feedback-based speed regulation.
• Fault monitoring.
• Motor protection functions.

These functions allow the drive to become part of a complete machine-control system rather than simply acting as a basic motor starter.

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33. Recommended Application Matching

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34. Product Selection Guide

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35. Detailed Technical Summary

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36. Main Advantages at a Glance

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37. Overall Product Evaluation

The 20P21AD6P0RA0NNN is a relatively compact industrial DC drive intended for 3 HP / 2.2 kW DC motor applications.

Its 6 A output current makes it suitable for smaller industrial DC motors while retaining the control capabilities associated with the PowerFlex DC platform.

The 480 VAC three-phase input class allows it to be integrated into common industrial power systems.

Its six-pulse converter, regulated field supply, two-quadrant operation and non-regenerative configuration make it appropriate for conventional DC motor applications where continuous regenerative operation is not required.

The Frame A construction keeps the unit relatively compact compared with higher-current PowerFlex DC drives.

The IP20 / NEMA/UL Type Open construction means that it should be installed inside a properly designed electrical cabinet rather than exposed directly to the industrial environment.

The conformal coating provides additional electronic protection, while the blank-plate/no-HIM configuration is useful for installations where the drive is operated through a PLC, HMI or other centralized control system.

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38. Final Recommendation

For a machine using a 3 HP / approximately 2.2 kW DC motor, the 20P21AD6P0RA0NNN is a logical PowerFlex DC model to evaluate when the motor’s armature voltage, armature current and field requirements are compatible.

If the motor is smaller, the 20P21AD4P1RA0NNN provides a lower-current option.

If the motor is larger, the 20P21AD010RA0NNN, 20P21AD014RA0NNN and 20P21AD019RA0NNN provide progressively higher current ratings.

If regenerative braking is required, 20P41AD6P0RA0NNN is the closest related configuration.

For modernization projects where the existing DC motor is still mechanically sound, staying within the PowerFlex DC family can simplify the electrical replacement process.

For new machine designs, however, it is worth comparing the DC solution with a modern AC motor and AC drive architecture, especially when long-term motor availability, maintenance strategy and overall machine modernization are major considerations.

In short, 20P21AD6P0RA0NNN is a 3 HP, 2.2 kW, 6 A, 480 VAC-class, three-phase, six-pulse, non-regenerative DC drive in Frame A, intended for compact industrial DC motor applications, machinery modernization and applications requiring controlled speed and torque from a compatible DC motor.