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Allen-Bradley 20G1ABD485JN0NNNNN — PowerFlex 755 Air-Cooled AC Drive

1. Product Overview

The Allen-Bradley 20G1ABD485JN0NNNNN is a high-power PowerFlex 755 air-cooled AC drive designed for demanding industrial motor-control applications. It is a Frame 8 drive rated for 480 VAC, three-phase input and 485 A output current, with power ratings reaching approximately 450 HP for Light Duty, 400 HP for Normal Duty, and 350 HP for Heavy Duty applications.

The drive belongs to the PowerFlex 755 family within the PowerFlex 750-Series architecture. This product is intended for applications where high motor power, precise speed control, network integration, reliable operation, and flexible system configuration are important design requirements.

The 20G1ABD485JN0NNNNN uses forced-air cooling and an AC input with precharge. It is configured without DC terminals and uses a Type 1, IP20, 600 mm deep MCC-style enclosure arrangement.

One of the most important characteristics of this catalog number is its high-current capability combined with embedded EtherNet/IP communication. This makes it suitable for integration into large automated production systems, material-handling equipment, process machinery, pumps, fans, compressors, conveyors, and other large motor-driven equipment.

The catalog configuration uses a blank control interface without a standard HIM mounted on the drive. This allows the drive to be integrated into a larger control cabinet or automation system where operation and parameter management are primarily performed through a PLC, network connection, engineering workstation, or separately installed interface.

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2. Brand and Product Series

Item	Description
Brand	Allen-Bradley
Product Family	PowerFlex 750-Series
Product Series	PowerFlex 755
Product Type	Air-Cooled AC Drive / Variable Frequency Drive
Catalog Number	20G1ABD485JN0NNNNN
Drive Architecture	High-performance industrial AC drive
Cooling Method	Forced air / air cooled
Frame	Frame 8
Voltage Class	480 VAC, 3-phase
Output Current	485 A
Light Duty Rating	450 HP
Normal Duty Rating	400 HP
Heavy Duty Rating	350 HP
Communication	Embedded EtherNet/IP
Enclosure	Type 1, IP20, 600 mm deep MCC style
HIM Configuration	Blank / No HIM
Dynamic Braking	None
Input Configuration	AC input with precharge
DC Terminals	No
EMC Filtering	Filtered
CM Jumper	Installed
Product Status	Active configuration

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3. Main Technical Parameters

Parameter	Specification
Model / Catalog Number	20G1ABD485JN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Family	PowerFlex 750-Series
Drive Type	Air-Cooled AC Drive
Input Voltage	480 VAC
Input Phase	3 Phase
Output Current	485 A
Light Duty Rating	450 HP
Normal Duty Rating	400 HP
Heavy Duty Rating	350 HP
Approx. Light Duty Power	336 kW
Approx. Normal Duty Power	298 kW
Approx. Heavy Duty Power	261 kW
Voltage Class	480 VAC / 650 VDC class
Frame Size	Frame 8
Cooling	Forced Air
Input Type	AC Input with Precharge
DC Terminals	None
Dynamic Braking	None
EMC Filter	Filtered
CM Jumper	Installed
Enclosure	Type 1
IP Rating	IP20
Enclosure Style	600 mm Deep MCC Style
HIM	Blank / No HIM
Communication	Embedded EtherNet/IP
Control Architecture	PowerFlex 755 architecture
Approx. Dimensions H × W × D	Approximately 2100 × 610 × 465 mm
Approx. Weight	Approximately 634 kg
Installation	Large industrial cabinet / MCC-style installation
Typical Application Level	Large industrial motor systems

Dimensions and weight should be treated as approximate engineering values. Actual shipping or installed weight and overall dimensions can vary according to mounting arrangement, accessories, cabinet configuration, and associated hardware.

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4. Electrical Rating

The 20G1ABD485JN0NNNNN is designed around a 480 VAC three-phase industrial power system.

Its rated output current is 485 A, placing it in the high-power range of the PowerFlex 755 product family. The 485 A rating provides a substantial operating margin for large induction motors and other compatible AC motor loads.

The drive supports three different duty classifications. For Light Duty applications, the nominal rating is approximately 450 HP. For Normal Duty applications, the rating is approximately 400 HP. For Heavy Duty applications, the rating is approximately 350 HP.

This distinction is important because motor-drive selection should not be based solely on the motor nameplate horsepower. Actual load profile, overload requirement, acceleration time, starting torque, operating temperature, and application duty should also be considered.

Duty Classification	Current Class	Approx. Horsepower	Approx. Power
Light Duty	485 A class	450 HP	~336 kW
Normal Duty	485 A class	400 HP	~298 kW
Heavy Duty	485 A class	350 HP	~261 kW

The Heavy Duty rating is particularly relevant for applications requiring greater overload capability, frequent acceleration, high starting torque, or demanding transient loading.

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5. AC Input with Precharge

The 20G1ABD485JN0NNNNN uses an AC input arrangement with precharge.

The precharge function is important in a large industrial drive because the DC bus contains substantial energy-storage components. Controlled charging of the DC bus reduces uncontrolled inrush current and helps protect the internal power components during energization.

This arrangement is particularly useful on large Frame 8 drives because the input power level is considerably higher than that of small machine-mounted variable-frequency drives.

The drive does not use external DC terminals in this catalog configuration. The intended installation is therefore based on the specified AC input architecture rather than a shared external DC-bus arrangement.

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6. Forced-Air Cooling System

Because the drive operates at a high current rating, thermal management is a major part of its design.

The 20G1ABD485JN0NNNNN uses forced-air cooling. High-volume airflow passes through the power section to remove heat generated by the switching devices, bus components, control power circuitry, and associated electrical components.

The cooling system uses a backward-curved centrifugal fan arrangement. The associated fan system is designed for high-volume airflow suitable for large industrial drive assemblies.

Cooling Parameter	Approximate / Typical Value
Cooling Type	Forced Air
Fan Type	Backward Curved Centrifugal
Approx. Airflow	1805 m³/h
Approx. Fan Electrical Input	0.45 kW
Fan Efficiency	Approximately 63.7%
Drive Frame	Frame 8

Adequate cabinet ventilation is essential. The drive should not be installed in a confined enclosure without sufficient heat-removal capacity.

For a large drive of this size, enclosure thermal calculations should be performed during system design. Ambient temperature, cabinet heat dissipation, fan condition, air inlet temperature, airflow path, and filter condition all influence long-term reliability.

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7. Enclosure and Mechanical Configuration

The 20G1ABD485JN0NNNNN uses a Type 1, IP20, 600 mm deep MCC-style configuration.

This configuration is intended primarily for industrial electrical rooms, motor-control centers, control cabinets, and other controlled installation environments rather than exposed outdoor installation.

The approximate overall dimensions are in the following range:

Mechanical Parameter	Approximate Value
Height	~2100 mm
Width	~610 mm
Depth	~465 mm
Approx. Weight	~634 kg
Frame	Frame 8
Enclosure	Type 1 / IP20
Cabinet Style	600 mm Deep MCC Style
Installation Orientation	Vertical
Cooling	Forced Air

Because this is a large Frame 8 assembly, lifting and handling must be planned carefully. The installation structure must be capable of supporting the drive and associated power components.

The approximately 634 kg weight is an overall product-class reference rather than a universal shipping value. Packaging, accessories, mounting hardware, and configuration can change the final transportation weight.

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8. HIM Configuration

The 20G1ABD485JN0NNNNN is supplied with a blank control interface configuration and does not include a standard permanently mounted HIM on the drive itself.

This configuration is particularly suitable for installations where the drive is controlled from a centralized automation system.

For example, a plant may use a PLC-based control system with EtherNet/IP communication to send commands, reference values, status requests, fault resets, and parameter information to the drive.

A separate operator interface can also be used where required.

The absence of a permanently mounted HIM can be advantageous in large centralized control architectures because it avoids duplicating operator interfaces across multiple drives.

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9. Embedded EtherNet/IP Communication

Embedded EtherNet/IP is one of the important features of the 20G1ABD485JN0NNNNN.

EtherNet/IP allows the drive to participate directly in an industrial automation network, reducing the need for separate communication hardware for basic network integration.

Typical information exchanged between the drive and a controller can include:

• Start and stop commands.
• Speed reference.
• Frequency reference.
• Output frequency.
• Motor current.
• Drive status.
• Fault information.
• Warning information.
• Operating condition.
• Parameter data.
• Acceleration and deceleration control.
• Reset commands.

This makes the drive suitable for systems where the variable-frequency drive is an integrated part of a larger PLC-controlled machine or production line.

For large industrial systems, network integration can significantly simplify control wiring because many commands and monitoring functions can be transferred digitally instead of using large numbers of individual hardwired control signals.

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10. Product Introduction

The PowerFlex 755 series is designed for high-performance industrial AC motor applications where flexibility and control capability are more important than simply providing basic speed variation.

The 20G1ABD485JN0NNNNN represents a high-current Frame 8 configuration within this product family.

It is especially suitable for large motors that operate continuously or under changing process loads.

The drive can be used to control motor speed according to process requirements rather than operating a motor continuously at full speed.

For example, a pump does not necessarily need to operate at 100% speed throughout an entire production cycle. The drive can adjust motor speed according to pressure, flow, tank level, production demand, or other process variables.

The same principle applies to fans, conveyors, compressors, mixers, extruders, and many other motor-driven systems.

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11. Typical Applications

11.1 Pumps

The 20G1ABD485JN0NNNNN is well suited to large pump applications.

Typical examples include:

• Water treatment pumps.
• Industrial water circulation.
• Cooling-water pumps.
• Process pumps.
• Chemical process pumps.
• Wastewater systems.
• Mining water systems.
• Large irrigation systems.

Variable-speed control allows the pump to operate according to actual process demand rather than continuously running at maximum speed.

This can reduce unnecessary mechanical stress and improve process control.

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11.2 Fans and Blowers

Large fans and blowers are another strong application area.

Examples include:

• Industrial ventilation.
• Furnace fans.
• Boiler-related equipment.
• Dust collection systems.
• Process exhaust systems.
• Air-handling systems.
• Cooling towers.
• Industrial combustion air systems.

For fan applications, controlling motor speed according to airflow demand can provide substantial operating flexibility.

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11.3 Conveyors

Large conveyor systems can require considerable motor power, particularly in mining, bulk material handling, ports, warehouses, and heavy manufacturing.

The 485 A output capability makes this drive suitable for large conveyor motors when the motor and load requirements fall within the applicable duty rating.

The drive can provide controlled acceleration and deceleration, reducing sudden mechanical shock to belts, couplings, gearboxes, and other drivetrain components.

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11.4 Compressors

Large compressors frequently require controlled starting and variable-speed operation.

The drive can be integrated into compressor control systems where the motor speed needs to follow process requirements.

Applications may include:

• Industrial air compressors.
• Process gas systems.
• Refrigeration-related compressor systems.
• Chemical processing.
• Manufacturing utilities.
• Large centralized compressed-air systems.

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11.5 Mixers and Agitators

Large mixers and agitators often operate under changing mechanical loads.

A variable-frequency drive allows the motor speed to be adjusted according to material viscosity, process stage, production recipe, or required mixing intensity.

The PowerFlex 755 platform is well suited to these applications because it provides a combination of speed control, network communication, monitoring, and configurable drive functions.

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11.6 Industrial Machinery

The drive can also be used in large industrial machinery such as:

• Extrusion equipment.
• Material-processing machinery.
• Metal-processing equipment.
• Large machine tools.
• Production lines.
• Industrial winding systems.
• Heavy material handling equipment.
• Large process machines.

The actual suitability depends on motor type, torque characteristics, overload requirements, braking requirements, and the mechanical design of the machine.

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12. Main Advantages

12.1 High Current Capacity

The 485 A output rating is one of the primary advantages of this model.

It provides the capacity required for large industrial motors without moving immediately into a multi-drive arrangement.

This makes the unit appropriate for high-power machines and process systems where a single large motor is preferred.

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12.2 Flexible Duty Selection

The 20G1ABD485JN0NNNNN supports different application duty classifications.

The approximate ratings are:

• 450 HP Light Duty.
• 400 HP Normal Duty.
• 350 HP Heavy Duty.

This allows engineers to evaluate the same drive according to the actual mechanical loading requirements rather than treating horsepower as a single fixed value.

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12.3 Embedded EtherNet/IP

Integrated EtherNet/IP communication simplifies connection to a modern industrial automation architecture.

The drive can exchange control and status information with a controller without requiring a separate communication interface for basic network operation.

This is especially useful in production lines with many drives.

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12.4 Large Frame Industrial Construction

Frame 8 construction is intended for high-power industrial applications.

The larger physical structure provides the electrical and thermal capacity required for a 485 A-class drive.

This makes the model appropriate for large motor rooms, MCC systems, process plants, and heavy industrial installations.

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12.5 Forced-Air Thermal Management

The forced-air cooling system is designed to remove heat generated during high-current operation.

Good thermal management is particularly important for continuous-duty industrial equipment.

Proper airflow, cabinet ventilation, fan maintenance, and ambient-temperature control can all contribute to stable long-term operation.

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12.6 Precharge Input Design

The AC input with precharge provides controlled energization of the drive’s internal DC bus.

This is particularly important for high-power drives because uncontrolled inrush conditions would impose unnecessary stress on electrical components.

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12.7 Filtered Configuration

The catalog configuration includes filtering and an installed CM jumper arrangement.

This configuration is useful in industrial electrical environments where electromagnetic compatibility must be considered as part of system design.

Correct grounding, cable selection, motor cable routing, cabinet construction, and installation practices remain important even when the drive includes filtering.

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13. Maintenance Considerations

Maintenance of a large Frame 8 air-cooled drive should focus heavily on cooling and electrical connections.

The cooling fans should be inspected regularly.

Dust accumulation can reduce airflow and increase operating temperature. In harsh industrial environments, the inspection interval may need to be shorter than in clean electrical rooms.

Recommended maintenance checks include:

• Cooling fan condition.
• Air inlet condition.
• Air outlet condition.
• Cabinet ventilation.
• Electrical terminal tightness.
• Grounding connections.
• Motor cable condition.
• Input power connections.
• Visible signs of overheating.
• Abnormal noise.
• Fan vibration.
• Drive fault history.
• Network communication status.
• Motor operating current.
• Drive temperature.

For high-power equipment, preventive maintenance is normally preferable to waiting for a thermal or electrical fault to occur.

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14. Installation Considerations

Because the 20G1ABD485JN0NNNNN is a large Frame 8 drive, installation planning should be completed before the equipment is moved into position.

The mounting structure must be able to support the approximately 634 kg class of equipment.

Adequate clearance should be maintained around ventilation paths and service areas.

The installation environment should be clean enough to prevent excessive dust accumulation in the cooling system.

The following factors should be considered during installation:

Installation Item	Recommendation
Mounting	Secure vertical industrial mounting
Structural Capacity	Suitable for approximately 634 kg class
Ventilation	Provide sufficient forced-air circulation
Ambient Temperature	Keep within applicable drive specifications
Dust	Minimize dust entering cooling airflow
Grounding	Provide appropriate protective and high-frequency grounding
Motor Cable	Use suitable industrial motor cable
Cable Routing	Separate power and sensitive control wiring where appropriate
Network Wiring	Use suitable industrial Ethernet infrastructure
Maintenance Access	Maintain access for fan and electrical inspection
Lifting	Use suitable equipment for Frame 8 handling
Cabinet Design	Provide adequate thermal dissipation

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15. Control and Automation Architecture

The 20G1ABD485JN0NNNNN works well in a centralized PLC-controlled architecture.

A typical system can contain:

PLC / Controller → EtherNet/IP Network → PowerFlex 755 → Large AC Motor → Mechanical Load

The controller can provide the primary operating commands while the drive handles the motor-control functions.

This architecture can simplify machine programming and reduce the number of hardwired signals.

For example, a conveyor application could use the controller to send:

• Start command.
• Stop command.
• Speed reference.
• Direction command.
• Reset command.

At the same time, the drive can return:

• Running status.
• Actual speed.
• Output current.
• Fault status.
• Warning status.
• Drive ready status.
• Operating condition.

This two-way communication makes the drive a functional part of the machine-control system rather than simply a standalone motor-speed controller.

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16. Recommended Related Models — PowerFlex 755 Series

The following five models are useful related selections when evaluating the 20G1ABD485JN0NNNNN.

Model	Voltage	Current	Approx. Rating	Frame / Configuration	Typical Difference
20G1ABD430JN0NNNNN	480 VAC, 3 PH	430 A	~400 HP LD / 350 HP ND / 300 HP HD class	Frame 8	Lower-current alternative
20G1ABD485JN2NNNNN	480 VAC, 3 PH	485 A	450 HP LD / 400 HP ND / 350 HP HD	Frame 8	Similar electrical rating with HIM configuration
20G1ABD485JN4NNNNN	480 VAC, 3 PH	485 A	450 HP LD / 400 HP ND / 350 HP HD	Frame 8	Similar rating with door-mounted HIM configuration
20G1ABD545JN0NNNNN	480 VAC, 3 PH	545 A	~450 HP ND / 350 HP HD class	Frame 8	Higher-current selection
20G1ABD617JN0NNNNN	480 VAC, 3 PH	617 A	~500 HP ND / 400 HP HD class	Frame 8	Higher-current selection for larger motors

These models are particularly useful when the motor current or operator-interface requirement changes.

The 430 A model is a logical alternative when the motor load is smaller.

The 485 A variants are appropriate when the electrical rating remains the same but the HIM configuration needs to change.

The 545 A and 617 A versions become more appropriate when the motor requires greater current capacity.

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17. Detailed Comparison of Related 480 VAC Models

Model	Output Current	Light Duty	Normal Duty	Heavy Duty	HIM Configuration
20G1ABD430JN0NNNNN	430 A	~400 HP	~350 HP	~300 HP	Blank / No HIM
20G1ABD485JN0NNNNN	485 A	450 HP	400 HP	350 HP	Blank / No HIM
20G1ABD485JN2NNNNN	485 A	450 HP	400 HP	350 HP	Enhanced LCD / Local-Handheld configuration
20G1ABD485JN4NNNNN	485 A	450 HP	400 HP	350 HP	Door-mounted HIM
20G1ABD545JN0NNNNN	545 A	~450 HP	~400 HP	~350 HP class	Blank / No HIM

The 20G1ABD485JN0NNNNN is particularly attractive when the control architecture already has a centralized operator interface or PLC system and there is no need for a permanently mounted HIM on the drive.

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18. 430 A vs. 485 A vs. 545 A Selection

The current rating is one of the most important factors when selecting a PowerFlex 755 drive.

Selection	Current Class	Application Position
20G1ABD430JN0NNNNN	430 A	Suitable for somewhat smaller 480 V motor loads
20G1ABD485JN0NNNNN	485 A	High-power general industrial selection
20G1ABD545JN0NNNNN	545 A	Higher-power motor applications
20G1ABD617JN0NNNNN	617 A	Larger heavy-duty industrial loads
20G1ABD710JN0NNNNN	710 A	Very large 480 V motor applications

For engineering selection, the motor nameplate current should normally be compared directly with the drive’s applicable duty rating.

Horsepower alone should not be used as the only selection criterion.

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19. Five Popular Allen-Bradley Models

The following models are useful examples of widely used Allen-Bradley drive products from different PowerFlex families.

Model	Series	Voltage / Current Class	Approx. Application	Configuration
25B-D030N114	PowerFlex 525	480 VAC class / ~30 A class	General industrial motor control	Compact AC drive
25C-D030N114	PowerFlex 527	480 VAC class / ~30 A class	Machine automation and networked applications	Compact Ethernet-oriented drive
20G1ABC302JN4NNNNN	PowerFlex 755	400 VAC class / 302 A	Large industrial motors	Air-cooled, Frame 6/7 class
20G1ABC460JN4NNNNN	PowerFlex 755	400 VAC class / 460 A	Large pumps, fans, conveyors	High-power air-cooled drive
20G1ABC650JN4NNNNN	PowerFlex 755	400 VAC class / 650 A	Heavy industrial motor applications	Large-frame PowerFlex 755

The 25B and 25C models are much smaller than the 20G1ABD485JN0NNNNN and should not be considered direct electrical replacements.

They are included as popular same-brand examples because they represent different segments of the same industrial variable-frequency-drive product portfolio.

For applications involving motors in the several-hundred-horsepower range, the PowerFlex 755 family is the more appropriate product class.

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20. Comparison With Compact PowerFlex Drives

The 20G1ABD485JN0NNNNN and smaller PowerFlex drives serve very different application requirements.

Feature	20G1ABD485JN0NNNNN	25B-D030N114
Product Class	High-power industrial drive	Compact general-purpose drive
Series	PowerFlex 755	PowerFlex 525
Output Current	485 A	~30 A class
Voltage	480 VAC, 3 PH	480 VAC class
Frame	Frame 8	Compact frame
Application Size	Large motors	Small and medium motors
Cooling	Forced air	Compact drive cooling
Installation	MCC / large cabinet	Machine or control cabinet
Communication	Embedded EtherNet/IP	Network-capable
Typical Application	Heavy industrial	General machine automation
Physical Size	Large	Compact
Approx. Weight	~634 kg class	Much lighter

This comparison illustrates why catalog-number selection should be based on actual motor current, duty cycle, installation environment, and control architecture.

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21. Applications Where This Model Is Especially Suitable

The 20G1ABD485JN0NNNNN is particularly appropriate when several of the following conditions exist:

• Motor power is in the large industrial range.
• The system operates from a 480 VAC three-phase supply.
• Motor current approaches the 485 A class.
• The application requires variable-speed operation.
• EtherNet/IP integration is desirable.
• A centralized PLC is already present.
• A permanently mounted HIM is not required.
• The equipment is installed in a controlled industrial electrical environment.
• Forced-air cooling is acceptable.
• The installation has sufficient cabinet space.
• High-power motor acceleration needs to be controlled.
• Process speed needs to change according to production demand.

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22. Examples of Practical Industrial Applications

Water and Wastewater

Large pumps can be controlled according to flow, pressure, tank level, or process demand.

Mining

Large conveyors, pumps, crushers, fans, and material-handling systems can require high-current AC drives.

Steel and Metal Processing

Large rollers, fans, pumps, conveyors, and processing equipment can benefit from controlled motor speed and acceleration.

Chemical Processing

Pumps, mixers, agitators, fans, compressors, and other process equipment can use variable-speed motor control.

Cement and Building Materials

Conveyors, fans, crushers, feeders, and process machinery frequently require large motor drives.

Manufacturing

Large production machines and centralized material-handling systems can use the PowerFlex 755 for coordinated motor control.

Utilities

Large pumps, blowers, fans, and auxiliary mechanical equipment can be integrated into centralized automation systems.

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23. Why the No-HIM Configuration Can Be Useful

The blank HIM configuration is not necessarily a disadvantage.

In a modern industrial automation system, the drive may be installed inside a large MCC or electrical cabinet while operators interact with the equipment through a centralized HMI.

In this type of architecture, the PLC and HMI may already provide:

• Start/stop control.
• Speed adjustment.
• Status indication.
• Alarm display.
• Fault reset.
• Maintenance information.
• Production data.
• Drive diagnostics.

A local HIM mounted on every drive may therefore be unnecessary.

The 20G1ABD485JN0NNNNN provides a clean solution for this type of centralized control architecture.

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24. Communication and System Integration Advantages

The embedded EtherNet/IP interface is particularly valuable in plants containing multiple PowerFlex drives.

A typical production line might contain several high-power motors, each controlled by an individual drive.

Instead of routing large numbers of discrete control wires between each drive and the main PLC, the system can use network communication for many control and monitoring functions.

This can simplify:

• Panel wiring.
• PLC programming.
• Drive status monitoring.
• Fault diagnosis.
• Production data collection.
• Parameter management.
• Preventive maintenance.

It also makes it easier to standardize control structures across multiple machines.

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25. Drive Selection Checklist

Before selecting the 20G1ABD485JN0NNNNN for a project, the following items should be checked.

Selection Item	Required Check
Motor Voltage	Confirm compatibility with 480 VAC system
Motor Current	Compare motor nameplate current with applicable drive rating
Motor Power	Verify HP / kW against duty classification
Duty Cycle	Determine LD, ND, or HD requirement
Overload	Verify required overload magnitude and duration
Acceleration	Check required acceleration time
Deceleration	Determine whether braking is required
Braking	This catalog number has no dynamic braking
Environment	Verify temperature, humidity, dust, altitude, and ventilation
Enclosure	Confirm Type 1 / IP20 is suitable
HIM	Confirm whether no HIM is acceptable
Communication	Confirm EtherNet/IP requirements
Motor Cable	Verify cable type and length
Grounding	Verify grounding and EMC installation requirements
Cabinet	Check available mounting space
Weight	Confirm structure can support approximately 634 kg class
Cooling	Verify cabinet airflow and heat dissipation
Maintenance	Provide adequate service access

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26. Important Engineering Consideration — Motor Duty

The 20G1ABD485JN0NNNNN should not simply be selected because a motor is labeled “400 HP.”

The application duty cycle is equally important.

A motor operating with relatively stable torque may fit within the Normal Duty rating, while a motor subjected to frequent acceleration, overload, shock loading, or high starting torque may require the Heavy Duty selection.

For example, a conveyor carrying a variable bulk load can have considerably different torque requirements from a continuously operating centrifugal fan.

Therefore, the correct selection should consider:

Motor nameplate current + motor voltage + load torque + overload requirement + duty cycle + acceleration/deceleration profile.

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27. Weight and Handling

The 20G1ABD485JN0NNNNN is a very large industrial drive.

An approximate product weight of around 634 kg should be used for preliminary mechanical planning.

This is substantially heavier than compact variable-frequency drives.

Before installation, the project should verify:

• Transportation route.
• Door and opening dimensions.
• Lifting equipment.
• Floor loading.
• Cabinet support.
• Mounting hardware.
• Service access.
• Replacement procedure.
• Removal path.

For Frame 8 equipment, mechanical handling should be treated as an engineering task rather than normal small-drive installation.

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28. Dimensions and Space Planning

The approximate physical envelope is around:

2100 mm high × 610 mm wide × 465 mm deep

These dimensions should be treated as a planning reference rather than a substitute for the final mechanical drawing.

The final installation dimensions can depend on the specific enclosure arrangement, mounting structure, accessories, incoming and outgoing cable configuration, and service clearances.

For cabinet engineering, the actual project drawing should always be checked before fabrication.

The large vertical dimension is particularly important when the drive is being installed into an existing MCC or electrical room.

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29. Product Advantages at a Glance

Advantage	Engineering Benefit
485 A Output	Suitable for large industrial motors
450 HP LD Rating	Supports large Light Duty applications
400 HP ND Rating	Suitable for substantial continuous industrial loads
350 HP HD Rating	Supports demanding torque applications
480 VAC Three-Phase	Suitable for common industrial power systems
Frame 8	High-power construction
Forced-Air Cooling	Effective thermal management for large drive
Embedded EtherNet/IP	Simplified automation integration
AC Input with Precharge	Controlled DC-bus energization
Filtered Configuration	Helps address EMC considerations
No Dynamic Braking	Simple configuration for applications without regenerative braking requirements
Blank / No HIM	Suitable for centralized PLC/HMI architectures
MCC-Style Construction	Practical for large industrial electrical installations
PowerFlex 755 Platform	Flexible high-performance drive architecture

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30. Overall Technical Assessment

The Allen-Bradley 20G1ABD485JN0NNNNN is a high-capacity PowerFlex 755 AC drive designed for large industrial motor-control applications.

Its 485 A output rating places it firmly in the high-power segment of the PowerFlex 755 family.

The combination of 480 VAC three-phase operation, Frame 8 construction, forced-air cooling, embedded EtherNet/IP, AC input with precharge, EMC filtering, and the blank HIM configuration makes it especially suitable for centralized industrial automation systems.

The model is particularly attractive for users who already have a PLC and HMI architecture and do not require a local operator keypad permanently mounted on the drive.

For pumps, fans, conveyors, compressors, mixers, process machinery, mining equipment, material-handling systems, and other large motor-driven equipment, the 20G1ABD485JN0NNNNN provides the current capacity and communication capability required for a high-power industrial installation.

Its approximately 634 kg class weight and large Frame 8 physical structure mean that mechanical installation, lifting, ventilation, cabinet space, and maintenance access must be considered carefully.

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31. Final Technical Parameter Table

Parameter	20G1ABD485JN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Family	PowerFlex 750-Series
Product Type	Air-Cooled AC Drive
Catalog Number	20G1ABD485JN0NNNNN
Input Voltage	480 VAC
Input Phase	3 Phase
Output Current	485 A
Light Duty	450 HP
Normal Duty	400 HP
Heavy Duty	350 HP
Approx. Light Duty Power	336 kW
Approx. Normal Duty Power	298 kW
Approx. Heavy Duty Power	261 kW
Voltage Class	480 VAC / 650 VDC class
Frame	Frame 8
Cooling	Forced Air
Fan Type	Backward Curved Centrifugal
Approx. Airflow	1805 m³/h
Fan Input Power	Approximately 0.45 kW
Input Type	AC Input with Precharge
DC Terminals	None
Dynamic Braking	None
EMC Filtering	Filtered
CM Jumper	Installed
Communication	Embedded EtherNet/IP
HIM	Blank / No HIM
Enclosure	Type 1
IP Rating	IP20
Enclosure Style	600 mm Deep MCC Style
Approx. Height	~2100 mm
Approx. Width	~610 mm
Approx. Depth	~465 mm
Approx. Weight	~634 kg
Installation	Industrial MCC / Electrical Cabinet
Typical Applications	Pumps, fans, conveyors, compressors, mixers, process machinery
Primary Application Level	Large Industrial Motor Control

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32. Recommended Model Summary

For a 480 VAC high-power installation, the following PowerFlex 755 models provide a useful selection range:

Model	Current	Approx. Duty Position	Main Reason to Consider
20G1ABD430JN0NNNNN	430 A	Lower than 485 A	Smaller motor/load
20G1ABD485JN0NNNNN	485 A	450/400/350 HP LD/ND/HD	Main high-power selection
20G1ABD485JN2NNNNN	485 A	450/400/350 HP LD/ND/HD	Alternative HIM arrangement
20G1ABD485JN4NNNNN	485 A	450/400/350 HP LD/ND/HD	Door-mounted HIM configuration
20G1ABD545JN0NNNNN	545 A	Higher current	Larger motor/load

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33. Conclusion

The Allen-Bradley 20G1ABD485JN0NNNNN is a large-frame PowerFlex 755 air-cooled AC drive intended for demanding industrial motor-control systems.

Its 485 A output capability, 480 VAC three-phase input class, 450 HP Light Duty rating, 400 HP Normal Duty rating, and 350 HP Heavy Duty rating make it suitable for a wide range of large motor applications.

The embedded EtherNet/IP interface makes it well suited to PLC-based automation systems, while the blank HIM configuration is appropriate where operator control is handled through a centralized HMI or supervisory system.

The forced-air cooling architecture provides the thermal management required for high-current operation, while the AC input with precharge provides a suitable input arrangement for large industrial installations.

For engineering teams selecting a drive for pumps, fans, conveyors, compressors, mixers, material-handling equipment, process machinery, and other large motor applications, the 20G1ABD485JN0NNNNN should be evaluated against motor nameplate current, duty cycle, overload requirements, braking requirements, installation environment, network architecture, cabinet dimensions, cooling requirements, and mechanical handling requirements.

With its high-current Frame 8 architecture and industrial communication capability, it is best viewed as a large-system drive rather than a compact machine-mounted inverter. Its strongest application area is large industrial equipment where reliable variable-speed motor control and integration with a centralized automation system are both required.