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Allen-Bradley 20G1AJD485AN4NNNNN PowerFlex 755 AC Drive

1. Product Overview

The Allen-Bradley 20G1AJD485AN4NNNNN is a high-power PowerFlex 755 air-cooled AC drive designed for large industrial motor-control applications.

It belongs to the PowerFlex 750-Series and is specifically part of the PowerFlex 755 drive family.

This catalog configuration is designed for a 480 VAC, three-phase power system and provides a nominal 485 A output-current rating.

The drive is intended for large motors and demanding industrial machinery where adjustable-speed control, high current capacity, industrial enclosure protection, network communication, and flexible duty ratings are required.

The 20G1AJD485AN4NNNNN is a Frame 8 drive with an IP54 / NEMA Type 12, 800 mm deep MCC-style cabinet.

Its motor-power capability is 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 an AC input arrangement with precharge.

It is configured with an EMC filter, the CM jumper removed, no dynamic braking, and an enhanced local operator interface.

The embedded EtherNet/IP capability makes the drive suitable for integration into centralized industrial automation systems.

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2. Brand and Series

Item	Specification
Brand	Allen-Bradley
Product Family	PowerFlex 750-Series
Product Series	PowerFlex 755
Product Type	Air-Cooled AC Drive
Catalog Number	20G1AJD485AN4NNNNN
Drive Style	Packaged AC Drive
Cooling Method	Forced Air
Frame Size	Frame 8
Input Voltage	480 VAC
Input Phase	3 Phase
Rated Output 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 Operator Interface	Enhanced LCD Full Numeric HIM
HIM Enclosure Capability	IP66 / NEMA Type 4X/12 class
Communication	Embedded EtherNet/IP
Mounting	Floor Standing
Main Application	Large Industrial Motor Control

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3. Product Positioning

The 20G1AJD485AN4NNNNN is positioned in the high-power section of the PowerFlex 755 product range.

It is intended for applications where the motor is considerably larger than the typical compact-drive range.

A 485 A drive is appropriate for large pumps, fans, blowers, conveyors, material-handling systems, process machinery, mining equipment, cement equipment, water-treatment systems, and other high-power industrial loads.

The drive is particularly useful where the motor needs controlled acceleration, adjustable speed, networked control, operating diagnostics, and a robust industrial cabinet arrangement.

The Frame 8 construction also makes it suitable for centralized electrical rooms and large motor-control installations.

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4. Main Technical Specifications

Parameter	Specification
Catalog Number	20G1AJD485AN4NNNNN
Brand	Allen-Bradley
Product Family	PowerFlex 750-Series
Series	PowerFlex 755
Product Type	Air-Cooled AC Drive
Input Voltage	480 VAC
Input Phase	3 Phase
Rated Current	485 A
Light-Duty Power	450 HP
Normal-Duty Power	400 HP
Heavy-Duty Power	350 HP
Frame	Frame 8
Cooling	Forced Air
Enclosure	IP54
NEMA Rating	Type 12
Cabinet Style	800 mm Deep MCC Style
Input Type	AC Input with Precharge
DC Terminals	None
EMC Filter	Yes
CM Jumper	Removed
Dynamic Braking	None
HIM	Enhanced LCD Full Numeric
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
Main Applications	Pumps, fans, blowers, conveyors, process machinery
Duty Classes	Light Duty / Normal Duty / Heavy Duty

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5. Electrical Characteristics

The principal electrical rating of the 20G1AJD485AN4NNNNN is 485 A.

The drive is designed for a 480 VAC three-phase industrial supply.

The actual motor horsepower supported by the drive depends on the selected duty classification.

This is important because industrial motors do not all experience the same operating conditions.

A centrifugal pump, for example, may have relatively predictable torque characteristics, while a conveyor or crusher may require significantly greater overload capability during acceleration or abnormal loading.

The PowerFlex 755 configuration therefore provides separate Light-Duty, Normal-Duty, and Heavy-Duty ratings.

Duty Classification	Continuous Current	1-Minute Current	3-Second Current	Approx. Motor Rating
Light Duty	485 A	534 A	—	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 motor horsepower.

Normal-Duty and Heavy-Duty operation provide greater overload capability relative to the continuous rating, making those classifications more suitable for machines with more demanding load profiles.

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6. Light-Duty Application

The drive can support approximately 450 HP under Light-Duty conditions.

This makes it particularly attractive for large variable-torque equipment.

Typical examples include:

• Large centrifugal pumps.
• Cooling-water pumps.
• Industrial ventilation fans.
• Large process fans.
• Large blowers.
• Water-transfer systems.
• Utility pumping equipment.

Variable-speed operation can allow the motor to run at a speed that more closely matches the actual process requirement.

For suitable pump and fan applications, this can reduce unnecessary operation at maximum speed.

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7. Normal-Duty Application

Under Normal-Duty conditions, the drive is suitable for motors up to approximately 400 HP.

Normal-Duty operation is appropriate for applications with moderate overload requirements.

Potential applications include:

• Industrial pumps.
• Conveyors.
• Blowers.
• Process machinery.
• Material-transfer systems.
• General industrial equipment.

The Normal-Duty rating is often useful for machinery that operates continuously but experiences occasional increases in load.

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8. Heavy-Duty Application

For Heavy-Duty applications, the drive is rated at approximately 350 HP.

Heavy-Duty selection is appropriate when the machine experiences demanding acceleration or higher mechanical loading.

Potential applications include:

• Heavy conveyors.
• High-inertia machines.
• Mixers.
• Crushers.
• Material-handling systems.
• Process machinery with high starting torque.
• Machines with frequent acceleration cycles.

For these applications, the actual motor full-load current and overload profile should be checked rather than selecting the drive purely according to horsepower.

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9. Frame 8 Construction

The 20G1AJD485AN4NNNNN uses a Frame 8 construction.

This is a large floor-standing industrial drive.

The Frame 8 configuration provides the physical space required for:

• High-power switching components.
• DC-bus components.
• Cooling equipment.
• Power connections.
• Control electronics.
• Protection components.
• Service access.

The physical size is substantially larger than compact PowerFlex drive families.

This should be considered when planning the electrical room, transportation route, floor loading, cable entry, ventilation, and maintenance area.

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10. Dimensions and Weight

Mechanical Parameter	Specification
Catalog Number	20G1AJD485AN4NNNNN
Frame Size	Frame 8
Approx. Height	2477 mm
Approx. Width	600 mm
Approx. Depth	800 mm
Cabinet Depth	800 mm
Cabinet Style	MCC Style
Enclosure	IP54
NEMA Rating	Type 12
Approx. Equipment Weight	644 kg
Weight Unit	kg
Mounting	Floor Standing
Cooling	Forced Air
Installation Type	Industrial Electrical Room

The approximately 2477 × 600 × 800 mm dimensions and approximately 644 kg weight are suitable for preliminary layout and handling calculations.

For final installation work, the exact mechanical drawing and configured-unit documentation should be used.

The large weight means that transportation and installation should be planned in advance.

Floor loading, lifting points, forklifts, rigging equipment, access doors, and service clearances all need to be considered.

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11. IP54 / NEMA Type 12 Enclosure

The drive is configured in an IP54 / NEMA Type 12 enclosure.

This provides a significantly more protected arrangement than an open-frame industrial drive.

It is well suited to many indoor industrial installations.

Typical locations include:

• Electrical rooms.
• Motor-control rooms.
• Factory utility rooms.
• Pump stations.
• Water-treatment facilities.
• Manufacturing plants.
• Mining facilities.
• Cement plants.
• Process plants.

The enclosure should still be protected from excessive moisture, corrosive gases, conductive dust, chemical contamination, and temperatures outside the specified operating range.

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12. Air-Cooled Design

The drive uses forced-air cooling.

At a 485 A rating, the amount of electrical power processed by the drive is substantial.

The power components generate heat during operation, and the cooling system is responsible for removing that heat.

The installation therefore needs adequate airflow.

The electrical room should be evaluated for total heat generation when multiple drives are installed.

Airflow paths should remain unobstructed.

Cooling fans should be inspected during preventive maintenance.

Accumulated dust, restricted airflow, high ambient temperature, or fan failure can increase thermal stress on the drive.

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13. AC Input with Precharge

The 20G1AJD485AN4NNNNN uses an AC input with precharge.

Large variable-frequency drives contain substantial DC-bus capacitance.

When the drive is energized, the DC bus must be charged in a controlled manner.

The precharge arrangement helps control the initial charging current.

This is particularly important for a large Frame 8 drive.

The incoming electrical system should therefore be designed with appropriate:

• Disconnect equipment.
• Short-circuit protection.
• Input protection.
• Grounding.
• Power conductors.
• Switching equipment.
• Coordination with upstream equipment.

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14. EMC Filter

An EMC filter is included in this configuration.

Electromagnetic compatibility is an important consideration in high-power VFD installations.

The high-frequency switching action of the drive can produce electrical noise.

Proper filtering helps control conducted electromagnetic interference.

However, filter performance depends on the complete installation.

The following should also be considered:

• Motor cable construction.
• Cable length.
• Shielding.
• Grounding.
• Cable routing.
• Separation between power and control wiring.
• Cabinet layout.
• Communication cable routing.

For large industrial systems, EMC design should be considered during the original engineering stage rather than added after commissioning.

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15. CM Jumper Configuration

The catalog configuration uses the CM jumper removed arrangement.

This is related to common-mode and grounding behavior within the drive.

The configuration should be consistent with the overall electrical installation.

Grounding, EMC filtering, motor cable construction, and common-mode behavior should be considered together.

The configuration should not be changed without evaluating the electrical system and the requirements of the installation.

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16. Dynamic Braking

The 20G1AJD485AN4NNNNN is configured with no dynamic braking.

This is important when applying the drive to high-inertia equipment.

During deceleration, a motor can return mechanical energy to the drive.

The returned energy can increase the DC-bus voltage.

Applications with frequent or rapid deceleration therefore require additional engineering consideration.

Examples include:

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

If the application has substantial regenerative energy, an appropriate braking or regenerative-energy solution should be evaluated.

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17. Enhanced LCD Full Numeric HIM

One of the important differences between the AN4 and AN0 configurations is the local operator interface.

The 20G1AJD485AN4NNNNN is configured with an Enhanced LCD Full Numeric HIM.

This provides a convenient local interface for:

• Commissioning.
• Parameter adjustment.
• Drive status monitoring.
• Fault inspection.
• Alarm review.
• Diagnostic work.
• Local troubleshooting.
• Maintenance.

For large industrial installations, a local interface can be particularly valuable.

A technician working at the drive can inspect operating conditions without relying entirely on the plant control system.

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18. Embedded EtherNet/IP

The drive includes embedded EtherNet/IP communication.

This allows the drive to be incorporated into a larger industrial automation network.

A typical architecture can be represented as:

PLC → EtherNet/IP Network → PowerFlex 755 → Motor

The automation system can exchange information such as:

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

This is particularly useful when a plant contains multiple large drives.

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19. Local and Remote Control

The combination of the local HIM and embedded EtherNet/IP provides two practical operating approaches.

The drive can be commissioned and serviced locally.

At the same time, the plant automation system can monitor and control the drive through the network.

This combination is valuable in process plants where the drive is normally operated remotely but still needs local access during commissioning and maintenance.

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20. Main Product Applications

20.1 Large Water Pumps

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

Typical applications include:

• Raw-water pumping.
• Water-transfer systems.
• Booster stations.
• Cooling-water pumps.
• Process-water pumps.
• Industrial circulation pumps.
• Large utility pumps.

The drive allows pump speed to be adjusted according to process requirements.

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20.2 Wastewater Treatment

Wastewater plants frequently use large motors.

Potential applications include:

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

The high-power rating makes the drive suitable for large pumping and blower equipment.

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20.3 Large Industrial Fans

Large fans can require hundreds of horsepower.

Applications include:

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

Variable-speed operation allows airflow to be adjusted according to process demand.

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20.4 Large Blowers

Industrial blowers are widely used in process industries.

Applications include:

• Aeration.
• Pneumatic conveying.
• Process air.
• Combustion air.
• Ventilation.
• Industrial drying.

The drive can regulate blower speed and provide operating information to the central automation system.

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20.5 Conveyor Systems

Large conveyors can have considerable mechanical inertia.

The drive can provide controlled acceleration and deceleration.

This can reduce mechanical shock on:

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

The application should be checked carefully for braking requirements, especially when the conveyor has significant downhill sections or high inertia.

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21. Mining Applications

Mining systems frequently require large motors.

Potential applications include:

• Ore conveyors.
• Bulk-material conveyors.
• Dewatering pumps.
• Ventilation fans.
• Process pumps.
• Material-handling equipment.

The Frame 8 design is suitable for centralized electrical installations where large motor-control equipment is grouped in an electrical room.

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22. Cement and Aggregate Applications

Cement and aggregate plants contain many high-power motor loads.

The drive can be considered for:

• Conveyors.
• Large fans.
• Process pumps.
• Blowers.
• Material-handling equipment.
• Cooling equipment.
• Auxiliary machinery.

Network communication is particularly useful when many drives need to be coordinated through a central control system.

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23. Steel and Metal Processing

Steel and metal-processing plants often use large motors for continuous processes.

Potential applications include:

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

The high current rating gives the drive sufficient capacity for a broad range of large motor applications.

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24. Process Industry Applications

The PowerFlex 755 platform can also be applied to large process machinery.

Examples include:

• Chemical-process pumps.
• Circulation pumps.
• Large blowers.
• Process fans.
• Material-transfer systems.
• Utility equipment.

The embedded network interface makes it possible to incorporate drive operation into the larger process-control architecture.

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25. Advantages of the 20G1AJD485AN4NNNNN

25.1 High 485 A Current Rating

The most obvious advantage is its 485 A current capacity.

This places the drive in the high-power industrial category.

It can control large motors without requiring multiple smaller VFDs to perform the same function.

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25.2 450 HP Light-Duty Capability

The 450 HP Light-Duty rating makes this drive particularly useful for large variable-torque loads.

Large pumps and fans are common examples.

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25.3 400 HP Normal-Duty Capability

The 400 HP Normal-Duty rating provides a strong option for general industrial equipment.

It is useful for machinery that experiences moderate overload conditions.

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25.4 350 HP Heavy-Duty Capability

The 350 HP Heavy-Duty rating provides a practical option for demanding mechanical loads.

This makes the drive more versatile than a product designed only for variable-torque applications.

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25.5 Frame 8 Industrial Construction

The Frame 8 format provides a robust floor-standing platform for large electrical systems.

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25.6 IP54 / NEMA Type 12 Protection

The enclosure is appropriate for many indoor industrial environments.

It provides more environmental protection than an open-frame drive.

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25.7 Enhanced Local Operator Interface

The AN4 configuration provides an enhanced local HIM.

This is useful for:

• Commissioning.
• Maintenance.
• Parameter adjustment.
• Troubleshooting.
• Local status monitoring.

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25.8 Embedded EtherNet/IP

Integrated communication reduces the need for additional external communication hardware for basic network integration.

It allows the drive to become part of a larger automation system.

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25.9 EMC Filter

The integrated EMC filtering supports better electromagnetic compatibility when combined with correct grounding and cable practices.

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25.10 Flexible Duty Selection

The Light-Duty, Normal-Duty, and Heavy-Duty ratings provide flexibility when matching the drive to different load profiles.

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26. Comparison with 20G1AJD485AN0NNNNN

The 20G1AJD485AN4NNNNN and 20G1AJD485AN0NNNNN share the same fundamental high-power electrical platform.

The primary difference is the local operator-interface configuration.

Parameter	20G1AJD485AN0NNNNN	20G1AJD485AN4NNNNN
Voltage	480 VAC	480 VAC
Current	485 A	485 A
Light Duty	450 HP	450 HP
Normal Duty	400 HP	400 HP
Heavy Duty	350 HP	350 HP
Frame	8	8
Enclosure	IP54 / Type 12	IP54 / Type 12
Cabinet Depth	800 mm	800 mm
Cooling	Forced Air	Forced Air
EMC Filter	Yes	Yes
CM Jumper	Removed	Removed
Dynamic Braking	None	None
EtherNet/IP	Embedded	Embedded
HIM	None / Blank	Enhanced LCD Full Numeric
Main Difference	No local HIM	Enhanced local HIM

For installations where local operation and commissioning are important, the AN4 configuration is generally the more convenient arrangement.

For fully centralized systems where local operator access is not required, the AN0 configuration can be a more appropriate configuration.

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27. Five Recommended Same-Series or Closely Related Models

The following five models are closely related to the 20G1AJD485AN4NNNNN and are useful when comparing current capacity and motor-power requirements.

Model	Voltage	Current	Light Duty	Normal Duty	Heavy Duty	Frame	Enclosure
20G1AJD430AN4NNNNN	480 VAC	430 A	400 HP	350 HP	300 HP	8	IP54 / Type 12
20G1AJD545AN4NNNNN	480 VAC	545 A	500 HP	450 HP	350 HP	8	IP54 / Type 12
20G1AJD617AN4NNNNN	480 VAC	617 A	600 HP	500 HP	400 HP	8	IP54 / Type 12
20G1AJD710AN4NNNNN	480 VAC	710 A	650 HP	600 HP	450 HP	8	IP54 / Type 12
20G1AJD740AN4NNNNN	480 VAC	740 A	700 HP	650 HP	500 HP	8	IP54 / Type 12

These models form a useful progression around the 485 A configuration.

The 430 A model is the lower-capacity alternative.

The 545 A, 617 A, 710 A, and 740 A models provide progressively greater current and motor-power capability.

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28. Detailed Related-Model Comparison

Model	Rated Current	LD Rating	ND Rating	HD Rating	Frame	Typical Position
20G1AJD430AN4NNNNN	430 A	400 HP	350 HP	300 HP	8	Lower capacity
20G1AJD485AN4NNNNN	485 A	450 HP	400 HP	350 HP	8	Main model
20G1AJD545AN4NNNNN	545 A	500 HP	450 HP	350 HP	8	Higher capacity
20G1AJD617AN4NNNNN	617 A	600 HP	500 HP	400 HP	8	Very high power
20G1AJD710AN4NNNNN	710 A	650 HP	600 HP	450 HP	8	Extremely high power
20G1AJD740AN4NNNNN	740 A	700 HP	650 HP	500 HP	8	Highest capacity in this group

This range makes it easier to match the drive to the actual motor current.

If the application is near the upper current limit of the 485 A configuration, the next higher current model should be evaluated.

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29. Mechanical Comparison of Related Models

Model	Frame	Approx. Height	Approx. Width	Approx. Depth	Approx. Weight
20G1AJD430AN4NNNNN	8	2477 mm	600 mm	800 mm	Approx. 644 kg
20G1AJD485AN4NNNNN	8	2477 mm	600 mm	800 mm	Approx. 644 kg
20G1AJD545AN4NNNNN	8	2477 mm	600 mm	800 mm	Approx. 644 kg
20G1AJD617AN4NNNNN	8	2477 mm	600 mm	800 mm	Approx. 644 kg
20G1AJD710AN4NNNNN	8	2477 mm	600 mm	800 mm	Approx. 644 kg
20G1AJD740AN4NNNNN	8	2477 mm	600 mm	800 mm	Approx. 644 kg

These mechanical values are suitable for preliminary planning.

Exact cabinet dimensions, shipping dimensions, and final weight should be confirmed against the mechanical documentation for the specific configuration before construction or transportation.

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30. Five Broader Allen-Bradley Model Recommendations

For comparison outside the immediate 480 V Frame 8 group, the following models represent other widely used PowerFlex configurations and smaller drive families.

Model	Series	Voltage Class	Capacity	Frame / Format	Typical Application
25B-D030N114	PowerFlex 525	480 VAC Class	30 HP class	Compact	Pumps, fans, conveyors
25C-D030N114	PowerFlex 523	480 VAC Class	30 HP class	Compact	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 are not direct replacements for the 20G1AJD485AN4NNNNN.

They are included as broader product-family alternatives for projects with different motor sizes, voltage requirements, installation formats, or power levels.

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31. Broader Model Parameter Comparison

Model	Product Series	Voltage	Current / Capacity	Frame	Enclosure / Format	Typical Use
25B-D030N114	PowerFlex 525	480 VAC class	30 HP class	Compact	Compact industrial drive	Pumps, fans, conveyors
25C-D030N114	PowerFlex 523	480 VAC class	30 HP class	Compact	Compact industrial drive	General machinery
20G1AGE053JA0NNNNN	PowerFlex 755	600 VAC	53 A	6	IP54 / Type 12 class	Process equipment
20G1AGC260JN0NNNNN	PowerFlex 755	400 VAC	260 A	7	IP54 / Type 12 class	Pumps, conveyors
20G1AND302JA0NNNNN	PowerFlex 755	480 VAC class	302 A	7	Open/IP20 class	Industrial motor control

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32. Why the PowerFlex 755 Platform Is Suitable for Large Motors

Large motors require more than simple frequency conversion.

The drive must handle:

• High current.
• Large DC-bus energy.
• Motor acceleration.
• Motor deceleration.
• Thermal management.
• Electrical noise.
• Grounding.
• Communication.
• Fault handling.
• Maintenance.

The PowerFlex 755 architecture addresses these requirements with a large industrial platform.

The Frame 8 construction of the 20G1AJD485AN4NNNNN is particularly suitable for centralized high-power installations.

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33. Pump Application Advantages

When used with a large pump, the drive can provide controlled acceleration and adjustable operating speed.

This can help avoid abrupt mechanical loading during startup.

Speed control can also allow the pump to respond to changing process demand.

Typical benefits include:

• Controlled startup.
• Adjustable flow.
• Adjustable pressure.
• Reduced mechanical shock.
• Centralized monitoring.
• Network-based control.
• Fault reporting.

For variable-torque applications, the Light-Duty rating can provide a high motor-power range.

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34. Conveyor Application Advantages

For conveyors, controlled acceleration is often more important than simple speed adjustment.

A conveyor can contain substantial mechanical inertia.

The drive can progressively increase motor speed.

This can reduce stress on mechanical components and help prevent abrupt belt loading.

The drive can also communicate with the larger automation system.

This allows conveyor status, faults, current, and speed to become part of the plant-control system.

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35. Fan and Blower Application Advantages

Large fans and blowers frequently operate under changing process conditions.

The drive can adjust motor speed to match the required airflow.

Potential benefits include:

• Improved process control.
• Smooth acceleration.
• Adjustable operating speed.
• Centralized monitoring.
• Reduced unnecessary full-speed operation.

The 450 HP Light-Duty rating makes this configuration particularly attractive for large variable-torque fan and blower applications.

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36. Water Treatment Application

Water-treatment facilities often contain several large pumps.

The 20G1AJD485AN4NNNNN can be applied to:

• Intake pumps.
• Transfer pumps.
• Booster pumps.
• Process pumps.
• Cooling pumps.
• Aeration blowers.

The embedded EtherNet/IP capability allows the drive to be integrated into the facility’s control architecture.

The local HIM is also useful during commissioning and maintenance.

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37. Mining Application

Mining equipment can impose demanding operating conditions.

Large motors may drive:

• Conveyors.
• Pumps.
• Fans.
• Material-handling equipment.
• Processing machinery.

The drive’s high current capacity makes it suitable for large motor applications when the environmental and duty requirements are properly evaluated.

The IP54 / NEMA Type 12 enclosure is useful for controlled indoor electrical installations, while the actual mining environment should always be evaluated independently.

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38. Cement Plant Application

Cement plants contain large rotating machinery and extensive material-handling systems.

Potential uses include:

• Raw-material conveyors.
• Large process fans.
• Cooling systems.
• Process pumps.
• Blowers.
• Material-transfer equipment.

The drive’s network communication is useful when several motors need to operate as part of a coordinated process.

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39. Steel Plant Application

Steel facilities often have continuous motor loads.

The drive can be considered for:

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

The high current capacity and industrial cabinet design make it suitable for large centralized motor-control systems.

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40. Maintenance and Service Considerations

Because the drive is a large Frame 8 system, preventive maintenance is important.

Recommended maintenance areas include:

• Cooling fans.
• Airflow passages.
• Cabinet cleanliness.
• Power connections.
• Grounding connections.
• Motor cables.
• Communication wiring.
• Environmental conditions.
• Alarm history.
• Fault history.
• Operating temperature.
• Ventilation system.
• Signs of overheating.

The local Enhanced LCD Full Numeric HIM can simplify many maintenance tasks because technicians can inspect operating information directly at the drive.

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41. Installation Considerations

The physical size and weight should be considered early in the project.

The approximate dimensions are:

2477 mm high × 600 mm wide × 800 mm deep

The approximate weight is:

644 kg

This means the installation team should verify:

• Floor loading.
• Access-door dimensions.
• Transportation route.
• Lifting equipment.
• Forklift capacity.
• Rigging points.
• Service clearance.
• Cable entry.
• Ventilation.
• Cabinet access.

The height should also be checked against ceiling and transportation clearances.

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42. Electrical Installation Considerations

Before commissioning the drive, the following should be reviewed:

Engineering Item	What to Check
Incoming Voltage	480 VAC three-phase system
Motor Voltage	Compatible with drive output
Motor Current	Within selected duty rating
Motor HP	LD / ND / HD rating
Load Type	Variable torque / constant torque
Acceleration	Required acceleration time
Deceleration	Required stopping time
Regeneration	Possible returned energy
Braking	Need for braking solution
Grounding	Proper grounding arrangement
EMC	Cable routing and filtering
Cooling	Adequate airflow
Environment	Temperature, dust, humidity
Network	EtherNet/IP architecture
Local Interface	HIM requirements
Cabinet Space	Approximately 2477 × 600 × 800 mm
Weight	Approximately 644 kg
Maintenance	Adequate access

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43. Advantages of the AN4 Configuration

The AN4 configuration is particularly useful where local access is required.

The Enhanced LCD Full Numeric HIM provides a practical interface for technicians.

This is valuable during:

• Initial commissioning.
• Motor identification.
• Parameter setup.
• Fault investigation.
• Maintenance.
• Local status checks.
• Troubleshooting.

The drive can still be integrated into a centralized automation system through EtherNet/IP.

This combination of local and remote access is one of the practical advantages of this configuration.

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44. Overall Product Strengths

Strength	Description
High Current	485 A
High Power	Up to 450 HP LD
Strong Normal Duty	Up to 400 HP ND
Heavy-Duty Capability	Up to 350 HP HD
Industrial Frame	Frame 8
Enclosure Protection	IP54 / NEMA Type 12
Local Interface	Enhanced LCD Full Numeric HIM
Networking	Embedded EtherNet/IP
Cooling	Forced Air
EMC	Integrated EMC Filter
Precharge	AC input with precharge
Flexible Applications	Pumps, fans, blowers, conveyors
Large-System Integration	Suitable for centralized automation
Serviceability	Local operating and diagnostic interface

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45. Product Selection Summary

The 20G1AJD485AN4NNNNN is particularly appropriate when the application has the following characteristics:

• 480 VAC three-phase supply.
• Large motor.
• Motor current approaching the 485 A class.
• High horsepower requirement.
• Industrial indoor installation.
• IP54 / Type 12 enclosure requirement.
• EtherNet/IP communication requirement.
• Local commissioning requirement.
• Large pump or fan.
• Large conveyor.
• Heavy industrial machinery.
• Process-control integration.

If the motor requirement is lower, the 430 A model may be sufficient.

If the motor current exceeds the practical range of the 485 A model, the 545 A, 617 A, 710 A, or 740 A models should be evaluated.

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46. Complete Product Parameter Table

Category	Detailed Specification
Brand	Allen-Bradley
Product Family	PowerFlex 750-Series
Product Series	PowerFlex 755
Catalog Number	20G1AJD485AN4NNNNN
Product Type	Air-Cooled AC Drive
Input Voltage	480 VAC
Input 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
AC Input	Yes
Precharge	Yes
DC Terminals	None
EMC Filter	Included
CM Jumper	Removed
Dynamic Braking	None
Local HIM	Enhanced LCD Full Numeric
HIM Protection Class	IP66 / NEMA Type 4X/12 class
Network	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
Main Load Types	Variable Torque / General Industrial / Heavy Industrial
Typical Applications	Pumps, fans, blowers, conveyors, mining, cement, steel, water treatment
Primary Advantage	High-power industrial motor control

47. Final Product Assessment

The Allen-Bradley 20G1AJD485AN4NNNNN is a high-power PowerFlex 755 AC drive intended for large industrial motor-control applications.

Its 485 A output rating, 480 VAC three-phase input class, and Frame 8 construction place it firmly in the large industrial-drive category.

The drive can support approximately 450 HP in Light-Duty applications, 400 HP in Normal-Duty applications, and 350 HP in Heavy-Duty applications.

This makes it suitable for a wide range of large motor applications rather than being limited to one particular type of machine.

For large centrifugal pumps, the Light-Duty rating provides substantial motor capacity and allows adjustable-speed operation.

For industrial conveyors and other constant-torque machinery, the Normal-Duty or Heavy-Duty ratings can be more relevant depending on the actual motor current and overload requirements.

The IP54 / NEMA Type 12 enclosure makes the drive suitable for many controlled industrial indoor environments.

The 800 mm deep MCC-style cabinet provides a practical high-power installation format, while the forced-air cooling system manages the thermal load generated during operation.

The Enhanced LCD Full Numeric HIM is one of the key characteristics of the AN4 configuration.

It provides technicians with a local interface for commissioning, parameter adjustment, monitoring, troubleshooting, and maintenance.

This is particularly useful for large Frame 8 installations where technicians may need direct access to the drive.

The embedded EtherNet/IP interface allows the drive to become part of a centralized automation system.

This makes it possible to exchange speed references, operating status, current information, fault information, alarms, and diagnostic data with the plant control system.

The combination of local HIM access and network communication makes the drive suitable for both centralized automation and local service requirements.

The approximate 2477 mm height, 600 mm width, 800 mm depth, and 644 kg weight should be considered during the early engineering stage.

The equipment is large and heavy enough that transportation, lifting, floor loading, electrical-room access, ventilation, and service clearance should all be planned before installation.

The 20G1AJD430AN4NNNNN is a logical lower-current alternative.

The 20G1AJD545AN4NNNNN, 20G1AJD617AN4NNNNN, 20G1AJD710AN4NNNNN, and 20G1AJD740AN4NNNNN provide progressively higher current and horsepower capability when the application requires a larger drive.

For broader applications, smaller PowerFlex families can be considered when the motor is significantly below the several-hundred-horsepower range.

Overall, the 20G1AJD485AN4NNNNN is best regarded as a large industrial motor-control platform designed for high-power applications where current capacity, adjustable-speed operation, local commissioning, industrial enclosure protection, and automation-network integration are all important.

Its strongest application areas include large pumps, water-treatment systems, wastewater equipment, industrial fans, blowers, mining conveyors, cement equipment, steel-processing auxiliary systems, material-handling equipment, and large process machinery.

For final selection, the motor nameplate current should always be compared against the appropriate duty classification.

Horsepower alone is not sufficient for final sizing.

The actual load profile, acceleration requirements, overload requirements, braking requirements, ambient conditions, enclosure requirements, cooling conditions, and network architecture should all be considered together.

For a properly engineered high-power motor-control system, the 20G1AJD485AN4NNNNN provides a strong combination of 485 A capacity, up to 450 HP Light-Duty operation, Frame 8 construction, IP54 / NEMA Type 12 protection, forced-air cooling, embedded EtherNet/IP, EMC filtering, AC-input precharge, and an enhanced local operator interface.