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Allen-Bradley 20G14ND477AN0NNNNN — PowerFlex 755 AC Drive

1. Product Overview

The 20G14ND477AN0NNNNN is a high-power PowerFlex 755 AC Drive designed for demanding industrial motor-control applications.

It is a 480 VAC, three-phase, 477 A, Frame 7 variable-frequency drive. The model is configured for DC input with precharge, forced-air cooling, open-type installation, an EMC filter, and an installed embedded EtherNet/IP interface. The catalog configuration also specifies that the CM jumper is removed and that no HIM is included in the basic configuration.

The model has a 400 HP normal-duty rating and a 300 HP heavy-duty rating, corresponding to approximately 298 kW normal duty and 224 kW heavy duty. It is therefore intended for large industrial motors rather than compact machinery.

The product belongs to the PowerFlex 755 series and the broader PowerFlex 750-Series family. This family is designed for applications where precise speed control, motor control flexibility, network integration, diagnostics, and high-power operation are important.

An important point for purchasing and replacement planning is that this exact AN catalog configuration has reached discontinued status, with the JN version identified as the direct replacement configuration. Therefore, when replacing an existing unit, the complete catalog number, CM-jumper configuration, input arrangement, options, and application requirements should be checked rather than replacing the drive solely according to current rating.

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2. Brand and Product Series

Item	Description
Brand	Allen-Bradley
Product Series	PowerFlex 755
Product Family	PowerFlex 750-Series
Product Type	High-power AC Variable Frequency Drive
Model	20G14ND477AN0NNNNN
Voltage Class	480 VAC
Phase	3 Phase
Rated Current	477 A
Normal-Duty Rating	400 HP / approximately 298 kW
Heavy-Duty Rating	300 HP / approximately 224 kW
Frame Size	Frame 7
Cooling	Forced Air / Air Cooled
Enclosure	Open Type
Input	DC Input with Precharge
Filtering	EMC Filter
CM Jumper	Removed
Communication	Embedded EtherNet/IP
HIM	Blank / No HIM
Dynamic Braking	None
Main Application	Large industrial motor control

The PowerFlex 755 series is positioned for applications where the drive is an important part of the overall machine-control system.

Compared with smaller general-purpose drives, this platform is intended to provide a much broader range of control and integration possibilities for large motors, process machinery, material-handling equipment, pumps, fans, and other industrial systems.

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3. Detailed Technical Parameters

Parameter	Specification
Model	20G14ND477AN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product Type	AC Variable Frequency Drive
Voltage	480 VAC
Voltage Class	380–480 VAC class
Phase	3 Phase
Rated Output Current	477 A
Normal-Duty Power	400 HP / approximately 298 kW
Heavy-Duty Power	300 HP / approximately 224 kW
Frame	Frame 7
Input Configuration	DC Input with Precharge
Cooling	Forced Air
Enclosure	Open Type
Protection Style	IP00/IP20 open-type configuration, application dependent
Filter	EMC Filter
CM Jumper	Removed
Communication	Embedded EtherNet/IP
Human Interface Module	None / Blank
Dynamic Braking	None
Mounting	Cabinet / panel integration
Approx. Height	881.5 mm
Approx. Width	430 mm
Approx. Depth	349.6 mm
Approx. Dimensions	881.5 × 430 × 349.6 mm
Approx. Weight	79.4 kg
Motor Application	Large industrial motors
Control Application	Variable-speed motor control
Typical Duty	Industrial continuous or cyclic operation, depending on load

The 477 A current rating is the key electrical characteristic of this particular model. The normal-duty rating is approximately 400 HP, while the heavy-duty rating is approximately 300 HP.

The physical size is considerably larger than compact drives because the drive contains high-power switching components, cooling hardware, power connections, control electronics, and associated protection components.

A representative Frame 7 envelope is approximately 881.5 mm high, 430 mm wide, and 349.6 mm deep, with an approximate drive weight of 79.4 kg. The actual installed dimensions and weight should be confirmed against the mechanical drawing for the exact configuration before cabinet fabrication or lifting arrangements.

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4. Dimensions and Weight

Because this is a large Frame 7 industrial drive, mechanical planning should be treated as an important part of the installation.

Mechanical Parameter	Approximate Value
Frame	7
Height	881.5 mm
Width	430 mm
Depth	349.6 mm
Overall Envelope	881.5 × 430 × 349.6 mm
Approximate Weight	79.4 kg
Construction	Open Type
Cooling	Forced Air
Installation	Electrical cabinet / control enclosure

The approximate 79.4 kg weight represents the drive itself and should not automatically be considered the final shipping or cabinet assembly weight. Additional hardware, disconnects, fuses, reactors, contactors, bus components, cables, filters, control equipment, and enclosure structures can substantially increase the total system weight.

For a replacement project, the physical envelope should be checked before removing the old drive.

For a new control cabinet, additional clearance should be allowed for airflow, cable bending radius, power connections, inspection, maintenance, and heat dissipation.

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5. Model Number Explanation

The complete catalog number is:

20G14ND477AN0NNNNN

The catalog number contains several configuration elements that identify the drive family and selected hardware arrangement.

Catalog Section	General Description
20G	PowerFlex 755 drive family
14	480 VAC class / Frame 7 configuration
ND	DC input / related drive configuration
477	477 A current class
A	CM jumper removed
N0NNNNN	Additional configuration positions

The 477 section is particularly important because it identifies the current class.

The A configuration is also important because the catalog description specifies CM jumper removed. This should be checked carefully when comparing this model with another catalog number that has the same voltage and current rating but a different CM-jumper configuration.

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6. Product Introduction

The 20G14ND477AN0NNNNN is designed to regulate the speed and operation of large AC motors.

Instead of allowing a motor to operate only at a fixed speed, the drive changes the electrical output supplied to the motor so that the motor can operate at different speeds according to the process requirement.

This is especially useful in industrial machinery where the motor does not need to run at full speed continuously.

A large pump, for example, may require different flow rates at different times. A large fan may need different airflow depending on production conditions. A conveyor may require controlled acceleration, production-speed regulation, and controlled stopping.

In these situations, the drive becomes part of the process-control system rather than simply functioning as a motor starter.

The high current capacity of this model makes it appropriate for large motors and substantial mechanical loads.

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7. Electrical Performance

The drive is designed for a 480 VAC, three-phase electrical system and provides a nominal 477 A output-current class.

Its principal horsepower ratings are:

Duty	Rating
Normal Duty	400 HP
Normal Duty, Approx. Metric Equivalent	298 kW
Heavy Duty	300 HP
Heavy Duty, Approx. Metric Equivalent	224 kW
Rated Current	477 A

The normal-duty rating is appropriate for applications where the motor load does not continuously impose the higher thermal and overload requirements associated with heavy-duty service.

Heavy-duty applications generally require more conservative sizing because the drive can experience higher torque and overload demand.

For this reason, a 477 A drive should not automatically be considered suitable for every 400 HP motor.

Motor nameplate current, load characteristics, overload requirements, acceleration time, ambient temperature, installation conditions, and operating cycle should all be considered during final selection.

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8. DC Input with Precharge

One notable characteristic of this model is its DC input with precharge configuration.

This makes the drive different from a conventional AC-input configuration.

A DC-bus arrangement can be useful in industrial systems where multiple drives share a common DC bus or where the electrical architecture has been designed around a DC distribution system.

The precharge function is important because the DC link contains substantial capacitive energy storage. Controlled precharging helps limit the initial current associated with charging the DC bus.

This type of configuration is particularly relevant to larger industrial systems where drive architecture, regenerative power, common-bus arrangements, or centralized electrical distribution are part of the machine design.

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9. Cooling and Thermal Management

The drive uses forced-air cooling.

At nearly 477 A, the drive can generate considerable heat during operation.

Proper airflow is therefore essential.

When the drive is installed inside a cabinet, the cabinet designer needs to consider:

• Drive heat loss
• Ambient temperature
• Internal cabinet temperature
• Airflow direction
• Fan capacity
• Ventilation openings
• Filter cleanliness
• Installation altitude
• Cable routing
• Clearance around ventilation areas

A drive can be electrically correctly sized and still experience reliability problems if the enclosure does not provide adequate thermal management.

For this reason, cabinet ventilation should be treated as part of the drive installation rather than as a secondary consideration.

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10. EtherNet/IP Communication

The model includes an embedded EtherNet/IP interface.

This provides an important advantage for modern industrial automation systems because the drive can communicate directly with the control network.

Typical drive information that can be exchanged with a controller includes:

• Start and stop commands
• Speed reference
• Actual speed
• Drive status
• Fault information
• Warning information
• Current information
• Torque-related information
• Operating parameters
• Diagnostic information

The network connection also allows the drive to become part of a larger machine-control architecture.

For facilities with many motors, centralized communication can make it easier to monitor operating conditions and identify faults.

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11. Product Applications

11.1 Large Pumps

Large industrial pumps are one of the most suitable applications for a drive of this size.

Applications can include:

• Process-water pumps
• Cooling-water pumps
• Water-treatment pumps
• Circulation pumps
• Transfer pumps
• Industrial utility pumps
• Large chemical-process pumps

The drive can regulate pump speed according to process demand.

For centrifugal pumps, reducing speed can potentially provide significant energy savings because pump power demand changes strongly with speed.

Actual energy savings depend on the complete hydraulic system and operating profile.

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12. Large Fans and Blowers

Large fans and blowers can also benefit from variable-speed operation.

Typical applications include:

• Industrial ventilation
• Exhaust systems
• Combustion-air systems
• Dust collection
• Process-air systems
• Cooling systems
• Large ventilation equipment

A variable-speed drive can change fan speed instead of relying entirely on mechanical dampers to control airflow.

This can improve process control and may reduce energy consumption when the process frequently operates below maximum airflow.

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13. Conveyor Systems

The 20G14ND477AN0NNNNN is also suitable for large conveyor applications.

Large conveyors can contain substantial amounts of mechanical inertia and material weight.

A controlled acceleration profile can reduce sudden mechanical loading on:

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

Controlled speed operation can also help synchronize material flow between different sections of a production system.

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14. Crushers and Heavy Machinery

High-power drives are frequently considered for crushers and other heavy machinery.

These machines can impose substantial torque requirements on the motor.

The drive’s high current capacity and heavy-duty operating capability make this type of platform appropriate for applications where a small general-purpose drive would not provide sufficient capacity.

Typical applications include:

• Crushers
• Grinding machinery
• Aggregate processing
• Bulk-material machinery
• Large feeders
• Heavy process equipment

The actual selection should be based on the machine’s torque profile rather than horsepower alone.

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15. Mining Applications

Mining equipment often requires large motors and robust control systems.

Potential applications include:

• Mining conveyors
• Crushers
• Large pumps
• Ventilation fans
• Material handling
• Processing machinery
• Auxiliary equipment

The ability to integrate the drive into a plant communication network is especially useful in large mining facilities.

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16. Cement and Aggregate Applications

Cement and aggregate plants commonly use large motors for:

• Fans
• Crushers
• Conveyors
• Mills
• Pumps
• Feeders
• Material-handling systems

Variable-speed control can allow these machines to operate according to production demand rather than continuously operating at maximum speed.

This can improve process flexibility and, in appropriate variable-torque applications, provide an opportunity for energy reduction.

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17. Metal and Process Industries

The drive can also be used in large process systems involving:

• Material transport
• Cooling systems
• Process pumps
• Ventilation
• Fans
• Large mechanical equipment
• Production-line machinery

A networked drive architecture can be particularly useful when speed references and operating conditions need to be coordinated with other equipment.

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18. Main Product Advantages

High Current Capacity

The most obvious advantage is the 477 A current rating.

This places the model firmly in the large industrial-drive category.

It can control motors that would be far beyond the practical range of compact variable-frequency drives.

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480 VAC Industrial Operation

The 480 VAC three-phase configuration is suitable for many large industrial electrical systems.

This makes the drive appropriate for factories and process plants where large motors are commonly operated from medium-to-high industrial voltage systems.

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Variable-Speed Control

Variable-speed operation is one of the main reasons to select a drive instead of a conventional fixed-speed motor starter.

The motor can be operated at different speeds according to the process.

This can improve:

• Production control
• Flow control
• Airflow control
• Conveyor speed
• Mechanical coordination
• Startup performance
• Stopping performance

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Controlled Acceleration

Large motors can create significant mechanical stress during starting.

The drive allows the acceleration profile to be controlled.

This can reduce sudden torque application to the machine.

For conveyors and other high-inertia systems, this can be especially useful.

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Controlled Deceleration

The drive can also provide controlled deceleration.

Instead of simply disconnecting the motor and allowing it to coast, the machine can be brought down according to a programmed speed profile.

The actual stopping capability and braking requirements depend on the load and system design.

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Network Integration

Embedded EtherNet/IP provides a convenient way to integrate the drive with a larger automation system.

This can reduce the amount of conventional point-to-point control wiring required for many applications.

It can also make drive status and diagnostic information more accessible to the operator.

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Flexible Motor Control

The PowerFlex 755 architecture supports several motor-control approaches, including traditional V/Hz control and more advanced vector-based control methods.

This gives engineers greater flexibility when dealing with different motor and load characteristics.

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Industrial Diagnostics

Large industrial systems benefit from diagnostic information because troubleshooting a high-power motor can be time-consuming.

Drive status, warnings, faults, and operating data can help maintenance personnel identify problems more quickly.

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19. Why Frame 7 Matters

The Frame 7 designation identifies the physical and power-class architecture of the drive.

A Frame 7 drive is substantially larger than small drives used for machine tools, small conveyors, or small pumps.

This larger frame provides the physical space required for high-power electrical components and cooling equipment.

When replacing an existing drive, the Frame 7 configuration is important because the replacement must be mechanically compatible as well as electrically suitable.

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20. Five Same-Series or Closely Related Models

The following models are useful comparison points within the same PowerFlex 755 family and closely related Frame 7 configurations.

Model	Voltage Class	Current	Normal-Duty Power	Heavy-Duty Power	Frame	Approx. Dimensions	Approx. Weight
20G14ND302AN0NNNNN	480 VAC, 3 Ph	302 A	Approx. 250 HP / 186 kW	Approx. 200 HP / 149 kW	7	Approx. 881.5 × 430 × 349.6 mm	Approx. 79 kg
20G14ND361AN0NNNNN	480 VAC, 3 Ph	361 A	Approx. 300 HP / 224 kW	Approx. 250 HP / 186 kW	7	Approx. 881.5 × 430 × 349.6 mm	Approx. 79 kg
20G14ND415AN0NNNNN	480 VAC, 3 Ph	415 A	Approx. 350 HP / 261 kW	Approx. 300 HP / 224 kW	7	Approx. 881.5 × 430 × 349.6 mm	Approx. 79 kg
20G14ND456AN0NNNNN	480 VAC, 3 Ph	456 A	Approx. 400 HP class	Approx. 300 HP class	7	Approx. 881.5 × 430 × 349.6 mm	Approx. 79 kg
20G14ND477AN0NNNNN	480 VAC, 3 Ph	477 A	400 HP / approx. 298 kW	300 HP / approx. 224 kW	7	Approx. 881.5 × 430 × 349.6 mm	Approx. 79.4 kg

These models are useful when selecting a drive according to the actual motor current.

The 302 A model is appropriate for a lower-power application where a 477 A drive would be unnecessarily large.

The 361 A and 415 A versions provide intermediate capacity.

The 456 A version is particularly close to the 477 A model and may be considered when the motor’s actual operating current is below the 477 A requirement.

The 477 A model provides the highest current rating in this comparison group.

The Frame 7 models share a broadly similar mechanical envelope, although exact dimensions and weights can vary according to configuration and options.

The catalog numbers listed above are also documented among the Frame 7 DC common-bus configurations of this product family.

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21. Five Additional Popular Allen-Bradley Models

The following models are useful when comparing the requested drive with other commonly selected drive families.

Model	Series	Voltage	Current / Power	Typical Position	Approx. Dimensions	Approx. Weight
20G11TF500JN0NNNNN	PowerFlex 755	690 VAC, 3 Ph	500 A ND / 500 kW ND	Very high-power industrial drive	Approx. 2145 × 778 × 425 mm	Approx. 286 kg
20G11TF460JN0NNNNN	PowerFlex 755	690 VAC, 3 Ph	460 A ND / 450 kW ND	High-power process applications	Approx. Frame 8 envelope	Approx. 286 kg
20F1ANC140JA0NNNNN	PowerFlex 753	480 VAC class	Approx. 140 A	Large general industrial applications	Approx. 880 × 430 × 350 mm	Approx. 73–109 kg
25B-D017N114	PowerFlex 525	480 VAC class	Approx. 17 A	Compact industrial machinery	Approx. 220 × 130 × 180 mm	Approx. 4–5 kg
25B-D024N114	PowerFlex 525	480 VAC class	Approx. 24 A	Small and medium machinery	Approx. 220 × 130 × 180 mm	Approx. 4–5 kg

These five models cover a much wider range of applications.

The 20G11TF500JN0NNNNN is a substantially larger 690 VAC PowerFlex 755 model and is intended for very high-power industrial motor applications.

The 20G11TF460JN0NNNNN is another high-power 690 VAC PowerFlex 755 configuration.

The 20F1ANC140JA0NNNNN belongs to the PowerFlex 753 family and is a useful alternative for applications that do not require the full capacity or configuration of the PowerFlex 755 platform.

The 25B-D017N114 and 25B-D024N114 are much smaller PowerFlex 525 drives. They are useful for small and medium machines but are not direct electrical replacements for the 477 A Frame 7 drive.

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22. Model Comparison by Application

Model	Relative Capacity	Recommended Application
20G14ND302AN0NNNNN	Medium-high	Pumps, fans, conveyors
20G14ND361AN0NNNNN	High	Large pumps and process machinery
20G14ND415AN0NNNNN	Very high	Large fans, pumps, conveyors
20G14ND456AN0NNNNN	Very high	Large industrial motors
20G14ND477AN0NNNNN	Highest in this group	Large 480 V industrial motors
20G11TF460JN0NNNNN	Extremely high	690 V large process equipment
20G11TF500JN0NNNNN	Extremely high	Very large industrial motors
20F1ANC140JA0NNNNN	Medium-high	General industrial applications
25B-D017N114	Low-medium	Compact machinery
25B-D024N114	Low-medium	Small and medium machines

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23. Advantages for Pump Applications

For a pump system, the most important advantage is the ability to match motor speed to process requirements.

A fixed-speed pump may produce more flow than the process actually requires.

With a variable-frequency drive, the pump speed can be reduced.

This can provide better control and, depending on the pump curve and system resistance, can reduce electrical consumption.

The drive can also provide controlled acceleration, which can help reduce sudden pressure changes and mechanical stress.

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24. Advantages for Fan Applications

Fans and blowers are another strong application area.

Airflow requirements can change considerably during production.

Instead of keeping the motor at full speed continuously, the drive can adjust speed to the required airflow.

This can provide:

• Better airflow regulation
• Smoother operation
• Improved process control
• Potential energy savings
• Reduced mechanical stress

The actual energy benefit depends on the fan system and operating conditions.

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25. Advantages for Conveyor Applications

Large conveyor systems often require controlled starting.

A sudden full-speed start can create mechanical shock and belt tension.

The drive allows acceleration to be programmed over a defined period.

This can help reduce stress on:

• Belts
• Gearboxes
• Couplings
• Bearings
• Drive shafts

It can also allow the conveyor to run at different speeds during different stages of production.

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26. Advantages for Heavy-Duty Machinery

For crushers, mills, feeders, and other heavy machinery, torque capability is often more important than simple horsepower.

The 477 A drive provides a large electrical capacity, while its heavy-duty rating allows it to be used in applications where the motor experiences greater load demands.

However, the heavy-duty rating is lower than the normal-duty horsepower rating, so engineers should select the drive based on the actual duty classification rather than simply using the 400 HP figure.

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27. Maintenance Considerations

Large air-cooled drives require regular attention to cooling and electrical connections.

Maintenance planning should consider:

• Cooling-fan condition
• Ventilation paths
• Dust accumulation
• Electrical terminals
• Grounding connections
• DC-bus condition
• Control wiring
• Network connections
• Fault history
• Cabinet temperature
• Motor cable condition

Dust and restricted airflow can increase operating temperature.

For equipment installed in harsh industrial environments, maintenance intervals should reflect the actual operating environment rather than relying solely on a generic schedule.

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28. Replacement Considerations

The exact 20G14ND477AN0NNNNN catalog configuration is an important model to identify correctly because several PowerFlex 755 drives can have similar current and horsepower ratings while differing in input configuration, filter configuration, CM jumper arrangement, feedback options, or other features.

The requested model is identified as:

480 VAC / 3 Phase / 477 A / 400 HP ND / 300 HP HD / Frame 7 / DC Input with Precharge / EMC Filter / CM Jumper Removed / No HIM.

The exact AN configuration has been discontinued, and the JN configuration is identified as its direct replacement. Therefore, if this model is being used for maintenance or replacement, the replacement should be evaluated against the original machine’s electrical and configuration requirements.

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29. Important Engineering Points

Before selecting this drive for a new project, the following points should be checked:

Engineering Item	Why It Matters
Motor rated voltage	Must match the drive system
Motor rated current	Primary sizing parameter
Motor horsepower	Confirms approximate power range
Load torque	Determines duty requirement
Overload requirement	Important for heavy-duty applications
Acceleration time	Influences current and mechanical loading
Deceleration time	May influence braking requirements
DC-bus architecture	Important because this model uses DC input
Ambient temperature	Affects thermal performance
Altitude	May affect drive capacity
Cabinet ventilation	Essential for air-cooled equipment
Motor cable	Must be suitable for variable-frequency operation
EMC installation	Important for electrical noise control
Communication system	Must match the automation network
Physical dimensions	Required for cabinet planning
Weight	Important for mounting and transportation
Safety architecture	Must be considered at machine-system level

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30. Overall Product Assessment

The Allen-Bradley 20G14ND477AN0NNNNN is a high-capacity PowerFlex 755 Frame 7 AC drive designed for large industrial motor applications.

Its key characteristics are 480 VAC three-phase operation, 477 A current capacity, 400 HP normal-duty rating, 300 HP heavy-duty rating, DC input with precharge, forced-air cooling, open-type construction, EMC filtering, embedded EtherNet/IP, and no integral HIM in the listed configuration.

The drive is particularly appropriate for large pumps, fans, blowers, conveyors, crushers, mills, mining machinery, cement equipment, material-handling systems, and other industrial processes requiring controlled motor speed.

Its main strengths are high power capacity, flexible speed control, controlled acceleration and deceleration, industrial network integration, and suitability for large process equipment.

The approximate mechanical envelope of 881.5 × 430 × 349.6 mm and approximate weight of 79.4 kg should be considered during cabinet design, transportation, mounting, and maintenance planning.

The most important point when selecting this model is that the drive should be matched to the actual motor current, voltage, load torque, duty cycle, overload requirement, input architecture, cooling conditions, and control-system requirements.

For replacement applications, the complete catalog number should be compared carefully. A drive with the same current rating is not necessarily an electrically or mechanically identical replacement if its input arrangement, CM-jumper configuration, filtering, feedback, communication, or other options are different.

Overall, the 20G14ND477AN0NNNNN represents a high-power industrial drive solution for applications where a smaller variable-frequency drive would not provide sufficient current or overload capacity.