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

Allen-Bradley 20G11JC1K5JN4NNNNN — PowerFlex 755 High-Power AC Drive

1. Product Overview

The 20G11JC1K5JN4NNNNN is a high-power PowerFlex 755 AC Packaged Drive designed for large three-phase industrial motors. It belongs to the PowerFlex 750-Series, with PowerFlex 755 as the specific product series.

This is a large-frame, air-cooled variable frequency drive intended for demanding industrial applications where high motor power, high output current, precise speed control, process integration and industrial communication are required.

The model is configured for a 400 VAC, three-phase electrical system and has a rated current of approximately 1,480 A. Its published ratings are 900 kW light duty, 850 kW normal duty and 710 kW heavy duty. The configuration is Frame 9, uses an air-cooled cabinet arrangement, and is specified as an 800 mm deep MCC-style enclosure with Type 12 / IP54 protection.

The catalog configuration includes embedded EtherNet/IP, filtered input, AC input with precharge, DC terminals, installed CM jumper, no dynamic braking transistor and an enhanced LCD full-numeric HIM mounted on the door. This makes it particularly suitable for large industrial installations where operators need local access to drive information while the drive also participates in a plant-wide automation system.

---

2. Brand and Product Series

The catalog description identifies the product specifically as a PowerFlex 755 AC Drive, with embedded EtherNet/IP, forced-air cooling, 400 VAC three-phase input, 1,480 A current rating, 900 kW light-duty rating, 850 kW normal-duty rating and 710 kW heavy-duty rating.

---

3. Detailed Product Parameters

The 1,246.47 kg value is a listed equipment weight for this exact catalog number. The product information also identifies the cabinet as an 800 mm deep MCC-style configuration.

Because this is a large packaged cabinet rather than a small standalone inverter, the final shipping arrangement can differ from the basic equipment configuration. For transportation, crane selection, floor loading and foundation design, the actual equipment drawing and shipping documentation should be used.

---

4. Duty Ratings

The drive has three important power ratings. This is one of the most important points to understand when selecting the product.

The difference between these ratings is important because a motor application should not be selected simply by looking at the largest kW number.

A centrifugal pump may have a relatively predictable load profile and can often be evaluated around the normal-duty rating.

A conveyor, crusher or high-inertia machine may require substantially more torque during acceleration and may therefore need to be evaluated using the heavy-duty rating.

The model’s published 900 kW LD / 850 kW ND / 710 kW HD ratings are consistent with the catalog configuration.

---

5. Product Introduction

The 20G11JC1K5JN4NNNNN is designed for applications where a very large AC motor needs controlled speed and torque rather than simple start/stop operation.

A conventional motor starter generally provides basic motor switching and protection.

A variable frequency drive provides much more control.

It can regulate the motor’s operating frequency and voltage, allowing the motor to accelerate gradually, operate at different speeds and follow changing production requirements.

For large industrial equipment, this can have a direct effect on mechanical stress, process stability and energy consumption.

The PowerFlex 755 platform is designed specifically for this type of industrial application, with a combination of high-power electrical capability, advanced motor control, network communication and expandable functionality.

The 20G11JC1K5JN4NNNNN represents one of the very large configurations within this family.

Its approximately 1,480 A current rating and 850 kW normal-duty rating make it suitable for major industrial motors rather than ordinary machine-level drive applications.

---

6. Main Product Features

6.1 High-Power Industrial Drive

The first major characteristic is the very high power rating.

With up to approximately 900 kW light-duty capacity, this is a drive designed for large industrial motors.

It is appropriate for equipment where a compact machine drive would not have enough current or power capacity.

Typical applications include large pumps, fans, compressors, conveyors, process equipment and heavy material-handling machinery.

---

6.2 1,480 A Current Rating

The approximately 1,480 A current rating is another major characteristic.

At this current level, the electrical installation becomes an important engineering consideration.

The incoming power system, protection, cabling, busbars, grounding, cabinet ventilation and motor connection all need to be designed for high-current operation.

This also explains why the product uses a large floor-standing cabinet rather than a compact wall-mounted enclosure.

---

6.3 400 VAC Three-Phase Configuration

The model is designed for the 400 VAC three-phase class.

This makes it suitable for industrial electrical systems using 400 V-class motor supplies.

The voltage class must be checked carefully when selecting a replacement.

A similar PowerFlex 755 model configured for 480 VAC or 690 VAC should not automatically be treated as a replacement for a 400 VAC model.

---

7. Air-Cooled Construction

The drive uses forced-air cooling.

High-power semiconductor devices generate considerable heat during operation.

The cooling system therefore plays an important role in long-term reliability.

The installation should provide:

• Adequate ventilation.
• Appropriate ambient temperature.
• Sufficient cabinet clearance.
• Clean airflow.
• Proper fan operation.
• Regular inspection of cooling components.

Dust accumulation, restricted airflow and excessive ambient temperature can increase thermal stress.

For a drive in the 850 kW class, cooling should be treated as an important part of the complete system design rather than as a minor installation detail.

---

8. 800 mm Deep MCC-Style Cabinet

The product is configured as an 800 mm deep MCC-style drive cabinet.

This construction is particularly appropriate for centralized industrial electrical rooms.

Compared with a compact standalone VFD, a packaged cabinet arrangement provides a more complete high-power installation format.

The cabinet can be integrated into larger electrical distribution and motor-control systems.

The 800 mm depth also needs to be considered during:

• Equipment-room planning.
• Cable routing.
• Front-access planning.
• Maintenance clearance.
• Transportation.
• Door-opening clearance.
• Floor loading.

---

9. Enhanced LCD Human Interface

A significant feature of the JN4 configuration is the enhanced LCD full-numeric HIM.

This provides local access to drive parameters, status information, fault information and operating functions.

For large industrial drives, a local operator interface can be useful during commissioning and maintenance.

It can reduce the need to connect an external programming device for every basic diagnostic operation.

The HIM configuration is identified as an Enhanced LCD, Full Numeric, IP66 / NEMA Type 4X/12 interface.

---

10. Embedded EtherNet/IP

The product includes embedded EtherNet/IP capability.

This allows the drive to communicate with a suitable industrial automation network.

Typical data exchanged with a control system can include:

For large factories, this is a major practical advantage.

The drive can become part of the overall automation architecture rather than functioning as an independent motor controller.

---

11. Input Configuration

The catalog configuration uses AC input with precharge and DC terminals.

Precharge is important in large drives because the DC bus contains substantial energy-storage components.

The input arrangement is designed for high-power industrial operation.

The input configuration should be considered together with the upstream transformer, switchgear, protective equipment and plant short-circuit conditions.

---

12. Filtering and CM Jumper

The model is configured with filtered input and an installed CM jumper.

This is an important distinction when comparing catalog numbers.

Two PowerFlex 755 drives with identical voltage, current and power ratings can still have different electrical configurations because of differences in filtering, common-mode configuration, braking and operator-interface options.

Therefore, the complete catalog number should be checked when replacing an existing drive.

---

13. Dynamic Braking

The specified configuration is listed with no dynamic braking.

This matters for applications involving high inertia or rapid stopping.

Examples include:

• Large conveyors.
• High-inertia fans.
• Certain process machines.
• Large rotating equipment.
• Rapid-stop applications.

If the mechanical system needs fast deceleration, the required braking strategy should be evaluated separately.

The absence of standard dynamic braking does not mean the drive cannot be used on such equipment. It means the complete braking and energy-management arrangement needs to be designed according to the application.

---

14. Motor Control

The PowerFlex 755 platform provides several motor-control methods.

V/Hz Control

V/Hz control is suitable for applications with relatively straightforward speed-control requirements.

Typical examples include some pump and fan applications.

It is relatively simple and can be effective when advanced torque regulation is not required.

---

Sensorless Vector Control

Sensorless vector control provides better speed and torque performance than basic V/Hz control without necessarily requiring a physical encoder.

It is suitable for many industrial machines where speed regulation and torque response need to be improved.

---

Advanced Vector Control

Advanced vector control is useful for more demanding applications.

It can provide stronger torque regulation and better dynamic response.

This can be valuable for:

• Conveyors.
• Compressors.
• Process machinery.
• High-inertia loads.
• Material-handling equipment.

---

15. Main Industrial Applications

15.1 Large Pumps

Large pumps are one of the most suitable application categories.

Potential applications include:

• Water transfer.
• Cooling water.
• Industrial process water.
• Wastewater.
• Raw-water pumping.
• Large circulation systems.
• Industrial irrigation.

Variable-speed operation allows the pump to respond to actual process requirements.

This can provide better flow control and can potentially reduce energy consumption when full flow is not continuously required.

---

16. Large Fans and Blowers

Large fans can consume substantial amounts of power.

The drive can regulate fan speed according to the required airflow.

Typical applications include:

• Furnace ventilation.
• Industrial exhaust.
• Dust collection.
• Combustion air.
• Cooling systems.
• Process ventilation.
• Cement-process fans.
• Industrial blowers.

A variable-speed approach can be particularly valuable where the required airflow changes throughout the production cycle.

---

17. Large Conveyors

The drive is well suited to large conveyors.

Conveyors often have significant mechanical inertia.

Starting a large conveyor too aggressively can create unnecessary stress on belts, gearboxes, shafts and couplings.

A variable frequency drive can establish a controlled acceleration profile.

This provides a smoother transition from zero speed to operating speed.

It can also make speed changes easier to coordinate with upstream and downstream equipment.

---

18. Mining Applications

Mining systems commonly use high-power motors.

Possible applications include:

• Ore conveyors.
• Coal conveyors.
• Crushers.
• Feeders.
• Dewatering pumps.
• Ventilation systems.
• Material-processing machinery.

The combination of high current capacity and advanced motor control makes the PowerFlex 755 platform suitable for many large mining machines.

The final drive selection should nevertheless consider the mechanical load, overload requirements and environmental conditions.

---

19. Cement Industry Applications

Cement production uses large motors throughout the process.

Typical applications include:

For continuous-process plants, network communication and diagnostic information can also be important because unexpected motor or drive downtime can affect the entire production process.

---

20. Steel and Metal Processing

Large steel-processing systems can use high-power motors for pumps, fans, conveyors and process equipment.

Possible applications include:

• Cooling-water systems.
• Process fans.
• Conveyors.
• Material-handling systems.
• Large pumps.
• Auxiliary machinery.
• Production-line equipment.

The drive’s ability to communicate with an industrial control system makes it suitable for integrated production environments.

---

21. Pulp and Paper Applications

Pulp and paper plants frequently operate large pumps, fans, conveyors and process machines.

The drive can provide:

• Variable speed.
• Controlled acceleration.
• Controlled deceleration.
• Torque management.
• Network communication.
• Diagnostic information.

This combination can improve process control and equipment monitoring.

---

22. Product Advantages

22.1 High Power Capability

The 900 kW light-duty and 850 kW normal-duty ratings make this a high-capacity industrial drive.

It can serve motor loads that are far beyond the practical range of compact drives.

---

22.2 High Current Capacity

The 1,480 A rating provides substantial output-current capability.

This makes the product suitable for very large industrial motors.

---

22.3 Advanced Motor Control

The PowerFlex 755 platform provides more sophisticated motor control than a simple motor starter.

The drive can regulate motor speed and torque according to process requirements.

---

22.4 Industrial Network Integration

Embedded EtherNet/IP provides direct integration with appropriate industrial control systems.

This can simplify system architecture and provide centralized monitoring.

---

22.5 Local Operator Interface

The enhanced LCD full-numeric HIM gives operators and maintenance personnel a convenient local interface.

This is especially useful during commissioning, troubleshooting and routine maintenance.

---

22.6 Expandable Architecture

The PowerFlex 755 platform can be expanded with compatible option modules.

Depending on the configuration, additional functions can include:

• I/O.
• Encoder feedback.
• Additional communications.
• Safety functions.
• Application-specific capabilities.

This makes the platform more adaptable to different industrial systems.

---

22.7 Controlled Acceleration

The drive can accelerate large motors according to a programmed ramp.

This can reduce mechanical shock.

It can be particularly useful for:

• Conveyors.
• Pumps.
• Fans.
• Compressors.
• Large rotating machinery.

---

22.8 Potential Energy Savings

Variable-speed operation can provide energy savings in suitable applications.

The greatest potential generally exists where a pump or fan does not need to operate at full speed continuously.

Actual savings depend on the mechanical system and operating profile.

---

23. Dimension and Weight Information

Because the user specifically requires dimensions and weight, the following table separates the confirmed cabinet-depth information from the overall planning values.

The 800 mm depth is explicitly associated with the catalog configuration, while the listed equipment weight is approximately 1,246.47 kg.

For the height and width, it is preferable not to manufacture a precise number where the exact cabinet drawing is not available. The physical configuration can vary with the packaged arrangement and options.

For shipping and structural engineering, the 1,246.47 kg value should also be distinguished from the final packed shipping weight.

---

24. Electrical and Installation Requirements

A drive operating at approximately 1,480 A requires substantial electrical infrastructure.

Important considerations include:

The drive should therefore be treated as part of a complete electrical system.

---

25. Energy Efficiency Considerations

The drive itself should not be viewed simply as an energy-saving device.

Its energy-saving value comes primarily from allowing the motor to operate at a speed appropriate to the process.

For example, a centrifugal pump may not need 100% speed throughout the entire day.

If process demand decreases, the drive can reduce motor speed.

This can potentially reduce motor power consumption substantially.

The same principle can apply to large fans and blowers.

Actual savings depend on:

• Operating hours.
• Process demand.
• Pump or fan characteristics.
• Motor efficiency.
• System resistance.
• Control method.
• Required pressure.
• Required flow.

Therefore, an energy study should be performed using the actual process operating profile.

---

26. Maintenance and Reliability

For an 850 kW-class industrial drive, preventive maintenance is important.

Cooling System

Fans should be inspected for abnormal noise, vibration and reduced airflow.

Air passages should remain clean.

---

Electrical Connections

High-current electrical connections should be installed and maintained correctly.

Loose connections can generate heat and create serious reliability problems.

---

DC Bus

The DC bus contains stored electrical energy.

Appropriate isolation and discharge procedures must be followed before internal maintenance.

---

Cabinet Environment

The cabinet should be kept within the applicable temperature, humidity and contamination limits.

Dust and moisture can reduce electrical insulation performance and cooling efficiency.

---

27. Five Recommended Models from the Same Series or Closely Related Models

The following models are useful comparisons within the PowerFlex 755 family.

The 400 V models are the closest comparisons because they share the same basic voltage class. The 480 V and 690 V configurations are more appropriate when the plant electrical system and motor use those voltage classes. The published PowerFlex 755 catalog range shows the K4, K5 and K6 400 V configurations as progressively higher-capacity models.

---

28. Comparison of the Five Same-Series Models

The 20G11JC1K5JN4NNNNN sits in the middle of the closely related 400 V K4/K5/K6 configurations.

It is therefore particularly useful when the motor is in the approximately 850 kW normal-duty class.

---

29. Five Popular Models from the Same Brand

For a broader product comparison, the following models represent different sections of the same industrial drive portfolio.

The PowerFlex 755 catalog includes configurations ranging from much smaller current ratings to very large Frame 9 high-power drives, making the family suitable for applications with substantially different motor sizes.

---

30. Broader Model Selection

25B-D010N114

This model belongs to the PowerFlex 525 family and is intended for much smaller motor applications.

It is appropriate for compact machinery, smaller pumps, fans, conveyors and general machine-control applications.

It is not a direct replacement for the 20G11JC1K5JN4NNNNN.

The main reason to consider it is when the actual motor is much smaller and a high-power cabinet drive would be excessive.

---

25B-D017N114

This is another PowerFlex 525 configuration suitable for smaller industrial equipment.

It is useful for applications where compact size, straightforward installation and moderate motor power are more important than the enormous current capacity of the PowerFlex 755 Frame 9 platform.

---

20F11NC011JA0NNNNN

This model belongs to the PowerFlex 753 family.

It is more appropriate for medium-sized industrial machinery.

The PowerFlex 753 platform provides a useful alternative when the application requires industrial motor control but does not require the enormous power capacity of the 20G11JC1K5JN4NNNNN.

---

20G11JC1K4JN4NNNNN

This is a close PowerFlex 755 alternative.

Its approximately 1,465 A current rating and 800 kW normal-duty rating place it slightly below the K5 configuration.

It is useful when the motor requirement is below the 850 kW normal-duty class.

---

20G11JC1K6JN4NNNNN

This is a higher-capacity 400 V PowerFlex 755 configuration.

It provides approximately 1,590 A current capacity and approximately 900 kW normal-duty power.

It can be considered when the K5 configuration does not provide enough current capacity.

---

31. Application Comparison

---

32. Advantages Compared with a Conventional Motor Starter

---

33. Advantages for Pump Systems

For a large pump, running continuously at full speed is not always necessary.

The drive can adjust motor speed according to process demand.

Potential benefits include:

• Improved flow regulation.
• Reduced pressure fluctuations.
• Controlled acceleration.
• Reduced mechanical shock.
• Potential energy savings.
• Better process stability.

This can be especially useful for water treatment, cooling-water systems and industrial process pumping.

---

34. Advantages for Fan Systems

Industrial fans often operate under changing airflow requirements.

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

Potential benefits include:

• Better airflow regulation.
• Improved pressure control.
• Reduced unnecessary operation at full speed.
• Controlled startup.
• Better process response.
• Potential energy savings.

---

35. Advantages for Conveyor Systems

Large conveyors are often mechanically demanding.

The drive can provide controlled acceleration rather than applying full motor torque immediately.

This can reduce mechanical stress on:

• Belts.
• Gearboxes.
• Couplings.
• Shafts.
• Bearings.
• Pulleys.

It can also improve coordination between multiple conveyor sections.

---

36. Advantages for Continuous-Process Plants

The PowerFlex 755 architecture is particularly useful in continuous industrial processes.

In these facilities, a drive failure can potentially stop a large section of the production process.

Network communication and diagnostics can help operators identify abnormal conditions earlier.

The drive can provide information to the control system, while the control system can manage operating speed and process requirements.

This makes the drive part of the plant’s overall control strategy.

---

37. Selection Considerations

Before selecting the 20G11JC1K5JN4NNNNN, the following parameters should be checked.

---

38. Important Installation Note

The 1,246.47 kg equipment weight means that this is not a lightweight cabinet.

The installation location should be evaluated for:

• Floor loading.
• Transportation path.
• Door openings.
• Lifting equipment.
• Crane capacity.
• Cabinet positioning.
• Maintenance access.
• Cable routing.

The drive should be treated as a major electrical installation rather than a simple plug-in component.

---

39. Product Strengths Summary

---

40. Final Product Assessment

The 20G11JC1K5JN4NNNNN is a high-power industrial PowerFlex 755 AC Packaged Drive designed for large three-phase AC motor applications.

Its combination of 400 VAC operation, 1,480 A rated current, 900 kW light-duty capacity, 850 kW normal-duty capacity and 710 kW heavy-duty capacity makes it suitable for some of the larger motor-control applications found in industrial facilities.

The Frame 9, air-cooled, 800 mm deep MCC-style cabinet provides a practical format for centralized electrical-room installations. The embedded EtherNet/IP capability makes the drive particularly suitable for modern industrial automation systems where drive commands, operating data and diagnostics need to be exchanged with a supervisory control system.

The enhanced LCD full-numeric HIM is another useful feature of this exact configuration. It provides a local operator and maintenance interface, which is valuable during commissioning, troubleshooting and service work.

From an application perspective, the model is particularly well suited to large pumps, large fans, conveyors, compressors, mining machinery, cement-processing equipment, steel-processing equipment, water-treatment systems, pulp-and-paper machinery and other high-power continuous-process equipment.

Its principal advantages are high current capacity, high power capability, advanced motor control, embedded industrial communication, local operator access, expandable architecture and cabinet-based industrial construction.

The physical size and weight also need to be considered seriously. The cabinet is approximately 800 mm deep, while a listed equipment weight is approximately 1,246.47 kg. This makes floor loading, transportation, lifting and maintenance access important parts of the project design.

For applications requiring approximately 850 kW normal-duty capacity at 400 VAC, this model is a strong choice within the PowerFlex 755 family.

The closest same-series comparisons are 20G11JC1K4JN4NNNNN, 20G11JC1K5JN4NNNNN, 20G11JC1K6JN4NNNNN, 20G11JD1K4JN4NNNNN and 20G11JF1K4JN4NNNNN.

Among them, the 20G11JC1K4JN4NNNNN is a lower-capacity 400 V option, the 20G11JC1K6JN4NNNNN is a higher-capacity 400 V option, while the 20G11JD1K4JN4NNNNN and 20G11JF1K4JN4NNNNN provide alternatives for 480 V and 690 V electrical systems respectively. The published catalog range confirms the progression of these PowerFlex 755 configurations.

For broader product selection, smaller models such as 25B-D010N114, 25B-D017N114 and 20F11NC011JA0NNNNN are more appropriate when the motor power is substantially lower.

In practical terms, the 20G11JC1K5JN4NNNNN should be considered a large-frame, high-current, high-power industrial variable frequency drive for demanding 400 V motor applications where controlled speed, torque management, automation integration, diagnostics and reliable cabinet-based operation are required.

For final replacement selection, the most important checks are the motor nameplate voltage, motor full-load current, motor power, required overload, duty cycle, acceleration requirements, braking requirements, feedback requirements, communication architecture, environmental conditions and physical installation space. A model with a similar catalog number should not automatically be treated as a direct replacement without checking the complete configuration.