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Allen-Bradley 20G1F3E825LNDNNNNN

High-Power PowerFlex 755 AC Packaged Drive

The 20G1F3E825LNDNNNNN is a high-capacity AC variable frequency drive designed for large industrial motor applications. It belongs to the PowerFlex 755 series and uses an air-cooled packaged configuration intended for high-power three-phase AC motor control.

This model is particularly suited to large pumps, fans, conveyors, compressors, material-handling systems, process machinery and other industrial equipment requiring substantial motor power and adjustable-speed operation.

The 825 A designation places this model in the very-high-current range of the PowerFlex 755 family. It is intended for applications where a conventional small or medium-size variable frequency drive would not provide sufficient output current or power capacity.

The large-frame construction also makes this product fundamentally different from compact drive products. It is normally installed as part of a dedicated industrial electrical system, drive cabinet, motor-control center or electrical room installation.

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1. Basic Product Information

Item	Specification
Model	20G1F3E825LNDNNNNN
Brand	Allen-Bradley
Product series	PowerFlex 755
Product type	AC variable frequency drive
Configuration	Air-cooled packaged drive
Application	Large industrial AC motor control
Input system	Three-phase AC
Voltage class	600 VAC class
Current designation	825 A
Drive category	High-power industrial drive
Cooling method	Forced-air cooling
Installation style	Floor-mounted / cabinet-mounted industrial configuration
Frame class	Large Frame 9 class configuration
Operator interface	Door-mounted operator interface configuration
Motor control	Adjustable-speed AC motor control
Primary function	Motor speed and torque regulation
Typical application level	Heavy industrial machinery
Installation environment	Industrial electrical room / drive room / MCC-type installation

The 20G1F3E825LNDNNNNN is therefore not simply a general-purpose motor controller. It is a large industrial drive intended to form part of a complete motor-control system.

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2. Product Series

PowerFlex 755 Series

The 20G1F3E825LNDNNNNN belongs to the PowerFlex 755 series.

The PowerFlex 755 family covers a broad range of AC drive configurations, from relatively smaller industrial motor applications through very large high-power motor installations.

The series is designed around applications where precise control of motor speed and torque is important. Depending on the application and configuration, the drive platform can be used for pumps, fans, conveyors, compressors, mixers, extruders, process machinery and other industrial equipment.

The 825 A version represents one of the high-current configurations of the series.

The series approach also makes it possible for an engineering department to use a common drive platform across different motor sizes. Smaller applications can use lower-current versions, while larger machines can use high-current versions such as the 20G1F3E825LNDNNNNN.

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3. Detailed Technical Parameters

Parameter	20G1F3E825LNDNNNNN
Model	20G1F3E825LNDNNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product type	Air-cooled 755 AC packaged drive
Input voltage class	600 VAC class
Input phase	3-phase
Rated current designation	825 A
Normal-duty power class	Approximately 800–900 HP range, depending on duty and motor conditions
Light-duty current	Approximately 825 A
Heavy-duty current	Application dependent and lower than the light-duty rating
Frequency	50/60 Hz supply applications
Cooling	Forced-air
Drive construction	Large-frame packaged construction
Frame	Frame 9 / large-frame class
Mounting	Floor-mounted
Enclosure style	Industrial cabinet / Type 1-style configuration
Operator interface	Door-mounted HIM-type interface
Motor application	Large three-phase AC motors
Control purpose	Variable-speed and torque control
Typical motor range	Hundreds of horsepower
Cabinet height	Approximately 2453 mm
Cabinet width	Approximately 1200 mm
Cabinet depth	Approximately 600–800 mm
Approximate weight	Approximately 1246 kg
Approximate weight in lb	Approximately 2748 lb
Installation type	Dedicated industrial electrical installation
Cooling-air requirement	High
Maintenance access	Front service access with appropriate clearances
Application class	Large industrial machinery

The 825 A designation should not be interpreted as meaning that every connected motor must operate continuously at exactly 825 A. Actual motor selection depends on voltage, motor full-load current, duty cycle, overload requirements, ambient conditions, acceleration requirements and the specific drive configuration.

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4. Electrical Characteristics

The 20G1F3E825LNDNNNNN is associated with the 600 VAC class and a three-phase industrial power system.

The high-current design allows the drive to control large motors that would be outside the range of ordinary compact VFDs.

The 825 A figure is particularly important when matching the drive to the motor. Motor selection should be based on the actual motor nameplate current and application duty rather than horsepower alone.

For example, two motors with similar horsepower ratings may have different current requirements depending on motor efficiency, voltage, power factor and operating conditions.

For this reason, the correct engineering procedure is to compare:

• Motor rated voltage
• Motor full-load current
• Required overload
• Required starting torque
• Continuous load
• Peak load
• Acceleration time
• Deceleration time
• Duty cycle
• Ambient temperature
• Installation altitude
• Cooling conditions

with the corresponding drive capabilities.

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5. Power Rating

The 20G1F3E825LNDNNNNN is positioned in the very-high-power segment of the PowerFlex 755 family.

The 825 A current designation makes it appropriate for large motors and large mechanical systems.

For practical selection, the power rating should always be treated together with the duty rating.

A motor used for a relatively steady pump or fan load may have different requirements from a crusher, conveyor or mixer that experiences frequent acceleration and high torque.

Therefore, an 825 A drive should not automatically be matched to any motor simply because the motor horsepower appears to be within a similar numerical range.

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6. Physical Dimensions and Weight

The physical size of this model is one of its most important characteristics.

Large PowerFlex 755 Frame 9-class packaged drives require considerably more installation space than compact wall-mounted drives.

Physical Parameter	Approximate Value
Model	20G1F3E825LNDNNNNN
Frame	Frame 9 class
Height	Approx. 2453 mm
Width	Approx. 1200 mm
Depth	Approx. 600–800 mm
Approximate weight	Approx. 1246 kg
Approximate weight	Approx. 2748 lb
Mounting	Floor-mounted
Cooling	Forced-air
Cabinet construction	Large industrial cabinet
Service access	Front access required
Installation space	Larger than compact VFDs

The 2453 mm height means that the equipment is approximately 2.45 m tall.

The approximately 1200 mm cabinet width provides the necessary space for the large power components, cooling equipment and associated control hardware.

The approximate 1246 kg weight also means that transportation and installation must be planned in advance.

A suitable floor structure, lifting method and access route should be confirmed before the equipment is delivered.

The final physical dimensions and weight can vary according to the exact factory configuration, options and associated cabinets. For this reason, the complete catalog number should be used when preparing final mechanical drawings.

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7. Product Introduction

The 20G1F3E825LNDNNNNN is designed to convert fixed-frequency AC electrical power into controlled variable-frequency power for a large AC motor.

The fundamental purpose is to allow the motor to operate at a controlled speed instead of simply running at a fixed speed determined by the incoming electrical supply.

This gives the machine operator or automation system much greater control over the production process.

For example, a pump may need to operate at different flow rates during the day.

A fan may need to provide different airflow levels depending on production requirements.

A conveyor may need slow acceleration when heavily loaded and faster operation once it reaches normal speed.

A compressor may need to adjust motor speed according to process demand.

In each of these situations, a high-power variable frequency drive provides the electrical control between the power supply and the motor.

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8. How the Drive Works

A variable frequency drive generally performs three main electrical functions.

First, incoming AC power is converted into a DC link.

Second, the DC link is electronically controlled.

Third, an inverter section produces controlled AC output for the motor.

By controlling the output frequency and voltage, the drive can regulate motor operating speed.

The drive can also control acceleration and deceleration.

This is particularly valuable for large industrial machines because a large motor and mechanical load can have significant inertia.

Starting such a machine directly across the line can result in a sudden electrical and mechanical event.

Using controlled acceleration allows the motor to build speed progressively.

The same principle applies during stopping.

Instead of abruptly removing power from the motor, the drive can use a programmed deceleration profile appropriate for the machine.

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9. Main Product Advantages

9.1 High Current Capability

The primary advantage of the 20G1F3E825LNDNNNNN is its high-current capability.

An 825 A configuration is designed for large industrial motors and high-power mechanical systems.

This allows the drive to be used in applications where a smaller VFD would be insufficient.

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9.2 Adjustable Motor Speed

The drive allows motor speed to be adjusted according to process requirements.

This can be useful when equipment does not need to operate continuously at maximum speed.

For pumps, fans and similar variable-torque loads, speed adjustment can also provide a more flexible method of controlling process output.

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9.3 Controlled Starting

Large motors can require substantial starting current and can generate significant mechanical stress.

A variable frequency drive can provide a controlled acceleration ramp.

This allows the motor and driven equipment to accelerate progressively.

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9.4 Controlled Stopping

The drive can also provide controlled deceleration.

This is useful for equipment where abrupt stopping could cause mechanical stress, product movement or process instability.

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9.5 Reduced Mechanical Shock

Controlled acceleration and deceleration can reduce sudden loading on:

• Gearboxes
• Couplings
• Shafts
• Belts
• Conveyor systems
• Pumps
• Fans
• Compressors
• Other rotating machinery

This can be particularly important in large mechanical systems.

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9.6 Process Control

A variable-speed motor can respond to changing production requirements.

Instead of controlling a process entirely through mechanical valves, dampers or other restrictive devices, the motor itself can sometimes be operated at a speed closer to the actual process requirement.

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9.7 Large Industrial Architecture

The large-frame design provides a platform suitable for high-power industrial installations.

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

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10. Typical Applications

10.1 Large Water Pumps

The drive can be applied to large pump systems where motor speed needs to vary according to flow or pressure requirements.

Typical applications include:

• Water treatment
• Industrial water circulation
• Cooling-water systems
• Process water
• Irrigation
• Mining water systems
• Industrial utility systems
• Large pumping stations

The ability to adjust motor speed can make the pumping system more flexible.

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11. Large Fans and Blowers

Industrial fans and blowers often require very large motors.

The drive can provide variable-speed control for applications such as:

• Factory ventilation
• Exhaust systems
• Dust collection
• Furnace ventilation
• Process air
• Mining ventilation
• Cement production
• Steel production
• Chemical processing

Instead of operating the fan at one fixed speed, the system can adjust the motor speed according to the required airflow.

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12. Conveyor Systems

Large conveyors can have significant inertia and may transport heavy materials.

Applications can include:

• Mining conveyors
• Bulk material handling
• Aggregate plants
• Cement facilities
• Ports
• Steel plants
• Manufacturing facilities
• Large warehouse systems

Controlled acceleration is especially useful for long conveyor systems.

A gradual acceleration profile can help reduce sudden stress on belts, gearboxes and drive components.

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13. Compressors

Large industrial compressors can require substantial motor power.

The drive can be used in suitable compressor systems where variable-speed operation is required.

Potential applications include:

• Industrial compressed-air systems
• Process gas systems
• Manufacturing
• Chemical processing
• Utility systems
• Large process equipment

The actual suitability depends on compressor design and the required torque-speed characteristics.

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14. Crushers and Heavy Process Equipment

High-power drives are also useful in applications involving heavy mechanical loads.

Examples include:

• Crushers
• Mills
• Mixers
• Material-processing equipment
• Heavy conveyors
• Industrial shredding systems
• Large production machinery

These applications require careful attention to overload and starting-torque requirements.

The correct drive should therefore be selected based on actual machine characteristics rather than nominal horsepower alone.

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15. Pumps, Fans and Variable-Torque Loads

One of the important application areas for a variable frequency drive is variable-torque equipment.

Pumps and fans frequently operate under changing process conditions.

If the process requires less flow or airflow, operating the motor at a lower speed can provide a direct means of adjusting the equipment output.

This can also reduce unnecessary operation at maximum speed.

The actual energy performance depends on the motor, pump or fan design, system resistance, operating point and control strategy.

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16. Five Related Models from the PowerFlex 755 Series

The following models are closely related configurations within the same PowerFlex 755 family and can be considered when comparing current ratings and application requirements.

Model	Series	Voltage Class	Approx. Current	General Capacity	Cooling	Approx. Dimensions	Approx. Weight
20G1F3E545LNDNNNNN	PowerFlex 755	600 V class	545 A	High-power	Air-cooled	Large-frame configuration	Configuration dependent
20G1F3E595LNDNNNNN	PowerFlex 755	600 V class	595 A	High-power	Air-cooled	Large-frame configuration	Configuration dependent
20G1F3E690LNDNNNNN	PowerFlex 755	600 V class	690 A	Very high-power	Air-cooled	Large-frame configuration	Configuration dependent
20G1F3E760LNDNNNNN	PowerFlex 755	600 V class	760 A	Very high-power	Air-cooled	Approx. 2453 × 1200 × 600–800 mm	Approx. 1246 kg
20G1F3E980LNDNNNNN	PowerFlex 755	600 V class	980 A class	Extremely high-power	Air-cooled	Large-frame configuration	Configuration dependent

The five models above are useful for comparing different current requirements within the same general 600 V-class PowerFlex 755 configuration.

20G1F3E545LNDNNNNN

The 545 A version is suitable for applications requiring less current than the 825 A configuration.

It can be considered when the motor’s full-load current and overload requirements fall comfortably below the larger drive rating.

20G1F3E595LNDNNNNN

The 595 A version provides another intermediate current option.

It may be useful for large industrial motors where the 545 A rating is insufficient but the larger 690 A, 760 A or 825 A configurations are unnecessary.

20G1F3E690LNDNNNNN

The 690 A configuration provides substantially more capacity than the 595 A version.

It can be used for large industrial motors and demanding applications where current requirements are higher.

20G1F3E760LNDNNNNN

The 760 A version is particularly close to the 825 A model in terms of overall application class.

It is therefore a useful comparison model when evaluating a system where the required motor current is close to the boundary between the two configurations.

20G1F3E980LNDNNNNN

The 980 A configuration provides a higher current class and is intended for applications requiring still greater motor current capacity.

It is appropriate to consider when the motor and application requirements exceed the capability of lower-current configurations.

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17. Five Popular Models Under the Same Brand

The following models represent other commonly encountered industrial drive products under the same brand. They cover different application sizes and drive classes and are not necessarily direct replacements for the 20G1F3E825LNDNNNNN.

Model	Product Family	Typical Voltage Class	Approx. Current / Capacity	Typical Application	Approx. Dimensions	Approx. Weight
20G1F3E825LNDNNNNN	PowerFlex 755	600 V class	825 A	Large pumps, fans, conveyors, compressors	Approx. 2453 × 1200 × 600–800 mm	Approx. 1246 kg
20G1F3E760LNDNNNNN	PowerFlex 755	600 V class	760 A	Large industrial motors	Approx. 2453 × 1200 × 600–800 mm	Approx. 1246 kg
20G1F3E690LNDNNNNN	PowerFlex 755	600 V class	690 A	Heavy industrial equipment	Large-frame	Configuration dependent
20G1F3D710LNDNNNNN	PowerFlex 755	600 V class	710 A class	High-power machinery	Large-frame	Configuration dependent
20G1F3C650LNDNNNNN	PowerFlex 755	480 V class	650 A class	Large industrial motors	Large-frame	Configuration dependent

These models illustrate the breadth of the high-power drive range.

When selecting between them, the voltage class must be checked first, followed by motor current, duty requirements, overload capability and physical installation requirements.

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18. Comparison of Related 600 V-Class Models

Parameter	20G1F3E545LNDNNNNN	20G1F3E595LNDNNNNN	20G1F3E690LNDNNNNN	20G1F3E760LNDNNNNN	20G1F3E825LNDNNNNN
Series	PowerFlex 755	PowerFlex 755	PowerFlex 755	PowerFlex 755	PowerFlex 755
Voltage class	600 V	600 V	600 V	600 V	600 V
Current class	545 A	595 A	690 A	760 A	825 A
Cooling	Air-cooled	Air-cooled	Air-cooled	Air-cooled	Air-cooled
Product class	High-power	High-power	Very high-power	Very high-power	Very high-power
Frame class	Large	Large	Large	Frame 9	Frame 9
Approx. height	Configuration dependent	Configuration dependent	Configuration dependent	2453 mm	2453 mm
Approx. width	Configuration dependent	Configuration dependent	Configuration dependent	1200 mm	1200 mm
Approx. depth	Configuration dependent	Configuration dependent	Configuration dependent	600–800 mm	600–800 mm
Approx. weight	Configuration dependent	Configuration dependent	Configuration dependent	1246 kg	1246 kg
Typical application	Large motor	Large motor	Very large motor	Very large motor	Very large motor

The comparison demonstrates that the 20G1F3E825LNDNNNNN sits toward the upper end of this group in terms of current capacity.

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19. Advantages Compared with a Smaller Drive

The principal difference between this model and a smaller VFD is current capacity.

A smaller drive may be perfectly suitable for a 20 HP, 50 HP or 100 HP motor, but it cannot simply be scaled upward indefinitely.

A motor requiring hundreds of amps needs a completely different power section, cooling system, cabinet structure and installation arrangement.

The 825 A configuration is designed for this class of application.

The large cabinet provides sufficient physical space for high-current components and forced-air cooling equipment.

The result is a drive intended for large industrial machines rather than general-purpose small machinery.

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20. Installation Requirements

The 20G1F3E825LNDNNNNN should be installed by personnel familiar with high-voltage and high-current industrial equipment.

Important considerations include:

Electrical supply

The incoming power system must be suitable for the drive’s voltage and current requirements.

Motor cable

Motor cable selection must account for current, insulation, installation method, electromagnetic compatibility and cable length.

Grounding

A suitable grounding system is essential for both personnel safety and reliable operation.

Cooling

The drive generates heat during operation.

Adequate ventilation and cooling-air movement must therefore be provided.

Cabinet clearance

The installation should provide enough space for ventilation and maintenance.

Floor loading

With an approximate equipment weight of 1246 kg, floor loading should be verified before installation.

Transportation

The physical size and weight require appropriate lifting and transportation equipment.

Maintenance access

Technicians need sufficient working space around the cabinet for inspection and service activities.

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21. Maintenance

A high-power drive requires a planned maintenance approach.

Routine maintenance can include inspection of:

• Cooling fans
• Air passages
• Electrical terminals
• Power connections
• Ground connections
• Control wiring
• Cabinet condition
• Operator interface
• Fault history
• Motor cables
• External disconnect equipment
• Ventilation system

Dust accumulation can restrict airflow and increase operating temperature.

Cooling fans are also important because failure of the cooling system can cause excessive internal temperature.

For a high-current drive, electrical connections should be checked according to the applicable maintenance procedure and equipment requirements.

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22. Application Selection Considerations

The 20G1F3E825LNDNNNNN should be selected based on the complete application rather than a single specification.

The following points should be reviewed before purchase.

Selection Factor	Why It Matters
Motor voltage	Must correspond to the drive output voltage range
Motor full-load current	Determines the required continuous current capability
Motor horsepower	Provides an initial sizing reference
Load type	Determines torque and overload requirements
Starting torque	Important for conveyors, crushers and heavy machinery
Overload	Determines whether the drive can handle temporary load increases
Acceleration	Important for high-inertia equipment
Deceleration	Important for controlled stopping
Duty cycle	Determines thermal and overload requirements
Ambient temperature	Influences drive derating
Altitude	Can affect cooling performance
Installation method	Determines cabinet and cooling requirements
Motor cable length	Can affect electrical performance
Communication requirements	Determines integration requirements
Physical dimensions	Important for cabinet and room layout
Weight	Important for transportation and floor loading

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23. Product Advantages at a Glance

Advantage	Description
High current	Suitable for very large AC motors
Large power range	Designed for hundreds of horsepower
Variable speed	Motor speed can be adjusted according to process demand
Controlled acceleration	Helps reduce mechanical shock
Controlled deceleration	Allows smoother stopping
Industrial construction	Suitable for demanding industrial environments
Forced-air cooling	Supports high-power operation
Large-frame architecture	Provides physical capacity for high-current equipment
Process integration	Suitable for larger automation systems
Wide application range	Pumps, fans, conveyors, compressors and process machinery
Scalable family	Related current ratings are available in the same series
Operator interface	Provides local access to operating information and drive functions

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24. Product Positioning

The 20G1F3E825LNDNNNNN should be regarded as a high-power industrial motor-control product rather than a standard compact frequency converter.

Its 825 A configuration, large-frame construction and air-cooled packaged design make it suitable for large industrial installations.

It is particularly relevant where the motor is too large for conventional compact drives and where adjustable-speed operation provides process or mechanical benefits.

The product is also suitable for centralized drive installations where several large motor-control systems are installed within an industrial electrical area.

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25. Important Difference Between Model Numbers

The PowerFlex 755 family contains many catalog numbers that look very similar.

For example:

20G1F3E545LNDNNNNN

20G1F3E595LNDNNNNN

20G1F3E690LNDNNNNN

20G1F3E760LNDNNNNN

20G1F3E825LNDNNNNN

20G1F3E980LNDNNNNN

Although these products belong to the same general series, the current rating is different.

This means that they should not be treated as interchangeable simply because the cabinet appearance or series name is similar.

The motor full-load current and required duty should always be checked before replacing one model with another.

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26. Recommended Related Models

For applications close to the 20G1F3E825LNDNNNNN, the following models are useful for comparison:

Priority for Comparison	Model	Current Class	Main Reason to Consider
1	20G1F3E760LNDNNNNN	760 A	Closely related lower-current configuration
2	20G1F3E690LNDNNNNN	690 A	Lower-current alternative
3	20G1F3E595LNDNNNNN	595 A	Intermediate lower-current option
4	20G1F3E545LNDNNNNN	545 A	Lower-capacity alternative
5	20G1F3E980LNDNNNNN	980 A class	Higher-capacity alternative

These models provide a useful range when comparing drive capacity around the 825 A configuration.

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27. Recommended Same-Brand Models

Model	Series	Voltage Class	Current / Capacity	Typical Use	Approx. Dimensions	Approx. Weight
20G1F3E825LNDNNNNN	PowerFlex 755	600 V	825 A	Large pumps, fans, conveyors	2453 × 1200 × 600–800 mm	1246 kg
20G1F3E760LNDNNNNN	PowerFlex 755	600 V	760 A	Large industrial motors	2453 × 1200 × 600–800 mm	1246 kg
20G1F3E690LNDNNNNN	PowerFlex 755	600 V	690 A	Heavy-duty machinery	Large-frame	Configuration dependent
20G1F3D710LNDNNNNN	PowerFlex 755	600 V	710 A class	High-power motor control	Large-frame	Configuration dependent
20G1F3C650LNDNNNNN	PowerFlex 755	480 V	650 A class	Large AC motor systems	Large-frame	Configuration dependent

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28. Final Technical Summary

Category	20G1F3E825LNDNNNNN
Model	20G1F3E825LNDNNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product category	AC variable frequency drive
Configuration	Air-cooled packaged drive
Voltage class	600 VAC
Phase	Three-phase
Current designation	825 A
Application class	High-power industrial
Frame	Frame 9 / large-frame class
Cooling	Forced air
Mounting	Floor-mounted
Operator interface	Door-mounted
Approx. height	2453 mm
Approx. width	1200 mm
Approx. depth	600–800 mm
Approx. weight	1246 kg
Main applications	Pumps, fans, conveyors, compressors, process machinery
Main function	Variable-speed motor control
Main advantage	High-current control for large industrial motors
Installation	Dedicated industrial electrical installation
Maintenance	Planned inspection and cooling-system maintenance required

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29. Conclusion

The 20G1F3E825LNDNNNNN is a large-frame, high-current AC drive belonging to the PowerFlex 755 series.

Its 825 A configuration makes it suitable for very large three-phase AC motors and heavy industrial machinery. The product is designed for applications where adjustable speed, controlled acceleration, controlled deceleration and process-oriented motor control are required.

The model is especially relevant to large pumps, fans, conveyors, compressors, material-handling systems and process machinery.

Its large physical construction is an important part of the product specification. The approximate 2453 mm height, 1200 mm width, 600–800 mm depth and approximately 1246 kg weight mean that installation, transportation, floor loading, ventilation and maintenance access need to be considered during system design.

Compared with smaller drives, the major advantage of this model is its ability to handle very high motor current while maintaining the control characteristics expected from a modern industrial variable frequency drive.

Within the same series, the 20G1F3E545LNDNNNNN, 20G1F3E595LNDNNNNN, 20G1F3E690LNDNNNNN, 20G1F3E760LNDNNNNN and 20G1F3E980LNDNNNNN provide useful comparison points around the high-current range.

For an actual replacement project, however, the complete catalog number should always be checked against the motor nameplate, supply voltage, full-load current, overload requirement, duty cycle, enclosure arrangement and installed options. Similar-looking catalog numbers can have different electrical capabilities or factory configurations.