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Allen-Bradley 20G1AND477AN0NNNNN PowerFlex 755 AC Drive

1. Product Overview

The Allen-Bradley 20G1AND477AN0NNNNN is a high-power industrial AC variable frequency drive belonging to the PowerFlex 755 AC Drive series. It is designed for large motors and demanding industrial machinery where high output current, adjustable speed, controlled acceleration and deceleration, network communication, and flexible motor control are required.

This model is rated for a 480 VAC, three-phase electrical system and provides approximately 477 A of normal-duty output current. Its nominal rating is approximately 400 HP for normal-duty applications and 300 HP for heavy-duty applications, placing it in the high-power range of the PowerFlex 755 family.

The drive uses a Frame 7 construction and forced-air cooling. The approximate physical dimensions are around 881.5 mm high × 430 mm wide × 349.6 mm deep, with an approximate product weight of 68 kg. Actual cabinet space and installed-system weight will be greater because additional clearance, wiring, protective equipment, and mounting hardware are normally required.

The model includes embedded EtherNet/IP communication, making it suitable for integration into industrial automation networks. It is configured for AC input with precharge and no DC terminals, with filtering and the CM jumper installed.

An important configuration detail is the AN0 portion of the catalog number. This configuration does not include an internal dynamic braking transistor. This distinguishes the model from closely related versions such as 20G1AND477AA0NNNNN and 20G1AND477JA0NNNNN, which use different braking and filtering configurations.

The model also has a blank/no HIM configuration, meaning a standard door-mounted Human Interface Module is not supplied as part of this catalog configuration.

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2. Brand and Product Series

Item	Specification
Brand	Allen-Bradley
Product Family	PowerFlex
Product Series	PowerFlex 755
Product Type	Industrial AC Variable Frequency Drive
Model	20G1AND477AN0NNNNN
Bulletin / Platform	PowerFlex 755 AC Drive
Voltage Class	480 VAC
Input Phase	Three Phase
Frame Size	Frame 7
Cooling	Forced Air
Communication	Embedded EtherNet/IP
Enclosure Type	Open Type
Protection Class	IP20/IP00 configuration
Installation	Industrial Cabinet / Panel
Dynamic Braking	No Internal Dynamic Braking Transistor

The PowerFlex 755 series is intended for applications requiring a combination of high motor power, flexible control, network communication, diagnostics, and modular expansion.

Compared with smaller variable frequency drives, the PowerFlex 755 platform is better suited to large industrial equipment where the drive is an important part of the machine or process-control system.

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3. Main Technical Parameters

Parameter	Specification
Model	20G1AND477AN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product Type	AC Variable Frequency Drive
Input Voltage	480 VAC
Input Phase	3 Phase
Output Current	477 A
Normal-Duty Rating	400 HP
Normal-Duty Power	Approx. 298 kW
Heavy-Duty Rating	300 HP
Heavy-Duty Power	Approx. 224 kW
Frame Size	Frame 7
Input Type	AC Input with Precharge
DC Terminals	No
Cooling Method	Forced Air
Enclosure	IP20/IP00, Open Type
Filtering	Yes
CM Jumper	Removed
Dynamic Braking Transistor	No
Dynamic Braking Resistor	Not integrated
Communication	Embedded EtherNet/IP
Human Interface Module	Blank / No HIM
PID Control	Supported
Integrated Motion	No
Height	Approx. 881.5 mm
Width	Approx. 430 mm
Depth	Approx. 349.6 mm
Dimensions	Approx. 881.5 × 430 × 349.6 mm
Weight	Approx. 68 kg
Operating Temperature	Approx. 0 to 50 °C, with applicable derating outside standard conditions
Storage Temperature	Approx. -40 to +70 °C

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4. Electrical Specifications

The 20G1AND477AN0NNNNN is intended for a 480 VAC three-phase power supply.

Its 477 A current rating places it firmly in the high-power industrial drive category. The drive is designed for large motors and machinery where a smaller drive would not provide sufficient current capacity.

The normal-duty rating is approximately 400 HP, equivalent to roughly 298 kW. The heavy-duty rating is approximately 300 HP, equivalent to roughly 224 kW.

These ratings should be considered in relation to the actual motor nameplate current and load characteristics. A motor’s horsepower alone is not enough to determine whether a drive is correctly sized.

Electrical Parameter	Specification
Model	20G1AND477AN0NNNNN
Voltage Class	480 VAC
Input Phase	Three Phase
Output Current	477 A
Normal-Duty Rating	400 HP
Normal-Duty Power	Approx. 298 kW
Heavy-Duty Rating	300 HP
Heavy-Duty Power	Approx. 224 kW
Input Frequency	50/60 Hz class
Input Configuration	AC Input with Precharge
DC Input Terminals	None
Filtering	Yes
CM Jumper	Removed
Dynamic Braking Transistor	None
Cooling	Forced Air
Communication	Embedded EtherNet/IP

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5. Normal-Duty and Heavy-Duty Ratings

The distinction between normal duty and heavy duty is particularly important for a drive of this size.

Under normal-duty operation, the model is rated for approximately 400 HP.

Under heavy-duty operation, the rating is approximately 300 HP.

Normal-duty applications often have comparatively moderate overload requirements, while heavy-duty applications can involve higher torque, more severe acceleration, or greater cyclic loading.

For example, a large fan may have a relatively predictable load profile, while a loaded conveyor, crusher-related system, mixer, or material-handling machine may experience much more demanding torque conditions.

The appropriate rating should therefore be selected according to the actual load profile rather than simply choosing the highest motor horsepower that appears in the catalog description.

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6. Dimensions and Weight

The 20G1AND477AN0NNNNN uses a Frame 7 mechanical configuration.

The approximate dimensions are:

Height: 881.5 mm

Width: 430 mm

Depth: 349.6 mm

The approximate product weight is 68 kg.

Because this is a large industrial drive, the physical dimensions should be considered carefully when designing or modifying an electrical cabinet.

The drive dimensions do not represent the total cabinet dimensions required for a complete installation. Additional space is normally required for power cables, control cables, airflow, grounding, protective devices, maintenance access, and other equipment.

Mechanical Parameter	Specification
Model	20G1AND477AN0NNNNN
Frame Size	Frame 7
Height	Approx. 881.5 mm
Width	Approx. 430 mm
Depth	Approx. 349.6 mm
Overall Dimensions	Approx. 881.5 × 430 × 349.6 mm
Weight	Approx. 68 kg
Cooling	Forced Air
Enclosure Type	Open Type
Protection	IP20/IP00
Installation	Panel / Cabinet Mounting

For installation and replacement work, the approximately 68 kg weight should be taken into account when designing the support structure and handling procedure.

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7. Product Introduction

The 20G1AND477AN0NNNNN is intended for large industrial motor-control systems where a high-capacity variable frequency drive is required.

It provides a combination of high current output, adjustable motor speed, controlled acceleration and deceleration, industrial communication, diagnostics, and flexible control functions.

A large motor is often not operated at a single fixed speed throughout an entire production process. The required speed can change according to material flow, production rate, pressure, temperature, airflow, conveyor speed, or other process conditions.

A variable frequency drive allows the motor to respond to these changing requirements.

In a larger automation system, the drive can receive commands from the plant control system, regulate motor operation, and return operating information to the controller.

This makes the PowerFlex 755 platform particularly useful in applications where the motor is closely integrated with the production process.

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8. Embedded EtherNet/IP Communication

The 20G1AND477AN0NNNNN includes an embedded EtherNet/IP communication interface.

This allows the drive to participate in an industrial automation network and exchange operating information with compatible control equipment.

Typical information that can be exchanged includes:

• Start commands.
• Stop commands.
• Speed references.
• Actual speed.
• Output current.
• Drive status.
• Warning information.
• Fault information.
• Operating mode.
• Process references.
• Diagnostic information.

Network integration is especially valuable in large plants where multiple drives are distributed across different sections of the production system.

Instead of requiring every drive to be operated locally, the main control system can coordinate drive operation from a centralized automation architecture.

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9. Dynamic Braking Configuration

One of the most important characteristics of 20G1AND477AN0NNNNN is its braking configuration.

This model does not include an internal dynamic braking transistor.

This should be clearly distinguished from related catalog configurations that include an internal braking transistor.

When a high-inertia motor decelerates, energy can be returned to the drive’s DC bus. Depending on the application, this energy may require a suitable regenerative or braking-energy management strategy.

Because this specific model does not include an internal dynamic braking transistor, the braking arrangement needs to be evaluated separately if the application requires rapid or repeated deceleration.

This is particularly important for:

• Large conveyors.
• High-inertia rotating machinery.
• Material-handling equipment.
• Hoisting-related applications.
• Machines with frequent stopping cycles.
• Systems requiring short deceleration times.

The absence of the internal braking transistor is not inherently a disadvantage. It simply means that the braking configuration must match the actual system requirements.

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10. Filtering and CM Jumper Configuration

The AN0 configuration includes filtering, while the catalog configuration identifies the CM jumper as removed.

This configuration detail can be relevant when designing the electrical system because common-mode capacitance and grounding arrangements can affect drive behavior and motor-cable electrical characteristics.

The CM jumper configuration should be considered together with the site’s grounding system, power-distribution arrangement, motor-cable length, and applicable installation requirements.

When replacing an existing drive, it is particularly important to compare the filtering and common-mode configuration rather than assuming that every 477 A PowerFlex 755 drive is electrically identical.

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11. Applications

11.1 Large Conveyor Systems

Large conveyor systems are a natural application for a 477 A industrial drive.

Conveyors used in large manufacturing plants, bulk-material handling, processing facilities, mining-related machinery, warehouses, and production systems can require motors with several hundred horsepower.

The drive can control conveyor speed and provide controlled acceleration and deceleration.

This can help reduce mechanical stress on:

• Gearboxes.
• Couplings.
• Conveyor belts.
• Shafts.
• Bearings.
• Mechanical drive components.

Network communication also allows conveyor operation to be coordinated with upstream and downstream machinery.

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11.2 Large Pumps

Large pumps can require substantial motor power, especially in industrial processing, water movement, cooling, and circulation systems.

The drive can adjust motor speed according to process requirements.

Typical applications include:

• Large process pumps.
• Cooling-water pumps.
• Circulation systems.
• Water-transfer systems.
• Industrial pumping stations.
• Process-fluid systems.
• Pressure-control systems.

PID control can be particularly useful where pump speed needs to respond automatically to pressure, flow, or another process variable.

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11.3 Large Fans

Large fans and ventilation systems can require considerable motor power.

A variable frequency drive allows the fan to operate at different speeds rather than remaining at a fixed maximum speed.

Potential applications include:

• Industrial ventilation.
• Process exhaust.
• Cooling systems.
• Air-handling equipment.
• Combustion-air systems.
• Large plant ventilation.

This type of application can benefit from the combination of variable speed and process feedback.

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11.4 Blowers

Large industrial blowers can also require motors in the hundreds-of-horsepower range.

The drive can regulate blower speed according to process requirements.

For example, airflow requirements may change as production conditions change.

The drive can therefore become part of an automated airflow-control system.

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11.5 Compressors

Large compressors can require substantial starting torque and high continuous current.

The 477 A capacity of the 20G1AND477AN0NNNNN makes it appropriate for large compressor motor-control systems when the motor and compressor characteristics are compatible with variable-frequency operation.

Typical applications include:

• Industrial air compressors.
• Process compressors.
• Large mechanical compressors.
• Industrial gas systems.
• Production-process compression equipment.

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11.6 Material Handling

Large material-handling systems often require high-power motors and controlled speed.

Potential applications include:

• Bulk-material conveyors.
• Transfer systems.
• Feeders.
• Processing lines.
• Large transport systems.
• Heavy production machinery.

The high current capacity and industrial networking capabilities make this model suitable for large coordinated material-handling systems.

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11.7 Mixers and Agitators

Large mixers and agitators can experience changing torque requirements as material characteristics change.

The variable frequency drive can provide adjustable speed so that the motor does not have to operate at one fixed speed.

This can be useful in:

• Chemical processing.
• Material processing.
• Food-related industrial equipment.
• Industrial mixing.
• Large batch-processing systems.

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11.8 Process Machinery

The drive can be used for large process machines where speed control is an important part of the production process.

Examples include:

• Mills.
• Large extruders.
• Mixers.
• Agitators.
• Processing machinery.
• Large rotating equipment.
• Production-line machinery.

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12. Main Advantages

12.1 Very High Current Capacity

The approximately 477 A output rating is the defining feature of this drive.

It provides sufficient capacity for very large motors and heavy industrial machinery.

This makes it suitable for applications where compact drives are not capable of supplying the required motor current.

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12.2 400 HP Normal-Duty Rating

The approximately 400 HP normal-duty rating provides substantial motor-control capacity.

It is suitable for large fans, pumps, conveyors, compressors, and process machinery when the load profile matches the normal-duty rating.

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12.3 300 HP Heavy-Duty Rating

The approximately 300 HP heavy-duty rating allows the drive to be used in applications with more demanding load conditions.

The actual motor current and overload requirements should be checked carefully before selecting the drive.

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12.4 Embedded EtherNet/IP

Embedded EtherNet/IP provides an important connection between the drive and the broader automation system.

For a large production plant, this can simplify centralized monitoring and control.

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12.5 High-Power Industrial Construction

Frame 7 construction is intended for large industrial motor applications.

The drive is physically and electrically designed for a much higher power range than compact machine drives.

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12.6 Flexible Control Architecture

The PowerFlex 755 platform supports a broad range of motor-control requirements.

This allows the drive to be used across different types of machinery without requiring an entirely different drive architecture for every application.

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12.7 Diagnostic Functions

Large drives can have a significant effect on plant production when a fault occurs.

Diagnostic and monitoring functions can help maintenance personnel determine the operating condition of the drive and investigate abnormal events.

This is particularly valuable for equipment that operates continuously or forms part of a critical production process.

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13. Control Functions

The PowerFlex 755 platform provides a broad range of control functionality.

Typical capabilities include:

• Adjustable speed control.
• Acceleration control.
• Deceleration control.
• PID process control.
• Current monitoring.
• Drive status monitoring.
• Fault monitoring.
• Network control.
• Programmable references.
• Motor protection.
• Diagnostic monitoring.

The drive can therefore be used as an important control component within a larger automated machine.

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14. PID Applications

PID control can be useful in applications where the motor needs to maintain a process variable.

For a pump, the controlled variable might be pressure or flow.

For a fan, the controlled variable could be airflow or duct pressure.

For a blower, the control variable may be system pressure.

Instead of manually changing motor speed, the control system can use process feedback to adjust the drive reference.

This makes the PowerFlex 755 suitable for automated process-control applications.

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15. Industrial Automation Integration

The 20G1AND477AN0NNNNN can be integrated into larger automation architectures.

A typical system may contain:

• Programmable controllers.
• Distributed I/O.
• Human-machine interfaces.
• Multiple variable frequency drives.
• Sensors.
• Motors.
• Process instruments.
• Safety equipment.

The drive can provide the motor-control portion of this system while communicating operating information to the higher-level control architecture.

This is especially useful when a plant contains many large motors that need to operate in a coordinated manner.

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16. Installation Considerations

The physical size of a Frame 7 drive should be considered carefully during cabinet design.

The approximate dimensions of 881.5 × 430 × 349.6 mm provide a starting point for estimating the mounting area.

However, the final cabinet should allow additional space for:

• Incoming power connections.
• Motor cables.
• Grounding.
• Control wiring.
• Communication cables.
• Airflow.
• Maintenance access.
• Protective equipment.
• Cable bending radius.
• Heat dissipation.

The approximately 68 kg weight should also be considered when designing the mounting structure.

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17. Cooling and Thermal Management

The drive uses forced-air cooling.

At this power level, thermal management is an important part of the installation.

The cabinet should allow adequate airflow and should prevent excessive recirculation of heated air.

Dust and debris should not be allowed to accumulate around cooling passages.

The operating temperature of the drive can also be affected by:

• Ambient temperature.
• Installation altitude.
• Motor loading.
• Switching frequency.
• Cabinet ventilation.
• Airflow restrictions.
• Continuous operating current.

Correct thermal design is therefore essential for long-term reliability.

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18. Environmental Characteristics

Environmental Parameter	Specification
Model	20G1AND477AN0NNNNN
Cooling	Forced Air
Operating Temperature	Approx. 0 to 50 °C standard range
Storage Temperature	Approx. -40 to +70 °C
Protection	IP20/IP00 configuration
Enclosure	NEMA/UL Open Type
Installation Environment	Industrial
Frame	7
Weight	Approx. 68 kg

Actual allowable operating conditions can depend on load, altitude, switching frequency, enclosure design, airflow, and required derating.

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19. Five Related PowerFlex 755 Models

The following models are useful related choices within the same 480 VAC PowerFlex 755 family.

Model	Voltage	Output Current	Normal-Duty Rating	Heavy-Duty Rating	Frame	Approx. Dimensions H × W × D	Approx. Weight
20G1AND302JN0NNNNN	480 VAC	302 A	250 HP	200 HP	7	Approx. 842 × 410 × 346.4 mm	Approx. 79 kg
20G1AND350JN0NNNNN	480 VAC	Approx. 350 A class	Approx. 300 HP class	Approx. 250 HP class	7	Approx. 842 × 410 × 346.4 mm	Approx. 79 kg
20G1AND415JN0NNNNN	480 VAC	415 A	350 HP	300 HP	7	Approx. 842 × 410 × 346.4 mm	Approx. 79 kg
20G1AND477JN0NNNNN	480 VAC	477 A	400 HP	300 HP	7	Approx. 842 × 410 × 346.4 mm	Approx. 79 kg
20G1AND477JA0NNNNN	480 VAC	477 A	400 HP	300 HP	7	Approx. 842 × 410 × 346.4 mm	Approx. 79 kg

The models above are useful for comparing different current capacities and braking configurations.

The 20G1AND477JN0NNNNN is especially close to the requested model electrically, but it uses the JN0 configuration rather than AN0.

The 20G1AND477JA0NNNNN is another particularly relevant comparison because it has the same basic 477 A and 400 HP / 300 HP ratings but uses a different filtering and dynamic-braking configuration.

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20. Related Model Comparison

Model	Current	Normal Duty	Heavy Duty	Dynamic Braking	CM Jumper Configuration	Approx. Weight
20G1AND302JN0NNNNN	302 A	250 HP	200 HP	None	Installed	Approx. 79 kg
20G1AND350JN0NNNNN	Approx. 350 A	Approx. 300 HP	Approx. 250 HP	None	Installed	Approx. 79 kg
20G1AND415JN0NNNNN	415 A	350 HP	300 HP	None	Installed	Approx. 79 kg
20G1AND477JN0NNNNN	477 A	400 HP	300 HP	None	Installed	Approx. 79 kg
20G1AND477JA0NNNNN	477 A	400 HP	300 HP	Internal transistor	Different configuration	Approx. 79 kg
20G1AND477AN0NNNNN	477 A	400 HP	300 HP	None	Removed	Approx. 68 kg

The exact dimensions and shipping or packaged weight can vary depending on the specific documentation and configuration being referenced. For engineering replacement work, the actual drive dimensional drawing should be matched to the installation.

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21. Five Popular Models Under the Same Brand

The following models provide a broader comparison across different PowerFlex product classes.

Model	Product Series	Voltage Class	Current / Rating	Typical Power Class	Approx. Dimensions H × W × D	Approx. Weight
25B-D017N104	PowerFlex 525	380–480 VAC	17 A	Approx. 7.5 kW / 10 HP	Approx. 130 × 260 × 212 mm	Approx. 3 kg
25B-D024N114	PowerFlex 525	380–480 VAC	24 A	Approx. 11 kW / 15 HP	Approx. 130 × 260 × 212 mm	Approx. 3.2 kg
20F11ND034JA0NNNNN	PowerFlex 753	480 VAC class	34 A	Approx. 25 HP class	Approx. 350 × 170 × 200 mm	Approx. 10 kg
20G1AND302JN0NNNNN	PowerFlex 755	480 VAC	302 A	250 HP ND / 200 HP HD	Approx. 842 × 410 × 346.4 mm	Approx. 79 kg
20G1AND477AN0NNNNN	PowerFlex 755	480 VAC	477 A	400 HP ND / 300 HP HD	Approx. 881.5 × 430 × 349.6 mm	Approx. 68 kg

The first two models are compact drives for considerably smaller motors.

The PowerFlex 753 model is designed for industrial applications requiring more capacity and functionality than compact machine drives.

The PowerFlex 755 models are intended for much larger motors and more demanding industrial equipment.

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22. Application Comparison

Application	Recommended Characteristics	Reason This Model Can Be Used
Large Conveyor	High current + variable speed	477 A capacity and flexible speed control
Bulk Material Handling	High current + industrial communication	Suitable for large coordinated systems
Large Pump	Variable speed + PID	Suitable for pressure and flow control
Large Fan	Variable speed + network control	Suitable for large ventilation systems
Large Blower	High current	Suitable for high-power blower motors
Compressor	High current + controlled acceleration	Suitable for compatible large compressors
Mixer	Adjustable speed	Useful for changing process loads
Agitator	Variable-speed control	Useful for process machinery
Process Machine	Network + diagnostics	Suitable for automated process systems
Production Line	Centralized control	Embedded network communication
High-Inertia Machine	Requires braking analysis	External braking strategy may be required

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23. Why the 20G1AND477AN0NNNNN Is Suitable for Large Industrial Systems

The most significant characteristic of this drive is its combination of 477 A output capacity and 400 HP normal-duty rating.

This places it in a category intended for large industrial motors.

For a large production plant, the motor may be responsible for moving material, circulating process fluids, driving a large fan, operating a compressor, or powering a major rotating machine.

In such systems, the drive has to do much more than vary motor frequency.

It must coordinate motor operation with the rest of the automation system.

It must also provide appropriate protection, monitoring, fault information, and controlled acceleration and deceleration.

The PowerFlex 755 architecture is designed for this type of industrial environment.

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24. Maintenance Considerations

The forced-air cooling system should be included in the maintenance plan.

Airflow passages should be kept clean and free from excessive dust.

Cooling fans should be inspected according to the applicable maintenance schedule.

Power connections should be checked periodically for signs of abnormal heating or mechanical looseness.

Communication wiring should also be checked when network-related faults occur.

Drive fault history and diagnostic information can be useful when investigating intermittent production problems.

Because the drive is a high-power device, maintenance should be carried out using appropriate electrical safety procedures.

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25. Important Catalog Number Considerations

The complete model number 20G1AND477AN0NNNNN contains configuration information that is important when identifying the product.

The important characteristics include:

• PowerFlex 755 platform.
• AC input with precharge.
• No DC terminals.
• 480 VAC class.
• 477 A normal-duty current rating.
• 400 HP normal-duty rating.
• 300 HP heavy-duty rating.
• Frame 7.
• Filtered configuration.
• CM jumper removed.
• No internal dynamic braking transistor.
• Blank/no HIM configuration.
• Embedded EtherNet/IP.

This is why replacing the drive only by matching the voltage and horsepower can lead to an incorrect selection.

The complete catalog number should be compared when determining whether a drive is an appropriate replacement.

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26. Comparison with 20G1AND477JN0NNNNN

The 20G1AND477JN0NNNNN is a particularly important related model.

Both models are 477 A, 480 VAC, three-phase PowerFlex 755 drives with 400 HP normal-duty and 300 HP heavy-duty ratings.

However, their configuration codes are different.

Parameter	20G1AND477AN0NNNNN	20G1AND477JN0NNNNN
Voltage	480 VAC	480 VAC
Output Current	477 A	477 A
Normal Duty	400 HP	400 HP
Heavy Duty	300 HP	300 HP
Frame	7	7
Input	AC with Precharge, No DC Terminals	AC with Precharge, No DC Terminals
Filtering	Yes	Yes
CM Jumper	Removed	Installed
Dynamic Braking	No Internal Transistor	No Internal Transistor
Communication	Embedded EtherNet/IP	Embedded EtherNet/IP
HIM	Blank / No HIM	Blank / No HIM
Cooling	Forced Air	Forced Air

The most obvious difference in the listed configuration is the CM jumper arrangement.

Therefore, although the two models have the same basic current and power ratings, the complete configuration should be checked before substituting one for the other.

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27. Product Advantages at a Glance

Feature	Advantage
477 A Output	Supports very large industrial motors
400 HP Normal Duty	Suitable for high-power applications
300 HP Heavy Duty	Suitable for demanding load conditions
480 VAC	Suitable for common industrial motor systems
Frame 7	Designed for high-capacity applications
EtherNet/IP	Simplifies integration with automation systems
Forced-Air Cooling	Provides active thermal management
Filtering	Helps address electrical-noise considerations
AC Input with Precharge	Suitable for the specified PowerFlex architecture
No DC Terminals	Defined AC-input configuration
No Internal Braking Transistor	Appropriate for systems using a separate braking strategy
PID Control	Useful for pumps, fans and process systems
Diagnostics	Supports commissioning and maintenance
Open-Type Construction	Suitable for cabinet installations
No HIM	Suitable for remote/networked control architectures

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28. Technical Summary

The Allen-Bradley 20G1AND477AN0NNNNN is a high-power PowerFlex 755 AC variable frequency drive designed for large industrial motor applications.

Its principal electrical rating is 477 A at 480 VAC, three phase, with approximately 400 HP normal-duty and 300 HP heavy-duty capacity.

The drive uses a Frame 7 construction and forced-air cooling.

The approximate dimensions are:

881.5 mm × 430 mm × 349.6 mm

The approximate weight is:

68 kg

The drive uses an IP20/IP00 open-type configuration, with AC input and precharge and no DC terminals.

The unit is filtered and uses the catalog configuration with the CM jumper removed.

It has an embedded EtherNet/IP communication interface and does not include a standard HIM in this configuration.

Another important feature is the absence of an internal dynamic braking transistor.

This makes the model different from certain closely related PowerFlex 755 configurations that include internal dynamic braking hardware.

The drive is particularly appropriate for large conveyors, pumps, fans, blowers, compressors, material-handling systems, mixers, agitators, and large process machines.

Its high current capacity makes it suitable for motors in the several-hundred-horsepower range, provided the actual motor current and load duty fall within the drive’s ratings.

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29. Final Product Description

The Allen-Bradley 20G1AND477AN0NNNNN is a high-capacity industrial AC drive belonging to the PowerFlex 755 series.

It is designed for demanding applications where large motors must operate at adjustable speeds and where the drive needs to communicate with a larger industrial control system.

With approximately 477 A output current, 400 HP normal-duty capacity, and 300 HP heavy-duty capacity, it is suitable for large industrial machinery.

Its 480 VAC three-phase electrical configuration makes it appropriate for high-power industrial motor systems.

The Frame 7 construction, forced-air cooling, embedded EtherNet/IP communication, filtering, and flexible control architecture make the drive suitable for sophisticated industrial installations.

The approximate physical dimensions of 881.5 × 430 × 349.6 mm and approximate weight of 68 kg should be considered during cabinet design, transportation, installation, and maintenance planning.

The absence of an internal dynamic braking transistor is a key configuration characteristic. For machines with high inertia or frequent rapid deceleration, the braking strategy should therefore be evaluated separately.

The model’s embedded EtherNet/IP communication makes it suitable for networked automation systems where centralized monitoring, drive control, fault reporting, and process coordination are required.

The drive can be applied to large conveyor systems, pumps, fans, blowers, compressors, material-handling equipment, mixers, agitators, and other process machinery.

For replacement work, the complete catalog number 20G1AND477AN0NNNNN should be checked carefully. Voltage, current, duty rating, frame size, filtering, CM jumper configuration, braking configuration, communication capability, and mechanical dimensions can all affect whether another catalog number is a suitable substitute.

Overall, the 20G1AND477AN0NNNNN is a high-power industrial variable frequency drive intended for large motors and demanding machinery where substantial current capacity, adjustable-speed operation, automation integration, and flexible industrial control are required.