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Allen-Bradley 20F1AND477AN0NNNNN — Detailed Product Specifications, Introduction, Applications, Advantages and Model Selection Guide

1. Product Overview

The Allen-Bradley 20F1AND477AN0NNNNN is a high-power PowerFlex 753 AC variable frequency drive designed for large three-phase industrial motors.

This model belongs to the high-capacity range of the PowerFlex 753 family and is intended for demanding industrial applications where conventional low-power drives are not sufficient.

The drive provides a 477 A output-current rating, with a 400 HP normal-duty rating and a 300 HP heavy-duty rating at the 480 VAC class.

In metric terms, the 400 HP normal-duty rating is approximately 298 kW, while the 300 HP heavy-duty rating is approximately 224 kW.

The drive uses a Frame 7 construction and forced-air cooling, making it suitable for large industrial motor-control systems that require substantial power-handling capability.

The exact 20F1AND477AN0NNNNN configuration includes embedded I/O, AC input with precharge, no DC terminals, open-type construction, EMC filtering, no internal dynamic-braking transistor, and a blank/no-HIM configuration.

One important characteristic of this particular model is its A-series configuration. It should not simply be treated as interchangeable with a similar-looking J-series catalog number.

The exact catalog configuration should always be considered when replacing or upgrading an existing drive because filtering, common-mode capacitor configuration, braking configuration and other catalog options can differ.

The model is particularly suitable for large pumps, fans, blowers, conveyors, compressors, mixers, material-handling equipment and other large industrial machines.

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2. Brand and Series

Category	Specification
Brand	Allen-Bradley
Product Family	PowerFlex
Series	PowerFlex 753
Product Type	AC Variable Frequency Drive
Product Category	High-Power Industrial AC Drive
Voltage Class	480 VAC
Input Phase	Three Phase
Frame	Frame 7
Cooling	Forced Air
Enclosure	IP20/IP00 / Open Type
Normal-Duty Rating	400 HP
Heavy-Duty Rating	300 HP
Output Current	477 A
Input Configuration	AC Input with Precharge
DC Terminals	No
Dynamic Braking	None
HIM	Blank / No HIM

The PowerFlex 753 family is designed for industrial variable-speed motor control.

It provides a scalable platform for applications ranging from pumps and fans to conveyors, process equipment and large production machinery.

The 20F1AND477AN0NNNNN is positioned toward the upper end of the standard high-power 753 range, making it appropriate for very large motors and high-capacity mechanical systems.

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3. Product Identification

Parameter	Specification
Model	20F1AND477AN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 753
Product Type	AC Variable Frequency Drive
Input Voltage Class	480 VAC
Input Voltage Range	380–480 VAC
Input Phase	3 Phase
Input Frequency	50/60 Hz
Output Current	477 A
Normal-Duty Power	400 HP
Heavy-Duty Power	300 HP
Normal-Duty Power	Approx. 298 kW
Heavy-Duty Power	Approx. 224 kW
Frame	7
Cooling	Forced Air
Enclosure	IP20/IP00
Enclosure Type	NEMA/UL Open Type
Input Type	AC Input with Precharge
DC Terminals	No
Filtering	EMC Filter
CM Configuration	CM Jumper Removed
Dynamic Braking	None
Internal Braking Transistor	No
Embedded I/O	Yes
HIM	Blank / No HIM
Approx. Height	881.5 mm
Approx. Width	430 mm
Approx. Depth	349.6 mm
Dimensions	Approx. 881.5 × 430 × 349.6 mm
Weight	Approx. 124.7 kg

The physical dimensions and weight are suitable reference values for equipment planning.

Because this is a large Frame 7 drive, additional cabinet space must be provided around the drive for power wiring, cooling airflow, cable bending radius, inspection and maintenance.

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4. Main Electrical Parameters

Electrical Parameter	Specification
Model	20F1AND477AN0NNNNN
Input Voltage	380–480 VAC
Nominal Voltage	480 VAC
Input Phase	3 Phase
Input Frequency	50/60 Hz
Output Current	477 A
Normal-Duty Current Class	477 A
Heavy-Duty Current Class	Approx. 361 A
Normal-Duty Rating	400 HP
Heavy-Duty Rating	300 HP
Normal-Duty Power	Approx. 298 kW
Heavy-Duty Power	Approx. 224 kW
Frame	7
Cooling	Forced Air
Input	AC with Precharge
DC Terminals	No
Filtering	EMC Filter
CM Jumper	Removed
Dynamic Braking	None
Embedded I/O	Yes
HIM	Blank / No HIM

The most important specification is the 477 A output-current capability.

This gives the drive a substantial capacity for large three-phase AC motors.

When selecting the drive, however, the motor nameplate current should remain one of the primary selection criteria.

Horsepower provides a useful initial reference, but the motor’s actual full-load current, torque requirements and duty cycle determine whether the drive is appropriately sized.

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5. 400 HP Normal-Duty Capability

The 20F1AND477AN0NNNNN provides a 400 HP normal-duty rating.

This corresponds to approximately:

400 HP ≈ 298 kW

This makes the drive particularly suitable for large variable-torque loads.

Typical examples include:

• Large centrifugal pumps
• Large industrial fans
• Cooling-water pumps
• Large blowers
• Ventilation systems
• Water-treatment equipment
• Process-fluid systems
• Large utility equipment

For applications where the motor spends most of its time operating under variable-torque conditions, the 400 HP normal-duty rating provides substantial capacity.

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6. 300 HP Heavy-Duty Capability

The drive provides a 300 HP heavy-duty rating.

This is approximately:

300 HP ≈ 224 kW

Heavy-duty applications generally require greater overload capability because the motor may experience higher torque requirements, demanding acceleration, sudden load changes or more severe operating conditions.

Potential heavy-duty applications include:

• Large conveyors
• Material-handling equipment
• Mixers
• Agitators
• Heavy process machinery
• High-inertia machinery
• Certain compressor systems
• Large production machines

The 300 HP heavy-duty rating makes this drive considerably more versatile than a drive selected solely for variable-torque loads.

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7. 477 A Output Current

The 477 A output rating is the defining electrical characteristic of this model.

A current rating at this level places the drive firmly in the large industrial equipment category.

It can be used for motors requiring substantial electrical power, particularly where the motor operates on a 480 VAC three-phase supply.

Before installation, the following motor information should be checked carefully:

Motor Parameter	Importance
Rated Voltage	Must be compatible with the drive
Full-Load Current	Primary drive-sizing reference
Rated Power	Confirms approximate drive class
Rated Frequency	Required for drive configuration
Rated Speed	Important for motor-control setup
Rated Torque	Important for application matching
Starting Torque	Important for heavy-duty applications
Motor Type	Determines appropriate control strategy
Duty Cycle	Determines overload requirements
Acceleration Time	Determines starting behavior
Deceleration Time	Determines braking requirements
Load Inertia	Important for acceleration/deceleration
Cable Length	Important for installation and motor protection

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8. 480 VAC Three-Phase Operation

The drive is intended for the 480 VAC three-phase industrial voltage class.

The applicable input class is approximately 380–480 VAC.

Three-phase 480 VAC systems are widely used for high-power industrial motors because they allow substantial motor power to be delivered efficiently without the extremely high current levels that would be required at lower voltages.

This makes the drive appropriate for:

• Industrial water systems
• Large pumps
• Cooling systems
• Large fans
• Blowers
• Conveyors
• Process machinery
• Compressors
• Material-handling systems
• Production equipment

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9. Frame 7 Construction

The 20F1AND477AN0NNNNN uses a Frame 7 mechanical design.

Frame 7 provides a large physical platform for the power electronics, cooling system, terminals and associated drive components required for high-current operation.

Mechanical Parameter	Specification
Model	20F1AND477AN0NNNNN
Frame	7
Height	Approx. 881.5 mm
Width	Approx. 430 mm
Depth	Approx. 349.6 mm
Dimensions	Approx. 881.5 × 430 × 349.6 mm
Weight	Approx. 124.7 kg
Cooling	Forced Air
Enclosure	IP20/IP00
Construction	Open Type
Installation	Cabinet / Panel

The drive is a substantial piece of electrical equipment.

A suitable cabinet structure, mounting arrangement and lifting procedure should therefore be considered during project design.

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10. Dimensions and Weight

The approximate overall dimensions are:

881.5 mm × 430 mm × 349.6 mm

The approximate weight is:

124.7 kg

Mechanical Specification	Value
Model	20F1AND477AN0NNNNN
Height	881.5 mm
Width	430 mm
Depth	349.6 mm
Overall Dimensions	881.5 × 430 × 349.6 mm
Weight	124.7 kg
Frame	7
Cooling	Forced Air
Enclosure	IP20/IP00
Mounting	Cabinet / Panel

The cabinet should provide additional room beyond the basic dimensions.

Clearance is needed for power terminals, motor connections, control wiring, ventilation and maintenance.

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11. Open-Type Construction

The drive uses an open-type IP20/IP00 configuration.

It is therefore intended to be installed inside a properly designed electrical cabinet or other protected industrial enclosure.

The drive should be protected against:

• Water
• Condensation
• Excessive dust
• Conductive contamination
• Metal particles
• Oil mist
• Corrosive gases
• Mechanical impact
• Excessive humidity

The final enclosure selection depends on the actual environment in which the drive will operate.

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12. Forced-Air Cooling

The drive uses forced-air cooling.

Thermal management is particularly important because the drive is capable of delivering up to 477 A.

The cabinet must provide sufficient airflow and prevent hot exhaust air from circulating back into the drive’s intake path.

Important thermal factors include:

• Ambient temperature
• Cabinet temperature
• Cooling airflow
• Fan condition
• Air-filter condition
• Adjacent equipment heat
• Cabinet ventilation
• Drive spacing
• Installation altitude
• Maintenance condition

For installations containing several high-power drives, the total cabinet heat load should be calculated rather than considering each drive independently.

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13. AC Input with Precharge

The 20F1AND477AN0NNNNN uses an AC input with precharge configuration.

Precharge controls the initial charging of the drive’s internal DC-link capacitors when the drive is energized.

This is particularly important in high-power drives because uncontrolled capacitor charging can produce very large initial current demands.

The precharge arrangement is therefore an important part of the drive’s high-power AC-input architecture.

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14. No DC Terminals

The exact configuration has no DC terminals.

This means the drive is configured primarily for conventional AC-fed motor applications rather than systems that require direct access to a common DC bus.

A typical installation can therefore be represented as:

Three-Phase AC Supply → AC Drive → Three-Phase Motor

For applications involving common DC bus architectures or regenerative systems, another configuration may be more appropriate.

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15. EMC Filter Configuration

The 20F1AND477AN0NNNNN includes an EMC filter configuration.

Electromagnetic compatibility is important in industrial automation because variable frequency drives generate high-frequency switching activity that can affect nearby electrical equipment if the overall installation is not properly designed.

Potentially sensitive equipment includes:

• PLC systems
• HMI panels
• Sensors
• Instrumentation
• Communication equipment
• Industrial computers
• Other drives
• Measurement equipment

The drive’s filter configuration is one part of the overall EMC design.

Correct grounding, cable shielding and cable routing remain important.

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16. CM Jumper Configuration

The exact A-series configuration uses a removed CM jumper configuration.

This is an important distinction when comparing the model with similar PowerFlex 753 versions.

The common-mode capacitor configuration can influence how the drive interacts with the grounding system and the electrical environment.

Therefore, when replacing a drive, the complete catalog number and its configuration should be checked rather than assuming that a similar current-rated model has identical internal configuration.

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17. Dynamic Braking

The exact 20F1AND477AN0NNNNN configuration has:

Dynamic Braking: None

It does not include an internal dynamic-braking transistor.

This point is especially important for applications with substantial regenerative energy.

Examples include:

• High-inertia machinery
• Large conveyors
• Rapid deceleration systems
• Centrifuges
• Heavy rotating machinery
• Large rollers
• High-speed production equipment

If rapid stopping is required, the braking strategy should be evaluated separately.

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18. Embedded I/O

The model includes embedded I/O.

Embedded I/O can simplify basic control and monitoring connections between the drive and the machine-control system.

Typical signals in a drive application can include:

• Start
• Stop
• Enable
• Speed reference
• Fault status
• Drive status
• Analog feedback
• Digital inputs
• Digital outputs
• Process signals

For larger automation systems, additional communication and I/O capabilities can be incorporated according to the control architecture.

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19. Blank HIM Configuration

The model is supplied with a:

Blank / No HIM

configuration.

This means a local human-interface module is not included in the standard configuration.

This can be advantageous in automated installations where the drive is controlled remotely through:

• PLCs
• HMIs
• Industrial networks
• Supervisory systems
• Remote control stations
• Centralized control rooms

If local operator interaction is required, a suitable interface can be selected separately.

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20. Product Introduction

The Allen-Bradley 20F1AND477AN0NNNNN is designed for large industrial motor-control applications where variable-speed operation is required.

Large motors are often used in systems where operating continuously at full speed is unnecessary.

A variable frequency drive allows the motor speed to be adjusted according to the process requirement.

For example, a large pump may operate at reduced speed during periods of low demand.

A large fan may reduce speed when ventilation requirements decrease.

A conveyor can accelerate smoothly rather than applying full mechanical force immediately.

A mixer can use several different operating speeds during a production cycle.

A blower can adjust its speed to maintain a pressure or airflow setpoint.

The 20F1AND477AN0NNNNN provides the current and power capacity required for these large-scale applications.

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21. Main Product Advantages

21.1 Very High 477 A Output Capacity

The 477 A output rating makes this model suitable for very large industrial motors.

It provides considerably more current capacity than the smaller 248 A, 302 A, 361 A and 415 A classes.

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21.2 400 HP Normal-Duty Rating

The 400 HP normal-duty capability places the drive in a high-power industrial category.

This makes it particularly attractive for large variable-torque systems.

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21.3 300 HP Heavy-Duty Rating

The 300 HP heavy-duty rating provides considerable capability for applications with demanding torque requirements.

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21.4 480 VAC Compatibility

The 480 VAC three-phase class is well suited to high-power industrial motor systems.

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21.5 Frame 7 Platform

Frame 7 provides the physical platform needed for this high-current drive.

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21.6 Embedded I/O

Embedded I/O simplifies basic machine integration.

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21.7 Forced-Air Cooling

Forced-air cooling provides an effective thermal-management approach for high-power operation.

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21.8 EMC Filtering

The EMC filter configuration supports integration into industrial electrical environments where electromagnetic compatibility is an important consideration.

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21.9 AC Input with Precharge

The precharge arrangement is appropriate for the high-power internal DC-link architecture.

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21.10 Flexible Cabinet Integration

The open-type design makes the drive suitable for integration into larger electrical cabinets designed around the machine or process.

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22. Large Pump Applications

Large pumps are one of the most common applications for high-power variable frequency drives.

A pump does not necessarily need to operate at full speed continuously.

The drive can adjust motor speed according to:

• Flow
• Pressure
• Tank level
• Process demand
• Cooling requirements
• Water demand
• Production conditions

Potential applications include:

• Industrial water circulation
• Water treatment
• Cooling-water systems
• Process-fluid transfer
• Industrial utilities
• Pumping stations
• Pressure systems

For suitable centrifugal pumps, reducing speed can provide substantial energy-saving opportunities compared with continuously operating the pump at full speed.

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23. Large Fan Applications

Large industrial fans can consume significant amounts of power.

The drive allows fan speed to be adjusted according to actual ventilation requirements.

Potential control variables include:

• Airflow
• Static pressure
• Temperature
• Furnace conditions
• Production requirements
• Ventilation demand

Applications include:

• Industrial ventilation
• Furnace exhaust
• Dust collection
• Process ventilation
• Large cooling systems
• Factory ventilation
• Mining ventilation

The drive can provide controlled acceleration and deceleration while allowing the fan to operate at different speeds.

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24. Large Blower Applications

Large blowers often require variable airflow or pressure.

The drive can adjust blower speed based on actual process demand.

Typical applications include:

• Aeration
• Industrial air systems
• Process gas handling
• Dust collection
• Ventilation
• Pneumatic processes
• Industrial combustion systems

Variable-speed operation can provide better process control than simply switching a blower between on and off states.

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25. Conveyor Applications

Large conveyors can have significant inertia and mechanical loading.

The 20F1AND477AN0NNNNN can provide controlled acceleration rather than immediately applying full-speed operation.

This can reduce mechanical shock on:

• Conveyor belts
• Gearboxes
• Couplings
• Shafts
• Bearings
• Rollers
• Structural components

Large conveyor systems may also require controlled deceleration.

Because the exact model has no internal dynamic-braking transistor, the complete stopping and braking requirements should be evaluated during system design.

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26. Material-Handling Applications

Large material-handling machines can require substantial motor power.

Potential applications include:

• Bulk-material conveyors
• Transfer systems
• Feed systems
• Production conveyors
• Mining machinery
• Processing systems
• Material transport equipment

The 477 A output capability provides a substantial power margin for large industrial material-handling systems.

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27. Compressor Applications

Large compressors can require high motor power and controlled acceleration.

Variable-speed control can provide:

• Controlled startup
• Adjustable operating speed
• Pressure regulation
• Reduced mechanical shock
• Flexible production control
• Improved process matching

The actual compressor torque curve should be evaluated because different compressor technologies can have very different starting and operating requirements.

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28. Mixer and Agitator Applications

Large mixers and agitators can require high starting torque.

The material inside the vessel may also change viscosity during the process.

A variable frequency drive can provide different operating speeds throughout the process.

A typical cycle might include:

Low-Speed Loading → Controlled Acceleration → Mixing → High-Speed Processing → Controlled Reduction → Stopping

This can provide much greater process flexibility than fixed-speed motor operation.

For demanding mixers, the 300 HP heavy-duty rating should be compared with the actual motor current and torque requirements.

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29. Process Machinery Applications

The drive can serve as the motor-control element of a large process machine.

Potential applications include:

• Industrial production equipment
• Process pumps
• Large fans
• Blowers
• Conveyors
• Mixers
• Agitators
• Cooling systems
• Material-processing equipment
• Large machine tools
• Utility equipment

The drive can operate as part of a larger control architecture involving PLCs, HMIs, sensors and industrial networks.

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30. PID Process Control

The drive can participate in process-control applications using PID control.

For example:

Pressure Control

A pump can change speed to maintain a pressure setpoint.

Airflow Control

A fan or blower can adjust speed according to airflow demand.

Tank-Level Control

A pump can respond to changing liquid level.

Process Regulation

A motor can adjust speed according to a process variable.

A simplified control loop is:

Sensor → Process Feedback → PID Controller → Drive Speed Reference → Motor → Process

This approach is particularly useful in pumps, fans, blowers and other variable-torque applications.

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31. Industrial Automation Integration

The PowerFlex 753 platform can be integrated into industrial automation systems.

A typical architecture can include:

• PLC
• HMI
• PowerFlex drive
• Motor
• Sensors
• Communication network
• Safety equipment
• Process instrumentation

The drive can exchange information such as:

• Start command
• Stop command
• Speed reference
• Actual operating speed
• Output current
• Drive status
• Warning status
• Fault information
• Process information

This makes the drive suitable for centralized control and monitoring in large production facilities.

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32. Energy-Saving Applications

Variable-speed control can provide significant energy-saving opportunities when applied to suitable loads.

The most attractive applications are often:

• Centrifugal pumps
• Centrifugal fans
• Blowers
• Cooling systems
• Water circulation systems

For these applications, reducing motor speed can significantly reduce power demand.

The actual energy savings depend on the machine, operating profile, system resistance and required process output.

The drive provides the control capability; the overall mechanical and process system determines the final energy performance.

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33. Cabinet Design

Because the 20F1AND477AN0NNNNN is a large Frame 7 open-type drive, cabinet design is an important part of the installation.

The approximate drive dimensions are:

881.5 × 430 × 349.6 mm

The approximate weight is:

124.7 kg

The cabinet should provide additional space for:

• Input power cables
• Motor cables
• Cable bending radius
• Control wiring
• Grounding
• Ventilation
• Communication equipment
• Service access
• Cooling fans
• Maintenance

The cabinet structure should also be designed to support the weight safely.

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34. Thermal Design

The high-current capacity of this drive means that thermal management must be considered carefully.

The forced-air cooling system requires adequate airflow.

A poorly ventilated cabinet can cause internal temperature to rise beyond acceptable levels.

The thermal design should consider:

• Ambient temperature
• Internal cabinet temperature
• Drive heat loss
• Fan capacity
• Filter condition
• Airflow direction
• Adjacent equipment
• Cabinet size
• Installation altitude
• Maintenance requirements

When multiple large drives are installed in one cabinet, their combined heat load must be considered.

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35. Electrical Installation

Installation Parameter	Recommended Consideration
Input Voltage	380–480 VAC
Nominal Voltage	480 VAC
Input Phase	Three Phase
Output Current	477 A
Normal-Duty Rating	400 HP
Heavy-Duty Rating	300 HP
Cooling	Forced Air
Enclosure	IP20/IP00 Open Type
Cabinet	Protected installation
Dynamic Braking	None internally
Motor Cable	Properly sized
Grounding	Proper protective grounding
EMC	Proper cable routing and grounding
Upstream Protection	Properly engineered
Thermal Design	Adequate cabinet cooling
Service Access	Adequate clearance

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36. Motor Selection Guidelines

The correct motor should be selected based on actual nameplate information.

Motor Parameter	Importance
Rated Voltage	Must match the drive class
Full-Load Current	Primary drive-sizing parameter
Motor Power	Confirms general capacity
Rated Frequency	Required for motor setup
Rated Speed	Important for control
Rated Torque	Important for load matching
Starting Torque	Important for heavy-duty loads
Duty Cycle	Determines operating requirements
Service Factor	Useful during evaluation
Motor Type	Determines control requirements
Feedback	Required for some applications
Load Inertia	Important for acceleration/deceleration
Cable Length	Important for installation
Operating Environment	Important for motor selection

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37. Normal-Duty and Heavy-Duty Application Guide

Application	Typical Duty
Large Centrifugal Pump	Normal Duty
Large Centrifugal Fan	Normal Duty
Large Cooling Fan	Normal Duty
Large Blower	Normal Duty
Water Circulation System	Normal Duty
Large Conveyor	Heavy Duty / Application Specific
Material Handling	Heavy Duty / Application Specific
Mixer	Heavy Duty / Application Specific
Agitator	Heavy Duty / Application Specific
Compressor	Application Specific
High-Inertia Machinery	Application Specific
Process Machine	Application Specific

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38. Braking Considerations

Because this exact configuration does not include an internal dynamic-braking transistor, braking requirements should be reviewed carefully for machines that decelerate frequently.

Application	Braking Consideration
Large Pump	Usually moderate
Large Fan	Usually moderate
Large Blower	Application dependent
Conveyor	Detailed stopping analysis
Heavy Conveyor	Braking system may be required
High-Inertia Machine	Detailed regenerative-energy analysis
Centrifuge	Strong braking consideration
Mixer	Depends on inertia
Material Handling	Application dependent
Rapid-Stop Machine	Detailed braking architecture required

The drive can still be used in systems requiring controlled deceleration, but the appropriate braking architecture must be selected according to the actual mechanical energy involved.

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39. Five Recommended Same-Series or Related Models

The following models provide useful comparison points when selecting a high-power PowerFlex drive.

Model	Voltage	ND Current	HD Current	ND Power	HD Power	Frame	Approx. Dimensions	Approx. Weight
20F1AND302AN0NNNNN	480 V	302 A	248 A	250 HP	200 HP	7	Approx. 882 × 430 × 350 mm	Approx. 56.7 kg
20F1AND361AN0NNNNN	480 V	361 A	302 A	300 HP	250 HP	7	Approx. 882 × 430 × 350 mm	Approx. 56.7 kg
20F1AND415AN0NNNNN	480 V	415 A	361 A	350 HP	300 HP	7	Approx. 882 × 430 × 350 mm	Approx. 124.7 kg
20F1AND477JN0NNNNN	480 V	477 A	361 A	400 HP	300 HP	7	Approx. 882 × 430 × 350 mm	Approx. 124.7 kg
20F1AND477AN0NNNNN	480 V	477 A	361 A	400 HP	300 HP	7	Approx. 881.5 × 430 × 349.6 mm	Approx. 124.7 kg

The 20F1AND477AN0NNNNN and 20F1AND477JN0NNNNN have the same basic 477 A / 400 HP normal-duty / 300 HP heavy-duty power class, but their catalog configurations are not identical.

The exact A-series configuration should therefore be maintained when replacing an existing A-series drive unless the complete electrical and application configuration has been reviewed.

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40. Same-Series Capacity Comparison

Model	ND Current	HD Current	ND HP	HD HP	Frame	Approx. Weight
20F1AND302AN0NNNNN	302 A	248 A	250 HP	200 HP	7	Approx. 56.7 kg
20F1AND361AN0NNNNN	361 A	302 A	300 HP	250 HP	7	Approx. 56.7 kg
20F1AND415AN0NNNNN	415 A	361 A	350 HP	300 HP	7	Approx. 124.7 kg
20F1AND477AN0NNNNN	477 A	361 A	400 HP	300 HP	7	Approx. 124.7 kg
20F1AND477JN0NNNNN	477 A	361 A	400 HP	300 HP	7	Approx. 124.7 kg

The 20F1AND477AN0NNNNN represents the highest normal-duty current level in this comparison group.

Its 477 A capacity provides a clear step above the 415 A class.

It is therefore appropriate when the motor requirement approaches the 400 HP normal-duty range.

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41. Five Same-Brand Popular Models

The following models provide useful alternatives or comparison points within the broader Allen-Bradley variable-frequency-drive portfolio.

Model	Series	Voltage Class	Power Class	Current Class	Typical Application	Dimensions	Weight
20F1AND477AN0NNNNN	PowerFlex 753	480 V	400 HP ND / 300 HP HD	477 A	Very large industrial motors	881.5 × 430 × 349.6 mm	124.7 kg
20F1AND415AN0NNNNN	PowerFlex 753	480 V	350 HP ND / 300 HP HD	415 A	Large pumps, fans, conveyors	Approx. 882 × 430 × 350 mm	Approx. 124.7 kg
20F1AND361AN0NNNNN	PowerFlex 753	480 V	300 HP ND / 250 HP HD	361 A	Large industrial machinery	Approx. 882 × 430 × 350 mm	Approx. 56.7 kg
20G1AND477JN0NNNNN	PowerFlex 755	480 V class	400 HP class	477 A class	Advanced high-power control	Frame-dependent	Frame-dependent
25B-D024N114	PowerFlex 525	480 V class	Lower-power class	Medium current	Compact industrial equipment	Compact	Approx. 7–10 kg

These models cover substantially different application categories.

The PowerFlex 525 family is better suited to compact and lower-power machinery.

The PowerFlex 753 family is intended for larger industrial motor-control systems.

The PowerFlex 755 family provides a stronger option for applications requiring more advanced control, feedback and system-integration capabilities.

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42. PowerFlex 753 and PowerFlex 755 Comparison

Characteristic	20F1AND477AN0NNNNN	PowerFlex 755 Class
Series	PowerFlex 753	PowerFlex 755
Application Position	High-Power General Industrial Drive	Advanced Industrial Drive
Voltage	480 V class	Multiple voltage classes
Power Capability	Very High	High to Very High
Typical Loads	Pumps, fans, conveyors, process machinery	Advanced machinery and demanding processes
Embedded I/O	Yes	Extensive expansion capability
Feedback	Option-based	Broad feedback capability
Communication	Option-based	Broad communication capability
Safety	Application dependent	Extensive safety architecture
Main Strength	High-power general-purpose control	Advanced motor and machine control

For large but relatively straightforward motor applications, the PowerFlex 753 platform can be a practical choice.

For applications requiring more sophisticated motor feedback, advanced control or extensive system integration, the PowerFlex 755 family may be considered.

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43. Advantages in Pump Systems

The 400 HP normal-duty rating makes the 20F1AND477AN0NNNNN particularly attractive for large pump systems.

The drive can adjust motor speed according to actual system demand.

For example:

Low Demand → Reduced Speed

Medium Demand → Moderate Speed

High Demand → Higher Speed

This can improve process control and potentially reduce energy consumption.

Applications include:

• Cooling-water systems
• Industrial water supply
• Process-fluid circulation
• Water treatment
• Pumping stations
• Large production facilities

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44. Advantages in Fan and Ventilation Systems

Large ventilation systems often operate under changing conditions.

The drive can allow fan speed to respond to:

• Temperature
• Airflow
• Pressure
• Production requirements
• Furnace conditions
• Building conditions

This provides more flexibility than fixed-speed operation.

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45. Advantages in Conveyor Systems

For large conveyors, controlled acceleration can reduce mechanical shock.

The drive can be configured to increase motor speed gradually.

This can help protect:

• Belts
• Gearboxes
• Couplings
• Bearings
• Shafts
• Mechanical structures

The application must also consider deceleration energy because this exact model does not include an internal dynamic-braking transistor.

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46. Advantages in Large Process Systems

Large process systems often require continuous operation with stable speed control.

The drive can provide:

• Adjustable speed
• Controlled acceleration
• Controlled deceleration
• Process feedback
• PID regulation
• Fault monitoring
• Integration with automation systems

This makes it suitable for large production and utility systems.

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47. Advantages for Motor Starting

Starting a large motor directly across the line can produce high starting current and mechanical shock.

A variable frequency drive can gradually increase motor frequency and voltage according to a programmed acceleration profile.

This can provide smoother starting behavior.

Potential benefits include:

• Lower mechanical shock
• Reduced belt stress
• Reduced gearbox stress
• Reduced coupling stress
• Better process control
• Controlled acceleration

For large industrial motors, controlled starting can be a major advantage.

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48. Advantages for Process Flexibility

A fixed-speed motor has limited speed flexibility.

A variable frequency drive turns motor speed into a controllable process parameter.

For example:

Process Stage	Possible Motor Operation
Loading	Low Speed
Initial Processing	Moderate Speed
Main Production	High Speed
Fine Adjustment	Reduced Speed
Discharge	Low Speed
Stop	Controlled Deceleration

This flexibility can be valuable in mixers, conveyors, pumps, fans and process machinery.

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49. Maintenance Considerations

A large Frame 7 drive requires an appropriate maintenance strategy.

Maintenance activities can include inspection of:

• Cooling fans
• Air passages
• Electrical connections
• Power terminals
• Control wiring
• Grounding
• Cabinet ventilation
• Air filters
• Signs of overheating
• Dust accumulation
• Communication connections

Maintaining adequate airflow is particularly important for a forced-air-cooled high-power drive.

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50. Environmental Considerations

The open-type design means the drive should be installed in a suitable protected environment.

The installation should be evaluated for:

• Ambient temperature
• Humidity
• Condensation
• Dust
• Conductive contamination
• Oil mist
• Corrosive substances
• Vibration
• Altitude
• Cooling-air quality

A clean electrical room is generally much easier to manage than a heavily contaminated industrial environment.

Where the environment is dusty or corrosive, the cabinet and cooling system should be designed accordingly.

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51. Product Selection Checklist

Before selecting the 20F1AND477AN0NNNNN, verify:

Selection Item	Requirement
Motor Voltage	Compatible with 480 V class
Motor Current	Within applicable drive rating
Motor Power	Up to 400 HP ND class
Heavy-Duty Power	Up to 300 HP HD class
Load Type	Determine ND/HD requirement
Acceleration	Evaluate starting requirement
Deceleration	Evaluate braking requirement
Dynamic Braking	No internal DB transistor
EMC	Confirm filtering and grounding requirements
Cabinet	Adequate size and structural strength
Cooling	Adequate forced-air ventilation
Environment	Suitable protected environment
Motor Cable	Correctly sized
Grounding	Properly engineered
Communication	Select required architecture
Feedback	Add if application requires it
Safety	Evaluate complete machine system

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52. Complete Technical Parameter Table

Category	Parameter	Specification
Product	Model	20F1AND477AN0NNNNN
Product	Brand	Allen-Bradley
Product	Series	PowerFlex 753
Product	Product Type	AC Variable Frequency Drive
Product	Drive Type	Air-Cooled AC Drive
Electrical	Input Voltage	380–480 VAC
Electrical	Nominal Voltage	480 VAC
Electrical	Input Phase	3 Phase
Electrical	Input Frequency	50/60 Hz
Electrical	Output Current	477 A
Electrical	Normal-Duty Rating	400 HP
Electrical	Heavy-Duty Rating	300 HP
Electrical	Normal-Duty Power	Approx. 298 kW
Electrical	Heavy-Duty Power	Approx. 224 kW
Construction	Frame	7
Construction	Cooling	Forced Air
Construction	Enclosure	IP20/IP00
Construction	Enclosure Type	NEMA/UL Open Type
Input	Input Type	AC Input with Precharge
Input	DC Terminals	No
EMC	Filtering	EMC Filter
EMC	CM Jumper	Removed
Braking	Dynamic Braking	None
Braking	Internal Braking Transistor	No
Interface	Embedded I/O	Yes
Interface	HIM	Blank / No HIM
Control	Variable-Speed Operation	Yes
Control	PID Process Control	Supported
Mechanical	Height	Approx. 881.5 mm
Mechanical	Width	Approx. 430 mm
Mechanical	Depth	Approx. 349.6 mm
Mechanical	Dimensions	Approx. 881.5 × 430 × 349.6 mm
Mechanical	Weight	Approx. 124.7 kg
Installation	Mounting	Electrical Cabinet
Application	Motor Type	Three-Phase AC Motor
Application	Normal-Duty Class	400 HP
Application	Heavy-Duty Class	300 HP
Application	Typical Loads	Pumps, fans, blowers, conveyors, compressors
Cooling	Cooling Method	Forced Air
Enclosure	Environmental Protection	Requires Protected Installation
Braking	Braking Requirement	External solution may be required for demanding deceleration

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53. Five Same-Series Models — Detailed Comparison

Model	Voltage	ND Current	HD Current	ND HP	HD HP	Frame	Dimensions	Weight
20F1AND302AN0NNNNN	380–480 V	302 A	248 A	250 HP	200 HP	7	Approx. 882 × 430 × 350 mm	Approx. 56.7 kg
20F1AND361AN0NNNNN	380–480 V	361 A	302 A	300 HP	250 HP	7	Approx. 882 × 430 × 350 mm	Approx. 56.7 kg
20F1AND415AN0NNNNN	380–480 V	415 A	361 A	350 HP	300 HP	7	Approx. 882 × 430 × 350 mm	Approx. 124.7 kg
20F1AND477AN0NNNNN	380–480 V	477 A	361 A	400 HP	300 HP	7	Approx. 881.5 × 430 × 349.6 mm	Approx. 124.7 kg
20F1AND477JN0NNNNN	380–480 V	477 A	361 A	400 HP	300 HP	7	Approx. 882 × 430 × 350 mm	Approx. 124.7 kg

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54. Five Same-Brand Models — Detailed Comparison

Model	Series	Voltage Class	Normal-Duty Rating	Heavy-Duty Rating	Current Class	Typical Application	Dimensions	Weight
20F1AND477AN0NNNNN	PowerFlex 753	480 V	400 HP	300 HP	477 A	Large industrial motors	881.5 × 430 × 349.6 mm	124.7 kg
20F1AND415AN0NNNNN	PowerFlex 753	480 V	350 HP	300 HP	415 A	Large pumps and fans	Approx. 882 × 430 × 350 mm	Approx. 124.7 kg
20F1AND361AN0NNNNN	PowerFlex 753	480 V	300 HP	250 HP	361 A	Large industrial machinery	Approx. 882 × 430 × 350 mm	Approx. 56.7 kg
20G1AND477JN0NNNNN	PowerFlex 755	480 V class	400 HP class	300 HP class	477 A class	Advanced high-power applications	Frame-dependent	Frame-dependent
25B-D024N114	PowerFlex 525	480 V class	Lower-power class	Application dependent	Medium class	Compact machinery	Compact	Approx. 7–10 kg

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55. Recommended Model by Motor Power

Motor Requirement	Suggested Model	Reason
Around 250 HP	20F1AND302AN0NNNNN	250 HP normal-duty class
Around 300 HP	20F1AND361AN0NNNNN	300 HP normal-duty class
Around 350 HP	20F1AND415AN0NNNNN	350 HP normal-duty class
Around 400 HP	20F1AND477AN0NNNNN	400 HP normal-duty class
Around 400 HP with different configuration requirements	20F1AND477JN0NNNNN	Same 477 A / 400 HP class with different catalog configuration

The final selection should always be based on the actual motor full-load current and application duty rather than horsepower alone.

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56. Recommended Model by Application

Application	Recommended Model	Main Selection Reason
250 HP centrifugal pump	20F1AND302AN0NNNNN	Appropriate high-power variable-speed class
300 HP industrial fan	20F1AND361AN0NNNNN	300 HP normal-duty class
350 HP pump	20F1AND415AN0NNNNN	350 HP normal-duty capability
400 HP large fan	20F1AND477AN0NNNNN	400 HP normal-duty capability
400 HP large industrial motor	20F1AND477AN0NNNNN	477 A output capacity
Advanced high-power application	20G1AND477JN0NNNNN	Advanced-drive platform
Compact lower-power machine	25B-D024N114	Smaller drive class

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57. Key Strengths at a Glance

Strength	Description
477 A Output	Very high current capacity for large motors
400 HP ND	High normal-duty power capability
300 HP HD	Strong heavy-duty capacity
480 VAC	Suitable for high-power industrial systems
Frame 7	High-power mechanical platform
Forced Air	Appropriate cooling method for high-current operation
Embedded I/O	Simplifies basic control integration
EMC Filter	Supports industrial EMC requirements
AC Precharge	Suitable high-power input architecture
Open Type	Flexible cabinet integration
Variable Speed	Provides adjustable motor operation
PowerFlex 753	Broad industrial application range
High Current Rating	Suitable for very large industrial motors

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58. Important Configuration Consideration

The 20F1AND477AN0NNNNN should not be treated as identical to every other 477 A PowerFlex 753 model.

The most important configuration characteristics include:

• 400 HP normal duty
• 300 HP heavy duty
• 477 A output
• 480 VAC three-phase
• Frame 7
• AC input with precharge
• No DC terminals
• EMC filter
• CM jumper removed
• No internal dynamic-braking transistor
• Embedded I/O
• Blank/no HIM

These details matter when replacing an existing unit.

A drive with the same current and horsepower but a different configuration suffix may have different electrical characteristics or installed options.

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59. Overall Product Assessment

The Allen-Bradley 20F1AND477AN0NNNNN is a high-capacity PowerFlex 753 AC drive designed for large industrial motor applications.

Its principal specifications are:

• 380–480 VAC input class
• 480 VAC nominal voltage
• Three-phase operation
• 477 A output current
• 400 HP normal-duty rating
• 300 HP heavy-duty rating
• Approximately 298 kW normal-duty capacity
• Approximately 224 kW heavy-duty capacity
• Frame 7
• Forced-air cooling
• IP20/IP00 open-type construction
• AC input with precharge
• No DC terminals
• EMC filtering
• CM jumper removed
• Embedded I/O
• Blank/no HIM
• No internal dynamic-braking transistor

Its approximate dimensions are:

881.5 × 430 × 349.6 mm

Its approximate weight is:

124.7 kg

The drive is particularly well suited to large pumps, industrial fans, blowers, conveyors, compressors, mixers, agitators, material-handling systems and large process machinery.

Its 477 A current capacity gives it substantial headroom within the high-power PowerFlex 753 range.

The 400 HP normal-duty rating makes it especially attractive for large variable-torque systems where adjustable motor speed is required.

The 300 HP heavy-duty rating also makes it suitable for many demanding applications where higher torque and greater overload capability are required.

The Frame 7 construction and forced-air cooling system are appropriate for the thermal and mechanical requirements of a drive at this power level.

The open-type enclosure provides flexibility for cabinet integration, while the EMC filter configuration supports industrial electrical installations where electromagnetic compatibility is an important consideration.

The embedded I/O also makes it practical for integration into industrial control systems.

The most important point to consider during replacement or system modification is the exact A-series configuration.

The 20F1AND477AN0NNNNN has an EMC-filter configuration with the CM jumper removed and does not include an internal dynamic-braking transistor.

Therefore, when replacing this drive with another 477 A PowerFlex 753 model, the complete catalog configuration should be compared rather than selecting solely on horsepower and current.

From a selection standpoint, this model is best positioned for applications requiring approximately 400 HP normal-duty capacity or 300 HP heavy-duty capacity at the 480 VAC three-phase class.

For slightly smaller applications, the 361 A and 415 A models can reduce drive capacity and overall system size.

For applications requiring the same 477 A / 400 HP capacity but a different catalog configuration, the 477 J-series model can be considered after checking the electrical requirements.

For more advanced control requirements, a PowerFlex 755-class drive can provide an alternative platform.

Overall, the 20F1AND477AN0NNNNN can be characterized as a 477 A, 480 VAC, three-phase, 400 HP normal-duty, 300 HP heavy-duty, Frame 7 PowerFlex 753 industrial AC drive, intended for large-scale variable-speed motor control in industrial production, process, utility and material-handling environments.