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20G11BF960AN2NNNNN – Detailed Product Overview, Technical Parameters, Applications, Advantages and Related Models

1. Product Overview

The 20G11BF960AN2NNNNN is a high-power AC variable-frequency drive from the PowerFlex 755 product family.

It is designed for large industrial motor-control applications where high current capacity, controlled acceleration and deceleration, adjustable motor speed, and reliable integration into an industrial automation system are required.

The model is a 690 VAC three-phase, 960 A, air-cooled drive in Frame 9. Its configuration includes AC input with precharge and an EMC filter, while dynamic braking is not included in this particular configuration.

The complete catalog number is important because the suffix identifies the drive configuration. The 20G11BF960AN2NNNNN should therefore be treated as a specific configured product rather than simply a generic 960 A drive.

The model has been discontinued, so it is particularly relevant for existing installations, maintenance projects, replacement planning, spare-parts management, and legacy industrial equipment.

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2. Brand and Series

The PowerFlex 755 family is intended for demanding industrial applications where a simple compact VFD is not sufficient.

It is especially suitable for large motors and machines that require accurate speed control, controlled acceleration, high current capability, and integration with plant-level automation.

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3. Main Product Parameters

The dimensions and weight should be regarded as planning values rather than final fabrication dimensions.

For a replacement project, the actual mechanical drawing associated with the complete configuration should always be used before preparing the foundation, cabinet opening, lifting arrangement, or cable-entry system.

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4. Electrical Characteristics

The most important electrical characteristic of this model is its 960 A current class at 690 VAC.

This places the drive in the high-power industrial category.

A 690 VAC system is commonly used for large industrial motors because increasing the motor voltage allows the required power to be transmitted at a lower current than would be required at a lower voltage.

The drive is intended for three-phase AC motor applications.

The actual motor power that can be connected should not be determined from voltage and current alone.

Motor efficiency, power factor, duty rating, overload requirement, ambient temperature, installation conditions, and the applicable drive rating all influence the final selection.

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5. Frame Size

The 20G11BF960AN2NNNNN uses Frame 9.

Frame 9 indicates that this is a physically large industrial drive.

It is very different from compact machine-level variable-frequency drives.

The physical installation should therefore be planned at the engineering stage.

Particular attention should be given to:

• Floor loading.
• Cabinet structure.
• Ventilation.
• Cable routing.
• Maintenance access.
• Lifting access.
• Electrical clearances.
• Cooling-air circulation.

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6. Dimensions

For preliminary layout purposes, the 690 VAC Frame 9 configuration can be considered approximately within the following dimensional class.

These figures are suitable for preliminary planning only.

The exact dimensions can depend on the enclosure and packaged configuration.

For manufacturing a cabinet, foundation, lifting frame, or transport fixture, the exact mechanical drawing should be used.

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7. Weight

The 20G11BF960AN2NNNNN is a very large piece of industrial electrical equipment.

A planning weight of approximately 1,200 kg is appropriate for preliminary handling calculations.

The actual shipping weight can differ from the installed equipment weight depending on packaging and configuration.

For transportation and lifting calculations, the actual equipment documentation should be checked.

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8. Product Introduction

The primary function of the drive is to convert fixed-frequency AC electrical power into controlled variable-frequency AC power for the motor.

This allows the motor’s speed and torque to be controlled according to the requirements of the machine.

The basic operating sequence can be represented as:

Three-Phase AC Input

↓

AC Input and Precharge

↓

DC Bus

↓

Power Inverter

↓

Variable-Frequency AC Output

↓

Three-Phase Motor

↓

Industrial Machine

This arrangement provides much greater control than simply switching a motor directly on and off.

For large industrial machinery, this difference can be extremely important.

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9. Controlled Motor Starting

One of the major advantages of using a variable-frequency drive with a large motor is controlled starting.

A large motor started directly from the electrical supply can create a substantial starting current and mechanical shock.

With a VFD, the motor can accelerate gradually.

This can reduce mechanical stress on:

• Motor shafts.
• Gearboxes.
• Couplings.
• Conveyor belts.
• Bearings.
• Pumps.
• Fans.
• Process machinery.

The acceleration profile can be selected according to the requirements of the machine.

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10. Adjustable Motor Speed

The drive allows the motor speed to be adjusted according to the process requirement.

This is particularly useful when the machine does not always need to operate at full speed.

Typical operating conditions can include:

• Low-speed startup.
• Normal production speed.
• Reduced-speed operation.
• Process-controlled speed.
• Controlled shutdown.

This makes the drive useful for machines where production requirements change during operation.

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11. Product Applications

11.1 Large Conveyors

Large conveyors are one of the most suitable applications for a high-current drive.

Mining, aggregate, cement, steel, port, and bulk-material facilities can use very large motors for conveyor systems.

The drive can provide:

• Controlled acceleration.
• Adjustable conveyor speed.
• Controlled stopping.
• Reduced mechanical shock.
• Better coordination with other conveyor sections.
• Improved production control.

For a long conveyor belt, gradual acceleration can be especially valuable because sudden torque changes can place significant stress on the belt and mechanical transmission system.

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11.2 Mining Equipment

Large mining systems frequently require very high-power motors.

Potential applications include:

• Ore conveyors.
• Coal conveyors.
• Material transfer systems.
• Large dewatering pumps.
• Mine ventilation systems.
• Processing equipment.
• Crushing and material-handling equipment.

The 690 VAC / 960 A capability makes this model appropriate for very large motor applications when the motor’s actual electrical requirements fall within the applicable drive rating.

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11.3 Cement Plants

Cement and mineral-processing facilities use large motors throughout the production process.

Potential applications include:

• Large fans.
• Material conveyors.
• Process blowers.
• Large pumps.
• Material-handling equipment.
• Processing machinery.
• Auxiliary production equipment.

The drive’s high current capacity makes it suitable for large continuous-duty machinery.

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11.4 Large Pumps

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

Applications may include:

• Water transfer.
• Cooling-water circulation.
• Industrial process water.
• Mine dewatering.
• Wastewater handling.
• Large circulation systems.

Instead of operating continuously at one fixed speed, the pump can be controlled according to the process demand.

This can improve process flexibility and, in suitable applications, reduce energy consumption.

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11.5 Large Fans and Blowers

Large fans and blowers are another common application for high-power drives.

Possible applications include:

• Industrial ventilation.
• Furnace air systems.
• Process exhaust.
• Dust collection.
• Cooling systems.
• Combustion-air systems.
• Large air-handling equipment.

The drive allows airflow to be adjusted by changing motor speed.

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12. Industrial Automation Applications

The PowerFlex 755 platform is suitable for integration into larger industrial automation systems.

A drive can become more than a simple motor starter.

It can provide information and control functions associated with:

• Motor speed.
• Motor current.
• Operating status.
• Fault status.
• Drive alarms.
• Start/stop control.
• Speed references.
• Process coordination.

This makes it suitable for factories where motor control must be coordinated with PLCs, HMIs and other automation equipment.

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13. Main Product Advantages

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14. Advantage: High-Power Capability

The most obvious advantage of the model is its high current capacity.

At 960 A, this is not a small or medium industrial drive.

It is intended for applications where the motor itself is a major component of the production system.

This makes it suitable for:

• Very large conveyors.
• Large pumps.
• Large fans.
• Heavy material-handling machinery.
• Mining equipment.
• Cement equipment.
• Process machinery.

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15. Advantage: Reduced Mechanical Shock

Starting and stopping large machinery can place significant loads on mechanical components.

A controlled acceleration ramp can reduce the sudden application of torque.

This may help reduce stress on:

• Gearboxes.
• Shafts.
• Couplings.
• Belts.
• Bearings.
• Chains.
• Mechanical transmission components.

The actual benefit depends on the machine design and the selected acceleration profile.

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16. Advantage: Process Flexibility

A fixed-speed motor provides limited operating flexibility.

A variable-speed drive allows the machine to operate at different speeds.

For example, a material-handling machine may use:

This makes the drive valuable in production environments where operating conditions frequently change.

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17. Advantage: Better Motor Control

The drive can regulate motor operation rather than simply energizing or de-energizing the motor.

This provides better control of:

• Speed.
• Torque.
• Acceleration.
• Deceleration.
• Direction.
• Operating status.

Such control is particularly useful for large machinery.

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18. EMC Filter

The AN2 configuration includes an EMC filter.

Electromagnetic compatibility is important in industrial electrical systems because high-power drives use switching power electronics.

The switching process can generate electrical interference.

Good system design should therefore consider:

• Motor cable routing.
• Shielding.
• Grounding.
• Bonding.
• Separation of power and control cables.
• Cabinet design.
• Motor grounding.

The internal EMC filter is one part of the overall EMC strategy.

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19. AC Input with Precharge

The drive uses an AC input configuration with precharge.

Precharge is particularly important for high-power drives because the DC bus contains substantial energy-storage components.

At startup, the DC-bus capacitors need to be charged in a controlled manner.

The precharge circuit helps limit the initial charging current.

This becomes increasingly important as the size of the drive increases.

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20. Dynamic Braking

This specific configuration does not include dynamic braking.

This is an important consideration for high-inertia machinery.

When a large motor decelerates, the mechanical energy stored in the rotating system can be returned to the electrical system through the motor and drive.

If the application requires rapid stopping, the braking-energy requirement must be evaluated.

Possible applications requiring particular attention include:

• Large conveyors.
• Large fans.
• Centrifuges.
• High-inertia machinery.
• Large rotating equipment.
• Rapid-cycle systems.

The absence of internal dynamic braking does not prevent the drive from being used in such systems.

It means the braking system must be designed according to the actual mechanical energy and required stopping time.

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21. Environmental and Installation Considerations

The drive should be installed in a suitable industrial electrical environment.

Particular attention should be given to:

• Ambient temperature.
• Humidity.
• Dust.
• Condensation.
• Corrosive gases.
• Conductive contamination.
• Ventilation.
• Cooling airflow.
• Cabinet cleanliness.

High-power air-cooled equipment generates substantial heat.

The electrical room and enclosure ventilation system therefore need to be designed accordingly.

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22. Detailed Technical Specification Table

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23. Five Same-Series or Closely Related Models

The following models are closely related to the 960 A configuration and are useful for comparing different current ratings and configurations within the PowerFlex 755 family.

These models are useful when the motor current is below the maximum requirement of the 960 A configuration.

The correct selection should be based on the motor nameplate current, overload requirements, duty cycle, ambient conditions and application characteristics rather than simply selecting the largest available drive.

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24. Same-Series Model Comparison

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25. Five Related Models from the Same Product Portfolio

For applications that do not require the extremely high current capacity of the 960 A configuration, smaller models from the same overall product portfolio may be considered.

These products are not all direct replacements for one another.

They represent different power ranges and application levels.

The smaller products are more appropriate for machine-level applications, while the 20G-series products are intended for very large industrial motors.

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26. Five Popular Models for Brand-Level Comparison

The products at the top of the table are considerably smaller than the 20G11BF960AN2NNNNN.

They are therefore better considered as portfolio alternatives rather than direct one-for-one replacements.

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27. Comparison of High-Power Models

The 960 A version provides greater current capacity than the 765 A and 795 A versions.

This can provide additional capacity when the motor’s operating current is close to the upper range of the smaller configurations.

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28. Typical Conveyor Application

A typical large conveyor system can be arranged as follows:

Main Power Supply

↓

High-Power Variable-Frequency Drive

↓

Large AC Motor

↓

Gearbox

↓

Drive Pulley

↓

Conveyor Belt

The drive controls the motor during acceleration, normal operation and shutdown.

For long conveyors, a gradual acceleration profile can help reduce sudden mechanical loading.

This is especially valuable when the belt is heavily loaded.

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29. Typical Pump Application

A typical large pump system can use the drive between the electrical supply and motor.

The drive controls motor speed according to the required process condition.

The system can therefore operate at different speeds rather than being limited to a single fixed operating point.

Potential advantages include:

• Better flow control.
• Better pressure control.
• Smooth startup.
• Reduced mechanical stress.
• Flexible process operation.
• Potential energy savings.

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30. Typical Fan Application

A large industrial fan can use variable-speed control to adjust airflow.

Instead of running continuously at full speed, the drive can adjust the motor according to the actual requirement.

Potential applications include:

• Furnace systems.
• Industrial ventilation.
• Process exhaust.
• Dust collection.
• Cooling systems.
• Air-handling systems.

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31. Maintenance Recommendations

For a high-power drive, preventive maintenance is particularly important.

A small ventilation problem can become a serious thermal problem when the equipment operates continuously at high load.

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32. Installation Considerations

Before installation, the following should be evaluated.

Electrical

• 690 VAC supply compatibility.
• Three-phase power.
• Protective-device coordination.
• Short-circuit conditions.
• Grounding system.
• Motor rated current.
• Motor rated voltage.
• Motor insulation.
• Cable sizing.
• Cable routing.

Mechanical

• Floor loading.
• Drive dimensions.
• Cabinet dimensions.
• Maintenance clearance.
• Cable-entry space.
• Door access.
• Lifting access.
• Transportation route.

Thermal

• Ambient temperature.
• Ventilation.
• Airflow.
• Heat dissipation.
• Cabinet cooling.
• Electrical-room temperature.

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33. Important Point About Model Selection

The 20G11BF960AN2NNNNN should not be selected solely because the motor has a high horsepower rating.

The motor’s nameplate current is one of the most important selection parameters.

For example:

The correct drive should be selected according to the complete motor and machine operating profile.

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34. Catalog Number Considerations

The complete catalog number is:

20G11BF960AN2NNNNN

The different portions of the catalog number identify different aspects of the drive configuration.

For replacement work, it is therefore important to compare the complete number.

A product with the same:

20G11BF960

prefix may still have a different configuration.

The suffix can affect important installation characteristics.

For this reason, replacing a unit based only on voltage and current is not recommended.

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35. Replacement and Legacy Equipment

This model is a discontinued configuration.

For an existing machine, the original catalog number remains valuable because it identifies the equipment installed in the system.

It can be useful for:

• Maintenance records.
• Spare-parts lists.
• Electrical drawings.
• Equipment inventories.
• Existing cabinet documentation.
• Retrofit planning.
• Troubleshooting.

A replacement should be evaluated against the complete application rather than simply matching the current rating.

The successor configuration associated with this model is:

20G11BF960JN2NNNNN

The replacement should be checked for mechanical, electrical, control, communication and installation compatibility before being considered a direct field replacement.

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36. Overall Product Advantages

The 20G11BF960AN2NNNNN is particularly strong in applications where a very large motor must be controlled smoothly and continuously.

Its main advantages can be summarized as follows:

1. Very high 960 A current capacity.
2. 690 VAC industrial voltage class.
3. Suitable for very large motors.
4. PowerFlex 755 high-performance drive architecture.
5. Controlled acceleration and deceleration.
6. Adjustable motor speed.
7. Suitable for heavy industrial machinery.
8. EMC filter configuration.
9. AC input with precharge.
10. Air-cooled high-power construction.
11. Suitable for automated production systems.
12. Wide application range across mining, cement, material handling, pumps and fans.

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37. Final Summary

The 20G11BF960AN2NNNNN is a high-power PowerFlex 755 AC variable-frequency drive designed for large industrial motor applications.

Its principal electrical characteristics are a 690 VAC three-phase input class and 960 A current rating.

The drive uses Frame 9 construction and air cooling, making it substantially larger and heavier than ordinary industrial VFDs.

For preliminary mechanical planning, a dimensional class of approximately 1,440 mm × 900 mm × 800 mm and a weight of approximately 1,200 kg can be used.

These dimensions and weight should be treated as approximate planning values, with the final mechanical drawing used for actual installation.

The configuration includes AC input with precharge and an EMC filter, while dynamic braking is not included.

The product is particularly appropriate for large conveyors, mining equipment, cement-processing equipment, large pumps, large fans, blowers, bulk-material handling equipment and other heavy industrial machinery.

The biggest practical advantage is the combination of very high current capacity and variable-speed motor control.

For large machines, this can provide smoother acceleration, better speed regulation, reduced mechanical shock and improved process flexibility.

The closest related models include the 650 A, 710 A, 765 A and 795 A configurations in the same high-power family.

For smaller industrial applications, lower-capacity products in the broader PowerFlex portfolio can be considered, but they are not direct substitutes for a 960 A / 690 VAC Frame 9 drive.

For an existing installation, the complete catalog number 20G11BF960AN2NNNNN should be retained exactly in maintenance records and spare-parts documentation.

The most important selection parameters remain the motor’s rated voltage, full-load current, overload requirement, duty cycle, ambient conditions, braking requirement and actual machine load profile.