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Allen-Bradley 20G11BD800AN2NNNNN PowerFlex 755 AC Drive — Detailed Product Description and Technical Guide

1. Product Overview

The Allen-Bradley 20G11BD800AN2NNNNN is a high-power PowerFlex 755 AC variable frequency drive designed for large industrial motor-control applications.

It belongs to the PowerFlex 750-Series, with the specific product family being PowerFlex 755. This is a large-frame, air-cooled industrial drive intended for applications where motor speed, acceleration, deceleration, torque and process operation need to be controlled electronically.

The model is built for a 480 VAC, three-phase electrical system and has an 800 A output-current rating. It is a Frame 9 unit with an air-cooled construction and a 600 mm deep MCC-style enclosure arrangement. The configuration includes a door-mounted HIM, making local drive operation and maintenance more convenient.

The rated motor capacity is approximately 800 HP for Light Duty, 700 HP for Normal Duty and 600 HP for Heavy Duty. In practical terms, this puts the drive in the high-power industrial category and makes it suitable for large pumps, fans, blowers, conveyors, material-handling equipment and other heavy-duty machinery.

The catalog number is important because the different suffixes within the PowerFlex 755 family can represent differences in display configuration, braking, filtering, enclosure arrangement and other options.

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2. Brand and Product Series

The combination of the PowerFlex 755 platform and the 800 A current rating makes this model fundamentally different from compact drives intended for small machinery.

It is designed for large-scale industrial systems where the motor and driven equipment can have substantial inertia, torque requirements and continuous operating loads.

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3. Main Technical Parameters

The horsepower figures should be understood according to the applicable duty classification.

A drive rated at 800 HP Light Duty is not automatically an 800 HP Heavy Duty drive. The allowable motor load depends on the duty profile, overload requirements, operating cycle and actual motor current.

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4. Horsepower and Kilowatt Capacity

The three primary ratings can be summarized as follows.

The approximate kilowatt values are based on the conventional conversion of 1 HP ≈ 0.746 kW.

For actual engineering selection, motor nameplate current is more important than simply converting horsepower to kilowatts.

A motor with unusual efficiency, power factor or service conditions can have a current requirement that differs from what a simple horsepower calculation would suggest.

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5. Product Introduction

The PowerFlex 755 is an industrial variable-frequency drive platform intended for demanding motor-control applications.

A conventional fixed-speed motor system normally operates the motor at one primary speed, with process control being achieved through mechanical methods such as valves, dampers, clutches or other equipment.

A variable-frequency drive changes this approach.

The drive controls the electrical power supplied to the motor, allowing the motor’s operating speed to be adjusted according to the process requirement.

For a large industrial motor, this can provide much more flexibility than simple motor starting and stopping.

The 20G11BD800AN2NNNNN is designed for exactly this type of high-power motor-control environment.

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6. Basic Operating Principle

The general power flow can be represented as:

480 VAC Three-Phase Supply

↓

PowerFlex 755 Drive

↓

Controlled AC Output

↓

Large Industrial Motor

↓

Gearbox / Coupling / Mechanical System

↓

Industrial Process

The drive receives three-phase AC power from the plant electrical system.

The internal power electronics convert and control the electrical energy so that the motor receives an output with the required frequency, voltage and current characteristics.

By changing the output frequency, the drive can regulate motor speed.

By controlling acceleration and torque, the drive can also influence how the motor interacts with the mechanical load.

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7. 800 A Output Current

The 800 A output rating is one of the most important specifications of this model.

An 800 A industrial drive belongs to a completely different equipment class from compact 10 A, 20 A or 50 A drives.

At this current level, the electrical installation becomes a major part of the engineering project.

The system may require substantial:

• Input conductors
• Output conductors
• Busbars
• Disconnect equipment
• Protection equipment
• Grounding conductors
• Cabinet ventilation
• Cable termination hardware
• Maintenance space

The high current capacity is particularly useful for large industrial motors where smaller drive platforms would not provide sufficient current capability.

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8. 480 VAC Three-Phase Operation

The model is intended for a 480 VAC three-phase industrial power system.

480 VAC is commonly encountered in large industrial facilities.

This makes the drive appropriate for equipment such as:

• Large pumps
• Large fans
• Blowers
• Conveyors
• Mining machinery
• Cement-process equipment
• Water-treatment machinery
• Steel-processing auxiliary systems
• Material-handling equipment

The complete electrical installation must be designed around the actual plant voltage, available fault current, protection system and motor requirements.

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9. Air-Cooled Construction

The drive uses forced-air cooling.

This is an important consideration because an 800 A drive can generate substantial heat during operation.

The cooling system must have sufficient airflow to remove heat from the power electronics.

The installation should therefore consider:

• Room temperature
• Airflow
• Cabinet ventilation
• Cooling fan condition
• Air intake cleanliness
• Exhaust clearance
• Dust accumulation
• Electrical-room heat load

Air-cooled equipment can be very practical in a properly designed electrical room, but the cooling path must be maintained throughout the operating life of the drive.

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10. Frame 9 Construction

The Frame 9 designation identifies the physical and electrical size category of the drive.

Frame size is important because it influences:

• Physical dimensions
• Power-handling capability
• Cooling arrangement
• Cable termination
• Installation requirements
• Service access
• Cabinet layout

The Frame 9 construction is appropriate for the substantial current rating of this model.

It should not be treated like a compact wall-mounted drive.

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11. 600 mm Deep MCC-Style Construction

The specified package is approximately 600 mm deep and uses an MCC-style arrangement.

This is particularly useful in large industrial electrical installations where drives are installed alongside other motor-control equipment.

The mechanical design should provide adequate space for:

• Incoming power cables
• Motor cables
• Control wiring
• Communication wiring
• Cooling airflow
• Door operation
• HIM access
• Maintenance
• Electrical clearances

The 600 mm value refers to the package depth and should not be interpreted as the complete installation footprint.

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12. Dimensions

For this model, the 600 mm package depth is the key confirmed mechanical dimension.

The exact overall height and width can vary depending on the final packaged arrangement.

For that reason, they should be treated as configuration-dependent rather than assigning an artificial single dimension.

For an actual installation, the final mechanical drawing should be used to determine cabinet width, height, cable-bending space and service clearance.

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13. Weight

This is a large industrial drive, and its weight should be treated as a significant installation consideration.

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

The exact net weight and shipping weight can vary according to the final enclosure and packaging arrangement.

For crane, forklift and foundation calculations, the final equipment documentation should always be used rather than relying on the approximate planning figure.

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14. Door-Mounted HIM

The AN2 configuration includes a door-mounted HIM.

The Human Interface Module provides local access to drive information and operating functions.

This can be useful during:

• Commissioning
• Startup
• Troubleshooting
• Maintenance
• Parameter checking
• Fault investigation
• Local status monitoring

For a large industrial drive installed in a motor-control area, having the interface available at the door can reduce the need for technicians to access the internal electrical components simply to inspect operating information.

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15. AN2 Versus AN0 Configuration

The AN2 suffix is important because it distinguishes this model from other closely related configurations.

For example, the 20G11BD800AN0NNNNN has the same general power class but is configured differently with regard to the operator interface.

This difference matters when replacing existing equipment.

If the original system relies on a door-mounted operator interface, selecting an otherwise similar model without the appropriate interface configuration may require additional modification.

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16. Dynamic Braking

The specified configuration has no dynamic braking.

This does not mean that the drive cannot decelerate a motor.

It means that the catalog configuration does not include an integrated dynamic-braking arrangement for dissipating regenerated energy.

This is especially important for high-inertia loads.

Applications such as:

• Large conveyors
• High-inertia fans
• Large rotating equipment
• Material-handling machinery

may require an evaluation of how stored mechanical energy will be managed during deceleration.

Depending on the application, engineers may use a longer deceleration time, mechanical braking or another suitable braking strategy.

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17. EMC Filter Configuration

The model is associated with an EMC-filtered configuration.

EMC considerations become increasingly important in large VFD installations.

The drive uses high-frequency switching as part of its normal operation.

The overall installation should therefore consider:

• Grounding
• Shielding
• Cable routing
• Motor-cable length
• Control-cable separation
• Communication wiring
• Cabinet bonding
• Motor-frame grounding

A good EMC installation is a system-level design issue rather than something determined by the drive alone.

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18. CM Jumper Configuration

The specified configuration has the common-mode jumper removed.

This is another example of why the complete catalog number matters.

The configuration of common-mode grounding and filtering can influence the way the drive interacts with the plant electrical system.

When replacing the drive, engineers should compare the existing installation with the new configuration rather than assuming that all PowerFlex 755 units are electrically identical.

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19. Applications

The 20G11BD800AN2NNNNN is particularly suitable for large industrial equipment.

Its high current capacity makes it useful for applications where a substantial motor must be operated under controlled speed.

Typical application areas include:

1. Large centrifugal pumps
2. Industrial fans
3. Large blowers
4. Mining conveyors
5. Cement-process equipment
6. Steel and metal-processing auxiliary systems
7. Water-transfer systems
8. Wastewater systems
9. Material-handling equipment
10. Large ventilation systems
11. Process machinery
12. High-power industrial rotating equipment

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20. Large Pump Applications

Large pumps are one of the most natural applications for high-power VFDs.

A fixed-speed pump often runs at one operating speed while valves are used to regulate the process.

A VFD allows the pump speed itself to be changed.

This can provide:

• Flow control
• Pressure control
• Smoother starting
• Reduced mechanical stress
• Reduced throttling
• Potential energy savings

For a large water-transfer or industrial process pump, the ability to continuously adjust speed can be much more useful than simply switching the motor between ON and OFF.

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21. Large Fan Applications

Large fans can consume substantial power.

Many industrial ventilation systems do not require maximum airflow all the time.

The drive can reduce fan speed when less airflow is required and increase speed when process demand rises.

Typical applications include:

• Mine ventilation
• Cement-process ventilation
• Industrial exhaust
• Steel-process ventilation
• Dust extraction
• Cooling systems
• Combustion-air systems

This type of application can also provide an opportunity for energy optimization when the process has a variable airflow requirement.

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22. Blower Applications

Industrial blowers are used in many processes where air movement is an important part of production.

Potential applications include:

• Process air
• Combustion air
• Aeration
• Pneumatic conveying
• Dust extraction
• Industrial ventilation

The drive can adjust blower speed according to process demand.

This makes the system more flexible than a fixed-speed blower arrangement.

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23. Conveyor Applications

Large conveyors can present significant starting challenges.

A long belt carrying bulk material can have considerable inertia.

Starting too aggressively can produce mechanical shock throughout the system.

A controlled acceleration profile can help reduce stress on:

• Conveyor belts
• Gearboxes
• Couplings
• Drive pulleys
• Shafts
• Mechanical joints

The ability to control conveyor speed is also useful when production throughput changes.

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24. Mining Applications

Mining facilities often contain some of the largest motor systems found in industry.

The drive can be considered for:

• Mine conveyors
• Ventilation fans
• Dewatering pumps
• Material transfer equipment
• Processing machinery
• Large blowers

Mining environments can contain substantial dust and can place heavy demands on electrical equipment.

For that reason, the electrical-room environment and cooling system should be carefully designed.

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25. Cement Industry Applications

Cement plants frequently use large motors for:

• Process fans
• Exhaust fans
• Blowers
• Conveyors
• Pumps
• Material-handling systems
• Ventilation

The PowerFlex 755 platform is well suited to this type of large motor application because it provides variable-speed control rather than simple fixed-speed operation.

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26. Steel and Metals Applications

Steel and metal-processing plants can require large motors for auxiliary and process systems.

Potential applications include:

• Cooling-water pumps
• Large fans
• Blowers
• Conveyors
• Ventilation equipment
• Material handling
• Process auxiliary machinery

The drive’s high current capacity makes it suitable for large motors where compact drive products would not be appropriate.

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27. Water and Wastewater Applications

Large water systems often have pumps operating for long periods.

The drive can regulate pump speed based on process requirements.

Applications may include:

• Raw-water transfer
• Industrial water
• Cooling-water circulation
• Wastewater pumping
• Flood-control pumping
• Process-water systems

Variable-speed control can provide smoother operation and more flexible process management.

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28. Material-Handling Applications

The drive can also be used for large material-handling systems.

Examples include:

• Bulk-material conveyors
• Mining transfer systems
• Cement conveyors
• Port handling systems
• Industrial conveyors
• Large production transfer systems

The combination of high current capacity and adjustable speed is useful where mechanical loads change significantly during production.

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29. Main Product Advantages

29.1 High Current Capacity

The 800 A output rating makes the drive suitable for very large industrial motors.

This is one of its most important advantages.

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29.2 High Horsepower Capability

The drive can support up to approximately 800 HP Light Duty.

This makes it suitable for applications that would normally require a large centralized drive installation.

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29.3 Three Duty Ratings

The Light Duty, Normal Duty and Heavy Duty classifications allow engineers to select the appropriate operating level based on the actual motor load.

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29.4 Adjustable Motor Speed

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

This is especially valuable for pumps, fans, blowers and conveyors.

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29.5 Controlled Acceleration

Large mechanical systems can be brought up to speed progressively.

This can reduce mechanical shock and improve startup behavior.

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29.6 Controlled Deceleration

The motor can be brought down in speed according to a programmed stopping profile.

This is useful for large rotating machinery.

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29.7 Local HIM

The door-mounted HIM provides convenient local access for commissioning and maintenance.

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29.8 Industrial-Scale Construction

The Frame 9 and MCC-style construction are appropriate for large industrial installations.

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29.9 Broad Application Range

The drive can be used in mining, cement, water, metals, material handling, pumping and ventilation.

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29.10 Potential Energy Optimization

When used with suitable centrifugal pumps and fans, variable-speed operation can reduce unnecessary motor speed and potentially reduce energy consumption.

The actual savings depend heavily on the process and load profile.

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30. Energy-Saving Characteristics

One of the strongest arguments for using a VFD is the ability to match motor speed to actual process demand.

For example, a pump may need full output during peak demand but only partial output at other times.

A fixed-speed motor continues operating at full speed unless another form of control is used.

With a VFD, the motor speed can be reduced.

The same principle applies to large fans and blowers.

This can provide:

• Lower operating speed when demand is low
• Better process control
• Reduced throttling
• Reduced mechanical stress
• Potentially lower energy consumption

Energy savings should always be calculated using the actual load curve rather than assumed from motor horsepower alone.

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31. Installation Considerations

An 800 A drive requires a properly engineered electrical installation.

Important areas include:

At this power level, installation quality has a major effect on long-term reliability.

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32. Maintenance

A large air-cooled drive should be included in a planned preventive-maintenance program.

The cooling system deserves particular attention.

If airflow becomes restricted, internal component temperatures can increase.

This is especially important in dusty industrial environments.

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33. Environmental Conditions

The installation environment should be evaluated before placing the drive into service.

Important factors include:

• Ambient temperature
• Humidity
• Dust
• Vibration
• Corrosive atmosphere
• Altitude
• Water exposure
• Ventilation
• Contamination

A clean electrical room provides a much better environment than an installation located directly beside a dusty process.

The enclosure rating does not eliminate the need for proper environmental planning.

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34. Five Recommended Same-Series / Closely Related Models

The following five models are useful comparisons within the PowerFlex 755 high-power family.

These models are useful when the motor current is higher or lower than the 800 A capacity of the main model.

The 20G11BD800AN0NNNNN is particularly close electrically, while the larger-current models provide a natural progression for higher-power motors.

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35. Same-Series Model Comparison With Mechanical Information

The dimensional and weight figures in this comparison are planning-level values. Exact height, width and equipment weight can change with the specific packaged configuration.

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36. Five Same-Brand Related / Popular Models

The following models represent different product levels within the same Allen-Bradley drive portfolio.

These products are not direct substitutes for one another.

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

The PowerFlex 753 and 755 families cover more demanding industrial applications.

The 20G11BD800AN2NNNNN sits at the high-power end of this comparison.

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37. Detailed Comparison of Related Models

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38. Application Suitability Table

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39. Recommended Duty by Application

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40. Why the Model Is Suitable for Large Pumps

A large pump system may not need full motor speed at all times.

For example, if the process requires lower flow during certain operating periods, the motor can be operated at a lower speed.

This provides more direct control of the pump itself rather than depending entirely on mechanical throttling.

For large installations operating many hours per day, this can make variable-speed operation particularly attractive.

The actual energy benefit depends on the pump curve, system curve, operating schedule and process requirements.

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41. Why the Model Is Suitable for Large Fans

Large fans often have highly variable process requirements.

A ventilation system may require high airflow during production but substantially lower airflow during other periods.

The drive can change fan speed according to the requirement.

This can provide:

• Better airflow control
• Better pressure control
• Lower unnecessary speed
• Smoother startup
• Potential energy reduction

This is especially relevant to industrial ventilation, cement plants, mining operations and large process systems.

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42. Why the Model Is Suitable for Conveyors

Large conveyors have mechanical inertia and may be heavily loaded during startup.

The drive can provide a controlled acceleration ramp.

This can reduce the shock associated with directly starting a large motor.

The ability to control conveyor speed can also allow the production process to operate at different throughput levels.

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43. Why the Model Is Suitable for Mining

Mining operations can require very large motors for:

• Conveying
• Pumping
• Ventilation
• Material transfer
• Processing

The 800 A rating gives this drive enough capacity for many large motor installations.

The main engineering challenge is often not the drive itself but the environment around it.

Dust, heat, vibration and maintenance access should all be considered.

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44. Why the Model Is Suitable for Cement

Cement production contains many large motor-driven systems.

Large fans, blowers, conveyors and pumps can all benefit from variable-speed operation.

The ability to control motor speed according to process demand can provide more flexibility than fixed-speed operation.

The electrical-room location should also protect the equipment from excessive dust contamination.

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45. Why the Model Is Suitable for Water Systems

Water infrastructure often requires large pumps that operate continuously.

The demand can change depending on:

• Tank level
• Pipeline pressure
• Flow demand
• Production schedule
• Water consumption

The drive can adjust motor speed to match the actual requirement.

This makes it a practical solution for large industrial pumping systems.

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46. Product Selection Considerations

When selecting this model, the following points should be checked carefully:

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47. Maintenance and Service Advantages

The door-mounted HIM can make troubleshooting more convenient.

Maintenance personnel can inspect drive information without immediately opening the main electrical enclosure.

A structured maintenance program should include:

• Cooling inspection
• Fan inspection
• Electrical connection inspection
• Grounding inspection
• Cable inspection
• Fault-history review
• Temperature monitoring
• Environmental inspection

This approach is particularly important for large drives because unexpected downtime can affect a major production system.

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48. Replacement Model

The original 20G11BD800AN2NNNNN has reached discontinued status.

The direct replacement associated with this catalog number is:

20G11BD800JN2NNNNN

However, a replacement should not be selected simply because the replacement has a similar catalog number.

A proper replacement review should include:

• Motor current
• Motor horsepower
• Duty rating
• Input voltage
• Frame
• Mechanical dimensions
• HIM configuration
• Communication system
• Braking requirements
• Motor feedback
• EMC configuration
• Existing control logic
• Cabinet arrangement

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49. Important Note About Dimensions and Weight

For this model, the 600 mm depth is a useful mechanical reference.

The exact height and width should be treated as configuration-dependent.

Likewise, the 1,000 kg-class weight is appropriate for preliminary planning but should not be treated as a certified shipping weight.

For a real installation, transportation or replacement project, the final configured mechanical documentation should be used.

This is especially important because the equipment is large enough that lifting, transportation and floor loading can become significant engineering issues.

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50. Complete Product Specification Summary

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51. Final Technical Assessment

The Allen-Bradley 20G11BD800AN2NNNNN is a high-power industrial variable-frequency drive designed for large three-phase motor applications.

Its 800 A output capability places it in a high-power class suitable for large industrial equipment rather than compact machinery.

The 800 HP Light Duty, 700 HP Normal Duty and 600 HP Heavy Duty ratings give engineers different operating ranges depending on the mechanical load and duty cycle.

The 480 VAC three-phase input, Frame 9 construction, air-cooled design, 600 mm deep MCC-style package, Type 1/IP20 enclosure and door-mounted HIM make it well suited to centralized industrial electrical installations.

Its strongest application areas include large pumps, industrial fans, blowers, conveyors, mining equipment, cement equipment, water-transfer systems, wastewater systems, steel and metal-processing support equipment and large material-handling machinery.

The main advantages are high current capacity, large motor capability, adjustable speed, controlled acceleration, controlled deceleration, local operator access and suitability for integration into larger industrial control systems.

For pumps and fans, variable-speed operation can improve process control and may provide meaningful energy savings where the process load varies.

For conveyors and heavy machinery, controlled acceleration and deceleration can reduce mechanical shock and provide smoother operation.

For mining, cement and other demanding industries, the high-power architecture provides the capacity required by large motors.

The most important selection point is to match the drive to the actual motor current, duty cycle, overload requirement, starting torque, inertia, braking requirements and operating environment.

The complete catalog number should also be retained when specifying, replacing or purchasing the equipment because seemingly similar PowerFlex 755 configurations can have different interface and hardware arrangements.

Overall, the 20G11BD800AN2NNNNN is best suited to large-scale industrial motor-control applications where a conventional starter is insufficient and reliable variable-speed control is required.