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Allen-Bradley 20G1AJE355AN4NNNNN PowerFlex 755 AC Drive
1. Product Overview
The Allen-Bradley 20G1AJE355AN4NNNNN is a high-power air-cooled AC variable frequency drive belonging to the PowerFlex 755 family.
It is designed for demanding industrial motor-control applications where high output power, stable speed regulation, flexible motor-control functions, industrial networking, and reliable operation are required.
This model is part of the large-frame PowerFlex 755 AC drive range and is configured for 600 VAC three-phase power systems.
The drive provides a nominal 355 A normal-duty output rating, with power ratings extending to approximately 400 HP for light-duty applications, 350 HP for normal-duty applications, and 300 HP for heavy-duty applications.
The configuration includes an Enhanced LCD Full Numeric HIM, making the unit suitable for applications where local drive setup, monitoring, diagnostics, parameter adjustment, and operator interaction are important.
The model also uses an air-cooled construction, IP54 / NEMA Type 12 enclosure protection, an 800 mm deep MCC-style package, integrated filtering, and an AC input arrangement with precharge and no DC input terminals.
The product belongs to the Allen-Bradley brand and the PowerFlex 755 series.
The original AN4 configuration has been discontinued, with 20G1AJE355JN4NNNNN identified as the direct replacement configuration.
2. Basic Product Identification
| Parameter | Specification |
|---|---|
| Brand | Allen-Bradley |
| Product Family | PowerFlex |
| Series | PowerFlex 755 |
| Product Type | Air-Cooled AC Drive |
| Catalog Number | 20G1AJE355AN4NNNNN |
| Drive Type | AC Variable Frequency Drive |
| Application | Industrial Motor Control |
| Cooling Method | Forced-Air / Air Cooled |
| Input Supply | 600 VAC Class |
| Input Phase | 3 Phase |
| Nominal Output Current | 355 A |
| Light-Duty Rating | 400 HP |
| Normal-Duty Rating | 350 HP |
| Heavy-Duty Rating | 300 HP |
| Approximate Power Capacity | 260 kW class |
| Enclosure | NEMA Type 12 |
| Protection Rating | IP54 |
| Package Style | 800 mm Deep MCC Style |
| Frame | Frame 8 |
| Filtering | Filtered |
| CM Jumper | Removed |
| Dynamic Braking | None |
| Internal Braking Transistor | None |
| Input Configuration | AC Input with Precharge |
| DC Terminals | No DC Terminals |
| HIM | Enhanced LCD Full Numeric HIM |
| HIM Protection | IP66 / NEMA Type 4X/12 class |
| Communication | Integrated EtherNet/IP |
| Installation | Industrial Cabinet / MCC / Drive System |
| Product Status | Discontinued |
| Direct Replacement | 20G1AJE355JN4NNNNN |
| Approx. Dimensions | 2100–2500 × 600 × 800 mm |
| Approx. Weight | 600–650 kg |
3. Detailed Electrical Parameters
The 20G1AJE355AN4NNNNN is designed around a 600 VAC three-phase industrial power system.
Its nominal current rating is 355 A, which places the drive in the high-power industrial drive category rather than the small machine-drive category.
The drive can be applied to motors with different load characteristics by using the appropriate duty rating.
| Electrical Parameter | Specification |
|---|---|
| Catalog Number | 20G1AJE355AN4NNNNN |
| Rated Input Voltage | 600 VAC class |
| Input Phase | 3 Phase |
| Rated Output Current – Normal Duty | 355 A |
| Light-Duty Continuous Current | Approx. 395 A |
| Light-Duty 1-Minute Current | Approx. 435 A |
| Normal-Duty Continuous Current | 355 A |
| Normal-Duty 1-Minute Current | Approx. 391 A |
| Normal-Duty Short-Time Current | Approx. 533 A / 3 s |
| Heavy-Duty Continuous Current | Approx. 295 A |
| Heavy-Duty 1-Minute Current | Approx. 443 A |
| Heavy-Duty Short-Time Current | Approx. 533 A / 3 s |
| Light-Duty Motor Rating | 400 HP |
| Normal-Duty Motor Rating | 350 HP |
| Heavy-Duty Motor Rating | 300 HP |
| Approx. Metric Power Class | 260 kW |
| DC Bus Class | Approx. 810 VDC |
| Input Type | AC input with precharge |
| DC Input Terminals | Not provided |
| Cooling | Air cooled |
| Dynamic Braking | None |
| Internal Braking Transistor | None |
| Filtering | Integrated filtering configuration |
| CM Jumper | Removed |
The three duty classifications are particularly important when selecting this drive.
A motor that operates continuously at relatively stable load conditions may be evaluated using the normal-duty rating, while applications involving significant overload, acceleration torque, or demanding mechanical loads should be evaluated against the heavy-duty rating.
For applications where the motor operates primarily under lighter load conditions, the light-duty rating can provide a higher usable horsepower range.
4. PowerFlex 755 Series
The PowerFlex 755 series is intended for large and sophisticated industrial motor-control systems.
Compared with compact general-purpose drives, the PowerFlex 755 platform is more commonly associated with large motors, process equipment, conveyors, pumps, fans, compressors, material-handling systems, and other machinery requiring advanced control and system integration.
The 20G1AJE355AN4NNNNN represents a large-frame configuration within this family.
Its combination of a 600 VAC class input, 355 A nominal current, Frame 8 construction, industrial enclosure, and integrated network capability makes it suitable for large equipment where a compact low-power inverter would not provide sufficient capacity.
5. Meaning of the Main Configuration
The catalog number contains a considerable amount of configuration information.
The 20G1 prefix identifies the PowerFlex 755 drive family.
The AJE section corresponds to the 600 VAC class configuration within this product range.
The 355 portion identifies the drive current class.
The AN4 configuration is particularly important because it combines the electrical package with the selected operator-interface configuration.
The A configuration indicates the CM jumper arrangement is removed.
The N4 configuration provides the Enhanced LCD Full Numeric HIM arrangement.
This makes the model different from an equivalent N0 configuration, where the drive is supplied without the same full numeric HIM arrangement.
For system engineers, this distinction can be important when replacing an existing drive because the physical operator interface, cabinet door arrangement, commissioning procedure, and local maintenance method may all depend on the HIM configuration.
6. Enhanced LCD Full Numeric HIM
One of the most useful characteristics of the 20G1AJE355AN4NNNNN is its Enhanced LCD Full Numeric HIM.
A full numeric HIM is especially useful on large industrial drives because technicians can directly access parameters, operating values, alarms, fault information, status information, and commissioning functions from the drive interface.
The local interface reduces dependence on an external laptop for basic commissioning and troubleshooting.
For maintenance personnel, this can be particularly useful during:
- Motor commissioning
- Drive parameter verification
- Fault investigation
- Alarm diagnosis
- Motor speed adjustment
- Acceleration and deceleration setup
- Current monitoring
- Drive status inspection
- Basic troubleshooting
- Preventive maintenance
The HIM configuration also provides a practical interface for equipment that may not always have a nearby engineering workstation.
7. Enclosure and Mechanical Construction
The 20G1AJE355AN4NNNNN uses an industrial IP54 / NEMA Type 12 enclosure arrangement.
NEMA Type 12 protection is commonly associated with industrial indoor environments where the enclosure must provide protection against dust, dirt, and non-corrosive industrial contaminants.
The package is an 800 mm deep MCC-style configuration and uses a large Frame 8 mechanical arrangement.
Because of the high-power electrical section and air-cooling system, this is a substantially larger piece of equipment than compact PowerFlex drives.
For installation planning, the approximate dimensional envelope can be considered around:
2100–2500 mm high × 600 mm wide × 800 mm deep
with an approximate equipment weight in the range of:
600–650 kg
These dimensions and weight should be treated as engineering planning values rather than final installation dimensions. The exact shipping and installation dimensions can vary with packaging, configuration, cabinet arrangement, accessories, and installation hardware.
| Mechanical Parameter | Specification |
|---|---|
| Catalog Number | 20G1AJE355AN4NNNNN |
| Frame | Frame 8 |
| Cooling | Air Cooled |
| Enclosure | NEMA Type 12 |
| IP Rating | IP54 |
| Package Style | 800 mm Deep MCC Style |
| Approx. Height | 2100–2500 mm |
| Approx. Width | 600 mm |
| Approx. Depth | 800 mm |
| Approx. Weight | 600–650 kg |
| Installation Type | Industrial floor/cabinet/MCC installation |
| Maintenance Access | Front-oriented service access recommended |
| Ventilation | Forced-air cooling required |
| Mounting Consideration | Heavy-duty industrial mounting |
For a new installation, the mechanical drawing for the exact configuration should be used before fabrication of the cabinet, MCC section, mounting structure, lifting arrangement, or transportation frame.
8. Input Configuration
The drive uses an AC input with precharge.
The catalog configuration does not provide dedicated DC input terminals.
The precharge arrangement is useful for controlling the initial charging of the DC bus when the drive is energized.
This type of input configuration is typical of a packaged industrial AC drive intended to be connected directly to an appropriate three-phase AC supply.
The absence of DC terminals should be considered when designing a common DC bus system or when replacing another drive that uses a different DC-bus architecture.
For a direct replacement, the electrical architecture of the existing system should therefore be checked rather than assuming that every PowerFlex 755 configuration has identical input and DC-bus connections.
9. Filtering and CM Jumper Configuration
The 20G1AJE355AN4NNNNN is supplied in a filtered configuration.
The CM jumper is removed in this particular catalog configuration.
This is an important detail for system engineers because the grounding and common-mode behavior of a high-power variable frequency drive can affect motor-cable selection, EMC performance, bearing-current considerations, grounding arrangements, and system-level noise.
The drive should therefore be installed according to the applicable PowerFlex installation requirements, especially when using long motor cables or when the drive is connected to sensitive control or instrumentation systems.
| Configuration Item | 20G1AJE355AN4NNNNN |
|---|---|
| Catalog Number | 20G1AJE355AN4NNNNN |
| EMC Filtering | Filtered |
| CM Jumper | Removed |
| Dynamic Braking | None |
| Internal Braking Transistor | None |
| AC Precharge | Yes |
| DC Input Terminals | No |
| Cooling | Air Cooled |
| Enclosure | IP54 / NEMA Type 12 |
10. Communication and Control
The PowerFlex 755 platform supports integrated industrial communication functionality, including EtherNet/IP.
This is particularly valuable in modern automation systems where the drive is expected to exchange commands, speed references, status data, alarms, diagnostic information, and operating parameters with a programmable automation controller.
A networked drive architecture can reduce the amount of traditional hardwired control wiring required between the drive and the automation system.
Typical network-level information can include:
- Start and stop commands
- Speed reference
- Motor current
- Motor speed
- Drive status
- Fault status
- Warning information
- Operating frequency
- Output voltage
- Drive diagnostics
- Control enable status
- Process-related drive values
The exact communication architecture depends on the automation controller, network topology, software configuration, and drive parameterization.
11. Product Applications
The 20G1AJE355AN4NNNNN is suitable for large industrial machinery where variable-speed control is required.
Its 600 VAC class electrical configuration and 355 A current capacity make it particularly appropriate for high-power motors.
11.1 Pumps
Large centrifugal pumps, process pumps, water-treatment pumps, cooling-water pumps, and industrial circulation pumps can benefit from variable-speed operation.
Using a drive allows the motor speed to be adjusted according to process demand rather than simply operating continuously at full speed.
This can improve process control and, depending on the pump system, reduce unnecessary energy consumption.
The PowerFlex 755 architecture is well suited to large pumping systems where the motor power exceeds the practical range of smaller drives.
11.2 Fans and Blowers
Large ventilation fans, induced-draft fans, forced-draft fans, process blowers, and industrial exhaust systems can require substantial motor power.
Variable-frequency control allows airflow to be adjusted according to process requirements.
For large fan systems, the 355 A class provides considerably more capacity than compact machine drives.
11.3 Conveyors
Large belt conveyors and material-handling systems often require controlled acceleration and deceleration.
A high-power drive can provide controlled motor starting instead of applying full motor voltage directly to the motor.
This can reduce mechanical shock and provide better control over conveyor acceleration.
Typical applications include:
- Mining conveyors
- Bulk material conveyors
- Aggregate handling
- Cement material handling
- Port equipment
- Warehouse conveying systems
- Heavy industrial transfer systems
11.4 Crushers and Heavy Machinery
Heavy mechanical equipment can impose demanding starting and operating conditions on motors.
The PowerFlex 755 platform can be used in applications requiring controlled speed and torque.
For such equipment, the correct heavy-duty current rating must be considered carefully because the heavy-duty horsepower rating is lower than the light-duty rating.
11.5 Compressors
Industrial compressors may require precise speed control and reliable operation over long operating periods.
The drive can be integrated into a plant automation system so that compressor speed follows process demand.
For compressor applications, motor characteristics, starting torque, load profile, cooling requirements, and overload requirements should be reviewed during drive selection.
11.6 Water and Wastewater Systems
Large water and wastewater installations frequently use high-power motors for pumping, aeration, filtration, and circulation.
The 20G1AJE355AN4NNNNN can be considered for:
- Raw-water pumps
- Transfer pumps
- Wastewater pumps
- Aeration blowers
- Process-water circulation
- Cooling-water systems
- Large ventilation systems
11.7 Cement and Aggregate Equipment
Cement plants and aggregate-processing facilities contain numerous large motors.
Typical applications include:
- Large fans
- Conveyors
- Crushers
- Material feeders
- Pumps
- Blowers
- Processing machinery
The high current capability of the drive makes it suitable for large motor systems within this industrial sector.
11.8 Mining Equipment
Mining equipment often operates in harsh industrial environments and can involve large motors and high mechanical loads.
Applications can include conveyors, fans, pumps, crushers, and processing equipment.
The NEMA Type 12 / IP54 packaged construction provides a more industrialized enclosure arrangement than a basic open-frame drive.
12. Product Advantages
12.1 High Power Capacity
The most obvious advantage of the 20G1AJE355AN4NNNNN is its high current capacity.
With a nominal normal-duty rating of 355 A and a normal-duty motor rating around 350 HP, it is intended for substantially larger motors than compact general-purpose drives.
This makes it suitable for central plant equipment and large production machinery.
12.2 Flexible Duty Ratings
The drive can be evaluated for light-duty, normal-duty, and heavy-duty applications.
This is useful because industrial motors do not all have the same load profile.
A fan may operate under a relatively predictable load, while a conveyor or crusher may experience significant transient loading.
The multiple duty classifications provide a practical method for matching the drive to the actual mechanical application.
12.3 Integrated EtherNet/IP
Integrated EtherNet/IP capability simplifies integration into industrial automation architectures.
Instead of treating the drive as an isolated motor controller, it can become part of a larger control system.
This can improve access to drive status, alarms, commands, references, and diagnostic information.
12.4 Enhanced LCD Full Numeric HIM
The enhanced numeric operator interface is a significant advantage for maintenance personnel.
It provides local access to drive parameters and operating information.
This is especially useful in large industrial installations where a technician may need to diagnose a drive locally.
12.5 Industrial Enclosure
The IP54 / NEMA Type 12 configuration is suitable for industrial indoor environments where a higher level of enclosure protection is desirable.
This is especially useful in manufacturing plants, process plants, utility facilities, and heavy industrial installations.
12.6 Air-Cooled Construction
Forced-air cooling is a practical solution for a high-power drive.
Instead of requiring liquid cooling, the drive uses an air-based thermal-management system.
This simplifies the cooling infrastructure compared with liquid-cooled high-power equipment.
However, adequate cabinet ventilation and thermal management remain essential.
12.7 Integrated Filtering
The filtered configuration helps support electromagnetic compatibility within the overall drive installation.
This is particularly useful in industrial facilities containing PLCs, sensors, communication equipment, instrumentation, and other electrically sensitive equipment.
Correct grounding, cable routing, shielding, and installation practices remain essential.
12.8 Large-Frame Industrial Design
The Frame 8 architecture is designed for high-power industrial equipment.
It provides a substantial electrical and mechanical platform suitable for large motors and plant-level machinery.
This makes the product particularly relevant to applications where smaller drives cannot provide the required current capacity.
13. Typical Application Selection Guide
The following table provides a practical way to understand how the drive can be matched to different load types.
| Application Type | Typical Requirement | Suitability |
|---|---|---|
| Large Pump | Variable speed and high motor power | Excellent |
| Large Fan | High-power continuous operation | Excellent |
| Industrial Blower | Variable airflow | Excellent |
| Conveyor | High starting and operating torque | Very Good |
| Water Pumping | Process flow control | Excellent |
| Wastewater Equipment | Large motor control | Excellent |
| Cement Equipment | Heavy industrial motor control | Very Good |
| Mining Conveyor | High-power speed control | Very Good |
| Crusher | Heavy-duty torque requirement | Requires duty verification |
| Compressor | Variable-speed process control | Very Good |
| Material Handling | Controlled acceleration/deceleration | Excellent |
| Large Process Machine | PLC-integrated motor control | Excellent |
14. Installation Considerations
Because the 20G1AJE355AN4NNNNN is a large-frame high-power drive, installation planning is considerably more important than it is for a small cabinet-mounted inverter.
The installation location should provide sufficient clearance for cooling airflow, maintenance access, cable routing, and service operations.
The air-cooling system must have an appropriate environment.
Dust accumulation on cooling paths can reduce thermal performance over time, so preventive maintenance should include inspection and cleaning of cooling components.
The motor cable should be selected according to the drive output current, installation method, motor insulation system, cable length, grounding requirements, and applicable electrical codes.
The protective earth connection should be designed carefully.
For large drives, grounding is not merely a safety consideration; it is also important for EMC behavior and reliable communication performance.
15. Motor Compatibility Considerations
Before selecting the 20G1AJE355AN4NNNNN for a motor, the following information should be checked:
- Motor rated voltage
- Motor rated current
- Motor horsepower
- Motor frequency
- Motor speed
- Motor insulation system
- Motor overload requirement
- Starting torque requirement
- Continuous operating load
- Acceleration requirements
- Deceleration requirements
- Motor cable length
- Encoder requirements, if applicable
- Environmental conditions
The motor’s full-load current should not simply be compared with the drive’s maximum current without considering the duty classification.
A motor may have a horsepower rating that appears compatible with the drive but still require a different drive selection because of high starting torque or continuous overload conditions.
16. Maintenance Characteristics
The 20G1AJE355AN4NNNNN is intended for industrial service and should be incorporated into a preventive maintenance program.
Typical maintenance activities include:
- Cooling-air inspection
- Fan inspection
- Terminal inspection
- Cable inspection
- Grounding inspection
- Enclosure inspection
- Filter inspection
- Alarm history review
- Fault history review
- Drive temperature monitoring
- Motor current monitoring
- Communication health inspection
- Mechanical connection inspection
The enhanced HIM is useful during maintenance because technicians can inspect operating information directly at the drive.
For high-power equipment, preventive maintenance can be particularly important because unexpected downtime can affect an entire production line or process section.
17. Important Product Status Information
The catalog configuration 20G1AJE355AN4NNNNN is a discontinued PowerFlex 755 configuration.
The discontinuation date was June 30, 2024.
The listed direct replacement configuration is 20G1AJE355JN4NNNNN.
For an existing installation, the original AN4 model may still be relevant for repair, replacement, spare-parts management, or maintaining an installed base.
For a new project, however, the replacement configuration should normally be evaluated first.
The replacement should not be selected purely by catalog-number similarity. The electrical rating, HIM arrangement, enclosure, CM-jumper configuration, network requirements, motor rating, mechanical dimensions, and installation requirements should all be checked.
18. Main Technical Specification Summary
| Parameter | Specification |
|---|---|
| Model | 20G1AJE355AN4NNNNN |
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Product Type | Air-Cooled AC Drive |
| Input Voltage | 600 VAC class |
| Input Phase | 3 Phase |
| Output Current | 355 A Normal Duty |
| Light-Duty Current | Approx. 395 A continuous |
| Normal-Duty Current | 355 A continuous |
| Heavy-Duty Current | Approx. 295 A continuous |
| Light-Duty Power | 400 HP |
| Normal-Duty Power | 350 HP |
| Heavy-Duty Power | 300 HP |
| Approx. Metric Power | 260 kW |
| Frame | 8 |
| Enclosure | NEMA Type 12 |
| IP Rating | IP54 |
| Package | 800 mm Deep MCC Style |
| Cooling | Air Cooled |
| Input | AC with Precharge |
| DC Terminals | None |
| Filtering | Filtered |
| CM Jumper | Removed |
| Dynamic Braking | None |
| Internal Brake Transistor | None |
| Network | EtherNet/IP |
| Operator Interface | Enhanced LCD Full Numeric HIM |
| HIM Protection | IP66 / NEMA Type 4X/12 class |
| Approx. Dimensions | 2100–2500 × 600 × 800 mm |
| Approx. Weight | 600–650 kg |
| Status | Discontinued |
| Direct Replacement | 20G1AJE355JN4NNNNN |
19. Five Recommended Related PowerFlex 755 Models
The following models are closely related to the 20G1AJE355AN4NNNNN and are useful when comparing different current ratings or operator-interface configurations.
| Recommended Model | Series | Voltage Class | Current Class | LD / ND / HD Power | HIM | CM Jumper |
|---|---|---|---|---|---|---|
| 20G1AJE295AN4NNNNN | PowerFlex 755 | 600 VAC | 295 A | 350 / 300 / 250 HP | Enhanced LCD Full Numeric | Removed |
| 20G1AJE355AN0NNNNN | PowerFlex 755 | 600 VAC | 355 A | 400 / 350 / 300 HP | No HIM | Removed |
| 20G1AJE395AN4NNNNN | PowerFlex 755 | 600 VAC | 395 A class | Higher-power 600 V class | Enhanced LCD Full Numeric | Removed |
| 20G1AJE435AN4NNNNN | PowerFlex 755 | 600 VAC | 435 A class | Higher-power 600 V class | Enhanced LCD Full Numeric | Removed |
| 20G1AJE460AN4NNNNN | PowerFlex 755 | 600 VAC | 460 A class | Higher-power 600 V class | Enhanced LCD Full Numeric | Removed |
These models are useful when the motor load falls below or above the 355 A class.
The 20G1AJE295AN4NNNNN is a logical lower-current alternative.
The 20G1AJE355AN0NNNNN is electrically close to the subject model but changes the operator-interface configuration.
The higher-current 395 A, 435 A, and 460 A configurations can be considered when the motor or mechanical load requires additional current capacity.
20. Additional Closely Related Configurations
For an existing PowerFlex 755 installation, it can also be useful to compare different suffix configurations of the same current rating.
| Model | Voltage Class | Current | HIM Configuration | CM Jumper | General Purpose |
|---|---|---|---|---|---|
| 20G1AJE355AN0NNNNN | 600 VAC | 355 A | No HIM | Removed | Basic packaged configuration |
| 20G1AJE355AN4NNNNN | 600 VAC | 355 A | Enhanced LCD Full Numeric | Removed | Local operator interface |
| 20G1AJE355JN0NNNNN | 600 VAC | 355 A | No HIM | Installed | Alternative CM configuration |
| 20G1AJE355JN4NNNNN | 600 VAC | 355 A | Enhanced LCD Full Numeric | Installed | Replacement-oriented configuration |
The differences between these models are important during replacement work.
The current rating alone does not fully define the product.
The HIM configuration and CM-jumper configuration can affect installation, commissioning, grounding, EMC behavior, and the physical operator interface.
21. Five Popular Allen-Bradley Models for Comparison
The following five models are useful Allen-Bradley drive products to consider when comparing different motor-power ranges and application requirements.
| Popular Model | Product Family | Typical Voltage Class | Approx. Application Range | Product Type | Typical Application |
|---|---|---|---|---|---|
| 25B-D030N114 | PowerFlex 525 | 480 VAC class | Around 30 HP class | Compact AC Drive | Machines, pumps, conveyors |
| 25C-D030N114 | PowerFlex 527 | 480 VAC class | Around 30 HP class | AC Drive | Machine automation |
| 20G1AGC260JN0NNNNN | PowerFlex 755 | 480 VAC class | Large motor applications | Air-Cooled AC Drive | Pumps, fans, conveyors |
| 20G1AGC302JA0NNNNN | PowerFlex 755 | 480 VAC class | Large motor applications | Air-Cooled AC Drive | Heavy industrial machinery |
| 20G1AGE053JA0NNNNN | PowerFlex 755 | 600 VAC class | Medium/high-power applications | Air-Cooled AC Drive | Industrial process equipment |
These models span different power ranges and configuration philosophies.
The PowerFlex 525 and PowerFlex 527 models are considerably smaller and are more appropriate for compact machinery and lower-power applications.
The PowerFlex 755 configurations are intended for more demanding industrial systems where higher motor power, sophisticated control, and system-level integration are required.
22. Comparison with Smaller Drives
The 20G1AJE355AN4NNNNN should not be considered simply as a larger version of a small machine drive.
Its physical size, power rating, cooling requirements, enclosure, installation requirements, and system integration capabilities place it in a different industrial application category.
A smaller drive may be preferable for a 5 HP, 10 HP, 20 HP, or 30 HP motor because it can reduce cabinet space, installation cost, and power-system requirements.
The 20G1AJE355AN4NNNNN becomes attractive when the motor reaches a much higher power range and the application requires a robust industrial drive platform.
23. Why the 20G1AJE355AN4NNNNN Is Valuable for Large Industrial Systems
The key value of this model is the combination of high power capacity and industrial control capability.
It is not merely a frequency converter.
In a properly engineered system, it can become an important part of the motor-control and automation architecture.
The drive can manage motor speed while simultaneously providing operational information to the plant control system.
This makes it particularly suitable for applications where the motor is an important part of the production process.
For example, a large process pump may need to maintain pressure, a conveyor may need controlled acceleration, a blower may need to maintain airflow, or a process machine may need a stable motor speed.
In each case, variable-speed control can be integrated into the larger automation system.
24. Key Advantages at a Glance
| Advantage | Description |
|---|---|
| High Current Capacity | 355 A normal-duty class |
| High Power Rating | Up to approximately 350 HP normal duty |
| 600 VAC Class | Suitable for high-voltage industrial motor systems |
| PowerFlex 755 Platform | Designed for advanced industrial applications |
| EtherNet/IP | Supports integration into automation networks |
| Enhanced LCD HIM | Convenient local setup and diagnostics |
| IP54 / NEMA Type 12 | Industrial enclosure protection |
| Frame 8 | Large-frame high-power construction |
| Air Cooling | Practical thermal-management method |
| Integrated Filtering | Supports EMC-oriented system design |
| Flexible Duty Ratings | LD / ND / HD selection capability |
| AC Precharge | Controlled DC-bus charging architecture |
| Large Motor Applications | Suitable for pumps, fans, conveyors and process machinery |
| Local Maintenance | HIM simplifies field diagnostics |
| Industrial Automation | Suitable for PLC-based control architectures |
25. Recommended Use Cases
For a new industrial project, this drive is particularly worth considering when the following conditions apply:
- The motor operates from a 600 VAC class three-phase system.
- The motor current approaches the 355 A normal-duty range.
- The application requires variable-speed control.
- The system uses a PLC or industrial automation network.
- Local drive diagnostics are desirable.
- The installation requires NEMA Type 12 / IP54 class protection.
- The motor is part of a large pump, fan, conveyor, blower, compressor, or process machine.
- The system requires a large-frame industrial drive.
- The application benefits from EtherNet/IP communication.
- The equipment requires local operator access through an enhanced numeric HIM.
26. Engineering Selection Notes
When replacing an existing 20G1AJE355AN4NNNNN, engineers should not compare only the horsepower rating.
The following parameters should be checked together:
Voltage → Current → Duty → Enclosure → Frame → HIM → CM Jumper → Braking → Communication → Mechanical Dimensions → Cooling → Motor Requirements
This is especially important for large-frame drives.
A replacement model with the same horsepower rating but a different current rating, enclosure, HIM, braking arrangement, or CM-jumper configuration may not be a true drop-in replacement.
The direct replacement 20G1AJE355JN4NNNNN should therefore be evaluated against the existing installation requirements before procurement.
27. Overall Product Assessment
The Allen-Bradley 20G1AJE355AN4NNNNN is a high-power PowerFlex 755 air-cooled AC drive designed for large industrial motor applications.
Its principal electrical characteristics are the 600 VAC class three-phase input, 355 A normal-duty current rating, and approximately 350 HP normal-duty capability.
Its Frame 8, IP54 / NEMA Type 12, 800 mm deep MCC-style construction makes it appropriate for large industrial electrical installations rather than compact machine cabinets.
The enhanced LCD full numeric HIM is a useful feature for commissioning and maintenance, particularly in plants where technicians need direct access to drive parameters and diagnostic information.
The integrated EtherNet/IP capability makes the drive suitable for PLC-based automation architectures and centralized plant control systems.
The filtered configuration and removed CM jumper provide a defined electrical configuration that should be considered during grounding and EMC design.
The product is particularly well suited to large pumps, fans, blowers, conveyors, compressors, water-treatment equipment, material-handling machinery, mining equipment, cement equipment, and other large process machines.
For an existing installation, the model remains relevant as an installed-base reference and replacement-identification number.
For new equipment, the listed direct replacement 20G1AJE355JN4NNNNN should be evaluated first, with special attention to the differences in configuration and installation requirements.
28. Final Technical Summary
| Category | 20G1AJE355AN4NNNNN |
|---|---|
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Product | Air-Cooled AC Drive |
| Main Voltage | 600 VAC class |
| Phase | 3 Phase |
| Normal-Duty Current | 355 A |
| Light-Duty Rating | 400 HP |
| Normal-Duty Rating | 350 HP |
| Heavy-Duty Rating | 300 HP |
| Approx. Power | 260 kW class |
| Frame | Frame 8 |
| Enclosure | NEMA Type 12 |
| Protection | IP54 |
| Package | 800 mm Deep MCC Style |
| Cooling | Air Cooled |
| Input | AC with Precharge |
| DC Terminals | None |
| Filtering | Filtered |
| CM Jumper | Removed |
| Dynamic Braking | None |
| Internal Brake Transistor | None |
| Communication | EtherNet/IP |
| HIM | Enhanced LCD Full Numeric |
| HIM Protection | IP66 / NEMA Type 4X/12 class |
| Approx. Dimensions | 2100–2500 × 600 × 800 mm |
| Approx. Weight | 600–650 kg |
| Application Level | Large Industrial Motor Control |
| Lifecycle | Discontinued |
| Direct Replacement | 20G1AJE355JN4NNNNN |
In practical terms, the 20G1AJE355AN4NNNNN is a large-frame, high-power PowerFlex 755 drive intended for demanding industrial motor-control applications. Its combination of 600 VAC class operation, 355 A normal-duty capacity, 350 HP normal-duty rating, industrial enclosure, enhanced local operator interface, filtering, and network integration makes it particularly appropriate for large-scale pumps, fans, conveyors, blowers, compressors, water systems, material-handling systems, and process machinery.