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Allen-Bradley 20G1AJF330JN4NNNNN PowerFlex 755 AC Drive

1. Product Overview

The Allen-Bradley 20G1AJF330JN4NNNNN is a high-power PowerFlex 755 AC Drive designed for large industrial motor-control applications.

It is a 690 VAC, three-phase, 330 A, Frame 8, air-cooled variable-frequency drive intended for large motors and high-power machinery.

The drive is configured as a packaged industrial unit with an IP54 / NEMA Type 12 enclosure and an 800 mm deep MCC-style construction.

Its rated power capability is approximately 355 kW for Light-Duty applications, 315 kW for Normal-Duty applications, and 250 kW for Heavy-Duty applications.

The drive includes embedded EtherNet/IP, making it suitable for integration into modern industrial automation systems where the VFD is controlled and monitored through a PLC, HMI, supervisory system, or plant network.

Compared with the JN0 configuration, the JN4 version includes an enhanced LCD, full-numeric Human Interface Module (HIM). The HIM is specified for IP66 / NEMA Type 4X/12 protection, making the JN4 configuration particularly useful when operators and maintenance technicians require local access to drive parameters, diagnostics and operating information.

The unit uses AC input with precharge and no DC terminals. It is also supplied with input filtering and the common-mode jumper installed, while dynamic braking is not included in this configuration.

This combination makes the 20G1AJF330JN4NNNNN particularly suitable for large pumps, fans, blowers, conveyors, compressors, mixers, material-handling systems and other large industrial machines.

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2. Product Identification

Parameter	Specification
Brand	Allen-Bradley
Product Family	PowerFlex
Product Series	PowerFlex 755
Product Type	High-Power Air-Cooled AC Drive
Catalog Number	20G1AJF330JN4NNNNN
Input Voltage	690 VAC
Input Phase	3 Phase
Rated Current	330 A
Light-Duty Rating	355 kW
Normal-Duty Rating	315 kW
Heavy-Duty Rating	250 kW
Frame Size	Frame 8
Cooling	Forced Air
Input Type	AC Input with Precharge
DC Terminals	None
Communication	Embedded EtherNet/IP
Filtering	Filtered
Common-Mode Jumper	Installed
Dynamic Braking	None
Enclosure	IP54 / NEMA Type 12
Cabinet Style	800 mm Deep MCC Style
Local Interface	Enhanced LCD / Full Numeric HIM
HIM Protection	IP66 / NEMA Type 4X/12
Mounting	Floor-Mounted
Intended Use	Large Industrial Motor Control

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3. Brand

The product brand is Allen-Bradley.

Allen-Bradley is widely recognized in industrial automation for PLC systems, motor control equipment, industrial networks, operator interfaces, safety products and variable-frequency drives.

Within the drive portfolio, the PowerFlex family covers a broad range of applications, from compact machine drives to very large industrial motor-control systems.

The 20G1AJF330JN4NNNNN is positioned toward the high-power end of this range.

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4. Product Series

The 20G1AJF330JN4NNNNN belongs to the PowerFlex 755 series.

PowerFlex 755 drives are designed for applications where a combination of high motor power, advanced control, network integration, diagnostics and flexible configuration is required.

The 755 platform is particularly appropriate for larger industrial machines.

Typical installations include:

• Large pumps.
• Large fans.
• Blowers.
• Conveyors.
• Compressors.
• Mixers.
• Material-handling equipment.
• Process machinery.
• Mining equipment.
• Utility equipment.
• Large production machines.

The 690 VAC version is particularly useful for large motors because higher motor voltage can allow high mechanical power to be delivered while keeping operating current at a manageable level.

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5. Main Electrical Parameters

Electrical Parameter	Specification
Catalog Number	20G1AJF330JN4NNNNN
Nominal Input Voltage	690 VAC
Input Phase	Three Phase
Rated Current	330 A
Light-Duty Power	355 kW
Normal-Duty Power	315 kW
Heavy-Duty Power	250 kW
Light-Duty Continuous Current	Approximately 370 A
Light-Duty 1-Minute Current	Approximately 407 A
Normal-Duty Continuous Current	330 A
Normal-Duty 1-Minute Current	Approximately 363 A
Normal-Duty 3-Second Current	Approximately 495 A
Heavy-Duty Continuous Current	Approximately 265 A
Heavy-Duty 1-Minute Current	Approximately 292 A
Heavy-Duty 3-Second Current	Approximately 398 A
Input Type	AC with Precharge
DC Terminals	None
Cooling	Forced Air
Frame	8
Filtering	Filtered
CM Jumper	Installed
Dynamic Braking	None
Communication	Embedded EtherNet/IP

The 330 A rating places this drive firmly in the high-power industrial category.

For variable-torque applications, the drive can be applied up to approximately 355 kW under the Light-Duty rating.

For Normal-Duty applications, the applicable power rating is approximately 315 kW.

For Heavy-Duty applications requiring greater overload capability, the applicable rating is approximately 250 kW.

The appropriate rating should always be selected according to the actual motor current and load characteristics rather than motor horsepower alone.

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6. Light-Duty, Normal-Duty and Heavy-Duty Ratings

The three duty ratings are important when selecting a large industrial VFD.

A drive that is appropriate for a centrifugal fan may not necessarily have the same capacity when applied to a high-torque conveyor.

Light-Duty

The Light-Duty rating is approximately 355 kW.

This rating is particularly relevant to variable-torque applications.

Typical examples include:

• Centrifugal pumps.
• Centrifugal fans.
• Large blowers.
• Cooling systems.
• Ventilation equipment.

Normal-Duty

The Normal-Duty rating is approximately 315 kW.

This is a useful reference for general industrial machinery where the motor operates under substantial load but does not require the maximum Heavy-Duty overload capability.

Typical examples include:

• Process pumps.
• Conveyors.
• General process machinery.
• Industrial fans.
• Material-handling equipment.

Heavy-Duty

The Heavy-Duty rating is approximately 250 kW.

This rating is intended for applications with greater torque demand and more demanding overload conditions.

Examples can include:

• High-torque conveyors.
• Mixers.
• Crushers.
• Material feeders.
• High-inertia machinery.
• Other constant-torque equipment.

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7. Overload Capability

The PowerFlex 755 architecture provides short-duration overload capability above the continuous current rating.

For the Light-Duty rating, the approximate values are:

Light-Duty Parameter	Value
Continuous Current	370 A
1-Minute Current	407 A
Power	355 kW

For the Normal-Duty rating:

Normal-Duty Parameter	Value
Continuous Current	330 A
1-Minute Current	363 A
3-Second Current	495 A
Power	315 kW

For the Heavy-Duty rating:

Heavy-Duty Parameter	Value
Continuous Current	265 A
1-Minute Current	292 A
3-Second Current	398 A
Power	250 kW

These short-duration current capabilities are important when the motor needs additional torque during acceleration or temporary load changes.

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8. Mechanical Specifications

Mechanical Parameter	Specification
Catalog Number	20G1AJF330JN4NNNNN
Frame	8
Enclosure	IP54 / NEMA Type 12
Cabinet Type	MCC Style
Nominal Cabinet Depth	800 mm
Approximate Height	2477 mm
Approximate Width	600 mm
Approximate Depth	800 mm
Approximate Filtered Depth	Up to approximately 898 mm
Approximate Base Drive Weight	Approximately 644 kg
Mounting	Floor-Mounted
Cooling	Forced Air
HIM	Door-Mounted Enhanced LCD / Full Numeric
HIM Protection	IP66 / NEMA Type 4X/12
Service Access	Front Cabinet Access
Installation Type	Industrial Electrical Room / MCC Area

The 20G1AJF330JN4NNNNN belongs to the large Frame 8 mechanical class.

A practical reference envelope for this type of IP54 / NEMA Type 12 Frame 8 cabinet is approximately:

2477 mm high × 600 mm wide × 800 mm deep.

The basic drive weight is approximately 644 kg.

The actual installed equipment weight can be higher when additional option cabinets or other equipment are included.

The filtered arrangement may also increase the effective depth to approximately 898 mm.

For foundation design, transportation, lifting and final installation, the exact mechanical drawing for the purchased configuration should be used.

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9. Enclosure and Environmental Protection

The drive uses an IP54 / NEMA Type 12 enclosure.

This is an important feature for industrial installations because the power electronics are enclosed rather than being supplied as an open-frame assembly.

The enclosure is suitable for many industrial electrical-room environments.

Potential installation locations include:

• Electrical rooms.
• MCC rooms.
• Manufacturing facilities.
• Process plants.
• Utility buildings.
• Water-treatment facilities.
• Material-handling facilities.
• Industrial production areas.

The enclosure should not be considered suitable for every outdoor or corrosive environment without additional evaluation.

Environmental factors such as conductive dust, corrosive gases, high humidity, salt exposure and extreme temperatures should be evaluated during system design.

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10. Cooling System

The 20G1AJF330JN4NNNNN uses forced-air cooling.

A 330 A high-power drive produces considerable heat during operation.

The cooling system moves air through the drive enclosure to remove heat from the power electronics.

This means the installation room must have sufficient heat-removal capability.

For large electrical rooms containing multiple VFDs, the combined heat output can become significant.

Important cooling considerations include:

• Ambient temperature.
• Airflow.
• Fan operation.
• Air filters.
• Cabinet ventilation.
• Room HVAC capacity.
• Dust accumulation.
• Installation altitude.

The cooling fans should be included in the preventive-maintenance program.

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11. Embedded EtherNet/IP

One of the major advantages of this configuration is embedded EtherNet/IP.

The drive can be integrated directly into a plant automation network.

Typical information exchanged through the network can include:

• Start commands.
• Stop commands.
• Speed references.
• Speed feedback.
• Current.
• Drive status.
• Warning information.
• Fault information.
• Diagnostic information.
• Process-control data.

This is particularly valuable when multiple large drives are installed throughout a plant.

Instead of treating each drive as an isolated piece of equipment, the drives can become networked components of the overall automation architecture.

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12. Enhanced LCD Full-Numeric HIM

The JN4 configuration is equipped with an enhanced LCD full-numeric Human Interface Module.

This is one of the most important differences between the JN4 and JN0 versions.

The local interface provides technicians with direct access to drive information.

Typical uses include:

• Viewing drive status.
• Viewing operating parameters.
• Entering configuration values.
• Reviewing fault information.
• Performing local diagnostics.
• Monitoring operating conditions.
• Commissioning the drive.
• Troubleshooting the motor system.

The HIM is specified for IP66 / NEMA Type 4X/12 protection.

This makes the JN4 configuration particularly useful where local maintenance access is important.

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13. JN4 Configuration Advantage

The JN4 configuration is useful when an installation requires both network control and local operator access.

For example, a large pump station may normally be controlled from a central PLC.

However, maintenance technicians may need to stand next to the drive during commissioning or troubleshooting.

A local HIM allows technicians to work directly with the drive without relying exclusively on the central HMI.

This makes the JN4 configuration particularly practical for:

• Commissioning.
• Maintenance.
• Troubleshooting.
• Parameter adjustment.
• Local status checking.
• Service operations.

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14. Input Configuration

The drive uses AC input with precharge.

The precharge system manages the initial charging of the internal DC-link capacitors.

This is important for high-power VFDs because the internal DC bus contains substantial capacitance.

The catalog configuration also specifies no DC terminals.

Therefore, this particular version is intended for a conventional AC-input architecture.

Applications requiring a common DC bus or specialized regenerative architecture should be evaluated against the appropriate PowerFlex configuration.

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15. Input Filtering

The drive is configured as Filtered.

Input filtering can help manage electrical noise and improve compatibility with the surrounding electrical system.

This is particularly relevant in installations containing:

• PLC systems.
• Industrial networks.
• Instrumentation.
• Measurement equipment.
• Process-control systems.
• Multiple VFDs.
• Sensitive electronic equipment.

Filtering is only one part of an overall EMC strategy.

Proper cable routing, grounding, shielding and installation practices remain important.

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16. Common-Mode Jumper

The catalog configuration specifies that the CM jumper is installed.

Common-mode configuration can affect the relationship between the drive’s electrical system and ground.

This should be considered together with:

• Motor insulation.
• Motor cable construction.
• Cable length.
• Grounding.
• EMC requirements.
• Power-system configuration.
• Bearing-current considerations.

For large 690 VAC motor installations, the complete drive/motor/cable system should be engineered as one electrical system.

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17. Dynamic Braking

The 20G1AJF330JN4NNNNN is configured with no dynamic-braking transistor.

This means the standard catalog configuration does not provide an integrated dynamic-braking transistor for dissipating regenerative energy through an external resistor arrangement.

This is an important consideration for machinery requiring rapid deceleration.

Applications that may require special braking analysis include:

• High-inertia loads.
• Rapid stopping.
• Overhauling loads.
• Vertical machinery.
• Large flywheels.
• Rapid-cycle machinery.

If braking requirements are significant, the appropriate braking architecture should be selected during the engineering stage.

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18. Application: Large Pumps

Large pumps are a major application area for this drive.

A pump does not always need to operate at full speed.

Variable-speed control can allow the motor speed to be adjusted according to the required process flow.

Potential applications include:

• Water-treatment pumps.
• Industrial process pumps.
• Cooling-water pumps.
• Circulation pumps.
• Utility pumps.
• Large wastewater pumps.
• Industrial fluid-transfer systems.

The 355 kW Light-Duty capacity is particularly useful for suitable variable-torque pump applications.

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19. Application: Large Fans and Blowers

Large fans and blowers are also well suited to high-power variable-speed control.

Applications include:

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

The ability to adjust motor speed according to process demand can provide more flexible operation than running the motor continuously at full speed.

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20. Application: Conveyors

Large conveyors can place substantial mechanical demands on the drive.

The motor may need significant torque during startup.

The PowerFlex 755 can provide controlled acceleration and deceleration.

This can reduce mechanical stress on:

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

Large conveyors in mining, aggregate handling, ports, cement plants and other material-handling environments can therefore be suitable applications.

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21. Application: Mining and Bulk Material Handling

The high-power 690 VAC architecture makes the drive suitable for large material-handling systems.

Potential applications include:

• Ore conveyors.
• Aggregate conveyors.
• Transfer conveyors.
• Feeders.
• Stockpile conveyors.
• Bulk material systems.
• Mining process machinery.
• Large rotating equipment.

For mining applications, environmental conditions must be carefully considered.

Dust, temperature, vibration and maintenance access can all affect the final installation design.

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22. Application: Compressors

Large compressors can require several hundred kilowatts of motor power.

The 20G1AJF330JN4NNNNN provides a high-power platform for compressor applications where variable-speed operation is appropriate.

Potential applications include:

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

The compressor manufacturer’s speed range, torque requirements, acceleration requirements and minimum operating speed should be checked before final drive selection.

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23. Application: Mixers and Agitators

Large industrial mixers can have demanding torque requirements.

The drive can provide controlled motor acceleration and variable-speed operation.

Potential applications include:

• Chemical processing.
• Mineral processing.
• Cement production.
• Slurry processing.
• Industrial batch processing.
• Large material mixing.

For high-torque applications, the Heavy-Duty rating should be considered rather than relying solely on the motor’s nameplate horsepower.

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24. Application: Process Machinery

The PowerFlex 755 platform can be used in large process machinery.

Potential equipment includes:

• Large rollers.
• Process lines.
• Industrial production machines.
• Material-processing equipment.
• Large rotating machinery.
• Production-line equipment.

EtherNet/IP communication can also allow motor speed and status information to be coordinated with the rest of the process-control system.

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25. Application: Water and Utility Infrastructure

The drive can also be used in large utility systems.

Examples include:

• Water pumping.
• Cooling-water circulation.
• Large ventilation systems.
• Utility blowers.
• Industrial wastewater systems.
• Process-water systems.

The enclosed IP54 / NEMA Type 12 construction can be particularly useful when the drive is installed in a dedicated electrical room.

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26. Application: Large Industrial Machinery

The drive is particularly suitable when a machine requires:

• High motor power.
• Variable speed.
• Controlled acceleration.
• Controlled deceleration.
• Network communication.
• Local maintenance access.
• High-current output.
• Industrial enclosure protection.
• Advanced diagnostics.

The combination of the 690 VAC platform and 330 A current rating provides substantial motor-control capability.

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27. Main Product Advantages

27.1 High Power Capacity

The 355 kW Light-Duty rating and 315 kW Normal-Duty rating provide substantial capacity for large motors.

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27.2 690 VAC Operation

The 690 VAC platform is appropriate for high-power motor systems.

Higher motor voltage can help keep current at a practical level for large power ratings.

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27.3 330 A Current Rating

The 330 A rating provides a useful capacity point within the 690 VAC PowerFlex 755 family.

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27.4 Multiple Duty Ratings

The Light-Duty, Normal-Duty and Heavy-Duty ratings allow the same basic drive platform to be matched to different load characteristics.

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27.5 Embedded EtherNet/IP

Network communication makes the drive suitable for modern PLC-based automation systems.

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27.6 Enhanced Local HIM

The JN4 configuration provides a full local operator interface.

This is particularly useful during commissioning and maintenance.

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27.7 IP66 / NEMA Type 4X/12 HIM

The enhanced HIM has a high level of enclosure protection, making it practical for industrial operator access.

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27.8 IP54 / NEMA Type 12 Drive Enclosure

The main drive enclosure provides protection suitable for many industrial electrical-room applications.

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27.9 Filtered Configuration

The integrated filtered configuration supports electrical-noise management within the overall installation.

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27.10 Frame 8 High-Power Architecture

Frame 8 construction provides the physical and thermal architecture required for large motor-control applications.

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28. JN4 Compared with JN0

The JN4 and JN0 versions are closely related configurations of the same PowerFlex 755 690 VAC platform.

Feature	20G1AJF330JN4NNNNN	20G1AJF330JN0NNNNN
Series	PowerFlex 755	PowerFlex 755
Voltage	690 VAC	690 VAC
Current	330 A	330 A
Light-Duty	355 kW	355 kW
Normal-Duty	315 kW	315 kW
Heavy-Duty	250 kW	250 kW
Frame	8	8
Enclosure	IP54 / Type 12	IP54 / Type 12
Cooling	Forced Air	Forced Air
EtherNet/IP	Yes	Yes
Filtering	Filtered	Filtered
CM Jumper	Installed	Installed
Dynamic Braking	None	None
Local HIM	Enhanced LCD / Full Numeric	Blank / No HIM
HIM Protection	IP66 / NEMA Type 4X/12	Not applicable
Best Fit	Local + network operation	Network-centric operation

The most significant practical difference is the local operator interface.

The JN4 is the better choice when maintenance and commissioning personnel need a local display and keypad.

The JN0 is more appropriate when the plant’s PLC, HMI and network provide the main operator interface.

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29. Five Related Models from the Same PowerFlex 755 Family

The following models are closely related 690 VAC PowerFlex 755 configurations.

Model	Voltage	Current	Light Duty	Normal Duty	Heavy Duty	Frame	Enclosure
20G1AJF265JN4NNNNN	690 VAC	265 A	315 kW	250 kW	200 kW	8	IP54 / Type 12
20G1AJF330JN4NNNNN	690 VAC	330 A	355 kW	315 kW	250 kW	8	IP54 / Type 12
20G1AJF370JN4NNNNN	690 VAC	370 A	400 kW	355 kW	300 kW	8	IP54 / Type 12
20G1AJF415JN4NNNNN	690 VAC	415 A	450 kW	400 kW	355 kW	8	IP54 / Type 12
20G1AJF460JN4NNNNN	690 VAC	460 A	500 kW	450 kW	400 kW	8	IP54 / Type 12

These models provide a convenient progression around the 330 A version.

The 265 A version is suitable when the motor current is lower.

The 370 A version provides additional capacity above 330 A.

The 415 A version is appropriate for even larger motors.

The 460 A version provides another step upward within the same 690 VAC family.

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30. Related Model Electrical Comparison

Model	Current	Light-Duty	Normal-Duty	Heavy-Duty	Frame
20G1AJF265JN4NNNNN	265 A	315 kW	250 kW	200 kW	8
20G1AJF330JN4NNNNN	330 A	355 kW	315 kW	250 kW	8
20G1AJF370JN4NNNNN	370 A	400 kW	355 kW	300 kW	8
20G1AJF415JN4NNNNN	415 A	450 kW	400 kW	355 kW	8
20G1AJF460JN4NNNNN	460 A	500 kW	450 kW	400 kW	8

The 330 A version sits near the middle of this group.

This makes it a practical selection for applications where a 265 A drive is too small but a 370 A or larger drive would provide unnecessary capacity.

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31. Mechanical Comparison of Related Models

Model	Approx. Height	Approx. Width	Approx. Depth	Approx. Weight	Frame
20G1AJF265JN4NNNNN	2477 mm class	600 mm class	800 mm class	644 kg class	8
20G1AJF330JN4NNNNN	2477 mm class	600 mm class	800 mm class	644 kg class	8
20G1AJF370JN4NNNNN	2477 mm class	600 mm class	800 mm class	644 kg class	8
20G1AJF415JN4NNNNN	2477 mm class	600 mm class	800 mm class	644 kg class	8
20G1AJF460JN4NNNNN	2477 mm class	600 mm class	800 mm class	644 kg class	8

These are Frame 8 cabinet-class reference dimensions and weights.

The actual final cabinet arrangement can vary according to options and configuration.

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32. Five Other Popular Allen-Bradley Models

The following models are useful comparisons across other Allen-Bradley drive families.

Model	Series	Voltage	Current	Power Rating	Frame	Enclosure	Typical Application
25B-D030N114	PowerFlex 525	380–480 VAC	30 A	20 HP ND / 15 HP HD	D	IP20	Compact machines
25C-D030N114	PowerFlex 527	380–480 VAC	30 A	20 HP ND / 15 HP HD	D	IP20	Networked machine control
20F1AND302JA0NNNNN	PowerFlex 753	480 VAC	302 A	250 HP ND / 200 HP HD	7	Industrial drive enclosure class	Large industrial motors
20G1AJE460JN4NNNNN	PowerFlex 755	600 VAC	460 A	500 HP LD / 500 HP ND / 400 HP HD	8	IP54 / Type 12	Large 600 VAC motors
20G1AJF415JN4NNNNN	PowerFlex 755	690 VAC	415 A	450 kW LD / 400 kW ND / 355 kW HD	8	IP54 / Type 12	High-power 690 VAC motors

These five models cover a wide range of motor-control requirements.

The 25B-D030N114 is intended for much smaller machines and is physically far smaller than the 20G series.

The 25C-D030N114 is also a compact machine-level drive and is useful for networked automation applications.

The 20F1AND302JA0NNNNN provides a comparison with the PowerFlex 753 platform at 480 VAC.

The 20G1AJE460JN4NNNNN provides a comparison within the PowerFlex 755 family at 600 VAC.

The 20G1AJF415JN4NNNNN is a particularly close comparison because it uses the same 690 VAC platform while providing higher current capability.

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33. Popular Model Application Comparison

Model	Primary Application	Main Strength	Relative Size
25B-D030N114	Compact machinery	Compact VFD with integrated network features	Small
25C-D030N114	Automated machinery	Network-centric machine control	Small
20F1AND302JA0NNNNN	Large industrial equipment	High-power 480 VAC control	Large
20G1AJE460JN4NNNNN	Large 600 VAC motors	High-current PowerFlex 755 platform	Very Large
20G1AJF415JN4NNNNN	Large 690 VAC motors	High-power 690 VAC operation	Very Large

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34. Why the 20G1AJF330JN4NNNNN Is Attractive

The 20G1AJF330JN4NNNNN offers a particularly useful combination of high-power capacity and local operator functionality.

The 690 VAC architecture makes it suitable for large industrial motors.

The 330 A output rating provides substantial current capacity.

The 315 kW Normal-Duty rating covers a wide range of industrial applications.

The 355 kW Light-Duty rating is useful for suitable variable-torque applications.

The 250 kW Heavy-Duty rating provides a reference point for demanding constant-torque loads.

The IP54 / NEMA Type 12 enclosure allows the drive to be installed in many industrial electrical environments.

The embedded EtherNet/IP interface allows integration with modern automation systems.

The JN4 HIM provides local access to the drive, which is particularly useful during commissioning and maintenance.

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35. Advantage of the Local HIM in Maintenance

Large industrial drives often require local access during commissioning.

A technician may need to:

• Verify motor data.
• Check current.
• Confirm speed feedback.
• Review fault codes.
• Check drive status.
• Adjust configuration parameters.
• Confirm communication.
• Test acceleration.
• Test deceleration.

Having the enhanced LCD full-numeric HIM directly on the drive can make these activities more convenient.

This is one of the clearest practical advantages of choosing the JN4 configuration rather than a no-HIM configuration.

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36. Advantage in Networked Automation

The drive can simultaneously provide local operator access and network integration.

This gives the system two useful control layers.

The local HIM can be used for:

• Commissioning.
• Maintenance.
• Diagnostics.

The EtherNet/IP network can be used for:

• Production control.
• PLC commands.
• Speed references.
• Remote status monitoring.
• Fault reporting.
• Process coordination.

This combination is useful in large production plants where both local maintenance and centralized control are required.

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37. Power Distribution Considerations

A 690 VAC, 330 A drive requires a properly engineered electrical system.

Important design considerations include:

• Transformer capacity.
• Incoming circuit protection.
• Short-circuit current.
• Cable ampacity.
• Grounding.
• Motor-cable construction.
• Harmonic performance.
• EMC requirements.
• Motor insulation.
• Disconnect equipment.
• Safety circuits.
• Heat dissipation.

The drive should therefore be considered as one component of the overall electrical distribution system.

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38. Motor Selection Considerations

The motor should be suitable for the drive’s 690 VAC application.

The following motor data should be reviewed:

Motor Parameter	Selection Consideration
Rated Voltage	Must be compatible with the 690 VAC system
Rated Current	Must fit within the selected drive duty rating
Motor Power	Must be within the applicable drive rating
Rated Speed	Verify required operating range
Starting Torque	Check against available drive torque
Continuous Torque	Compare with Heavy-/Normal-Duty requirements
Overload Requirement	Select appropriate duty class
Insulation	Verify suitability for VFD operation
Cable Length	Evaluate output-cable effects
Minimum Speed	Check motor cooling and mechanical limits
Maximum Speed	Verify mechanical limitations

Motor nameplate current should normally be one of the primary selection parameters.

Horsepower or kilowatt rating alone should not be used to select a high-power VFD.

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39. Mechanical Installation

The Frame 8 cabinet is physically large.

A nominal reference envelope of approximately:

2477 mm × 600 mm × 800 mm

should be considered during preliminary layout.

The approximate base weight is:

644 kg

The installation area should therefore be designed for heavy industrial equipment.

Considerations include:

• Floor loading.
• Transport path.
• Lifting equipment.
• Cabinet access.
• Cable routing.
• Door opening.
• Ventilation.
• Service clearance.
• Adjacent equipment.
• Future maintenance.

If option cabinets are added, the overall equipment footprint and weight can increase.

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40. Electrical Room Planning

Because the drive is large and air-cooled, electrical-room planning is important.

The room should provide:

• Adequate cooling.
• Adequate airflow.
• Sufficient service space.
• Suitable cable-entry arrangements.
• Appropriate grounding.
• Proper electrical separation.
• Access for maintenance.
• Sufficient lifting and replacement space.

A large drive can remain in service for many years, so maintenance access should be considered during the initial design rather than after installation.

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41. Preventive Maintenance

A practical maintenance program should include regular inspection of:

Item	Inspection Focus
Cooling Fans	Noise, operation, airflow
Airflow Passages	Dust and obstruction
Cabinet	Cleanliness and physical condition
Power Connections	Tightness and thermal condition
Grounding	Connection integrity
Motor Cables	Insulation and termination
EtherNet/IP	Communication reliability
HIM	Display and keypad operation
Fault History	Repeated faults
Motor Current	Abnormal changes
Cabinet Temperature	Overheating
Enclosure	Doors, seals and physical condition
Internal Components	Signs of thermal stress

The maintenance schedule should be adjusted to the actual operating environment.

A clean electrical room requires much less cleaning than a dusty mining or aggregate facility.

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42. Typical Industrial System Architecture

A typical installation could contain:

Plant PLC → EtherNet/IP Network → PowerFlex 755 → 690 VAC Motor → Mechanical Load

The local JN4 HIM provides a second access point:

Maintenance Technician → Local HIM → PowerFlex 755

This creates a practical combination of centralized automation and local service capability.

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43. Suitable Industries

The 20G1AJF330JN4NNNNN can be considered for many industries.

Water and Wastewater

Large pumping stations, water circulation and wastewater equipment.

Mining

Large conveyors, feeders, pumps and processing equipment.

Cement

Large fans, conveyors, mixers and material-handling machinery.

Metals

Large rollers, fans, pumps and process machinery.

Chemical Processing

Pumps, mixers, blowers and process equipment.

Manufacturing

Large production machinery and process lines.

Power and Utilities

Large fans, pumps, blowers and auxiliary systems.

Bulk Material Handling

Conveyors, feeders, transfer systems and processing machinery.

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44. Application Selection by Load Type

Load Type	Suitability	Typical Example
Variable Torque	Excellent	Centrifugal pump
Variable Torque	Excellent	Large fan
Variable Torque	Excellent	Blower
Constant Torque	Very Good	Conveyor
Constant Torque	Very Good	Mixer
High Inertia	Requires engineering	Large rotating machinery
Regenerative	Requires additional evaluation	Overhauling load
Rapid Deceleration	Requires braking analysis	High-speed machinery
Vertical Load	Requires application-specific design	Hoist-type equipment

The drive is especially attractive for large variable-torque equipment.

For regenerative and high-inertia applications, the braking requirements should be reviewed before selecting the final configuration.

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45. Comparison with Lower-Power Models

If the motor current is significantly below 330 A, a smaller model may provide a more economical solution.

For example, the 265 A version offers:

• Lower current capacity.
• Lower power capacity.
• Similar 690 VAC architecture.
• Similar Frame 8 construction.

If the motor current is close to or above the 330 A rating, moving to the 370 A or 415 A model may provide greater operating margin.

The correct choice should be based primarily on motor current, duty class and application requirements.

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46. Comparison with Higher-Power Models

The 370 A, 415 A and 460 A models provide progressively higher capacity.

This allows the PowerFlex 755 family to cover a broad range of large motors.

A simple selection concept is:

Motor Requirement	Possible PowerFlex 755 Selection
Up to approximately 265 A class	20G1AJF265JN4NNNNN
Around 330 A class	20G1AJF330JN4NNNNN
Around 370 A class	20G1AJF370JN4NNNNN
Around 415 A class	20G1AJF415JN4NNNNN
Around 460 A class	20G1AJF460JN4NNNNN

Final selection should always be based on the actual motor nameplate current and required duty rating.

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47. Overall Technical Advantages

The 20G1AJF330JN4NNNNN combines several important features in one industrial drive platform:

• High-voltage 690 VAC operation.
• 330 A output capability.
• 355 kW Light-Duty rating.
• 315 kW Normal-Duty rating.
• 250 kW Heavy-Duty rating.
• Frame 8 high-power construction.
• IP54 / NEMA Type 12 enclosure.
• Forced-air cooling.
• Embedded EtherNet/IP.
• Filtered input.
• Common-mode jumper installed.
• AC input with precharge.
• No DC terminals.
• Enhanced LCD full-numeric HIM.
• IP66 / NEMA Type 4X/12 HIM.

This combination makes the drive suitable for sophisticated large-motor installations.

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48. Final Technical Parameter Table

Parameter	Specification
Brand	Allen-Bradley
Series	PowerFlex 755
Model	20G1AJF330JN4NNNNN
Product Type	PowerFlex 755 AC Packaged Drive
Input Voltage	690 VAC
Input Phase	3 Phase
Rated Current	330 A
Light-Duty Rating	355 kW
Normal-Duty Rating	315 kW
Heavy-Duty Rating	250 kW
Frame Size	8
Cooling Method	Forced Air
Input Configuration	AC Input with Precharge
DC Terminals	None
Communication	Embedded EtherNet/IP
Filtering	Filtered
CM Jumper	Installed
Dynamic Braking	None
Drive Enclosure	IP54 / NEMA Type 12
Cabinet Depth	800 mm
Approx. Height	2477 mm
Approx. Width	600 mm
Approx. Depth	800 mm
Approx. Filtered Depth	898 mm
Approx. Base Weight	644 kg
Local HIM	Enhanced LCD / Full Numeric
HIM Enclosure Rating	IP66 / NEMA Type 4X/12
Mounting	Floor-Mounted
Main Applications	Pumps, fans, blowers, conveyors, compressors, mixers, process machinery
Recommended Environment	Industrial Electrical Room / MCC Area

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49. Final Product Summary

The Allen-Bradley 20G1AJF330JN4NNNNN is a high-capacity PowerFlex 755 AC drive designed for large industrial motor applications.

Its 690 VAC three-phase architecture and 330 A current rating place it in the high-power drive category.

The drive provides approximately 355 kW Light-Duty, 315 kW Normal-Duty and 250 kW Heavy-Duty capacity.

The Frame 8, IP54 / NEMA Type 12, 800 mm deep MCC-style construction is designed for large industrial electrical installations.

The embedded EtherNet/IP interface makes it suitable for integration with PLC-based automation systems.

The most distinctive feature of the JN4 version is its enhanced LCD full-numeric HIM, which provides convenient local access for commissioning, monitoring and maintenance.

The drive is particularly suitable for large pumps, fans, blowers, conveyors, compressors, mixers, mining equipment, bulk-material handling systems and other high-power rotating machinery.

For a project that requires a combination of high motor power, 690 VAC operation, network communication, industrial enclosure protection and local operator access, the 20G1AJF330JN4NNNNN is a strong PowerFlex 755 configuration.