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Allen-Bradley 20G1AJC460AN0NNNNN PowerFlex 755 AC Drive
1. Product Introduction
The Allen-Bradley 20G1AJC460AN0NNNNN is a high-capacity industrial AC variable frequency drive belonging to the PowerFlex 755 series.
It is designed for large three-phase AC motor applications and is rated for the 380–400 VAC class, with a continuous output-current rating of 460 A.
The drive provides a 250 kW Normal Duty rating and a 200 kW Heavy Duty rating, making it suitable for large industrial machinery, process equipment, pumps, fans, conveyors, blowers and other high-power motor-driven systems.
This configuration uses a large Frame 8 power structure and an IP54 / NEMA Type 12, 800 mm deep MCC-style enclosure.
The model uses forced-air cooling, an AC input with precharge, no DC terminals, EMC filtering, and a configuration with the common-mode capacitor jumper removed.
The AN0 configuration does not include an internal dynamic-braking transistor**. This is an important distinction when comparing it with JA0 configurations in the same PowerFlex 755 family.
The drive is also associated with embedded EtherNet/IP functionality, making it suitable for integration into a larger industrial automation system.
The 20G1AJC460AN0NNNNN is therefore best viewed as a large-frame, high-current PowerFlex 755 configuration intended for serious industrial motor-control applications rather than small or general-purpose machinery.
2. Brand and Product Series
| Item | Specification |
|---|---|
| Brand | Allen-Bradley |
| Product Family | PowerFlex |
| Product Series | PowerFlex 755 |
| Product Type | Industrial AC Variable Frequency Drive |
| Catalog Number | 20G1AJC460AN0NNNNN |
| Configuration | PowerFlex 755 AC Packaged Drive |
| Voltage Class | 380–400 VAC |
| Input Phase | 3-Phase |
| Rated Output Current | 460 A |
| Normal Duty Rating | 250 kW |
| Heavy Duty Rating | 200 kW |
| Light Duty Rating | 315 kW class |
| Frame Size | Frame 8 |
| Cooling | Forced Air |
| Enclosure | Type 12 / IP54 |
| Cabinet Style | 800 mm Deep MCC Style |
| Input Type | AC Input with Precharge |
| DC Terminals | None |
| Filtering | EMC Filter |
| CM Capacitor Configuration | Jumper Removed |
| Dynamic Braking | None |
| HIM | Configuration-dependent / No local HIM in the basic catalog configuration |
| Network | Embedded EtherNet/IP |
| Typical Use | Large industrial AC motor control |
The published selection information places the 20G1AJC460AN0NNNNN at 460 A, 250 kW Normal Duty and 200 kW Heavy Duty, using Frame 8 construction.
3. Main Technical Parameters
| Parameter | Specification |
|---|---|
| Model / Catalog Number | 20G1AJC460AN0NNNNN |
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Drive Type | AC Variable Frequency Drive |
| Drive Style | Packaged Drive |
| Input Voltage | 380–400 VAC |
| Input Phase | 3-Phase |
| Rated Output Current | 460 A |
| Light Duty Rating | 315 kW |
| Normal Duty Rating | 250 kW |
| Heavy Duty Rating | 200 kW |
| Frame | Frame 8 |
| Cooling | Forced Air |
| Enclosure | Type 12 / IP54 |
| Cabinet Style | 800 mm Deep MCC Style |
| Input Configuration | AC Input with Precharge |
| DC Terminals | None |
| Filtering | EMC Filter |
| CM Capacitor Jumper | Removed |
| Dynamic Braking | None |
| Communication | Embedded EtherNet/IP |
| Typical Motor Class | 200–250 kW |
| Approx. Width | 600 mm class |
| Approx. Height | 2,000–2,200 mm class |
| Approx. Depth | 800 mm class |
| Approx. Weight | 500–700 kg class |
| Installation | Floor-mounted / MCC-style industrial installation |
| Cooling Requirement | Forced-air ventilation |
| Application Category | High-power industrial motor control |
The model is specifically associated with an 800 mm deep MCC-style enclosure, which is substantially larger than the smaller PowerFlex 755 Frame 6 and Frame 7 configurations.
Important mechanical note: the width, height and weight values above are engineering planning ranges rather than certified shipping or installation dimensions. For a Frame 8 MCC-style drive, the actual cabinet arrangement, options, power-entry configuration and shipping assembly can affect the final mechanical envelope and mass. The final mechanical drawing should therefore be used for cabinet design, foundation design, lifting calculations and transportation planning.
4. Product Position Within the PowerFlex 755 Family
The 20G1AJC460AN0NNNNN belongs to the high-power section of the PowerFlex 755 product range.
The PowerFlex 755 family covers a broad range of industrial drive ratings, and Frame 8 configurations are intended for substantially larger motors than the smaller-frame versions.
The 460 A configuration represents a major step above the 200–300 A class drives.
This makes it appropriate where a conventional compact cabinet-mounted VFD would not provide sufficient motor current capacity.
The Frame 8 architecture also introduces a different installation approach.
Instead of treating the drive as a relatively small component mounted inside a machine cabinet, the equipment is more appropriately considered as a major electrical assembly that must be integrated into the plant’s motor-control infrastructure.
5. Voltage Class — 380–400 VAC
The 20G1AJC460AN0NNNNN is designed for a 380–400 VAC three-phase input system.
This voltage range is commonly encountered in industrial facilities using 400 VAC-class motor distribution.
The higher-power rating makes this model suitable for large motors where the plant distribution system is designed around 400 VAC.
The voltage class is an essential part of drive selection.
A 460 A drive designed for 380–400 VAC should not be assumed to be interchangeable with a 460 A drive designed for 480 VAC or 690 VAC.
The power semiconductor configuration, motor-current relationship, protection characteristics and rated output power are all affected by the voltage class.
6. 460 A Output Rating
The 460 A continuous output-current rating is one of the defining characteristics of this model.
At this current level, the drive is intended for large industrial motors.
Current is particularly important when selecting a VFD because motor horsepower alone does not completely describe the electrical requirements.
Motor current can vary because of:
- Motor efficiency
- Power factor
- Motor voltage
- Motor design
- Service factor
- Operating temperature
- Load characteristics
For this reason, a 250 kW motor should not automatically be matched to any 250 kW-rated drive.
The motor nameplate current and actual application duty should always be checked.
7. 250 kW Normal Duty Rating
The 250 kW Normal Duty rating places the drive firmly in the large industrial-drive category.
Normal Duty operation is suitable for applications where the motor operates primarily within its continuous rating and does not repeatedly experience the more severe overload conditions associated with Heavy Duty operation.
Typical applications include:
- Large centrifugal pumps
- Large industrial fans
- Blowers
- Cooling equipment
- Continuous conveyors
- Water-treatment equipment
- Process pumps
- Large ventilation systems
For these applications, the drive can provide adjustable speed, controlled acceleration and process-based speed control.
8. 200 kW Heavy Duty Rating
The 200 kW Heavy Duty rating is intended for applications with more demanding overload and torque characteristics.
Heavy Duty applications can involve:
- High starting torque
- High inertia
- Frequent acceleration
- Frequent deceleration
- Variable mechanical loads
- Large transient torque requirements
Typical examples include:
- Heavy conveyors
- Mixers
- Crushers
- Material-handling equipment
- Extrusion machinery
- Process machinery
- Large rotating equipment
The difference between 250 kW ND and 200 kW HD should be taken seriously when selecting the drive.
A machine that appears to be a 250 kW application based only on the motor nameplate may require a larger drive if its operating cycle is demanding.
9. Light Duty Capability
The selection data also identifies a 315 kW Light Duty class for this 460 A configuration.
Light Duty applications generally permit a less demanding overload profile.
This provides additional flexibility when the motor load is relatively stable and the application does not require the higher torque and overload performance associated with Normal Duty or Heavy Duty operation.
The appropriate rating should always be selected according to the actual machine duty rather than simply choosing the highest available horsepower or kilowatt number.
10. Duty Rating Comparison
| Operating Class | Approximate Power Rating | Typical Application |
|---|---|---|
| Light Duty | 315 kW | Relatively stable loads |
| Normal Duty | 250 kW | General industrial continuous loads |
| Heavy Duty | 200 kW | High-torque / demanding loads |
The three ratings provide flexibility, but they should not be treated as three independent motor capacities that can be selected without considering overload duration and load profile.
For engineering purposes, the actual motor current, torque and duty cycle should determine the correct operating class.
11. Frame 8 Construction
The drive uses Frame 8 construction.
Frame 8 is designed for very high-power applications and is considerably larger than the lower-frame PowerFlex 755 units.
The larger frame affects:
- Cabinet size
- Power wiring
- Cooling
- Mechanical support
- Service access
- Lifting requirements
- Cable routing
- Installation procedures
For Frame 8 equipment, the physical installation should be planned at the beginning of the project rather than treated as a final cabinet-detail issue.
The power wiring and cabinet mounting arrangement may require specialized handling equipment during installation.
12. 800 mm Deep MCC-Style Enclosure
One of the most distinctive characteristics of the 20G1AJC460AN0NNNNN is its 800 mm deep MCC-style enclosure.
This is a substantial industrial enclosure configuration.
The deeper enclosure provides space for:
- High-current power connections
- Large conductors
- Cooling airflow
- Internal electrical components
- Power-conversion hardware
- Service access
The physical arrangement is therefore much closer to an industrial motor-control-center installation than to a small standalone VFD.
For plant designers, this means that floor space, access corridors and cable-entry arrangements should be considered early.
13. Type 12 / IP54 Protection
The drive uses a Type 12 / IP54 enclosure.
This provides a significantly more protected installation than an open-frame drive.
It is appropriate for many industrial environments where equipment may be exposed to:
- Dust
- Dirt
- Airborne contaminants
- Industrial process debris
- Incidental moisture
However, the enclosure should not be interpreted as protection against every environmental condition.
Special consideration may still be required for:
- Corrosive gases
- Condensation
- High humidity
- Conductive contamination
- Extreme ambient temperatures
- Chemical exposure
- Heavy vibration
The environmental conditions should be evaluated before final installation.
14. Forced-Air Cooling
A drive of this size generates substantial heat.
The 20G1AJC460AN0NNNNN uses forced-air cooling to transfer heat away from the power-conversion section.
The cooling system is important because the drive contains high-power semiconductor components operating at substantial current levels.
Potential thermal-loss sources include:
- Semiconductor conduction losses
- Switching losses
- DC-bus losses
- Auxiliary power losses
- Internal control electronics
The installation must therefore maintain sufficient airflow.
15. Cooling and Ventilation Requirements
For reliable operation, the installation should provide:
- Adequate ventilation
- Correct airflow direction
- Clean air passages
- Proper fan operation
- Sufficient cabinet clearance
- Acceptable ambient temperature
The drive should not be installed in an enclosure where the internal temperature can exceed the allowable operating conditions.
For a large Frame 8 drive, cabinet heat calculations are particularly important.
The thermal load generated by the drive can be significant enough to influence the design of the entire electrical room.
16. AC Input with Precharge
The model uses AC input with precharge and no DC terminals.
The precharge system controls the initial charging of the DC bus when the drive is energized.
This prevents an uncontrolled initial capacitor-charging event and forms an important part of the drive’s power-input architecture.
The absence of external DC terminals should also be considered when comparing this model with other configurations that may support different DC-bus arrangements.
17. EMC Filtering
The 20G1AJC460AN0NNNNN is configured with EMC filtering.
This is useful in industrial environments where electromagnetic compatibility is an important design consideration.
Large VFDs can generate high-frequency electrical noise because of their switching operation.
Correct EMC performance depends on the complete installation, including:
- Grounding
- Motor cable construction
- Shielding
- Cable routing
- Control-cable separation
- Cabinet design
- Filter configuration
The drive’s EMC filter should therefore be considered as part of a complete electrical-noise-control strategy.
18. Common-Mode Capacitor Configuration
The catalog configuration uses the A configuration for the filtering and common-mode capacitor arrangement.
This corresponds to the common-mode capacitor jumper being removed.
This setting is important because it affects the relationship between the drive and the plant grounding system.
The configuration should be maintained according to the electrical-system design.
Changing common-mode capacitor arrangements without evaluating the grounding architecture can affect leakage current, common-mode noise and EMC performance.
19. Dynamic Braking
The 20G1AJC460AN0NNNNN is specified with no dynamic-braking transistor.
This is an important difference compared with PowerFlex 755 catalog numbers using a JA0 configuration.
For applications where the motor must rapidly decelerate a high-inertia load, the absence of an internal braking transistor must be considered during the initial drive selection.
Applications with substantial regenerative energy may require another braking or regenerative-energy-management architecture.
The drive should therefore not be selected solely by motor horsepower when braking requirements are significant.
20. Why the Absence of Dynamic Braking Matters
A high-power motor can return substantial energy to the drive DC bus during deceleration.
This becomes especially important with:
- Large fans
- Centrifuges
- High-inertia conveyors
- Large rotating machinery
- Rapid-stop applications
If the application requires rapid deceleration, the engineering team should determine how regenerated energy will be handled.
Possible approaches depend on the system architecture and may include:
- Longer deceleration time
- External braking arrangements where supported
- Regenerative systems
- Mechanical braking
- Alternative drive configurations
The correct approach depends on the actual machine.
21. Product Applications
Large Pumps
Large industrial pumps are one of the most common application categories for a drive of this power level.
Typical applications include:
- Water circulation
- Process-water pumping
- Cooling-water systems
- Industrial transfer pumps
- Water treatment
- Utility pumping
- Process-fluid handling
Variable-speed operation allows the motor speed to follow process requirements rather than operating continuously at a fixed speed.
22. Large Industrial Fans
Large fans can consume substantial motor power and may have significant inertia.
The drive can provide:
- Adjustable speed
- Controlled starting
- Controlled acceleration
- Process-based speed control
- Remote monitoring
Applications include:
- Furnace ventilation
- Industrial exhaust
- Cooling systems
- Process ventilation
- Dust collection
- Large air-handling systems
23. Large Blowers
Blowers are another suitable application.
Large process blowers may require continuous operation with variable airflow.
The drive can allow the blower speed to be adjusted according to:
- Air demand
- Process pressure
- Temperature
- Production rate
- Ventilation requirements
Potential applications include:
- Combustion air
- Pneumatic conveying
- Dust collection
- Process air
- Industrial ventilation
24. Conveyor Systems
Large conveyors can require substantial motor power.
A VFD allows the conveyor to start smoothly instead of applying full motor torque instantaneously.
Benefits can include:
- Reduced belt shock
- Reduced gearbox stress
- Controlled acceleration
- Adjustable speed
- Controlled stopping
For high-inertia conveyor systems, the absence of an internal braking transistor should be considered carefully if rapid stopping is required.
25. Material Handling
The 20G1AJC460AN0NNNNN can be applied to large material-handling machinery.
Potential equipment includes:
- Bulk-material conveyors
- Feeders
- Transfer systems
- Processing machinery
- Material transport equipment
The high current rating makes it suitable for large motors used in demanding material-handling systems.
26. Mining and Mineral Processing
Large mining and mineral-processing installations frequently use high-power motors.
Potential applications include:
- Conveyors
- Fans
- Pumps
- Crushers
- Feeders
- Material-processing equipment
The 250 kW Normal Duty rating gives this model a useful position for medium-to-large industrial motor systems within such facilities.
27. Cement and Aggregate Plants
Cement and aggregate facilities often operate continuously and use large motors.
Potential applications include:
- Process fans
- Conveyors
- Pumps
- Feeders
- Material-handling systems
- Processing equipment
The PowerFlex 755 platform provides a practical control architecture for integrating these drives into a plant automation network.
28. Process Machinery
The drive is also suitable for large process machines.
Examples include:
- Mixers
- Agitators
- Large process machines
- Material-processing equipment
- Extrusion-related machinery
- Industrial rotating equipment
The exact suitability depends on motor current, torque requirements and overload profile.
29. Steel and Metal Processing
High-power variable-frequency drives can be used in large industrial metal-processing systems.
Potential applications include:
- Fans
- Pumps
- Conveyors
- Cooling systems
- Material handling
- Process machinery
The 400 VAC class is particularly relevant to industrial plants built around 380–400 VAC distribution.
30. Main Product Advantages
High Current Capacity
The 460 A output rating gives the drive substantial motor-control capacity.
This makes it suitable for large industrial motors that would be beyond the range of smaller PowerFlex 755 frame sizes.
250 kW Normal Duty Rating
The 250 kW ND rating provides strong capacity for continuous industrial applications.
200 kW Heavy Duty Rating
The 200 kW HD rating allows the drive to address more demanding torque and overload applications.
315 kW Light Duty Capability
The higher Light Duty rating can be useful where the load profile is relatively stable.
Frame 8 Architecture
Frame 8 provides the physical and electrical structure required for high-current applications.
Type 12 / IP54 Protection
The packaged enclosure provides environmental protection suitable for many industrial installations.
800 mm Deep MCC-Style Construction
The large enclosure provides the space necessary for high-current power equipment and industrial cable arrangements.
EMC Filtering
The EMC-filtered configuration is useful in installations where electrical-noise control is important.
Embedded EtherNet/IP
The network interface supports integration with industrial control systems.
PowerFlex 755 Platform
The platform provides a wide range of drive sizes and configurations, making it easier to standardize motor-control equipment across a large plant.
31. Mechanical Dimensions
The 20G1AJC460AN0NNNNN is a Frame 8, 800 mm deep MCC-style configuration.
For preliminary planning, a reasonable engineering envelope is:
| Mechanical Parameter | Approximate Engineering Value |
|---|---|
| Frame | Frame 8 |
| Width | Approx. 600 mm class |
| Height | Approx. 2,000–2,200 mm |
| Depth | Approx. 800 mm |
| Approximate Weight | 500–700 kg |
| Enclosure | Type 12 / IP54 |
| Cabinet Style | MCC-style |
| Cooling | Forced Air |
| Installation | Floor-mounted industrial equipment |
The 800 mm depth is associated with the MCC-style enclosure specification for this model family.
The width, height and weight values above should be treated as preliminary planning figures.
For final design work, the exact mechanical drawing and the actual configuration of power wiring, options and enclosure sections should be used.
For transportation, lifting and foundation calculations, the actual shipping weight should always take precedence over an estimated equipment weight.
32. Installation Requirements
A Frame 8, 460 A drive requires substantially more installation planning than a compact VFD.
Important considerations include:
Floor Space
The MCC-style cabinet requires dedicated floor space.
Cable Routing
High-current motor and input conductors can be physically large.
Cable-entry and bending-radius requirements should therefore be considered during cabinet layout.
Ventilation
The cooling airflow must remain unobstructed.
Service Access
Technicians need sufficient access for:
- Power connections
- Control wiring
- Cooling components
- Internal service
- Inspection
Lifting
The equipment weight can be substantial.
The plant should have an appropriate handling plan before installation.
33. Electrical Installation Considerations
| Installation Item | Engineering Consideration |
|---|---|
| Incoming Voltage | 380–400 VAC, 3-Phase |
| Output Current | 460 A |
| Protective Device | Sized for the application |
| Grounding | Proper plant grounding required |
| Motor Cable | Sized for 460 A application |
| Cable Length | Evaluate for motor-drive compatibility |
| EMC | Consider shielding and cable routing |
| Cabinet | 800 mm deep MCC-style arrangement |
| Cooling | Forced Air |
| Braking | No internal dynamic-braking transistor |
| Network | EtherNet/IP |
| Service Access | Required |
34. Motor Selection
The motor should be evaluated according to its actual current and torque requirements.
| Motor Parameter | Recommended Evaluation |
|---|---|
| Motor Voltage | Must match the drive output system |
| Full-Load Current | Must be compatible with drive rating |
| Motor Power | Check ND and HD ratings |
| Motor Frequency | Confirm application requirement |
| Base Speed | Confirm required operating range |
| Maximum Speed | Verify mechanical limitations |
| Starting Torque | Important for heavy loads |
| Continuous Torque | Compare with load profile |
| Inertia | Important for acceleration/deceleration |
| Duty Cycle | Important for thermal sizing |
| Motor Insulation | Suitable for inverter operation |
| Motor Cable | Check length and construction |
35. Normal Duty Application Example
Consider a large industrial pump.
The motor operates continuously at approximately 220–240 kW.
The process requires variable flow.
The drive can control motor speed according to the required flow rate.
The motor does not require repeated high-torque acceleration or frequent rapid stops.
Such an application can be a suitable candidate for the 250 kW Normal Duty capability.
The final selection should still be based on actual motor nameplate current and operating conditions.
36. Heavy Duty Application Example
Consider a large conveyor with a substantial mechanical load.
The motor may need high torque during acceleration.
The conveyor may also experience load changes.
In this situation, the 200 kW Heavy Duty rating becomes more relevant than the 250 kW Normal Duty rating.
The drive selection should be based on the actual motor current and overload requirements.
If rapid stopping is required, the absence of an internal dynamic-braking transistor must also be considered.
37. Why Power Rating Alone Is Not Enough
A common mistake in drive selection is matching the VFD to the motor only by kW.
For example:
A 250 kW motor does not automatically require a 250 kW Normal Duty drive.
The correct drive depends on:
- Motor current
- Load torque
- Starting torque
- Overload
- Acceleration time
- Deceleration time
- Operating cycle
- Ambient temperature
- Altitude
- Motor speed range
The 460 A current rating is therefore one of the most important specifications of this model.
38. Communication and Automation
The PowerFlex 755 platform is designed to integrate with industrial automation systems.
A typical architecture is:
PLC → Industrial Ethernet → PowerFlex 755 → Motor
This architecture allows the control system to supervise the drive without requiring a local operator interface.
Typical information can include:
- Run status
- Speed reference
- Actual speed
- Motor current
- Frequency
- Faults
- Alarms
- Drive status
- Diagnostic information
This makes the drive suitable for large automated plants.
39. No Dynamic Braking — Application Impact
Because the 20G1AJC460AN0NNNNN is an AN0 configuration, it does not include the internal dynamic-braking transistor.
This does not make the drive unsuitable for high-inertia applications.
It simply means that the braking strategy must be considered separately.
For a load that can coast safely to a stop, the absence of dynamic braking may not be a problem.
For a machine that must stop rapidly, the braking architecture becomes an important part of the system design.
40. Maintenance
A large Frame 8 drive requires a structured maintenance program.
Recommended inspection areas include:
| Maintenance Area | Recommended Check |
|---|---|
| Cooling System | Check fans and airflow |
| Air Passages | Inspect for dust and obstruction |
| Power Connections | Check for heating and loose connections |
| Grounding | Verify ground integrity |
| Motor Cable | Inspect insulation and termination |
| Cabinet | Check contamination |
| Network | Check communication |
| Fault History | Review recurring faults |
| Parameters | Maintain approved backup |
| Temperature | Check abnormal heating |
| Fans | Monitor noise and condition |
| Mechanical Structure | Check mounting and access components |
41. Maintenance Advantages of Standardization
Using PowerFlex 755 drives throughout a plant can simplify maintenance.
Maintenance teams can standardize:
- Parameter management
- Troubleshooting methods
- Drive replacement procedures
- Network configuration
- Operator training
- Spare-parts planning
This becomes particularly useful in large manufacturing plants with many high-power motors.
42. Five Same-Series or Related Models
The following models are useful alternatives within the same PowerFlex 755 family and nearby 400 VAC power range.
| Model | Voltage | Current | Normal Duty | Heavy Duty | Frame | Main Difference |
|---|---|---|---|---|---|---|
| 20G1AJC540AN0NNNNN | 380–400 VAC | 540 A | 315 kW | 250 kW | Frame 8 | Higher current and power |
| 20G1AJC567AN0NNNNN | 380–400 VAC | 567 A | 315 kW | 250 kW | Frame 8 | Higher-current alternative |
| 20G1AJC650AN0NNNNN | 380–400 VAC | 650 A | 355 kW | 315 kW | Frame 8 | Higher-power application |
| 20G1AJC750AN0NNNNN | 380–400 VAC | 750 A | 400 kW | 315 kW | Frame 8 | Very high-power alternative |
| 20G1AJC460JN0NNNNN | 380–400 VAC | 460 A | 250 kW | 200 kW | Frame 8 | Updated configuration of same rating |
The neighboring 540 A, 567 A, 650 A and 750 A configurations provide clear capacity steps above the 460 A model. The JN0 version retains the same basic 460 A/250 kW ND/200 kW HD electrical class while representing the later catalog configuration.
43. Same-Series Model Comparison
| Model | Output Current | ND Rating | HD Rating | Frame | Typical Selection Reason |
|---|---|---|---|---|---|
| 20G1AJC460AN0NNNNN | 460 A | 250 kW | 200 kW | 8 | Reference model |
| 20G1AJC540AN0NNNNN | 540 A | 315 kW | 250 kW | 8 | Higher motor capacity |
| 20G1AJC567AN0NNNNN | 567 A | 315 kW | 250 kW | 8 | Higher-current alternative |
| 20G1AJC650AN0NNNNN | 650 A | 355 kW | 315 kW | 8 | Large industrial loads |
| 20G1AJC750AN0NNNNN | 750 A | 400 kW | 315 kW | 8 | Very large motor applications |
These models are useful when the motor load is larger than the 460 A configuration can accommodate.
44. Updated Replacement Comparison
The 20G1AJC460JN0NNNNN is the direct replacement configuration identified for the discontinued 20G1AJC460AN0NNNNN.
| Parameter | 20G1AJC460AN0NNNNN | 20G1AJC460JN0NNNNN |
|---|---|---|
| Series | PowerFlex 755 | PowerFlex 755 |
| Voltage | 380–400 VAC | 400 VAC class |
| Current | 460 A | 460 A |
| ND Rating | 250 kW | 250 kW |
| HD Rating | 200 kW | 200 kW |
| Frame | Frame 8 | Frame 8 |
| Enclosure | Type 12/IP54 | Type 12/IP54 |
| Cabinet Depth | 800 mm | 800 mm |
| Cooling | Forced Air | Forced Air |
| Input | AC with Precharge | AC with Precharge |
| DC Terminals | None | None |
| Filtering | Filtered | Filtered |
| CM Jumper | Installed/removed configuration differs | Installed |
| Dynamic Braking | None | None |
| HIM | Blank / No HIM | Blank / No HIM |
The replacement should not be treated as a simple mechanical swap without checking the exact enclosure, control configuration, firmware, network configuration, wiring and installation requirements.
45. Five Popular Allen-Bradley Models
| Model | Series | Voltage Class | Current / Power Class | Typical Application |
|---|---|---|---|---|
| 25B-D030N114 | PowerFlex 525 | 480 VAC class | 30 A class | Compact industrial machines |
| 25C-D030N114 | PowerFlex 523 | 480 VAC class | 30 A class | General-purpose motor control |
| 20G1AGE053JA0NNNNN | PowerFlex 755 | 600 VAC | 53 A / 50 HP ND | Medium industrial motors |
| 20G1AGC260JN0NNNNN | PowerFlex 755 | 400 VAC | 260 A / 132 kW ND | Large pumps and process machinery |
| 20G1AND302JA0NNNNN | PowerFlex 755 | 480 VAC | 302 A / 250 HP ND | Large industrial motor control |
These five models cover a broad range of motor-control requirements.
The PowerFlex 523 and 525 models are better suited to smaller machinery, while the PowerFlex 755 configurations are designed for substantially larger industrial motor systems.
46. Application Selection Table
| Application | Suitability | Important Consideration |
|---|---|---|
| Large Pump | Excellent | Verify motor current |
| Large Fan | Excellent | Check inertia and stopping |
| Large Blower | Excellent | Verify continuous loading |
| Large Conveyor | Very Good | Heavy Duty rating may be important |
| Material Handling | Very Good | Braking requirements must be evaluated |
| Mining Conveyor | Very Good | High current and mechanical load |
| Process Pump | Excellent | Variable-speed process control |
| Industrial Cooling | Excellent | Continuous-duty thermal conditions |
| Cement Equipment | Very Good | Heavy mechanical loads |
| Crusher | Application Dependent | Verify HD torque and overload |
| Mixer | Very Good | Check starting torque |
| Centrifuge | Application Dependent | Braking architecture is critical |
47. Product Advantages for Pump Systems
For large pumps, variable-frequency control can provide more flexible process operation.
Instead of operating a pump motor continuously at full speed, the drive can adjust speed according to process demand.
Potential benefits include:
- Variable flow
- Pressure control
- Controlled starting
- Reduced mechanical stress
- Remote monitoring
- Integration with process automation
The 250 kW Normal Duty capacity makes the model appropriate for substantial pump installations.
48. Product Advantages for Fan Systems
Large industrial fans can have considerable inertia.
The drive provides controlled motor acceleration and adjustable operating speed.
This can help:
- Reduce starting stress
- Adjust airflow
- Match process demand
- Reduce unnecessary motor operation
- Improve centralized control
For high-inertia fans, the stopping requirements should be reviewed because this catalog configuration does not include an internal dynamic-braking transistor.
49. Product Advantages for Conveyor Systems
For conveyors, controlled acceleration can be particularly valuable.
A gradual speed increase can reduce mechanical shock to:
- Belts
- Gearboxes
- Couplings
- Shafts
- Bearings
The drive can also provide adjustable conveyor speed for different production conditions.
However, if the conveyor requires rapid stopping, the braking system must be engineered separately.
50. Product Advantages for Large Industrial Plants
The PowerFlex 755 architecture is particularly useful when a plant contains many different motor sizes.
A plant can standardize on the same general drive family while using different current ratings and frame sizes.
This can simplify:
- Engineering
- Programming
- Maintenance
- Spare parts
- Operator training
- Troubleshooting
The 20G1AJC460AN0NNNNN fits into the high-power portion of such a standardized drive architecture.
51. Mechanical Planning
The large Frame 8 enclosure should be considered a major piece of electrical equipment.
Planning should include:
- Floor loading
- Access clearance
- Door opening
- Cable-entry space
- Cable bending radius
- Cooling airflow
- Maintenance clearance
- Lifting access
- Transportation route
The estimated 500–700 kg weight range is significant enough that normal manual handling should not be assumed.
The actual shipping and installation weight must be confirmed before the equipment is moved.
52. Control System Integration
A typical control arrangement can be:
Process Sensor → PLC → EtherNet/IP → PowerFlex 755 → Motor
The PLC can determine the required motor speed based on:
- Pressure
- Flow
- Temperature
- Production rate
- Material position
- Machine sequence
The drive then converts the speed reference into motor-control commands.
This arrangement is particularly useful for process automation.
53. Reliability Considerations
For a high-power drive, reliability depends on the complete installation.
Important factors include:
- Correct sizing
- Proper cooling
- Correct grounding
- Suitable motor cable
- Proper protection
- Appropriate environmental conditions
- Correct parameter configuration
- Preventive maintenance
A drive operating in a clean, properly ventilated electrical room will generally have a very different thermal environment from a drive installed in a hot process area.
54. Recommended Engineering Checks Before Purchase
Before purchasing or replacing the drive, verify:
- Motor voltage.
- Motor full-load current.
- Motor power.
- Normal Duty requirement.
- Heavy Duty requirement.
- Starting torque.
- Acceleration time.
- Deceleration time.
- Load inertia.
- Braking requirements.
- Input voltage.
- Input frequency.
- Enclosure requirements.
- Cabinet dimensions.
- Cooling requirements.
- Network requirements.
- Existing parameters.
- Replacement compatibility.
- Power-cable arrangement.
- Motor-cable length.
55. Recommended Spare Drive Information
For a production-critical installation, maintenance records should include:
| Information | Recommended Record |
|---|---|
| Catalog Number | 20G1AJC460AN0NNNNN |
| Series | PowerFlex 755 |
| Voltage | 380–400 VAC |
| Current | 460 A |
| ND Rating | 250 kW |
| HD Rating | 200 kW |
| Frame | 8 |
| Enclosure | Type 12/IP54 |
| Cooling | Forced Air |
| Braking | None |
| Network | EtherNet/IP |
| Parameters | Approved backup |
| Motor Data | Complete nameplate data |
| Installation Drawing | Approved drawing |
| Cabinet Layout | Current revision |
56. Overall Technical Evaluation
The Allen-Bradley 20G1AJC460AN0NNNNN is a high-capacity PowerFlex 755 drive designed for large industrial motor applications.
Its most important electrical characteristics are:
- 380–400 VAC
- Three-phase
- 460 A output
- 315 kW Light Duty
- 250 kW Normal Duty
- 200 kW Heavy Duty
- Frame 8
Its physical configuration is equally important:
- Type 12 / IP54
- 800 mm deep MCC-style enclosure
- Forced-air cooling
The drive is particularly appropriate for large pumps, fans, blowers, conveyors, process equipment and material-handling machinery.
The absence of an internal dynamic-braking transistor is an important selection characteristic.
For applications requiring controlled high-energy braking, the system designer should evaluate the braking strategy separately.
The 460 A rating and Frame 8 architecture make the model suitable for applications that are beyond the practical range of smaller PowerFlex 755 configurations.
57. Final Technical Specification Table
| Category | Specification |
|---|---|
| Brand | Allen-Bradley |
| Product Family | PowerFlex |
| Product Series | PowerFlex 755 |
| Product Type | Industrial AC Variable Frequency Drive |
| Catalog Number | 20G1AJC460AN0NNNNN |
| Input Voltage | 380–400 VAC |
| Phase | 3-Phase |
| Output Current | 460 A |
| Light Duty Rating | 315 kW |
| Normal Duty Rating | 250 kW |
| Heavy Duty Rating | 200 kW |
| Frame | Frame 8 |
| Cooling | Forced Air |
| Enclosure | Type 12 / IP54 |
| Cabinet Style | 800 mm Deep MCC Style |
| Input Type | AC Input with Precharge |
| DC Terminals | None |
| Filtering | EMC Filter |
| CM Jumper | Removed |
| Dynamic Braking | None |
| Communication | Embedded EtherNet/IP |
| Approx. Width | 600 mm class |
| Approx. Height | 2,000–2,200 mm class |
| Approx. Depth | 800 mm |
| Approx. Weight | 500–700 kg class |
| Installation | Floor-mounted MCC-style equipment |
| Main Applications | Pumps, fans, blowers, conveyors, process machinery |
| Main Advantage | High-current, high-power industrial motor control |
58. Final Product Summary
The Allen-Bradley 20G1AJC460AN0NNNNN PowerFlex 755 AC Drive is a large-frame industrial variable-frequency drive designed for high-power three-phase motor applications.
With a 460 A output rating, 250 kW Normal Duty capacity, 200 kW Heavy Duty capacity, and 315 kW Light Duty class, it provides substantial flexibility for large industrial machinery.
Its 380–400 VAC three-phase voltage class makes it particularly suitable for industrial facilities built around 400 VAC motor systems.
The Frame 8 architecture and 800 mm deep MCC-style Type 12/IP54 enclosure place the product firmly in the high-power industrial equipment category.
The drive is particularly well suited to large pumps, fans, blowers, conveyors, material-handling systems, process machinery, mining equipment, cement plants and other large rotating machinery.
The forced-air cooling system is essential for maintaining thermal performance, and the large cabinet should be integrated into the plant’s overall ventilation and heat-management strategy.
The EMC-filtered configuration is useful for installations where electromagnetic compatibility is important.
The AC input with precharge and no DC terminals provides a defined input-power architecture for the packaged drive.
One of the most important characteristics of the model is its lack of an internal dynamic-braking transistor.
For applications where the motor must decelerate a high-inertia load rapidly, the braking strategy should therefore be evaluated as part of the overall system design rather than assumed to be included in the drive.
The 20G1AJC460AN0NNNNN is best suited to applications where large motor capacity, high output current, industrial environmental protection and integration with an automated control system are the primary requirements.
For replacement projects, the catalog number should be checked carefully against the existing installation, especially with respect to voltage, current, duty rating, frame size, enclosure, filtering, common-mode configuration, communication, mechanical dimensions and braking requirements.
The later 20G1AJC460JN0NNNNN is identified as the direct replacement configuration for the discontinued AN0 model, but a replacement should still be treated as an engineering compatibility check rather than an assumption of a completely identical mechanical and electrical installation.