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Allen-Bradley 20G1G3D960LNDNNNNN PowerFlex 755 AC Drive

1. Product Overview

The Allen-Bradley 20G1G3D960LNDNNNNN is a high-power PowerFlex 755 AC drive designed for large industrial motor-control applications where high current capacity, controlled acceleration, variable-speed operation, and integration with a larger automation system are required.

The product belongs to the PowerFlex 755 series and is a 480 VAC, three-phase, Frame 9 configuration. The D960 rating corresponds to a 960 A output-current class, making this model suitable for very large industrial motors and heavy-duty rotating equipment.

In the PowerFlex 755 range, the 20G1G3D960LNDNNNNN sits above the 800 A-class configuration and is intended for applications where a larger motor capacity is required.

The model is particularly relevant to large pumps, fans, blowers, compressors, conveyors, material-handling equipment, process machinery, mixers, and other industrial systems where a high-capacity variable-frequency drive is required.

The PowerFlex 755 architecture is designed to provide considerably more flexibility than a basic frequency converter. Depending on the final configuration, the drive can support different motor-control strategies, feedback arrangements, communication functions, operator interfaces, braking arrangements, and other options.

This makes the 20G1G3D960LNDNNNNN suitable for applications where the drive must operate as part of a complete machine or process-control system.

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2. Brand and Series Information

Parameter	Product Information
Brand	Allen-Bradley
Product Family	PowerFlex
Product Series	PowerFlex 755
Product Type	High-power AC variable frequency drive
Catalog Number	20G1G3D960LNDNNNNN
Voltage Class	480 VAC / 650 VDC class
Input Voltage	480 VAC class
Input Phase	Three-phase
Output Current	960 A
Frame Size	Frame 9
Cooling	Forced air
Enclosure Style	IP20 / NEMA / UL Type 1 MCC-style cabinet
Mounting	Floor-standing
Motor Control	Variable-speed AC motor control
Main Application	Large industrial motor systems
Product Architecture	Modular/configurable industrial drive

The 20G catalog family identifies the PowerFlex 755 product family, while the D voltage designation corresponds to the 480 VAC / 650 VDC class.

The 960 portion identifies the 960 A configuration.

The complete catalog number should be retained when specifying or replacing the drive because the remaining catalog characters can identify important configuration details.

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3. Main Technical Specifications

Parameter	20G1G3D960LNDNNNNN
Model	20G1G3D960LNDNNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Drive Type	AC variable frequency drive
Input Voltage	480 VAC class
DC Bus Voltage Class	650 VDC class
Input Phase	Three-phase
Output Current	960 A
Frame	Frame 9
Light Duty Motor Rating	Approximately 900 hp
Normal Duty Motor Rating	Approximately 800 hp
Heavy Duty Motor Rating	Approximately 700 hp
Cooling	Forced air
Cabinet Type	IP20 / NEMA / UL Type 1 MCC-style
Approx. Cabinet Height	2453 mm
Approx. Cabinet Width	1200 mm
Approx. Cabinet Depth	600 mm or 800 mm
Approx. Basic Weight	1246 kg
Approx. Height	96.6 in
Approx. Width	47.2 in
Approx. Depth	23.6 or 31.5 in
Approx. Weight	2748 lb / 1246 kg
Installation Type	Floor-standing
Motor Control	Variable-speed and torque control
Feedback	Configuration dependent
Communication	Configuration dependent
Dynamic Braking	Configuration dependent
HIM / Operator Interface	Configuration dependent
Intended Environment	Industrial
Typical Motor Size	Large industrial motors

The 960 A rating places this model firmly in the high-power range.

For applications using the Normal Duty rating, the model is associated with approximately 800 hp of motor capacity. Under Light Duty conditions, the motor rating can reach approximately 900 hp, while the Heavy Duty rating is approximately 700 hp.

These horsepower figures should be used as selection references rather than as substitutes for actual motor current calculations.

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4. Duty Rating

A major consideration when selecting a large AC drive is the actual load profile.

The same motor horsepower can have very different drive requirements depending on whether the motor is operating a centrifugal fan, pump, conveyor, compressor, mixer, or another machine.

The PowerFlex 755 rating structure distinguishes between Light Duty, Normal Duty, and Heavy Duty applications.

Duty Classification	Approx. Motor Rating	Typical Load Characteristics
Light Duty	900 hp class	Variable-torque loads and applications with moderate overload requirements
Normal Duty	800 hp class	General industrial variable-speed applications
Heavy Duty	700 hp class	Higher torque and more demanding overload conditions

The 800 hp Normal Duty rating is an important reference point for the 20G1G3D960LNDNNNNN.

For a high-inertia machine, constant-torque application, or equipment requiring frequent acceleration and deceleration, the Heavy Duty rating may be more relevant.

For a centrifugal pump or fan, the Light Duty rating may provide a larger usable motor range.

The final selection should therefore be based on motor nameplate current, load torque, acceleration requirements, overload requirements, and operating cycle.

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5. Physical Dimensions and Weight

The 20G1G3D960LNDNNNNN is a Frame 9 high-power drive and requires a dedicated floor-standing installation.

For the standard IP20 / NEMA / UL Type 1 MCC-style cabinet configuration, the approximate dimensions are 2453 mm high × 1200 mm wide × 600 mm or 800 mm deep, with a basic weight of approximately 1246 kg.

Physical Parameter	Specification
Model	20G1G3D960LNDNNNNN
Frame	Frame 9
Height	2453 mm
Width	1200 mm
Depth	600 mm or 800 mm
Basic Weight	1246 kg
Height in Inches	96.6 in
Width in Inches	47.2 in
Depth in Inches	23.6 or 31.5 in
Weight in Pounds	Approximately 2748 lb
Installation	Floor-standing
Cabinet Style	MCC-style
Cooling	Forced air
Handling	Heavy industrial lifting equipment
Floor Loading	Must be evaluated before installation
Service Space	Required around the equipment

The weight of approximately 1246 kg is an important engineering consideration.

This is not a small electronic cabinet that can be moved manually. Transportation, unloading, positioning, lifting and final installation require suitable industrial handling equipment.

The installation route should also be checked in advance.

Door openings, corridors, elevators, loading areas and floor transitions can become important when moving equipment of this size.

If the final system includes additional option cabinets, the overall width and weight can increase considerably. The exact configured mechanical arrangement should therefore be confirmed before installation.

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6. Product Introduction

The PowerFlex 755 series is designed for demanding industrial motor-control applications where a basic variable-frequency drive is not sufficient.

The 20G1G3D960LNDNNNNN extends the PowerFlex 755 architecture into the high-capacity Frame 9 range.

Its 960 A output-current class provides the electrical capacity required by large industrial motors.

In practical terms, this means the drive can be used to control motors that would normally require a much larger electrical installation than those found in small machine applications.

The drive can provide controlled motor acceleration, speed regulation, deceleration and torque management.

This is particularly useful when the motor is connected to a large mechanical system.

Starting a large motor directly across the line can create substantial electrical and mechanical stresses. Variable-frequency control provides a way to bring the motor up to speed progressively.

The same principle applies when stopping the machine.

A controlled deceleration profile can help reduce mechanical shock and can provide a more predictable stopping response.

The PowerFlex 755 architecture also allows the drive to be integrated into a larger industrial control system.

Depending on the configuration, feedback devices, communication interfaces, operator interfaces and other options can be incorporated into the overall drive system.

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7. Main Applications

7.1 Large Water and Process Pumps

Large pumps are a natural application for a high-power variable-frequency drive.

The 20G1G3D960LNDNNNNN can be used where the pump motor needs to operate at different speeds according to actual process demand.

Variable-speed operation can provide greater flexibility than fixed-speed operation.

Typical applications include large water pumps, process pumps, circulation pumps, cooling-water systems, fluid-transfer equipment and industrial pumping systems.

Controlled acceleration can also reduce sudden mechanical loading on pump components and connected piping.

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7.2 Large Fans and Blowers

Large fans and blowers frequently operate under changing airflow requirements.

The drive can adjust motor speed according to the required airflow or process condition.

This is useful for large ventilation systems, process-air systems, industrial exhaust systems, cooling systems and other high-capacity air-moving equipment.

The high current capability of the D960 configuration makes it appropriate for large fan motors that exceed the practical range of smaller drives.

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7.3 Large Compressors

Compressors can present significant starting and acceleration demands.

A high-power variable-frequency drive can provide controlled acceleration and operating-speed control.

This can be useful for industrial compressor systems where motor speed needs to be coordinated with the process.

The final drive selection should take into account compressor type, motor current, starting torque, acceleration time, operating cycle and overload requirements.

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7.4 Heavy Conveyors

Large conveyors can have considerable inertia and can carry substantial loads.

Starting such equipment abruptly can place significant stress on belts, shafts, couplings, gearboxes and motors.

The 20G1G3D960LNDNNNNN can provide controlled acceleration and speed regulation for large conveyor systems.

This can be particularly useful in bulk-material handling and other applications where smooth starting and stopping are important.

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7.5 Material-Handling Systems

Large material-handling systems often require controlled motor movement and coordination with other machinery.

The drive can be incorporated into a larger control system where speed references, operating commands, status information and fault information are exchanged with the machine-control architecture.

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7.6 Mixers and Agitators

Large mixers and agitators can require significant starting torque.

The mechanical load can also vary substantially during operation.

The PowerFlex 755 platform can be configured for applications where motor speed and torque need to change according to the process.

For demanding mixer applications, Heavy Duty selection should be evaluated carefully.

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7.7 Large Process Machinery

Large process machines may require different operating speeds during different stages of production.

Variable-frequency control can allow the motor to operate at the speed required by the process rather than continuously operating at one fixed speed.

This can be useful for large rotating process equipment, production machinery, and industrial utility systems.

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8. Product Advantages

8.1 High 960 A Current Capacity

The main characteristic of the 20G1G3D960LNDNNNNN is its high output-current capability.

At 960 A, the drive is intended for large industrial motors.

This makes it suitable for applications that are beyond the practical range of compact and medium-size variable-frequency drives.

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8.2 Large Motor Capability

The drive can accommodate approximately 900 hp Light Duty, 800 hp Normal Duty, and 700 hp Heavy Duty motor applications.

This provides a substantial range for large motor systems.

The actual motor must still be selected according to nameplate current and application requirements, but the high power capacity gives engineers significant flexibility.

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8.3 Frame 9 High-Power Architecture

Frame 9 provides the physical and electrical structure required for high-current applications.

The larger cabinet arrangement also provides a practical platform for high-power industrial installations.

This makes the drive suitable for dedicated electrical rooms and large motor-control installations.

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8.4 Flexible Duty Selection

The Light Duty, Normal Duty and Heavy Duty ratings allow the drive to be considered for different types of mechanical loads.

A fan, pump and conveyor may all use motors of similar horsepower but require very different overload characteristics.

The duty-rating structure allows these differences to be taken into account.

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8.5 Controlled Acceleration

Large motors can produce significant starting stress.

The drive can provide controlled acceleration rather than an abrupt start.

This can help reduce mechanical shock and provide a smoother transition to operating speed.

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8.6 Controlled Deceleration

Controlled deceleration is equally important for high-inertia machinery.

The drive can be configured to provide a suitable deceleration profile for the application.

This can help reduce sudden loads on mechanical components and improve the overall stopping behavior of the machine.

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8.7 Flexible Control Architecture

The PowerFlex 755 platform supports a configurable architecture.

Depending on the final configuration, communication, feedback, operator-interface and other options can be added to suit the application.

This is useful when the drive must operate as part of a larger automation system.

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8.8 Suitable for Centralized High-Power Systems

The Frame 9 cabinet format is appropriate for centralized high-power installations.

Instead of treating the drive as a small component inside a machine, it can be installed as part of a dedicated motor-control area.

This is common in large industrial facilities where several high-power motor systems are concentrated in electrical rooms.

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9. Related PowerFlex 755 Models

The following models are closely related to the D960 configuration and can be considered when selecting a suitable high-power PowerFlex 755 drive.

Model	Voltage	Current Class	Frame	Light Duty	Normal Duty	Heavy Duty	Approx. Dimensions	Approx. Weight
20G1G3D740LNDNNNNN	480 VAC	740 A	8	700 hp class	650 hp class	500 hp class	2453 × 600 × 600/800 mm	~623 kg
20G1G3D800LNDNNNNN	480 VAC	800 A class	9	800 hp class	700 hp class	600 hp class	2453 × 1200 × 600/800 mm	~1246 kg
20G1G3D960LNDNNNNN	480 VAC	960 A	9	900 hp	800 hp	700 hp	2453 × 1200 × 600/800 mm	~1246 kg
20G1G3D1K0LNDNNNNN	480 VAC	1045 A class	9	900 hp class	900 hp class	750 hp class	2453 × 1200 × 600/800 mm	~1246 kg
20G1G3D1K2LNDNNNNN	480 VAC	1135 A class	9	1000 hp class	1000 hp class	800 hp class	2453 × 1200 × 600/800 mm	~1246 kg

The D740 configuration represents the upper end of the large Frame 8 range, while the D800 and D960 configurations move into Frame 9.

The D960 is particularly useful when the motor requirement is around the 800 hp Normal Duty class.

The larger D1K0 and D1K2 configurations provide additional current capacity for even larger motor applications.

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10. Five Recommended Same-Series or Related Models

Model	Series	Voltage	Frame	Current Class	Normal Duty Motor Rating	Heavy Duty Motor Rating	Approx. Dimensions	Approx. Weight
20G1G3D710LNDNNNNN	PowerFlex 755	480 VAC	8	710 A	600 hp class	450 hp class	2453 × 600 × 600/800 mm	~623 kg
20G1G3D740LNDNNNNN	PowerFlex 755	480 VAC	8	740 A	650 hp class	500 hp class	2453 × 600 × 600/800 mm	~623 kg
20G1G3D800LNDNNNNN	PowerFlex 755	480 VAC	9	800 A class	700 hp class	600 hp class	2453 × 1200 × 600/800 mm	~1246 kg
20G1G3D960LNDNNNNN	PowerFlex 755	480 VAC	9	960 A	800 hp	700 hp	2453 × 1200 × 600/800 mm	~1246 kg
20G1G3D1K0LNDNNNNN	PowerFlex 755	480 VAC	9	1045 A class	900 hp class	750 hp class	2453 × 1200 × 600/800 mm	~1246 kg

These five models provide a practical progression around the D960 configuration.

The D710 and D740 are appropriate for applications that remain within the Frame 8 capacity.

The D800, D960 and D1K0 provide progressively greater capacity within the Frame 9 range.

For a replacement project, the motor’s actual current and duty requirement should be compared with the existing drive before moving between these ratings.

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11. Five Representative Same-Brand Models

The following five models represent other widely used members of the same brand’s PowerFlex product range and cover considerably smaller power levels than the D960.

Model	Series	Voltage Class	Current Class	Approx. Power Range	Approx. Dimensions	Approx. Weight	Typical Application
25B-D010N114	PowerFlex 525	480 VAC	10 A class	Approx. 4–7.5 kW	Approx. 180 × 100 × 200 mm	~2–3 kg	Small pumps, fans and conveyors
25B-D017N114	PowerFlex 525	480 VAC	17 A class	Approx. 7.5–11 kW	Approx. 180 × 100 × 200 mm	~3 kg	General industrial machinery
25B-D024N114	PowerFlex 525	480 VAC	24 A class	Approx. 11–15 kW	Approx. 180 × 100 × 200 mm	~3–4 kg	Medium motor applications
25A-D017N114	PowerFlex 523	480 VAC	17 A class	Approx. 7.5–11 kW	Approx. 180 × 100 × 200 mm	~2–3 kg	Compact machine applications
20F1ANC030JA0NNNNN	PowerFlex 753	480 VAC	30 A class	Approx. 15–22 kW	Approx. 300 × 200 × 250 mm	~15–20 kg	Industrial machinery and process equipment

These models are not direct electrical replacements for the 20G1G3D960LNDNNNNN.

They represent different levels of the PowerFlex product range and are more appropriate for smaller motors.

The comparison is useful when selecting the correct drive family for a project because it shows how the physical size and current capacity change as the motor application becomes larger.

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12. Frame 8 Versus Frame 9

The difference between Frame 8 and Frame 9 is important when considering the D960 configuration.

Feature	Frame 8	Frame 9
Typical Width	600 mm	1200 mm
Typical Depth	600 or 800 mm	600 or 800 mm
Cabinet Height	2453 mm	2453 mm
Basic Weight	Approximately 623 kg	Approximately 1246 kg
Typical Current Range	Lower high-power range	Higher high-power range
Installation	Floor-standing	Floor-standing
Handling	Heavy industrial equipment	Very heavy industrial equipment
Typical Use	Large motors	Very large motors

The most noticeable difference is the cabinet width and weight.

A Frame 9 unit is approximately twice the width of the basic Frame 8 cabinet and approximately twice the basic weight.

This means that changing from a Frame 8 model to the D960 Frame 9 configuration may require changes to the mechanical installation even when the electrical system can accommodate the larger drive.

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13. Application Selection by Load Type

Application	Typical Load	D960 Application Consideration
Large centrifugal pump	Variable torque	Light or Normal Duty may be applicable
Large cooling fan	Variable torque	Light Duty may be applicable
Industrial blower	Variable torque	Light or Normal Duty
Heavy conveyor	Constant torque	Normal or Heavy Duty
Large mixer	High starting torque	Heavy Duty consideration
Compressor	Process-dependent	Normal or Heavy Duty
Agitator	Variable/high torque	Heavy Duty consideration
Material handling	Constant torque	Heavy Duty consideration
Large process machine	Application-specific	Duty calculation required
Large rotating machinery	Application-specific	Motor current and overload determine sizing

The D960 configuration should therefore be selected based on the actual machine rather than simply using the largest horsepower number shown in the drive table.

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14. Installation Considerations

A 960 A-class drive requires careful electrical and mechanical planning.

The physical installation should begin with the equipment footprint.

The standard Frame 9 MCC-style arrangement is approximately 2453 mm high × 1200 mm wide × 600 or 800 mm deep.

Adequate room should be provided around the equipment for cable termination, ventilation, inspection and maintenance.

The floor must also be capable of supporting the approximately 1246 kg basic cabinet weight.

The transportation route should be checked before delivery.

For equipment of this size, the available doorway width, ceiling clearance, floor transitions, lifting points and unloading area can all affect installation.

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15. Electrical Installation

The 960 A-class rating means that the electrical installation must be designed for substantial current.

Incoming conductors, protective devices, disconnecting equipment, grounding conductors and motor cables must be selected according to the actual installation conditions and applicable electrical requirements.

The motor cable installation should also be considered carefully.

High-power variable-frequency drives can produce electrical noise and high-frequency switching effects. Appropriate grounding and cable practices are therefore important.

The motor cable route should be planned together with control wiring and communication wiring to reduce unwanted interference.

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16. Thermal Management

Heat management is an important part of a high-power drive installation.

The 20G1G3D960LNDNNNNN uses forced-air cooling.

The electrical room or enclosure arrangement must provide adequate airflow and heat removal.

Ambient temperature should be controlled within the applicable operating range.

Dust, humidity and contamination should also be considered because restricted airflow can increase operating temperature and reduce equipment reliability.

For large drive rooms, the total heat generated by all installed electrical equipment should be considered rather than evaluating the D960 drive in isolation.

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17. Motor Selection

The motor’s nameplate current is one of the most important pieces of information when selecting the D960.

A motor’s horsepower rating alone is not sufficient.

The actual current depends on motor voltage, efficiency, power factor and operating conditions.

The motor voltage must also correspond to the intended drive output range.

The mechanical load should then be evaluated.

A large fan generally has a different torque profile from a conveyor or mixer.

A conveyor may require high torque during acceleration, while a centrifugal fan normally follows a variable-torque characteristic.

The drive duty rating should therefore be selected based on the actual machine.

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18. Communication and Automation Integration

The PowerFlex 755 platform is designed to integrate with larger industrial control architectures.

Depending on configuration, the drive can communicate operating commands, speed references, status information, fault information and other data to the surrounding control system.

This is particularly useful in large plants.

A centralized control system can monitor the drive while the drive handles the local motor-control functions.

For large process equipment, this type of architecture can make it easier to coordinate the motor with valves, pumps, fans, sensors and other equipment.

The exact communication functions depend on the configured drive options.

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19. Feedback Applications

Some machines require more precise motor-speed control than a basic open-loop system can provide.

The PowerFlex 755 architecture supports feedback-oriented configurations through suitable hardware and options.

This can be useful when maintaining a controlled speed under changing load conditions is important.

Examples can include high-performance material handling, large rotating machinery and applications where motor speed needs to remain stable despite significant load changes.

The exact feedback hardware should be confirmed as part of the final catalog configuration.

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20. Maintenance Considerations

Because the 20G1G3D960LNDNNNNN is a high-power industrial drive, maintenance planning should be treated as part of the system design.

Forced-air cooling components should be kept clean and inspected according to the applicable maintenance schedule.

Ventilation paths should remain unobstructed.

Electrical connections should be inspected and maintained according to the applicable procedures.

The surrounding area should also be kept reasonably clean to reduce contamination of the cabinet and cooling system.

Because of the high voltage and high current involved, maintenance must be performed under appropriate electrical isolation and safety procedures by properly trained personnel.

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21. Recommended Use Cases

The 20G1G3D960LNDNNNNN is particularly suitable when several of the following conditions apply:

• The motor is in the large industrial power range.
• The application requires variable-speed operation.
• The motor requires controlled acceleration and deceleration.
• The machine has a significant mechanical load.
• The process requires different operating speeds.
• The drive must communicate with a larger control system.
• Feedback or advanced motor-control functions are required.
• A centralized floor-standing drive installation is acceptable.
• The application requires a high-current 480 VAC drive.

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22. Key Advantages at a Glance

Advantage	Description
960 A output class	Designed for very large industrial motors
900 hp Light Duty	High-capacity variable-torque applications
800 hp Normal Duty	Large general industrial applications
700 hp Heavy Duty	Demanding constant-torque applications
Frame 9 architecture	Designed for very high-power installations
Variable-speed control	Motor speed can be adjusted to process demand
Controlled acceleration	Helps reduce mechanical starting shock
Controlled deceleration	Provides controlled stopping behavior
Flexible architecture	Multiple control and interface options
Industrial integration	Suitable for larger automation systems
Large application range	Pumps, fans, conveyors, compressors and process machinery
Scalable product family	Related models available above and below the D960

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23. Overall Product Summary

The Allen-Bradley 20G1G3D960LNDNNNNN is a high-capacity PowerFlex 755 AC variable frequency drive designed for large industrial motor applications.

It belongs to the PowerFlex 755 series and uses a 480 VAC, three-phase, Frame 9 configuration.

Its primary current rating is 960 A, with approximately 900 hp Light Duty, 800 hp Normal Duty and 700 hp Heavy Duty motor capability.

The standard IP20 / NEMA / UL Type 1 MCC-style cabinet is approximately 2453 mm high × 1200 mm wide × 600 or 800 mm deep, with an approximate basic weight of 1246 kg.

The physical dimensions and weight clearly place this drive in the large industrial equipment category.

It is intended for applications such as large pumps, fans, blowers, compressors, conveyors, material-handling equipment, mixers, agitators and other high-power rotating machinery.

Its principal advantages are its high current capacity, large motor capability, flexible duty ratings, controlled acceleration and deceleration, configurable architecture, and suitability for integration into larger industrial automation systems.

The 20G1G3D960LNDNNNNN is particularly useful when a project requires an approximately 800 hp Normal Duty motor drive at the 480 VAC class.

For a practical installation, the motor’s nameplate current should be checked first, followed by the required duty classification, overload characteristics, acceleration requirements, ambient conditions, braking requirements, feedback requirements, communication requirements and enclosure arrangement.

The physical installation should also account for the approximately 1246 kg equipment weight and the 2453 × 1200 × 600/800 mm cabinet envelope.

For replacement applications, the complete catalog number should be retained rather than selecting a replacement based only on the 960 A rating, because the complete catalog number defines the specific configuration of the drive.