Allen-Bradley 20G11BD1K5AN0NNNNN — PowerFlex 755 High-Power AC Drive

1. Product Overview

The 20G11BD1K5AN0NNNNN is a high-power PowerFlex 755 AC drive designed for large industrial motor-control applications.

It belongs to the PowerFlex 750-Series and specifically to the PowerFlex 755 family. This configuration is intended for large three-phase AC motors where high current capacity, variable-speed control, controlled acceleration, process flexibility and industrial automation integration are required.

The model is designed for a 480 VAC, three-phase electrical system and has a rated output current of approximately 1,525 A.

Its power ratings are approximately:

• 1,500 HP Light Duty
• 1,350 HP Normal Duty
• 1,100 HP Heavy Duty

This places the 20G11BD1K5AN0NNNNN in the very-high-power range of the PowerFlex 755 family.

It is substantially larger than compact industrial VFDs and is intended for major equipment such as large pumps, fans, blowers, conveyors, mining equipment, cement machinery, metals-processing equipment, large material-handling systems and other heavy industrial machinery.

The unit uses an air-cooled design, Frame 10 construction and a 600 mm deep MCC-style package.

The configuration includes AC input with DC terminals, an EMC filter, a removed common-mode capacitor jumper configuration, no dynamic braking and no local HIM/operator module in the basic configuration.

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2. Brand and Product Series

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3. Main Technical Parameters

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4. Product Classification

The 20G11BD1K5AN0NNNNN is not a small or medium-sized general-purpose inverter.

It is a very-high-power industrial variable-frequency drive.

The approximately 1,525 A current rating is the most important indicator of the scale of this equipment.

A drive at this current level is normally associated with large motors and substantial industrial loads.

The unit is intended for projects where the motor itself can be several hundred kilowatts or more, and where the electrical system, mechanical system and automation system all need to be engineered together.

For comparison, a compact VFD may control a small motor using only a few amperes.

This model operates at more than one thousand amperes.

That difference affects everything from power distribution and cable selection to cabinet design, cooling, installation, maintenance and transportation.

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5. 480 VAC Three-Phase Input

The 20G11BD1K5AN0NNNNN is designed around a 480 VAC three-phase industrial power system.

This voltage class is widely used in large industrial facilities.

The three-phase input is converted and controlled by the drive so that the connected AC motor can operate at a controlled speed and torque.

Because of the extremely high current level, the incoming electrical system must be designed specifically for the application.

The installation normally requires careful consideration of:

• Main disconnect equipment
• Input protection
• Semiconductor protection
• Cable sizing
• Busbar sizing
• Grounding
• Short-circuit considerations
• Harmonic performance
• EMC requirements
• Ventilation
• Maintenance access

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6. 1,525 A Current Rating

The approximately 1,525 A rating is the defining characteristic of this model.

This current capability allows the drive to control very large motors.

At this power level, the drive is appropriate for machinery where a smaller VFD would not provide sufficient current capacity.

The high current rating is particularly valuable for large machines with substantial mechanical loads.

Typical examples include:

• Large mining conveyors
• Large process pumps
• Industrial fans
• High-capacity blowers
• Heavy material-handling equipment
• Large water pumps
• Cement-process equipment
• Metals-processing machinery

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7. Horsepower Ratings

The model provides different motor ratings depending on the operating duty.

These ratings should be interpreted according to the actual duty cycle.

The Heavy Duty rating is lower than the Light Duty rating because demanding loads require greater current and thermal margin.

Therefore, selecting the drive should not be based only on the motor horsepower shown on the motor nameplate.

The motor’s full-load current and actual mechanical load profile should also be evaluated.

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8. Light-Duty Applications

The 1,500 HP Light Duty rating is appropriate for applications where the motor operates with relatively moderate overload requirements.

Large centrifugal fans and certain pump systems can fall into this type of application.

Typical characteristics include:

• Long periods of relatively stable operation
• Moderate acceleration requirements
• Limited overload conditions
• Relatively predictable load torque

The higher Light Duty horsepower rating allows the same physical drive platform to control a very large motor when the application does not require the same overload capability as a Heavy Duty machine.

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9. Normal-Duty Applications

The approximately 1,350 HP Normal Duty rating is useful for many general industrial processes.

Normal Duty applications can include large:

• Pumps
• Fans
• Blowers
• Conveyors
• Material-handling systems
• Process machinery

The motor and drive should be matched according to actual current and duty requirements rather than horsepower alone.

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10. Heavy-Duty Applications

The approximately 1,100 HP Heavy Duty rating is especially important when the machine experiences high mechanical loading or substantial acceleration requirements.

Examples include:

• Heavy conveyors
• Large material-handling machines
• High-inertia loads
• Certain mining machinery
• Heavy process equipment
• Machinery with frequent starts and stops

Heavy-duty applications require careful attention to acceleration time, overload duration, motor thermal characteristics and mechanical inertia.

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11. Approximate Power Conversion

The horsepower values can be converted to approximate kilowatt values using 1 HP ≈ 0.746 kW.

These figures are useful for general engineering comparison.

They should not be treated as the exact electrical input power of the drive, because actual electrical input depends on motor efficiency, drive losses, operating point, power factor and other system characteristics.

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12. Product Introduction

The PowerFlex 755 platform is designed for applications where conventional fixed-speed motor operation is not sufficient.

In a traditional fixed-speed motor system, the motor generally runs at one operating speed whenever it is energized.

A variable-frequency drive provides another approach.

The drive controls the electrical frequency and voltage supplied to the motor, allowing the motor speed to change according to the process requirement.

For large industrial equipment, this can make a major difference.

A pump may not need full flow all the time.

A fan may not need maximum airflow.

A conveyor may need a controlled acceleration profile.

A blower may need to respond to changing process pressure.

A large production machine may need precise speed and torque control.

The PowerFlex 755 architecture is designed for these types of requirements.

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13. Basic Operating Principle

A simplified system can be represented as:

480 VAC Three-Phase Supply

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20G11BD1K5AN0NNNNN

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Controlled AC Output

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Large Industrial Motor

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Mechanical Equipment

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Industrial Process

The drive receives AC electrical power and controls the electrical output supplied to the motor.

The motor converts the electrical energy into mechanical power.

The drive continuously manages motor operation according to the programmed commands and feedback available from the application.

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14. Variable-Speed Motor Control

Variable-speed operation is one of the main reasons to use a high-power VFD.

Instead of running the motor continuously at maximum speed, the motor can be operated at a speed appropriate for the process.

This can improve:

• Process control
• Production flexibility
• Equipment response
• Starting performance
• Stopping performance
• Energy management
• Mechanical system behavior

For large industrial systems, even a relatively small change in operating speed can have a substantial effect on process performance.

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15. Controlled Acceleration

Starting a large motor directly can produce a significant electrical and mechanical impact.

The PowerFlex 755 can provide a controlled acceleration profile.

The motor can gradually increase speed instead of receiving an abrupt mechanical demand.

This is particularly useful for high-inertia equipment.

Potential benefits include:

• Reduced belt stress
• Reduced coupling stress
• Reduced gearbox shock
• Lower mechanical impact
• Smoother production startup
• Improved process control

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16. Controlled Deceleration

Stopping a large motor can be just as important as starting it.

A large rotating machine stores considerable kinetic energy.

Controlled deceleration can provide a smoother transition from operating speed to stopped condition.

This is useful for:

• Large conveyors
• Fans
• Blowers
• Pumps
• Material-handling systems
• High-inertia machinery

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17. Motor Control and Torque Management

Large industrial equipment frequently encounters changing loads.

A conveyor may become heavily loaded.

A pump may experience changing pressure.

A crusher may encounter different material conditions.

A large fan may experience changing system resistance.

The PowerFlex 755 platform is designed for advanced industrial motor-control applications where speed and torque behavior need to be controlled.

This makes the product more suitable for demanding applications than a basic VFD designed only for simple speed control.

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18. Embedded Industrial Communication

The PowerFlex 755 family is designed to integrate into industrial automation environments.

A drive can become part of a larger control system rather than operating as an isolated device.

Typical control information can include:

• Start
• Stop
• Speed reference
• Actual speed
• Current
• Drive status
• Alarm status
• Fault information
• Operating condition
• Diagnostic information

This allows operators and control systems to monitor the motor drive as part of the overall industrial process.

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19. Main Product Applications

Mining

Mining operations are one of the most demanding environments for large motor drives.

Large conveyors, pumps, ventilation systems and processing machinery can require very high motor power.

The 20G11BD1K5AN0NNNNN can be considered for:

• Long conveyors
• Ore conveyors
• Material-transfer systems
• Large ventilation fans
• Dewatering pumps
• Processing equipment
• Material-handling systems

Controlled acceleration is especially valuable on long conveyors because starting the entire mechanical system suddenly can place considerable stress on belts, couplings and gearboxes.

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20. Cement Industry

Cement plants contain numerous high-power motor applications.

Possible applications include:

• Large fans
• Crushers
• Conveyors
• Blowers
• Pumps
• Material-handling systems
• Process machinery
• Dust-control equipment

The ability to adjust motor speed can help match equipment operation to production requirements.

Large fans are particularly suitable for variable-speed control because airflow requirements can change according to the production process.

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21. Steel and Metals Processing

Large steel and metals facilities frequently use high-power motors.

The drive can be considered for:

• Large pumps
• Cooling systems
• Process fans
• Conveyors
• Material-handling equipment
• Production machinery
• Auxiliary process systems

Continuous industrial operation places considerable importance on thermal management, fault diagnostics and maintenance planning.

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22. Water and Wastewater

Large water systems can require pumps with hundreds or thousands of horsepower.

Variable-speed operation can help control flow and pressure.

Potential applications include:

• Raw-water pumping
• Industrial water circulation
• Cooling-water systems
• Wastewater pumping
• Large transfer pumps
• Water-treatment processes

The ability to adjust motor speed can reduce the need to operate pumps continuously at maximum output when the process demand is lower.

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23. Oil, Gas and Process Industry

Large industrial process facilities can contain high-power pumps, fans, compressors and material-handling equipment.

The PowerFlex 755 platform can be used where the motor-control requirements match the drive’s electrical and environmental specifications.

Typical considerations include:

• Process stability
• Speed control
• Torque control
• Motor protection
• Automation integration
• Maintenance diagnostics
• Equipment availability

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24. Large Fan Applications

Large industrial fans can be excellent candidates for variable-speed control.

A fan does not necessarily need to operate at full speed continuously.

When process airflow demand changes, motor speed can be adjusted accordingly.

Potential advantages include:

• Better airflow regulation
• Reduced throttling
• Potential energy savings
• Smooth starting
• Reduced mechanical stress
• Improved process stability

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25. Large Pump Applications

Pumping systems can also benefit significantly from variable-speed control.

Instead of maintaining maximum motor speed and regulating flow primarily through throttling, the motor speed can be adjusted to match the required operating condition.

Potential benefits include:

• Better flow control
• Better pressure regulation
• Reduced mechanical shock
• Potential energy savings
• Improved process flexibility
• Smoother pump startup

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26. Conveyor Applications

Conveyor systems can present a particularly demanding motor-control problem.

A large conveyor can contain:

• Long belts
• Multiple rollers
• Large gearboxes
• Heavy transported material
• High mechanical inertia

The drive can help control the acceleration and deceleration process.

This can reduce mechanical shock and provide more predictable system operation.

For large conveyor systems, the correct drive rating should be selected based on the conveyor’s actual torque requirements rather than horsepower alone.

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27. Main Product Advantages

27.1 Very High Current Capacity

The approximately 1,525 A current capability makes this model suitable for extremely large industrial motors.

It is intended for applications where smaller drive platforms would not have sufficient capacity.

27.2 Very High Horsepower Rating

The approximately 1,500 HP Light Duty rating puts the model near the upper end of large low-voltage industrial drive applications.

This allows one drive platform to serve extremely large motors.

27.3 Variable-Speed Control

Motor speed can be adjusted according to the process.

This provides greater flexibility than fixed-speed operation.

27.4 Controlled Acceleration

Large machines can be started more smoothly.

This can reduce mechanical shock.

27.5 Controlled Deceleration

Large rotating systems can be brought to a stop in a controlled manner.

27.6 Industrial Automation Integration

The drive can participate in an integrated automation system.

27.7 Advanced Motor Control

The PowerFlex 755 platform is designed for demanding industrial motor-control applications.

27.8 Air-Cooled Construction

The air-cooled design avoids the need for a dedicated liquid-cooling circuit.

The installation still requires adequate ventilation and heat removal.

27.9 Large-Scale Industrial Architecture

The MCC-style package is suited to large electrical installations and centralized industrial power-control systems.

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28. Energy-Saving Potential

Variable-speed drives can provide substantial energy-saving opportunities in suitable applications.

The most important examples are centrifugal pumps and fans.

When process demand decreases, the motor speed can also be reduced.

Instead of continuously operating at full speed, the motor can operate closer to the actual process requirement.

Potential benefits include:

• Lower energy consumption
• Reduced mechanical stress
• Better process control
• Reduced throttling
• Improved operating flexibility

However, energy savings depend on the actual equipment.

A VFD does not automatically guarantee a fixed energy-saving percentage.

The final result depends on the motor, pump or fan curve, process requirements, operating schedule and system design.

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29. Mechanical Advantages

Large industrial equipment can experience substantial mechanical stress during starting.

The drive can provide a controlled acceleration ramp.

This can help reduce stress on:

• Shafts
• Bearings
• Couplings
• Gearboxes
• Conveyor belts
• Pump assemblies
• Fan assemblies
• Mechanical structures

The actual mechanical benefit depends on the machine and the selected drive parameters.

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30. Electrical and Installation Considerations

A 1,525 A drive requires serious electrical engineering.

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31. Cooling Requirements

The 20G11BD1K5AN0NNNNN is an air-cooled drive.

At this power level, heat management is an important part of the installation.

The electrical room or enclosure must provide adequate airflow.

The cooling system should be inspected regularly.

Important maintenance areas include:

• Cooling fans
• Air filters where applicable
• Air intake
• Exhaust passages
• Cabinet ventilation
• Dust accumulation
• Ambient temperature
• Internal temperature

Restricted airflow can increase the internal temperature and reduce equipment reliability.

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32. Physical Dimensions

The standard configuration is associated with a 600 mm deep MCC-style construction.

The complete physical envelope can vary depending on the packaged configuration, cabinet arrangement and associated equipment.

Therefore, the following table should be used for preliminary equipment planning rather than as a certified dimensional drawing.

For an actual project, the final enclosure dimensions should be confirmed from the exact configured unit before the electrical room, MCC or foundation is finalized.

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33. Weight

Because this is a very-high-power Frame 10 packaged drive, it is considerably heavier than compact VFD products.

For preliminary planning, the unit can be considered to be in the 1,000 kg class.

The exact net weight can vary depending on the complete packaged configuration.

Shipping weight can also be higher because of packaging and transportation materials.

The approximate weight should not be used as the final value for structural calculations.

The actual configured equipment weight should be verified before lifting or transportation.

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34. Electrical Configuration

The 20G11BD1K5AN0NNNNN has an AC input with DC terminals configuration.

It also uses an EMC filtering arrangement.

The configuration is associated with a removed common-mode capacitor jumper.

These details matter during installation because the catalog number is not simply a horsepower identifier.

Different suffix configurations can affect electrical characteristics, filtering and installation requirements.

For replacement projects, the complete catalog number should therefore be compared.

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35. Dynamic Braking

This particular configuration does not include dynamic braking.

That is an important consideration for applications involving high-inertia loads.

If the mechanical system requires rapid deceleration or needs to dissipate substantial regenerative energy, the braking requirements should be evaluated separately.

Possible considerations include:

• Deceleration time
• Motor inertia
• Load inertia
• Regenerative energy
• Braking resistor requirements
• Mechanical braking
• Process stopping requirements

A no-dynamic-braking configuration should not automatically be considered unsuitable.

It simply means the braking strategy must be designed according to the actual application.

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36. Local Operator Interface

The catalog configuration is a blank / no-HIM arrangement.

This means the basic catalog configuration does not include a local Human Interface Module.

The drive can instead be operated through the control system and external control architecture.

For centralized industrial installations, this can be perfectly practical because the operator may interact with the machine through a plant HMI or supervisory control system rather than directly from the drive.

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37. Five Recommended Models from the Same PowerFlex 755 Series

The following models are useful alternatives or comparison points within the same high-power PowerFlex 755 family.

These models provide a useful progression around the 1,525 A target model.

The 20G11BD1K4AN0NNNNN is the closest lower-current alternative.

The 20G11BD2K0AN0NNNNN is the larger alternative when substantially more current and horsepower capacity are required.

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38. Detailed Comparison of Same-Series Models

The weight values in this comparison are planning-level values because actual packaged weight depends on the final equipment configuration.

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39. Five Same-Brand Popular and Related Models

For customers considering other products from the same brand, the following models represent different positions within the broader PowerFlex range.

These models should not all be considered direct substitutes.

The PowerFlex 525 and PowerFlex 527 are intended for much smaller applications.

The PowerFlex 753 and PowerFlex 755 platforms are more appropriate when advanced industrial motor control is required.

The 20G11BD1K5AN0NNNNN is specifically positioned for extremely large motor applications.

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40. Same-Brand Model Parameter Comparison

The smaller models are useful for comparison, but they are not appropriate replacements for a 1,525 A drive.

A replacement must be selected according to the actual motor current, load duty, mechanical requirements and control architecture.

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41. Application Suitability

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42. Advantages in Mining

Mining equipment can operate under changing and sometimes severe mechanical loads.

A high-power VFD can provide a more controlled motor response.

For conveyors, the drive can help control the starting process.

For large fans, it can regulate ventilation requirements.

For pumps, it can regulate water movement.

For processing machinery, it can provide variable motor speed.

The main advantages include:

• High current capability
• Large motor compatibility
• Controlled acceleration
• Controlled deceleration
• Variable-speed operation
• Automation integration
• Diagnostic information

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43. Advantages in Cement Plants

Cement plants commonly operate large fans, conveyors, pumps and material-processing machines.

The 20G11BD1K5AN0NNNNN is well suited to applications where motor power is extremely high and variable-speed operation provides a process advantage.

Large fans can benefit from adjustable airflow.

Conveyors can benefit from controlled acceleration.

Pumps can benefit from variable flow.

Process equipment can benefit from speed and torque control.

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44. Advantages in Water Systems

Large water infrastructure requires dependable pumping.

Variable-speed operation allows the pump motor to respond to changing demand.

This can be useful for:

• Water distribution
• Industrial water systems
• Cooling-water circulation
• Wastewater handling
• Process-water systems
• Large pumping stations

The main benefit is the ability to match pump operation more closely to the actual process requirement.

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45. Advantages in Conveyor Systems

Large conveyor systems can benefit from a high-power VFD because acceleration and deceleration can be controlled.

The drive can be used to manage:

• Starting speed
• Operating speed
• Acceleration time
• Deceleration time
• Motor torque
• Process coordination

This can help reduce mechanical shock and improve production control.

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46. Advantages in Large Fan Systems

Large fan systems frequently operate continuously.

Variable-speed control allows airflow to be adjusted.

Instead of running at full speed continuously, the motor can operate at the speed required by the process.

This can provide:

• Better airflow control
• Reduced throttling
• Potential energy savings
• Smoother startup
• Reduced mechanical stress
• Better process stability

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47. Maintenance Recommendations

A drive of this size should be included in a formal preventive-maintenance program.

Dust is particularly important in air-cooled high-power drives.

Dust accumulation can restrict airflow and increase thermal stress.

Regular inspection of cooling paths and fans can therefore be an important part of maintaining reliability.

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48. Installation Environment

The installation environment should be considered carefully.

Important factors include:

• Ambient temperature
• Humidity
• Dust
• Corrosive gases
• Altitude
• Vibration
• Airflow
• Electrical noise
• Cabinet ventilation
• Maintenance access

The drive should be installed in an environment appropriate for its specified enclosure and environmental ratings.

For harsh industrial environments, additional enclosure or environmental protection may be necessary.

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49. Cable and Motor Considerations

At 1,525 A, motor-cable engineering becomes particularly important.

The cable system must be selected according to:

• Motor current
• Cable length
• Installation method
• Ambient temperature
• Cable grouping
• Voltage drop
• Motor insulation
• Grounding
• EMC considerations

Long motor cables can also affect reflected-wave behavior and motor insulation stress.

For large installations, the complete motor-drive-cable system should therefore be considered together.

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50. Replacement Considerations

The 20G11BD1K5AN0NNNNN is a discontinued configuration.

The corresponding direct replacement configuration is:

20G11BD1K5JN0NNNNN

However, a replacement should not be selected simply because the replacement model has a similar horsepower rating.

The following should be checked:

A direct-replacement catalog number is a useful starting point, but the complete installation still needs to be evaluated.

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51. Why the Full Model Number Is Important

The complete catalog number contains configuration information.

The difference between:

20G11BD1K5AN0NNNNN

20G11BD1K5AN2NNNNN

20G11BD1K5AN4NNNNN

is not simply a cosmetic difference.

Different configurations can involve different electrical and filtering arrangements.

For this reason, the full catalog number should be recorded in:

• Purchasing documents
• Spare-parts lists
• Maintenance records
• Electrical drawings
• Equipment databases
• Replacement specifications
• Project documentation

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52. Advantages for Heavy Industrial Projects

The 20G11BD1K5AN0NNNNN offers several advantages when the application genuinely requires this level of power.

High Current Capacity

The 1,525 A rating allows control of extremely large AC motors.

High Horsepower

The 1,500 HP Light Duty rating is suitable for very large industrial machinery.

Variable-Speed Operation

The motor can operate according to process demand rather than simply running at fixed speed.

Controlled Acceleration

Large mechanical systems can be started more gradually.

Controlled Deceleration

High-inertia loads can be stopped in a more controlled manner.

Advanced Industrial Control

The PowerFlex 755 architecture is designed for demanding industrial motor applications.

Automation Integration

The drive can communicate with a larger industrial control system.

Air-Cooled Architecture

The drive does not require a dedicated liquid-cooling circuit.

Large MCC-Style Package

The packaged architecture is suitable for centralized industrial electrical installations.

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53. Recommended Selection by Application

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54. Quick Technical Reference

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55. Final Product Assessment

The 20G11BD1K5AN0NNNNN is a very large Allen-Bradley PowerFlex 755 AC drive designed for demanding industrial motor-control applications.

With an approximate 1,525 A current rating and ratings of approximately 1,500 HP Light Duty, 1,350 HP Normal Duty and 1,100 HP Heavy Duty, it is positioned toward the very-high-power end of the low-voltage AC-drive market.

The 480 VAC three-phase electrical configuration makes it suitable for large industrial power systems.

The Frame 10, 600 mm-deep MCC-style package and air-cooled construction are appropriate for large centralized electrical installations.

Its most important applications include mining conveyors, cement equipment, large pumps, large fans, blowers, water infrastructure, material-handling equipment, steel and metals processing and other large industrial machines.

The biggest practical advantage is not simply the horsepower rating.

The real value is the ability to control a very large motor in a more flexible manner.

The drive can regulate motor speed, manage acceleration, manage deceleration and participate in a broader industrial automation system.

For a large pump, this can mean better flow control.

For a large fan, it can mean better airflow regulation.

For a conveyor, it can mean smoother starting and stopping.

For mining equipment, it can mean better control of a high-inertia mechanical system.

For a cement or metals plant, it can provide a centralized high-power motor-control platform.

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56. Overall Specification Summary

In short, the 20G11BD1K5AN0NNNNN is best suited to very large industrial motor applications where high current capacity, variable-speed operation, controlled starting and stopping, and integration into an industrial control system are required. Its 1,525 A rating, 1,500 HP Light Duty capacity, Frame 10 construction and 600 mm MCC-style package make it a serious heavy-industry drive rather than a general-purpose compact inverter.