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20G1F4D1K3LNDNNNNN – PowerFlex 755 High-Power AC Drive
Product Overview
The 20G1F4D1K3LNDNNNNN is a high-power industrial AC drive belonging to the PowerFlex 755 series. It is an air-cooled packaged-drive configuration intended for large industrial motor-control applications where high current capacity, controlled motor operation, adjustable speed, and integration with a plant automation system are required.
This model is designed for large-scale industrial equipment rather than compact machine applications. It is suitable for demanding motor-driven systems such as large conveyors, pumps, fans, compressors, material-handling equipment, process machinery, mining equipment, cement equipment, and other heavy-duty rotating machinery.
The catalog designation identifies the product as an Air-Cooled 755 AC Packaged Drive. The D1K3 configuration belongs to the very-high-current section of the PowerFlex 755 family, making it appropriate for applications where the motor and mechanical load require substantially more electrical capacity than conventional medium-size drives.
Because this is a large packaged drive, the equipment should be considered as part of a complete electrical and mechanical system. Incoming power, motor selection, cable sizing, grounding, cooling, cabinet ventilation, installation space, lifting requirements, and automation communication all need to be considered during project engineering.
Brand and Product Series
| Item | Details |
|---|---|
| Model | 20G1F4D1K3LNDNNNNN |
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Product Family | PowerFlex 755 AC Drives |
| Product Type | High-Power AC Drive |
| Configuration | Air-Cooled Packaged Drive |
| Application Class | Large Industrial Motor Control |
| Installation Type | Floor-Mounted / Cabinet-Type Installation |
| Cooling | Forced-Air / Air-Cooled |
The 20G1F4D1K3LNDNNNNN is listed as an Air-Cooled 755 AC Packaged Drive, and the same model family includes other high-power configurations with different current and voltage arrangements.
Basic Product Parameters
| Parameter | Specification |
|---|---|
| Model Number | 20G1F4D1K3LNDNNNNN |
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Product Type | High-Power Variable-Frequency AC Drive |
| Package Type | Air-Cooled Packaged Drive |
| Input Voltage Class | 400 V AC class |
| Input Phase | 3 Phase |
| Current Class | Approximately 1,300 A class |
| Cooling Method | Forced-Air |
| Cooling Type | Air-Cooled |
| Mounting | Floor-Mounted |
| Cabinet Arrangement | Industrial Packaged Cabinet |
| Motor Type | Large Industrial AC Motor |
| Motor Control | Adjustable-Frequency AC Motor Control |
| Speed Control | Variable-Speed |
| Acceleration | Programmable |
| Deceleration | Programmable |
| Industrial Integration | Suitable for plant automation integration |
| Typical Duty | Heavy Industrial / Continuous Operation |
| Typical Loads | Large Conveyors, Pumps, Fans, Compressors, Process Equipment |
| Approx. Height | 2477 mm |
| Approx. Width | 800 mm |
| Approx. Depth | 800 mm |
| Approx. Dimensions | 2477 × 800 × 800 mm |
| Approx. Weight | 700–800 kg |
| Installation Environment | Industrial Electrical Room |
| Cooling Requirement | Adequate Forced-Air Ventilation |
| Maintenance Requirement | Periodic Electrical and Cooling-System Inspection |
Important: The dimensions and weight above are engineering planning values for a large packaged configuration. The final physical dimensions and shipping weight can vary according to cabinet construction, selected options, disconnect equipment, auxiliary components, cooling arrangement, and other factory configuration details.
Detailed Technical Specification
| Technical Item | 20G1F4D1K3LNDNNNNN |
|---|---|
| Catalog Number | 20G1F4D1K3LNDNNNNN |
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Drive Category | High-Power AC Drive |
| Configuration | Air-Cooled Packaged Drive |
| Voltage Class | 400 V AC class |
| Supply | 3-Phase AC |
| Output Current Class | Approximately 1,300 A |
| Cooling | Forced-Air |
| Installation | Floor Mount |
| Cabinet Form | Packaged Industrial Cabinet |
| Motor Application | Large AC Motors |
| Control Principle | Variable-Frequency Motor Control |
| Speed Regulation | Adjustable-Speed Operation |
| Acceleration Control | Programmable |
| Deceleration Control | Programmable |
| Torque Management | Drive-Based Torque Control Functions |
| Automation Integration | Suitable for Industrial Control Systems |
| Typical Environment | Industrial Electrical Room |
| Approximate Height | 2477 mm |
| Approximate Width | 800 mm |
| Approximate Depth | 800 mm |
| Approximate Overall Size | 2477 × 800 × 800 mm |
| Approximate Weight | 700–800 kg |
| Airflow | Forced-Air Cooling |
| Mechanical Installation | Anchored Floor Installation |
| Service Requirement | Adequate Front and Equipment Access |
| Main Applications | Conveyors, Pumps, Fans, Compressors, Process Equipment |
| Duty | Heavy Industrial |
Product Introduction
The 20G1F4D1K3LNDNNNNN is designed for applications that require a very large-capacity motor-control system.
A drive in this class is normally used where the connected motor is a major electrical load in the facility. The equipment therefore requires considerably more planning than a small or medium variable-frequency drive.
The drive regulates the electrical power supplied to the motor and allows the motor to operate at a controlled speed rather than simply running at one fixed speed.
This is valuable for large mechanical systems because motor speed can be coordinated with the actual production requirement.
For example, a long conveyor may need a controlled startup to prevent mechanical shock. A large pump may need different operating speeds depending on flow demand. A fan may need to adjust airflow according to process conditions. A compressor may require controlled acceleration and carefully managed operating speed.
The drive provides the electrical control platform required for these applications.
High-Power Drive Architecture
The D1K3 configuration represents a very-high-current class within the PowerFlex 755 family.
At this level, the drive is intended for large industrial motors and high-power machinery.
The actual motor power that can be controlled depends on the motor voltage and current rather than on the catalog current designation alone.
For this reason, the correct selection procedure should begin with the motor nameplate and application duty.
Important motor information includes:
- Rated voltage
- Rated current
- Rated frequency
- Rated speed
- Rated power
- Power factor
- Efficiency
- Service factor
- Overload requirement
- Operating speed range
- Cooling method
- Load torque
A motor with a high nominal horsepower rating is not automatically suitable simply because the drive current appears sufficient. The motor’s actual current and the application’s overload requirements must be checked.
Air-Cooled Packaged Drive Construction
The LNDNNNNN configuration is associated with an air-cooled packaged arrangement.
At very high power levels, heat management becomes an important part of system design.
Power semiconductor devices and other electrical components produce heat during operation. The cooling system must continuously transfer this heat away from the electrical equipment.
The installation room therefore needs sufficient ventilation.
The cooling system should not be obstructed, and hot exhaust air should not be allowed to circulate back toward the cooling intake.
The equipment room should also be maintained within the permitted ambient temperature range.
Variable-Speed Operation
Variable-speed operation is one of the most important functions of the 20G1F4D1K3LNDNNN.
A motor connected directly to a fixed-frequency power supply generally operates at a relatively fixed speed.
With a variable-frequency drive, the motor speed can be adjusted according to the production requirement.
This provides considerable flexibility.
A pump can change speed according to flow or pressure demand.
A fan can change speed according to airflow requirements.
A conveyor can adjust its speed according to production throughput.
A process machine can synchronize its motor speed with another machine.
A compressor can operate within an appropriate variable-speed range according to process demand.
Controlled Acceleration
Large industrial machinery can contain substantial mechanical inertia.
A conveyor belt can be extremely long and heavy.
A large fan can have a high rotational inertia.
A crusher or processing machine can impose a significant mechanical load during startup.
Starting such equipment without appropriate control can create sudden stress on the mechanical transmission.
A variable-frequency drive allows acceleration to be programmed.
The motor can gradually increase its speed until it reaches the required operating condition.
This can provide smoother machine startup and reduce unnecessary mechanical shock.
Controlled Deceleration
Controlled stopping is also important for high-power equipment.
Large rotating machines can store considerable kinetic energy during operation.
When the machine needs to stop, the drive can follow a programmed deceleration profile.
The correct stopping method depends on the machine inertia, stopping time, motor characteristics, mechanical braking arrangement, and overall system design.
For high-inertia machinery, the deceleration strategy should be established during application engineering rather than selected only from a standard motor parameter.
Industrial Automation Integration
The PowerFlex 755 platform is designed for integration into industrial automation systems.
The 20G1F4D1K3LNDNNNNN can therefore be incorporated into a larger control architecture containing:
- PLC controllers
- Human-machine interfaces
- Industrial communication networks
- Process instrumentation
- Supervisory control systems
- Motor-control systems
- Safety equipment
- Production monitoring systems
This allows the drive to become part of the overall machine-control sequence.
For example, a PLC can issue a speed command to a conveyor drive according to production requirements.
A pump drive can be coordinated with process-pressure feedback.
A fan can respond to temperature or airflow conditions.
A production machine can synchronize multiple large motors through coordinated control.
Product Applications
Large Conveyor Systems
Large conveyors are one of the most common application areas for high-power motor drives.
Mining conveyors, bulk-material conveyors, cement conveyors, steel-plant conveyors, and port-handling systems can involve very large motors.
The 20G1F4D1K3LNDNNNNN can be considered when the motor current and application duty are within the drive’s configured capability.
Typical applications include:
- Mining conveyors
- Ore conveyors
- Coal conveyors
- Bulk-material conveyors
- Stockpile conveyors
- Transfer conveyors
- Crusher-feed conveyors
A controlled acceleration profile can help reduce stress on belts, couplings, gearboxes, shafts, and other mechanical components.
Mining Equipment
Mining systems often use very large motors.
The drive can be considered for:
- Long belt conveyors
- Crushers
- Feeders
- Pumps
- Ventilation fans
- Material-transfer systems
- Processing machinery
Mining applications can be demanding because the load may change considerably during operation.
The final drive selection should consider overload conditions, ambient temperature, dust, cooling, motor current, and the complete duty cycle.
Cement Production Equipment
Cement plants contain many large motor-driven machines.
Potential applications include:
- Raw-material conveyors
- Crushers
- Large fans
- Blowers
- Pumps
- Material-handling equipment
- Process machinery
Variable-speed control can allow equipment speed to be matched more closely to production requirements.
Steel and Metal Processing
Steel plants can use high-power motors throughout the production process.
Potential applications include:
- Large conveyors
- Cooling fans
- Process pumps
- Material-handling equipment
- Large rotating machinery
- Production-line equipment
- Process ventilation
The drive can be integrated into the larger control system to coordinate motor operation with production equipment.
Large Pumps
Large industrial pumps may require very high motor current.
The drive can provide adjustable speed so that pump operation can be matched to process demand.
Potential applications include:
- Cooling-water circulation
- Industrial water systems
- Water treatment
- Process fluid transfer
- Utility systems
- Large circulation systems
Pump selection should consider the pump curve, system head, required flow, minimum flow, motor current, and allowable operating speed.
Large Fans and Blowers
Large fans can contain significant rotating inertia.
The drive can provide controlled acceleration and adjustable operating speed.
Typical applications include:
- Industrial ventilation
- Furnace fans
- Process exhaust
- Combustion-air systems
- Cement-plant ventilation
- Steel-plant ventilation
- Mining ventilation
Variable-speed operation allows airflow to be adjusted without necessarily operating the motor continuously at full speed.
Compressors
Large compressors can require substantial starting and operating current.
A properly configured high-power drive can provide controlled motor starting and variable-speed operation.
Potential applications include:
- Industrial air compressors
- Process gas systems
- Manufacturing utilities
- Large process compressors
- Industrial cooling systems
The compressor manufacturer’s permitted speed range and load profile should always be considered.
Heavy Material Handling
Large material-handling systems can require high motor torque and substantial electrical capacity.
Potential applications include:
- Transfer conveyors
- Bulk-material handling
- Feed systems
- Heavy-duty production equipment
- Large lifting machinery
- Industrial transport systems
Controlled acceleration can be useful where the mechanical system needs to start smoothly under load.
Process Machinery
Large process machines often require speed coordination.
The drive can be connected to a plant automation system so that motor speed changes according to process conditions.
Potential applications include:
- Mixing equipment
- Large rotating machinery
- Continuous production lines
- Processing equipment
- Industrial production machinery
Main Product Advantages
High Current Capacity
The approximately 1,300 A class provides substantial electrical capacity for large industrial motors.
This makes the model suitable for large-scale machinery where smaller drive platforms are not adequate.
Large Motor Compatibility
The drive is intended for high-power AC motor applications.
The final motor selection must still be based on actual motor current, voltage, duty cycle, and application requirements.
Controlled Starting
The drive can provide a programmed acceleration profile.
This can reduce sudden mechanical loading during startup and provide a smoother transition to operating speed.
Adjustable Speed
Motor speed can be adjusted according to the actual production requirement.
This is useful for conveyors, pumps, fans, compressors, and process machinery.
Controlled Deceleration
The drive can provide a controlled stopping profile.
This is especially useful for machinery with high rotational inertia.
Industrial Automation Integration
The PowerFlex 755 platform can be integrated into industrial automation architectures.
This allows the drive to exchange commands and operating information with the wider control system.
Air-Cooled Construction
Forced-air cooling provides a practical method of thermal management for high-power equipment.
Correct ventilation and cooling maintenance are essential for reliable operation.
Packaged Cabinet Construction
The packaged configuration is suitable for dedicated industrial electrical rooms and large equipment installations.
It provides a structured arrangement for the high-power electrical equipment instead of requiring the complete drive system to be assembled from numerous individual components in the field.
Installation Considerations
The 20G1F4D1K3LNDNNNNN should be treated as a major electrical installation.
The following areas should be evaluated before commissioning.
Incoming Power System
The incoming electrical system should be checked for:
- Transformer capacity
- Switchgear rating
- Circuit protection
- Disconnect requirements
- Grounding
- Cable capacity
- Short-circuit conditions
- Electrical distribution capacity
The incoming supply must be appropriate for the complete drive configuration and connected motor load.
Motor Selection
The motor should be selected according to actual operating requirements.
| Motor Parameter | Engineering Requirement |
|---|---|
| Rated Voltage | Must be compatible with the drive system |
| Rated Current | Must be within the selected drive capability |
| Rated Frequency | Must match the application |
| Rated Speed | Required for motor-control setup |
| Rated Power | Used for system sizing |
| Power Factor | Required for motor data |
| Overload Requirement | Must match actual duty |
| Operating Speed | Must remain within motor limits |
| Cooling | Must be adequate over the operating speed range |
| Load Torque | Must be compatible with drive capability |
The motor’s nameplate current is one of the most important values for final drive selection.
Mechanical Installation
The 20G1F4D1K3LNDNNNNN is a large cabinet-type drive and can weigh several hundred kilograms.
For preliminary planning, an approximate equipment weight of 700–800 kg can be used.
The actual shipping weight should be confirmed before:
- Transportation
- Lifting
- Foundation design
- Floor loading calculations
- Cabinet anchoring
- Installation planning
- Rigging
The installation route should also be checked for doorway height, doorway width, turning radius, floor capacity, and lifting-equipment access.
Cooling and Ventilation
The air-cooled design requires adequate airflow.
The installation area should be designed so that:
- Cooling air can enter freely.
- Exhaust air can leave the equipment area.
- Hot air is not recirculated.
- Ambient temperature remains within the permitted range.
- Cooling fans remain accessible for maintenance.
- Dust accumulation is controlled.
The actual ventilation requirement should be based on the final configured drive and installation environment.
Maintenance
Regular maintenance helps maintain reliable operation of a high-power drive.
| Maintenance Area | Recommended Inspection |
|---|---|
| Cooling Fans | Check rotation, noise and airflow |
| Airflow Path | Check for blockage |
| Cabinet Interior | Inspect for dust and contamination |
| Power Connections | Check for overheating or looseness |
| Control Connections | Inspect wiring and terminals |
| Grounding | Verify grounding integrity |
| Drive Alarms | Review historical alarms |
| Fault History | Check recurring faults |
| Ventilation | Verify room airflow |
| Electrical Components | Check for abnormal temperature |
| Mechanical Condition | Check vibration and unusual noise |
| Cabinet Structure | Inspect doors, seals and mounting points |
The cooling system deserves particular attention because thermal stress is one of the important operating considerations for high-power electrical equipment.
Recommended Related Models – Same Series
The following models are closely related PowerFlex 755 configurations and provide useful comparison points around the high-current range.
| Related Model | Series | Approx. Current Class | Configuration | Typical Application |
|---|---|---|---|---|
| 20G1F4D1K0LNDNNNNN | PowerFlex 755 | 1,000 A class | Air-Cooled Packaged | Large industrial motors |
| 20G1F4D1K1LNDNNNNN | PowerFlex 755 | 1,100 A class | Air-Cooled | High-power process equipment |
| 20G1F4D1K3LNDNNNNN | PowerFlex 755 | 1,300 A class | Air-Cooled Packaged | Very large industrial motors |
| 20G1F4D1K4LNDNNNNN | PowerFlex 755 | 1,400 A class | Air-Cooled | Very-high-power machinery |
| 20G1F4D1K6LNDNNNNN | PowerFlex 755 | 1,600 A class | Air-Cooled | Extra-high-power industrial systems |
The model family includes multiple high-power configurations around the D1K0, D1K1, D1K3, D1K4 and D1K6 ranges. Exact electrical ratings and option combinations should be checked against the individual catalog number before substitution.
Five Related Models from the Same Brand
| Model | Product Family | Current Class | Cooling / Configuration | Typical Use |
|---|---|---|---|---|
| 20G1F4C920LNDNNNNN | PowerFlex 755 | 920 A class | Air-Cooled Packaged | Large pumps and conveyors |
| 20G1F4D1K0LNDNNNNN | PowerFlex 755 | 1,000 A class | Air-Cooled Packaged | Large industrial motors |
| 20G1F4D1K1LNDNNNNN | PowerFlex 755 | 1,100 A class | Air-Cooled | Heavy process machinery |
| 20G1F4D1K3LNDNNNNN | PowerFlex 755 | 1,300 A class | Air-Cooled Packaged | Very large motor systems |
| 20G1F4D1K6LNDNNNNN | PowerFlex 755 | 1,600 A class | Air-Cooled | Extra-high-power applications |
These models are useful when a project needs a different current capacity while retaining the same general high-power PowerFlex 755 platform.
Model Comparison
| Model | Current Class | Voltage Class | Cooling | General Application |
|---|---|---|---|---|
| 20G1F4C920LNDNNNNN | 920 A class | 400 V AC class | Air-Cooled | Large industrial machinery |
| 20G1F4D1K0LNDNNNNN | 1,000 A class | 400 V AC class | Air-Cooled | Large motor systems |
| 20G1F4D1K1LNDNNNNN | 1,100 A class | 400 V AC class | Air-Cooled | High-power process equipment |
| 20G1F4D1K3LNDNNNNN | 1,300 A class | 400 V AC class | Air-Cooled | Very large industrial motors |
| 20G1F4D1K6LNDNNNNN | 1,600 A class | 400 V AC class | Air-Cooled | Extra-high-power machinery |
Typical System Architecture
A large installation using this type of drive can be arranged around the following structure:
Incoming AC Supply
↓
Main Switchgear
↓
Protection and Disconnect Equipment
↓
20G1F4D1K3LNDNNNNN
↓
Large AC Motor
↓
Gearbox / Coupling
↓
Mechanical Load
The drive can simultaneously form part of the plant automation system:
PLC / Control System
↓
Industrial Communication
↓
PowerFlex 755 Drive
↓
Motor
↓
Process Equipment
This arrangement allows the motor to be controlled according to the overall production sequence.
Application Selection Guide
| Application | Main Requirement | Application Consideration |
|---|---|---|
| Mining Conveyor | High current and high mechanical load | Check continuous and overload current |
| Cement Conveyor | Controlled acceleration | Check belt inertia and gearbox |
| Large Pump | Variable flow | Check pump curve and minimum speed |
| Large Fan | High inertia | Check acceleration and ventilation |
| Compressor | High starting torque | Check compressor operating envelope |
| Crusher | Heavy starting load | Check overload and acceleration requirements |
| Material Handling | Controlled speed | Check mechanical load profile |
| Process Machinery | Variable speed | Check process speed range |
| Steel Equipment | High-power coordinated operation | Check automation integration |
| Large Rotating Machine | High motor current | Check motor thermal and mechanical limits |
Engineering Advantages
For a system integrator, the 20G1F4D1K3LNDNNNNN provides a high-power drive platform that can be incorporated into a larger automation architecture.
A plant may contain multiple large motors with different current requirements. Using closely related drive configurations can simplify engineering documentation, control strategies, parameter management, operator training, and maintenance procedures.
For maintenance teams, a consistent drive family can also make troubleshooting more familiar because the overall control philosophy remains similar across different drive ratings.
For plant operators, adjustable motor speed provides additional flexibility when production conditions change.
For mechanical systems, controlled acceleration and deceleration can provide a smoother operating profile compared with uncontrolled motor starting and stopping.
Final Technical Specification Table
| Specification | Details |
|---|---|
| Model | 20G1F4D1K3LNDNNNNN |
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Product Type | High-Power AC Drive |
| Configuration | Air-Cooled Packaged Drive |
| Input Voltage Class | 400 V AC class |
| Input Phase | 3 Phase |
| Current Class | Approximately 1,300 A |
| Cooling | Forced-Air / Air-Cooled |
| Mounting | Floor-Mounted Cabinet |
| Product Application | Large Industrial Motor Control |
| Motor Type | Large AC Industrial Motor |
| Control | Variable-Frequency Motor Control |
| Speed | Adjustable |
| Acceleration | Programmable |
| Deceleration | Programmable |
| Industrial Integration | Suitable for PLC and plant automation systems |
| Typical Loads | Conveyors, Pumps, Fans, Compressors |
| Heavy-Duty Applications | Mining, Cement, Steel, Material Handling |
| Approx. Height | 2477 mm |
| Approx. Width | 800 mm |
| Approx. Depth | 800 mm |
| Approx. Dimensions | 2477 × 800 × 800 mm |
| Approx. Weight | 700–800 kg |
| Installation Environment | Industrial Electrical Room |
| Cooling Requirement | Adequate Forced-Air Ventilation |
| Maintenance | Regular Electrical and Cooling Inspection |
| Main Application | Very-High-Power Industrial Motor Control |
Conclusion
The 20G1F4D1K3LNDNNNNN is a very-high-power PowerFlex 755 AC drive designed for large industrial motor-control applications.
Its approximately 1,300 A class configuration places it in the high-capacity range of the PowerFlex 755 family, making it suitable for large conveyors, mining machinery, cement equipment, steel-processing systems, pumps, fans, compressors, material-handling equipment, and other large rotating machines.
The air-cooled packaged configuration is intended for dedicated industrial installations where electrical distribution, cooling, mechanical support, cable routing, grounding, and automation integration are engineered together.
The main functional characteristics include high-current motor control, variable-speed operation, controlled acceleration, controlled deceleration, and integration into industrial automation systems.
For large mechanical equipment, these functions provide a way to coordinate motor operation with actual process requirements while maintaining a controlled operating profile.
The approximate 2477 × 800 × 800 mm dimensions and 700–800 kg weight should be used only for preliminary engineering, space planning, and installation assessment. The actual configured cabinet dimensions and shipping weight should be verified before transportation, lifting, floor-loading calculations, foundation work, and final installation.