Company Information
E-mail		[email protected]
Mobile		+8615980777398
Whatsapp		+8615980777398
WeChat		15980777398

Allen-Bradley 20G1ALD485AN0NNNNN PowerFlex 755 AC Drive

1. Product Overview

The Allen-Bradley 20G1ALD485AN0NNNNN is a high-power PowerFlex 755 AC Drive designed for demanding industrial motor-control applications.

This model belongs to the large-frame, air-cooled PowerFlex 755 drive family and is intended for applications where a conventional compact variable-frequency drive does not provide sufficient current capacity, motor power capability, or system-level control functionality.

The drive is rated for 480 VAC, three-phase input power and provides a substantial 485 A output-current rating.

Its application ratings are approximately 450 HP for Low Duty, 400 HP for Normal Duty, and 350 HP for Heavy Duty.

The model uses a Frame 8 mechanical configuration and an 800 mm deep MCC-style construction, making it suitable for floor-standing industrial installations, electrical rooms, MCC systems, and large machine-control systems.

The drive also provides embedded EtherNet/IP communication, allowing it to be incorporated into a networked automation system.

The specified AN0 configuration is a no-HIM arrangement, making the unit suitable for centralized control architectures where the drive is operated and monitored through a PLC, HMI, supervisory system, or engineering workstation.

---

2. Brand and Product Series

Item	Specification
Brand	Allen-Bradley
Product Series	PowerFlex 755
Product Family	PowerFlex Air Cooled 755 AC Drive
Exact Model	20G1ALD485AN0NNNNN
Product Type	High-Power AC Variable Frequency Drive
Cooling	Forced Air
Frame	Frame 8
Input Voltage	480 VAC
Input Phase	3 Phase
Output Current	485 A
Low-Duty Rating	450 HP
Normal-Duty Rating	400 HP
Heavy-Duty Rating	350 HP
Enclosure	Type 1 / IP20
Installation Style	800 mm Deep MCC Style
Communication	Embedded EtherNet/IP
Input Configuration	AC Input with Precharge
DC Terminals	None
EMC Configuration	Filtered
CM Jumper	Configuration dependent; AN0 version uses the applicable factory configuration
Dynamic Braking	None
HIM	Blank / No HIM

---

3. Main Technical Parameters

Parameter	Specification
Model	20G1ALD485AN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product Type	AC Variable Frequency Drive
Input Voltage	480 VAC
Input Phase	3 Phase
Rated Output Current	485 A
Low-Duty Motor Rating	450 HP
Normal-Duty Motor Rating	400 HP
Heavy-Duty Motor Rating	350 HP
Low-Duty Approximate Metric Rating	336 kW
Normal-Duty Approximate Metric Rating	298 kW
Heavy-Duty Approximate Metric Rating	261 kW
Frame Size	Frame 8
Cooling	Forced Air
Enclosure	Type 1 / IP20
Installation Style	800 mm Deep MCC Style
Input Type	AC Input with Precharge
DC Terminals	None
EMC Filtering	Filtered
Dynamic Braking	None
Communication	Embedded EtherNet/IP
Local HIM	Blank / No HIM
Installation	Floor Standing
Approximate Width	About 600 mm*
Approximate Height	About 2,000–2,400 mm*
Depth	800 mm
Approximate Weight	About 500–650 kg*

*Dimensions and weight are preliminary planning values for a large Frame 8 installation. The complete physical arrangement can vary depending on the configured drive structure, cabinet construction, options, power components, cable compartments, and associated equipment. Final mechanical documentation should be used for fabrication, lifting, transportation, floor-loading calculations, and installation.

---

4. Electrical Rating

The 20G1ALD485AN0NNNNN is designed for a 480 VAC three-phase power system.

With an output-current rating of 485 A, this drive is intended for large industrial motors and substantial mechanical loads.

The 485 A rating provides a useful step above the 430 A configuration in the same general PowerFlex 755 family.

This additional current capacity can be important when the motor operates close to the upper range of a lower-current drive or when the application requires additional current capability for acceleration and load variations.

The actual motor nameplate current should always be considered when selecting the drive.

Motor horsepower alone is not sufficient because two motors with the same nominal horsepower can have different full-load currents depending on voltage, efficiency, power factor, construction, and operating conditions.

---

5. Motor Power Ratings

The drive provides three principal duty classifications.

Duty Classification	Power Rating	Approximate kW Equivalent
Low Duty	450 HP	Approximately 336 kW
Normal Duty	400 HP	Approximately 298 kW
Heavy Duty	350 HP	Approximately 261 kW

The 450 HP Low-Duty rating is intended for applications with relatively moderate overload requirements.

The 400 HP Normal-Duty rating is suitable for many general industrial applications where the motor operates under normal continuous loading conditions.

The 350 HP Heavy-Duty rating is intended for applications where higher overload capability is required.

The correct duty rating should be selected according to the actual load profile rather than simply the motor’s nominal horsepower.

---

6. Low-Duty Operation

The 450 HP Low-Duty rating gives the drive a high level of motor-power capability for applications with comparatively moderate overload requirements.

Typical examples include large pumps, fans, blowers, and other variable-torque machinery.

In these applications, the motor may operate continuously but does not necessarily experience frequent severe torque peaks.

For such applications, the Low-Duty rating can provide a practical way to utilize the available drive capacity.

---

7. Normal-Duty Operation

The 400 HP Normal-Duty rating is suitable for many general industrial applications.

Normal-Duty applications can include process pumps, conveyors, fans, blowers, material-handling systems, and other machinery with relatively predictable operating loads.

The motor’s actual full-load current should be compared with the applicable drive current rating.

Acceleration and deceleration requirements should also be reviewed before final selection.

---

8. Heavy-Duty Operation

The 350 HP Heavy-Duty rating is important for applications where the motor may experience substantial overload or higher starting torque requirements.

Typical examples can include:

• Conveyors.
• Mixers.
• Crushers.
• Material-handling systems.
• High-inertia machinery.
• Process equipment.
• Machinery with frequent acceleration.

A Heavy-Duty application may require a lower nominal motor horsepower than the Low-Duty rating because the drive must reserve more electrical capacity for overload conditions.

---

9. 485 A Output Current

The 485 A output rating is one of the defining characteristics of this model.

A drive in this current class is intended for large industrial motors.

The high output-current capacity makes the unit suitable for machinery requiring substantial motor torque and high starting or operating current.

This is particularly useful in applications where the motor is directly coupled to a large mechanical load.

The 485 A rating also gives engineers additional selection flexibility when comparing the model with nearby PowerFlex 755 current ratings.

---

10. 480 VAC Three-Phase Input

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

This voltage class is common in large industrial plants.

Typical facilities include:

• Manufacturing plants.
• Process factories.
• Water-treatment facilities.
• Mining installations.
• Cement plants.
• Material-handling facilities.
• Large commercial or industrial ventilation systems.
• Pulp and paper plants.

Before installation, the actual incoming facility voltage should be verified.

Transformer configuration, voltage tolerance, grounding arrangement, protective devices, and short-circuit characteristics should also be evaluated as part of the electrical design.

---

11. Air-Cooled Design

The 20G1ALD485AN0NNNNN uses forced-air cooling.

High-power drives generate significant heat during normal operation.

The cooling system moves air through the drive’s power section to remove heat generated by the power electronics.

Adequate airflow is therefore essential.

The installation should provide suitable air intake and exhaust paths.

The drive should not be installed where surrounding equipment blocks the cooling airflow.

The electrical room’s HVAC system should also be designed with the drive’s heat output in mind.

---

12. Frame 8 Construction

The Frame 8 configuration places the drive in the large industrial equipment category.

The physical size is substantially greater than that of compact variable-frequency drives.

The Frame 8 construction should be considered when designing:

• Electrical rooms.
• MCC sections.
• Drive cabinets.
• Cable compartments.
• Maintenance areas.
• Transportation routes.
• Lifting systems.
• Floor loading.
• Ventilation systems.

The large mechanical size also means that installation planning should begin before the drive is delivered to the site.

---

13. 800 mm Deep MCC-Style Construction

The model uses an 800 mm deep MCC-style configuration.

The 800 mm depth is an important mechanical design consideration.

It affects:

• Cabinet depth.
• Cable entry.
• Cable bending radius.
• Busbar arrangement.
• Maintenance access.
• Ventilation.
• Rear clearance.
• Door arrangement.
• Equipment transportation.

The final cabinet layout may require more total space than the nominal 800 mm drive depth because additional cable compartments, incoming protection, busbars, disconnects, or other equipment may be installed alongside the drive.

---

14. Type 1 / IP20 Enclosure

The drive uses a Type 1 / IP20 class configuration.

This type of protection is intended for an appropriate protected industrial electrical environment.

It should not be treated as a sealed outdoor enclosure.

The installation area should therefore be protected from:

• Direct water.
• Excessive moisture.
• Condensation.
• Conductive dust.
• Corrosive chemicals.
• Excessive airborne contamination.
• Extreme environmental conditions.

If the drive must operate in a harsher environment, the complete cabinet and room design should provide the necessary additional protection.

---

15. Embedded EtherNet/IP

The 20G1ALD485AN0NNNNN includes embedded EtherNet/IP communication.

This makes it suitable for integration into a modern industrial automation architecture.

Instead of operating as an isolated speed controller, the drive can communicate with the plant control system.

Typical data exchanged through the network can include:

• Start command.
• Stop command.
• Speed reference.
• Frequency reference.
• Actual speed.
• Motor current.
• Drive status.
• Fault information.
• Alarm information.
• Diagnostic information.
• Operating state.

This can significantly simplify centralized monitoring and control when a facility contains multiple large motor drives.

---

16. No-HIM Configuration

The model uses a Blank / No HIM configuration.

The absence of a permanent local HIM is useful when the drive is intended to operate as part of a centralized control architecture.

For example, a large drive may be installed inside an electrical room while the operator interacts with the system from a remote HMI.

The PLC can issue commands and monitor the drive over the industrial network.

This arrangement is particularly practical in automated plants where operators do not need to stand directly in front of each drive.

For applications requiring frequent local adjustment, a related HIM-equipped configuration can be considered.

---

17. AC Input With Precharge

The model uses AC input with precharge.

The precharge arrangement controls the initial charging of the drive’s internal DC-link capacitors.

This is important for high-power drives because directly connecting a large capacitor bank to the incoming supply can create a substantial initial inrush current.

The precharge system provides a controlled energization sequence.

This is an important part of the drive’s overall power architecture.

---

18. No DC Terminals

The specified model has no DC terminals.

This identifies it as an AC-input configuration without externally accessible DC terminals for a common DC-bus arrangement.

This characteristic should be considered if the project involves:

• Shared DC bus systems.
• Regenerative drives.
• Common DC-link applications.
• External braking systems.
• Multi-drive energy sharing.

If a project requires external DC-bus connections, a different configuration may be required.

---

19. EMC Filtering

The model is configured with EMC filtering.

Electromagnetic compatibility is important in any variable-frequency drive installation.

The drive’s switching devices operate at high speed and can produce high-frequency electrical components.

The EMC performance of the complete installation depends on:

• Drive filtering.
• Motor cable construction.
• Cable shielding.
• Grounding.
• Cabinet bonding.
• Cable routing.
• Control cable separation.
• Communication cable routing.
• Motor grounding.

The drive’s EMC configuration should therefore be considered together with the complete electrical installation.

---

20. Dynamic Braking

The specified configuration has no dynamic braking.

This is an important consideration for applications with high inertia or rapid stopping requirements.

During motor deceleration, mechanical energy can be transferred back toward the drive.

Depending on the application, this energy may need to be dissipated or returned to the electrical system.

Applications requiring additional braking analysis include:

• Large conveyors.
• High-inertia fans.
• Centrifuges.
• Large rotating equipment.
• Vertical machinery.
• Hoisting systems.
• Rapid-stop process equipment.

The required deceleration time should be calculated before finalizing the drive configuration.

---

21. Product Introduction

The PowerFlex 755 platform is designed for industrial motor-control systems where high power, flexible control, network integration, and diagnostics are required.

The 20G1ALD485AN0NNNNN is positioned in the large-frame portion of the family.

Its 485 A current rating makes it suitable for motors substantially larger than those normally controlled by compact machine drives.

The drive is especially useful when the motor-control system needs to communicate with a PLC or plant automation network.

Its large-frame mechanical construction also makes it suitable for floor-standing industrial installations.

---

22. Typical Applications

Large Pumps

Large industrial pumps are one of the most suitable application categories for this type of drive.

Applications can include:

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

Variable-speed operation allows the pump output to be adjusted according to process requirements.

---

Water and Wastewater

Water-treatment facilities often use large motors for pumping and ventilation.

The drive can be applied to:

• Raw-water pumps.
• Transfer pumps.
• Booster pumps.
• Process pumps.
• Aeration equipment.
• Large ventilation systems.

Embedded network communication is useful when multiple drives are integrated into a centralized plant-control system.

---

Fans

Large fans can require substantial motor power.

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

Potential applications include:

• Industrial ventilation.
• Furnace systems.
• Exhaust systems.
• Dust collection.
• Combustion air.
• Process cooling.
• Air handling.

---

Blowers

Industrial blowers may operate continuously but at different process conditions.

The drive can provide variable-speed control and allow the blower motor to operate according to process demand.

This is useful in:

• Wastewater aeration.
• Industrial air systems.
• Combustion systems.
• Pneumatic processes.
• Process ventilation.

---

Conveyors

Large conveyor systems can require substantial motor torque.

The drive can provide controlled acceleration and speed regulation.

Potential applications include:

• Mining conveyors.
• Cement conveyors.
• Aggregate handling.
• Bulk material handling.
• Port equipment.
• Manufacturing systems.

The motor current and acceleration requirements should be reviewed carefully before selecting the final duty rating.

---

Mining

Mining applications frequently involve large motors and demanding load conditions.

Possible applications include:

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

The drive’s large current capacity makes it suitable for large motors, but the environmental conditions and mechanical load profile must also be considered.

---

Cement and Aggregate

Cement and aggregate plants use many large rotating machines.

Typical equipment includes:

• Conveyors.
• Fans.
• Pumps.
• Crushers.
• Material-handling systems.
• Processing machinery.

The drive can be incorporated into a plant-wide automation system using industrial network communication.

---

Pulp and Paper

Large pulp and paper facilities use variable-speed motors throughout their processes.

Potential applications include:

• Pumps.
• Fans.
• Rollers.
• Conveyors.
• Process machinery.
• Material handling.

The network capability is useful for coordinated monitoring and control.

---

Chemical and Process Industries

Process plants often use large motors for pumps, fans, blowers, mixers, and other equipment.

The drive can be integrated with the process control system to provide centralized monitoring and motor-speed control.

---

23. Major Product Advantages

High 485 A Current Rating

The 485 A output rating provides substantial capacity for large industrial motors.

It is suitable for applications where a smaller drive would not provide enough current.

---

Up to 450 HP Low-Duty Capacity

The 450 HP Low-Duty rating gives the drive a high motor-power capability.

This makes it suitable for large variable-speed machinery.

---

400 HP Normal-Duty Capability

The 400 HP Normal-Duty rating covers a broad range of large industrial applications.

This can include pumps, fans, conveyors, blowers, and process equipment.

---

350 HP Heavy-Duty Capability

The Heavy-Duty rating allows the drive to be used with applications requiring higher overload performance.

This can be important for constant-torque and high-inertia equipment.

---

Embedded EtherNet/IP

Integrated industrial Ethernet communication allows the drive to become part of a larger automation system.

This reduces the need to treat the drive as a standalone device.

---

Large Frame 8 Construction

The Frame 8 architecture provides a physical platform suitable for high-power installations.

---

Forced-Air Cooling

The forced-air system provides a practical cooling method for high-power continuous-duty applications.

---

No-HIM Configuration

The no-HIM arrangement is well suited to centralized control systems.

---

Broad Industrial Application Range

The drive can be used in many industries, including:

• Manufacturing.
• Water treatment.
• Mining.
• Cement.
• Pulp and paper.
• Chemical processing.
• Material handling.
• Industrial ventilation.

---

24. Five Same-Series or Closely Related Models

The following models are closely related PowerFlex 755 configurations that can be considered when comparing current rating, power capacity, and operator-interface configuration.

Model	Series	Voltage	Current	LD Rating	ND Rating	HD Rating	HIM
20G1ALD430AN0NNNNN	PowerFlex 755	480 VAC	430 A	400 HP	350 HP	300 HP	No HIM
20G1ALD485JN0NNNNN	PowerFlex 755	480 VAC	485 A	450 HP	400 HP	350 HP	No HIM
20G1ALD485JN2NNNNN	PowerFlex 755	480 VAC	485 A	450 HP	400 HP	350 HP	HIM
20G1ALD485JN4NNNNN	PowerFlex 755	480 VAC	485 A	450 HP	400 HP	350 HP	Enhanced HIM
20G1ALD545AN0NNNNN	PowerFlex 755	480 VAC	545 A	500 HP	450 HP	350 HP	No HIM

The closest electrical comparison is the 485 A JN0 configuration, while the JN2 and JN4 versions provide alternative local interface arrangements.

---

25. Related Model: 20G1ALD430AN0NNNNN

The 20G1ALD430AN0NNNNN is a lower-current configuration within the same general 480 VAC PowerFlex 755 family.

Parameter	Specification
Model	20G1ALD430AN0NNNNN
Series	PowerFlex 755
Voltage	480 VAC
Phase	3 Phase
Output Current	430 A
Low-Duty Rating	400 HP
Normal-Duty Rating	350 HP
Heavy-Duty Rating	300 HP
Cooling	Forced Air
Frame	Frame 8
Enclosure	Type 1 / IP20
Installation	800 mm Deep MCC Style
Communication	Embedded EtherNet/IP
HIM	No HIM
Dynamic Braking	None
Dimensions	Large Frame 8
Weight	Configuration dependent

This model can be considered where the motor current requirement is within the 430 A range.

---

26. Related Model: 20G1ALD485JN0NNNNN

The 20G1ALD485JN0NNNNN has essentially the same major electrical rating as the subject model but uses the newer JN configuration.

Parameter	Specification
Model	20G1ALD485JN0NNNNN
Series	PowerFlex 755
Voltage	480 VAC
Phase	3 Phase
Output Current	485 A
Low-Duty Rating	450 HP
Normal-Duty Rating	400 HP
Heavy-Duty Rating	350 HP
Cooling	Forced Air
Frame	Frame 8
Enclosure	Type 1 / IP20
Installation	800 mm Deep MCC Style
Communication	Embedded EtherNet/IP
HIM	No HIM
Dynamic Braking	None
Depth	800 mm class
Weight	Configuration dependent

This is one of the most directly comparable models because the major electrical ratings remain the same.

---

27. Related Model: 20G1ALD485JN2NNNNN

The 20G1ALD485JN2NNNNN is the HIM-equipped version of the same general 485 A configuration.

Parameter	Specification
Model	20G1ALD485JN2NNNNN
Series	PowerFlex 755
Voltage	480 VAC
Phase	3 Phase
Output Current	485 A
Low-Duty Rating	450 HP
Normal-Duty Rating	400 HP
Heavy-Duty Rating	350 HP
Cooling	Forced Air
Frame	Frame 8
Enclosure	Type 1 / IP20
Communication	Embedded EtherNet/IP
HIM	HIM Equipped
Installation	Floor Standing
Depth	800 mm class
Weight	Configuration dependent

This model can be considered when a local operator interface is desirable.

---

28. Related Model: 20G1ALD485JN4NNNNN

The 20G1ALD485JN4NNNNN provides an enhanced local operator interface.

Parameter	Specification
Model	20G1ALD485JN4NNNNN
Series	PowerFlex 755
Voltage	480 VAC
Phase	3 Phase
Output Current	485 A
Low-Duty Rating	450 HP
Normal-Duty Rating	400 HP
Heavy-Duty Rating	350 HP
Cooling	Forced Air
Frame	Frame 8
Enclosure	Type 1 / IP20
Communication	Embedded EtherNet/IP
HIM	Enhanced LCD / Full Numeric
HIM Protection	IP66 / NEMA Type 4X/12 class
Installation	Floor Standing
Depth	800 mm class
Weight	Configuration dependent

This model is appropriate for installations where local commissioning and operator access are important.

---

29. Related Model: 20G1ALD545AN0NNNNN

The 20G1ALD545AN0NNNNN increases the output-current capacity to approximately 545 A.

Parameter	Specification
Model	20G1ALD545AN0NNNNN
Series	PowerFlex 755
Voltage	480 VAC
Phase	3 Phase
Output Current	545 A
Low-Duty Rating	500 HP
Normal-Duty Rating	450 HP
Heavy-Duty Rating	350 HP
Cooling	Forced Air
Frame	Frame 8
Enclosure	Type 1 / IP20
Communication	Embedded EtherNet/IP
HIM	No HIM
Installation	Floor Standing
Depth	800 mm class
Weight	Configuration dependent

This model provides additional current capacity for larger motor applications.

---

30. Five Same-Brand Popular Models

The following models represent different parts of the Allen-Bradley PowerFlex product range and can be used as comparison points.

Model	Series	Voltage Class	Current / Power Class	Typical Application
25B-D010N104	PowerFlex 525	480 VAC Class	10 A Class	Compact machine control
25C-D010N103	PowerFlex 527	480 VAC Class	10 A Class	Machine automation
20F11NC2P1JA0NNNNN	PowerFlex 753	480 VAC Class	Small / Medium	Industrial motor control
20F11NC8P0JA0NNNNN	PowerFlex 753	480 VAC Class	Medium	Industrial machinery
20G1ALD485AN0NNNNN	PowerFlex 755	480 VAC	485 A	Large industrial motor control

These models cover a very broad range of motor sizes.

The PowerFlex 525 and PowerFlex 527 are more compact solutions, while the PowerFlex 753 and PowerFlex 755 are designed for larger industrial equipment and more demanding control architectures.

---

31. PowerFlex 525 Comparison

The 25B-D010N104 is a compact variable-frequency drive intended for smaller machinery.

Parameter	25B-D010N104	20G1ALD485AN0NNNNN
Series	PowerFlex 525	PowerFlex 755
Voltage Class	480 VAC Class	480 VAC
Current Class	Approximately 10 A	485 A
Application Scale	Compact	Large Industrial
Installation	Compact	Floor Standing
Frame	Small	Frame 8
Cooling	Compact Drive Cooling	Forced Air
Communication	Industrial Network Capable	Embedded EtherNet/IP
Motor Size	Small / Medium	Large
Dimensions	Compact	Large
Weight	Several kg class	Hundreds of kg class

The two drives address very different motor and installation requirements.

---

32. PowerFlex 527 Comparison

The 25C-D010N103 is part of the PowerFlex 527 family.

It is more focused on machine-level automation and coordinated motor control.

Parameter	25C-D010N103	20G1ALD485AN0NNNNN
Series	PowerFlex 527	PowerFlex 755
Voltage Class	480 VAC Class	480 VAC
Current Class	Low Current	485 A
Installation	Compact	Floor Standing
Frame	Compact	Frame 8
Application	Machine Automation	Large Industrial
Cooling	Compact	Forced Air
Communication	Networked Control	Embedded EtherNet/IP
Local Interface	Configuration Dependent	No HIM
Dimensions	Compact	Large
Weight	Low	High

---

33. PowerFlex 753 Comparison

The 20F11NC2P1JA0NNNNN is a PowerFlex 753 configuration.

It can be considered for industrial motor applications where the power requirement is below the large Frame 8 PowerFlex 755 range.

Parameter	20F11NC2P1JA0NNNNN	20G1ALD485AN0NNNNN
Series	PowerFlex 753	PowerFlex 755
Voltage Class	480 VAC Class	480 VAC
Current	Lower Current Class	485 A
Installation	Panel / Cabinet	Floor Standing
Frame	Smaller	Frame 8
Cooling	Air Cooled	Forced Air
Communication	Network Options	Embedded EtherNet/IP
Application	Industrial Motor Control	Large Industrial Motor Control
Dimensions	Smaller	Large
Weight	Lower	Approximately hundreds of kg

---

34. PowerFlex 753 Medium-Current Comparison

The 20F11NC8P0JA0NNNNN is another PowerFlex 753 model that can be considered for medium-sized industrial machinery.

Parameter	20F11NC8P0JA0NNNNN	20G1ALD485AN0NNNNN
Series	PowerFlex 753	PowerFlex 755
Voltage Class	480 VAC Class	480 VAC
Current Class	Medium	485 A
Application	Industrial	Large Industrial
Installation	Panel / Cabinet	Floor Standing
Cooling	Air Cooled	Forced Air
Communication	Network Options	Embedded EtherNet/IP
Local Interface	Configuration Dependent	No HIM
Dimensions	Smaller	Large Frame 8
Weight	Lower	High

---

35. Comparison of Closely Related 480 VAC Models

Model	Voltage	Current	LD Rating	ND Rating	HD Rating	HIM
20G1ALD430AN0NNNNN	480 VAC	430 A	400 HP	350 HP	300 HP	No HIM
20G1ALD485AN0NNNNN	480 VAC	485 A	450 HP	400 HP	350 HP	No HIM
20G1ALD485JN0NNNNN	480 VAC	485 A	450 HP	400 HP	350 HP	No HIM
20G1ALD485JN2NNNNN	480 VAC	485 A	450 HP	400 HP	350 HP	HIM
20G1ALD485JN4NNNNN	480 VAC	485 A	450 HP	400 HP	350 HP	Enhanced HIM
20G1ALD545AN0NNNNN	480 VAC	545 A	500 HP	450 HP	350 HP	No HIM
20G1ALD617AN0NNNNN	480 VAC	617 A	600 HP	500 HP	400 HP	No HIM

This comparison shows the position of the 485 A model within the high-power 480 VAC PowerFlex 755 range.

The 485 A configuration sits above the 430 A class and below the higher-current 545 A and 617 A configurations.

---

36. Dimensions and Weight

The 20G1ALD485AN0NNNNN is a large Frame 8 drive.

For preliminary engineering and layout purposes, the following values can be used:

Mechanical Parameter	Approximate Value
Model	20G1ALD485AN0NNNNN
Frame	Frame 8
Installation	Floor Standing
Cabinet Style	MCC Style
Width	Approximately 600 mm
Height	Approximately 2,000–2,400 mm
Depth	800 mm
Approximate Weight	Approximately 500–650 kg
Cooling	Forced Air
Enclosure	Type 1 / IP20

The 800 mm depth is an important mechanical characteristic of the specified MCC-style configuration.

The width and height should be regarded as preliminary planning values rather than final fabrication dimensions.

The complete assembled equipment may weigh considerably more or less depending on the final cabinet configuration, power structure, disconnecting equipment, busbars, options, cable compartments, and other accessories.

For transportation and lifting, the final configuration-specific weight should always be confirmed before equipment handling.

---

37. Installation Considerations

Installation of a 485 A Frame 8 drive requires careful electrical and mechanical planning.

Important considerations include:

• Incoming power protection.
• Motor protection.
• Input cable sizing.
• Motor cable sizing.
• Grounding.
• EMC.
• Cabinet ventilation.
• Electrical-room temperature.
• Cable bending radius.
• Cable entry.
• Maintenance clearance.
• Floor loading.
• Lifting access.
• Network communication.
• Motor compatibility.
• Braking requirements.

The drive should be installed in an environment appropriate for a Type 1 / IP20 industrial electrical enclosure.

---

38. Cable Installation

The high current level requires appropriately sized power conductors.

Cable sizing should consider:

• Continuous current.
• Ambient temperature.
• Installation method.
• Cable grouping.
• Voltage drop.
• Insulation temperature.
• Applicable electrical requirements.

Motor cable installation should also consider electromagnetic compatibility.

High-power motor cables should be routed in a controlled manner, with communication and sensitive control wiring separated where practical.

Large cable bending radii should also be considered when planning the 800 mm deep MCC installation.

---

39. Grounding

Grounding is fundamental to reliable operation.

The drive enclosure, cabinet, motor frame, protective earth, and associated equipment should be bonded correctly.

A poor grounding arrangement can result in:

• Communication interference.
• Nuisance faults.
• Electromagnetic interference.
• Increased electrical noise.
• Safety concerns.

The grounding arrangement should therefore be designed before the drive is installed.

---

40. Motor Selection

The motor should be checked against the drive’s applicable duty rating.

Important motor information includes:

• Rated voltage.
• Rated current.
• Rated frequency.
• Rated speed.
• Motor horsepower.
• Service factor.
• Insulation system.
• Motor construction.
• Encoder requirements.
• Load type.

The motor full-load current should be compared with the applicable drive rating.

This is especially important because nominal horsepower alone does not fully describe the electrical requirements of a motor.

---

41. Load Type

The load profile should be evaluated before final drive selection.

Variable-Torque Loads

Examples include:

• Pumps.
• Fans.
• Blowers.

These loads generally have different torque characteristics from constant-torque machinery.

Constant-Torque Loads

Examples include:

• Conveyors.
• Mixers.
• Material handling.
• Process machinery.

These applications can require greater torque during acceleration.

High-Inertia Loads

Examples include:

• Large fans.
• Centrifuges.
• Large rotating equipment.

These applications require careful acceleration and deceleration calculations.

Regenerative Loads

Applications that return significant energy to the drive during deceleration require additional consideration.

The specified model has no dynamic braking, so the complete system must be evaluated if rapid stopping or regenerative operation is required.

---

42. Maintenance

Regular maintenance is important for large air-cooled drives.

Typical maintenance activities include:

• Inspecting cooling airflow.
• Inspecting cooling fans.
• Cleaning ventilation paths.
• Checking electrical connections.
• Inspecting motor cable terminations.
• Reviewing fault history.
• Reviewing alarm history.
• Checking cabinet temperature.
• Inspecting grounding connections.
• Checking network communication.
• Inspecting for overheating.

Dust accumulation should be avoided because it can reduce airflow and cooling efficiency.

---

43. Commissioning

A structured commissioning process should be used.

A typical sequence includes:

1. Confirm the exact drive model.
2. Verify incoming voltage.
3. Verify motor nameplate information.
4. Check protective equipment.
5. Confirm grounding.
6. Inspect input connections.
7. Inspect motor connections.
8. Check communication wiring.
9. Verify cooling airflow.
10. Configure motor parameters.
11. Configure acceleration.
12. Configure deceleration.
13. Configure speed limits.
14. Verify motor rotation.
15. Test start and stop commands.
16. Verify network communication.
17. Test fault response.
18. Confirm process feedback.
19. Record final operating parameters.

Because this is a high-power drive, commissioning should be performed by appropriately qualified personnel.

---

44. No-HIM Versus HIM Comparison

The closely related 485 A configurations provide different operator-interface arrangements.

Feature	20G1ALD485AN0NNNNN	20G1ALD485JN2NNNNN	20G1ALD485JN4NNNNN
Voltage	480 VAC	480 VAC	480 VAC
Output Current	485 A	485 A	485 A
Low Duty	450 HP	450 HP	450 HP
Normal Duty	400 HP	400 HP	400 HP
Heavy Duty	350 HP	350 HP	350 HP
Frame	8	8	8
EtherNet/IP	Yes	Yes	Yes
Local HIM	None	HIM	Enhanced LCD
HIM Protection	—	Configuration Dependent	IP66 / NEMA Type 4X/12 class
Installation	Floor Standing	Floor Standing	Floor Standing
Depth	800 mm class	800 mm class	800 mm class

The AN0 version is well suited to centralized automation.

The JN2 version provides local operator access.

The JN4 version provides an enhanced local operator interface for applications where local commissioning and monitoring are important.

---

45. Centralized Automation Applications

The no-HIM arrangement is particularly useful when multiple drives are controlled through a centralized PLC and HMI system.

The operator does not necessarily need to access each drive directly.

Instead, the central automation system can display:

• Motor speed.
• Motor current.
• Drive status.
• Fault status.
• Alarm status.
• Process feedback.
• Operating mode.
• Network status.

This architecture can be particularly useful in large plants where drives are installed inside dedicated electrical rooms.

---

46. Large Industrial Machine Applications

The 485 A current rating makes this model suitable for substantial machinery.

Potential applications include:

• Large pumps.
• Large fans.
• Industrial blowers.
• Long conveyors.
• Bulk material handling.
• Water-treatment systems.
• Mining machinery.
• Cement equipment.
• Process machinery.
• Industrial ventilation.

The final application selection should always be based on actual motor current and load characteristics.

---

47. Product Selection Checklist

Selection Item	Specification
Brand	Allen-Bradley
Product Series	PowerFlex 755
Exact Model	20G1ALD485AN0NNNNN
Input Voltage	480 VAC
Input Phase	3 Phase
Output Current	485 A
Low-Duty Rating	450 HP
Normal-Duty Rating	400 HP
Heavy-Duty Rating	350 HP
Cooling	Forced Air
Frame	Frame 8
Enclosure	Type 1 / IP20
Installation	Floor Standing
MCC Depth	800 mm
Communication	Embedded EtherNet/IP
HIM	Blank / No HIM
Input	AC Input with Precharge
DC Terminals	None
EMC	Filtered
Dynamic Braking	None
Approximate Width	600 mm
Approximate Height	2,000–2,400 mm
Depth	800 mm
Approximate Weight	500–650 kg
Main Applications	Pumps, Fans, Blowers, Conveyors, Process Machinery, Mining, Water Treatment

---

48. Overall Product Advantages

The Allen-Bradley 20G1ALD485AN0NNNNN combines high-current motor control with industrial network communication and a large Frame 8 mechanical platform.

Its 485 A output rating provides substantial capacity for large industrial motors.

The 450 HP Low-Duty rating allows the drive to be used with large variable-torque machinery.

The 400 HP Normal-Duty rating covers a broad range of general industrial applications.

The 350 HP Heavy-Duty rating makes the drive suitable for applications with greater overload requirements.

The embedded EtherNet/IP capability allows integration into centralized automation systems.

The forced-air cooling system supports operation at this high power level when suitable ventilation is provided.

The 800 mm deep MCC-style construction makes it suitable for floor-standing electrical installations.

The no-HIM configuration is particularly useful where local operation is not required and the drive is managed through a PLC or centralized HMI.

The drive can therefore serve as a practical high-power motor-control solution for many industrial sectors.

---

49. Final Technical Specification

Category	Specification
Brand	Allen-Bradley
Product Series	PowerFlex 755
Model	20G1ALD485AN0NNNNN
Product Type	High-Power AC Variable Frequency Drive
Input Voltage	480 VAC
Input Phase	3 Phase
Output Current	485 A
Low-Duty Rating	450 HP
Normal-Duty Rating	400 HP
Heavy-Duty Rating	350 HP
Low-Duty Approx.	336 kW
Normal-Duty Approx.	298 kW
Heavy-Duty Approx.	261 kW
Cooling	Forced Air
Frame	Frame 8
Enclosure	Type 1 / IP20
Installation	Floor Standing
MCC Style	800 mm Deep
Communication	Embedded EtherNet/IP
HIM	Blank / No HIM
Input	AC Input with Precharge
DC Terminals	None
EMC	Filtered
Dynamic Braking	None
Approximate Width	About 600 mm
Approximate Height	About 2,000–2,400 mm
Depth	800 mm
Approximate Weight	About 500–650 kg
Typical Applications	Pumps, Fans, Blowers, Conveyors, Process Equipment, Mining, Cement, Water Treatment
Installation Environment	Protected Industrial Electrical Area

---

50. Final Product Description

The Allen-Bradley 20G1ALD485AN0NNNNN PowerFlex 755 AC Drive is a high-capacity industrial variable-frequency drive designed for large three-phase motor applications.

With a 480 VAC input, 485 A output current rating, 450 HP Low-Duty rating, 400 HP Normal-Duty rating, and 350 HP Heavy-Duty rating, the drive is intended for substantial industrial motor-control requirements.

Its Frame 8 construction and 800 mm deep MCC-style configuration make it suitable for floor-standing electrical installations where a large drive and associated power equipment can be accommodated.

The forced-air cooling system provides the thermal-management arrangement required for high-power operation, while the Type 1 / IP20 configuration is intended for a suitable protected industrial environment.

The embedded EtherNet/IP communication capability allows the drive to participate in a larger industrial automation network.

This makes it possible to integrate drive commands, motor feedback, operating status, alarms, and diagnostic information into a centralized control system.

The Blank / No HIM configuration is particularly appropriate for centralized automation architectures.

In such an arrangement, the drive can remain inside an electrical room while operators interact with it through a PLC, HMI, SCADA system, or engineering workstation.

The model can be applied to large pumps, fans, blowers, conveyors, water-treatment equipment, mining systems, cement machinery, process equipment, and other high-power industrial machines.

For applications with substantial mechanical inertia or rapid stopping requirements, the absence of dynamic braking should be considered carefully during system design.

The 485 A rating also places this model between several nearby PowerFlex 755 configurations, making it a useful option when a 430 A drive does not provide sufficient current but a larger 545 A or 617 A configuration would provide more capacity than necessary.

For preliminary mechanical planning, the unit can be treated as a large Frame 8 floor-standing drive with an 800 mm depth, approximately 600 mm width, approximately 2,000–2,400 mm height, and an estimated complete installation weight in the 500–650 kg range.

These dimensions and weight values should be treated as planning estimates rather than final fabrication data.

The final mechanical configuration should be checked before cabinet manufacturing, transportation, lifting, floor-loading calculations, or installation.

From an application standpoint, the most important selection factors are the motor nameplate current, motor voltage, duty cycle, load type, acceleration requirements, deceleration requirements, braking requirements, ambient conditions, cooling arrangement, grounding, EMC design, and communication architecture.

The 20G1ALD485AN0NNNNN is therefore best viewed as a large industrial PowerFlex 755 configuration for applications that require high current capacity, substantial motor power, networked control, and a robust floor-standing drive installation.