Allen-Bradley 20G1D3D1K3LNANNNNN PowerFlex 755 AC Drive

Product Overview

The Allen-Bradley 20G1D3D1K3LNANNNNN is a high-power PowerFlex 755 AC drive designed for demanding industrial motor-control applications where very high current capacity, substantial horsepower capability, and floor-mounted construction are required.

This model belongs to the PowerFlex 755 family and is configured as an air-cooled, floor-mounted AC drive for 480 VAC three-phase systems. It is rated at approximately 1,365 A, with a Normal Duty rating of 1,100 HP and a Heavy Duty rating of 900 HP.

The unit uses a large Frame 9C construction and is intended for large industrial installations rather than compact machine-level applications. Its physical size, electrical capacity, and floor-mounted architecture make it particularly appropriate for large motors, centralized drive rooms, process equipment, and heavy industrial production systems.

The model is identified as an air-cooled PowerFlex 755 AC packaged drive with a common-bus inverter and precharge arrangement. The configuration uses a Type 1/IP21 enclosure arrangement and is designed for floor mounting.

For projects where cabinet dimensions, transportation routes, lifting equipment, cable-entry arrangements, or replacement compatibility are important, the physical installation requirements should be considered together with the electrical rating. This is a large industrial drive and should not be treated like a conventional wall-mounted or small cabinet-mounted variable frequency drive.

Basic Product Identification

Detailed Electrical Parameters

The 20G1D3D1K3LNANNNNN is built around a 480 VAC three-phase electrical system and provides a very high current rating of approximately 1,365 A.

This current capacity places the unit in the high-power range of the PowerFlex 755 family. The drive is suitable for applications in which a conventional low- or medium-capacity variable frequency drive would not provide sufficient current capacity for the connected motor.

The Normal Duty rating is approximately 1,100 HP, while the Heavy Duty rating is approximately 900 HP. The distinction between Normal Duty and Heavy Duty is important when selecting the drive for a specific process.

Normal Duty applications generally correspond to systems with comparatively moderate overload requirements, while Heavy Duty operation is intended for applications that impose greater torque demand or more severe operating conditions. Motor nameplate current, starting characteristics, load profile, acceleration requirements, overload requirements, and process duty should all be evaluated before final selection.

The drive uses a common-bus inverter configuration with precharge. This type of architecture is particularly useful in large industrial systems where multiple drive sections or common DC-bus arrangements are part of the overall electrical design.

Mechanical Construction

The Frame 9C construction reflects the high-power nature of this drive.

Unlike small PowerFlex drives that can be installed directly into compact control cabinets, this class of equipment is normally integrated into a dedicated floor-mounted electrical arrangement.

The approximate planning envelope is around 1,800 mm high, 900 mm wide, and 800 mm deep. These dimensions should be regarded as installation-planning values rather than a substitute for the mechanical drawing of the exact supplied configuration.

The total weight can be approximately 1,500 kg depending on the particular packaged configuration and associated components. Because of this substantial weight, installation normally requires appropriate lifting equipment, a suitable foundation or floor structure, and a carefully planned transportation route.

The large enclosure also provides room for high-current power connections, cooling airflow, control equipment, protective components, and other elements associated with a high-power drive system.

Product Introduction

The Allen-Bradley 20G1D3D1K3LNANNNNN is designed for industrial applications where the motor power is measured in hundreds or more than one thousand horsepower.

Its 480 VAC three-phase input architecture makes it suitable for industrial power-distribution systems commonly used in large manufacturing facilities, processing plants, utility systems, material-handling installations, and heavy machinery.

The PowerFlex 755 platform is designed around a modular industrial drive concept, allowing high-power drive systems to be integrated into larger automation architectures.

At this power level, the drive is not simply a motor-speed controller. It becomes an important part of the plant’s overall electrical and automation infrastructure.

The 20G1D3D1K3LNANNNNN can therefore be considered a large-system drive intended to coordinate high-power motor operation while providing controlled acceleration, deceleration, speed regulation, torque control, and process-oriented motor management.

Its air-cooled design avoids the need for a liquid cooling circuit, simplifying the cooling concept compared with liquid-cooled high-power drive systems. At the same time, sufficient ventilation and heat-management provisions are essential because a drive of this capacity can produce considerable heat during operation.

Main Product Advantages

1. Very High Current Capacity

The most obvious characteristic of the 20G1D3D1K3LNANNNNN is its approximately 1,365 A current rating.

This provides the electrical capacity required by very large motors and high-power industrial loads.

For applications involving large pumps, compressors, fans, conveyors, extruders, mills, hoists, and other high-power equipment, the available current capacity provides considerable operating headroom when the drive is correctly matched to the motor and process.

2. High Horsepower Capability

With approximately 1,100 HP Normal Duty and 900 HP Heavy Duty capability, this model is positioned for applications that are beyond the range of standard small and medium industrial drives.

The high horsepower rating makes the unit suitable for centralized motor-control systems where a single drive is responsible for a very large motor.

3. 480 VAC Three-Phase Architecture

The 480 VAC three-phase configuration is widely used in industrial power systems.

This makes the model suitable for large industrial facilities that already operate a 480 VAC distribution architecture, reducing the need for unusual input-power arrangements.

4. Common-Bus Inverter Configuration

The common-bus inverter architecture is useful in large drive systems where DC-bus power distribution forms part of the overall system design.

It can be particularly relevant when multiple drive sections are coordinated through a common electrical architecture.

This arrangement can also be useful in applications where system-level energy management and drive coordination are important considerations.

5. Precharge Function

The precharge arrangement helps manage the initial charging of the DC-link circuitry.

In a high-power drive, controlling the charging process is especially important because the DC-link capacitors represent a substantial electrical load during startup.

The precharge system therefore forms an important part of the drive’s high-power electrical architecture.

6. Air-Cooled Design

The air-cooled construction provides a practical method of removing operating heat without requiring a dedicated liquid-cooling circuit.

This can simplify the overall plant cooling infrastructure, although adequate ventilation, airflow management, and environmental control remain essential.

7. Floor-Mounted Construction

The floor-mounted design is appropriate for very large industrial drives.

It allows the equipment to be installed in a dedicated electrical room, drive room, motor-control area, or industrial equipment space where large cable connections and high-power equipment can be accommodated.

8. Type 1 / IP21 Construction

The Type 1/IP21 configuration provides a defined level of enclosure protection for indoor industrial installation.

The actual installation environment should still be evaluated carefully. Areas containing excessive dust, corrosive chemicals, conductive contaminants, moisture, or other harsh environmental conditions may require additional enclosure or environmental protection.

9. Large Industrial System Compatibility

The PowerFlex 755 family is intended for integration into sophisticated industrial automation systems.

This makes the 20G1D3D1K3LNANNNNN appropriate for plants where drive control needs to coexist with PLC systems, supervisory systems, instrumentation, process-control systems, and other industrial automation equipment.

Typical Applications

Heavy-Duty Pump Systems

Large pumps used in water treatment, chemical processing, mining, power generation, and industrial fluid handling can require hundreds or even more than one thousand horsepower.

The 20G1D3D1K3LNANNNNN can provide variable-speed control for these large pump motors, allowing process flow and pressure to be adjusted according to operating requirements.

Variable-speed control can also help reduce unnecessary mechanical stress associated with repeatedly starting and stopping large motors.

Large Fan and Blower Systems

Large industrial fans and blowers often operate continuously and may require substantial motor power.

Using a high-power variable frequency drive allows airflow to be adjusted according to actual process demand instead of running the motor continuously at full speed.

This can be valuable in ventilation, combustion-air systems, furnace systems, cement plants, steel production, and other process industries.

Mining Equipment

Mining equipment frequently operates under high mechanical loads and demanding environmental conditions.

Large conveyors, crushers, pumps, ventilation systems, mills, and material-handling systems can require high-power variable-speed motor control.

The large current capability of this model makes it suitable for high-power motor applications where precise acceleration and controlled speed operation are required.

Material Handling

Large conveyors and bulk-material handling systems often use high-horsepower motors.

The drive can provide controlled acceleration and deceleration, helping reduce mechanical shock to gearboxes, couplings, conveyor belts, and other mechanical components.

This is especially useful in long conveyors where sudden acceleration can create significant mechanical stress.

Cement and Mineral Processing

Cement plants, mineral-processing plants, and aggregate facilities contain numerous large motors.

Typical equipment includes crushers, mills, large fans, separators, conveyors, and pumps.

A high-power PowerFlex 755 drive can be incorporated into the motor-control architecture of these systems.

Steel and Metals Processing

Steel mills and metal-processing plants frequently use very large motors for rolling, conveying, pumping, ventilation, and other process functions.

The high current capability and industrial floor-mounted design make this class of drive suitable for centralized motor-control applications in such environments.

Oil and Gas Processing

Large compressors, pumps, fans, and process equipment may require high-power variable-speed control.

The 480 VAC architecture and high current capacity provide an option for industrial motor systems where the electrical infrastructure is designed around this voltage class.

Water and Wastewater Infrastructure

Large water-treatment and wastewater facilities use high-power pumping systems for water transfer, treatment, aeration, and sludge processing.

Variable-speed control can allow the motor operating point to follow process requirements more closely.

Large Industrial Compressors

Large compressors can have substantial starting torque and continuous power requirements.

A properly selected PowerFlex 755 drive can provide controlled acceleration, speed regulation, and process-oriented motor operation.

Final motor compatibility should always be evaluated using actual motor nameplate current and compressor load characteristics rather than horsepower alone.

Installation Considerations

Because this is a Frame 9C, floor-mounted high-power drive, installation planning is significantly more involved than for a compact drive.

The electrical room must provide sufficient floor space around the equipment for installation, inspection, cable termination, ventilation, maintenance, and safe working access.

The approximate 1,800 × 900 × 800 mm physical envelope should be used only for preliminary planning. The final equipment drawing should be used for actual foundation, cable-entry, clearance, and maintenance-space design.

The approximately 1,500 kg weight also requires appropriate handling equipment.

The supporting floor or foundation should be evaluated for the total installed weight rather than the drive enclosure alone.

Electrical connections also require careful planning because a 1,365 A drive involves very large conductors and substantial fault-current considerations.

The incoming power system, disconnecting equipment, protection, grounding, cable sizing, motor cable routing, and control wiring should be designed by qualified electrical personnel familiar with high-power variable frequency drive installations.

Operating Environment

The air-cooled design requires adequate airflow.

The installation area should provide sufficient ventilation to prevent excessive ambient temperature around the drive.

Airflow paths should not be obstructed, and the cooling system should be protected from excessive dust and contamination.

Where the drive is installed in a process environment containing corrosive gases, conductive dust, high humidity, or other contaminants, additional environmental protection may be necessary.

The Type 1/IP21 construction should therefore be considered in relation to the actual plant environment rather than treated as universal protection against all industrial conditions.

Product Selection Notes

When selecting the 20G1D3D1K3LNANNNNN, the motor nameplate should be reviewed carefully.

Important values include rated motor current, voltage, frequency, speed, power, service factor, overload requirement, starting torque, acceleration time, and the expected operating cycle.

The 1,100 HP Normal Duty and 900 HP Heavy Duty values should not be used as the only selection criteria.

For a pump or fan with relatively stable loading, the Normal Duty rating may be more representative.

For conveyors, crushers, mixers, hoists, compressors, or other applications with higher overload or torque requirements, the Heavy Duty rating and actual motor current become particularly important.

Model Number Configuration

The model number 20G1D3D1K3LNANNNNN represents a highly specific PowerFlex 755 configuration.

The configuration identifies the product as part of the high-power 480 VAC PowerFlex 755 family and differentiates it from other versions with different power architectures, voltage classes, enclosure arrangements, control options, filtering configurations, or accessories.

The “D3” family designation is associated with a high-power packaged-drive architecture, while the “K3” portion identifies a very high current class within this family.

The “L” configuration corresponds to the floor-mounted industrial arrangement represented by this product family, while the remaining characters identify control and option selections.

Because PowerFlex 755 model numbers can contain many option combinations, the complete model number should always be retained when replacing equipment.

Technical Specification Summary

Five Related Models in the Same PowerFlex 755 High-Power Family

The following models are closely related to the 20G1D3D1K3LNANNNNN and are useful when evaluating adjacent current classes, power levels, or alternative configurations.

*Dimensions and weight for the related high-power Frame 9C configurations are approximate planning values. Exact enclosure dimensions, cable-entry arrangements, internal equipment, and final shipping weight can vary with the complete configured package.

The models above are particularly useful when designing a system around a large motor because they provide neighboring configuration choices within the same high-power PowerFlex 755 architecture.

The exact current and horsepower values of the adjacent K0, K1, K4, and K6 variants should be checked against the complete nameplate or configuration documentation before using them for final engineering selection.

Five Popular Related Allen-Bradley Models

The following models represent other PowerFlex 755 configurations that are useful for comparison with the 20G1D3D1K3LNANNNNN.

*The 20G1D3C540LNANNNNN dimensions and weight are representative Frame 8 planning values; actual packaged configuration can vary.

These models provide useful reference points when comparing different current capacities within the PowerFlex 755 high-power product range.

The 20G1D3C models are particularly relevant when a project requires a lower current class than the 1,365 A 20G1D3D1K3LNANNNNN.

The 20G1D3D2K0LNANNNNN, on the other hand, represents a substantially higher current and horsepower class and may be considered where the motor rating exceeds the capacity of the 1,365 A model.

Application Comparison

Why This Model Is Different From Smaller PowerFlex Drives

The 20G1D3D1K3LNANNNNN belongs to a very different physical and electrical class than compact PowerFlex drives.

A small industrial drive may be mounted inside a standard control cabinet and handled by one or two technicians.

This model, by comparison, is a large floor-mounted system with an approximately 1,365 A current rating and a physical weight that can reach the range of a small industrial machine.

The engineering considerations therefore extend beyond the drive itself.

Power distribution, motor cable routing, ventilation, heat dissipation, floor loading, lifting arrangements, maintenance clearance, electrical protection, grounding, and plant automation integration all become significant parts of the installation.

This makes the model particularly appropriate for major industrial projects where the drive is treated as a central piece of electrical infrastructure.

Maintenance Considerations

High-power air-cooled drives require a structured maintenance program.

Cooling airflow should be kept clear, and air passages should be inspected periodically.

Dust accumulation can reduce cooling efficiency and increase operating temperature.

Electrical connections should be inspected according to the maintenance procedures applicable to the installed system.

High-current connections deserve particular attention because loose or degraded connections can result in increased resistance, localized heating, and eventual equipment damage.

The control section should also be protected from unnecessary contamination and environmental exposure.

Because the drive is a high-power floor-mounted system, maintenance planning should include safe access to the equipment and appropriate procedures for isolation and verification of the electrical system before service work begins.

Engineering Benefits

From a system-design perspective, the 20G1D3D1K3LNANNNNN offers several important benefits.

Its very high current capacity allows one drive platform to control extremely large motors without requiring multiple smaller drives simply to achieve the required current capacity.

Its common-bus inverter architecture is also valuable in applications where the drive must operate as part of a larger DC-bus system.

The floor-mounted Frame 9C construction is appropriate for centralized industrial electrical rooms where large drives can be installed in dedicated equipment areas.

The air-cooled design provides a relatively straightforward cooling approach for industrial plants that prefer to avoid dedicated liquid-cooling infrastructure.

The 480 VAC three-phase input also fits naturally into many industrial power-distribution systems.

Recommended Use Cases

The 20G1D3D1K3LNANNNNN is particularly appropriate when the project involves:

• A very large 480 VAC three-phase motor.
• A motor requiring approximately 1,365 A or a comparable drive current class.
• Normal Duty power requirements up to approximately 1,100 HP.
• Heavy Duty power requirements up to approximately 900 HP.
• A floor-mounted industrial drive installation.
• A common-bus inverter architecture.
• A precharge-equipped high-power drive system.
• Large pumps, fans, compressors, conveyors, mills, crushers, or other industrial machinery.
• A dedicated electrical room or large equipment area.
• Industrial automation systems requiring a PowerFlex 755 platform.

Selection and Replacement Guidance

When replacing an existing 20G1D3D1K3LNANNNNN, the complete model number should be matched rather than selecting a replacement based only on voltage and horsepower.

At this power level, apparently similar models can have different input architectures, filtering arrangements, braking functions, enclosure types, control options, cable-entry arrangements, and common-bus configurations.

The following items should be compared before approving a replacement:

1. Input voltage.
2. Number of phases.
3. Motor rated current.
4. Normal Duty current requirement.
5. Heavy Duty current requirement.
6. Motor horsepower.
7. Common-bus or standalone architecture.
8. Precharge arrangement.
9. Enclosure type.
10. Frame size.
11. Cooling arrangement.
12. EMC/filtering configuration.
13. Jumper configuration.
14. HIM and control configuration.
15. Cable-entry arrangement.
16. Communication requirements.
17. Physical dimensions.
18. Total equipment weight.
19. Floor-loading requirements.
20. Maintenance and service clearances.

A replacement drive should be evaluated using the actual motor nameplate and application duty rather than simply matching the old horsepower number.

Final Product Summary

The Allen-Bradley 20G1D3D1K3LNANNNNN is a high-capacity PowerFlex 755 AC drive intended for large industrial motor applications.

With a 480 VAC three-phase input, approximately 1,365 A current capability, 1,100 HP Normal Duty rating, and 900 HP Heavy Duty rating, it is positioned for applications requiring substantially more electrical capacity than conventional industrial variable frequency drives.

Its Frame 9C, floor-mounted, air-cooled construction is suited to dedicated industrial electrical rooms and large equipment installations.

The common-bus inverter with precharge configuration makes the model particularly relevant to high-power systems where the drive forms part of a larger DC-bus architecture.

The Type 1/IP21 enclosure arrangement provides a practical indoor industrial installation format, while the air-cooled design simplifies the cooling concept compared with liquid-cooled high-power systems.

For engineering purposes, the approximate 1,800 × 900 × 800 mm physical envelope and approximately 1,500 kg weight should be treated as planning values, with the final mechanical drawing used for actual installation and transportation planning.

Overall, the 20G1D3D1K3LNANNNNN is best understood as a large-scale industrial drive for high-horsepower motor control, centralized drive-room installations, and demanding process applications where current capacity, robust construction, controlled motor operation, and integration with a larger automation system are important requirements.