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Allen-Bradley 20G1AJD740AN4NNNNN PowerFlex 755 AC Drive

1. Product Introduction

The Allen-Bradley 20G1AJD740AN4NNNNN is a high-power PowerFlex 755 air-cooled AC drive designed for large industrial motor-control applications.

It belongs to the PowerFlex 755 series and is intended for high-capacity variable-frequency motor applications where substantial current capability, controlled motor speed, industrial enclosure protection, network communication, and reliable operation are required.

The model is a 480 VAC, three-phase, 740 A class PowerFlex 755 configuration. Its published duty ratings place it at approximately 700 HP for light-duty operation, 650 HP for normal-duty operation, and 500 HP for heavy-duty operation.

This makes the drive suitable for large pumps, fans, blowers, conveyors, mining equipment, cement and aggregate machinery, water and wastewater systems, and large process machines.

The product uses an air-cooled Frame 8 architecture and is configured as an 800 mm deep MCC-style packaged drive with IP54 / NEMA Type 12 protection.

The drive also provides embedded EtherNet/IP, making it suitable for integration into industrial automation networks.

The AN4 configuration is particularly important because it identifies the enhanced LCD full numeric HIM arrangement. This provides a local operator and service interface for commissioning, monitoring, parameter adjustment, troubleshooting, and maintenance.

The model is configured with AC input with precharge, no DC terminals, filtering, CM jumper removed, and no internal dynamic braking transistor.

In practical terms, this is a large industrial drive intended for applications where motor power and current are too high for compact drive platforms and where the drive must form part of a larger electrical and automation system.

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2. Brand and Series

Item	Specification
Brand	Allen-Bradley
Product Family	PowerFlex
Series	PowerFlex 755
Product Type	High-Power AC Variable Frequency Drive
Product Style	PowerFlex 755 AC Packaged Drive
Cooling	Air Cooled
Frame	Frame 8
Voltage Class	480 VAC
Phase	Three Phase
Current Class	740 A
Enclosure	NEMA Type 12
Ingress Protection	IP54
Construction	800 mm Deep MCC Style
Communication	Embedded EtherNet/IP
HIM Configuration	Enhanced LCD Full Numeric HIM
Input Configuration	AC Input with Precharge
DC Terminals	None
Filtering	EMC Filter / Filtered Configuration
CM Jumper	Removed
Dynamic Braking	No Internal Dynamic Braking Transistor
Primary Function	High-Power Motor Speed and Torque Control

The PowerFlex 755 platform is intended for large industrial drive applications where the motor-control system must provide considerably more capability than a small or compact machine drive.

The 20G1AJD740AN4NNNNN is positioned toward the high-current end of the 480 VAC Frame 8 air-cooled PowerFlex 755 range.

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3. Detailed Technical Specifications

Parameter	20G1AJD740AN4NNNNN Specification
Catalog Number	20G1AJD740AN4NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product Type	Air-Cooled AC Drive
Product Configuration	AC Packaged Drive
Input Voltage	480 VAC
Input Phase	3 Phase
Current Class	740 A
Light-Duty Horsepower	700 HP
Normal-Duty Horsepower	650 HP
Heavy-Duty Horsepower	500 HP
Light-Duty Continuous Current	Approx. 800 A
Light-Duty 1-Minute Current	Approx. 880 A
Normal-Duty Continuous Current	Approx. 740 A
Normal-Duty 1-Minute Current	Approx. 817 A
Normal-Duty 3-Second Current	Approx. 1110 A
Heavy-Duty Continuous Current	Approx. 617 A
Heavy-Duty 1-Minute Current	Approx. 926 A
Heavy-Duty 3-Second Current	Approx. 1110 A
Frame Size	Frame 8
Cooling Method	Air Cooled
Enclosure	NEMA Type 12
Ingress Protection	IP54
Cabinet Style	800 mm Deep MCC Style
Input Type	AC Input with Precharge
DC Terminals	No DC Terminals
Filtering	EMC Filter
CM Jumper	Removed
Dynamic Braking	No Internal Dynamic Braking Transistor
Communication	Embedded EtherNet/IP
Local Interface	Enhanced LCD Full Numeric HIM
Drive Duty	Light Duty / Normal Duty / Heavy Duty
Approximate Dimensions	2477 × 600 × 800 mm
Approximate Weight	644 kg
Installation Environment	Indoor Industrial Electrical Installation
Main Application	Large Industrial Motor Control

The drive’s current and horsepower figures should always be evaluated against the actual motor full-load current and application duty.

The 740 A designation does not mean that every application should simply be matched to a 740 A motor. The drive’s usable motor capacity depends on the selected duty classification and the actual operating conditions.

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4. Catalog Number Interpretation

The catalog number 20G1AJD740AN4NNNNN identifies the drive’s family and configuration.

Catalog Number Section	General Meaning
20G	PowerFlex 755 family
1	Product configuration identifier
A	Air-cooled architecture
J	Packaged-drive configuration
D	480 VAC class configuration
740	740 A current class
A	CM jumper removed configuration
N4	Enhanced LCD Full Numeric HIM configuration
NNNNN	Additional configuration positions

The 740 portion identifies the current class and is the most obvious electrical identifier.

The AN4 portion is also important because it differentiates this model from the related AN0 configuration.

The N4 version provides the enhanced LCD full numeric HIM, while the N0 version is the blank/no-HIM arrangement.

This difference is important for procurement, replacement, maintenance, and commissioning because two drives with the same voltage and current rating may have different operator-interface configurations.

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5. Electrical Configuration

The 20G1AJD740AN4NNNNN is designed for 480 VAC three-phase input power.

This voltage class is commonly associated with large industrial motor systems.

The drive converts the incoming AC power into a controlled motor output, allowing motor speed and torque to be adjusted electronically.

The AC input arrangement includes precharge.

The drive does not provide DC terminals in this configuration, so it should be treated as an AC-input packaged drive rather than as a common-DC-bus inverter configuration.

For system designers, this distinction is important when considering multiple-drive DC-bus architectures, regenerative systems, or shared-bus arrangements.

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6. 740 A Current Capability

The most significant characteristic of the 20G1AJD740AN4NNNNN is its 740 A current class.

This places the drive firmly in the large industrial motor-control category.

The drive can be evaluated under three major duty classifications.

Light Duty

The light-duty rating corresponds to approximately 700 HP.

This rating is intended for applications where the motor and mechanical load do not require the higher overload capability associated with more demanding duty classifications.

Large centrifugal pumps and fans can often be candidates for this type of duty, provided the actual motor current and process characteristics are suitable.

Normal Duty

The normal-duty rating is approximately 650 HP.

This is an important rating for general industrial motor applications.

It provides substantial capacity for large pumps, fans, conveyors, process machinery, and other industrial loads with normal acceleration and overload requirements.

Heavy Duty

The heavy-duty rating is approximately 500 HP.

Heavy-duty operation should be considered when the application requires higher starting torque, repeated acceleration, higher transient loading, or more demanding mechanical operation.

The lower horsepower figure under heavy-duty conditions reflects the additional electrical margin required to support the more demanding operating profile.

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7. Duty Rating Comparison

Duty Class	Continuous Current	Short-Time Capability	Approx. Motor Rating	Typical Application
Light Duty	Approx. 800 A	Approx. 880 A / 1 min	700 HP	Fans, pumps, relatively stable loads
Normal Duty	Approx. 740 A	Approx. 817 A / 1 min; approx. 1110 A / 3 sec	650 HP	General industrial machinery
Heavy Duty	Approx. 617 A	Approx. 926 A / 1 min; approx. 1110 A / 3 sec	500 HP	High-torque and demanding loads

The correct duty category should be determined from the actual application.

Motor horsepower should not be used as the only selection parameter.

Motor full-load current, acceleration requirements, overload frequency, load inertia, operating cycle, ambient conditions, and braking requirements should all be considered.

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8. Enhanced LCD Full Numeric HIM

The N4 configuration is one of the defining features of this particular model.

The enhanced LCD full numeric HIM provides a local interface for drive commissioning and maintenance.

For a large Frame 8 drive, local access can be extremely useful because technicians may need to work directly at the equipment during installation or troubleshooting.

Typical uses include:

• Parameter setup.
• Motor data entry.
• Drive status monitoring.
• Fault identification.
• Alarm review.
• Operating-value monitoring.
• Commissioning.
• Maintenance.
• Troubleshooting.
• Local configuration.

The HIM also gives maintenance personnel a convenient way to access drive information without relying entirely on the plant network.

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9. Embedded EtherNet/IP

The 20G1AJD740AN4NNNNN includes embedded EtherNet/IP communication.

This allows the drive to be incorporated into an industrial Ethernet control system.

For a large facility, this can significantly simplify the control architecture.

The drive can exchange operating information with a compatible automation controller or supervisory system.

Typical information may include:

• Run command.
• Stop command.
• Speed reference.
• Frequency reference.
• Actual speed.
• Motor current.
• Drive status.
• Ready status.
• Fault status.
• Alarm information.
• Diagnostic information.
• Parameter-related data.

This is particularly useful where many large motors are controlled from a central automation system.

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10. IP54 / NEMA Type 12 Protection

The drive uses an IP54 / NEMA Type 12 industrial enclosure arrangement.

This is an important advantage for indoor industrial installations.

The enclosure provides protection against dust and other common industrial contaminants while also providing protection against splashing water from multiple directions.

Typical installation environments include:

• Industrial electrical rooms.
• Pump stations.
• Manufacturing plants.
• Process facilities.
• Water-treatment facilities.
• Mining processing facilities.
• Cement plants.
• Material-handling installations.

The enclosure rating should still be evaluated together with temperature, humidity, corrosive substances, altitude, ventilation, and contamination conditions.

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11. Frame 8 Construction

The 20G1AJD740AN4NNNNN uses a Frame 8 construction.

Frame size is important because it affects not only the electrical rating but also the physical dimensions, thermal design, cable routing, installation method, and maintenance requirements.

A 740 A drive is considerably larger than a conventional compact VFD.

The Frame 8 architecture provides the physical structure necessary for the high-current power section.

It is intended for centralized industrial installations rather than small machine-control cabinets.

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12. Dimensions and Weight

Physical Parameter	Approximate Specification
Height	2477 mm
Width	600 mm
Depth	800 mm
Overall Dimensions	Approx. 2477 × 600 × 800 mm
Approximate Weight	644 kg
Frame	Frame 8
Installation Style	800 mm Deep MCC Style
Enclosure	NEMA Type 12
Protection	IP54

The approximate 644 kg weight is an important consideration when planning installation.

A drive of this size normally requires appropriate transportation and lifting equipment.

Floor loading, access routes, mounting arrangements, service clearances, and maintenance access should be considered before the equipment is delivered.

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13. Air-Cooled Design

The drive uses an air-cooled architecture.

For a 740 A drive, heat management is a major design consideration.

The power section produces heat during normal operation, and the cooling system must continuously remove that heat.

The installation therefore needs adequate airflow.

The electrical room or enclosure arrangement should also be evaluated for total heat generation when multiple drives and other electrical equipment are installed in the same space.

Thermal design should consider:

• Ambient temperature.
• Ventilation.
• Airflow.
• Heat rejection.
• Filter condition.
• Dust accumulation.
• Equipment spacing.
• Maintenance requirements.

The air-cooled design provides a practical solution for many large industrial installations without requiring a separate liquid-cooling system.

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14. Filtering and EMC Considerations

The model is configured with an EMC filter.

Variable-frequency drives use high-speed power switching, which naturally generates high-frequency electrical components.

Filtering helps manage electromagnetic interference and supports compatibility with the surrounding electrical system.

For a large industrial installation, however, the filter should be considered only one part of the overall EMC strategy.

The following should also be evaluated:

• Motor cable construction.
• Motor cable length.
• Shielding.
• Grounding.
• Bonding.
• Control wiring.
• Communication wiring.
• Cabinet arrangement.
• Cable separation.
• Installation topology.

A properly engineered installation should consider all of these factors together.

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15. CM Jumper Removed

The 20G1AJD740AN4NNNNN is configured with the CM jumper removed.

This configuration affects common-mode behavior and the relationship between the drive’s electrical system and the grounding environment.

It is therefore relevant to system grounding and EMC design.

When replacing an installed drive, the replacement should match the original CM configuration unless the installation has been specifically reviewed and modified.

This is one reason why matching only the drive horsepower or current rating is not sufficient for a replacement project.

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16. Dynamic Braking Configuration

This configuration does not include an internal dynamic braking transistor.

This is particularly important for high-inertia applications.

During motor deceleration, mechanical energy can be returned to the drive’s DC bus.

If the deceleration is rapid and the load inertia is substantial, the resulting regenerative energy must be managed correctly.

Potentially demanding applications include:

• Large conveyors.
• High-inertia fans.
• Centrifugal equipment.
• Large rotating machinery.
• Certain process machines.
• Repeated start-stop equipment.

If rapid braking is required, the complete braking strategy should be evaluated at the system level.

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17. Main Product Applications

17.1 Large Pump Systems

Large pump systems are among the most suitable applications for this drive.

The drive can regulate motor speed according to process requirements.

This is useful when flow demand changes during operation.

Potential applications include:

• Raw-water pumps.
• High-lift pumps.
• Cooling-water pumps.
• Process pumps.
• Booster pumps.
• Wastewater pumps.
• Circulation pumps.
• Industrial water systems.

The high current capacity allows the drive to control motors much larger than those typically associated with compact drive products.

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17.2 Large Industrial Fans

Large industrial fans can benefit from variable-speed control.

Instead of operating the motor continuously at a fixed speed, the drive can adjust motor speed according to process requirements.

Typical applications include:

• Furnace fans.
• Exhaust fans.
• Industrial ventilation.
• Cooling systems.
• Process-air systems.
• Dust-collection systems.
• Combustion-air fans.

Large fans can have substantial inertia, so acceleration and deceleration settings should be selected carefully.

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17.3 Large Blowers

Large blowers can require significant motor power, particularly in continuous-process applications.

The drive can be considered for:

• Aeration blowers.
• Process-air blowers.
• Industrial ventilation.
• Pneumatic process systems.
• Combustion systems.
• Large air-handling systems.

Variable-speed operation can also provide useful process-control flexibility.

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17.4 Conveyor Systems

Large conveyor systems can require several hundred horsepower.

The drive can provide controlled acceleration and deceleration, helping reduce mechanical shock.

Potential applications include:

• Mining conveyors.
• Cement conveyors.
• Aggregate conveyors.
• Bulk-material conveyors.
• Long belt conveyors.
• Port material-handling systems.
• Heavy industrial production lines.

For long conveyors, network integration can also help coordinate the drive with other equipment.

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18. Mining Applications

Mining equipment often operates under demanding mechanical conditions.

The 20G1AJD740AN4NNNNN can be considered for:

• Ore conveyors.
• Crushers.
• Large pumps.
• Ventilation fans.
• Material-handling equipment.
• Processing machinery.
• Auxiliary plant equipment.

The industrial enclosure and high-current architecture are appropriate for centralized electrical installations associated with heavy industrial processes.

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19. Cement and Aggregate Applications

Cement and aggregate plants contain many large motor loads.

The drive can be applied to:

• Large conveyors.
• Crushers.
• Fans.
• Dust-collection systems.
• Process pumps.
• Material-handling equipment.
• Large rotating machinery.

The combination of high motor capacity and network communication is useful when multiple process machines must operate as part of a coordinated production system.

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20. Water and Wastewater Applications

Large water and wastewater facilities often use high-power pumps and blowers.

Typical applications include:

• Raw-water pumping.
• High-lift pumping.
• Wastewater transfer.
• Aeration blowers.
• Sludge handling.
• Process-water circulation.
• Large booster systems.

The embedded Ethernet capability can also be useful when the drive needs to communicate with a centralized control system.

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21. Process Manufacturing

The drive is suitable for large process machinery where motor speed must be controlled according to production requirements.

Possible applications include:

• Large mixers.
• Process fans.
• Large pumps.
• Material-handling equipment.
• Rotating process machines.
• Production-line equipment.
• Auxiliary process machinery.

The drive’s high-current capability makes it particularly useful where motor requirements exceed the practical range of smaller drive families.

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22. Main Product Advantages

22.1 High 740 A Current Class

The primary advantage is the high current capacity.

The 740 A class makes the drive suitable for large motors and high-power mechanical systems.

This is one of the main reasons to select the PowerFlex 755 architecture instead of a smaller machine-oriented drive.

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22.2 700 HP Light-Duty Capability

The approximate 700 HP light-duty rating allows the drive to address very large motors under appropriate operating conditions.

This is especially useful for large pumps and fans where the load profile is comparatively stable.

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22.3 650 HP Normal-Duty Capability

The 650 HP normal-duty rating makes the drive suitable for a broad range of general industrial machinery.

This provides a useful balance between motor capacity and typical industrial operating conditions.

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22.4 500 HP Heavy-Duty Capability

The 500 HP heavy-duty rating provides substantial capacity for demanding mechanical applications.

It is relevant to applications involving higher starting torque, greater acceleration requirements, and more severe overload conditions.

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22.5 Enhanced Local HIM

The N4 configuration provides the enhanced LCD full numeric HIM.

This is a practical advantage for:

• Commissioning.
• Maintenance.
• Troubleshooting.
• Parameter adjustment.
• Local monitoring.

For large equipment, local access can reduce the time required for service personnel to diagnose drive conditions.

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22.6 Embedded EtherNet/IP

Embedded EtherNet/IP simplifies integration with industrial control networks.

For facilities containing multiple drives, this can reduce the amount of dedicated hardwired control wiring required for basic drive status and command functions.

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22.7 Industrial Enclosure

The IP54 / NEMA Type 12 enclosure provides a packaged industrial configuration suitable for many indoor electrical environments.

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22.8 Large Frame Construction

Frame 8 construction provides the physical platform required for the drive’s high current rating.

This makes the product suitable for large industrial installations where compact drives would not be practical.

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22.9 Broad Application Range

The drive can be applied across many industries rather than being limited to one machine type.

Its strongest application areas include:

• Water.
• Wastewater.
• Mining.
• Cement.
• Aggregate.
• Manufacturing.
• Material handling.
• Process industries.
• Large pumping.
• Industrial ventilation.

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23. Five Recommended PowerFlex 755 Related Models

The following models are useful for comparing current capacity and motor-duty requirements within the same general PowerFlex 755 family.

Model	Voltage	Current	LD HP	ND HP	HD HP	Frame	Cooling	HIM
20G1AJD545AN4NNNNN	480 VAC 3PH	545 A	500 HP	450 HP	350 HP	8	Air	Enhanced LCD Full Numeric
20G1AJD617AN4NNNNN	480 VAC 3PH	617 A	600 HP	500 HP	400 HP	8	Air	Enhanced LCD Full Numeric
20G1AJD710AN4NNNNN	480 VAC 3PH	710 A	650 HP	600 HP	450 HP	8	Air	Enhanced LCD Full Numeric
20G1AJD740AN0NNNNN	480 VAC 3PH	740 A	700 HP	650 HP	500 HP	8	Air	Blank / No HIM
20G1AJD740JN4NNNNN	480 VAC 3PH	740 A	700 HP	650 HP	500 HP	8	Air	Enhanced LCD Full Numeric

These models are particularly useful for comparison because they stay within the same high-power PowerFlex 755 product family.

The 545 A, 617 A, 710 A, and 740 A models provide a practical progression for motor-current selection.

The 740 A AN0 and JN4 models show how the same basic electrical capacity can be configured differently depending on the CM jumper and local operator-interface requirements.

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24. Five Related Models – Expanded Parameter Comparison

Model	Current Class	LD Rating	ND Rating	HD Rating	Voltage	Frame	Enclosure	Communication
20G1AJD545AN4NNNNN	545 A	500 HP	450 HP	350 HP	480 VAC 3PH	8	IP54 / NEMA 12	Embedded EtherNet/IP
20G1AJD617AN4NNNNN	617 A	600 HP	500 HP	400 HP	480 VAC 3PH	8	IP54 / NEMA 12	Embedded EtherNet/IP
20G1AJD710AN4NNNNN	710 A	650 HP	600 HP	450 HP	480 VAC 3PH	8	IP54 / NEMA 12	Embedded EtherNet/IP
20G1AJD740AN0NNNNN	740 A	700 HP	650 HP	500 HP	480 VAC 3PH	8	IP54 / NEMA 12	Embedded EtherNet/IP
20G1AJD740JN4NNNNN	740 A	700 HP	650 HP	500 HP	480 VAC 3PH	8	IP54 / NEMA 12	Embedded EtherNet/IP

The 20G1AJD740AN4NNNNN is the highest-current model in this comparison group while also providing the enhanced local operator interface.

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25. Related 740 A Configurations

The 740 A class is available in several closely related configurations.

Model	Current	HIM	CM Jumper	Voltage	Frame	General Configuration
20G1AJD740AN0NNNNN	740 A	Blank / No HIM	Removed	480 VAC 3PH	8	Standard N0 configuration
20G1AJD740AN4NNNNN	740 A	Enhanced LCD Full Numeric	Removed	480 VAC 3PH	8	Enhanced local interface
20G1AJD740JN0NNNNN	740 A	Blank / No HIM	Installed	480 VAC 3PH	8	CM jumper installed
20G1AJD740JN4NNNNN	740 A	Enhanced LCD Full Numeric	Installed	480 VAC 3PH	8	Enhanced HIM and CM jumper installed

For replacement applications, these differences should be checked carefully.

The AN4 model is particularly useful when local commissioning and maintenance are important.

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26. Five Popular Allen-Bradley Models for Broader Comparison

Model	Product Family	Product Type	Typical Capacity / Class	Typical Application	Main Feature
25B-D030N114	PowerFlex 525	Compact AC Drive	Approx. 30 A class	Pumps, fans, conveyors, machine automation	Compact variable-frequency control
25C-D030N114	PowerFlex 523	Compact AC Drive	Approx. 30 A class	Compact machinery	Machine-level motor control
20G1AGE053JA0NNNNN	PowerFlex 755	AC Drive	High-Power Industrial	Pumps, fans, process equipment	High-performance motor control
20G1AGC260JN0NNNNN	PowerFlex 755	AC Drive	High-Current Industrial	Large industrial machinery	High-power drive platform
20G1AND302JA0NNNNN	PowerFlex 755	AC Drive	High-Power Industrial	Large motors and process machinery	Industrial variable-speed control

The first two models are more suitable for compact machine applications.

The PowerFlex 755 models are intended for substantially larger motor systems.

For an application in the 500–700 HP range, the PowerFlex 755 family is the more appropriate comparison group.

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27. Product Application Matrix

Application	Suitability	Main Reason
Large centrifugal pump	Excellent	High current and variable-speed operation
Large process pump	Excellent	Large motor capacity
High-lift pump	Excellent	High-power continuous operation
Industrial fan	Excellent	Variable-speed control and high motor capacity
Large blower	Excellent	High-power continuous load
Mining conveyor	Excellent	Large motor and controlled acceleration
Cement conveyor	Excellent	High-power material handling
Aggregate conveyor	Excellent	High-current motor control
Water-treatment system	Excellent	Large pumps and network integration
Wastewater blower	Excellent	Large continuous-duty motor
Process machine	Very Good	High-power variable-speed control
Crusher	Suitable with duty analysis	High mechanical loading
Small machine	Poor Fit	Excessive capacity
Portable machine	Poor Fit	Large size and approximately 644 kg weight
Compact OEM panel	Generally unsuitable	Frame 8 physical size

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28. Installation and Mechanical Considerations

The physical size of the 20G1AJD740AN4NNNNN should be taken seriously during project planning.

The approximate dimensions are:

2477 mm × 600 mm × 800 mm

The approximate weight is:

644 kg

This means the drive should normally be treated as major industrial electrical equipment.

Installation planning should include:

• Floor loading.
• Mounting structure.
• Lifting equipment.
• Transportation route.
• Doorway clearance.
• Service access.
• Cable-entry space.
• Motor cable routing.
• Incoming power routing.
• Grounding.
• Ventilation.
• Heat dissipation.
• Network cable routing.
• Maintenance access.

A suitable lifting and transportation method should be planned before the equipment arrives at the installation site.

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29. Thermal and Environmental Considerations

Because the drive is air cooled, adequate airflow must be maintained.

The surrounding environment should be evaluated for:

• Temperature.
• Dust.
• Humidity.
• Corrosive gases.
• Altitude.
• Airflow.
• Heat accumulation.
• Maintenance access.

The NEMA Type 12 / IP54 enclosure provides protection for many indoor industrial environments, but it does not eliminate the need for appropriate environmental engineering.

In a room containing multiple large drives, the combined heat output can become significant.

The total electrical-room cooling requirement should therefore be evaluated at the system level.

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30. Motor Cable and Grounding Considerations

A 740 A drive represents a substantial motor-power installation.

Motor cable selection should consider:

• Full-load current.
• Cable length.
• Installation method.
• Temperature.
• Cable grouping.
• Insulation rating.
• Grounding.
• EMC requirements.
• Shielding.
• Motor characteristics.

Long motor cables can also affect common-mode current and electromagnetic compatibility.

The CM jumper removed configuration should therefore be considered together with the overall grounding and bonding strategy.

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31. Control System Integration

A typical installation can integrate the drive with:

• Industrial controllers.
• EtherNet/IP networks.
• Operator interfaces.
• Supervisory control systems.
• Process instrumentation.
• Motor protection systems.
• Plant-level monitoring systems.

The drive can receive speed and operating commands through the automation network and return operating status and diagnostic information.

For large facilities, this architecture can simplify centralized monitoring of pumps, fans, conveyors, blowers, and other motor-driven equipment.

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32. Local Commissioning

The enhanced LCD full numeric HIM makes this particular configuration well suited to local commissioning.

During initial startup, technicians may need to review:

• Motor nameplate data.
• Motor-control parameters.
• Speed reference.
• Acceleration time.
• Deceleration time.
• Current limits.
• Protection settings.
• Control modes.
• Network settings.
• Fault conditions.

The local HIM provides direct access to the drive during these activities.

This is especially valuable when commissioning equipment before the complete plant automation network has been placed into service.

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33. Maintenance Advantages

The N4 configuration provides a practical local interface for maintenance personnel.

When a large industrial motor stops unexpectedly, the drive may be one of several possible causes.

Technicians may need to distinguish between:

• Incoming power problems.
• Motor problems.
• Mechanical overload.
• Control-system commands.
• Network communication issues.
• Drive faults.
• Thermal conditions.
• Parameter problems.

Local drive information can help reduce the time required to identify the operating condition.

Combined with embedded EtherNet/IP, the drive can provide both local and network-based access to operating information.

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34. Advantages for System Integrators

For system integrators, the 20G1AJD740AN4NNNNN offers several practical advantages.

The high current capacity allows the same general drive platform to be used for large motor applications.

Embedded EtherNet/IP reduces the complexity of network integration.

The N4 HIM provides a local commissioning interface.

The packaged IP54 / NEMA Type 12 configuration provides a more complete industrial installation arrangement than an exposed drive chassis.

The Frame 8 platform is suitable for centralized high-power electrical systems.

Together, these features make the drive a practical choice for large process and infrastructure projects.

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35. Advantages for Plant Operators

For plant operators, the primary benefit is controlled motor operation.

Variable-frequency control allows the motor to operate according to process requirements rather than simply running at fixed speed.

Depending on the application, this can provide:

• Better process control.
• Smoother acceleration.
• Smoother deceleration.
• Reduced mechanical shock.
• Flexible production operation.
• Easier centralized control.
• Better visibility of drive status.
• Easier integration with automatic control strategies.

For large motors, these benefits can have a significant effect on overall process operation.

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36. Selection Comparison: 710 A vs. 740 A

Parameter	20G1AJD710AN4NNNNN	20G1AJD740AN4NNNNN
Voltage	480 VAC 3PH	480 VAC 3PH
Current Class	710 A	740 A
LD Rating	650 HP	700 HP
ND Rating	600 HP	650 HP
HD Rating	450 HP	500 HP
Frame	8	8
Cooling	Air	Air
Enclosure	IP54 / NEMA 12	IP54 / NEMA 12
Construction	800 mm Deep MCC Style	800 mm Deep MCC Style
HIM	Enhanced LCD Full Numeric	Enhanced LCD Full Numeric
EtherNet/IP	Embedded	Embedded
CM Jumper	Removed	Removed
Dynamic Braking	None	None
Approx. Dimensions	Large Frame 8	Approx. 2477 × 600 × 800 mm
Approx. Weight	Approx. 644 kg class	Approx. 644 kg

The 740 A model provides additional current and horsepower capacity over the 710 A configuration.

This makes it particularly useful when a motor is close to the upper limit of the 710 A selection.

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37. Selection Comparison: 617 A vs. 740 A

Parameter	20G1AJD617AN4NNNNN	20G1AJD740AN4NNNNN
Voltage	480 VAC 3PH	480 VAC 3PH
Current	617 A	740 A
LD Rating	600 HP	700 HP
ND Rating	500 HP	650 HP
HD Rating	400 HP	500 HP
Frame	8	8
Cooling	Air	Air
Enclosure	IP54 / NEMA 12	IP54 / NEMA 12
HIM	Enhanced LCD Full Numeric	Enhanced LCD Full Numeric
EtherNet/IP	Embedded	Embedded
CM Jumper	Removed	Removed
Main Difference	Lower current class	Higher current class

The 740 A configuration is a natural selection when the 617 A class does not provide sufficient motor-current capacity.

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38. Recommended Model Selection by Motor Class

Approximate Application Requirement	Suggested Model
Around 350 HP HD / 450 HP ND	20G1AJD545AN4NNNNN
Around 400 HP HD / 500 HP ND	20G1AJD617AN4NNNNN
Around 450 HP HD / 600 HP ND	20G1AJD710AN4NNNNN
Around 500 HP HD / 650 HP ND	20G1AJD740AN4NNNNN
Higher current than Frame 8 range	Larger-frame PowerFlex architecture

This progression provides a practical starting point for evaluating large 480 VAC motors.

The final drive should always be selected from actual motor current and application duty rather than from horsepower alone.

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39. Replacement Considerations

The 20G1AJD740AN4NNNNN is an older PowerFlex 755 configuration and has been discontinued.

The corresponding direct replacement configuration is identified as 20G1AJD740JN4NNNNN.

For replacement purposes, the transition should not be handled as a simple “same horsepower” substitution.

The following items should be checked:

• Input voltage.
• Motor current.
• Duty rating.
• Frame.
• Enclosure.
• HIM configuration.
• CM jumper configuration.
• Filtering.
• Dynamic braking.
• Communication.
• Physical dimensions.
• Cable arrangement.
• Mounting.
• Ventilation.
• Maintenance access.

The AN4 to JN4 change is particularly important because the CM jumper configuration changes.

A replacement project should therefore verify the complete installation requirements before the replacement drive is commissioned.

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40. Five Related Models – Full Comparison

Model	Voltage	Current	LD HP	ND HP	HD HP	Frame	Enclosure	HIM	Approx. Dimensions / Weight
20G1AJD545AN4NNNNN	480 VAC 3PH	545 A	500 HP	450 HP	350 HP	8	IP54 / NEMA 12	Enhanced LCD	Large Frame 8
20G1AJD617AN4NNNNN	480 VAC 3PH	617 A	600 HP	500 HP	400 HP	8	IP54 / NEMA 12	Enhanced LCD	Large Frame 8
20G1AJD710AN4NNNNN	480 VAC 3PH	710 A	650 HP	600 HP	450 HP	8	IP54 / NEMA 12	Enhanced LCD	Approx. 2477 × 600 × 800 mm / 644 kg class
20G1AJD740AN0NNNNN	480 VAC 3PH	740 A	700 HP	650 HP	500 HP	8	IP54 / NEMA 12	Blank / No HIM	Approx. 2477 × 600 × 800 mm / 644 kg
20G1AJD740JN4NNNNN	480 VAC 3PH	740 A	700 HP	650 HP	500 HP	8	IP54 / NEMA 12	Enhanced LCD	Approx. 2477 × 600 × 800 mm / 644 kg class

These five models provide a useful selection range for large 480 VAC PowerFlex 755 applications.

The 20G1AJD740AN4NNNNN is distinguished by its combination of the highest current rating in this group and the enhanced local HIM.

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41. Five Popular Models of the Same Brand

Model	Series / Family	Product Type	Voltage / Class	Main Application	Key Characteristics
25B-D030N114	PowerFlex 525	Compact AC Drive	Low / Medium Power	Machine automation, pumps, fans	Compact variable-frequency drive
25C-D030N114	PowerFlex 523	Compact AC Drive	Low / Medium Power	Compact machinery	Simple machine-level motor control
20G1AGE053JA0NNNNN	PowerFlex 755	Industrial AC Drive	600 VAC class	Large industrial motors	High-performance motor control
20G1AGC260JN0NNNNN	PowerFlex 755	Industrial AC Drive	High-current class	Large process machinery	High-power industrial drive
20G1AND302JA0NNNNN	PowerFlex 755	Industrial AC Drive	High-power class	Large industrial machinery	Large-motor variable-speed control

These models cover a broad range of motor-control applications.

The PowerFlex 525 and PowerFlex 523 families are better suited to smaller machine applications.

The PowerFlex 755 family is intended for larger and more demanding industrial motor systems.

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42. Main Advantages at a Glance

Advantage	Engineering Benefit
740 A current class	Very large motor capacity
700 HP LD	High capacity for light-duty loads
650 HP ND	Strong general industrial capability
500 HP HD	Suitable for demanding loads
480 VAC 3PH	Industrial high-power supply compatibility
Frame 8	High-current drive architecture
Air cooled	Practical thermal management
IP54	Industrial environmental protection
NEMA Type 12	Suitable for many indoor industrial areas
Embedded EtherNet/IP	Networked control and monitoring
Enhanced LCD HIM	Local commissioning and troubleshooting
EMC filter	Supports EMC-conscious installations
AC precharge	Controlled DC-link energization
CM jumper removed	Defined common-mode configuration
Packaged construction	Practical centralized installation
Broad applications	Pumps, fans, blowers, conveyors, process machinery

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43. Engineering Advantages of the N4 Configuration

The N4 configuration is particularly valuable when the drive will be serviced by technicians directly at the equipment.

Compared with a blank-HIM configuration, the enhanced local interface provides an immediate point of access for commissioning and maintenance.

This can be useful when:

• The network is not yet operational.
• The controller is offline.
• A technician needs to verify parameters locally.
• A fault must be investigated at the drive.
• Motor data must be entered during commissioning.
• Operating values need to be checked at the equipment.
• Maintenance personnel require direct access to drive information.

For large industrial machinery, these functions can save significant troubleshooting time.

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44. Overall Product Evaluation

The 20G1AJD740AN4NNNNN is a high-power industrial AC drive intended for applications where a large motor must be controlled reliably and integrated into a larger automation system.

Its principal strengths are:

• High 740 A current capacity.
• Up to approximately 700 HP light-duty operation.
• Up to approximately 650 HP normal-duty operation.
• Up to approximately 500 HP heavy-duty operation.
• 480 VAC three-phase architecture.
• Frame 8 construction.
• IP54 / NEMA Type 12 enclosure.
• 800 mm deep MCC-style construction.
• Air cooling.
• Embedded EtherNet/IP.
• Enhanced LCD full numeric HIM.
• Filtered configuration.
• AC input with precharge.

These characteristics make it particularly appropriate for large industrial equipment rather than small machine applications.

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45. Final Technical Specification Summary

Category	Specification
Model	20G1AJD740AN4NNNNN
Brand	Allen-Bradley
Product Family	PowerFlex
Series	PowerFlex 755
Product Type	Air-Cooled AC Drive
Product Style	PowerFlex 755 AC Packaged Drive
Input Voltage	480 VAC
Phase	3 Phase
Current	740 A
Light-Duty Rating	700 HP
Normal-Duty Rating	650 HP
Heavy-Duty Rating	500 HP
Frame	Frame 8
Cooling	Air Cooled
Enclosure	NEMA Type 12
Protection	IP54
Construction	800 mm Deep MCC Style
Communication	Embedded EtherNet/IP
HIM	Enhanced LCD Full Numeric
Input	AC Input with Precharge
DC Terminals	None
Filtering	EMC Filter
CM Jumper	Removed
Dynamic Braking	No Internal Dynamic Braking Transistor
Approx. Dimensions	2477 × 600 × 800 mm
Approx. Weight	644 kg
Main Applications	Pumps, fans, blowers, conveyors, mining, cement, water/wastewater, process machinery
Main Advantage	High-current industrial motor control with integrated networking and local operator interface

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46. Conclusion

The Allen-Bradley 20G1AJD740AN4NNNNN PowerFlex 755 is a high-capacity industrial AC drive designed for large 480 VAC three-phase motor applications.

With a 740 A current class, it provides approximately 700 HP light-duty, 650 HP normal-duty, and 500 HP heavy-duty motor capability.

Its Frame 8, air-cooled, IP54 / NEMA Type 12, and 800 mm deep MCC-style construction make it suitable for large centralized industrial electrical installations.

The drive’s embedded EtherNet/IP communication allows it to be incorporated into a modern industrial automation network.

The N4 enhanced LCD full numeric HIM is one of the most useful features of this particular catalog configuration. It provides local access for commissioning, monitoring, parameter adjustment, fault diagnosis, and maintenance.

The AC input with precharge, no DC terminals, EMC filtering, and CM jumper removed configuration should all be taken into account during electrical-system design.

The absence of an internal dynamic braking transistor is also important when the application involves rapid deceleration or high-inertia loads.

The drive is particularly well suited to:

• Large water and wastewater pumps.
• High-capacity process pumps.
• Industrial fans.
• Large blowers.
• Mining conveyors.
• Cement and aggregate equipment.
• Heavy material-handling systems.
• Large process machinery.
• Industrial rotating equipment.

From a practical engineering perspective, the 20G1AJD740AN4NNNNN is best viewed as a complete high-power motor-control platform rather than simply a variable-frequency inverter.

Its combination of high current capacity, flexible duty ratings, industrial enclosure protection, large-frame construction, embedded EtherNet/IP, and enhanced local HIM makes it suitable for demanding industrial installations where reliability, controllability, and maintainability are important.

The approximate physical size of 2477 × 600 × 800 mm and approximate weight of 644 kg should be incorporated into mechanical handling, transportation, floor-loading, ventilation, cable-routing, and maintenance planning.

For replacement work, the complete catalog number should always be checked rather than selecting a drive only by horsepower or current. In particular, the N4 HIM configuration, CM jumper configuration, filtering, dynamic-braking arrangement, voltage class, enclosure, and frame should all be matched to the existing installation.

Overall, the 20G1AJD740AN4NNNNN represents a high-power PowerFlex 755 solution for large-scale industrial motor control, especially where the application requires substantial motor current, variable-speed operation, network integration, local commissioning capability, and an industrial packaged-drive construction.