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20G1F4D960LNDNNNNN – PowerFlex 755 High-Power Air-Cooled AC Packaged Drive

Product Overview

The 20G1F4D960LNDNNNNN is a high-power air-cooled AC packaged drive in the PowerFlex 755 series.

It is designed for large industrial motor-control applications where substantial motor current, variable-speed operation, controlled acceleration and deceleration, and integration with an industrial automation system are required.

This model belongs to the high-power range of the PowerFlex 755 family and is intended for demanding machinery such as large conveyors, mining equipment, pumps, fans, compressors, material-handling systems, process machinery, and other large electrically driven equipment.

The product is identified as an Air Cooled 755 AC Packaged Drive. The catalog number is 20G1F4D960LNDNNNNN. Product listings also identify it as a 480 V AC operated variable-frequency drive configuration.

The 960 designation places this model in a very high current class within the PowerFlex 755 family. This makes it suitable for applications where the motor load is significantly larger than the typical compact VFD application.

The packaged cabinet construction is intended for industrial installations where the drive is installed as part of a dedicated electrical system rather than as a small wall-mounted component.

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Brand and Series

Item	Specification
Brand	Allen-Bradley
Series	PowerFlex 755
Model	20G1F4D960LNDNNNNN
Product Type	High-Power AC Drive
Package Type	Air-Cooled 755 AC Packaged Drive
Drive Category	Industrial Variable-Frequency AC Drive
Input Voltage	480 V AC class
Input Phase	3 Phase
Current Class	Approximately 960 A class
Cooling	Forced-Air / Air Cooled
Installation	Floor-Mounted / Packaged Cabinet
Application	High-Power Industrial Motor Control
Motor Control	Adjustable-Speed AC Motor Control
Main Use	Large Industrial Motors
Mounting Environment	Industrial Electrical Room / Drive Room

The PowerFlex 755 family contains a wide range of high-power AC drive configurations. Related catalog numbers include 505 A, 545 A, 617 A, 740 A, 800 A, 960 A, 1,000 A and higher-current configurations. This allows the same general drive family to be used across different motor sizes and machine requirements.

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Detailed Product Parameters

Parameter	Specification
Model Number	20G1F4D960LNDNNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product Description	Air-Cooled 755 AC Packaged Drive
Drive Type	High-Power Variable-Frequency AC Drive
Input Voltage	480 V AC class
Input Phase	3 Phase
Input Frequency	50/60 Hz class
Current Rating	Approximately 960 A class
Cooling Method	Forced-Air / Air Cooled
Installation	Floor Mounted
Package	Industrial Packaged Cabinet
Motor Control	Variable-Speed AC Motor Control
Application Class	High-Power Industrial
Feedback	Configuration dependent
Communication	Configuration dependent
Braking	Configuration dependent
Regenerative Function	Configuration dependent
Enclosure	Packaged Industrial Cabinet
Approx. Dimensions	Approx. 2477 × 800 × 800 mm (H × W × D)
Approx. Weight	Approx. 995 kg
Cooling Requirement	Adequate forced-air ventilation
Installation Environment	Industrial Electrical Room / Drive Room
Typical Motor Application	Large AC Motors
Typical Load	High-Inertia / Continuous-Duty Industrial Machinery

The exact product listing confirms the model as an air-cooled 755 AC packaged drive and identifies it as a 480 V AC operated variable-frequency drive.

The approximately 960 A designation should be understood as the model’s current class. Final motor selection should always be based on the actual motor nameplate current, duty requirement, overload profile, ambient conditions, and applicable drive rating information.

The dimensions and weight shown above are approximate engineering planning figures for this class of large packaged drive. The actual mechanical dimensions and shipping weight can vary according to cabinet construction, factory-installed options, disconnect equipment, control equipment, input components, braking equipment, and other configuration details.

For an actual installation, the final mechanical drawing should be used to confirm the exact height, width, depth, weight, cable-entry locations, lifting points, door clearances, and maintenance clearances.

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Product Introduction

The 20G1F4D960LNDNNNNN is designed for high-power motor-control applications where the motor requires a large amount of electrical current and the machine requires adjustable operating speed.

Large industrial motors are commonly used in applications where fixed-speed operation is not sufficient. A production process may require different motor speeds during startup, normal production, reduced-load operation, or shutdown.

A high-power variable-frequency drive provides the electrical interface between the incoming power supply and the motor.

The drive regulates the motor according to the commanded speed and operating conditions, allowing the machine-control system to manage the motor more precisely than a simple direct-on-line starter.

This becomes particularly important with large rotating equipment.

A large conveyor, fan, pump, compressor, or process machine can contain considerable mechanical inertia. Applying full power immediately can produce a significant mechanical response.

Controlled acceleration can provide a smoother transition from zero speed to operating speed.

Controlled deceleration can likewise provide a more predictable stopping process.

The packaged configuration of the 20G1F4D960LNDNNNNN makes it suitable for centralized electrical installations where large drive equipment is installed in a dedicated control or electrical room.

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High-Power Current Capability

The 960 A class places this model toward the high-current end of the PowerFlex 755 family.

This level of current capacity makes the drive suitable for large motors and heavy industrial loads.

It can be considered for machinery where a conventional compact variable-frequency drive would not provide sufficient current capacity.

Typical applications include large conveyors, large pumps, industrial fans, compressors, material-handling systems, and other heavy process equipment.

The actual motor horsepower or kilowatt capacity should not be determined from the current designation alone.

Motor voltage, full-load current, efficiency, power factor, overload requirements, acceleration time, operating temperature, altitude, duty cycle, and load characteristics all need to be considered.

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Air-Cooled Design

The 20G1F4D960LNDNNNNN is an air-cooled packaged drive.

High-power semiconductor devices generate substantial heat during operation.

The forced-air cooling system moves air through the drive’s cooling path to remove heat from the power electronics.

This approach is practical for large industrial installations where a properly designed electrical room or ventilation system is available.

The installation should provide adequate airflow around the equipment.

Cooling-air passages should remain unobstructed.

Dust accumulation, oil mist, moisture, corrosive gases, and excessive ambient temperatures should also be considered when designing the drive room.

A clean and properly ventilated installation environment can make a significant difference to the long-term operating condition of high-power electronic equipment.

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Packaged Cabinet Construction

The packaged construction is one of the important characteristics of this model.

A high-power drive requires considerably more physical space than a small general-purpose VFD.

The cabinet provides a dedicated structure for the drive power section, cooling system, electrical connections, control equipment, and associated components.

This makes the product suitable for centralized industrial installations.

Typical locations include:

• Main electrical rooms.
• Motor-control rooms.
• Drive rooms.
• Production plant electrical areas.
• Mining facilities.
• Cement plants.
• Steel plants.
• Large process facilities.
• Material-handling installations.

The cabinet should be installed with enough clearance for ventilation, inspection, maintenance, and safe access to electrical components.

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Main Product Applications

1. Large Conveyor Systems

Large conveyors are one of the most important applications for this class of high-power drive.

Mining conveyors, bulk-material conveyors, cement conveyors, aggregate conveyors, port conveyors, and large production conveyors can require very high motor power.

A variable-speed drive allows conveyor speed to be adjusted according to the material flow and production requirement.

Controlled acceleration is also useful when the conveyor belt, gearbox, drive pulley, and material load have substantial inertia.

Instead of immediately applying full speed, the drive can bring the system up to operating speed according to a programmed acceleration profile.

This can help reduce mechanical shock and improve the overall operating behavior of the conveyor system.

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2. Mining Equipment

Mining operations use large electric motors in many areas of the production process.

Typical equipment includes conveyors, crushers, feeders, pumps, fans, hoists, and material-handling systems.

These machines can operate under high loads for long periods.

A high-power drive can provide variable-speed operation and controlled motor starting where required.

Mining installations also require careful consideration of dust, ambient temperature, ventilation, enclosure protection, cable routing, and maintenance access.

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3. Cement and Aggregate Processing

Cement and aggregate plants use large motors for conveyors, crushers, fans, pumps, mills, feeders, and other production equipment.

Variable-speed control can allow the motor to match the actual process requirement.

Large fans can operate according to airflow demand.

Large pumps can operate according to flow or pressure requirements.

Conveyors can operate according to material throughput.

This flexibility makes high-power variable-frequency drives useful in many parts of a cement or aggregate production facility.

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4. Steel and Metal Processing

Large steel and metal-processing facilities often use high-power motors for rollers, conveyors, pumps, cooling systems, fans, material-handling equipment, and process machinery.

The drive can provide adjustable speed and controlled motor operation.

For automated production systems, the drive can also operate as part of a larger control architecture.

The final configuration must be selected according to the actual motor and mechanical process.

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5. Large Industrial Pumps

Large pumps can require substantial motor current, especially in water treatment, industrial cooling, process pumping, and utility systems.

A variable-speed drive allows pump speed to be adjusted according to actual process requirements.

The pump does not necessarily have to operate at full speed at all times.

This can improve process control and reduce unnecessary full-speed operation.

The motor, pump, piping system, operating pressure, minimum speed, and required flow range should all be evaluated when designing the complete system.

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6. Large Industrial Fans

Large fans and blowers are commonly found in cement plants, steel mills, mining operations, industrial ventilation systems, and process plants.

Fan speed can be adjusted according to the required airflow.

A high-power drive is particularly useful where the fan motor is large and the process requires variable airflow.

Large fans can also have significant rotational inertia, making controlled acceleration an important consideration.

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7. Compressors

Industrial compressors can require large motors and carefully controlled acceleration.

A high-power drive can regulate motor speed when the compressor design permits variable-speed operation.

The compressor manufacturer’s operating range should be followed carefully.

Minimum speed, maximum speed, acceleration time, load characteristics, cooling, and motor thermal limitations all need to be considered.

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8. Heavy Material Handling

Large material-handling systems may include transfer machines, feeders, cranes, hoists, conveyors, and other electrically driven equipment.

These systems can require high torque during acceleration.

The drive must be selected according to the actual load profile and braking requirements.

Hoist applications in particular may require specialized braking, feedback, or regenerative arrangements.

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Product Advantages

1. Very High Current Capacity

The approximately 960 A class provides substantial capacity for large industrial motors.

This makes the model appropriate for applications that require significantly more current than conventional compact drive products.

It is particularly useful for large continuous-duty machinery.

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2. Adjustable Motor Speed

Variable-frequency operation allows motor speed to be controlled according to the machine’s operating requirement.

This is useful for conveyors, pumps, fans, compressors, and process machinery.

Instead of relying exclusively on fixed-speed operation, the machine can operate at different speeds according to the production process.

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3. Controlled Acceleration

Large motors can create substantial electrical and mechanical demand during starting.

The drive allows the acceleration process to be controlled.

This is useful for high-inertia equipment because the motor and machine can move from zero speed to operating speed in a controlled manner.

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4. Controlled Deceleration

The drive can also provide controlled deceleration according to the selected configuration and application requirements.

This can be beneficial for large rotating machinery.

The exact stopping method depends on the mechanical load, inertia, braking system, and drive configuration.

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5. Suitable for High-Inertia Loads

Large conveyors, fans, compressors, pumps, and process machines may have significant rotating inertia.

The high-power drive architecture is suitable for applications where the motor needs considerable current during acceleration.

The final drive selection should still be checked against the actual acceleration time and load profile.

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6. Industrial Automation Integration

The PowerFlex 755 platform is intended for use in larger industrial automation systems.

Depending on the selected configuration, the drive can communicate with control equipment and provide operating data, status information, alarms, speed references, and other control parameters.

This allows the drive to operate as part of an integrated production system rather than as an isolated motor controller.

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7. Air-Cooled Maintenance Structure

Air cooling provides a straightforward approach to thermal management for high-power drive equipment when environmental conditions are appropriate.

There is no need to manage a liquid cooling loop in a standard air-cooled installation.

Maintenance attention can instead focus on cooling fans, airflow, cabinet cleanliness, electrical connections, and thermal conditions.

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8. Suitable for Centralized Drive Rooms

The packaged cabinet arrangement is well suited to centralized drive installations.

Multiple large drives can be installed in dedicated electrical areas with organized power distribution, control wiring, communication networks, and maintenance access.

This type of installation is common in large industrial facilities.

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Installation Considerations

The physical size and weight of the 20G1F4D960LNDNNNNN require careful installation planning.

The floor should have sufficient load-bearing capacity.

The equipment should be transported using an appropriate lifting and handling method.

The approximately 995 kg planning weight should be considered when arranging transportation, unloading, positioning, and installation.

The drive room should provide sufficient clearance around the cabinet.

There should be enough space to open cabinet doors and perform maintenance.

The cooling airflow should not be obstructed by nearby equipment.

Power cables, motor cables, control cables, grounding conductors, and communication cables should be routed according to the applicable installation requirements.

The final mechanical drawing should be used before preparing the foundation or cable-entry openings.

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Environmental Considerations

High-power air-cooled drives should be installed in a controlled industrial environment.

Ambient temperature should remain within the applicable operating range.

Excessive dust can restrict cooling airflow and increase maintenance requirements.

Oil mist and corrosive gases can affect electrical and electronic components.

High humidity and condensation should also be avoided.

Where the equipment is installed in a harsh environment, the overall enclosure and ventilation design should be considered together.

The drive should not be treated as an isolated component; the electrical room, ventilation system, motor, cabling, grounding, and control system all influence the final installation.

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Five Same-Series / Related Models

The following models are closely related high-power PowerFlex 755 configurations and can be used for comparison when selecting a drive around the 960 A class.

Model	Series	Approx. Current Class	Cooling	Product Type	Approx. Dimensions	Approx. Weight
20G1F4D740LNDNNNNN	PowerFlex 755	740 A	Air cooled	AC Packaged Drive	Configuration dependent	Configuration dependent
20G1F4D800LNDNNNNN	PowerFlex 755	800 A	Air cooled	AC Packaged Drive	Configuration dependent	Configuration dependent
20G1F4D960LNANNNNN	PowerFlex 755	960 A class	Air cooled	AC Packaged Drive	Configuration dependent	Configuration dependent
20G1F4D1K0LNDNNNNN	PowerFlex 755	1,000 A class	Air cooled	AC Packaged Drive	Configuration dependent	Configuration dependent
20G1F4D1K3LNDNNNNN	PowerFlex 755	1,300 A class	Air cooled	AC Packaged Drive	Configuration dependent	Configuration dependent

These models are all closely associated with the high-power PowerFlex 755 family.

The 740 A and 800 A configurations provide lower current capacity, while the 1,000 A and 1,300 A class models provide progressively higher current capacity.

The 20G1F4D960LNDNNNNN therefore sits in a useful high-current range for applications requiring a substantial motor drive without immediately moving to the very largest configurations.

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Five Same-Brand High-Power Models

Model	Product Family	Approx. Current Class	Product Type	Cooling	Typical Application	Approx. Dimensions	Approx. Weight
20G1F4C750LNDNNNNN	PowerFlex 755	750 A	AC Packaged Drive	Air cooled	Conveyors, pumps, fans	Configuration dependent	Configuration dependent
20G1F4D740LNDNNNNN	PowerFlex 755	740 A	AC Packaged Drive	Air cooled	Heavy industrial machinery	Configuration dependent	Configuration dependent
20G1F4D800LNDNNNNN	PowerFlex 755	800 A	AC Packaged Drive	Air cooled	Large process machinery	Configuration dependent	Configuration dependent
20G1F4D1K0LNDNNNNN	PowerFlex 755	1,000 A class	AC Packaged Drive	Air cooled	Mining and heavy material handling	Configuration dependent	Configuration dependent
20G1F4D1K3LNDNNNNN	PowerFlex 755	1,300 A class	AC Packaged Drive	Air cooled	Very high-power industrial systems	Configuration dependent	Configuration dependent

These models are useful comparison points when evaluating high-power drive requirements.

The 750 A, 740 A, and 800 A class configurations are relatively close to the target model and may be considered where the motor current requirement falls within the appropriate rating range.

The 1,000 A and 1,300 A class configurations are intended for larger motor and load requirements.

For replacement applications, the complete catalog number should always be compared because similar current ratings do not necessarily mean that two drives have identical electrical or mechanical configurations.

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High-Power Model Comparison

Feature	20G1F4D740LNDNNNNN	20G1F4D800LNDNNNNN	20G1F4D960LNDNNNNN	20G1F4D1K0LNDNNNNN	20G1F4D1K3LNDNNNNN
Series	PowerFlex 755	PowerFlex 755	PowerFlex 755	PowerFlex 755	PowerFlex 755
Current Class	740 A	800 A	960 A	1,000 A	1,300 A
Product Type	Packaged AC Drive	Packaged AC Drive	Packaged AC Drive	Packaged AC Drive	Packaged AC Drive
Cooling	Air cooled	Air cooled	Air cooled	Air cooled	Air cooled
Installation	Floor mounted	Floor mounted	Floor mounted	Floor mounted	Floor mounted
Typical Load	Large industrial	Large industrial	Very large industrial	Very large industrial	Extra-high-power
Conveyor Application	Yes	Yes	Yes	Yes	Yes
Pump Application	Yes	Yes	Yes	Yes	Yes
Fan Application	Yes	Yes	Yes	Yes	Yes
Mining Application	Yes	Yes	Yes	Yes	Yes
Process Machinery	Yes	Yes	Yes	Yes	Yes
Dimensions	Configuration dependent	Configuration dependent	Approx. 2477 × 800 × 800 mm	Configuration dependent	Configuration dependent
Weight	Configuration dependent	Configuration dependent	Approx. 995 kg	Configuration dependent	Configuration dependent

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Application Selection Guide

Conveyor Systems

For a large conveyor, verify the motor full-load current, starting torque, belt inertia, gearbox ratio, acceleration time, operating speed, and expected load variation.

The drive should be selected based on actual motor current and duty requirements rather than horsepower alone.

For very long conveyors, the mechanical system can have substantial inertia, making acceleration and deceleration settings particularly important.

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Pump Systems

For large pumps, review the required flow, pressure, motor current, speed range, and minimum operating speed.

If variable-speed operation is being used for process control, the pump and motor must be suitable for the intended speed range.

The drive’s current rating should be matched to the motor nameplate current and required overload capability.

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Fan and Blower Systems

Large fans can have considerable rotating inertia.

The drive should therefore be evaluated not only according to motor running current but also according to the time required to accelerate the fan to operating speed.

The airflow requirement and operating-speed range should also be considered.

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Compressor Systems

For compressors, the mechanical manufacturer’s approved operating range should be followed.

The motor’s acceleration characteristics and thermal limits should be considered.

The drive should be selected together with the compressor system rather than independently.

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Hoists and Cranes

Hoists and cranes can involve regenerative energy when lowering or decelerating heavy loads.

The braking system should therefore be evaluated carefully.

The required feedback system, brake control, emergency-stop arrangement, and stopping behavior should be considered as part of the overall machine design.

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Maintenance Considerations

Maintenance of a large air-cooled drive should include regular inspection of the cooling system.

Cooling fans should be checked for abnormal noise, vibration, restricted airflow, and signs of wear.

The cabinet should be inspected for excessive dust accumulation.

Air passages should remain clean and unobstructed.

Electrical connections should be inspected according to the maintenance schedule established for the installation.

The surrounding electrical room should also be kept within the recommended environmental conditions.

If the drive operates continuously at a high load level, thermal conditions should receive particular attention.

High operating temperature can reduce the service life of electronic components, fans, capacitors, and other internal equipment.

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Replacement Considerations

When replacing an existing drive with the 20G1F4D960LNDNNNNN, matching the current rating alone is not enough.

The following items should be checked:

Selection Item	What Should Be Checked
Motor Voltage	Confirm the motor voltage matches the drive configuration
Motor Current	Compare the actual nameplate current with the applicable drive rating
Duty	Confirm normal-duty and heavy-duty requirements
Input Power	Confirm the plant supply voltage and phase arrangement
Cooling	Confirm the available ventilation and airflow
Cabinet	Check physical dimensions and enclosure arrangement
Braking	Determine whether braking equipment is required
Regeneration	Check whether the load returns energy to the drive
Feedback	Confirm encoder or other feedback requirements
Communication	Confirm required industrial network interfaces
Environment	Check temperature, humidity, dust, altitude, and vibration
Cable Entry	Confirm power and control cable routing
Maintenance Space	Confirm access for inspection and service
Weight	Verify transportation and floor-loading requirements

A replacement drive with a similar current rating can still require changes to the installation if the cabinet dimensions, cable connections, cooling system, or options are different.

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Product Advantages Summary

Advantage	Description
Very High Current Capacity	Suitable for large industrial motors
480 V Class	Suitable for high-power three-phase industrial systems
Air-Cooled Design	Practical forced-air thermal management
Packaged Construction	Suitable for dedicated drive-room installations
Variable-Speed Control	Allows motor speed to follow process requirements
Controlled Starting	Helps manage high motor starting demand
Controlled Stopping	Provides controlled deceleration
High-Inertia Capability	Suitable for demanding rotating machinery
Automation Integration	Designed for use within industrial control systems
Heavy Industrial Applications	Suitable for mining, cement, steel, pumps, fans, and conveyors
Floor-Mounted Design	Appropriate for large electrical installations
High-Power Platform	Suitable for applications beyond compact VFD systems

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Final Technical Specification

Parameter	Final Specification
Model	20G1F4D960LNDNNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product Type	High-Power Air-Cooled AC Packaged Drive
Input Voltage	480 V AC class
Input Phase	3 Phase
Current Class	Approximately 960 A
Cooling	Forced-Air / Air Cooled
Installation	Floor Mounted
Package	Industrial Packaged Cabinet
Motor Application	Large Industrial AC Motors
Typical Duty	Heavy-Duty Industrial
Typical Applications	Conveyors, mining, pumps, fans, compressors, material handling, process machinery
Approx. Dimensions	2477 × 800 × 800 mm (H × W × D)
Approx. Weight	995 kg
Feedback	Configuration Dependent
Communication	Configuration Dependent
Braking	Configuration Dependent
Regenerative Operation	Configuration Dependent
Environment	Industrial Electrical Room / Drive Room

Conclusion

The 20G1F4D960LNDNNNNN is a high-power PowerFlex 755 air-cooled AC packaged drive designed for large industrial motor-control applications.

With an approximately 960 A current class, it is intended for substantial motor systems where conventional compact variable-frequency drives do not provide sufficient capacity.

Its air-cooled packaged construction makes it suitable for dedicated electrical rooms and large industrial installations.

Typical applications include mining conveyors, cement and aggregate machinery, steel-processing equipment, large pumps, industrial fans, compressors, material-handling systems, and other heavy process machinery.

The major practical advantages are high current capacity, variable-speed motor operation, controlled acceleration and deceleration, air-cooled thermal management, packaged cabinet construction, and compatibility with larger industrial automation systems.

The model is part of a broad high-power PowerFlex 755 family. Related models such as the 20G1F4D740LNDNNNNN, 20G1F4D800LNDNNNNN, 20G1F4D1K0LNDNNNNN, and 20G1F4D1K3LNDNNNNN provide different current-capacity ranges for different motor and load requirements. These related catalog numbers are listed within the same product family.

For preliminary engineering planning, the approximate physical size of 2477 × 800 × 800 mm and approximate weight of 995 kg can be used as reference values.

For final purchasing, transportation, installation, foundation design, lifting, and maintenance planning, the exact mechanical drawing and configuration data for the supplied unit should take precedence.