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

1. Product Identification

The 20G11LF960JN2NNNNN is a high-power AC variable-frequency drive belonging to the PowerFlex 755 series.

It is designed for large three-phase industrial motors and is particularly suitable for applications where high motor current, variable-speed operation, controlled acceleration, process automation and reliable industrial communication are required.

The model is a 690 VAC, 960 A, air-cooled AC packaged drive with an 800 mm deep MCC-style mechanical arrangement.

Because of its high current and power capability, this product is intended for large industrial equipment rather than small or medium-sized machinery.

---

2. Brand and Product Series

Brand

Allen-Bradley

Product Family

PowerFlex

Product Series

PowerFlex 755

Product Platform

PowerFlex 750-Series

The PowerFlex 755 series is positioned for demanding industrial motor-control applications.

Compared with compact variable-frequency drives, the PowerFlex 755 platform provides a much broader range of power ratings, control functions, communication capabilities and installation configurations.

The 20G11LF960JN2NNNNN represents one of the high-current configurations within this product family.

It is intended for large motors used in industrial production, process equipment, water systems, mining equipment, material handling and other heavy-duty applications.

---

3. Basic Product Parameters

---

4. Product Introduction

The 20G11LF960JN2NNNNN is a high-power variable-frequency drive intended to regulate the operation of large AC motors.

Instead of supplying a motor with fixed-frequency electrical power at all times, the drive controls the electrical output supplied to the motor.

This allows the motor speed to be adjusted according to the requirements of the machine or production process.

A simplified system can be represented as:

Three-Phase Power Supply → PowerFlex 755 → AC Motor → Mechanical Equipment

The mechanical equipment may be a pump, fan, blower, conveyor, compressor or other large rotating machine.

In an automated production environment, the drive can also operate as part of a larger control system:

PLC → Industrial Network → PowerFlex 755 → Motor

The controller can provide speed references and operating commands, while the drive can provide status, operating information and fault information.

This arrangement allows the motor to become an integrated part of the automation system rather than operating as an independent electrical device.

---

5. High-Power Electrical Design

The most significant characteristic of this model is its 960 A output-current rating.

A 960 A drive is designed for very large industrial motors.

The drive operates in the 690 VAC class, which is commonly associated with high-power industrial motor systems.

The combination of voltage and current allows the drive to serve applications with very large motor power requirements.

The duty rating is an important consideration.

A pump or fan generally has different operating characteristics from a conveyor, crusher or other constant-torque machine.

For that reason, final drive selection should be based on the actual motor current and load characteristics.

---

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

The product is associated with approximately the following power classes:

These ratings should not be interpreted as three separate output modes that can automatically be selected without considering the application.

The actual permissible motor loading depends on the operating duty, overload requirement, motor characteristics, ambient conditions and installation conditions.

For a variable-torque load such as a centrifugal pump or fan, the light-duty rating may be particularly relevant.

For applications requiring higher overload capability or constant torque, the lower heavy-duty rating should be considered.

---

7. Main Applications

7.1 Large Pump Systems

Large pumps are one of the most suitable application categories for this type of high-power drive.

Possible applications include:

• Water transfer systems
• Industrial water circulation
• Cooling-water systems
• Wastewater systems
• Mine dewatering
• Process-water pumps
• Utility pumping
• Irrigation
• Large-scale fluid handling

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

For example, a water system may require high flow during peak production and substantially lower flow during periods of reduced demand.

A variable-speed drive can adjust motor speed instead of requiring the motor to operate continuously at full speed.

---

8. Large Fan Applications

Large industrial fans can require motors with very high power ratings.

The PowerFlex 755 platform can be applied to large fan systems where variable-speed control is required.

Typical applications include:

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

Fan speed can be adjusted according to the actual airflow or pressure requirement.

This can provide better process control and may reduce energy consumption when the system frequently operates below maximum capacity.

---

9. Conveyor Applications

Large conveyors are another important application.

A heavily loaded conveyor can have substantial mechanical inertia.

Starting such equipment directly can produce significant mechanical and electrical stress.

A variable-frequency drive allows the motor to accelerate in a controlled manner.

Potential applications include:

• Mining conveyors
• Ore conveyors
• Coal conveyors
• Aggregate conveyors
• Bulk-material conveyors
• Port conveyors
• Long-distance belt conveyors
• Material-transfer systems

Controlled acceleration can help reduce sudden mechanical loading on belts, gearboxes, couplings and shafts.

---

10. Blower Applications

Large blowers can also benefit from variable-speed motor control.

Possible applications include:

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

The motor speed can be adjusted according to process requirements.

This allows the blower to deliver airflow closer to the actual demand instead of continuously operating at maximum speed.

---

11. Compressor Applications

Large compressors may also use high-power variable-frequency drives.

The suitability of this drive depends on the compressor design and its operating requirements.

Important factors include:

• Compressor type
• Motor current
• Starting torque
• Acceleration time
• Operating speed range
• Mechanical inertia
• Process pressure
• Required stopping behavior

The drive should therefore be selected based on the complete compressor system rather than motor horsepower alone.

---

12. Heavy Industrial Machinery

The drive can also be used for large industrial rotating machinery.

Possible applications include:

• Large mixers
• Mills
• Process machines
• Material-processing equipment
• Heavy rotating machinery
• Production machinery
• Industrial auxiliary systems
• Bulk-material equipment

The main advantage is the ability to regulate motor operation instead of using simple fixed-speed switching.

---

13. Main Product Advantages

13.1 960 A High-Current Capability

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

It allows the drive to control very large motors that would be beyond the practical range of smaller industrial drives.

This makes it suitable for large pumps, fans, conveyors and process equipment.

---

13.2 690 VAC Voltage Class

The 690 VAC class is suitable for high-power industrial motor systems.

At high power levels, operating at a higher motor voltage can help keep current within a manageable range.

This is particularly useful for large industrial installations.

---

13.3 Megawatt-Class Power

With an approximate 1,000 kW light-duty rating, the drive belongs to the megawatt-class category.

This provides a substantial capacity range for large industrial machines.

---

13.4 Variable-Speed Operation

The motor can operate at different speeds according to the process requirement.

This can provide:

• Better process control
• Flexible production rates
• Controlled flow
• Controlled pressure
• Controlled airflow
• Controlled conveyor speed

---

13.5 Controlled Acceleration

Large motors and machines can have considerable inertia.

Controlled acceleration allows the machine to reach operating speed progressively.

This can reduce mechanical shock and improve the starting behavior of the equipment.

---

13.6 Controlled Deceleration

The drive can provide controlled stopping profiles.

This can be useful when the machine needs a controlled stop instead of an abrupt stop.

However, high-inertia applications should be evaluated carefully because deceleration can return energy to the drive system.

---

13.7 Industrial Communication

The drive includes embedded EtherNet/IP capability.

This allows it to be integrated into an industrial control network.

Typical information exchanged with a controller can include:

• Start command
• Stop command
• Speed reference
• Direction
• Drive status
• Running status
• Fault status
• Alarm status
• Speed feedback
• Current information

---

14. Filtering and CM Configuration

The 20G11LF960JN2NNNNN is configured with filtering and a CM jumper installed.

This configuration should be considered together with the complete electrical installation.

Relevant factors include:

• Grounding
• Motor cable length
• Motor insulation
• Cable construction
• Electrical-system topology
• EMC requirements
• Leakage current
• Common-mode behavior

The drive configuration should therefore be considered as part of the complete motor-drive system.

---

15. Dynamic Braking

This model is configured with no dynamic braking.

This is an important consideration for high-inertia applications.

When a large motor decelerates, energy from the rotating equipment can flow back toward the drive’s DC bus.

Applications requiring rapid stopping should therefore be evaluated carefully.

Potential high-inertia applications include:

• Large conveyors
• Large fans
• Centrifugal machinery
• Large blowers
• Heavy rotating equipment

If rapid deceleration is required, the braking and regenerative-energy requirements should be evaluated during system design.

---

16. Operator Interface

The model is configured for a door-mounted HIM arrangement.

This provides a practical way to interact with the drive at the cabinet level.

Depending on the system configuration, an operator or maintenance technician may use the interface for functions such as:

• Viewing drive status
• Monitoring operating parameters
• Checking faults
• Resetting faults
• Adjusting selected parameters
• Performing commissioning activities

For a large industrial system, local operation can be combined with PLC and network-based control.

---

17. Mechanical Construction

The drive uses an 800 mm deep MCC-style configuration.

This is a large industrial mechanical arrangement.

It is substantially different from a compact wall-mounted VFD.

---

18. Dimensions

The model is identified with an 800 mm mechanical depth class.

It is important not to interpret this as a complete equipment size of exactly 800 × 800 × 800 mm.

The overall height and width depend on the complete physical configuration.

For a real installation, the final dimensional drawing should be used for cabinet design and floor planning.

---

19. Weight

The final equipment weight depends on the complete packaged configuration.

Because this is a large MCC-style high-power drive, it is not appropriate to assign an exact kilogram value without the corresponding mechanical configuration.

For transportation, lifting and foundation calculations, the final configured equipment documentation should be used.

---

20. Cooling Requirements

The drive uses air cooling.

At this power level, thermal management becomes an important part of system design.

The electrical room or cabinet must provide adequate airflow.

The cooling design should consider:

• Air intake
• Hot-air exhaust
• Room temperature
• Cabinet ventilation
• Dust accumulation
• Fan operation
• Maintenance
• Heat dissipation

If hot air is allowed to circulate back into the drive intake, the operating temperature can increase.

For this reason, cabinet airflow should be considered during the initial mechanical design.

---

21. Environmental Requirements

The IP20 / Type 1 construction should not be considered a sealed outdoor enclosure.

For outdoor, wet, dusty or chemically aggressive environments, additional protection may be necessary.

---

22. Installation Considerations

A 960 A drive requires careful electrical and mechanical planning.

The installation should take into account:

• Incoming power cables
• Motor cables
• Grounding
• Short-circuit protection
• Cable bending radius
• Cabinet ventilation
• Control wiring
• Network wiring
• Maintenance access
• Lifting
• Floor loading
• Heat dissipation

The nominal mechanical dimensions should not be used as the only installation-space requirement.

Large cables and maintenance access can require substantial additional room.

---

23. Motor Selection

The drive should be matched to the actual motor.

The motor’s actual current should be compared with the applicable drive duty rating.

The drive should not be selected simply because its kW rating appears larger than the motor’s nameplate power.

---

24. Five Same-Series or Closely Related Models

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

These models are useful when comparing current capacity and catalog configurations.

The 20G11LF960JN0NNNNN is particularly close electrically because it shares the same 690 VAC and 960 A class.

The 20G11LF960JN4NNNNN is another closely related 960 A configuration.

The lower-current models can be considered where the actual motor current does not require the full 960 A capacity.

---

25. Related Model Comparison

---

26. Five Popular Models from the Same Brand

The following models represent different size ranges within the broader Allen-Bradley variable-frequency-drive portfolio.

These products should not be regarded as direct substitutes.

The PowerFlex 525 models are intended for much smaller motor systems.

The PowerFlex 753 occupies a higher power category.

The PowerFlex 755 960 A models are intended for substantially larger motors and industrial equipment.

---

27. Product Selection by Application

---

28. Application Advantages for Pumps

For large pumps, variable-speed control can provide a more flexible operating point.

The pump does not necessarily need to operate at maximum speed all the time.

The drive can adjust speed according to:

• Flow demand
• Pressure demand
• Production requirements
• Water consumption
• Process conditions

Potential benefits include:

• Improved flow control
• Reduced throttling
• Smoother starting
• Reduced mechanical stress
• Potential energy savings
• Better process stability

The actual energy-saving level depends on the hydraulic system and operating profile.

---

29. Application Advantages for Fans

For fans, the drive can change airflow by changing motor speed.

This can be advantageous where the required airflow changes throughout the day or production cycle.

Potential benefits include:

• Adjustable airflow
• Better pressure control
• Smoother operation
• Reduced mechanical stress
• Improved automation
• Potential energy reduction

This makes the drive particularly useful for large ventilation and process-air systems.

---

30. Application Advantages for Conveyors

For large conveyors, controlled acceleration can be particularly valuable.

A loaded conveyor can have significant mechanical inertia.

The drive can accelerate the motor gradually rather than applying a sudden mechanical impulse.

Potential benefits include:

• Smoother starting
• Reduced belt stress
• Reduced gearbox shock
• Reduced coupling stress
• Better control of loaded starts
• Better synchronization with production equipment

---

31. Application Advantages for Mining

Mining applications often require high-power motors and continuous operation.

Typical requirements include:

• High starting torque
• Large motor current
• High mechanical inertia
• Long acceleration time
• Continuous operation
• Variable production demand

The 960 A capability makes the model suitable for consideration in large mining applications.

The actual installation must also consider dust, vibration, temperature and environmental conditions.

---

32. Application Advantages for Process Industries

Process equipment often needs motor speed to follow a process variable.

Examples include:

• Flow
• Pressure
• Airflow
• Production rate
• Material level
• Temperature-related process demand

The drive can receive a reference from the automation system and regulate motor speed accordingly.

This allows the motor to become part of the process-control loop.

---

33. Industrial Communication

The embedded EtherNet/IP capability allows the drive to participate in an industrial network.

A typical control architecture can be structured as:

Controller → Network → Drive → Motor

The drive can exchange information such as:

This architecture is particularly useful for large automated production systems.

---

34. Diagnostics

A high-power drive should provide sufficient diagnostic information to support maintenance.

Typical diagnostic categories include:

• Drive faults
• Overcurrent conditions
• Overvoltage
• Undervoltage
• Thermal conditions
• Communication problems
• Motor-related conditions
• DC-bus conditions
• Cooling-system conditions

Diagnostic information can reduce troubleshooting time.

Instead of simply identifying that a motor has stopped, maintenance personnel can investigate the specific drive condition that caused the shutdown.

---

35. Maintenance Recommendations

Large industrial drives should be included in a preventive-maintenance program.

Typical maintenance tasks include:

The maintenance interval should be adapted to the actual environment.

A dusty industrial environment generally requires more frequent inspection than a clean electrical room.

---

36. Important Selection Considerations

Before purchasing or replacing this drive, the following items should be checked.

A similar-looking catalog number should not automatically be considered a replacement.

For high-power drives, small configuration differences can affect the electrical installation.

---

37. Why the Complete Model Number Matters

The complete model number is:

20G11LF960JN2NNNNN

The individual characters identify different aspects of the product configuration.

This is why the following models should not automatically be treated as identical:

20G11LF960JN0NNNNN

20G11LF960JN2NNNNN

20G11LF960JN4NNNNN

They may share the same voltage and current class while having different configuration options.

For purchasing, maintenance and replacement, the complete catalog number should always be checked.

---

38. Overall Product Advantages

---

39. Complete Technical Summary

---

40. Final Assessment

The 20G11LF960JN2NNNNN is a high-power PowerFlex 755 AC packaged drive designed for large industrial motor applications.

Its combination of 690 VAC operation and 960 A rated current places it in a very high-power category.

The approximate 1,000 kW light-duty, 900 kW normal-duty and 800 kW heavy-duty ratings make it appropriate for large motors used in demanding industrial equipment.

The product is especially suitable for large pumps, fans, blowers, conveyors and other rotating machinery where variable-speed operation is required.

One of its most important practical advantages is the ability to integrate motor control with an industrial automation system.

Instead of simply turning a large motor on and off, the drive can receive speed commands and process references while providing operating status and diagnostic information.

This makes it useful in modern automated production environments.

The 960 A capacity is also valuable for large motors where smaller drive platforms cannot provide sufficient current.

The 690 VAC voltage class makes the product appropriate for high-power motor systems, while the air-cooled construction is suitable for properly designed industrial electrical rooms and cabinets.

The 800 mm mechanical size means that installation planning must be taken seriously.

Adequate room should be allowed for power cables, ventilation, service access and maintenance.

The exact overall dimensions and Weight (kg) should be confirmed against the final physical configuration before transportation, lifting or cabinet construction.

The product is also configured with no dynamic braking, so high-inertia applications requiring rapid stopping need additional engineering consideration.

For pump and fan applications, variable-speed operation can provide improved process control and potentially lower energy consumption when the load profile permits speed reduction.

For conveyors and other high-inertia machinery, controlled acceleration can help reduce mechanical shock.

For process machinery, network integration allows the drive to participate in a larger automatic control strategy.

The closest alternatives are other high-current PowerFlex 755 configurations, particularly the 765 A, 795 A, 825 A and other 960 A models.

The most important point when selecting a replacement is to compare the complete catalog number, not just the voltage, current or power rating.

Overall, the 20G11LF960JN2NNNNN is best characterized as a large, high-current, 690 VAC industrial variable-frequency drive for megawatt-class motor applications, with particular value in large pumps, fans, blowers, conveyors and process machinery.