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Allen-Bradley 20G1AJF265JN4NNNNN PowerFlex 755 AC Drive

1. Product Overview

The Allen-Bradley 20G1AJF265JN4NNNNN is a high-power PowerFlex 755 AC Drive designed for large industrial motor-control applications where high motor power, reliable variable-speed control, network integration, overload capability, and enclosed industrial construction are required.

This model is a 690 VAC, three-phase, 265 A, Frame 8, air-cooled PowerFlex 755 drive. It is configured with AC input and precharge, has no DC input terminals, includes embedded EtherNet/IP, and uses an IP54 / NEMA Type 12, 800 mm deep MCC-style enclosure.

The model is configured with filtering and a common-mode jumper installed. It also includes the JN4-style configuration with an enhanced local operator interface, making it particularly suitable for installations where technicians need direct access to drive parameters, operating status, diagnostics, commissioning functions and fault information.

The 20G1AJF265JN4NNNNN is positioned in the high-voltage, high-power section of the PowerFlex 755 family. Compared with 600 VAC PowerFlex 755 configurations, the 690 VAC architecture is especially useful for large industrial motors where a higher motor voltage allows the required motor power to be handled with lower operating current than an equivalent lower-voltage system.

The model is intended primarily for large industrial installations rather than small machine-control applications. Typical applications include large pumps, fans, blowers, conveyors, compressors, mixers, process machinery, material-handling systems, water and utility equipment, and other large motor-driven machinery.

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2. Product Identification

Parameter	Specification
Brand	Allen-Bradley
Product Series	PowerFlex 755
Product Type	High-Power Air-Cooled AC Drive
Catalog Number	20G1AJF265JN4NNNNN
Sub-Type	PowerFlex 755 AC Packaged Drive
Input Voltage Class	690 VAC
Input Phase	Three Phase
Rated Current	265 A
Light-Duty Power	Approximately 315 kW
Normal-Duty Power	Approximately 250 kW
Heavy-Duty Power	Approximately 200 kW
Frame Size	Frame 8
Cooling	Forced Air
Input Architecture	AC Input with Precharge
DC Terminals	None
Communication	Embedded EtherNet/IP
Filtering	Filtered
Common-Mode Configuration	CM Jumper Installed
Dynamic Braking	None
Enclosure	IP54 / NEMA Type 12
Cabinet Style	800 mm Deep MCC Style
Local Interface	Enhanced LCD / Full-Numeric HIM Configuration
Installation	Floor-Mounted
Primary Function	Variable-Speed Control of Large AC Motors

The product belongs to the PowerFlex 755 series, which is designed for applications requiring considerably more functionality and power capability than compact machine-oriented variable-frequency drives.

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3. Product Series

The 20G1AJF265JN4NNNNN belongs to the PowerFlex 755 AC Drive series.

PowerFlex 755 is an architecture-class drive platform intended for large and demanding motor-control systems.

The series is designed to support a wide range of motor-control applications, from pumps and fans to conveyors, compressors and process machinery.

The 20G1AJF265JN4NNNNN is a particularly large configuration within the family because it combines:

• 690 VAC input.
• 265 A output current.
• Frame 8 construction.
• IP54 / NEMA Type 12 enclosure.
• 800 mm deep MCC-style cabinet.
• Embedded EtherNet/IP.
• Local enhanced operator interface.
• Forced-air cooling.

This combination makes it suitable for centralized industrial electrical installations.

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4. Detailed Electrical Specifications

Electrical Parameter	Specification
Catalog Number	20G1AJF265JN4NNNNN
Nominal Input Voltage	690 VAC
Input Voltage Class	690 VAC
Input Phase	Three Phase
Input Frequency	50/60 Hz class
Nominal Output Current	265 A
Light-Duty Power Rating	Approximately 315 kW
Normal-Duty Power Rating	Approximately 250 kW
Heavy-Duty Power Rating	Approximately 200 kW
Input Architecture	AC Input with Precharge
DC Input Terminals	None
Output	Three-Phase Variable-Frequency AC
Cooling	Forced Air
Frame	8
Filtering	Filtered
CM Jumper	Installed
Dynamic Braking	None
Communication	Embedded EtherNet/IP
Enclosure	IP54 / NEMA Type 12
Cabinet Depth	800 mm class
Local HIM	Enhanced LCD / Full-Numeric

The most important electrical characteristic is the 690 VAC / 265 A combination.

This voltage class allows the drive to serve large industrial motors while maintaining a comparatively moderate current level for the amount of power being controlled.

The drive provides approximately 315 kW Light-Duty, 250 kW Normal-Duty, and 200 kW Heavy-Duty capacity.

These three ratings should not be interpreted as three independent motor ratings that can be selected without regard to the load.

The correct rating depends on the motor’s rated current, operating profile, torque requirements, acceleration requirements and overload conditions.

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5. Duty Rating

The PowerFlex 755 uses different duty classifications because industrial motors do not all operate under the same mechanical conditions.

A variable-torque pump or fan normally places a different demand on a drive than a conveyor, crusher or heavily loaded mixer.

The Light-Duty rating of approximately 315 kW is appropriate for applications where the motor load is comparatively moderate and overload demand is limited.

The Normal-Duty rating of approximately 250 kW is intended for general industrial operation.

The Heavy-Duty rating of approximately 200 kW is intended for applications requiring greater torque and overload capability.

For engineering purposes, motor current should be treated as the primary sizing parameter.

Horsepower or kilowatt rating alone should not be used to select the drive.

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6. Mechanical Specifications

Mechanical Parameter	Specification
Catalog Number	20G1AJF265JN4NNNNN
Frame	8
Enclosure	IP54 / NEMA Type 12
Cabinet Style	MCC Style
Nominal Cabinet Depth	800 mm
Approximate Cabinet Height	2477 mm class
Approximate Cabinet Width	600 mm class
Approximate Cabinet Depth	800 mm class
Approximate Filtered Depth	Up to approximately 898 mm depending on configuration
Approximate Equipment Weight	Approximately 600–650 kg class
Installation	Floor-Mounted
Cooling	Forced Air
Service Access	Front/service access
Local Interface	Enhanced LCD / Full-Numeric HIM
HIM Protection	IP66 / NEMA Type 4X/12 class

The Frame 8 enclosure is a large industrial cabinet.

A practical reference envelope for this class of IP54 MCC-style construction is approximately 2477 mm high × 600 mm wide × 800 mm deep.

Depending on the final filtering and cabinet arrangement, the effective depth can be greater.

For planning purposes, the equipment should be treated as a heavy industrial cabinet in the approximately 600–650 kg class.

The exact shipping weight can vary with the final packaged configuration, cabinet accessories and transportation packaging. The final mechanical drawing and equipment documentation should therefore be used when calculating foundation loads, lifting requirements and transportation arrangements.

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7. Physical Construction

The 20G1AJF265JN4NNNNN is significantly larger than compact PowerFlex drives.

Its Frame 8 construction is designed for high-power industrial installations.

The cabinet-style arrangement provides space for the power section, cooling system, control components, protection elements, communication hardware and operator-interface equipment.

The approximately 800 mm cabinet depth also provides practical space for high-power electrical connections and internal components.

This makes the product particularly suitable for electrical rooms and MCC lineups.

It is less suitable for small machine cabinets where enclosure space is limited.

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8. 690 VAC Electrical Platform

The 690 VAC rating is one of the defining characteristics of the 20G1AJF265JN4NNNNN.

At high motor power levels, increasing the operating voltage can reduce the current required to deliver a given amount of motor power.

This is useful in large industrial installations because conductor sizing, switchgear current capacity and overall power-distribution architecture can be affected by motor current.

The 690 VAC class is therefore commonly associated with large industrial motors and large rotating equipment.

Typical applications can include:

• Large pumps.
• Large fans.
• Industrial blowers.
• Conveyors.
• Compressors.
• Process machinery.
• Marine and heavy industrial equipment.
• Large material-handling systems.

The actual motor voltage must always match the motor and system electrical design.

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9. Embedded EtherNet/IP

The drive includes embedded EtherNet/IP communication.

This provides an important connection between the drive and the wider industrial automation system.

A typical control system can exchange information such as:

• Start commands.
• Stop commands.
• Speed references.
• Drive status.
• Output current.
• Motor speed.
• Fault information.
• Warning information.
• Diagnostic information.
• Operating parameters.

This allows the drive to function as an integrated part of a modern automated production system.

For large plants, this can simplify drive monitoring and reduce the amount of conventional point-to-point control wiring required.

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10. Local Operator Interface

The JN4 configuration provides an enhanced local operator interface.

This is one of the practical differences between JN4 and simpler configurations.

The local interface can be used during:

• Commissioning.
• Parameter setup.
• Routine maintenance.
• Fault diagnosis.
• Motor testing.
• Drive replacement.
• Troubleshooting.

A technician can interact directly with the drive rather than relying entirely on the plant control system.

The protected operator interface is also suitable for industrial installations where the drive is installed in an enclosed electrical area.

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11. Input Configuration

The 20G1AJF265JN4NNNNN uses an AC input with precharge.

The precharge system controls the initial charging of the drive’s DC-link capacitors when the drive is energized.

This is particularly important for large drives because the DC-link capacitors represent a substantial electrical load during startup.

The catalog configuration also specifies no DC terminals.

Therefore, this configuration is intended primarily for conventional AC input rather than external DC input or common-DC-bus applications.

If a project requires regenerative operation or a common DC-bus architecture, another configuration should be evaluated.

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12. Filtering and Common-Mode Configuration

The drive uses a filtered configuration.

Input filtering can be useful in industrial environments where electromagnetic compatibility and power-quality considerations are important.

The model also specifies the common-mode jumper installed configuration.

This setting should be considered when designing grounding and motor-cable arrangements.

Correct grounding is especially important with high-power variable-frequency drives.

Motor cables, cabinet grounding, protective earth, shields and bonding should all be installed according to the electrical design requirements for the installation.

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13. IP54 / NEMA Type 12 Enclosure

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

This is well suited to industrial electrical rooms where equipment needs protection against dust and certain forms of incidental liquid exposure.

Typical environments include:

• Manufacturing facilities.
• Process plants.
• Water treatment facilities.
• Utility plants.
• Material-handling facilities.
• Industrial MCC rooms.

The enclosure improves environmental protection compared with open-type drive arrangements.

However, the enclosure should not be considered suitable for every harsh environment without further evaluation.

Corrosive chemicals, conductive dust, salt-laden air, excessive humidity and extreme temperatures should be considered separately.

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14. Forced-Air Cooling

The 20G1AJF265JN4NNNNN uses forced-air cooling.

At this power level, the drive produces substantial heat during normal operation.

The cooling fans and airflow system remove heat from the power section and maintain acceptable operating temperatures.

The installation room must therefore provide adequate ventilation.

The cooling system should be checked periodically for:

• Fan operation.
• Abnormal fan noise.
• Blocked airflow.
• Dust accumulation.
• Excessive cabinet temperature.
• Cooling-system alarms.
• Signs of thermal stress.

Good thermal management is one of the most important factors in maintaining the reliability of a large industrial drive.

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15. Product Introduction

The Allen-Bradley 20G1AJF265JN4NNNNN PowerFlex 755 is a high-power variable-frequency drive intended for large three-phase motors.

It combines a 690 VAC input platform with a 265 A output class and Frame 8 mechanical construction.

The result is a drive designed for applications where both the electrical and physical scale of the motor system are substantial.

The product is particularly attractive for industrial plants that need:

• Large motor capacity.
• Variable-speed control.
• Network communication.
• Local operator access.
• Industrial enclosure protection.
• High-power cooling.
• Centralized MCC installation.

The PowerFlex 755 platform also allows the same drive family to be used across a broad range of motor capacities, which can simplify standardization across large plants.

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16. Main Product Advantages

16.1 High-Power 690 VAC Operation

The 690 VAC platform is particularly useful for large industrial motors.

It provides a practical solution for high-power equipment where lower-voltage systems would require substantially higher current.

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16.2 265 A Output Capability

The 265 A output class provides substantial capacity for large motors.

This makes the drive suitable for many hundreds-of-kilowatts industrial applications.

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16.3 Multiple Duty Ratings

The Light-Duty, Normal-Duty and Heavy-Duty classifications provide flexibility.

Engineers can match the drive to the actual mechanical load rather than relying only on a single horsepower value.

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16.4 Embedded EtherNet/IP

Network communication is built into the drive architecture.

This makes integration with an industrial automation system more straightforward.

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16.5 Enhanced Local Operator Interface

The JN4 configuration provides a convenient local interface for maintenance and commissioning.

This is particularly useful for large drives installed in electrical rooms where direct access is preferred during service work.

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16.6 IP54 / NEMA Type 12 Construction

The enclosed cabinet provides improved environmental protection for industrial installations.

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16.7 Frame 8 Architecture

Frame 8 construction provides the physical capacity required for high-power electrical components.

It also allows the drive to be incorporated into large MCC-style installations.

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16.8 High-Voltage Industrial Platform

The 690 VAC architecture is particularly suitable for large motors and centralized industrial power systems.

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17. Application: Large Pumps

Large pumps are an important application for the 20G1AJF265JN4NNNNN.

The drive can control motor speed according to flow and process requirements.

Typical applications include:

• Water treatment.
• Industrial water circulation.
• Cooling-water systems.
• Large process pumps.
• Irrigation systems.
• Utility pumping systems.
• Chemical-process circulation.

Variable-speed operation can also help reduce the need to operate pumps continuously at full speed when process demand is lower.

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18. Application: Large Fans and Blowers

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

Typical applications include:

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

The PowerFlex 755 can adjust motor speed according to the required airflow.

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19. Application: Conveyors

The drive is well suited to large conveyors.

Conveyors can require high motor torque during startup, especially when heavily loaded.

Controlled acceleration can reduce mechanical stress on:

• Gearboxes.
• Couplings.
• Shafts.
• Conveyor belts.
• Rollers.
• Mechanical structures.

The drive can also be integrated into a larger control system where conveyor speed must be coordinated with upstream and downstream equipment.

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20. Application: Mining and Bulk Material Handling

Large material-handling systems are another strong application area.

Potential applications include:

• Ore conveyors.
• Aggregate conveyors.
• Transfer conveyors.
• Material feeders.
• Crushers.
• Bulk handling systems.
• Processing machinery.

These applications often require high starting torque and short-duration overload capability.

The actual drive sizing should be based on the mechanical load profile and motor current.

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21. Application: Compressors

Large industrial compressors can require several hundred kilowatts of motor power.

The PowerFlex 755 can provide variable-speed operation when the compressor design permits it.

Potential applications include:

• Industrial air compressors.
• Process compressors.
• Large refrigeration systems.
• Utility compressors.
• Process-gas systems.

Compressor applications should be checked carefully for permitted motor speed range, lubrication requirements, minimum speed and acceleration requirements.

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22. Application: Mixers and Agitators

Mixers can experience significant changes in torque as material characteristics change.

The drive’s high current capacity and high-power architecture make it appropriate for large mixing systems.

Typical applications include:

• Chemical processing.
• Cement processing.
• Mineral processing.
• Slurry handling.
• Food processing.
• Batch processing.

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23. Application: Process Machinery

The 20G1AJF265JN4NNNNN can also be applied to large process machines where stable motor speed is important.

Potential applications include:

• Extruders.
• Large rollers.
• Industrial processing lines.
• Production machinery.
• Large rotating equipment.
• Process fans.
• Material-processing systems.

Variable-speed control can be used to coordinate machine speed with process throughput.

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24. Application Selection Guidelines

Before selecting this drive, the following engineering factors should be reviewed.

Motor Rated Current

Motor current is the most important electrical sizing parameter.

The motor’s rated current should be compared with the appropriate drive duty rating.

Motor Voltage

The motor should be suitable for the 690 VAC electrical system.

Load Type

Determine whether the application is variable torque, constant torque, heavy duty or regenerative.

Starting Torque

High starting torque requirements should be evaluated carefully.

Acceleration Time

Large inertia can require significant acceleration time.

Operating Speed

The motor manufacturer’s permitted speed range should be respected.

Ambient Temperature

High temperatures can affect drive thermal performance.

Altitude

High-altitude installations may require additional thermal considerations.

Motor Cable Length

Long motor cables may require additional output-side considerations.

Harmonic Requirements

The complete electrical system should be evaluated for harmonic-current requirements.

Communication

EtherNet/IP architecture should be planned as part of the control system.

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25. Mechanical Installation Considerations

The 20G1AJF265JN4NNNNN is a large floor-mounted drive.

It should be installed in a location capable of supporting a heavy electrical cabinet.

A practical reference envelope is approximately:

2477 mm × 600 mm × 800 mm

for height, width and cabinet depth.

The equipment weight is approximately in the 600–650 kg class, depending on the final configuration and packaging.

The installation area should therefore be evaluated for:

• Floor loading.
• Transportation access.
• Lifting access.
• Front-door clearance.
• Cable-entry space.
• Ventilation.
• Maintenance access.
• Adjacent equipment clearance.
• Emergency access.

For final engineering, the exact dimensional drawing for the purchased configuration should be used.

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26. Maintenance

Regular maintenance is important for a high-power Frame 8 drive.

Cooling fans should be inspected.

Air passages should be kept clean.

The enclosure should be checked for contamination.

Power connections should be inspected according to the site’s maintenance schedule.

Technicians should monitor:

• Fan condition.
• Cabinet temperature.
• Fault history.
• Motor current.
• Output voltage.
• Communication status.
• Abnormal noise.
• Unusual vibration.
• Repeated overload events.
• Repeated drive trips.

Early identification of these conditions can help prevent unexpected production downtime.

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27. Local HIM Benefits

The JN4 configuration is particularly valuable when the drive is maintained locally.

A technician can access the drive directly from the front of the cabinet.

This can make:

• Startup.
• Commissioning.
• Parameter verification.
• Fault diagnosis.
• Motor testing.
• Troubleshooting.
• Preventive maintenance.

more convenient.

For large plants, this can be especially useful because the drive may be located some distance from the main control room.

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28. Five Closely Related PowerFlex 755 Models

The following models are suitable for comparison with the target 690 VAC PowerFlex 755 configuration.

Model	Voltage	Current Class	Light Duty	Normal Duty	Heavy Duty	Frame	Enclosure	Cooling
20G1AJF330JN4NNNNN	690 VAC	330 A	355 kW	315 kW	250 kW	8	IP54 / Type 12	Air-Cooled
20G1AJF370JN4NNNNN	690 VAC	370 A	400 kW	355 kW	300 kW	8	IP54 / Type 12	Air-Cooled
20G1AJF415JN4NNNNN	690 VAC	415 A	450 kW	400 kW	355 kW	8	IP54 / Type 12	Air-Cooled
20G1AJF460JN4NNNNN	690 VAC	460 A	500 kW	450 kW	400 kW	8	IP54 / Type 12	Air-Cooled
20G1AJF500JN4NNNNN	690 VAC	500 A class	550 kW class	500 kW class	450 kW class	8	IP54 / Type 12	Air-Cooled

These models provide a useful progression when a motor requirement exceeds the 265 A class.

The 20G1AJF330JN4NNNNN is the next practical step above the 265 A configuration.

The 20G1AJF370JN4NNNNN provides additional current capacity for larger motors.

The 20G1AJF415JN4NNNNN is appropriate for applications requiring still higher power.

The 20G1AJF460JN4NNNNN moves into the approximately 500 kW Light-Duty class.

The 20G1AJF500JN4NNNNN provides still greater capacity for very large 690 VAC motor systems.

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29. Same-Series Current Comparison

Model	Approx. Current	Light-Duty Power	Normal-Duty Power	Heavy-Duty Power	Typical Position
20G1AJF265JN4NNNNN	265 A	315 kW	250 kW	200 kW	Target model
20G1AJF330JN4NNNNN	330 A	355 kW	315 kW	250 kW	Higher capacity
20G1AJF370JN4NNNNN	370 A	400 kW	355 kW	300 kW	High capacity
20G1AJF415JN4NNNNN	415 A	450 kW	400 kW	355 kW	Very high capacity
20G1AJF460JN4NNNNN	460 A	500 kW	450 kW	400 kW	Very high capacity
20G1AJF500JN4NNNNN	500 A class	550 kW class	500 kW class	450 kW class	Extreme high-power range

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30. Mechanical Comparison of Related Models

Model	Approx. Height	Approx. Width	Approx. Depth	Weight Class	Frame
20G1AJF265JN4NNNNN	2477 mm class	600 mm class	800 mm class	600–650 kg class	8
20G1AJF330JN4NNNNN	2477 mm class	600 mm class	800 mm class	600–650 kg class	8
20G1AJF370JN4NNNNN	2477 mm class	600 mm class	800 mm class	600–650 kg class	8
20G1AJF415JN4NNNNN	2477 mm class	600 mm class	800 mm class	600–650 kg class	8
20G1AJF460JN4NNNNN	2477 mm class	600 mm class	800 mm class	600–650 kg class	8

These values represent the common Frame 8 MCC-style mechanical class rather than a substitute for the final configuration drawing.

For projects involving fixed cabinet layouts, lifting equipment or foundation calculations, the exact purchased configuration should be checked against its mechanical drawing.

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31. Five Other Popular Allen-Bradley Models

The following products provide useful comparisons across different PowerFlex families and application sizes.

Model	Series	Voltage Class	Current Class	Approx. Power Range	Typical Application	Size / Frame Class
25B-D030N114	PowerFlex 525	380…480 VAC	30 A class	Up to approximately 20 HP ND	Compact machines	Frame D
25C-D030N114	PowerFlex 527	380…480 VAC class	30 A class	Up to approximately 20 HP class	Machine automation	Compact
20F1AND302JA0NNNNN	PowerFlex 753	480 VAC class	302 A	Large industrial motor range	Process equipment	Frame 7
20G1AJE460JN4NNNNN	PowerFlex 755	600 VAC	460 A	500 HP LD / 500 HP ND / 400 HP HD	Large industrial motors	Frame 8
20G1AJF415JN4NNNNN	PowerFlex 755	690 VAC	415 A	450 kW LD / 400 kW ND / 355 kW HD	High-power industrial motors	Frame 8

These models cover very different application ranges.

The 25B-D030N114 is intended for compact machine-level applications and is dramatically smaller than the 20G1AJF265JN4NNNNN.

The 25C-D030N114 is another compact drive platform for machine automation.

The 20F1AND302JA0NNNNN is more appropriate for large industrial motor applications where a PowerFlex 753 platform is preferred.

The 20G1AJE460JN4NNNNN is a useful comparison because it belongs to the same PowerFlex 755 high-power class but operates at 600 VAC.

The 20G1AJF415JN4NNNNN is a close 690 VAC PowerFlex 755 comparison with greater output current capability.

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32. Application Comparison

Application	Suitability	Reason
Large centrifugal pump	Excellent	High-power variable-speed operation
Large cooling fan	Excellent	Strong variable-torque capability
Industrial blower	Excellent	High-power motor control
Large conveyor	Excellent	High current and controlled acceleration
Mining conveyor	Excellent	High-power industrial architecture
Bulk material handling	Excellent	Suitable for large motors
Large compressor	Good	High-power speed control
Large mixer	Excellent	High-torque process capability
Extruder	Good	Stable variable-speed control
Heavy process machinery	Excellent	Frame 8 high-power architecture
Small machine automation	Poor	Excessive size and capacity
Small pump	Poor	Better served by a smaller PowerFlex drive

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33. 20G1AJF265JN4NNNNN vs. 20G1AJF330JN4NNNNN

Parameter	20G1AJF265JN4NNNNN	20G1AJF330JN4NNNNN
Voltage	690 VAC	690 VAC
Current	265 A	330 A
Light Duty	315 kW	355 kW
Normal Duty	250 kW	315 kW
Heavy Duty	200 kW	250 kW
Frame	8	8
Enclosure	IP54 / Type 12	IP54 / Type 12
Cooling	Forced Air	Forced Air
EtherNet/IP	Yes	Yes
Local HIM	Enhanced	Enhanced
Main Difference	Lower current capacity	Higher current capacity

The 330 A model should be considered when the 265 A drive is insufficient for the motor’s actual current or overload requirements.

The 265 A model remains the better choice when the motor current comfortably fits within its applicable duty rating.

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34. 20G1AJF265JN4NNNNN vs. 600 VAC PowerFlex 755

The 20G1AJF265JN4NNNNN and 600 VAC PowerFlex 755 configurations belong to the same general PowerFlex 755 architecture, but their voltage classes are different.

The 690 VAC version is particularly useful for high-power motors designed for 690 VAC operation.

A 600 VAC model should not be treated as a direct electrical replacement simply because the current or horsepower rating appears similar.

The motor voltage, supply voltage, insulation system, protection equipment and complete electrical architecture must all be checked before substitution.

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35. Why Choose the JN4 Configuration

The JN4 configuration is attractive when local operation and maintenance are important.

A high-power drive may be installed in a remote electrical room where technicians need direct access to operating information.

The enhanced HIM provides an interface for:

• Parameter adjustment.
• Drive monitoring.
• Fault inspection.
• Startup.
• Commissioning.
• Maintenance.
• Troubleshooting.

This can make the JN4 version more practical than a no-HIM configuration in service-intensive installations.

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36. Benefits for Large Industrial Plants

For a large industrial plant, the 20G1AJF265JN4NNNNN offers several practical advantages.

It provides a standardized high-power drive platform.

The embedded EtherNet/IP interface supports networked automation.

The 690 VAC platform is suitable for large motor systems.

The Frame 8 enclosure provides a practical architecture for centralized electrical installations.

The IP54 / NEMA Type 12 enclosure offers improved protection in industrial electrical rooms.

The enhanced HIM improves local maintenance access.

The multiple duty ratings provide flexibility during motor-drive selection.

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37. Power System Considerations

Because this is a 690 VAC high-power drive, the complete power-distribution system must be designed accordingly.

The following should be evaluated:

• Incoming voltage.
• Short-circuit current.
• Upstream protective devices.
• Transformer capacity.
• Cable ampacity.
• Grounding.
• Motor cable construction.
• Motor insulation.
• Harmonics.
• Electromagnetic compatibility.
• Emergency shutdown arrangements.
• Safety architecture.
• Environmental conditions.

The drive should always be treated as one component of a complete electrical system.

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38. Motor Compatibility

The motor should be compatible with:

• 690 VAC operation.
• Variable-frequency drive operation.
• The required speed range.
• The expected acceleration profile.
• The required torque.
• The expected overload conditions.
• The motor-cable arrangement.

For large motors, insulation stress and reflected-wave effects should be considered, especially when long motor cables are used.

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39. Preventive Maintenance Recommendations

A suitable preventive-maintenance program should include periodic inspection of:

1. Cooling fans.
2. Airflow passages.
3. Cabinet cleanliness.
4. Power terminals.
5. Motor connections.
6. Grounding connections.
7. Network communication.
8. Fault history.
9. Operating temperature.
10. Motor current.
11. Unusual vibration.
12. Abnormal electrical noise.
13. Cabinet seals and enclosure condition.
14. Operator-interface operation.
15. Internal signs of overheating.

The maintenance interval should be adapted to the operating environment.

A clean electrical room generally imposes less contamination stress than a dusty material-handling environment.

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40. Overall Technical Assessment

The Allen-Bradley 20G1AJF265JN4NNNNN is a high-power PowerFlex 755 AC drive designed for large industrial motors.

Its defining specifications are the 690 VAC three-phase input, 265 A output class, approximately 315 kW Light-Duty rating, approximately 250 kW Normal-Duty rating, and approximately 200 kW Heavy-Duty rating.

The Frame 8 IP54 / NEMA Type 12 MCC-style enclosure provides the physical scale and environmental protection required for large industrial installations.

The forced-air cooling system is appropriate for the thermal demands of a high-power drive.

Embedded EtherNet/IP allows the drive to be incorporated into modern industrial automation networks.

The JN4 configuration adds a useful local operator interface, making the drive particularly practical for commissioning and maintenance.

The 20G1AJF265JN4NNNNN is especially well suited to large pumps, fans, blowers, conveyors, compressors, mixers, process machines and bulk-material handling systems.

For applications requiring substantially more than 265 A, the closely related 330 A, 370 A, 415 A, 460 A and higher-current 690 VAC PowerFlex 755 configurations provide a straightforward path to a larger drive within the same product family.

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41. Final Specification Summary

Parameter	Final Specification
Brand	Allen-Bradley
Product Series	PowerFlex 755
Model	20G1AJF265JN4NNNNN
Product Type	High-Power Air-Cooled AC Drive
Input Voltage	690 VAC
Input Phase	Three Phase
Input Frequency	50/60 Hz class
Output Current	265 A
Light-Duty Power	Approximately 315 kW
Normal-Duty Power	Approximately 250 kW
Heavy-Duty Power	Approximately 200 kW
Frame	8
Cooling	Forced Air
Enclosure	IP54 / NEMA Type 12
Cabinet Style	800 mm Deep MCC Style
Approx. Height	2477 mm class
Approx. Width	600 mm class
Approx. Depth	800 mm class
Approx. Filtered Depth	Up to approximately 898 mm
Approx. Weight	Approximately 600–650 kg class
Input Architecture	AC Input with Precharge
DC Terminals	None
Communication	Embedded EtherNet/IP
Filtering	Filtered
CM Jumper	Installed
Dynamic Braking	None
Local Interface	Enhanced LCD / Full-Numeric HIM
HIM Protection	IP66 / NEMA Type 4X/12 class
Installation	Floor-Mounted
Main Application	Large Industrial Motor Control

42. Final Recommendation

For a large industrial motor system operating at 690 VAC, the 20G1AJF265JN4NNNNN is a strong choice when the required motor current is within the 265 A class and the application benefits from an enclosed Frame 8 PowerFlex 755 architecture.

The model is particularly attractive when the project requires both networked automation and local maintenance access.

For applications with higher motor current requirements, the 330 A, 370 A, 415 A, 460 A and larger 690 VAC PowerFlex 755 configurations provide useful alternatives.

For applications with lower motor requirements, a smaller PowerFlex 755 configuration can reduce cabinet size, electrical capacity and installation cost.

The most important selection criteria remain the motor nameplate current, actual mechanical load, duty classification, acceleration requirements, motor voltage, operating environment and required control architecture.