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20P21AD027RA0NNN — Detailed Product Overview, Specifications, Applications, Advantages and Related Models

1. Product Overview

The 20P21AD027RA0NNN is a PowerFlex DC drive designed for industrial control of DC motors. It is a 480 VAC-class, three-phase, 27 A, 15 HP / approximately 11 kW, non-regenerative DC drive with an IP20 open enclosure, Frame A construction, conformal coating, a blank front plate instead of a local operator interface, and no communication module included as standard.

It is intended primarily for industrial machines that use DC motors and require controlled motor speed, torque, acceleration, and deceleration.

The 27 A rating places this model above the 19 A / 10 HP version and makes it appropriate for larger DC motors and heavier-duty machinery. It can be particularly useful in retrofit projects where the existing DC motor and mechanical equipment are still suitable for continued operation.

The drive uses a six-pulse input arrangement and a regulated single-phase field supply. Its operating configuration is two-quadrant and non-regenerative, making it best suited to applications in which the motor primarily operates in the motoring mode rather than repeatedly returning significant mechanical energy to the electrical supply.

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2. Brand and Product Series

The model is therefore positioned as a 15 HP-class industrial DC motor controller for medium-sized machinery and process equipment.

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3. Detailed Technical Specifications

The mechanical dimensions should be treated as approximate cabinet-planning values. The exact mounting drawing should be checked for a replacement project because mounting hardware, terminal arrangements, and required clearances can affect the actual installation space.

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4. Electrical Rating

The most important electrical rating of the 20P21AD027RA0NNN is its 27 A armature current capacity.

The drive is rated for a 15 HP motor, corresponding to approximately 11 kW.

For industrial DC motor selection, horsepower is only one part of the calculation. The motor’s actual armature current, armature voltage, field voltage, field current, base speed, maximum speed, and feedback arrangement should also be checked.

A suitable motor should have an armature current that does not exceed the drive’s permitted operating range.

This is particularly important for machines that experience frequent acceleration, high starting torque, sudden load changes, or extended high-load operation.

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5. 480 VAC Three-Phase Input

The 20P21AD027RA0NNN is intended for a 480 VAC-class three-phase industrial power supply.

A nominal 460 VAC system is commonly associated with this drive class.

The three-phase input provides a conventional industrial power arrangement, while the six-pulse converter architecture provides controlled DC output for the motor armature.

This configuration is well suited to industrial plants where three-phase AC power is already available.

Typical environments include:

• Manufacturing plants
• Processing facilities
• Material-handling systems
• Printing plants
• Textile machinery
• Paper-processing equipment
• Metal-processing machinery
• Machine-tool systems
• Industrial production lines

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6. 27 A Armature Output

The 27 A armature rating is the defining characteristic of this model.

Compared with a 10 A or 14 A DC drive, the 27 A configuration provides considerably greater current capacity.

This makes it suitable for motors requiring approximately:

15 HP / 11 kW / 27 A-class armature current

The higher current rating makes this model useful for larger rollers, conveyors, feeders, processing machines, and other industrial loads.

When selecting a replacement, the actual motor nameplate should be used rather than selecting solely according to horsepower.

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7. Two-Quadrant Operation

The 20P21AD027RA0NNN uses a two-quadrant operating configuration.

In practical terms, it is designed primarily for controlled motoring operation in both forward and reverse directions where the application configuration permits it, rather than providing full four-quadrant regenerative operation.

This makes it a good choice for conventional motor-driven machinery.

Typical applications include:

• Conveyors
• Feed systems
• Roll drives
• Pumps
• Fans
• Processing machines
• Machine tools
• Material-handling equipment
• Production machinery

Applications with substantial regenerative braking should be evaluated separately.

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8. Non-Regenerative Configuration

The 20P21AD027RA0NNN is a non-regenerative DC drive.

This is an important distinction when selecting the drive.

If a machine has a high-inertia load and frequently decelerates, the mechanical energy stored in the load can flow back toward the drive.

A non-regenerative configuration is not intended to continuously return that energy to the AC supply in the same way as a regenerative drive.

Therefore, applications such as high-performance winders, unwinders, hoists, and certain high-inertia machines may require a regenerative configuration instead.

For conventional conveyors and similar motoring applications, the non-regenerative arrangement can be a practical and straightforward choice.

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9. Regenerative and Non-Regenerative Comparison

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10. Product Introduction

The PowerFlex DC platform is intended for industrial applications where DC motors remain an important part of the machine architecture.

The 20P21AD027RA0NNN provides a relatively high current rating within the compact Frame A class.

It combines:

• 27 A armature current
• 15 HP motor capacity
• 480 VAC-class input
• Three-phase power
• Six-pulse input
• Regulated field supply
• Two-quadrant operation
• IP20 enclosure
• Conformal coating
• Feedback capability
• Flexible I/O

This combination makes the drive suitable for both new DC control installations and replacement projects involving existing DC motors.

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11. Main Product Applications

11.1 Conveyor Systems

The 20P21AD027RA0NNN can be used for industrial conveyors driven by compatible DC motors.

The drive can control motor speed and acceleration, helping the machine start smoothly rather than applying an abrupt mechanical load.

Potential applications include:

• Belt conveyors
• Roller conveyors
• Assembly-line conveyors
• Transfer conveyors
• Packaging conveyors
• Material-handling conveyors
• Production-line systems

For larger conveyor systems, the 27 A rating provides a useful increase in capacity compared with smaller DC drive configurations.

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12. Roll and Roller Applications

Roll drives are one of the practical application areas for industrial DC drives.

The drive can be used with suitable DC motors in:

• Paper rollers
• Textile rollers
• Material-processing rollers
• Feed rollers
• Production rollers
• Steel-processing equipment
• Film-processing equipment

Stable speed control is particularly important when the machine needs consistent material movement.

Where several rollers must maintain a defined speed relationship, feedback and control-system integration should be evaluated carefully.

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13. Printing Machinery

DC motor technology has historically been widely used in printing and web-processing machinery.

The 20P21AD027RA0NNN can be considered for suitable existing equipment where a DC motor remains installed.

Possible applications include:

• Printing presses
• Paper feeders
• Roll drives
• Web-handling systems
• Printing auxiliary drives
• Material feed systems
• Rewind and processing equipment

For tension-critical applications, regenerative requirements and feedback requirements should be checked carefully.

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14. Textile Machinery

Textile machines often require stable and adjustable speed.

The 20P21AD027RA0NNN can provide controlled DC motor operation for suitable machinery.

Potential uses include:

• Textile rollers
• Feed systems
• Spinning machinery
• Winding systems
• Material handling
• Processing lines
• Tension-related machinery

If the machine has rapidly changing tension or frequent braking, the application should be evaluated for regenerative operation.

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15. Paper and Web Processing

Paper and web-processing machines can benefit from accurate speed control.

Typical applications include:

• Paper feed systems
• Roll drives
• Web transport
• Coating equipment
• Processing rollers
• Rewind systems
• Material feed mechanisms

The drive can help provide a controlled motor speed reference and can be integrated with external control equipment.

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16. Metal Processing

The 15 HP capacity makes this model appropriate for a number of smaller and medium-sized metal-processing systems.

Potential applications include:

• Feed rollers
• Material transfer
• Processing rolls
• Cutting-machine drives
• Grinding-machine auxiliaries
• Production equipment
• Metal-handling machinery

The suitability of the drive depends on the motor’s actual current rating and the machine’s acceleration and braking requirements.

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17. Machine Tools

The 20P21AD027RA0NNN can also be used with compatible DC motors in machine-tool applications.

Possible applications include:

• Grinding machines
• Cutting machines
• Feed mechanisms
• Spindle-related systems
• Specialized production machinery
• Material-processing machines

For precision applications, feedback selection becomes particularly important.

A tachometer or encoder feedback system can help maintain motor speed under changing mechanical loads.

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18. Pumps and Fans

The drive can also control suitable DC motors used for pumps and fans.

For a pump, adjusting motor speed can provide process-flow control.

For a fan or blower, speed reduction can reduce unnecessary operation when full airflow is not required.

However, the actual load characteristics must be reviewed before selecting the drive.

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19. Product Advantages

19.1 Higher 27 A Current Capacity

The 27 A output rating is one of the main reasons to select this model.

It provides a higher capacity than:

• 10 A models
• 14 A models
• 19 A models

This makes it appropriate for larger DC motors within the PowerFlex DC family.

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19.2 15 HP / 11 kW Capacity

The 15 HP / approximately 11 kW rating gives the drive a useful position for medium industrial applications.

It is large enough for many conveyors, rollers, processing machines, and machine tools while remaining considerably smaller than high-power industrial DC drive systems.

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19.3 Industrial 480 VAC Supply

The 480 VAC-class input makes the drive suitable for many industrial electrical systems.

Three-phase input also provides a conventional industrial power arrangement.

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19.4 Regulated Field Supply

The drive provides a single-phase regulated field supply.

Field regulation is important because the DC motor field directly influences motor operating characteristics.

Correct field voltage and current should always be established from the motor’s nameplate and application requirements.

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19.5 Feedback Capability

The PowerFlex DC platform provides support for feedback arrangements such as DC tachometer and encoder feedback.

This can improve speed regulation when the machine experiences changing load conditions.

Feedback can be particularly useful for:

• Roll drives
• Printing machines
• Textile equipment
• Feed systems
• Process machinery
• Speed-sensitive production equipment

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19.6 Flexible I/O

The drive platform provides useful standard I/O capability.

This allows the drive to be integrated into conventional hardwired control systems.

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20. Conformal Coating

The model is supplied with conformal coating.

This provides an additional layer of protection for the electronic circuitry against certain industrial environmental contaminants.

It can be beneficial in industrial environments where electronics may be exposed to:

• Dust
• Humidity
• Airborne contamination
• Production-related particles

However, conformal coating should not be interpreted as waterproof protection.

The IP20 enclosure still requires installation in a suitable protected cabinet.

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21. IP20 / NEMA/UL Type Open Enclosure

The drive uses an IP20 / NEMA/UL Type Open enclosure.

This means it is intended to be installed inside a suitable electrical cabinet or other protected installation environment.

The cabinet should protect the drive against:

• Direct water
• Condensation
• Excessive dust
• Conductive contamination
• Mechanical impact
• Harsh outdoor exposure

Adequate ventilation is also necessary because the drive produces heat during normal operation.

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22. Frame A Construction

The 20P21AD027RA0NNN uses Frame A construction.

Frame size is important when planning a replacement because it affects:

• Mounting
• Cabinet space
• Cable routing
• Cooling
• Service access
• Terminal access
• Mechanical clearances

Although the 27 A model provides considerably more electrical capacity than smaller models, it remains within the compact Frame A configuration for this particular product family.

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23. Physical Dimensions and Weight

The approximate physical envelope for this model is:

425 mm × 279 mm × 425 mm

or approximately:

16.73 in × 10.98 in × 16.73 in

The approximate weight is:

14.2 kg

or approximately:

31.3 lb

These values are useful for preliminary cabinet design and shipping calculations.

Additional cabinet clearance must be provided around the drive.

The dimensions of the drive itself should not be treated as the complete required cabinet space.

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24. Operator Interface

The 20P21AD027RA0NNN is configured with a blank plate instead of a HIM operator interface.

This configuration is useful when the machine is controlled externally.

For example, the drive may receive commands from:

• PLC
• External operator station
• Pushbutton panel
• Analog reference
• Machine controller
• External automation system

A separate operator interface can be considered when local keypad operation is required.

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25. Communication Configuration

The standard model does not include a communication module.

This is appropriate for relatively simple installations where the drive is controlled through conventional I/O.

For more advanced systems, communication options can be evaluated according to the control architecture.

Potential functions include:

• Start/stop command
• Speed reference
• Drive status
• Fault information
• Parameter access
• Diagnostic information
• Remote monitoring
• PLC integration

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26. Standard I/O Configuration

The drive platform provides a useful combination of digital and analog I/O.

The exact I/O assignment depends on the machine-control design.

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27. Typical Control Functions

A machine using the 20P21AD027RA0NNN may use digital inputs for:

• Start
• Stop
• Drive enable
• Forward
• Reverse
• Fault reset
• External fault
• Emergency-related interlock logic

Analog inputs may be used for:

• Speed reference
• Process reference
• External control signal

Analog outputs can provide information such as:

• Motor speed
• Armature current
• Process-related feedback

This flexibility allows the drive to work with conventional automation systems without requiring a communication network for every control function.

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28. Five Recommended Models from the Same Series or Related Family

The following models are useful alternatives or comparison models within the same DC-drive family.

*Approximate physical values should be confirmed against the specific installation drawing before replacement.

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29. Recommended Model 1 — 20P21AD019RA0NNN

The 20P21AD019RA0NNN is the closest lower-current alternative.

It provides approximately 19 A and a 10 HP / 7.5 kW power class.

It is appropriate when the existing DC motor requires less current than the 27 A capacity of the main model.

It is particularly useful when the application is similar but the motor size is smaller.

Typical applications include:

• Medium conveyors
• Feed systems
• Rollers
• Printing machinery
• Textile equipment
• Small processing machines

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30. Recommended Model 2 — 20P21AD035RA0NNN

The 20P21AD035RA0NNN provides approximately 35 A and a 20 HP / 15 kW power class.

It is a natural step upward from the 27 A model.

It can be considered when:

• Motor current exceeds 27 A
• Motor power is approximately 20 HP
• The load requires additional torque capacity
• The machine experiences heavier operating conditions

Potential applications include:

• Large conveyors
• Heavy rollers
• Material-processing machinery
• Production equipment
• Larger machine tools

Because the power rating is higher, cabinet heat dissipation and mechanical dimensions should be evaluated separately.

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31. Recommended Model 3 — 20P21AD045RA0NNN

The 20P21AD045RA0NNN is a higher-capacity configuration at approximately 45 A.

It corresponds to approximately 25 HP in the 460 VAC class.

This model is more appropriate for larger DC motors and heavier industrial machinery.

Typical applications can include:

• Large process machinery
• Heavy material handling
• Larger roll drives
• Industrial feeders
• Production machinery
• Larger machine tools

It should not be selected simply because it has a higher current rating.

The actual motor nameplate and machine duty cycle should determine the correct size.

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32. Recommended Model 4 — 20P21AD052RA0NNN

The 20P21AD052RA0NNN provides approximately 52 A of armature current and is approximately a 30 HP-class drive.

It is appropriate for substantially larger DC motors than the 27 A model.

Possible applications include:

• Heavy-duty conveyors
• Large rollers
• Industrial processing equipment
• Large production machinery
• High-load material handling

This model is better suited to machines where the 27 A and 35 A classes do not provide sufficient capacity.

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33. Recommended Model 5 — 20P41AD027RA0NNN

The 20P41AD027RA0NNN is the most important related alternative when the application requires regenerative operation.

It has approximately the same:

• 27 A current class
• 15 HP power class
• 460/480 VAC input class

However, it uses a regenerative operating architecture.

This makes it more suitable for:

• Winders
• Unwinders
• High-inertia machinery
• Hoisting systems
• Frequent braking applications
• Four-quadrant applications

The 20P21AD027RA0NNN should therefore be selected for conventional non-regenerative applications, while the 20P41AD027RA0NNN becomes more relevant when regeneration is a major requirement.

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34. Five Popular Models from the Same Brand

For a broader product comparison, the following models are useful reference points.

Some are DC drives and some are AC drives.

The AC models are not direct replacements for the 20P21AD027RA0NNN because they are designed for AC motors.

They are more relevant when the objective is to modernize an existing machine and convert the motor technology.

The AC-drive selections above should be considered modernization alternatives, rather than direct electrical substitutions.

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35. DC Drive vs. AC Drive

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36. Why This Model Is Valuable for Retrofit Projects

The 20P21AD027RA0NNN can be especially valuable in industrial retrofit work.

Many industrial machines have mechanical systems that remain serviceable for decades.

A machine may have:

• A good gearbox
• A reliable mechanical transmission
• A serviceable DC motor
• Existing feedback devices
• Established machine wiring
• Existing control logic
• Proven production parameters

Replacing the drive rather than redesigning the entire machine can therefore reduce the scope of the project.

A suitable DC drive may allow much of the original machine architecture to remain intact.

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37. Speed Regulation

One of the principal functions of the drive is controlled motor speed.

The drive can receive a speed command and regulate the motor accordingly.

Depending on the machine design, the reference can come from:

• Analog input
• PLC
• External potentiometer
• Preset speed
• Process controller
• Automation system

With feedback, the drive can compare the desired speed with the actual motor speed and make adjustments to maintain the required operating point.

This is particularly useful for machines where load changes would otherwise cause unwanted speed variation.

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38. Torque Control

DC motor armature current is closely associated with motor torque.

The 27 A current capacity therefore provides the drive with substantial torque-control capability for suitable 15 HP-class DC motors.

This can be useful for:

• Feed mechanisms
• Roll drives
• Conveyors
• Material processing
• Machine tools
• Production machinery

The correct current limits must always be established according to the motor and machine requirements.

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39. Field Control

The drive provides a regulated single-phase field supply.

This is important because DC motor field characteristics influence motor speed and torque behavior.

During commissioning, the field voltage and current should be matched carefully to the motor’s specifications.

The following motor nameplate information should be recorded:

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40. Feedback Capability

The PowerFlex DC platform supports feedback technologies including DC tachometer and encoder arrangements.

Feedback is particularly valuable when the machine requires stable speed under changing load.

For example, if a conveyor suddenly becomes more heavily loaded, open-loop motor operation may result in speed changes.

A feedback arrangement allows the control system to detect the actual motor speed and compensate appropriately.

Applications where feedback can be especially valuable include:

• Roll drives
• Printing
• Textile machinery
• Feed systems
• Precision production equipment
• Speed-sensitive processes

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41. Typical Industrial Control Architecture

A typical system can be organized as:

PLC / Machine Controller → Drive Control I/O → DC Drive → DC Motor → Mechanical Load

A feedback device may provide:

Motor → Tachometer / Encoder → Drive

This arrangement allows the drive to handle motor-control functions while the higher-level controller manages the machine process.

The architecture is particularly useful when the existing machine already uses a PLC and conventional hardwired control signals.

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42. Installation and Cabinet Requirements

The IP20 enclosure means the drive should be installed inside an appropriate protected electrical environment.

Cabinet design should consider:

• Drive dimensions
• Mounting holes
• Cable-entry location
• Power wiring
• Control wiring
• Feedback wiring
• Ventilation
• Heat dissipation
• Maintenance clearance
• Grounding
• Service access

The approximate drive dimensions are:

425 mm height × 279 mm width × 425 mm depth

The approximate weight is:

14.2 kg

The cabinet should therefore provide sufficient structural support and adequate clearance beyond the drive’s physical envelope.

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43. Environmental Considerations

The conformal-coated construction provides additional protection to the electronics, but the installation still needs appropriate environmental control.

Avoid exposing the drive directly to:

• Water
• Condensation
• Conductive dust
• Excessive oil mist
• Corrosive contaminants
• Extreme ambient conditions
• Mechanical vibration beyond the applicable limits

The enclosure and cabinet ventilation should be selected according to the installation environment.

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44. Maintenance Considerations

A DC drive system should be inspected periodically, particularly in older industrial equipment.

Useful maintenance checks include:

• Cooling airflow
• Fan condition
• Electrical connections
• Cable insulation
• Motor brushes
• Motor commutator condition
• Feedback device
• Field circuit
• Armature circuit
• Grounding
• Cabinet contamination
• Fault history

The condition of the DC motor itself is just as important as the condition of the drive.

Replacing a drive without checking the motor can result in recurring failures if the underlying motor problem remains.

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45. Replacement Selection Checklist

Before selecting the 20P21AD027RA0NNN as a replacement, the following should be checked.

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46. Model Comparison by Current Rating

The PowerFlex DC family offers a range of current ratings.

This makes it relatively straightforward to select a model according to motor size.

The 27 A / 15 HP configuration is therefore a logical choice when the 19 A / 10 HP model is insufficient but the application does not yet require the larger 35 A / 20 HP configuration.

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47. Main Advantages at a Glance

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48. Five Related Models — Quick Selection Table

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49. Product Positioning

The 20P21AD027RA0NNN sits in the medium-power section of the PowerFlex DC range.

It is larger than the 5 HP, 7.5 HP, and 10 HP configurations and smaller than the 20 HP, 25 HP, and 30 HP configurations.

This gives it a useful balance between:

• Motor capacity
• Current capability
• Cabinet space
• Retrofit practicality
• Control flexibility
• Industrial application range

For a machine with a 15 HP DC motor and a conventional non-regenerative load, the 27 A configuration is a natural fit when the motor nameplate requirements are compatible.

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50. Direct Replacement Considerations

When replacing an older DC drive, it is important to compare more than the catalog number.

The following items should be matched:

1. Motor armature voltage

The drive must be appropriate for the motor’s armature voltage.

2. Motor armature current

The motor’s rated current should be compatible with the 27 A drive rating.

3. Field voltage

The field supply must match the motor.

4. Field current

The field current should be within the drive’s permitted range.

5. Feedback

The existing tachometer or encoder should be evaluated for compatibility.

6. Regenerative requirements

If the machine frequently decelerates a high-inertia load, a regenerative configuration may be more appropriate.

7. Cabinet space

The physical dimensions and required clearances should be checked.

8. Control architecture

The existing PLC, analog signals, digital signals, and communication requirements should be reviewed.

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51. Overall Product Assessment

The 20P21AD027RA0NNN is a capable 15 HP / 11 kW, 27 A industrial DC drive intended for applications requiring controlled operation of compatible DC motors.

Its main strengths are its relatively high 27 A armature capacity, three-phase 480 VAC-class input, regulated field supply, two-quadrant operation, feedback capability, flexible I/O, conformal coating, and compact Frame A construction.

It is especially suitable for industrial retrofit applications where an existing DC motor remains mechanically and electrically serviceable.

The drive can be used in many applications where controlled motor speed is important, including conveyors, rollers, feeders, printing machinery, textile equipment, paper processing, machine tools, and general industrial production equipment.

The non-regenerative design makes it particularly suitable for conventional motoring applications.

If the machine has significant regenerative energy during deceleration, the corresponding regenerative configuration should be considered instead.

The 27 A rating is the key differentiator from smaller models in the same family.

A 19 A / 10 HP model may be sufficient for a smaller motor, while a 35 A / 20 HP model may be more appropriate for a larger motor.

For an application requiring approximately 15 HP and 27 A but also requiring regenerative braking, the related regenerative configuration is the more appropriate direction.

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52. Final Detailed Specification Table

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53. Final Summary

The 20P21AD027RA0NNN is a 15 HP / approximately 11 kW PowerFlex DC drive with a 27 A armature rating, designed for controlled operation of compatible DC motors in industrial environments.

Its 480 VAC-class, three-phase input, six-pulse configuration, regulated single-phase field supply, and two-quadrant non-regenerative operation make it well suited to conventional DC motor applications.

The drive is particularly useful where an existing machine already uses a DC motor and the goal is to maintain the existing mechanical architecture while upgrading or replacing the electronic motor controller.

Its IP20 / NEMA/UL Type Open enclosure, Frame A construction, conformal coating, and air-cooled design are appropriate for installation inside a suitable industrial control cabinet.

The approximate physical size is 425 × 279 × 425 mm, with an approximate weight of 14.2 kg.

The most suitable applications include industrial conveyors, roll drives, feeders, printing equipment, textile machinery, paper-processing systems, machine tools, material-handling equipment, and general production machinery.

The principal selection point is the 27 A armature rating. The motor’s actual armature current should be checked carefully before selecting the drive.

For lower-power requirements, the 20P21AD019RA0NNN is a logical related model.

For higher-power requirements, the 20P21AD035RA0NNN and 20P21AD045RA0NNN provide additional current capacity.

For applications requiring regenerative braking or four-quadrant operation, the 20P41AD027RA0NNN is the more relevant related configuration.

For complete machine modernization, AC-drive products can also be considered, but they should not be regarded as direct electrical replacements because they normally require an appropriate AC motor and potentially changes to the machine’s feedback, wiring, control, and mechanical arrangements.

In short, the 20P21AD027RA0NNN is a strong 15 HP-class industrial DC drive choice for medium-sized machinery where 27 A armature capacity, controlled speed and torque, conventional two-quadrant operation, and compatibility with an existing DC motor are the primary requirements.