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Allen-Bradley 20G1G3D800LNDNNNNN PowerFlex 755 AC Drive

1. Product Overview

The Allen-Bradley 20G1G3D800LNDNNNNN is a high-power PowerFlex 755 AC drive designed for large industrial motor-control applications where substantial current capacity, controlled acceleration, variable-speed operation, and flexible drive-system integration are required.

This model belongs to the PowerFlex 755 series and is part of the large Frame 9 product range for 480 VAC applications. The D800 rating corresponds to the 800 A-class configuration, making this drive suitable for considerably larger motors than compact and medium-frame variable-frequency drives.

The model is intended for demanding industrial equipment such as large pumps, fans, compressors, conveyors, process machinery, material-handling systems, heavy rotating equipment, and other motor-driven systems where a high-capacity AC drive is required.

The PowerFlex 755 platform is designed as more than a simple frequency converter. It provides a flexible architecture for motor speed and torque control and can be configured with different control, feedback, communication, operator-interface, braking, and application-related options.

This makes the 20G1G3D800LNDNNNNN particularly useful when the drive needs to become an integral part of a larger industrial automation system.

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2. Brand and Series

Parameter	Product Information
Brand	Allen-Bradley
Product Family	PowerFlex
Product Series	PowerFlex 755
Product Type	High-power AC variable frequency drive
Catalog Number	20G1G3D800LNDNNNNN
Voltage Class	480 VAC
Input	Three-phase AC
Current Class	800 A class
Frame	Frame 9
Drive Architecture	High-power industrial AC drive
Cooling	Forced-air cooling
Typical Installation	Floor-standing / cabinet installation
Typical Duty	Large industrial motor applications
Enclosure Configuration	IP20 / NEMA / UL Type 1 MCC-style cabinet configuration
Main Function	Variable-speed and torque control of AC motors

The 20G1G3D800LNDNNNNN is therefore best classified as a high-capacity PowerFlex 755 drive rather than a general-purpose compact inverter.

The 20G product family covers a broad range of PowerFlex 755 configurations, allowing the same general drive architecture to be used from relatively small industrial motors through very large motor systems.

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3. Main Technical Specifications

Parameter	20G1G3D800LNDNNNNN
Model	20G1G3D800LNDNNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Drive Type	AC Variable Frequency Drive
Input Voltage	480 VAC class
Input Phase	Three-phase
Output Current	800 A class
Published Current Specification	Approximately 823 A for the referenced configuration
Frame Size	Frame 9
Light Duty Motor Rating	Approximately 800 hp
Normal Duty Motor Rating	Approximately 700 hp
Heavy Duty Motor Rating	Approximately 600 hp
Cooling Method	Forced air
Cabinet Type	IP20 / NEMA / UL Type 1 MCC-style
Installation	Floor-standing
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
Motor Control	Variable-speed AC motor control
Feedback	Configuration dependent
Communication	Configuration dependent
Dynamic Braking	Configuration dependent
Operator Interface	Configuration dependent
Intended Application	Large industrial motor systems

The 800 A-class configuration places this model in the high-power range of the PowerFlex 755 family.

The exact operating current and usable motor rating depend on the selected duty classification and installation conditions. For that reason, motor selection should always be based on the motor nameplate current and application duty rather than horsepower alone.

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4. Duty Ratings

The 20G1G3D800LNDNNNNN is designed for applications that may have different load characteristics.

The PowerFlex 755 rating system distinguishes between Light Duty, Normal Duty, and Heavy Duty applications. This is important because a motor driving a centrifugal fan does not normally have the same overload requirements as a conveyor, compressor, mixer, or other constant-torque machine.

Duty Classification	Approx. Motor Rating	Typical Application Characteristics
Light Duty	800 hp class	Variable-torque loads such as large fans and pumps
Normal Duty	700 hp class	General industrial variable-speed applications
Heavy Duty	600 hp class	Higher torque, demanding acceleration and overload conditions

The 700 hp Normal Duty rating is particularly important when comparing this model with other PowerFlex 755 configurations.

The Heavy Duty rating is lower because demanding constant-torque applications require greater thermal and overload capability.

For a real installation, the drive should therefore be sized according to the motor’s full-load current, starting requirements, acceleration time, load torque and overload profile.

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5. Physical Dimensions and Weight

The 20G1G3D800LNDNNNNN is a large Frame 9 drive and requires significantly more installation space than smaller PowerFlex models.

For an IP20 / NEMA / UL Type 1 MCC-style Frame 9 arrangement, the approximate dimensions are:

Physical Parameter	Specification
Model	20G1G3D800LNDNNNNN
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 cabinet
Handling	Heavy industrial lifting equipment required
Service Planning	Front and equipment-room access required

The physical dimensions are important when planning an electrical room or drive installation.

At approximately 1246 kg, the basic Frame 9 cabinet is substantially heavier than a typical compact or medium-size variable-frequency drive.

The equipment foundation, floor loading, transportation path, lifting method, cabinet position and maintenance access should therefore be considered before the drive is delivered.

The final dimensions may change when additional option cabinets or other enclosure arrangements are included. A complete mechanical layout should therefore be prepared for the exact configured unit.

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6. Product Introduction

The PowerFlex 755 series is intended for industrial applications where motor-control performance, flexibility and integration are more important than simply providing basic variable-frequency speed control.

The 20G1G3D800LNDNNNNN extends this architecture into the high-power Frame 9 range.

Its large current capacity makes it suitable for motors used in heavy industrial equipment. The drive can control motor speed and torque while providing controlled acceleration and deceleration.

This is especially valuable for large mechanical systems.

When a large motor starts directly across the line, the starting event can impose significant electrical and mechanical stress on the system. A properly configured variable-frequency drive can provide a controlled ramp-up rather than an abrupt transition from zero speed to operating speed.

Similarly, controlled deceleration can reduce sudden mechanical loading on gearboxes, couplings, belts, shafts and other components.

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

Depending on configuration, communication, feedback, operator-interface and other options can be incorporated into the drive system.

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7. Major Applications

7.1 Large Pump Systems

Large pumps are one of the most suitable applications for a high-power variable-frequency drive.

The 20G1G3D800LNDNNNNN can be used where pump speed needs to change according to process demand.

Instead of operating the motor continuously at one fixed speed, the drive can provide variable-speed operation.

This can be useful in water circulation, industrial process pumping, cooling systems, fluid-transfer systems and other high-capacity pumping applications.

Controlled acceleration and deceleration can also help reduce mechanical shock in the pump and connected piping system.

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7.2 Large Fans and Blowers

Large fans and blowers frequently operate under changing airflow requirements.

A variable-frequency drive allows motor speed to be adjusted according to actual demand.

This can be useful for industrial ventilation, process-air systems, large exhaust equipment, cooling equipment and other high-capacity airflow systems.

The high-power rating of the 20G1G3D800LNDNNNNN allows it to control large fan motors that exceed the practical range of smaller drives.

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7.3 Compressors

Large compressors can present demanding starting and acceleration conditions.

A high-power drive can provide controlled motor acceleration and help regulate operating speed.

Compressor applications require careful drive selection because torque requirements can vary significantly between different compressor designs.

The motor’s rated current, starting torque, acceleration requirements and operating cycle should therefore be evaluated before final drive selection.

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7.4 Heavy-Duty Conveyors

Large conveyors can require high torque during starting, especially when loaded with heavy material.

The 20G1G3D800LNDNNNNN can provide controlled acceleration and speed adjustment for large conveyor systems.

This can reduce sudden mechanical stress on belts, couplings, gearboxes and drive shafts.

For long conveyor systems, speed regulation can also be coordinated with upstream and downstream equipment.

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7.5 Material Handling

Large material-handling machines often require precise control of acceleration, speed and stopping.

The drive can be used in high-capacity conveying and transportation systems where motor power is substantial.

The ability to integrate drive status, commands and operating information into a larger control system can also simplify overall equipment management.

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7.6 Process Machinery

The PowerFlex 755 platform can be used for large process machinery such as mixers, agitators and rotating process equipment.

These applications may require different operating speeds at different stages of the production cycle.

Variable-speed operation allows the motor to respond to the process rather than remaining at one fixed operating speed.

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7.7 Heavy Industrial Rotating Equipment

The 800 A-class configuration is suitable for large rotating machines where the motor power is beyond the practical range of smaller drive families.

Examples include large mechanical systems, process equipment, industrial utilities and other heavy motor-driven machinery.

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8. Product Advantages

8.1 High Current Capacity

The primary advantage of the 20G1G3D800LNDNNNNN is its high current capability.

An 800 A-class drive provides a substantial amount of motor-control capacity and is intended for large industrial motors.

This allows one high-capacity drive to control a large motor without having to divide the application into multiple smaller drive systems solely to obtain the required current capability.

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8.2 Large Motor Compatibility

The drive can be used with motors in the approximately 600–800 hp range depending on duty classification.

This makes it particularly useful for heavy industrial machinery.

The actual motor should always be selected according to current and application duty, but the high horsepower capability gives engineers considerable flexibility for large motor systems.

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8.3 Flexible Duty Selection

The Light Duty, Normal Duty and Heavy Duty structure provides flexibility for different mechanical loads.

For example, a large fan may use the Light Duty rating while a demanding constant-torque machine may need the Heavy Duty rating.

This avoids treating every application as if it has the same overload requirements.

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8.4 Flexible System Integration

The PowerFlex 755 architecture supports multiple control and communication configurations.

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

Depending on configuration, operating commands, speed references, status information and diagnostic information can be exchanged between the drive and the overall control architecture.

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8.5 Controlled Acceleration

Large motors can place considerable mechanical stress on equipment during startup.

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

This is particularly valuable for conveyors, pumps, fans, compressors and other equipment with large rotating masses.

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8.6 Controlled Deceleration

The drive can also provide programmed deceleration.

This can help control stopping behavior and reduce unnecessary mechanical shock.

For machines with long rotating inertia, appropriate deceleration settings can be particularly important.

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8.7 Suitable for Large Process Systems

The Frame 9 design makes this model appropriate for large centralized industrial drive installations.

Rather than treating the drive as a small machine component, it can be incorporated into a dedicated electrical room or large motor-control installation.

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9. Related PowerFlex 755 Models

The following models are closely related 480 VAC PowerFlex 755 configurations.

Model	Voltage	Current Class	Frame	Light Duty	Normal Duty	Heavy Duty	Approx. Dimensions	Approx. Weight
20G1G3D617LNDNNNNN	480 VAC	617 A	8	600 hp	500 hp	400 hp	2453 × 600 × 600/800 mm	~623 kg
20G1G3D710LNDNNNNN	480 VAC	710 A	8	650 hp	600 hp	450 hp	2453 × 600 × 600/800 mm	~623 kg
20G1G3D740LNDNNNNN	480 VAC	740 A	8	700 hp	650 hp	500 hp	2453 × 600 × 600/800 mm	~623 kg
20G1G3D800LNDNNNNN	480 VAC	800 A class	9	800 hp	700 hp	600 hp	2453 × 1200 × 600/800 mm	~1246 kg
20G1G3D960LNDNNNNN	480 VAC	960 A class	9	900 hp	800 hp	700 hp	2453 × 1200 × 600/800 mm	~1246 kg

These models form a useful progression from large Frame 8 equipment into Frame 9.

The move from Frame 8 to Frame 9 is significant from a mechanical perspective.

The Frame 9 cabinet is approximately twice the width of the basic Frame 8 cabinet and has approximately twice the basic cabinet weight.

Therefore, upgrading from a D740-class installation to a D800-class installation may require mechanical planning in addition to electrical considerations.

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10. Five Recommended Related Models

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

These five models are particularly relevant when the application is being designed around large 480 VAC motors.

The D710 and D740 are useful when the required current remains within the Frame 8 range.

The D800 moves the application into Frame 9, while the D960 and D1K0 provide progressively greater capacity for larger motors.

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11. Five Representative Same-Brand Models

The following five models provide a useful comparison across smaller and medium-power drive applications.

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 cover a completely different power range from the 20G1G3D800LNDNNNNN.

The smaller PowerFlex models are better suited to compact machines and lower-power motors, while the PowerFlex 753 and 755 families are intended for more demanding industrial applications.

The purpose of including these models is to show the range of available drive architectures rather than to suggest that they are direct replacements for the 20G1G3D800LNDNNNNN.

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12. PowerFlex 755 Frame 9 High-Power Range

The Frame 9 range is particularly useful when the motor application exceeds the practical capacity of the Frame 8 models.

Model	Voltage	Approx. Normal Duty HP	Approx. Heavy Duty HP	Frame	Approx. Width	Approx. Weight
20G1G3D800LNDNNNNN	480 VAC	700 hp	600 hp	9	1200 mm	~1246 kg
20G1G3D960LNDNNNNN	480 VAC	800 hp	700 hp	9	1200 mm	~1246 kg
20G1G3D1K0LNDNNNNN	480 VAC	900 hp	750 hp	9	1200 mm	~1246 kg
20G1G3D1K1LNDNNNNN	480 VAC	1000 hp	800 hp	9	1200 mm	~1246 kg
20G1G3D1K3LNDNNNNN	480 VAC	1100 hp	900 hp	9	1200 mm	~1246 kg

This progression makes it easier to match the drive to larger motor currents without immediately changing the overall drive family.

For a new project, engineers can therefore consider the motor’s actual full-load current and duty requirements and then move through the available current classes.

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13. Application Selection by Load Type

Application	Typical Load Type	Suitable Drive Consideration
Large centrifugal pump	Variable torque	Light/Normal Duty depending on motor and system
Large fan	Variable torque	Light Duty often applicable
Large blower	Variable torque	Light/Normal Duty depending on load
Conveyor	Constant torque	Normal/Heavy Duty consideration
Compressor	Process-dependent	Normal/Heavy Duty consideration
Mixer	Constant or variable torque	Heavy Duty may be required
Agitator	High starting torque possible	Heavy Duty consideration
Heavy material handling	Constant torque	Heavy Duty consideration
Large process machine	Application-dependent	Duty must be calculated
Large rotating equipment	Application-dependent	Motor current and overload determine selection

This table illustrates why horsepower alone is not sufficient when selecting a high-power variable-frequency drive.

A 700 hp motor does not automatically require the same drive rating in every application.

The mechanical load, starting torque, acceleration profile and overload requirements can change the required drive size.

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14. Installation Requirements

The physical installation of the 20G1G3D800LNDNNNNN requires more planning than a small cabinet-mounted drive.

The first consideration is floor space.

A standard Frame 9 IP20/NEMA/UL Type 1 MCC-style configuration is approximately 2453 mm high × 1200 mm wide × 600 or 800 mm deep.

The installation location must therefore provide sufficient room not only for the cabinet itself but also for electrical connection, service access and ventilation.

The second consideration is weight.

At approximately 1246 kg, the drive requires suitable lifting and transportation equipment.

The route from the receiving area to the final installation location should be evaluated in advance.

Door dimensions, floor transitions, elevators, lifting points and equipment-room access can become practical limitations for equipment of this size.

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15. Thermal Management

High-power drives generate considerable heat.

The ventilation system should be designed around the actual losses of the installed equipment and the environmental conditions.

The drive room should not be treated as an ordinary electrical cabinet area without considering heat generation.

Ambient temperature, airflow, dust, humidity and nearby heat-producing equipment can all affect the operating environment.

For a large Frame 9 drive, thermal management becomes particularly important because the equipment is normally part of a larger high-power installation.

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16. Electrical Installation

The electrical installation should be designed around the actual 800 A-class drive rating.

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

The motor cable system should also be considered carefully.

Long motor cables, high switching frequencies and improper grounding arrangements can create unwanted electrical effects.

The grounding system should provide a low-impedance path and should be designed as part of the complete drive and motor installation.

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17. Motor Selection

When selecting a motor for the 20G1G3D800LNDNNNNN, the most important starting point is the motor nameplate data.

The motor voltage should be compatible with the intended drive output.

The full-load current should be within the selected drive duty rating.

The application torque requirement should also be considered.

For example, a large centrifugal fan generally has a different torque requirement from a loaded conveyor.

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

This difference can affect whether Light Duty, Normal Duty or Heavy Duty sizing is appropriate.

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18. Communication and Control Integration

The PowerFlex 755 architecture can be integrated into larger industrial automation systems.

Depending on the configuration, communication options can provide the exchange of commands, references, operating status and diagnostic information.

This can be especially useful for large installations because the drive can become part of the central machine-control architecture.

For example, a process controller can provide a speed reference while receiving drive status and fault information.

This type of integration can simplify centralized monitoring and allow operating parameters to be managed from the main control system.

The exact communication functions depend on the configured hardware and should be confirmed for the specific catalog number.

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19. Feedback and Advanced Motor Control

Some high-power applications require more than basic open-loop speed control.

The PowerFlex 755 family can support feedback-oriented control configurations where the application requires more precise regulation.

This can be useful when load changes are significant or when maintaining a controlled speed under varying mechanical conditions is important.

The exact feedback functionality depends on the installed configuration and selected options.

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20. Maintenance Considerations

A high-power Frame 9 drive should be included in a planned maintenance program.

Cooling fans, electrical connections, cabinet ventilation and other serviceable components should be inspected according to the applicable maintenance schedule.

Dust accumulation should be controlled because restricted airflow can increase operating temperature.

Electrical connections should also be checked periodically according to the applicable maintenance procedures.

Because the equipment is large and carries high electrical energy, maintenance should only be performed by appropriately trained personnel following the required isolation and safety procedures.

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21. Why the 20G1G3D800LNDNNNNN Is Used for High-Power Applications

The 20G1G3D800LNDNNNNN occupies an important position between large Frame 8 drives and even higher-capacity Frame 9 configurations.

Its approximately 700 hp Normal Duty capability makes it appropriate for many large industrial motors.

At the same time, the Frame 9 cabinet provides the physical and electrical architecture required for high-power installations.

This combination makes the model particularly relevant to industrial plants where large motors operate continuously or where the process requires controlled variable-speed operation.

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22. Key Advantages at a Glance

Advantage	Description
High current capacity	Suitable for large industrial motors
800 A class	Provides substantial output-current capability
Frame 9 design	Intended for large high-power installations
Multiple duty classes	Supports different load characteristics
Large motor capability	Approximately 600–800 hp depending on duty
Variable-speed operation	Allows motor speed to follow process requirements
Controlled acceleration	Reduces abrupt starting stress
Controlled deceleration	Provides controlled stopping behavior
Flexible architecture	Supports different control and interface configurations
Industrial integration	Suitable for integration into larger automation systems
Scalable family	Related models cover a broad range of motor sizes
High-power applications	Suitable for pumps, fans, conveyors, compressors and process machinery

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23. Overall Product Summary

The Allen-Bradley 20G1G3D800LNDNNNNN is a high-power PowerFlex 755 AC variable frequency drive designed for large industrial motor applications.

It belongs to the PowerFlex 755 series and uses a 480 VAC, Frame 9 architecture.

The model is in the 800 A-class range, with approximately 800 hp Light Duty, 700 hp Normal Duty and 600 hp Heavy Duty motor capability.

Its standard IP20 / NEMA / UL Type 1 MCC-style Frame 9 cabinet is approximately 2453 mm high × 1200 mm wide × 600 or 800 mm deep, with an approximate basic weight of 1246 kg.

These dimensions and weight make it a substantial industrial installation rather than a conventional compact VFD.

The model is particularly suited to large pumps, fans, blowers, compressors, conveyors, material-handling systems, mixers, process machinery and other high-power motor-driven equipment.

Its major strengths are its high current capacity, large motor capability, flexible duty ratings, variable-speed control, controlled acceleration and deceleration, and ability to be integrated into a larger industrial control system.

For applications where a 700 hp-class Normal Duty motor is required at 480 VAC, the 20G1G3D800LNDNNNNN represents a high-capacity PowerFlex 755 configuration.

When selecting the drive for an actual machine, the final decision should be based on the motor’s nameplate current, voltage, duty cycle, overload requirements, acceleration requirements, ambient conditions, enclosure requirements and required options rather than horsepower alone.

For replacement projects, the complete catalog number should also be retained because the individual catalog characters can define important configuration details.