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20G11BF1K0JN0NNNNN — Detailed Product Information, Technical Parameters, Applications, Advantages and Related Models

1. Product Overview

The 20G11BF1K0JN0NNNNN is a high-power air-cooled AC variable frequency drive from the PowerFlex 755 series.

It is designed for large industrial motor applications where high current capacity, controlled acceleration, adjustable motor speed, process regulation, and reliable integration with industrial automation systems are required.

With a rated current of approximately 1,040 A / 1.0 kA and a 690 VAC-class electrical configuration, this model is intended for very large motor systems. It is substantially larger than conventional machine-level variable frequency drives and is normally installed as part of a centralized industrial electrical system.

The model is particularly suitable for large pumps, fans, blowers, conveyors, compressors, mixers, mining equipment, material-handling systems, and other heavy industrial machinery.

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2. Brand and Product Series

The PowerFlex 755 series is intended for applications requiring more capability and flexibility than a basic variable-speed motor controller. It combines high-power motor control with industrial communication, application flexibility, and a wide range of configuration possibilities.

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3. Model Number

The complete catalog number is:

20G11BF1K0JN0NNNNN

The complete catalog number should be retained when purchasing, replacing, or comparing the drive.

The individual characters represent different elements of the drive configuration, including product family, voltage class, power/current class, enclosure or mechanical arrangement, filtering/common-mode configuration, braking configuration, and other factory options.

For this reason, two models that look very similar should not automatically be regarded as electrically or mechanically interchangeable.

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4. Main Technical Parameters

The physical size and weight of a large-frame drive can vary considerably according to cabinet construction, installed options, input/output arrangement, power components, disconnect equipment, reactors, braking equipment, and other factory-installed hardware.

For this reason, the dimensional and weight values above should be regarded as engineering-reference values for preliminary selection, not as a guaranteed shipping specification for every individual configuration.

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5. Electrical Specifications

The 20G11BF1K0JN0NNNNN is designed for the 690 VAC class.

This voltage class is particularly useful in large industrial plants because higher motor voltage allows very high motor power to be transmitted with lower current than would be required at a lower voltage.

The approximately 1,040 A current rating puts this drive into the very high-power industrial category.

A drive of this size is generally selected for motors in the hundreds of kilowatts up to approximately the megawatt range, depending on the motor’s actual voltage, current, duty cycle, overload requirements, and operating conditions.

The actual usable motor rating should always be determined from the motor’s nameplate current and the drive’s applicable duty rating rather than by simply converting horsepower or kilowatts.

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6. Duty Classification

One of the most important aspects of selecting a large variable frequency drive is understanding the difference between normal and heavy-duty operation.

The 20G11BF1K0JN0NNNNN belongs to a very high-power rating class, with approximately 1,100 kW Low Duty, 1,000 kW Normal Duty, and 900 kW Heavy Duty application capability.

Low Duty

Low Duty is generally associated with variable-torque applications such as large centrifugal pumps and fans.

These applications often have a more favorable torque-speed relationship, allowing the drive to provide a higher motor-power rating.

Normal Duty

Normal Duty provides a middle ground for general industrial motor applications.

It can be appropriate for machinery with relatively stable torque requirements and moderate acceleration demands.

Heavy Duty

Heavy Duty is more relevant when the motor must deliver high torque or repeatedly accelerate a heavy mechanical load.

Examples include heavy conveyors, certain crushers, mixers, material-handling equipment, and other machinery where high torque is required at low speed.

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7. Product Introduction

The 20G11BF1K0JN0NNNNN is fundamentally a high-power motor-control system.

Its primary purpose is to convert incoming AC electrical power into controlled variable-frequency AC power for a large three-phase motor.

The output frequency and voltage can be adjusted according to the required motor operating condition.

This allows the connected motor to operate at controlled speeds rather than simply running at the fixed speed associated with the incoming electrical frequency.

For industrial plants, this capability can be valuable for both process control and equipment protection.

A large pump, for example, may need full output during peak demand but substantially lower output during normal operation. A variable frequency drive can adjust the motor speed to match the process.

A large conveyor can also benefit from controlled acceleration and deceleration, reducing sudden mechanical stress on the belt, gearbox, shaft, coupling, and motor.

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8. High-Power Industrial Architecture

The 20G11BF1K0JN0NNNNN is not a compact wall-mounted inverter.

It belongs to a large-frame drive category and is normally incorporated into an industrial electrical-room installation.

The cabinet arrangement provides space for high-power electrical components, cooling equipment, control electronics, power connections, and service access.

This type of installation normally requires:

• Adequate electrical-room space
• Proper ventilation
• Appropriate incoming power protection
• Correct grounding
• Proper motor cable selection
• Adequate service clearance
• Suitable lifting equipment
• Appropriate floor loading
• Correct heat dissipation
• Suitable maintenance access

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9. Dimensions and Weight

Because this is a large-frame 690 VAC drive, physical dimensions are considerably larger than those of conventional low-power PowerFlex drives.

A practical preliminary dimension class is approximately:

The weight can vary significantly depending on the actual cabinet configuration.

For transportation and installation planning, the actual shipping weight of the finished unit should be used.

This is particularly important because a unit weighing more than one metric ton requires suitable lifting equipment, transportation planning, and structural evaluation.

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10. Product Applications

10.1 Large Industrial Pumps

Large process pumps are one of the most suitable applications for this class of drive.

Examples include:

• Water-transfer pumps
• Cooling-water pumps
• Process-water pumps
• Industrial circulation pumps
• Pipeline pumps
• Mine dewatering pumps
• Slurry-related pumping systems

The variable-speed function allows pump output to be adjusted according to process demand.

This can help avoid unnecessary full-speed operation when the required flow is lower.

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10.2 Large Fans

Large industrial fans can consume substantial amounts of electrical power.

Applications may include:

• Furnace fans
• Cooling fans
• Exhaust fans
• Ventilation systems
• Combustion-air systems
• Process-air systems
• Mining ventilation

The drive can adjust fan speed according to actual airflow requirements.

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10.3 Large Blowers

Process blowers frequently require continuous speed regulation.

A high-power variable-frequency drive allows the blower to respond to changing process conditions.

This is useful in manufacturing plants, processing facilities, ventilation systems, and other industrial installations.

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10.4 Large Conveyors

Large conveyors are particularly suitable for high-power drives.

The drive can provide controlled acceleration and deceleration, which may help reduce mechanical shock.

This can be beneficial for:

• Long belt conveyors
• Mining conveyors
• Bulk-material handling
• Ore transport
• Coal handling
• Port material handling
• Aggregate handling
• Large warehouse/process conveyors

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10.5 Mining Applications

Mining equipment frequently requires very large motors.

The 20G11BF1K0JN0NNNNN is suitable for evaluating applications such as:

• Mine ventilation
• Ore conveyors
• Material handling
• Large pumps
• Dewatering systems
• Processing equipment
• Large fans
• Heavy-duty conveyors

Mining applications should be evaluated carefully for enclosure, environmental conditions, mechanical load, dust, temperature, and required protection level.

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10.6 Compressors

Large compressors can benefit from controlled motor acceleration and adjustable operating speed.

The drive can help manage the motor’s operating point and reduce abrupt starting behavior.

The compressor type must be considered carefully because centrifugal, screw, reciprocating, and other compressor designs can have substantially different torque characteristics.

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10.7 Mixers and Agitators

Large mixers can require significant starting torque.

This is especially true when the machine starts with material already inside the mixing chamber.

A high-power drive can provide controlled acceleration and adjustable speed.

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10.8 Metals and Heavy Process Equipment

Large industrial processing systems can use this type of drive for:

• Cooling systems
• Large process fans
• Large pumps
• Material handling
• Processing machinery
• Production-line equipment
• Large mechanical drives

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11. Main Advantages

11.1 Extremely High Current Capacity

The approximately 1,040 A current rating is the most obvious advantage of this model.

It is designed for motor systems that are too large for ordinary industrial drives.

This makes it appropriate for high-capacity industrial installations.

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11.2 Suitable for Approximately 1 MW-Class Motors

The approximately 1,000 kW Normal Duty rating places this model in the megawatt-class motor-control category.

This is useful for large pumps, fans, conveyors, compressors, and process machinery.

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11.3 690 VAC Architecture

The 690 VAC class is well suited to large motors.

Higher voltage allows the same power to be transmitted with lower current compared with a lower-voltage motor system.

This can help make large motor installations more practical from an electrical-distribution perspective.

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11.4 Controlled Motor Starting

A high-power motor can place significant demand on an electrical system during startup.

The drive provides controlled acceleration rather than simply applying full line voltage to the motor.

This can help reduce mechanical shock and improve the starting process.

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11.5 Adjustable Speed

Motor speed can be changed according to process requirements.

This provides much greater process flexibility than a fixed-speed motor installation.

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11.6 Process Optimization

The ability to regulate motor speed can improve process control.

For variable-torque applications, particularly pumps and fans, the drive may also help reduce energy consumption when the process does not require maximum output.

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11.7 Industrial Communication

The PowerFlex 755 platform provides strong industrial-network integration capabilities.

The drive can exchange control and diagnostic information with a larger automation system.

This is particularly useful in plants with centralized monitoring and supervisory control.

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11.8 Suitable for Centralized Electrical Rooms

The large-frame cabinet architecture is appropriate for major industrial installations.

It can be incorporated into centralized motor-control areas where large drives and associated equipment are installed together.

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12. Five Related Models in the Same Series

The following models are useful when comparing this model with other PowerFlex 755 configurations.

The 600 VAC models are useful when the plant electrical system is based on 600 VAC.

The 690 VAC models are more appropriate for high-voltage motor systems designed around the 690 VAC class.

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13. Five Related Models — Detailed Comparison

These models should be considered related rather than automatically interchangeable.

The most important difference between the groups is the 600 VAC versus 690 VAC electrical system.

A 600 VAC drive should not be substituted for a 690 VAC drive without confirming the plant supply, motor nameplate voltage, insulation system, protection system, and complete electrical design.

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14. Five Popular Models From the Same Brand

The following models provide a useful range of smaller and larger drive configurations from the same brand.

The smaller models in this table are not direct substitutes for the 1,040 A unit.

They are included because they represent useful points across the same brand’s industrial variable-frequency-drive range.

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15. Application Comparison

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16. Energy-Saving Potential

One of the major reasons for using a variable frequency drive in industrial systems is the ability to regulate motor speed.

This is particularly important for centrifugal pumps and fans.

When the process requires less flow or airflow, reducing motor speed can be more efficient than keeping the motor at full speed and using mechanical restrictions to reduce output.

For large motors, even a relatively modest percentage improvement in operating efficiency can represent a significant amount of electrical energy over a long operating period.

The actual energy-saving result depends on:

• Motor efficiency
• Pump or fan design
• Operating hours
• Process demand
• Speed range
• Mechanical transmission efficiency
• System pressure
• Flow requirements
• Control strategy

The drive should therefore be evaluated as part of the complete motor-and-process system rather than as an isolated electrical component.

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17. Maintenance Advantages

The PowerFlex 755 architecture provides a structured platform for industrial maintenance.

Important maintenance areas include:

At the approximately 1 MW power level, preventive maintenance is especially important.

A failure in a large industrial drive can affect a major production process, so planned inspection and spare-parts management can be valuable.

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18. Installation Environment

The 20G11BF1K0JN0NNNNN is intended for industrial electrical environments.

However, the actual installation environment should be evaluated carefully.

Important considerations include:

Ambient temperature

High ambient temperature can reduce the available drive capacity and increase thermal stress.

Ventilation

The forced-air cooling system requires adequate airflow.

Dust

Heavy industrial dust can restrict airflow and contaminate cooling components.

Humidity

Excessive humidity and condensation can create electrical reliability problems.

Altitude

High-altitude installations can require derating because air density affects cooling.

Cable length

Long motor cables can create additional electrical stresses and should be evaluated as part of the drive and motor system.

Grounding

Large industrial drives require an appropriate grounding system.

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19. Advantages Compared With a Conventional Motor Starter

A conventional starter can still be suitable for motors that always need to operate at full speed.

However, when the process requires adjustable speed, controlled acceleration, or automation-system integration, a variable-frequency drive can offer substantially greater functionality.

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20. Important Replacement Considerations

When replacing an existing large drive, the current rating should not be the only consideration.

The following parameters should be checked:

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21. Why the 690 VAC Class Is Important

The 690 VAC class is particularly useful in large motor applications.

For a given power level, increasing voltage reduces the current required by the motor.

For example, a very large motor operating at 690 VAC can generally transfer its rated power at a lower current than an equivalent motor operating at a much lower voltage.

This can provide advantages in:

• Cable sizing
• Switchgear selection
• Busbar design
• Electrical distribution
• Motor connection
• Overall high-power system design

The 690 VAC class is therefore frequently associated with large industrial motors and high-power process equipment.

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22. Product Advantages Summary

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23. Complete Parameter Table

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24. Recommended Models at a Glance

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25. Final Product Evaluation

The 20G11BF1K0JN0NNNNN is a very large industrial variable-frequency drive designed for demanding high-power motor applications.

Its defining characteristics are the 690 VAC voltage class, approximately 1,040 A current rating, approximately 1 MW Normal Duty power class, large-frame cabinet construction, forced-air cooling, and industrial communication capability.

The model is particularly appropriate where a large motor needs controlled starting, adjustable speed, process regulation, and integration into a centralized industrial automation system.

Its strongest application areas are large pumps, fans, blowers, conveyors, mining equipment, compressors, mixers, and other high-power process machinery.

Compared with smaller drives, the main advantages are its very high current capacity, high motor-power capability, 690 VAC architecture, industrial communication, controlled acceleration, adjustable speed, and suitability for centralized high-power installations.

The most relevant related models are the 20G11BE825JN0NNNNN, 20G11BE900JN0NNNNN, 20G11BE980JN0NNNNN, 20G11BF590JN0NNNNN, and 20G11BF1K0JN0NNNNN itself as the high-capacity reference configuration.

For a 600 VAC system, the 20G11BE series is generally the more relevant group.

For a 690 VAC system, the 20G11BF series is the more appropriate comparison group.

For an existing installation, the final selection should always be based on the actual motor nameplate current, motor voltage, duty classification, overload requirement, torque curve, acceleration time, braking requirement, enclosure requirements, environmental conditions, communication system, cabinet dimensions, and actual equipment weight.

Because this is a large-frame drive, the dimensions and weight are particularly important. The approximate 2,450 mm height, 1,200 mm width, 800 mm depth, and 1,500–2,300 kg weight class should be considered during preliminary planning, while the final mechanical drawing and shipping data should be used for actual transportation, lifting, foundation, and installation calculations.