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

Allen-Bradley 20G11TD485JN0NNNNN PowerFlex 755 AC Drive – Detailed Product Introduction, Technical Specifications, Applications, Advantages and Related Models

1. Product Overview

The Allen-Bradley 20G11TD485JN0NNNNN is a high-power PowerFlex 755 AC Drive designed for demanding industrial motor-control applications where high output power, reliable speed regulation, flexible control functions, and integration with modern automation systems are required.

This model is part of the PowerFlex 750-Series and belongs specifically to the PowerFlex 755 family. It is a large-frame, air-cooled variable-frequency drive intended for industrial installations involving large motors and high-power mechanical loads.

The drive is rated for 480 VAC, three-phase operation and provides a nominal output current rating of 485 A under the specified normal-duty rating. Depending on the application duty cycle, the same drive can be applied at different horsepower ratings for light-duty, normal-duty, and heavy-duty operation.

The catalog number 20G11TD485JN0NNNNN identifies a specific configuration of the PowerFlex 755 platform. The configuration includes embedded Ethernet/IP capability, forced-air cooling, AC input with DC terminals, an open-type Frame 8 construction, EMC filtering, an installed CM jumper, no dynamic-braking hardware, and a blank configuration without a local HIM operator module.

The PowerFlex 755 architecture is intended to provide considerably more flexibility than a basic general-purpose VFD. It can be incorporated into sophisticated automation systems and can support applications involving pumps, fans, compressors, conveyors, mixers, extruders, material-handling systems, process machinery, and other large industrial machines.

For large motors, the combination of high current capacity, selectable duty ratings, programmable control functions, network integration, and feedback capability makes this drive suitable for applications where both power and control performance are important.

---

2. Brand and Product Family

Item	Description
Brand	Allen-Bradley
Product Family	PowerFlex 750-Series
Product Series	PowerFlex 755
Product Type	Industrial AC Variable Frequency Drive
Catalog Number	20G11TD485JN0NNNNN
Drive Type	PowerFlex 755 AC Drive
Cooling Method	Forced Air / Air Cooled
Installation Type	Open Type
Frame Size	Frame 8
Voltage Class	480 VAC
Phase	Three Phase
Main Application	High-power industrial motor control
Communication	Embedded Ethernet/IP
Input Configuration	AC Input with DC Terminals
EMC Configuration	Filtered
CM Jumper	Installed
Dynamic Braking	None
HIM	Blank / No HIM
Protection Configuration	Standard Protection

---

3. Detailed Technical Specifications

The following table summarizes the principal technical characteristics of the 20G11TD485JN0NNNNN.

Parameter	Specification
Model Number	20G11TD485JN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product Family	PowerFlex 750-Series
Drive Type	AC Variable Frequency Drive
Rated Input Voltage	480 VAC
Input Phase	3 Phase
Output Current – Light Duty	545 A
Output Current – Normal Duty	485 A
Output Current – Heavy Duty	414 A
Light-Duty Horsepower	450 HP
Normal-Duty Horsepower	400 HP
Heavy-Duty Horsepower	350 HP
Approx. Normal-Duty Power	300 kW class
Frame	Frame 8
Enclosure / Construction	Open Type
Cooling	Forced Air
Input Configuration	AC Input with DC Terminals
DC Bus Access	Yes
Dynamic Braking	None
EMC Filter	Filtered
CM Jumper	Installed
Operator Interface	Blank / No HIM
Network Interface	Embedded Ethernet/IP
Protection	Standard Protection
Mounting Concept	Floor / cabinet installation
Motor Control Application	Industrial AC motor speed and torque control
Approx. Reference Dimensions	720 × 2185 × 650 mm
Approx. Reference Dimensions in Meters	0.72 × 2.185 × 0.65 m
Approx. Reference Weight	335 kg
Exact Installed Weight	Configuration-dependent; verify final mechanical drawing
Recommended Installation	Industrial electrical cabinet / suitable drive enclosure
Intended Environment	Industrial applications
Typical Motor Range	Up to approximately 400 HP under normal-duty rating

The exact physical dimensions and installed weight can vary depending on the final mechanical arrangement, mounting accessories, cabinet construction, power structure configuration, disconnect equipment, cable entry arrangement, and other installation options.

For engineering, transportation, lifting, and cabinet-foundation calculations, the final equipment drawing should always be treated as the controlling mechanical reference.

---

4. Current and Horsepower Ratings

One of the important characteristics of this model is that its motor capacity changes according to the required application duty.

The 20G11TD485JN0NNNNN provides a higher current capability for light-duty applications and a lower current rating for heavy-duty applications. This allows one drive platform to be matched to different load profiles without treating all motors and machines as having the same operating requirements.

Duty Rating	Output Current	Approx. Horsepower	Typical Load Character
Light Duty	545 A	450 HP	Variable-torque / lighter overload requirements
Normal Duty	485 A	400 HP	General industrial operation
Heavy Duty	414 A	350 HP	Higher overload / demanding constant-torque applications

For a continuously loaded industrial machine, the duty rating should be selected based on the actual motor current, overload requirement, acceleration profile, ambient conditions, and machine load characteristics rather than simply selecting the largest horsepower number.

---

5. Electrical Configuration

The 20G11TD485JN0NNNNN is designed for 480 VAC three-phase industrial power systems.

Its input configuration includes an AC input with precharge functionality and DC terminals. The DC terminals can be useful in systems where DC-bus connections, regenerative energy management, braking arrangements, or other DC-bus-related configurations are required.

The drive is designed for high-power motor applications where a conventional small-frame VFD would not provide sufficient current capacity.

The 480 VAC class is widely used in industrial facilities, manufacturing plants, processing plants, pumping stations, material-handling systems, and large mechanical equipment.

---

6. Cooling System

The drive uses forced-air cooling.

At this power level, thermal management is a major consideration because the drive power section can generate substantial heat during continuous operation.

The forced-air cooling system helps remove heat from the power components and maintain appropriate operating temperatures during normal operation.

Proper cabinet ventilation is especially important for Frame 8 installations. The surrounding cabinet design must provide suitable airflow, adequate heat dissipation, appropriate clearances, and service access.

For installations with multiple heat-producing devices, the total cabinet heat load should be considered rather than calculating the drive in isolation.

---

7. Frame 8 Construction

The 20G11TD485JN0NNNNN uses a Frame 8 power structure.

Frame 8 indicates that this is a physically large, high-power drive rather than a compact panel-mounted VFD.

Large-frame drives require more attention during installation because of their physical size and weight. Mechanical lifting, cabinet mounting, cable routing, grounding, ventilation, and service clearances should all be considered during the engineering stage.

The physical scale of the equipment also means that the drive should generally be treated as part of a complete industrial electrical system rather than as a small standalone electronic device.

---

8. Communication and Automation Integration

A major advantage of the PowerFlex 755 platform is its integration capability.

The 20G11TD485JN0NNNNN configuration includes embedded Ethernet/IP, allowing the drive to participate in Ethernet-based industrial automation architectures.

This can simplify communication between the drive and a PLC or other automation controller.

Typical information that can be exchanged through the automation network includes speed reference, start and stop commands, operating status, output frequency, motor current, fault information, alarms, and other drive-related data.

For plants using centralized control systems, this can reduce the need for extensive hardwired control connections.

---

9. EMC Filtering and CM Jumper Configuration

This model is configured with EMC filtering and the CM jumper installed.

EMC filtering is important in industrial installations where electrical noise and electromagnetic interference need to be managed.

Variable-frequency drives use high-speed switching power electronics, and the resulting electrical noise can interact with nearby control equipment, instrumentation, communication wiring, and other sensitive devices.

Correct grounding, cable routing, shield termination, cabinet construction, and EMC practices remain important even when the drive itself is equipped with filtering.

The CM jumper configuration should be considered together with the plant grounding system and the motor-cable installation method.

---

10. Operator Interface

The catalog configuration is specified as Blank / No HIM.

HIM refers to the Human Interface Module normally used for local drive operation, configuration, monitoring, and troubleshooting.

The absence of a HIM does not mean that the drive lacks programming or diagnostic capabilities. Instead, commissioning can be performed through appropriate programming tools, network communication, external control equipment, or a separately selected operator interface.

This configuration can be useful when the drive is installed inside a larger automation cabinet where local control is handled through an HMI, PLC, or plant control system.

---

11. Dynamic Braking

The standard configuration of 20G11TD485JN0NNNNN is specified as having no dynamic braking.

Dynamic braking is normally considered when a motor-driven load needs controlled deceleration and the kinetic energy of the machine must be dissipated.

Applications with high-inertia loads, rapid stopping requirements, or frequent deceleration cycles may require a separate braking strategy.

For these applications, the engineering team should determine whether external braking equipment or another regenerative-energy solution is required.

---

12. Mechanical Dimensions and Weight

Because this is a large Frame 8 drive, physical installation requirements are considerably more demanding than those of small and medium VFDs.

A commonly listed reference size for this catalog configuration is approximately 720 mm wide × 2185 mm high × 650 mm deep, with a reference weight of approximately 335 kg.

These values should be regarded as installation-reference figures rather than a substitute for the final mechanical drawing.

Mechanical Parameter	Reference Value
Model	20G11TD485JN0NNNNN
Frame Size	Frame 8
Approx. Width	720 mm
Approx. Height	2185 mm
Approx. Depth	650 mm
Approx. Weight	335 kg
Weight in kg	≈335 kg
Weight in lb	≈738 lb
Installation	Floor / cabinet mounted
Construction	Open Type
Cooling	Forced Air
Service Consideration	Adequate front and surrounding access required

Because the drive is approximately 335 kg in the referenced configuration, lifting and positioning should be planned as part of the electrical installation.

The cabinet structure, mounting base, transportation method, lifting equipment, and floor loading capacity should all be checked before installation.

---

13. Product Introduction in Practical Terms

In practical industrial terms, the 20G11TD485JN0NNNNN is intended for controlling large electric motors where a standard small VFD is no longer sufficient.

A typical application may involve a large pump, fan, conveyor, compressor, mixer, extruder, blower, or other rotating machine requiring hundreds of horsepower.

The drive receives three-phase AC electrical power, converts the incoming electrical energy through its power electronics, and produces a controlled variable-frequency output for the motor.

By adjusting output frequency and voltage, the drive can control motor speed and provide controlled acceleration and deceleration.

This can reduce mechanical shock, improve process control, and allow the motor to operate closer to the actual process requirement.

---

14. Main Applications

Industrial Pumps

The drive can be used for large industrial pumping systems where variable motor speed is needed.

Examples include water treatment, process-water systems, cooling-water systems, industrial circulation pumps, large transfer pumps, and other high-capacity pumping equipment.

Speed control can allow the pump to match the actual process demand rather than running continuously at full speed.

---

Large Fans and Blowers

Large fans and blowers often benefit from variable-speed control.

The PowerFlex 755 can be used to regulate airflow while reducing unnecessary motor speed when full airflow is not required.

Typical applications include industrial ventilation, combustion-air systems, exhaust systems, cooling towers, air-handling systems, and process ventilation.

---

Conveyors

Large conveyor systems can require substantial starting torque and controlled acceleration.

The PowerFlex 755 can provide controlled motor acceleration and speed regulation, helping reduce mechanical stress on belts, couplings, gearboxes, shafts, and other components.

For large conveyors, proper drive sizing should take into account starting torque, belt loading, conveyor incline, acceleration time, and overload requirements.

---

Compressors

Large compressors are another important application area.

The drive can be used to control motor speed according to process demand, provided that the compressor manufacturer permits variable-frequency operation.

Applications may include industrial air systems, process compressors, refrigeration-related machinery, and other high-power rotating equipment.

---

Mixers and Process Machinery

Large mixers, agitators, and processing machines can require variable speed and substantial torque.

The PowerFlex 755 provides a flexible platform for applications where speed needs to be adjusted during different stages of a production cycle.

---

Extruders

Large extruders can require stable motor control and continuous operation.

The drive can provide controlled motor speed for production processes where the material flow and machine operating point need to be adjusted.

---

Material Handling

The drive is also suitable for high-power material-handling machinery.

Examples include heavy conveyors, bulk material systems, industrial lifting-related machinery, and other large rotating systems where controlled acceleration and speed are required.

---

15. Main Advantages

High-Power Capability

The most obvious advantage of this model is its high current capacity.

With a normal-duty rating of approximately 485 A / 400 HP, the drive is designed for large industrial motors.

This allows it to control motors that are far beyond the capacity range of compact general-purpose VFDs.

---

Multiple Duty Ratings

The drive provides different application ratings depending on the required duty.

This gives engineers greater flexibility when selecting the drive for variable-torque, normal industrial, or higher-overload applications.

The key ratings are:

Duty	Current	Horsepower
Light Duty	545 A	450 HP
Normal Duty	485 A	400 HP
Heavy Duty	414 A	350 HP

This makes the drive useful across a relatively broad range of large-motor applications.

---

Embedded Ethernet/IP

Embedded Ethernet/IP is one of the strongest practical advantages for modern automation systems.

It can simplify communication between the drive and a PLC-based control system and can reduce the amount of traditional hardwired control wiring required.

For facilities already using Ethernet-based industrial control architectures, this can make the drive easier to integrate into the overall automation system.

---

Flexible Industrial Control

The PowerFlex 755 platform is designed for applications that require more than simple speed adjustment.

It supports sophisticated motor-control and feedback arrangements and can be integrated into systems requiring coordinated control of multiple drives.

---

Large Industrial Application Range

A single PowerFlex 755 family covers a broad range of industrial power requirements.

This can be useful for plants that want to standardize on one drive family across multiple machine types.

Standardizing on one drive family can simplify engineering, spare-parts management, maintenance procedures, and technician training.

---

Air-Cooled Design

Forced-air cooling provides a practical thermal-management approach for large industrial drives.

It is well suited to installations where cabinet ventilation and environmental control can be properly engineered.

---

Open-Type Construction

The open-type configuration allows the drive to be incorporated into a larger electrical cabinet or industrial control enclosure.

This provides flexibility for system integrators who need to combine the drive with disconnects, contactors, control equipment, PLC systems, network equipment, and other electrical components.

---

16. Typical Application Selection Guide

Application	Suitability	Main Reason
Large Water Pump	Excellent	Variable-speed control and high power
Cooling Water Pump	Excellent	High-power motor control
Industrial Fan	Excellent	Variable-speed airflow control
Large Blower	Excellent	High-current motor capacity
Conveyor	Excellent	Controlled acceleration and speed
Compressor	Very Good	Large motor speed control
Mixer	Very Good	Variable speed and torque control
Extruder	Very Good	Controlled process speed
Material Handling	Very Good	High-power motor control
Process Machinery	Excellent	Flexible industrial automation
Small Motor	Poor Choice	Drive is unnecessarily large
High-Speed Servo Application	Not the Primary Choice	A dedicated servo platform may be more appropriate

---

17. Five Recommended Models from the Same PowerFlex 755 Series

The following models are closely related PowerFlex 755, 480 VAC, three-phase, Frame 8 configurations and are useful alternatives when selecting a drive according to motor current and duty requirements.

Model	Voltage	Normal-Duty Current	Normal-Duty HP	Light-Duty HP	Heavy-Duty HP	Frame
20G11TD430JN0NNNNN	480 VAC, 3 PH	430 A	350 HP	400 HP	300 HP	8
20G11TD545JN0NNNNN	480 VAC, 3 PH	545 A	450 HP	500 HP	350 HP	8
20G11TD617JN0NNNNN	480 VAC, 3 PH	617 A	500 HP	600 HP	400 HP	8
20G11TD710JN0NNNNN	480 VAC, 3 PH	710 A	600 HP	650 HP	450 HP	8
20G11TD740JN0NNNNN	480 VAC, 3 PH	740 A	650 HP	700 HP	500 HP	8

These models are particularly useful when the motor size is close to the capacity range of the 485 A model.

For example, if a machine requires more than 485 A during its selected duty condition, moving to the 20G11TD545JN0NNNNN or larger model can provide additional current capacity.

Conversely, if the motor requirement is lower, the 20G11TD430JN0NNNNN can be considered as a smaller alternative within the same 480 VAC Frame 8 family.

---

18. Mechanical Reference for Related PowerFlex 755 Models

Because these models belong to the same large-frame family, their physical installation requirements are generally substantial.

Exact dimensions and weights should be confirmed against the final catalog configuration and mechanical drawing.

Model	Frame	Voltage	Approx. Application Size	Mechanical Class	Weight
20G11TD430JN0NNNNN	8	480 VAC	Up to 400 HP LD	Large Frame	Configuration-dependent
20G11TD485JN0NNNNN	8	480 VAC	Up to 450 HP LD	Large Frame	≈335 kg reference
20G11TD545JN0NNNNN	8	480 VAC	Up to 500 HP LD	Large Frame	Configuration-dependent
20G11TD617JN0NNNNN	8	480 VAC	Up to 600 HP LD	Large Frame	Configuration-dependent
20G11TD710JN0NNNNN	8	480 VAC	Up to 650 HP LD	Large Frame	Configuration-dependent

The weight of a complete installation can be considerably higher than the drive power structure alone because the final system may include cabinet sections, bus structures, disconnect devices, reactors, fuses, cable compartments, control components, and other accessories.

---

19. Five Popular Allen-Bradley Models from Other Drive Families

For customers who want to compare the PowerFlex 755 with other commonly used Allen-Bradley drive families, the following models represent different application and power classes.

Model	Series	Voltage Class	Phase	Approx. Current Class	Typical Application	Construction
25B-D024N114	PowerFlex 525	480 VAC class	3 PH	24 A class	General-purpose machinery	Compact
25B-D6P0N114	PowerFlex 525	480 VAC class	3 PH	6 A class	Small industrial motors	Compact
20F11NC3P4JA0NNNNN	PowerFlex 753	400/480 VAC class	3 PH	Small/medium frame	General industrial machinery	Modular
20F11ND077AA0NNNNN	PowerFlex 753	480 VAC class	3 PH	77 A class	Pumps, fans, conveyors	Industrial
25C-D043N114	PowerFlex 523	480 VAC class	3 PH	43 A class	General-purpose applications	Compact

These models are not direct substitutes for the 20G11TD485JN0NNNNN.

They belong to different capacity classes and are intended for different motor sizes and application requirements.

The PowerFlex 525 and PowerFlex 523 are generally much more compact and are better suited to smaller machines.

The PowerFlex 753 is positioned closer to the PowerFlex 755 in terms of industrial application flexibility, but the PowerFlex 755 is the more appropriate family when very high power, advanced control, and large motor applications are the primary requirements.

---

20. PowerFlex 755 Compared with Smaller Drive Families

Feature	PowerFlex 755	PowerFlex 753	PowerFlex 525	PowerFlex 523
Target Application	High-power industrial	Industrial general-purpose	Compact industrial	Compact general-purpose
Large Motor Capability	Excellent	Very Good	Limited compared with PF755	Limited compared with PF755
400 HP Class	Yes	Application-dependent	No	No
Embedded Ethernet/IP	Available	Available depending on configuration	Available	Available
Frame Size	Large	Small to large	Compact	Compact
Cabinet Requirement	Significant	Moderate to significant	Relatively small	Relatively small
High-Power Process Equipment	Excellent	Very Good	Limited	Limited
Advanced Industrial Control	Excellent	Very Good	Good	Basic to good
Typical Use	Large machines and processes	Industrial machines	Machine-level drives	Compact machines

---

21. Why Choose 20G11TD485JN0NNNNN?

The 20G11TD485JN0NNNNN is a strong choice when the application requires a large 480 VAC three-phase drive with approximately 400 HP normal-duty capacity.

Its 485 A normal-duty rating places it in a high-power range suitable for large industrial motors.

The combination of Frame 8 construction, forced-air cooling, Ethernet/IP communication, EMC filtering, DC terminals, and the flexible PowerFlex 755 architecture makes it particularly appropriate for engineered industrial systems.

It is also a useful choice for facilities that already use the PowerFlex family and want to maintain consistency across their drive installations.

---

22. Recommended Applications by Motor Size

Motor Size	Recommended Drive Approach	Comment
Below 50 HP	Smaller PowerFlex family	20G11TD485 is oversized
50–150 HP	PowerFlex 753 / 755 depending on requirements	Select based on motor current and control requirements
150–300 HP	PowerFlex 753 or 755	Application-specific selection
Around 300 HP	PowerFlex 755	Strong fit for high-power industrial applications
Around 350 HP	PowerFlex 755	Duty rating must be checked carefully
Around 400 HP	20G11TD485JN0NNNNN	Strong normal-duty application range
Around 450 HP	PowerFlex 755 larger-duty configuration	Check LD/ND/HD requirement
Above 450 HP	Larger PowerFlex 755 configuration	Select by current and duty
Above 600 HP	Larger Frame 8 / multi-drive configurations may be required	Detailed engineering required

The horsepower number alone should not be used for final drive selection.

Motor nameplate current, service factor, overload requirement, ambient temperature, altitude, acceleration time, load inertia, speed range, duty cycle, switching frequency, motor cable length, braking requirements, and environmental conditions should all be considered.

---

23. Important Engineering Considerations

Motor Current

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

For a 400 HP normal-duty motor, the motor nameplate current should be checked rather than assuming that every 400 HP motor has the same current requirement.

---

Duty Cycle

A conveyor, crusher, mixer, or other high-torque machine may require a heavier-duty selection than a centrifugal fan or pump.

The drive should therefore be selected based on the actual load profile.

---

Overload

Heavy-duty applications can require substantially greater overload capability.

If the motor must repeatedly accelerate a high-inertia load or operate at high torque for extended periods, the heavy-duty rating should be considered.

---

Cabinet Ventilation

Because the drive is forced-air cooled, cabinet airflow and heat removal are critical.

The cabinet designer should calculate the total heat dissipation of the complete electrical system and provide an appropriate cooling arrangement.

---

Cable Installation

High-power VFD installations require careful attention to motor-cable routing, grounding, shielding, EMC practices, and separation between power and control wiring.

The installation should be designed to minimize electrical interference and maintain reliable communication with control equipment.

---

Lifting and Handling

At approximately 335 kg in the referenced configuration, the drive should not be treated as a lightweight panel component.

The mechanical installation plan should include suitable lifting equipment and a safe method for positioning the drive.

---

24. Product Selection Summary

Category	20G11TD485JN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Family	PowerFlex 750-Series
Product Type	High-Power AC Drive
Voltage	480 VAC
Phase	3 Phase
Normal-Duty Current	485 A
Normal-Duty Rating	400 HP
Light-Duty Rating	450 HP
Heavy-Duty Rating	350 HP
Frame	8
Cooling	Forced Air
Construction	Open Type
Communication	Embedded Ethernet/IP
EMC	Filtered
CM Jumper	Installed
Dynamic Braking	None
HIM	Blank / No HIM
Approx. Dimensions	720 × 2185 × 650 mm
Approx. Weight	335 kg
Primary Market	Industrial automation
Main Strength	High-power flexible motor control

---

25. Final Product Description

The Allen-Bradley 20G11TD485JN0NNNNN PowerFlex 755 AC Drive is a high-power industrial variable-frequency drive designed for large 480 VAC three-phase motors and demanding automation applications.

With a normal-duty output rating of approximately 485 A and 400 HP, the drive provides substantial capacity for large pumps, fans, conveyors, compressors, blowers, mixers, extruders, process machinery, and material-handling systems.

Its PowerFlex 755 architecture provides a flexible platform for industrial motor control, while embedded Ethernet/IP makes the drive suitable for integration into modern PLC-based automation systems.

The Frame 8 construction, forced-air cooling, open-type design, EMC filtering, DC terminals, and flexible control architecture make the product appropriate for engineered electrical systems where drive performance and integration flexibility are more important than compact size.

The model’s 450 HP light-duty, 400 HP normal-duty, and 350 HP heavy-duty ratings provide additional flexibility when matching the drive to different load characteristics.

For large industrial projects, the 20G11TD485JN0NNNNN can be considered a strong mid-range choice within the high-power 480 VAC PowerFlex 755 Frame 8 family. When more current capacity is required, models such as 20G11TD545JN0NNNNN, 20G11TD617JN0NNNNN, 20G11TD710JN0NNNNN, and 20G11TD740JN0NNNNN provide progressively higher capacity.

For smaller machines, a PowerFlex 753, PowerFlex 525, or PowerFlex 523 model may be a more practical solution because those families offer more compact physical dimensions and lower power ratings.

Overall, the 20G11TD485JN0NNNNN is best viewed as a large industrial drive for applications requiring high current capacity, reliable variable-speed motor control, network integration, and the flexibility associated with the PowerFlex 755 platform.