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Allen-Bradley 20G11BD960AN0NNNNN PowerFlex 755 AC Drive — Detailed Product Description, Technical Specifications, Applications and Advantages

1. Product Overview

The Allen-Bradley 20G11BD960AN0NNNNN is a high-power PowerFlex 755 AC drive designed for large industrial motor-control applications.

It belongs to the PowerFlex 750-Series, specifically the PowerFlex 755 family. This model is intended for large three-phase motors where high output current, variable-speed control, controlled acceleration and reliable industrial operation are required.

The drive is rated for 480 VAC, three-phase input and provides an output-current rating of 960 A. It uses a Frame 9, air-cooled construction with a 600 mm deep MCC-style enclosure.

The model is configured with no HIM, meaning Blank (No HIM). This configuration is appropriate for installations where the drive is operated primarily through an external control system, PLC, HMI, SCADA system or other automation equipment rather than through a permanently installed local keypad.

The 20G11BD960AN0NNNNN is a particularly large PowerFlex 755 configuration. Its power range makes it suitable for large pumps, fans, blowers, conveyors, mining equipment, cement machinery, water-treatment systems, material-handling equipment and other large industrial motor applications.

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2. Brand and Product Series

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3. Main Technical Parameters

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4. Power Rating

The 20G11BD960AN0NNNNN has three primary motor-duty ratings.

These three ratings are important when selecting the drive for an actual motor.

The drive should not be selected only by looking at the motor’s nameplate horsepower.

Motor full-load current, overload requirements, acceleration time, mechanical inertia, operating cycle and actual process load should all be considered.

For a large centrifugal fan or pump with relatively smooth loading, the Light-Duty or Normal-Duty rating may be appropriate depending on the application.

For a conveyor, crusher-related auxiliary system or other equipment with demanding acceleration and overload requirements, the Heavy-Duty rating may be more relevant.

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5. 960 Amp Output Capacity

The 960 A output rating is one of the most important characteristics of this model.

This is not a small machine-control drive.

It is designed for large industrial motors and large process equipment.

At this power level, electrical installation becomes a major part of the engineering work.

The system designer should consider:

• Incoming feeder capacity
• Motor cable capacity
• Busbar sizing
• Disconnect equipment
• Short-circuit protection
• Grounding
• Cable termination
• Cabinet ventilation
• Heat dissipation
• Maintenance clearance
• Floor loading
• Transportation
• Lifting arrangements

The high-current design gives the PowerFlex 755 a significant advantage in applications where a smaller VFD cannot provide enough current.

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6. 480 VAC Three-Phase Electrical System

The 20G11BD960AN0NNNNN is designed for a 480 VAC, three-phase industrial power system.

480 VAC is widely used in large industrial facilities.

The voltage class is suitable for applications where substantial motor power is required without using extremely high-voltage motor systems.

Typical facilities where this type of drive can be found include:

• Manufacturing plants
• Mining facilities
• Cement plants
• Water-treatment facilities
• Steel and metal-processing plants
• Large material-handling facilities
• Process plants
• Industrial utility systems

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7. AC Input With Precharge

This particular configuration uses AC input with precharge.

Precharge is important in large power-electronic systems because it helps control the initial charging of the DC bus when the drive is energized.

For a large 960 A-class drive, the DC bus contains substantial stored electrical energy.

The precharge arrangement forms part of the overall power-input architecture and should be considered during installation and service.

This is also one reason why proper lockout/tagout, discharge procedures and qualified electrical personnel are essential when working on a drive of this size.

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8. Embedded Ethernet/IP

The PowerFlex 755 platform provides embedded Ethernet/IP communication.

This allows the drive to become part of a larger industrial automation system.

A typical architecture may look like:

PLC / Controller

↓

Industrial Ethernet Network

↓

PowerFlex 755

↓

960 A Industrial Motor

↓

Pump / Fan / Conveyor / Process Equipment

This arrangement can allow the control system to exchange operating information with the drive.

Depending on the overall system design, the automation system can manage functions such as:

• Start and stop commands
• Speed reference
• Status
• Fault information
• Operating parameters
• Process control
• Diagnostic information
• Drive monitoring

This reduces the need to operate the drive manually.

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9. Blank / No HIM Configuration

The AN0 configuration uses a Blank / No HIM arrangement.

HIM means Human Interface Module.

Unlike configurations that include a door-mounted or enhanced local keypad, the AN0 version does not provide a dedicated local HIM as part of this catalog configuration.

This can be an advantage when the drive is integrated into a centralized automation system.

For example, a plant may have:

• PLC control
• Central HMI
• SCADA
• Control-room monitoring
• Ethernet/IP communications

In such an installation, a local keypad may not be necessary.

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10. Why a No-HIM Configuration Can Be Useful

A no-HIM configuration can provide a clean and simple installation when the drive is intended to be controlled remotely.

The control architecture can be centralized.

Operators can interact with the motor through a plant HMI or supervisory system rather than physically standing beside the drive.

This is particularly useful when the VFD is installed inside a dedicated electrical room.

The absence of a local HIM can also be appropriate for applications where local operator access is intentionally restricted.

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11. Product Introduction

The PowerFlex 755 is a high-performance industrial variable-frequency drive platform designed for applications where motor speed and process control are important.

A conventional motor starter generally provides basic motor switching.

A variable-frequency drive provides much more control.

The drive can change motor speed by controlling the frequency and voltage supplied to the motor.

This allows the motor to operate according to actual process requirements rather than simply running continuously at one fixed speed.

For large industrial systems, this can improve process flexibility and, in some applications, reduce unnecessary energy consumption.

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12. Basic Operating Principle

The operating concept can be simplified as:

480 VAC Three-Phase Power

↓

PowerFlex 755 AC Drive

↓

Variable-Frequency AC Output

↓

Large AC Motor

↓

Mechanical Equipment

↓

Industrial Process

The drive receives electrical power from the plant distribution system.

It converts and controls the electrical energy delivered to the motor.

The output frequency and voltage are adjusted according to the required operating condition.

This makes it possible to control motor speed and acceleration rather than simply switching the motor between OFF and full-speed operation.

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13. Variable-Speed Control

Variable-speed control is one of the main reasons to use a PowerFlex 755.

Different industrial machines require different operating speeds.

For example, a pump may need high flow during one part of a process and significantly lower flow during another.

A fan may need maximum airflow only during peak production.

A conveyor may need to run at different speeds depending on production throughput.

The VFD provides the electrical control needed to accommodate these changes.

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14. Controlled Acceleration

Large motors can create significant mechanical stress when started abruptly.

The PowerFlex 755 can provide controlled acceleration.

Instead of immediately applying full operating speed, the motor can be brought up to speed according to a programmed acceleration profile.

This can help reduce mechanical shock.

Applications where this can be especially useful include:

• Large conveyors
• Large fans
• Pumps
• Blowers
• Material-handling equipment
• High-inertia machines

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15. Controlled Deceleration

The same principle applies when stopping the motor.

A controlled deceleration profile can bring the machine down from operating speed more gradually.

This can reduce sudden mechanical changes.

However, because this model does not include dynamic braking, the deceleration characteristics of high-inertia loads must be evaluated carefully.

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16. Dynamic Braking

The specified model has:

Dynamic Braking: None

This is an important application consideration.

When a motor decelerates, the rotating mechanical system can return energy toward the drive.

For low-inertia loads, this may not present a significant problem.

For high-inertia loads, the regenerated energy can become substantial.

Therefore, applications involving large rotating masses should be evaluated carefully.

Possible approaches can include:

• Longer deceleration times
• Mechanical braking
• Appropriate external braking solutions
• Regenerative system design

The correct solution depends on the actual load and required stopping time.

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17. EMC Filtering

The model is configured with an EMC filter.

Electromagnetic compatibility is important in industrial environments because VFD switching can produce high-frequency electrical noise.

The overall installation should consider:

• Motor cable routing
• Cable shielding
• Grounding
• Bonding
• Control cable separation
• Communication cable routing
• Motor-frame grounding
• Cabinet grounding

The drive’s EMC filter is an important component, but it should be regarded as part of the complete EMC installation strategy rather than as a replacement for proper wiring practices.

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18. CM Jumper Removed

The specified configuration has the CM jumper removed.

This configuration affects the common-mode electrical behavior of the drive and should be considered during system grounding and EMC design.

When replacing an existing PowerFlex drive, engineers should compare the complete catalog number rather than assuming that two drives with the same current rating are electrically identical.

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19. Frame 9 Construction

The drive uses Frame 9 construction.

Frame size is important because it affects the physical arrangement of the power section, cooling system, installation space and mechanical interface.

A Frame 9 unit is significantly larger than compact VFDs used for smaller machines.

The frame designation should therefore be considered during:

• Cabinet design
• Mechanical replacement
• Transportation
• Lifting
• Maintenance planning
• Cable installation

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20. Dimensions

The specified package uses a 600 mm deep MCC-style enclosure.

The exact overall height and width can depend on the final configuration.

Therefore, the following information is appropriate for preliminary engineering rather than fabrication-level mechanical drawings.

The 600 mm depth should be included when planning the electrical-room footprint.

However, the drive should not be treated as a 600 mm × 600 mm box.

Additional space is required for:

• Incoming power cables
• Motor cables
• Cable bending radius
• Ventilation
• Maintenance
• Electrical clearances
• Access to internal components

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21. Weight

The 20G11BD960AN0NNNNN is a large industrial drive.

For preliminary transportation and installation planning, it should be treated as equipment in approximately the 1,000 kg class.

The exact net and shipping weights can vary according to the final configuration and packaging arrangement.

For an actual installation, the final configured mechanical documentation should be used for floor loading, lifting and transportation calculations.

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22. Enclosure and Protection

The drive package is specified as Type 1 / IP20.

This is important because the drive should normally be installed in a suitable controlled electrical environment.

The IP20 rating does not mean the drive can simply be installed outdoors or exposed directly to rain, washdown water or severe environmental contamination.

A suitable installation area should provide protection from:

• Water
• Excessive dust
• Corrosive gases
• Severe contamination
• Excessive humidity
• Excessive temperature

The overall electrical-room environment should be considered as part of the drive installation.

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23. Air-Cooled Design

The 20G11BD960AN0NNNNN is an air-cooled / forced-air drive.

At 960 A, the amount of heat generated by the power electronics is significant.

Proper airflow is therefore critical.

The electrical room or enclosure arrangement should provide adequate ventilation.

Important factors include:

• Ambient temperature
• Airflow
• Fan condition
• Air filter condition, where applicable
• Dust accumulation
• Cabinet ventilation
• Heat rejection
• Room temperature

Poor airflow can cause excessive thermal stress and shorten component life.

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24. Large Pump Applications

Large pumps are one of the most suitable application areas for this drive.

A pump system may not always require maximum flow.

The process may change throughout the day.

With variable-speed control, pump speed can be adjusted according to:

• Flow
• Pressure
• Tank level
• Production demand
• Cooling demand
• Process requirements

This can be more efficient than operating the pump at full speed continuously and controlling flow mainly through mechanical throttling.

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25. Large Fan Applications

Large industrial fans can also benefit from variable-speed operation.

Applications include:

• Industrial ventilation
• Mine ventilation
• Cement plant exhaust
• Process ventilation
• Cooling systems
• Dust collection
• Combustion air

The drive can allow the fan to operate at different speeds depending on the actual airflow requirement.

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26. Blower Applications

Industrial blowers frequently operate under changing process conditions.

The 960 A PowerFlex 755 can be considered for large blower applications where substantial motor power is required.

Typical uses include:

• Process air
• Aeration
• Industrial ventilation
• Pneumatic conveying
• Combustion systems
• Dust collection
• Process cooling

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27. Conveyor Applications

Large conveyors can have substantial mechanical inertia.

A VFD provides the ability to accelerate the motor progressively.

This can reduce sudden mechanical loading on:

• Belts
• Gearboxes
• Couplings
• Shafts
• Pulleys
• Bearings

The speed can also be adjusted according to the required production rate.

For large conveyor systems, the correct duty classification should be selected based on the actual load cycle and starting requirements.

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28. Mining Applications

Mining systems often contain large electrical motors.

The 20G11BD960AN0NNNNN can be considered for:

• Large conveyors
• Ventilation fans
• Dewatering pumps
• Material-handling systems
• Processing equipment
• Transfer systems

Mining applications can place significant demands on equipment because of dust, vibration and heavy mechanical loading.

The drive should therefore be installed in an appropriately controlled electrical environment.

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29. Cement Industry Applications

Large cement plants use many high-power motors.

Typical applications include:

• Large process fans
• Exhaust fans
• Conveyors
• Blowers
• Pumps
• Material-handling systems
• Cooling equipment

The PowerFlex 755’s high current capacity makes it suitable for large auxiliary and process motors.

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30. Water and Wastewater Applications

Large water and wastewater facilities often rely on high-power pumps.

Potential applications include:

• Raw-water pumps
• Transfer pumps
• Cooling-water systems
• Wastewater pumps
• Flood-control pumps
• Process-water systems

Variable-speed operation can provide better control over pressure and flow.

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31. Steel and Metal-Processing Applications

Large metal-processing facilities use high-power motors in many auxiliary processes.

Potential applications include:

• Cooling-water pumps
• Large ventilation fans
• Process blowers
• Conveyors
• Material-handling systems
• Auxiliary process equipment

The high current rating gives the drive considerable capacity for large industrial motors.

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32. Main Product Advantages

32.1 High 960 A Output Capacity

The 960 A current rating is the most obvious advantage of this model.

It allows the drive to control very large motors that are beyond the range of compact industrial VFDs.

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32.2 900 HP Light-Duty Rating

The 900 HP Light-Duty rating provides a substantial motor-control capacity.

This makes the drive particularly appropriate for large pumps, fans and other continuously operating equipment.

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32.3 800 HP Normal-Duty Rating

The 800 HP Normal-Duty rating gives additional flexibility for applications with moderate overload requirements.

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32.4 700 HP Heavy-Duty Rating

The 700 HP Heavy-Duty rating provides a substantial motor capacity for applications with higher torque or overload requirements.

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32.5 Embedded Ethernet/IP

The built-in Ethernet/IP capability allows the drive to be integrated into a modern industrial automation system.

This is particularly useful when the motor is controlled from a centralized PLC or supervisory system.

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32.6 Flexible Variable-Speed Control

The drive can operate the motor at different speeds.

This is valuable for:

• Pumps
• Fans
• Blowers
• Conveyors
• Process machinery

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32.7 Controlled Acceleration

Large machines can be started according to a programmed acceleration profile.

This can reduce mechanical shock.

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32.8 Air-Cooled Architecture

The forced-air cooling arrangement is suitable for large industrial electrical rooms where sufficient ventilation can be provided.

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32.9 MCC-Style Package

The 600 mm deep MCC-style construction is suitable for centralized industrial electrical installations.

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32.10 No-HIM Configuration

The Blank / No HIM configuration can be advantageous where local keypad operation is not required.

The drive can instead be controlled and monitored through an external automation system.

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33. Energy-Saving Potential

Variable-frequency drives can offer substantial energy-saving opportunities in applications where the process demand changes.

This is particularly relevant to centrifugal pumps and fans.

For example, if a fan does not need maximum airflow continuously, reducing motor speed can reduce the mechanical power requirement.

The same principle applies to pumps.

However, actual energy savings depend on:

• Motor efficiency
• Pump or fan design
• System curve
• Operating hours
• Load profile
• Required pressure
• Required flow
• Control strategy

Energy savings should therefore be calculated from actual operating data.

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34. Advantages for Automation Systems

The 20G11BD960AN0NNNNN is well suited to centralized automation architectures.

A typical system can include:

PLC

↓

Ethernet/IP

↓

PowerFlex 755

↓

Large Motor

↓

Industrial Process

The PLC can manage the operating sequence while the drive handles motor-speed control.

This allows the drive to become part of the overall process-control system rather than functioning as an isolated motor starter.

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35. Advantages for Large Industrial Plants

Large plants often have many motors distributed throughout the facility.

A centralized automation strategy can simplify operation.

Instead of requiring an operator to physically access every drive, the control system can provide a central location for monitoring and operation.

This can be especially useful when drives are installed in electrical rooms away from the production area.

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36. Maintenance Considerations

A high-power air-cooled drive should be included in a preventive-maintenance program.

Because this particular model has no local HIM, maintenance personnel may rely more heavily on the plant HMI, PLC, network interface or other external diagnostic equipment.

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37. Installation Requirements

A 960 A drive requires careful electrical and mechanical planning.

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38. Electrical Installation Considerations

At 960 A, the electrical installation is considerably more demanding than that of a small VFD.

Engineers should pay close attention to:

• Incoming conductor size
• Busbar capacity
• Terminal arrangements
• Short-circuit protection
• Grounding
• Cable routing
• Motor cable length
• EMC
• Harmonic considerations
• Heat generation
• Maintenance access

The VFD should be treated as part of the complete power system.

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39. Mechanical Installation Considerations

The physical size and weight of the equipment also require planning.

Important considerations include:

• Door clearance
• Electrical-room access
• Transportation route
• Lifting equipment
• Floor loading
• Foundation condition
• Cable entry
• Ventilation
• Service access
• Replacement access

The approximate 1,000 kg-class weight means that ordinary manual handling is not appropriate.

Proper lifting and transportation equipment should be planned before delivery.

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40. Recommended Same-Series Models

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

These models are useful when the required motor current or horsepower is different from the 960 A configuration.

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41. Same-Series Mechanical Comparison

The 600 mm depth is the common package class for these configurations.

Exact height, width and final net weight should be confirmed from the specific mechanical configuration before fabrication or installation.

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42. Five Related Models and Their Applications

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43. Five Same-Brand Popular / Related Models

The following models represent useful products from the same Allen-Bradley PowerFlex range, covering smaller machine applications through large industrial drives.

These products are not interchangeable simply because they are part of the same overall PowerFlex family.

Their power range, frame size, application architecture and control capabilities are different.

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44. Same-Brand Parameter Comparison

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45. Application Suitability

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46. Duty Selection Guide

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47. Why Choose the 20G11BD960AN0NNNNN?

The 20G11BD960AN0NNNNN is a strong choice when the motor requires a high-capacity 480 VAC drive but does not require a local HIM.

Its 960 A output rating provides substantial motor capacity.

Its 900 HP Light-Duty rating makes it suitable for very large continuously operating loads.

The 800 HP Normal-Duty and 700 HP Heavy-Duty ratings provide additional application flexibility.

The PowerFlex 755 architecture also makes the drive suitable for sophisticated industrial automation systems.

The embedded Ethernet/IP capability is particularly useful where the VFD needs to communicate with a PLC, HMI or supervisory control system.

The Blank / No HIM configuration is well suited to installations where centralized control is preferred.

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48. Comparison With the 800 A Version

The 960 A version sits immediately above the 800 A-class configuration in terms of current capacity.

The 960 A version provides additional current and horsepower capacity while retaining the same general high-power PowerFlex 755 architecture.

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49. Replacement Considerations

The original 20G11BD960AN0NNNNN has been discontinued.

The associated direct replacement is 20G11BD960JN0NNNNN.

For a replacement project, the complete catalog number should always be compared.

Important points include:

A replacement should not be selected based solely on the output-current number.

The complete configuration must be reviewed.

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50. Maintenance and Service Advantages

Although this model does not include a local HIM, it can still be integrated into a sophisticated maintenance strategy.

The drive can be monitored through the plant’s control architecture.

Technicians can use the automation system to inspect relevant drive information.

This is especially useful when the VFD is installed in an electrical room that is separate from the production area.

For large plants, centralized monitoring can make it easier to identify problems before they become major process interruptions.

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51. Long-Term Operating Advantages

When properly selected and installed, the 20G11BD960AN0NNNNN can provide:

• High motor-current capacity
• Large horsepower capability
• Variable-speed control
• Controlled acceleration
• Controlled deceleration
• Centralized automation
• Ethernet/IP integration
• Industrial-scale construction
• Air-cooled operation
• MCC-style installation
• Flexible process control
• Potential energy savings
• Reduced mechanical stress

The actual benefits depend on the machine, process and control strategy.

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52. Complete Technical Specification Table

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53. Final Product Summary

The Allen-Bradley 20G11BD960AN0NNNNN is a high-capacity PowerFlex 755 AC variable-frequency drive designed for large industrial motor applications.

Its 960 A output capacity, 900 HP Light-Duty rating, 800 HP Normal-Duty rating and 700 HP Heavy-Duty rating place it firmly in the high-power industrial-drive category.

The 480 VAC three-phase electrical design makes it suitable for large industrial motor systems commonly found in manufacturing, mining, cement, water, metals and process industries.

The Frame 9, air-cooled, Type 1 / IP20, 600 mm deep MCC-style construction is intended for centralized industrial electrical installations.

The model’s Blank / No HIM configuration is particularly suitable for installations where local keypad operation is not required and the drive is instead controlled through a PLC, HMI, SCADA system or Ethernet/IP-based automation architecture.

Its embedded Ethernet/IP capability allows it to become an integrated part of the plant automation system rather than operating as an isolated motor controller.

The model is particularly well suited to large pumps, fans, blowers, conveyors, mining equipment, cement machinery, water-transfer systems, wastewater equipment, material-handling systems and large process motors.

The major advantages are its high current capacity, large horsepower capability, variable-speed operation, controlled acceleration, centralized automation capability, industrial construction and flexible application range.

For centrifugal pumps and fans, variable-speed operation can potentially reduce energy consumption when process demand varies.

For large conveyors and high-inertia equipment, controlled acceleration can reduce mechanical shock and provide smoother operation.

Because the drive is a very large 960 A unit, electrical, mechanical and thermal installation requirements should be treated seriously.

The 600 mm depth should be included in preliminary layout planning, while the exact overall height and width should be confirmed from the final mechanical configuration.

For transportation and floor-loading planning, the equipment should be treated as approximately 1,000 kg class, with the final net and shipping weight confirmed from the actual configured equipment documentation.

Overall, the 20G11BD960AN0NNNNN is a powerful high-end PowerFlex 755 configuration for large industrial motor-control systems where a compact drive is not sufficient and where high current, large motor capacity, variable-speed control and integration with a centralized automation system are required.