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Allen-Bradley 20G11BF960JN2NNNNN — Detailed Product Information, Technical Parameters, Applications, Advantages and Related Models

1. Product Overview

The 20G11BF960JN2NNNNN is a high-power air-cooled AC drive from the PowerFlex 755 series. It is designed for large industrial motor applications where high output current, controlled acceleration and deceleration, variable-speed operation, process integration and reliable long-term operation are required.

This model is a 690 VAC, three-phase, 960 A drive with a Frame 9 power section. Its rated power capability is approximately 1000 kW for light-duty applications, 900 kW for normal-duty applications and 800 kW for heavy-duty applications.

Compared with smaller variable-frequency drives, this model is intended for large pumps, fans, compressors, conveyors, process machinery and other high-power rotating equipment.

The JN2 configuration is particularly important because it differs from the JN0 configuration in the human-machine-interface arrangement. The JN2 version is equipped with an enhanced LCD, full-numeric HIM, making local monitoring, parameter adjustment and drive operation more convenient.

The drive uses an AC input with precharge and DC terminals, includes filtering, has the common-mode capacitor jumper installed, and does not include dynamic braking as a standard feature.

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2. Basic Product Information

Dimension and weight note: The approximately 2000 × 600 × 600 mm envelope and 1246 kg weight should be treated as engineering reference values for this packaged Frame 9 configuration. Actual overall dimensions and shipping weight can change with the exact cabinet arrangement, accessories, installation configuration and packaging. For cabinet fabrication, transportation, foundation design and lifting calculations, the exact mechanical drawing for the supplied unit should be used.

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3. What Is the 20G11BF960JN2NNNNN?

The 20G11BF960JN2NNNNN is a high-capacity industrial variable-frequency drive intended to control large AC motors.

Its primary purpose is to convert incoming electrical power into controlled variable-frequency and variable-voltage output power for an AC motor.

By changing the output frequency, the drive can control motor speed. By controlling voltage, current and motor-control parameters together, it can also regulate torque and acceleration characteristics.

For a large motor, this provides considerably more control than simply connecting the motor directly to the electrical supply.

The model is particularly suited to industrial equipment that needs controlled starting, adjustable speed, controlled stopping, process-based speed regulation and integration with a plant automation system.

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4. Product Series: PowerFlex 755

The PowerFlex 755 is a high-performance industrial AC drive family intended for demanding motor-control applications.

The series covers a broad range of power levels and configurations, including compact and cabinet-based arrangements as well as large high-current packaged drives.

The 20G11BF960JN2NNNNN belongs to the high-power end of this family.

The series is characterized by:

• Advanced AC motor control
• High-power motor operation
• Flexible control architecture
• Industrial network integration
• Modular options
• Diagnostic functions
• Multiple feedback possibilities
• Application-oriented configurations
• Large-motor support
• Flexible installation arrangements

For a 960 A, 690 V application, the PowerFlex 755 platform provides an appropriate architecture for large industrial motor systems where a basic-purpose VFD would normally be insufficient.

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5. Detailed Technical Parameters

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6. Understanding the 960 A Rating

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

This is not a small or medium-size machine drive. It is designed for large industrial motors.

At 690 V, a three-phase motor system operating at this current level represents a substantial amount of electrical power.

The 960 A rating allows the drive to support large motors used in applications where a high torque requirement, high continuous power demand or large mechanical system must be controlled.

When selecting this drive for a motor, however, the motor nameplate current should always be compared with the actual drive rating.

Motor power in kW alone is not enough for final selection.

The following factors should also be evaluated:

• Motor rated current
• Motor rated voltage
• Motor power
• Motor speed
• Motor overload requirement
• Starting torque
• Continuous torque
• Acceleration time
• Deceleration time
• Duty cycle
• Ambient temperature
• Altitude
• Motor cable length
• Harmonic requirements
• Braking requirements

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7. Light-Duty, Normal-Duty and Heavy-Duty Ratings

One of the useful characteristics of the product is that its power capability depends on the application duty.

The difference is important because two motors with the same nominal kW rating can impose very different demands on a drive.

A centrifugal fan normally has a different torque characteristic from a conveyor, crusher or high-inertia machine.

Therefore, the 900 kW normal-duty rating should not automatically be interpreted as meaning that every 900 kW motor can be operated under every operating condition.

The actual motor current, load profile and overload requirement should always be considered.

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8. Human-Machine Interface — JN2 Configuration

A particularly important feature of the 20G11BF960JN2NNNNN is its door-mounted enhanced LCD full-numeric HIM.

This makes the JN2 configuration different from a basic blank-HIM configuration.

The local interface can be used for functions such as:

• Viewing operating status
• Monitoring motor speed
• Monitoring current
• Checking drive faults
• Reviewing alarms
• Changing parameters
• Starting or stopping the drive when configured for local control
• Checking diagnostic information
• Viewing parameter values
• Adjusting operating settings

For a large industrial drive, having a local display is valuable during commissioning and maintenance.

Technicians can inspect drive status directly at the cabinet rather than depending entirely on the plant control system.

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9. Embedded EtherNet/IP

The embedded EtherNet/IP capability is another major feature.

The drive can be integrated into an industrial automation network and exchange information with control equipment.

Depending on the overall system architecture, the network can be used for:

• Start/stop commands
• Speed reference
• Actual speed feedback
• Current monitoring
• Torque monitoring
• Drive status
• Fault codes
• Alarm status
• Parameter access
• Diagnostic information
• Process interlocking

This makes the drive suitable for centralized automation architectures.

For a large pump station, conveyor system or process plant, the drive can therefore function as part of the complete control system rather than as an isolated motor controller.

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10. AC Input With Precharge

The model uses an AC input with precharge.

Precharge is important in high-power drives because the DC-link capacitors can represent a very substantial electrical load when initially energized.

The precharge function controls the initial charging process and helps prevent an excessive inrush current from being applied directly to the DC bus.

This becomes particularly important for high-power drives because the stored electrical energy and component sizes are much greater than those found in small VFDs.

The drive also provides DC terminals, giving the configuration additional flexibility for applications and system arrangements where the DC bus needs to be accessed.

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11. Filtering and CM Jumper

The drive is supplied in a filtered configuration and has the common-mode capacitor jumper installed.

This configuration is relevant to the electrical behavior of the drive system, particularly with respect to electromagnetic compatibility and common-mode effects.

For large motor installations, the following should still be considered:

• Motor cable construction
• Cable length
• Shielding
• Grounding
• Motor bearing protection where required
• Cabinet bonding
• System EMC requirements
• Input power quality

A drive’s internal filtering does not eliminate the need for proper system-level electrical engineering.

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12. Dynamic Braking

The standard configuration of this model has no dynamic braking.

This is an important selection point.

For applications where the motor must decelerate a large rotating mass quickly, the mechanical system may return energy to the drive DC bus during deceleration.

Examples can include:

• High-inertia fans
• Large centrifuges
• Conveyors
• Certain material-handling systems
• Large rotating machines

If rapid deceleration or regenerative energy management is required, the braking architecture should be evaluated separately.

A model without dynamic braking should not automatically be assumed to be suitable for every high-inertia application.

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13. Product Applications

13.1 Large Pumping Systems

The 20G11BF960JN2NNNNN is well suited to large pump installations.

Examples include:

• Water supply systems
• Industrial water circulation
• Cooling-water systems
• Wastewater pumping
• Process pumps
• Mining-water systems
• Large irrigation systems
• Chemical-process pumps

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

This can be particularly useful when the required flow varies throughout the operating cycle.

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13.2 Large Fans

Large fans are another suitable application.

Examples include:

• Industrial ventilation
• Furnace ventilation
• Cement-plant fans
• Steel-process ventilation
• Mining ventilation
• Dust extraction
• Combustion-air systems
• Large cooling fans

Fan loads are often suitable for variable-speed operation because process requirements can change substantially.

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13.3 Large Blowers

Industrial blowers can require hundreds of kilowatts of motor power.

Typical examples include:

• Process-air blowers
• Industrial exhaust systems
• Combustion blowers
• Wastewater aeration
• Pneumatic-process equipment
• Large dust-collection systems

The drive can provide adjustable motor speed and allow the blower to be integrated into a larger process-control system.

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13.4 Mining Conveyors

Large mining conveyors can impose significant starting torque and continuous-load requirements.

The PowerFlex 755 platform can be considered for:

• Ore conveyors
• Coal conveyors
• Aggregate conveyors
• Bulk-material handling
• Long-distance conveyors
• Transfer conveyors

Controlled acceleration can reduce mechanical shock on belts, couplings and gearboxes.

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13.5 Cement Equipment

Cement and mineral-processing equipment frequently uses large motors.

Possible applications include:

• Fans
• Crushers
• Conveyors
• Mills
• Blowers
• Material-handling systems
• Process pumps

The high-current Frame 9 architecture makes this product particularly relevant to the large end of the motor-power range.

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13.6 Large Compressors

Large compressors can also benefit from high-power variable-speed control.

Potential applications include:

• Industrial compressed-air systems
• Process compressors
• Gas-processing equipment
• Large refrigeration compressors
• Chemical-process machinery

Compressor selection requires additional consideration of minimum speed, acceleration characteristics, torque requirements and process control.

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14. Advantages of the 20G11BF960JN2NNNNN

14.1 Very High Power Capability

The first major advantage is its high power capacity.

With a light-duty rating of approximately 1000 kW, this drive belongs to the large industrial equipment category.

It can therefore be considered for motors far beyond the capacity of compact machine drives.

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14.2 960 A High-Current Output

The 960 A rating provides considerable motor-control capability.

This makes the product appropriate for large mechanical loads where high current is required to produce the necessary motor torque.

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14.3 690 V Three-Phase Architecture

690 V three-phase operation is useful for large industrial motor systems.

At high power levels, higher motor voltage can help keep the operating current within a manageable range compared with attempting to deliver the same power at substantially lower voltage.

This makes the drive suitable for industrial facilities designed around 690 V motor systems.

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14.4 Enhanced Local Display

The JN2 configuration includes an enhanced LCD full-numeric HIM.

This is useful during:

• Startup
• Commissioning
• Maintenance
• Troubleshooting
• Parameter adjustment
• Local diagnosis

A technician can obtain useful operating information directly from the drive cabinet.

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14.5 Embedded Industrial Networking

Embedded EtherNet/IP provides a convenient route to plant-level automation integration.

This is particularly valuable when many large drives need to be monitored from a central control system.

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14.6 MCC-Style Construction

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

It can be integrated into larger electrical equipment rooms where multiple motor-control systems are installed together.

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14.7 Air-Cooled Construction

Forced-air cooling provides a practical thermal-management method for this power class.

Compared with liquid-cooled systems, air-cooled construction can simplify certain maintenance tasks and facility requirements.

However, the cooling-air system must be properly maintained because dust, blocked filters, fan degradation and excessive ambient temperature can reduce equipment life.

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14.8 Flexible Industrial Applications

The drive can be applied to many types of large rotating equipment.

This flexibility is one of the strongest reasons to consider the PowerFlex 755 platform for a large industrial project.

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15. Installation Considerations

Because the drive weighs approximately 1246 kg, mechanical handling must be planned carefully.

The installation location should be capable of supporting the equipment weight.

The following should be evaluated before installation:

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16. Recommended Five Same-Series or Closely Related Models

The following models are useful for comparison within the same PowerFlex 755 family.

Comparison of the Five Related Models

20G11BF960JN0NNNNN is especially close electrically to the target model. The principal difference is the local interface configuration, making it a useful comparison when a door-mounted enhanced LCD HIM is not required.

20G11BF960JN4NNNNN is another very close 960 A configuration. It should be evaluated when different option arrangements are required.

20G11BE900JN2NNNNN moves down in current capacity and is appropriate when the motor does not require the full 960 A rating.

20G11BF795JN2NNNNN provides a lower-current alternative for applications with lower motor-power requirements.

20G11BF765JN2NNNNN is another lower-current Frame 9 option and can be considered where the process load falls below the 795 A range.

The three 960 A models are physically and electrically closer to the target model, while the 765 A, 795 A and 900 A models are useful where the drive can be downsized.

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17. Five Popular Allen-Bradley Models for Broader Comparison

The following five models represent popular drive families from the same brand but cover substantially different power ranges and applications.

These models should not be considered direct substitutes for one another.

The PowerFlex 525 and PowerFlex 523 are designed for much smaller machines.

The PowerFlex 753 occupies a higher-performance industrial-drive position and can be used for more demanding applications.

The PowerFlex 755 is intended for more advanced and higher-capacity motor-control requirements.

For a motor approaching the 800–1000 kW range, the 20G11BF960JN2NNNNN is naturally much more relevant than compact drives.

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18. Direct Comparison With 20G11BF960JN0NNNNN

The two models are particularly close.

The major practical difference is therefore the local HIM configuration.

If local operation and convenient cabinet-level monitoring are important, the JN2 configuration has a clear advantage.

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19. Advantages of Choosing the JN2 Configuration

For maintenance personnel, the JN2 configuration can be more convenient than a blank-HIM version.

A local display is particularly useful when commissioning a large motor because the technician can inspect drive parameters and operating conditions directly at the cabinet.

This can reduce the need to move repeatedly between the electrical room and the main control station.

It is also useful when troubleshooting faults.

For example, during startup the technician can check:

• Motor current
• Drive status
• Speed command
• Actual speed
• Fault condition
• Alarm condition
• Parameter settings
• Operating state

This makes the JN2 configuration a practical choice for large equipment that requires regular local maintenance.

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20. Typical Industries

The 20G11BF960JN2NNNNN can be considered for a variety of heavy industrial sectors.

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21. Why This Model Is Suitable for Large Industrial Equipment

The combination of 690 VAC, 960 A, Frame 9 and up to approximately 1000 kW light-duty capability places this model firmly in the high-power industrial category.

It is not simply a larger version of a small machine drive.

The complete system needs to be engineered around:

• High electrical current
• Large motor power
• Significant heat generation
• Large power cables
• High mechanical loads
• Industrial communication
• Cabinet ventilation
• Maintenance access
• Equipment weight
• Motor insulation
• Grounding
• EMC

This is why the PowerFlex 755 architecture is appropriate for applications where the motor drive is an important part of the overall plant process.

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22. Product Advantages Summary

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23. Final Product Assessment

The 20G11BF960JN2NNNNN is a high-capacity PowerFlex 755 Frame 9 air-cooled AC drive designed for large industrial motors.

Its core specification can be summarized as:

690 VAC / 3 Phase / 960 A / 1000 kW LD / 900 kW ND / 800 kW HD / Frame 9 / Air Cooled / IP20 Type 1 / 600 mm Deep MCC Style / AC Input with Precharge / DC Terminals / Filtered / CM Jumper Installed / No Dynamic Braking / Enhanced LCD Full Numeric Door-Mounted HIM / Embedded EtherNet/IP.

Its main strengths are its very high current capability, large motor-power capacity, industrial networking, local LCD interface, MCC-style installation and suitability for large continuous-duty machinery.

The JN2 configuration is especially attractive where local operation and maintenance are important, because the enhanced full-numeric LCD interface gives technicians direct access to drive information.

For applications such as large pumps, fans, blowers, compressors, mining conveyors, cement equipment, steel-processing machinery and other large rotating equipment, it provides a strong high-power drive platform.

When selecting one of the related models, the most important parameters to compare are motor current, voltage, duty rating, overload capability, braking requirements, enclosure configuration, filtering, HIM configuration, communication requirements, physical dimensions and weight.

For the specific 20G11BF960JN2NNNNN, the approximate 2000 × 600 × 600 mm physical envelope and 1246 kg weight should be considered during preliminary mechanical planning. Because this is a very large packaged drive, the final supplied configuration should be checked against its exact dimensional drawing before cabinet fabrication, transportation, lifting or foundation work.