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Allen-Bradley 20G11LC1K0JN0NNNNN — PowerFlex 755 High-Power AC Drive

1. Product Overview

The 20G11LC1K0JN0NNNNN is a large-frame, air-cooled AC variable frequency drive belonging to the PowerFlex 755 series.

It is designed for large industrial motor applications where high current capacity, stable variable-speed operation, industrial communication, flexible motor control and robust cabinet construction are required.

This particular configuration is a 400 VAC, three-phase, 1040 A drive with a Frame 9 construction. It uses forced-air cooling, an 800 mm deep MCC-style cabinet, Type 1 / IP20 protection, an integrated EtherNet/IP interface, AC input with DC terminals, and no dynamic-braking transistor.

The drive has a listed power capability of approximately 630 kW for light-duty applications, 560 kW for normal-duty applications and 500 kW for heavy-duty applications. The exact applicable rating depends on the load profile and duty classification.

One important detail is that the 20G11LC1K0JN0NNNNN is the configuration with a blank/no HIM operator interface. This distinguishes it from closely related configurations that include an enhanced LCD HIM or other operator-interface arrangements.

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2. Brand and Product Series

The PowerFlex 755 family is positioned for demanding industrial motor-control applications, including pumps, fans, conveyors and other large rotating equipment.

The large Frame 9 configuration makes this particular model considerably different from compact drives used in small machines. It is intended for plant-level electrical installations, MCC areas and large industrial equipment.

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3. Detailed Technical Parameters

The 800 mm figure is the cabinet-depth classification for this MCC-style configuration. It should not be interpreted as the complete height × width × depth dimension of the finished installation.

For a Frame 9 packaged drive, the overall dimensions depend on the exact enclosure arrangement and mechanical configuration. Therefore, the final dimensional drawing should be used for cabinet design, transportation planning and installation clearance.

Likewise, the weight should not be estimated from the dimensions of a small standalone drive. This is a large packaged Frame 9 assembly, and the final mass depends on the construction and selected options. For procurement and lifting planning, the actual equipment documentation should be treated as the controlling value.

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4. Electrical Rating

The most important electrical characteristic of the 20G11LC1K0JN0NNNNN is its high-current 400 V architecture.

The catalog configuration is rated at 1040 A, with the following duty ratings:

This distinction is important when matching the drive to a motor.

A pump with a relatively stable load may have a different drive-sizing requirement from a crusher, conveyor or hoist-type application that repeatedly demands high torque and overload capability.

For final selection, the motor’s rated voltage, full-load current, overload requirement, operating speed range and load characteristics should be considered together.

The 1040 A figure should therefore not be interpreted as meaning that every 1040 A motor application can automatically use the drive under every duty condition.

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5. Understanding the Model Number

The catalog number 20G11LC1K0JN0NNNNN identifies a specific configuration of the PowerFlex 755 platform.

The complete catalog number should always be treated as one configuration code.

For practical identification, the most important characteristics of this particular model are:

400 VAC + 1040 A + Frame 9 + 800 mm MCC style + IP20/Type 1 + air cooled + EtherNet/IP + no dynamic braking + no HIM.

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6. Product Introduction

The PowerFlex 755 platform is designed around the requirements of industrial motor control.

Unlike a small variable-frequency drive intended for a single machine, a Frame 9 PowerFlex 755 is built for large electrical installations and substantial motor loads.

The 20G11LC1K0JN0NNNNN is particularly suitable for plants where motors are large enough to require several hundred kilowatts of power.

The 400 V input class makes it appropriate for large industrial motors operating on 400 V three-phase systems.

The air-cooled construction provides a practical solution for removing heat from the drive’s power electronics. At this power level, thermal management is a major part of system reliability.

The integrated EtherNet/IP capability also makes the drive suitable for connection to a plant automation network.

This allows the drive to function as part of a larger control system rather than simply acting as an independent motor speed controller.

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7. Product Applications

7.1 Large Industrial Pumps

Large pumps are one of the most common applications for high-power variable-frequency drives.

A drive allows pump speed to be adjusted according to process requirements.

Instead of maintaining the motor at a fixed speed and relying entirely on valves or mechanical control methods, the drive can change motor speed to match the required flow or pressure.

Potential applications include:

• Water circulation
• Industrial cooling
• Process-water systems
• Wastewater treatment
• Chemical processing
• Industrial utilities
• Large-scale irrigation

For continuously operating pumps, the ability to match motor speed to actual process demand can be particularly useful.

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7.2 Large Fans and Blowers

Industrial fans can consume substantial amounts of electrical power, particularly when they operate continuously.

Variable-speed control allows airflow to be adjusted according to actual requirements.

Typical applications include:

• Furnace fans
• Process exhaust
• Dust collection
• Industrial ventilation
• Cooling systems
• Air-handling systems
• Large combustion-air systems

The PowerFlex 755 platform is well suited to this type of application because it combines high power capability with industrial control functions.

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7.3 Conveyor Systems

Large conveyors frequently require controlled acceleration and deceleration.

A high-power drive can provide smoother motor-speed changes than a simple fixed-speed motor arrangement.

This can reduce mechanical shock on:

• Conveyor belts
• Gearboxes
• Couplings
• Bearings
• Shafts
• Drive pulleys
• Mechanical structures

Large conveyors in mining, cement, aggregate handling, ports and heavy manufacturing can therefore be suitable applications.

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7.4 Compressors

Large compressors can require several hundred kilowatts of motor power.

Variable-speed operation can allow the compressor to respond to changes in production demand or system pressure.

The 400 V / 1040 A configuration provides the electrical capacity required for many large compressor installations.

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7.5 Mining and Bulk-Material Handling

Mining facilities use large motors for:

• Conveyors
• Pumps
• Fans
• Crushers
• Material handling
• Processing equipment

The large-frame PowerFlex 755 architecture is appropriate for these applications because the motor-control equipment can be integrated into a larger plant automation system.

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7.6 Cement Plants

Cement and aggregate plants contain numerous high-power motor loads.

Potential applications include:

• Raw-material handling
• Large fans
• Crushers
• Conveyors
• Pumps
• Process ventilation
• Auxiliary machinery

The ability to control large motors while exchanging operational data with the automation system is valuable in these environments.

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7.7 Steel and Metal Processing

Large steel and metal-processing facilities can use high-power motors throughout the production process.

Possible drive applications include:

• Large pumps
• Cooling equipment
• Ventilation
• Material handling
• Auxiliary process machinery
• Conveyor systems
• Large fans

The drive can provide variable-speed control while allowing operating information to be incorporated into the plant’s control architecture.

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8. Main Product Advantages

8.1 High Current Capacity

The 1040 A current class is the main reason to select this model.

It is intended for motor loads that are far beyond the capacity of compact general-purpose drives.

For a large 400 V motor installation, having more than 1000 A of drive capacity provides a substantial operating range.

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8.2 High Power Capability

The drive can be applied to motors in the several-hundred-kilowatt range.

Its approximate ratings are:

This gives engineers flexibility when matching the drive to different load characteristics.

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8.3 400 VAC Industrial Compatibility

The 400 V configuration is well suited to industrial plants using 400 V three-phase distribution.

For large motors, this provides a straightforward relationship between the plant electrical system, motor voltage and drive input/output voltage class.

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8.4 Embedded EtherNet/IP

Embedded EtherNet/IP is a major practical advantage for automated facilities.

The drive can exchange operating information with a controller or supervisory system.

Typical information can include:

• Speed command
• Actual speed
• Motor current
• Drive status
• Fault status
• Warning status
• Torque-related information
• Operating conditions
• Parameter data

This can reduce dependence on large numbers of individual hardwired signals.

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8.5 Large MCC-Style Construction

The 800 mm deep MCC-style construction is designed around large industrial electrical installations.

It is better suited to electrical rooms, MCC areas and plant-level equipment than to small machine control panels.

The large enclosure format provides the physical space required for high-power electrical equipment and cooling arrangements.

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8.6 Forced-Air Cooling

High-power semiconductor equipment produces considerable heat.

The forced-air architecture provides active cooling for the drive power section.

Correct ventilation and maintenance are therefore essential.

Dust accumulation, blocked ventilation paths, excessive ambient temperature or deteriorated cooling components can negatively affect operating reliability.

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8.7 No Dynamic Braking Configuration

This particular model is configured with no dynamic braking transistor.

That can be an advantage when the application does not require rapid regenerative deceleration.

It can also simplify the basic configuration where external or alternative braking arrangements are not required.

However, for high-inertia loads requiring rapid stopping, the braking requirement should be evaluated before selecting this exact configuration.

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8.8 No HIM Configuration

The model is configured as Blank / No HIM.

This is useful for installations where local operator interaction is not required because the drive is controlled through the automation system.

For example, a plant may have a central HMI or SCADA system through which operators issue speed commands and monitor drive status.

This configuration can therefore be suitable for centralized-control architectures.

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9. Communication and Automation

One of the strongest features of the PowerFlex 755 family is its ability to operate as part of an industrial automation system.

The embedded EtherNet/IP interface allows the drive to exchange data with a controller.

A typical system can be structured as follows:

Controller → Network → PowerFlex 755 → Motor

At the same time, information travels in the opposite direction:

Motor → Drive → Network → Controller

This creates a two-way information path.

The controller can send a speed reference, while the drive can return actual speed, current, status, warnings and faults.

For a large production line, this can make motor control much easier to integrate.

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10. Advantages for Centralized Control

The no-HIM configuration is particularly relevant to centralized automation.

Instead of placing a local keypad on every large drive, an industrial facility can use:

• Central operator stations
• HMI panels
• SCADA systems
• PLC-based control
• Plant-wide Ethernet networks

This can reduce unnecessary local interfaces and make the drive part of a coordinated automation architecture.

For a large plant with many motors, centralized monitoring can also make troubleshooting more efficient.

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11. Installation Considerations

A Frame 9, 1040 A drive should be treated as major industrial electrical equipment.

Physical Space

The cabinet has an 800 mm depth class and requires suitable front and service access.

The final width and height depend on the actual configuration, so the installation should be designed using the specific mechanical drawing.

Weight

The actual packaged weight can vary substantially with the final cabinet configuration.

For transportation and lifting, the final shipping weight should be obtained before installation.

Cooling

Because this is an air-cooled configuration, adequate ventilation is essential.

The installation should prevent hot exhaust air from being drawn back into the cooling intake.

Electrical Protection

The incoming electrical system should be designed around the drive’s rated voltage, current, short-circuit conditions and applicable protection requirements.

Grounding

Large variable-frequency drives require an appropriately designed grounding and bonding system.

Motor Cable

The motor cable should be selected with consideration for current, insulation, cable length, grounding and the characteristics of PWM motor-drive operation.

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12. Five Recommended Models from the Same Series

The following models are closely related PowerFlex 755 configurations and are useful comparison choices for large industrial applications.

The first three models are especially relevant when the motor voltage remains at 400 VAC.

The 690 V models become more appropriate when the motor and plant distribution are based on a 690 V system.

The 480 V alternative is useful for North American-style 480 V industrial systems and other installations using that voltage class.

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13. Same-Series Comparison

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14. Five Related Popular Models from the Same Brand

For users who want to compare the target drive with other commonly encountered large industrial models, the following configurations provide a useful range.

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15. Recommended Model by Motor Voltage

Voltage should normally be considered before current when comparing large drives.

A 400 V motor should not be matched to a 480 V or 690 V drive simply because the alternative has an equal or higher current rating.

The drive voltage class must be compatible with the motor and the electrical system.

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16. Typical Application Matching

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17. Energy-Management Benefits

One of the main reasons to use a variable-frequency drive is the ability to regulate motor speed instead of continuously operating the motor at a fixed speed.

For variable-torque applications such as centrifugal pumps and fans, reducing motor speed can significantly reduce the mechanical power required.

The drive can therefore be used as part of an overall energy-management strategy.

However, actual energy savings depend on the application.

A conveyor with a constant mechanical load behaves differently from a centrifugal fan or pump.

Therefore, energy-saving potential should be evaluated using the actual operating profile rather than assuming a fixed percentage of savings.

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18. Maintenance and Reliability

For a high-power air-cooled drive, cooling-system maintenance is particularly important.

A basic maintenance program should include:

The drive should be installed in an environment appropriate for its IP20 / Type 1 enclosure configuration.

It should not be treated as a sealed outdoor unit simply because it is a large industrial drive.

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19. Why This Model Is Different from the Earlier 20G11LC1K0AN0NNNNN Configuration

The 20G11LC1K0JN0NNNNN is closely related to the 20G11LC1K0AN0NNNNN, but the catalog configuration is different.

The J-version is the active configuration and is specified as:

• 400 VAC
• 1040 A
• 630 kW light duty
• 560 kW normal duty
• 500 kW heavy duty
• Frame 9
• 800 mm deep MCC style
• IP20 / Type 1
• Air cooled
• Embedded EtherNet/IP
• Filtered
• CM jumper installed
• No dynamic braking
• Blank / no HIM

This configuration is therefore especially appropriate for installations where the drive is expected to be operated through a centralized control system rather than through a local keypad.

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20. Engineering Selection Checklist

Before choosing the 20G11LC1K0JN0NNNNN, the following information should be available.

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21. Overall Product Evaluation

The 20G11LC1K0JN0NNNNN is a high-power 400 VAC PowerFlex 755 AC drive designed for large industrial motor-control applications.

Its core specifications are 1040 A current capacity, 630 kW light-duty rating, 560 kW normal-duty rating, 500 kW heavy-duty rating, Frame 9 construction, forced-air cooling, Type 1/IP20 protection, 800 mm deep MCC-style construction and embedded EtherNet/IP communication.

The model is particularly well suited to large pumps, fans, conveyors, compressors, mining equipment, cement machinery, material-handling systems and other high-power rotating machinery.

Its high-current capability is the most obvious advantage, but the complete value of the drive comes from the combination of high power, industrial networking, flexible control, large-frame construction and integration into plant automation.

The no-HIM configuration is particularly useful for centralized-control systems where operators interact with the drive through a PLC, HMI or supervisory system rather than through a local keypad.

For applications requiring more current while remaining at 400 VAC, the 20G11LC1K2JN0NNNNN and 20G11LC1K5JN0NNNNN are logical alternatives.

For 690 V applications, the 20G11LF710JN0NNNNN and 20G11LF960JN0NNNNN are more appropriate comparison points.

For a 480 V system, a 480 V Frame 9 configuration should be selected instead of trying to substitute a 400 V drive.

The final selection should be based primarily on motor voltage, motor full-load current, duty classification, overload requirement and load characteristics, followed by enclosure, cooling, braking, communication and installation requirements.

In short, the 20G11LC1K0JN0NNNNN can be positioned as a large-frame, high-current, 400 V industrial variable-frequency drive for centralized and networked motor-control applications, particularly where a rugged MCC-style installation and several-hundred-kilowatt motor capacity are required.

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22. Quick Technical Summary

The 20G11LC1K0JN0NNNNN is therefore a strong choice for large-scale 400 V industrial motor applications where high output capacity, centralized automation, robust construction and flexible variable-speed control are more important than compact physical size.