Company Information
E-mail		[email protected]
Mobile		+8615980777398
Whatsapp		+8615980777398
WeChat		15980777398

Allen-Bradley 20G11LF795JN2NNNNN PowerFlex 755 AC Drive — Complete Product Description, Technical Specifications, Applications, Advantages and Related Models

The 20G11LF795JN2NNNNN is a high-power Allen-Bradley PowerFlex 755 AC Drive designed for large industrial motor-control applications. It belongs to the PowerFlex 750-Series and is configured for a 690 VAC three-phase power system, with a rated current of 795 A.

This model is intended for applications where large motors need controlled starting, stopping, speed regulation, torque control and integration into an industrial automation system.

The following information is organized for technical reference, product catalog preparation, engineering selection and industrial procurement. Exact mechanical dimensions and shipping weight can vary with the complete configured package, so those items are clearly identified where necessary.

---

1. Product Basic Information

---

2. Product Introduction

The 20G11LF795JN2NNNNN is a high-capacity variable-frequency AC drive in the PowerFlex 755 family.

It is designed for large three-phase motors where a conventional motor starter would not provide sufficient speed control or where the process requires controlled acceleration, controlled deceleration and adjustable motor speed.

With a 690 VAC input voltage and 795 A rated current, this drive is positioned at the high-power end of industrial variable-frequency drive applications.

The product is especially suitable for large pumps, fans, conveyors, compressors, blowers, material-handling equipment and other process machinery.

The PowerFlex 755 architecture combines high-power motor control with industrial communication and drive diagnostics, allowing the drive to become part of a larger automation system instead of operating as an isolated motor controller.

---

3. Product Series and Brand

The PowerFlex 755 is designed for applications where the drive needs to provide more than simple frequency adjustment.

It is intended for applications requiring advanced motor control, networking, diagnostics, programmable functions and integration with industrial control systems.

---

4. Model Number: 20G11LF795JN2NNNNN

The catalog number is made up of several configuration sections.

For this reason, the complete model number should be retained when purchasing, replacing or specifying the equipment.

The important characteristics represented by this configuration include:

• PowerFlex 755 architecture
• Air-cooled construction
• 690 VAC class
• 795 A current rating
• AC input with precharge
• DC terminals
• Embedded EtherNet/IP
• Type 1 / IP20 construction
• 800 mm mechanical configuration
• Filtered configuration
• CM capacitor jumper installed
• No dynamic braking resistor
• Cabinet-mounted arrangement

The JN2 configuration should not be treated as identical to every other 795 A PowerFlex 755 model.

For example, 20G11LF795JN0NNNNN, 20G11LF795JN2NNNNN and 20G11LF795JN4NNNNN have similar fundamental electrical characteristics but can differ in configuration options.

Therefore, replacing one with another should be done only after checking the complete catalog configuration.

---

5. Detailed Electrical Parameters

---

6. Power Rating

The 795 A rating is one of the most important characteristics of this drive.

The actual motor selection should not be based only on the motor’s kW rating.

A motor application may require additional current because of high starting torque, acceleration requirements, overload conditions or continuously varying mechanical loads.

For this reason, the motor’s rated current, rather than horsepower or kW alone, should be used as one of the primary drive-selection parameters.

---

7. Mechanical Specifications

The 20G11LF795JN2NNNNN is a large-frame industrial drive.

The 800 mm specification should not automatically be interpreted as the complete H × W × D dimension.

For a high-power packaged drive, mechanical drawings should be used for final cabinet layout, transportation, lifting and installation calculations.

---

8. Weight Information

The listed weight for the 20G11LF795JN2NNNNN is approximately:

79.38 kg

This value should be understood as the listed drive/configuration weight rather than automatically assuming that it represents the weight of an entire assembled MCC cabinet, shipping package or complete installation.

For transportation and lifting work, the actual nameplate/configuration data should be used.

This distinction is important because high-power industrial drive packages can include additional cabinets, mounting structures, disconnect equipment, bus systems and other components that increase the total system weight.

---

9. Cooling System

The drive uses an air-cooled design.

Air cooling is a practical solution for large industrial variable-frequency drives because it avoids the additional complexity of liquid cooling.

However, air-cooled operation requires careful attention to:

• Airflow
• Ambient temperature
• Cabinet ventilation
• Intake air quality
• Exhaust air routing
• Cooling-fan operation
• Service clearance

For a drive operating at this power level, the heat generated by the drive should be included in the thermal calculation of the electrical room or cabinet.

---

10. Enclosure and Protection

The drive uses a Type 1 / IP20 configuration.

This means it is intended primarily for installation in an appropriate industrial electrical environment rather than direct exposure to rain, water spray, dust-heavy outdoor environments or aggressive chemicals.

The drive should normally be installed in a properly designed electrical room, MCC section or suitable industrial cabinet.

The enclosure specification is particularly important when the drive is used in:

• Mining
• Cement plants
• Steel plants
• Chemical plants
• Water-treatment facilities
• Manufacturing plants
• Power-generation facilities
• Material-processing plants

The environmental requirements of the final installation should always be checked against the actual enclosure and site conditions.

---

11. Communication Capability

The 20G11LF795JN2NNNNN includes embedded EtherNet/IP functionality.

This is an important advantage in modern industrial automation.

The drive can be incorporated into a networked control system where the automation controller communicates with the drive to exchange information such as:

• Start commands
• Stop commands
• Speed reference
• Direction command
• Drive status
• Current
• Speed
• Fault information
• Alarm information
• Diagnostic information
• Operating parameters

This makes the drive suitable for centralized plant control.

---

12. Industrial Automation Integration

The PowerFlex 755 architecture is well suited to PLC-based automation.

A typical system may contain:

PLC → Industrial Ethernet Network → PowerFlex 755 → Motor

The PLC can issue commands to the drive, while the drive can return status and diagnostic information.

This approach can reduce the amount of conventional hardwired control required for large motor systems.

It also makes it easier for operators to monitor the condition of multiple motors from a central HMI or supervisory system.

---

13. Main Applications

13.1 Large Water Pumps

One of the strongest application areas for this drive is large pump equipment.

Typical applications include:

• Water supply
• Wastewater treatment
• Cooling-water systems
• Industrial circulation
• Process water
• Mine dewatering
• Large irrigation systems
• Utility water systems

Variable-speed control allows the pump motor to operate according to process demand.

This can provide more flexibility than running the motor continuously at a fixed speed.

---

13.2 Large Industrial Fans

Large fans frequently benefit from variable-frequency control.

Typical applications include:

• Furnace ventilation
• Industrial exhaust
• Mine ventilation
• Cooling systems
• Process ventilation
• Large air-handling systems
• Combustion-air systems

The drive can adjust motor speed according to the required airflow.

---

13.3 Heavy-Duty Conveyors

Large conveyors can place considerable mechanical stress on motors and gearboxes during starting.

The PowerFlex 755 can provide controlled acceleration and deceleration.

Typical applications include:

• Mining conveyors
• Ore conveyors
• Cement conveyors
• Aggregate handling
• Port material handling
• Bulk-material transport
• Industrial production conveyors

---

13.4 Large Blowers

Industrial blowers often require continuous variable-speed operation.

Applications can include:

• Process-air systems
• Furnace systems
• Industrial ventilation
• Dust collection
• Combustion systems
• Material-processing systems

---

13.5 Compressors

Large compressor motors can require substantial starting and operating current.

A properly selected PowerFlex 755 can provide controlled motor operation for applications where variable-speed compressor control is required.

---

13.6 Mining Equipment

The large current capacity makes this product suitable for large mining-related machinery.

Potential applications include:

• Conveyors
• Dewatering pumps
• Ventilation fans
• Processing equipment
• Material handling
• Crushing-related auxiliary equipment

Heavy-duty application requirements should be evaluated carefully because a crusher or similar machine can impose substantially higher torque requirements than a centrifugal pump.

---

13.7 Cement and Aggregate Equipment

The drive can also be considered for:

• Raw-material conveyors
• Large fans
• Process pumps
• Material handling
• Industrial blowers
• Auxiliary process equipment

The high-power rating makes it particularly useful where motors are rated in the hundreds of kilowatts.

---

14. Product Advantages

14.1 Very High Current Capacity

The 795 A output rating is the primary advantage of the product.

It provides sufficient capacity for very large industrial motors and is suitable for applications where smaller PowerFlex drives cannot provide the required current.

---

14.2 690 VAC High-Power Architecture

The 690 VAC class is well suited to large motor systems.

At a given power level, a higher motor voltage allows the motor current to remain lower than would be required at a lower voltage.

This can be advantageous for large industrial electrical systems.

---

14.3 PowerFlex 755 Platform

The PowerFlex 755 platform provides considerably more functionality than a basic variable-speed drive.

It is designed for industrial environments where motor control, networking, diagnostics and system integration are all important.

---

14.4 EtherNet/IP Integration

Embedded EtherNet/IP makes the drive convenient for networked industrial automation.

This is particularly valuable in facilities where drives are integrated with PLCs and centralized control systems.

---

14.5 Controlled Motor Acceleration

Large motors can generate significant mechanical shock during direct starting.

Variable-frequency operation can provide smoother acceleration.

This can help reduce mechanical stress on:

• Motor shafts
• Gearboxes
• Couplings
• Conveyor belts
• Pumps
• Fans
• Mechanical transmission systems

---

14.6 Controlled Deceleration

The drive can also control the motor during stopping.

This can be useful where an uncontrolled stop could cause process problems or mechanical shock.

However, because this particular configuration has no dynamic braking resistor, applications requiring rapid regenerative braking should be evaluated separately.

---

14.7 Industrial Diagnostics

Drive diagnostics can help maintenance personnel identify problems.

This can improve troubleshooting efficiency and provide better visibility into drive and motor operation.

---

14.8 Standardization

If a plant already uses PowerFlex 750-Series equipment, selecting a PowerFlex 755 can simplify standardization.

Maintenance personnel can work with a consistent drive architecture, communication approach and control philosophy.

---

15. Important Limitation: Dynamic Braking

The 20G11LF795JN2NNNNN is specified with no dynamic braking.

This is important for applications involving high-inertia loads.

Examples include:

• Large centrifuges
• Rapidly decelerated conveyors
• High-inertia fans
• Certain hoisting systems
• High-speed rotating machinery

If the application requires rapid deceleration, the braking method should be analyzed before selecting the drive.

A drive without an appropriate braking or regenerative solution may not be suitable for an application that repeatedly forces substantial energy back into the DC bus.

---

16. Five Same-Series / Closely Related Models

The following models are useful comparison choices within the PowerFlex 755 high-power family.

The models below should be considered related configurations, not automatic replacements.

Comparison of the Five Related Models

The 20G11LF590JN2NNNNN is a lower-current alternative. It is useful when the motor’s full-load current is substantially below 795 A.

The 20G11LF795JN0NNNNN is very close to the subject model electrically. The main difference is the configuration represented by the catalog suffix.

The 20G11LF795JN4NNNNN is another 795 A configuration. It should be evaluated by comparing the exact option structure rather than assuming it is identical to the JN2 version.

The 20G11LF960JN2NNNNN provides greater current capacity than the 795 A model and is appropriate where the application requires additional drive capacity.

The 20G11LF1K0JN2NNNNN is an even larger high-power configuration and is intended for applications requiring approximately 1 MW-class drive capacity.

---

17. Five Same-Brand Popular / Commonly Used Models

The following models represent other well-known Allen-Bradley PowerFlex products and provide a useful comparison across different power ranges.

They are not direct replacements for the 20G11LF795JN2NNNNN.

---

18. Comparison Between PowerFlex 755 and Smaller PowerFlex Products

The table illustrates why model selection should be based on motor current and application requirements rather than brand or series name alone.

---

19. Application Matching Table

---

20. Installation Requirements

Electrical Installation

The incoming electrical system should be designed for a 690 VAC, three-phase drive.

The upstream switchgear, circuit protection, cabling, grounding and short-circuit protection should all be selected according to the actual installation.

---

Motor Selection

The motor’s following parameters should be checked:

• Rated voltage
• Rated current
• Rated frequency
• Rated speed
• Rated power
• Power factor
• Efficiency
• Starting torque
• Maximum speed
• Insulation system
• Cable length
• Duty cycle

The drive should not be selected solely from the motor nameplate kW value.

---

Ventilation

Adequate ventilation is essential.

The drive generates heat during normal operation, and this heat must be removed from the cabinet or electrical room.

Air intake and exhaust paths should be kept clear.

---

Cable Installation

Motor cables should be selected based on:

• Rated current
• Cable length
• Installation temperature
• Cable grouping
• Voltage rating
• EMC requirements
• Grounding requirements

Long motor cables may require additional consideration because of reflected-wave effects and electrical noise.

---

21. Environmental Considerations

The IP20 / Type 1 configuration is not intended to be treated as a fully sealed outdoor enclosure.

For harsh environments, the drive may require installation inside a properly designed cabinet or electrical room.

---

22. Communication and Control Advantages

The integrated network capability can make the PowerFlex 755 particularly attractive for large plants.

A centralized control system can monitor multiple drives and collect:

• Drive status
• Running condition
• Motor speed
• Current
• Fault codes
• Alarm information
• Operating parameters
• Control references

This can reduce the need for separate instrumentation in some applications.

It also allows maintenance personnel to obtain more information without physically standing beside the drive.

---

23. Maintenance Advantages

A large industrial drive should be selected not only according to its electrical rating but also according to the long-term maintenance requirements.

The PowerFlex 755 architecture provides a structured drive platform that can simplify maintenance where a facility already operates other PowerFlex equipment.

Common maintenance activities include:

• Inspection of cooling airflow
• Fan inspection
• Cleaning of ventilation paths
• Inspection of electrical connections
• Inspection for overheating
• Checking alarms and faults
• Checking motor connections
• Checking grounding
• Monitoring operating temperature
• Checking communication status

---

24. Why the 20G11LF795JN2NNNNN Is Suitable for Large Industrial Applications

The product combines several characteristics that are valuable in heavy industrial applications.

First, the 795 A current rating gives it enough capacity for large motors.

Second, the 690 VAC voltage class makes it suitable for high-power motor systems.

Third, the PowerFlex 755 platform provides advanced industrial drive functionality.

Fourth, the embedded EtherNet/IP capability makes it suitable for networked automation.

Fifth, the air-cooled cabinet-style design is appropriate for large industrial electrical installations.

Taken together, these features make it much more suitable for large process machinery than a compact general-purpose inverter.

---

25. Important Selection Differences Between Related 795 A Models

The most important point is that the same current rating does not mean the same complete configuration.

The JN2, JN0, JN4 and other suffix configurations should be compared option by option before substitution.

---

26. Product Advantages Summary

---

27. Technical Specification Summary

---

28. Recommended Related Models — Quick Selection

---

29. Recommended Allen-Bradley Models — Broader Range

---

30. Final Product Assessment

The 20G11LF795JN2NNNNN is a large-capacity Allen-Bradley PowerFlex 755 AC drive intended for demanding industrial motor-control applications.

Its most important specifications are the 690 VAC three-phase input, 795 A current rating, approximately 800 kW normal-duty capacity, air-cooled construction, Type 1/IP20 enclosure, 800 mm mechanical class and embedded EtherNet/IP communication.

The drive is particularly well suited to large pumps, fans, conveyors, blowers, compressors, mining equipment and other process machinery requiring controlled motor speed and high power.

Its biggest strengths are high current capacity, high-power operation, industrial networking, flexible motor control and compatibility with large automated production systems.

The main factors that need additional attention are the physical size, heat dissipation, electrical protection, motor-cable requirements and the absence of dynamic braking in this configuration.

For replacement work, the 20G11LF795JN0NNNNN, 20G11LF795JN4NNNNN, 20G11LF795AN2NNNNN and other 795 A configurations should not be treated as interchangeable solely because their current ratings are identical. The complete catalog configuration must be checked.

For a new installation, the most important parameters to verify are motor rated current, motor voltage, duty classification, overload requirement, acceleration/deceleration profile, braking requirements, communication architecture, cabinet dimensions, ventilation and actual installed weight.

Overall, the 20G11LF795JN2NNNNN is best regarded as a high-power industrial drive for large 690 V motors, rather than a general-purpose inverter. Its strongest application value appears where high motor power, controlled speed, networked automation and reliable industrial operation are required.