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PowerFlex 755 AC Drive — 20G11JF960JN4NNNNN

1. Product Overview

The 20G11JF960JN4NNNNN is a high-power variable frequency AC drive belonging to the PowerFlex 755 series.

It is designed for large three-phase industrial motors and is intended for applications where precise speed regulation, controlled acceleration, process control and reliable operation of high-power equipment are required.

The unit is configured for a 690 VAC, three-phase electrical system and has a rated output current of 960 A.

Its published power ratings are approximately 1,000 kW for Light Duty, 900 kW for Normal Duty and 800 kW for Heavy Duty.

This places the model in the very-high-power category. It is substantially larger than the drives normally used for small machinery, and it is intended for large pumps, fans, conveyors, material-handling equipment, process machinery and other heavy industrial installations.

2. Brand and Series

The PowerFlex 755 family is intended for demanding industrial motor-control applications where a broad range of control functions and communication capabilities are required.

3. Basic Technical Parameters

4. Product Introduction

The 20G11JF960JN4NNNNN is a large industrial AC drive designed to control the speed and torque of high-power three-phase motors.

Instead of operating a motor at only one fixed speed, the drive allows the motor speed to be adjusted according to the requirements of the machine or production process.

This is particularly valuable in applications where the motor does not need to operate continuously at full speed.

For example, a large centrifugal pump can reduce its speed when less flow is required. A large ventilation fan can slow down when the required airflow decreases. A conveyor can accelerate gradually instead of applying full mechanical stress immediately.

The drive therefore acts as the electrical interface between the industrial power system and the motor, providing controlled motor operation while also supplying monitoring, protection, communication and process-control functions.

5. High-Power Electrical Characteristics

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

A current rating of this magnitude indicates that the drive is intended for very large industrial motors.

The 690 VAC voltage class is also important.

At high motor power levels, using a higher voltage allows the required power to be transmitted at a lower current than would be required at a lower voltage.

This makes a 690 VAC architecture particularly suitable for large industrial installations.

6. Duty Ratings

The model provides three important power classifications.

The duty rating should always be selected according to the actual application rather than simply comparing the motor’s kW value with the highest number shown in the table.

A motor application with relatively moderate torque requirements may be evaluated using the Light Duty or Normal Duty rating.

A high-torque, high-overload or demanding acceleration application may require the Heavy Duty rating.

Motor full-load current, overload requirements, acceleration time, load inertia and operating profile should all be considered during final selection.

7. Light Duty Application

The approximately 1,000 kW Light Duty rating provides the highest power capability of the three listed classifications.

Light Duty applications generally involve lower overload requirements and often include variable-torque equipment.

Typical examples include:

• Large centrifugal pumps
• Large centrifugal fans
• Cooling-water systems
• Ventilation systems
• Air-handling systems
• Water-transfer equipment

8. Normal Duty Application

The approximately 900 kW Normal Duty rating represents a substantial continuous industrial power capability.

This rating is useful for applications that require a high level of motor performance without the more severe overload conditions associated with Heavy Duty operation.

Typical applications include:

• Large pumps
• Industrial fans
• Conveyors with moderate loading
• Process machinery
• Large material-handling systems
• Utility equipment

9. Heavy Duty Application

The approximately 800 kW Heavy Duty rating is intended for applications with more demanding torque or overload requirements.

Heavy Duty selection should be considered when the machine experiences:

• High starting torque
• Frequent acceleration
• High mechanical inertia
• Significant load variation
• High continuous torque
• Frequent speed changes

10. Enclosure and Mechanical Construction

The drive is configured as an IP54 / Type 12, 800 mm deep MCC-style package.

This is a large floor-mounted industrial construction rather than a compact drive intended to be installed inside a small machine panel.

The mechanical arrangement provides a substantial enclosure for the high-power electrical equipment, cooling system, control equipment and associated components.

11. Dimensions

The model is identified as an 800 mm deep MCC-style configuration.

The 800 mm dimension should be understood as the mechanical depth class rather than assuming that the complete enclosure has a universal width and height for every installation.

For engineering purposes, the exact overall width and height should be taken from the final mechanical arrangement.

Because this is a very large drive, the installation area should allow sufficient space not only for the cabinet itself but also for cable entry, ventilation, maintenance and equipment handling.

12. Weight

The reference weight for this configuration can be treated as approximately 1,246 kg for planning purposes.

This is a substantial piece of electrical equipment.

The actual delivered weight can vary depending on the final configuration, packaging and accessories.

Therefore, when arranging transportation or lifting equipment, the final equipment documentation should be used to confirm the actual shipping weight.

13. Cooling System

The drive uses forced-air cooling.

High-power semiconductor equipment generates significant heat during operation, so the cooling system is an essential part of the drive.

The associated cooling system uses a backward-curved centrifugal fan.

The approximate airflow is 1,805 m³/h, with approximately 0.45 kW fan input power.

14. Importance of Cooling

For a drive of this power level, cooling should be considered during the initial electrical-room design.

The room should have adequate ventilation and sufficient capacity to remove the heat generated by the drive.

Air passages should remain unobstructed.

Dust accumulation should be controlled because industrial dust can gradually reduce cooling performance.

The cooling fan should also be inspected for abnormal noise, vibration or reduced airflow.

15. Input Configuration

The model uses an AC input with precharge and DC terminals.

Precharge is important because the DC bus of a large variable-frequency drive contains significant capacitance.

When the equipment is energized, the precharge circuit helps control the initial charging current.

The drive also provides DC terminals, giving the system additional flexibility for applications requiring DC-bus connections or associated equipment.

16. Filtering and CM Jumper

The configuration is specified as filtered, with the CM jumper installed.

Filtering can be important in installations where electromagnetic compatibility is an engineering concern.

The actual system design still depends on:

• Motor cable length
• Cable type
• Grounding
• Shielding
• Motor construction
• Electrical distribution
• Installation environment
• Local electrical requirements

17. Embedded EtherNet/IP

One of the useful features of the PowerFlex 755 platform is embedded EtherNet/IP communication.

This allows the drive to become part of a larger industrial automation system.

A typical arrangement can be represented as:

Industrial Controller

↓

EtherNet/IP Network

↓

PowerFlex 755 Drive

↓

Large Motor

↓

Pump / Fan / Conveyor / Process Machine

The control system can exchange operating commands, speed references, status information, diagnostic information and other drive data.

18. Operator Interface

The JN4 configuration includes an Enhanced LCD Full-Numeric HIM.

The operator interface is mounted on the door and is specified with IP66 / NEMA Type 4X/12 protection.

This is particularly useful for large packaged drives because the operator does not need to access the interior of the cabinet simply to view drive information or interact with the local interface.

Typical information that can be viewed or managed through the interface includes:

• Drive status
• Output frequency
• Output current
• Motor speed
• Fault information
• Warning information
• Parameter values
• Operating commands
• Diagnostic information

19. Operator Interface Advantages

The door-mounted interface is particularly convenient during commissioning and maintenance.

A technician can inspect drive status without opening the main enclosure.

This can make troubleshooting more efficient.

It also provides a practical local control point when the drive is operating as part of a larger automated system.

The protected operator interface is useful for industrial environments where ordinary exposed electronic interfaces would not be appropriate.

20. Dynamic Braking

The standard configuration does not include dynamic braking.

This is important when the application has a large rotating mass and requires rapid deceleration.

When a large motor decelerates, mechanical energy can be returned to the drive’s DC bus.

If the process requires very rapid stopping, the application engineer must determine how that energy will be handled.

Possible solutions may include:

• External braking equipment
• Regenerative equipment
• Longer deceleration time
• Mechanical braking
• Application-specific energy-management systems

21. Main Applications

21.1 Large Pump Systems

Large pump systems are among the most suitable applications for this type of drive.

Examples include:

• Water-transfer pumps
• Cooling-water pumps
• Industrial circulation pumps
• Process pumps
• Mine dewatering pumps
• Large utility pumps
• Water-treatment pumps

21.2 Large Fan Systems

Large industrial fans often require variable-speed operation.

Applications can include:

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

21.3 Conveyor Systems

Large conveyors may have substantial inertia.

Controlled acceleration can reduce mechanical shock on the conveyor system.

Potential benefits include reduced stress on:

• Belts
• Couplings
• Gearboxes
• Shafts
• Bearings
• Drive pulleys

21.4 Mining Equipment

The high current capacity makes this class of drive suitable for many large mining applications.

Possible uses include:

• Conveyors
• Ventilation fans
• Dewatering pumps
• Material handling
• Processing systems
• Large auxiliary equipment

21.5 Cement and Aggregate Equipment

Large cement and aggregate plants use many high-power motors.

Potential applications include:

• Process fans
• Conveyors
• Pumps
• Material handling
• Process machinery

21.6 Water and Wastewater Systems

Large water systems often require variable-speed pumps.

The drive can regulate pump speed according to flow or pressure requirements.

This can be useful in:

• Water transfer
• Raw-water pumping
• Cooling-water circulation
• Industrial wastewater
• Large treatment facilities

22. Product Advantages

23. Energy-Saving Potential

Variable-speed control can provide significant energy-saving opportunities, particularly with centrifugal pumps and fans.

A fixed-speed motor may continue operating at full speed even when the process requires substantially less flow or airflow.

A variable-frequency drive can reduce motor speed when process demand falls.

The actual energy savings depend on the machine and process.

Important factors include:

• Operating hours
• Motor efficiency
• Pump or fan characteristics
• System resistance
• Average operating speed
• Load profile
• Process requirements

24. Controlled Acceleration

Large motors can impose significant electrical and mechanical stress during starting.

The drive provides controlled acceleration rather than simply applying full-speed operation immediately.

This can be especially valuable for high-inertia loads.

Examples include:

• Large conveyors
• Large fans
• Large pumps
• Material-handling machinery
• Rotating process equipment

25. Process Control

The drive can also be used as part of a process-control system.

For example, a pump can be controlled according to pressure.

A typical arrangement can be:

Pressure Sensor

↓

Controller / PID Function

↓

Speed Reference

↓

PowerFlex 755

↓

Pump Motor

↓

Process

As pressure changes, the motor speed can be adjusted to maintain the desired process condition.

26. Maintenance Considerations

Because this is a high-power industrial drive, maintenance should be treated as an important part of system reliability.

The cooling system deserves particular attention.

The fan should be checked for:

• Abnormal noise
• Vibration
• Reduced airflow
• Bearing problems
• Contamination

The electrical system should also be inspected for:

• Loose connections
• Abnormal heating
• Damaged wiring
• Grounding issues
• Dust accumulation
• Fault history

27. Maintenance Checklist

28. Five Same-Series / Closely Related Models

The following models are closely related to the target model and belong to the same high-power 690 VAC PowerFlex 755 range.

They are useful for comparing different current capacities.

The 650 A, 710 A, 765 A and 795 A versions are particularly useful when the motor’s actual current requirement is lower than 960 A.

29. Same-Series Comparison

30. 650 A Alternative

The 20G11JF650JN4NNNNN is a lower-current alternative in the same 690 VAC family.

It provides approximately 650 A and is rated around 710 kW Light Duty, 630 kW Normal Duty and 500 kW Heavy Duty.

It is appropriate when the motor current is comfortably below the 960 A requirement.

This can avoid unnecessary oversizing while maintaining the same general high-power drive architecture.

31. 710 A Alternative

The 20G11JF710JN4NNNNN provides approximately 710 A.

Its approximate ratings are:

32. 765 A Alternative

The 20G11JF765JN4NNNNN provides approximately 765 A.

33. 795 A Alternative

The 20G11JF795JN4NNNNN is one of the closest alternatives to the 960 A model.

It is particularly useful when the motor is within the 795 A current range and does not require the additional capacity of the 960 A configuration.

34. Higher-Capacity Same-Series Alternative

Another closely related high-power configuration is the 20G11JF1K0JN4NNNNN.

It provides approximately 1,040 A and belongs to the same 690 VAC PowerFlex 755 high-power group.

35. Five Related Models from the Same Brand

For a broader selection, the following models represent different power levels within the same brand family.

They should not be treated as direct replacements for the 960 A model.

They are better regarded as complementary products for smaller and medium-sized motors.

36. PowerFlex 525 — 25B-D017N114

The 25B-D017N114 is a much smaller drive compared with the target model.

It is suitable for smaller motors and compact industrial machines.

37. PowerFlex 525 — 25B-D024N114

The 25B-D024N114 provides a higher current capacity within the compact PowerFlex 525 family.

38. PowerFlex 525 — 25B-D043N114

The 25B-D043N114 is another lower-power option for applications that do not require a large industrial drive.

39. PowerFlex 753 — 20F11NC043JA0NNNNN

The 20F11NC043JA0NNNNN belongs to the PowerFlex 753 family and is designed for larger industrial machinery than the compact PowerFlex 525.

40. PowerFlex 755 — 20G11JF590JN4NNNNN

The 20G11JF590JN4NNNNN is much closer to the target model because it belongs to the same PowerFlex 755 690 VAC high-power family.

41. Comparison of the Main Alternatives

42. Selecting the Correct Current Rating

The current rating should be one of the first considerations when selecting a drive.

For example, if the motor’s actual full-load current is around 600 A, the 650 A configuration may be sufficient depending on the duty requirement.

If the motor requires approximately 700 A, the 710 A configuration becomes more relevant.

For an approximately 760 A motor, the 765 A configuration may be considered.

For an approximately 790 A application, the 795 A model is a logical comparison.

When the motor requires close to 960 A, the 20G11JF960JN4NNNNN becomes the appropriate high-capacity option among these configurations.

The drive should not be selected by kW alone.

43. Why Current Is More Important Than kW Alone

Motor power depends on voltage, current, power factor and efficiency.

Two motors with similar kW ratings can have different current requirements.

This means that selecting a drive only by comparing motor kW with the drive’s kW rating can result in an incorrect selection.

The motor nameplate should be reviewed for:

• Rated voltage
• Rated current
• Rated frequency
• Rated speed
• Power
• Power factor
• Efficiency
• Overload requirements

44. Application Advantages

For a large pump, the drive can provide adjustable flow without relying entirely on mechanical throttling.

For a large fan, the drive can adjust airflow according to demand.

For a conveyor, the drive can provide controlled acceleration and deceleration.

For process equipment, the drive can integrate speed control with feedback signals.

For large industrial motors, the drive provides a centralized solution for speed control, monitoring and communication.

45. Advantages of the 690 VAC Architecture

The 690 VAC configuration is particularly useful for high-power motor applications.

At the same power level, a higher motor voltage can reduce the current required compared with a lower-voltage motor system.

This can have practical implications for:

• Motor cables
• Switchgear
• Bus systems
• Electrical distribution
• Motor connections
• Overall system design

46. Advantages of the Frame 9 Construction

Frame 9 is designed for high-power applications.

The large frame allows the drive system to accommodate the electrical components and cooling requirements associated with very high current levels.

The resulting package is physically large, but this is expected for equipment in the approximately megawatt-class range.

The 800 mm MCC-style arrangement is therefore more appropriate for an industrial electrical room than for a compact machine-control panel.

47. Advantages of EtherNet/IP Integration

The embedded communication capability can simplify the integration of the drive into an automation system.

A centralized control system can monitor:

• Drive status
• Motor speed
• Output current
• Frequency
• Faults
• Warnings
• Operating references
• Process information

This can reduce the need for separate hardwired signals for every operating parameter.

48. Advantages of the Door-Mounted HIM

The door-mounted operator interface is especially useful on a large cabinet.

A technician can inspect information directly from the front of the enclosure.

This is useful during:

• Startup
• Commissioning
• Maintenance
• Troubleshooting
• Parameter adjustment
• Fault investigation

49. Important Installation Considerations

A drive of this size requires detailed engineering before installation.

50. Environmental Considerations

Although the enclosure provides industrial protection, the installation environment should still be evaluated.

Important factors include:

• Ambient temperature
• Humidity
• Dust
• Corrosive gases
• Conductive contamination
• Altitude
• Ventilation
• Heat accumulation
• Chemical exposure
• Water exposure

51. Recommended Applications

52. Overall Product Advantages

The strongest advantage of the 20G11JF960JN4NNNNN is its ability to control extremely large motors from a single high-power drive platform.

Its combination of 690 VAC operation, 960 A output current, approximately 1,000 kW Light Duty capability, 900 kW Normal Duty capability and 800 kW Heavy Duty capability makes it suitable for applications well beyond the range of ordinary industrial VFDs.

The Frame 9 construction provides the physical platform required for this power level.

The IP54 / Type 12 enclosure is suitable for many indoor industrial electrical installations.

The 800 mm MCC-style construction provides a large engineered cabinet arrangement.

The forced-air cooling system provides the airflow necessary for high-power operation.

The embedded EtherNet/IP capability allows integration with industrial automation systems.

The Enhanced LCD full-numeric HIM provides convenient local operation.

The door-mounted IP66 / NEMA Type 4X/12 HIM is particularly useful for maintenance and commissioning.

53. Final Technical Summary

54. Final Recommendation

For applications requiring a 690 VAC motor drive around the 900 kW Normal Duty range, the 20G11JF960JN4NNNNN is a very high-capacity solution.

If the motor current is lower, the 20G11JF795JN4NNNNN, 20G11JF765JN4NNNNN, 20G11JF710JN4NNNNN or 20G11JF650JN4NNNNN should be considered according to the motor nameplate current and application duty.

If the motor requirement approaches or exceeds the 960 A range, the larger 20G11JF1K0JN4NNNNN configuration can be considered where its electrical and mechanical ratings are appropriate.

For smaller motors, a PowerFlex 525 or PowerFlex 753 solution is generally more practical because the physical size and power capacity of a Frame 9, 690 VAC drive would be unnecessary.

The key specifications of the target model can therefore be summarized as:

690 VAC / 3 Phase / 960 A / 1,000 kW Light Duty / 900 kW Normal Duty / 800 kW Heavy Duty / Frame 9 / IP54 Type 12 / 800 mm MCC Style / Forced Air / Embedded EtherNet/IP / Door-Mounted Enhanced LCD HIM / Approx. 1,246 kg reference weight.

For a large pump, fan, conveyor, mining system, water-transfer system or heavy process machine, these characteristics make the model particularly well suited to high-power variable-speed motor control.