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Allen-Bradley 20G1AJD485AN0NNNNN PowerFlex 755 AC Drive

1. Product Introduction

The Allen-Bradley 20G1AJD485AN0NNNNN is a high-power PowerFlex 755 air-cooled AC drive designed for large industrial motor-control applications.

It is part of the PowerFlex 750-Series and belongs specifically to the PowerFlex 755 product family. The unit is intended for applications requiring substantial motor power, high output current, industrial enclosure protection, network communication, adjustable-speed operation, and reliable control of large motors.

The drive is designed for a 480 VAC, three-phase electrical system and provides a nominal 485 A output-current rating. It uses a large Frame 8 construction and an IP54 / NEMA Type 12, 800 mm deep MCC-style enclosure.

The catalog configuration is rated at approximately 450 HP for Light-Duty applications, 400 HP for Normal-Duty applications, and 350 HP for Heavy-Duty applications.

The drive uses forced-air cooling and is configured with AC input and precharge, no DC terminals, an EMC filter, the CM jumper removed, and no dynamic-braking option. It also incorporates embedded EtherNet/IP communication.

The final AN0 portion of the catalog number indicates the configuration without the enhanced local HIM option. This makes the model appropriate for installations where local operator-interface hardware is not required as part of the basic drive package.

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2. Brand and Product Series

Item	Specification
Brand	Allen-Bradley
Product Family	PowerFlex 750-Series
Product Series	PowerFlex 755
Product Type	Air-Cooled AC Drive
Catalog Number	20G1AJD485AN0NNNNN
Configuration	Packaged AC Drive
Cooling	Forced Air
Frame Size	Frame 8
Input Voltage	480 VAC
Input Phase	Three Phase
Rated Current	485 A
Light-Duty Rating	450 HP
Normal-Duty Rating	400 HP
Heavy-Duty Rating	350 HP
Enclosure	IP54
NEMA Enclosure	Type 12
Cabinet Style	800 mm Deep MCC Style
Input Configuration	AC Input with Precharge
DC Terminals	None
EMC Filter	Included
CM Jumper	Removed
Dynamic Braking	None
Local HIM	None / Blank Configuration
Communication	Embedded EtherNet/IP
Mounting Style	Floor Standing
Main Application	Large Industrial Motor Control

The catalog configuration identifies the 20G1AJD485AN0NNNNN as a PowerFlex 755 AC drive with embedded EtherNet/IP, air cooling, 485 A capacity, 480 VAC three-phase input, Frame 8 construction, IP54 / Type 12 protection, EMC filtering, removed CM jumper, no dynamic braking, and no local HIM.

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3. Product Positioning

The 20G1AJD485AN0NNNNN is positioned in the high-power range of the PowerFlex 755 family.

This is not a small machine-level variable-frequency drive.

It is a large industrial drive intended for motors in the several-hundred-horsepower range, where the electrical system, mechanical load, thermal management, and control architecture all require careful engineering.

The 485 A current rating provides additional capacity compared with the 430 A version of the same family.

This makes the model particularly useful when a 430 A-class drive is close to its application limit and additional current capacity is desirable.

The drive can be used for both variable-torque and more demanding constant-torque industrial applications, provided the motor current and overload requirements are within the applicable duty rating.

Typical applications include large pumps, fans, blowers, conveyors, material-handling systems, water-treatment equipment, mining equipment, cement machinery, process systems, and other large industrial machines.

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4. Main Technical Specifications

Parameter	Specification
Catalog Number	20G1AJD485AN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product Family	PowerFlex 750-Series
Product Type	Air-Cooled AC Drive
Input Voltage	480 VAC
Input Frequency	50/60 Hz class
Input Phase	3 Phase
Rated Output Current	485 A
Light-Duty Motor Rating	450 HP
Normal-Duty Motor Rating	400 HP
Heavy-Duty Motor Rating	350 HP
Frame	Frame 8
Cooling Method	Forced Air
Enclosure	IP54
NEMA Rating	Type 12
Cabinet Type	800 mm Deep MCC Style
Input Arrangement	AC Input with Precharge
DC Terminals	None
EMC Filter	Yes
Common-Mode Configuration	CM Jumper Removed
Dynamic Braking	None
HIM	Blank / No HIM
Network Interface	Embedded EtherNet/IP
Installation	Floor Standing
Approx. Height	2477 mm class
Approx. Width	600 mm class
Approx. Depth	800 mm
Approx. Weight	Approximately 644 kg
Weight Unit	kg
Main Use	Large Industrial Motor Control

The 480 V selection data places the 485 A model at 450 HP Light Duty, 400 HP Normal Duty, and 350 HP Heavy Duty, with a Frame 8 configuration.

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5. Electrical Rating

The most important characteristic of the 20G1AJD485AN0NNNNN is its 485 A output-current capability.

The drive is designed for a 480 VAC three-phase power system.

The available motor rating depends on the required duty classification.

Duty Classification	Continuous Current	1-Minute Overload	3-Second Overload	Motor Rating
Light Duty	485 A	534 A	Not applicable	450 HP
Normal Duty	414 A	621 A	745 A	400 HP
Heavy Duty	414 A	621 A	745 A	350 HP

The Light-Duty rating provides the highest horsepower capability.

The Normal-Duty and Heavy-Duty ratings reduce the continuous motor-power rating because these operating modes require greater overload capability.

This distinction is important when selecting the drive.

A motor should not be selected solely by comparing horsepower numbers.

The actual motor nameplate current, application load profile, acceleration requirements, overload frequency, ambient temperature, and operating cycle should all be considered.

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6. Light-Duty Operation

The Light-Duty rating is approximately 450 HP.

The continuous output-current rating is approximately 485 A.

This rating is particularly suitable for large variable-torque loads where the motor normally operates without severe overload conditions.

Typical applications include:

• Large centrifugal pumps.
• Large industrial fans.
• Cooling-water pumps.
• Ventilation systems.
• Large blowers.
• Process-air systems.
• Utility pumping systems.

Variable-torque equipment can often benefit from adjustable-speed operation because the motor does not always need to operate at full speed.

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7. Normal-Duty Operation

Under the Normal-Duty classification, the drive supports approximately 400 HP.

The continuous current is approximately 414 A.

The short-duration overload capability is higher than the continuous rating.

This makes the configuration appropriate for applications with moderate mechanical loading and occasional overload requirements.

Examples include:

• Large conveyors.
• Process pumps.
• Blowers.
• Material-handling equipment.
• Industrial machinery.
• Process equipment.

The Normal-Duty rating provides a useful middle point between energy-oriented variable-torque operation and more demanding Heavy-Duty applications.

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8. Heavy-Duty Operation

For Heavy-Duty applications, the motor rating is approximately 350 HP.

The continuous current is approximately 414 A, with increased short-duration overload capability.

Heavy-Duty selection is appropriate when the application involves demanding acceleration, high mechanical loading, or repeated overload conditions.

Potential applications include:

• Heavy conveyors.
• Crushers.
• Mixers.
• Material-handling systems.
• High-inertia machinery.
• Certain process machines.
• Industrial equipment with repeated acceleration cycles.

The Heavy-Duty rating should always be checked against the actual motor full-load current and overload requirements.

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9. Frame 8 Construction

The Frame 8 designation places this drive in the large physical-size category of the PowerFlex 755 family.

The unit is designed as a floor-standing industrial drive rather than a compact wall-mounted inverter.

A large frame is necessary because of the amount of electrical power being handled.

The cabinet accommodates high-power switching components, bus components, cooling equipment, control electronics, power connections, and associated electrical hardware.

For project planning, the physical envelope is approximately:

2477 mm high × 600 mm wide × 800 mm deep

with a planning weight of approximately 644 kg.

The actual installation drawing should be used for final mechanical design, lifting arrangements, transportation, and service-clearance calculations.

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10. Dimensions and Weight

Mechanical Parameter	Approximate Specification
Catalog Number	20G1AJD485AN0NNNNN
Frame Size	Frame 8
Height	Approximately 2477 mm
Width	Approximately 600 mm
Depth	Approximately 800 mm
Cabinet Depth	800 mm
Cabinet Style	MCC Style
Enclosure	IP54
NEMA Rating	Type 12
Approximate Weight	Approximately 644 kg
Weight	Approximately 644 kg
Mounting	Floor Standing
Cooling	Forced Air
Service Access	Front / cabinet service area
Installation Type	Industrial Electrical Room

The dimensions and weight above should be treated as practical planning values.

For a final installation drawing, the exact mechanical documentation for the configured unit should be used.

This is especially important because the unit is approximately 2.5 meters high and weighs several hundred kilograms.

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11. IP54 and NEMA Type 12 Protection

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

This provides a significantly more protected installation than an open-frame or basic IP20 drive.

It is suitable for many indoor industrial environments.

Typical installation locations include:

• Electrical rooms.
• Motor-control rooms.
• Factory production areas.
• Water-treatment facilities.
• Pumping stations.
• Manufacturing plants.
• Mining facilities.
• Cement plants.
• Process plants.

The enclosure does not eliminate the need for proper environmental control.

Excessive moisture, corrosive gases, conductive dust, extreme temperatures, or heavy contamination can still affect equipment reliability.

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12. Air-Cooled Construction

The 20G1AJD485AN0NNNNN is an air-cooled PowerFlex 755 drive.

At this power level, heat management becomes a major engineering consideration.

The power semiconductors and other electrical components generate heat during operation.

Forced-air cooling moves air through the drive to remove this heat.

The installation therefore needs sufficient ventilation and appropriate clearance.

If several large drives are installed in the same electrical room, the combined heat output should be considered in the room’s HVAC design.

Blocked airflow, dirty filters, failed fans, or excessive ambient temperature can increase thermal stress.

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13. AC Input with Precharge

The drive uses an AC input with precharge.

Large VFDs contain significant DC-bus capacitance.

When incoming power is first connected, these capacitors require controlled charging.

The precharge system limits the initial charging current and allows the DC bus to reach its operating condition in a controlled manner.

This is particularly important in a large Frame 8 drive because of the substantial amount of stored electrical energy involved.

Correct upstream protection, switching equipment, grounding, and power-distribution design are essential.

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14. EMC Filter

The 20G1AJD485AN0NNNNN is configured with an EMC filter.

Electromagnetic compatibility is an important consideration in high-power variable-frequency drive installations.

A VFD uses high-speed switching to generate the motor output waveform.

This switching process produces high-frequency electrical components that can potentially affect:

• Instrumentation.
• Sensors.
• Communication cables.
• Control wiring.
• Other electronic equipment.
• Grounding systems.
• Nearby drives.

The integrated filtering should therefore be considered together with the overall installation.

Motor-cable routing, grounding, cable shielding, separation between power and control cables, and cabinet layout remain important.

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15. CM Jumper Removed

The catalog configuration specifies the CM jumper removed.

This configuration affects the common-mode behavior of the drive and its relationship with the grounding system.

The choice should be consistent with the intended electrical installation.

It should not be changed casually after installation.

When high-power drives are installed, the grounding arrangement, EMC behavior, motor-cable construction, and filter configuration should be considered as a complete system.

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16. Dynamic Braking Configuration

The 20G1AJD485AN0NNNNN is configured with no dynamic braking.

This is an important point when the drive is applied to high-inertia machinery.

When a motor decelerates, mechanical energy can be transferred back into the drive’s DC bus.

If the application requires frequent or rapid deceleration, the regenerated energy must be properly managed.

Potentially affected applications include:

• Large conveyors.
• High-inertia fans.
• Large rotating machinery.
• Material-handling systems.
• Rapid-cycle machinery.
• Heavy process equipment.

Where substantial regenerative energy is expected, the braking requirements should be evaluated during the original drive-selection process.

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17. No Local HIM Configuration

The final portion of the catalog number indicates the AN0 configuration, which is supplied without a local HIM.

This makes the drive appropriate for installations where:

• Local operator control is not required.
• The automation system handles drive control.
• A separate interface is provided.
• The drive is installed inside a centralized electrical room.
• Parameter access is handled through the control system or engineering tools.

For applications requiring a local operator interface, a related HIM-equipped catalog configuration can be considered.

The absence of a HIM does not prevent the drive from being integrated into an automated control system.

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18. Embedded EtherNet/IP

The drive includes embedded EtherNet/IP communication.

This is one of the most useful characteristics of the PowerFlex 755 architecture.

The drive can become part of a centralized industrial automation network.

Typical network information can include:

• Start command.
• Stop command.
• Speed reference.
• Actual speed.
• Output current.
• Drive status.
• Fault status.
• Alarm information.
• Diagnostic data.
• Operating parameters.

This allows the drive to be integrated into larger machine-control or process-control systems.

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19. Product Applications

19.1 Large Water Pumps

Large water pumps are one of the most suitable applications for this drive.

The drive can regulate pump speed according to system demand.

Applications include:

• Water-transfer pumps.
• Raw-water pumps.
• Booster pumps.
• Cooling-water pumps.
• Process-water pumps.
• Industrial circulation pumps.
• Municipal pumping systems.

Variable-speed operation can help match pump output to actual demand.

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20. Wastewater Treatment

Wastewater-treatment facilities frequently use large motors.

Potential applications include:

• Lift pumps.
• Transfer pumps.
• Return-flow pumps.
• Sludge pumps.
• Aeration blowers.
• Process circulation systems.

The high-power rating of the 20G1AJD485AN0NNNNN makes it suitable for large pumping and blower systems when the motor current falls within the appropriate duty rating.

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21. Industrial Fans

Large fans can require hundreds of horsepower.

Applications include:

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

The drive allows fan speed to be adjusted rather than operating the motor continuously at maximum speed.

This can provide better process control and can reduce unnecessary energy consumption when the process is suitable for variable-speed operation.

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22. Large Blowers

Industrial blowers are used in many process industries.

Typical applications include:

• Aeration.
• Pneumatic conveying.
• Combustion air.
• Process air.
• Industrial ventilation.
• Chemical-process air systems.

The drive can regulate blower speed and communicate operating data to the plant control system.

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23. Conveyor Systems

Large conveyors are common in:

• Mining.
• Cement production.
• Aggregate processing.
• Ports.
• Bulk-material handling.
• Steel production.

A VFD can provide controlled acceleration and deceleration.

This can reduce mechanical shock to:

• Gearboxes.
• Couplings.
• Belts.
• Shafts.
• Bearings.
• Drive pulleys.

For high-inertia conveyor systems, the correct duty classification and braking requirements must be evaluated carefully.

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24. Mining Applications

Mining equipment frequently contains large electric motors.

The 20G1AJD485AN0NNNNN can be considered for applications such as:

• Ore conveyors.
• Material conveyors.
• Large fans.
• Dewatering pumps.
• Process pumps.
• Crushing-related auxiliary systems.
• Ventilation equipment.

The rugged floor-standing design and high current capacity are well suited to centralized industrial electrical installations.

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25. Cement Industry Applications

Cement plants contain numerous large motor loads.

Potential applications include:

• Raw-material conveyors.
• Process fans.
• Cooling fans.
• Large pumps.
• Material-handling systems.
• Auxiliary process equipment.

The PowerFlex 755 platform is useful when the drive needs to communicate with a centralized automation system.

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26. Steel Industry Applications

Steel-processing plants often use large motors continuously.

Potential applications include:

• Cooling-water pumps.
• Process fans.
• Conveyors.
• Material-handling equipment.
• Auxiliary process machinery.
• Utility systems.

The 485 A current capability provides sufficient capacity for a broad range of large industrial motor applications.

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27. Chemical and Process Industry Applications

Large process plants often use pumps and fans with variable-speed requirements.

Applications can include:

• Process pumps.
• Circulation pumps.
• Cooling systems.
• Blowers.
• Ventilation systems.
• Material-transfer equipment.

Network connectivity is particularly useful in these applications because the drive can exchange operating information with the process-control system.

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28. Advantages of the 20G1AJD485AN0NNNNN

28.1 High Current Capacity

The 485 A rating provides substantial motor-control capability.

It allows the drive to operate large industrial motors without requiring multiple smaller drives to perform the same task.

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28.2 High Horsepower Capability

The drive supports approximately:

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

This gives one drive platform a broad range of application possibilities.

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28.3 Flexible Duty Ratings

The three duty classifications allow the engineer to select the drive according to actual machine loading.

This is important because two motors with the same horsepower can have very different overload requirements.

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28.4 Industrial Frame 8 Construction

The Frame 8 design is suitable for large centralized motor-control systems.

It provides the physical space necessary for high-power electrical components and cooling equipment.

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28.5 IP54 / NEMA Type 12 Enclosure

The enclosure provides useful environmental protection for many indoor industrial applications.

It is well suited to electrical rooms and controlled industrial environments.

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28.6 Embedded EtherNet/IP

Integrated network communication allows the drive to become part of a plant automation architecture.

This simplifies the exchange of control, status, and diagnostic information.

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28.7 EMC Filtering

The integrated EMC filter supports better electromagnetic compatibility when the drive is installed correctly.

This is particularly useful in large installations with extensive control and communication wiring.

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28.8 Precharge System

The AC input precharge arrangement is important for controlling the charging of the high-power DC bus during startup.

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28.9 No Unnecessary Local HIM

For centralized automation systems, the AN0 configuration can be useful because the drive does not include an enhanced local operator interface as part of the base catalog configuration.

This can be appropriate when drive control and monitoring are performed through the plant automation network.

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29. Comparison with the 430 A Version

The 20G1AJD485AN0NNNNN is closely related to the 430 A model.

Parameter	20G1AJD430AN0NNNNN	20G1AJD485AN0NNNNN
Voltage	480 VAC	480 VAC
Rated Current	430 A	485 A
Light Duty	400 HP	450 HP
Normal Duty	350 HP	400 HP
Heavy Duty	300 HP	350 HP
Frame	8	8
Enclosure	IP54 / Type 12	IP54 / Type 12
Cooling	Forced Air	Forced Air
Cabinet Depth	800 mm	800 mm
EMC Filter	Yes	Yes
CM Jumper	Removed	Removed
Dynamic Braking	None	None
HIM	Blank / No HIM	Blank / No HIM
EtherNet/IP	Embedded	Embedded

The 485 A version provides a higher current and horsepower capacity than the 430 A configuration.

It can therefore be a practical choice when the motor current is above the comfortable operating range of the 430 A model.

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30. Five Recommended Same-Series or Related Models

The following five models are particularly relevant because they are closely related 480 VAC PowerFlex 755 Frame 8 configurations.

Model	Voltage	Rated Current	Light Duty	Normal Duty	Heavy Duty	Frame	Enclosure
20G1AJD430AN0NNNNN	480 VAC	430 A	400 HP	350 HP	300 HP	8	IP54 / Type 12
20G1AJD545AN0NNNNN	480 VAC	545 A	500 HP	450 HP	350 HP	8	IP54 / Type 12
20G1AJD617AN0NNNNN	480 VAC	617 A	600 HP	500 HP	400 HP	8	IP54 / Type 12
20G1AJD710AN0NNNNN	480 VAC	710 A	650 HP	600 HP	450 HP	8	IP54 / Type 12
20G1AJD740AN0NNNNN	480 VAC	740 A	700 HP	650 HP	500 HP	8	IP54 / Type 12

The 480 V PowerFlex 755 selection range includes these progressively higher-current configurations, providing a convenient path for selecting a larger drive when motor current or overload requirements increase.

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31. Detailed Comparison of Related Models

Model	Current	Light Duty	Normal Duty	Heavy Duty	Frame	Typical Selection
20G1AJD430AN0NNNNN	430 A	400 HP	350 HP	300 HP	8	Lower-capacity 480 V Frame 8
20G1AJD485AN0NNNNN	485 A	450 HP	400 HP	350 HP	8	Main model
20G1AJD545AN0NNNNN	545 A	500 HP	450 HP	350 HP	8	Higher-power application
20G1AJD617AN0NNNNN	617 A	600 HP	500 HP	400 HP	8	Very large motors
20G1AJD710AN0NNNNN	710 A	650 HP	600 HP	450 HP	8	Extremely high-power systems
20G1AJD740AN0NNNNN	740 A	700 HP	650 HP	500 HP	8	Maximum range among these choices

The 485 A version occupies an important position in this range.

It provides a useful step upward from the 430 A model without immediately moving to the much larger 545 A or higher-current configurations.

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32. Mechanical Comparison of Related Models

Model	Frame	Approx. Height	Approx. Width	Approx. Depth	Approx. Weight
20G1AJD430AN0NNNNN	8	2477 mm class	600 mm class	800 mm	Approx. 644 kg
20G1AJD485AN0NNNNN	8	2477 mm class	600 mm class	800 mm	Approx. 644 kg
20G1AJD545AN0NNNNN	8	2477 mm class	600 mm class	800 mm	Approx. 644 kg
20G1AJD617AN0NNNNN	8	2477 mm class	600 mm class	800 mm	Approx. 644 kg
20G1AJD710AN0NNNNN	8	2477 mm class	600 mm class	800 mm	Approx. 644 kg
20G1AJD740AN0NNNNN	8	2477 mm class	600 mm class	800 mm	Approx. 644 kg

The physical values should be regarded as approximate engineering-planning values.

Although these models share the Frame 8 / 800 mm MCC-style platform, exact cabinet configuration and final mechanical documentation should be used for final installation planning.

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33. Five Recommended Popular Allen-Bradley Models

For broader comparison, the following five models represent different capacity levels and product families.

Model	Series	Voltage Class	Approx. Power / Current	Format	Typical Application
25B-D030N114	PowerFlex 525	480 VAC Class	30 HP class	Compact VFD	Pumps, fans, conveyors
25C-D030N114	PowerFlex 523	480 VAC Class	30 HP class	Compact VFD	General machinery
20G1AGE053JA0NNNNN	PowerFlex 755	600 VAC	53 A	Frame 6	Industrial process equipment
20G1AGC260JN0NNNNN	PowerFlex 755	400 VAC	260 A	Frame 7	Pumps, fans, conveyors
20G1AND302JA0NNNNN	PowerFlex 755	480 VAC Class	302 A	Frame 7	Heavy industrial motor control

These models provide useful alternatives when the required motor power, voltage, enclosure, frame size, or installation format differs from the 20G1AJD485AN0NNNNN.

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34. Popular Model Comparison

Model	Product Series	Capacity Class	Main Advantage	Typical Application
25B-D030N114	PowerFlex 525	30 HP class	Compact and versatile	Pumps, fans, conveyors
25C-D030N114	PowerFlex 523	30 HP class	General-purpose machine control	Machinery
20G1AGE053JA0NNNNN	PowerFlex 755	53 A / 600 V	Higher-voltage industrial control	Process machinery
20G1AGC260JN0NNNNN	PowerFlex 755	260 A / 400 V	Medium/high-power control	Pumps and conveyors
20G1AND302JA0NNNNN	PowerFlex 755	302 A / 480 V	High-power industrial control	Large machinery

The first two models are substantially smaller than the 20G1AJD485AN0NNNNN.

They are more appropriate for compact equipment and smaller motors.

The PowerFlex 755 models are closer in architecture and application philosophy and are more appropriate when large industrial motors, process integration, and higher current are required.

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35. Application Selection Table

Application	Suitability	Reason
Large Centrifugal Pump	Excellent	High current and variable-speed capability
Water Transfer Pump	Excellent	Large motor and continuous operation
Cooling-Water Pump	Excellent	Adjustable motor speed
Wastewater Pump	Excellent	Large industrial pumping
Large Fan	Excellent	High-power variable-torque load
Industrial Blower	Excellent	Adjustable airflow
Mining Conveyor	Excellent	High motor capacity
Cement Conveyor	Excellent	Large material-handling systems
Steel Plant Auxiliary Equipment	Excellent	Large industrial motors
Process Pump	Excellent	Networked process control
Heavy Conveyor	Very Good	High current and overload capability
Material Handling	Very Good	Controlled acceleration
Small Pump	Poor / Oversized	Smaller VFD is generally more practical
Small Machine	Poor / Oversized	Excessive capacity

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36. Pump System Application

A large pump driven by a 400–450 HP motor is a natural application for this drive.

The motor can be started with a controlled acceleration profile.

Instead of immediately applying full-speed operation, the drive can progressively increase motor speed.

Once operating speed is reached, the drive can maintain the required process speed.

If the process demand changes, the speed reference can be adjusted.

This approach is particularly useful in large water and industrial pumping systems.

The embedded EtherNet/IP interface can also allow the pump drive to exchange status and operating information with the central automation system.

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37. Conveyor System Application

A large conveyor can have considerable mechanical inertia.

Starting such a system directly at full speed can result in high mechanical stress.

A variable frequency drive allows the acceleration rate to be controlled.

This can reduce mechanical shock and improve system coordination.

The drive can also be integrated with upstream and downstream machinery through the automation network.

For demanding conveyors, the engineer should pay particular attention to:

• Motor current.
• Acceleration time.
• Load inertia.
• Duty cycle.
• Braking.
• Conveyor length.
• Mechanical transmission.
• Starting frequency.
• Stop requirements.

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38. Fan System Application

A large industrial fan may not require maximum speed at all times.

The drive can vary the motor speed according to the process requirement.

This can improve airflow regulation.

Applications include:

• Furnace fans.
• Exhaust fans.
• Cooling fans.
• Ventilation systems.
• Combustion-air systems.
• Industrial process fans.

For variable-torque fan applications, the Light-Duty rating can provide particularly useful horsepower capacity.

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39. Blower System Application

Industrial blowers often operate continuously.

The drive can provide adjustable-speed control and networked monitoring.

Potential benefits include:

• Controlled airflow.
• Smooth acceleration.
• Adjustable process capacity.
• Centralized monitoring.
• Fault reporting.
• Easier process integration.

The 20G1AJD485AN0NNNNN is particularly appropriate when the blower motor is within the 350–450 HP range depending on the required duty class.

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40. Maintenance Considerations

Large Frame 8 drives should be incorporated into a structured preventive-maintenance program.

Maintenance personnel should regularly inspect:

• Cooling fans.
• Airflow paths.
• Cabinet cleanliness.
• Power connections.
• Grounding connections.
• Motor cables.
• Communication cables.
• Environmental conditions.
• Alarm history.
• Fault history.
• Drive operating temperatures.
• Cabinet ventilation.
• Signs of overheating.

Because the drive is a high-power system, abnormal conditions should be investigated before they develop into major equipment failures.

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41. Installation Considerations

The large physical size of the unit should be considered from the beginning of the project.

The approximate dimensions are:

2477 mm × 600 mm × 800 mm

and the approximate equipment weight is:

644 kg

This means the installation team should evaluate:

• Floor loading.
• Transportation routes.
• Door openings.
• Lifting equipment.
• Forklift capacity.
• Rigging arrangements.
• Service clearance.
• Cable routing.
• Ventilation.
• Maintenance access.

The drive should not be treated like a compact wall-mounted inverter during project planning.

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42. Electrical Room Requirements

A large drive produces substantial heat.

When several drives are installed together, the total heat load can become significant.

The electrical room should therefore have suitable:

• Ventilation.
• Air conditioning where required.
• Temperature control.
• Airflow management.
• Dust control.

The cabinet should have adequate clearance for cooling and maintenance.

The environment should also be checked for:

• Humidity.
• Corrosive gases.
• Conductive dust.
• Chemical contamination.
• Excessive vibration.
• Extreme ambient temperature.

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43. Network Integration

A typical control architecture can be represented as:

PLC → EtherNet/IP Network → PowerFlex 755 → Motor

The controller can provide:

• Run commands.
• Speed references.
• Stop commands.
• Reset commands.

The drive can provide:

• Actual speed.
• Output current.
• Drive status.
• Fault information.
• Alarm information.
• Diagnostic information.

This arrangement is particularly useful in automated factories and process plants.

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44. Selection Advantages of the 485 A Model

The 20G1AJD485AN0NNNNN provides a useful balance within the 480 V Frame 8 PowerFlex 755 range.

It is larger than the 430 A model but smaller than the 545 A, 617 A, 710 A, and 740 A configurations.

This makes it attractive when:

• The motor is above the 430 A drive’s practical range.
• A 400 HP Normal-Duty rating is required.
• A 350 HP Heavy-Duty rating is sufficient.
• Additional current capacity is needed.
• A large Frame 8 industrial enclosure is required.
• Embedded EtherNet/IP is needed.
• A local HIM is not necessary.

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45. Engineering Selection Checklist

Before selecting the 20G1AJD485AN0NNNNN for a project, the following information should be reviewed.

Selection Item	Requirement
Motor Voltage	Confirm 480 V-class compatibility
Motor Current	Confirm against applicable duty rating
Motor Horsepower	Check LD / ND / HD classification
Duty Cycle	Determine continuous and overload requirements
Acceleration	Check acceleration time and load inertia
Deceleration	Determine braking requirements
Regeneration	Evaluate regenerated energy
Environment	Check temperature, humidity, dust and contamination
Enclosure	Confirm IP54 / Type 12 suitability
Cooling	Verify ventilation and heat dissipation
Communication	Confirm EtherNet/IP requirements
HIM	Determine whether local operator interface is needed
EMC	Verify grounding, filtering and cable requirements
Physical Space	Allow approximately 2477 × 600 × 800 mm
Weight	Allow approximately 644 kg
Maintenance	Provide suitable service clearance
Transportation	Verify lifting and handling capacity

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46. Key Advantages Summary

Advantage	Description
485 A Output	High-capacity motor control
450 HP LD	Suitable for large variable-torque loads
400 HP ND	Strong general industrial capacity
350 HP HD	Suitable for demanding loads
Frame 8	Large industrial construction
IP54 / Type 12	Improved enclosure protection
800 mm Cabinet	Suitable for high-power equipment
Air Cooling	Forced-air thermal management
EtherNet/IP	Integrated industrial networking
EMC Filter	Improved electromagnetic compatibility
Precharge	Controlled DC-bus charging
No HIM	Suitable for centralized automation
Large Application Range	Pumps, fans, blowers, conveyors and process machinery
Industrial Construction	Designed for large motor-control systems

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47. Overall Product Parameter Table

Category	Detailed Specification
Brand	Allen-Bradley
Product Family	PowerFlex 750-Series
Product Series	PowerFlex 755
Catalog Number	20G1AJD485AN0NNNNN
Product Type	Air-Cooled AC Drive
Input Voltage	480 VAC
Phase	3 Phase
Rated Current	485 A
Light-Duty Rating	450 HP
Normal-Duty Rating	400 HP
Heavy-Duty Rating	350 HP
Frame Size	Frame 8
Cooling	Forced Air
Enclosure	IP54
NEMA Rating	Type 12
Cabinet Style	800 mm Deep MCC Style
Input	AC Input with Precharge
DC Terminals	None
EMC Filter	Included
CM Jumper	Removed
Dynamic Braking	None
HIM	Blank / No HIM
Communication	Embedded EtherNet/IP
Mounting	Floor Standing
Approx. Height	2477 mm
Approx. Width	600 mm
Approx. Depth	800 mm
Approx. Weight	644 kg
Weight Unit	kg
Primary Applications	Pumps, Fans, Blowers, Conveyors, Mining, Cement, Steel, Water Treatment, Process Machinery
Duty Classes	Light Duty / Normal Duty / Heavy Duty
Main Advantage	High-power industrial motor control

48. Final Product Assessment

The Allen-Bradley 20G1AJD485AN0NNNNN is a high-power PowerFlex 755 AC drive designed for large industrial motor applications.

Its 485 A output capacity, 480 VAC three-phase configuration, and Frame 8 construction make it appropriate for large motors and demanding industrial systems.

The three available duty classifications provide useful flexibility.

At approximately 450 HP Light Duty, the drive is particularly attractive for large variable-torque applications such as pumps, fans, and blowers.

At approximately 400 HP Normal Duty, it provides a strong option for general industrial motor applications.

At approximately 350 HP Heavy Duty, it can be used for more demanding loads where greater overload capability is required.

The IP54 / NEMA Type 12 enclosure makes it suitable for many indoor industrial installations, while the 800 mm deep MCC-style construction provides the physical space necessary for a high-power drive system.

The forced-air cooling system is appropriate for this power level, but adequate room ventilation and maintenance access remain important.

The integrated EMC filter and AC-input precharge arrangement address important requirements associated with high-power variable-frequency drive installations.

The