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1. Product Overview

The 20G11LC1K6JN0NNNNN is a high-power air-cooled AC variable frequency drive from the PowerFlex 755 product series.

It is designed for large three-phase AC motor applications where precise speed control, controlled acceleration and deceleration, process integration, and high-capacity motor control are required.

This particular configuration is a 400 VAC, three-phase, 1,590 A drive. Its published power ratings are approximately 1,000 kW for light duty, 900 kW for normal duty, and 710 kW for heavy duty.

The product is intended for demanding industrial installations such as large pumps, fans, blowers, conveyors, cooling systems, water-treatment equipment, mining machinery, cement equipment, material-handling systems, and other large rotating machines.

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2. Basic Product Information

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3. Brand

The 20G11LC1K6JN0NNNNN belongs to the PowerFlex 755 family, which is intended for applications requiring considerably more functionality and capacity than a basic general-purpose motor drive.

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4. Product Series — PowerFlex 755

The PowerFlex 755 series is an industrial AC drive platform intended for applications where motor control, communication, diagnostics, feedback, and integration with an automation system are important.

The series can be configured for different voltage classes, power levels, enclosure arrangements, communication requirements, feedback devices, I/O options, safety functions, and other application requirements.

The requested 20G11LC1K6JN0NNNNN is one of the large-frame configurations.

Its 1,590 A current rating places it firmly in the high-power industrial category.

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5. Detailed Electrical Parameters

The most important electrical parameter for drive selection is normally the motor current, rather than simply the motor’s nominal kW value.

A motor’s actual nameplate current, operating duty, overload requirements, acceleration requirements, and load characteristics should all be considered before selecting the drive.

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6. Power Rating

The model has three important duty ratings.

These ratings should not simply be treated as interchangeable.

A pump or fan with relatively predictable load characteristics may be evaluated using the light-duty or normal-duty rating.

A conveyor or other constant-torque application with demanding starting or overload conditions may require the heavy-duty rating.

Therefore, the correct selection depends on the actual operating profile of the motor.

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7. Light-Duty Rating — 1,000 kW

The approximately 1,000 kW light-duty rating makes this model suitable for extremely large variable-torque applications.

Typical examples include:

• Large centrifugal pumps
• Large cooling-water pumps
• Large fans
• Large ventilation systems
• Cooling tower equipment
• Large blowers
• Industrial circulation systems

Variable-speed operation can allow the motor to operate closer to the process requirement instead of continuously running at a fixed speed.

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8. Normal-Duty Rating — 900 kW

The approximately 900 kW normal-duty rating is particularly relevant to general industrial motor applications.

Possible applications include:

• Large pumps
• Large fans
• Large blowers
• Conveyors
• Material-handling equipment
• Water-treatment equipment
• Industrial process machinery
• Cooling systems

For a normal-duty application, the 900 kW rating provides a very substantial operating range.

The motor’s nameplate current should still be checked against the applicable drive rating.

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9. Heavy-Duty Rating — 710 kW

The approximately 710 kW heavy-duty rating is relevant when the application places greater demands on the drive.

Heavy-duty applications can include machinery with:

• High starting torque
• High inertia
• Repeated acceleration
• Frequent stopping
• Constant-torque characteristics
• Significant overload requirements
• Difficult starting conditions
• Heavy material loads

For these applications, the heavy-duty rating should be used as the primary selection reference.

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10. Dimensions

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

The depth is therefore an important mechanical installation parameter.

For the exact overall height and width, the final mechanical configuration should be checked against the equipment drawing.

This is especially important when the drive is being installed into an existing electrical room or MCC lineup.

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11. Weight

Because the product is a very large Frame 10 packaged drive, the exact physical weight can vary depending on the configuration and installed components.

Rather than giving an unverified number, the following table separates the information that can safely be stated from the information that needs to be confirmed from the final configured unit.

For transportation, lifting, structural calculations and cabinet-floor loading, the actual configured product weight should be used.

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12. Product Introduction

The 20G11LC1K6JN0NNNNN is intended for controlling large AC motors in industrial environments.

Instead of connecting a large motor directly to a fixed-frequency electrical supply and operating it at essentially one speed, the drive allows motor speed and operating characteristics to be controlled according to the process requirement.

This makes the product particularly useful when the motor is connected to equipment whose operating requirement changes during production.

For example, a large pump may not need to run at full speed throughout the entire production cycle.

A large fan may require different airflow at different times.

A conveyor may need controlled acceleration rather than an abrupt start.

A blower may need its speed to change according to air demand.

In each case, the drive provides an adjustable-speed interface between the electrical supply and the motor.

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13. Main Product Functions

The major functions associated with this type of drive include:

• AC motor speed control
• Variable-frequency operation
• Controlled motor acceleration
• Controlled motor deceleration
• Motor current monitoring
• Drive status monitoring
• Fault and alarm management
• Industrial network communication
• Process integration
• Adjustable speed reference
• Large-motor control

The drive can therefore function as an important part of an automated production system rather than simply serving as a motor starter.

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14. Communication Capability

The configuration includes embedded EtherNet/IP capability.

This is useful in industrial automation systems where the drive needs to exchange information with a control system.

Typical information may include:

For large production systems, this can reduce the need for isolated motor-control equipment.

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15. Product Applications

15.1 Large Pumping Systems

Large pumps are one of the most appropriate application categories for a high-capacity variable frequency drive.

Potential applications include:

• Industrial water pumps
• Cooling-water pumps
• Process-water pumps
• Circulation pumps
• Wastewater pumps
• Water-transfer pumps
• Utility pumps

The ability to adjust motor speed can be useful when the required flow or pressure changes.

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15.2 Large Fans

Large industrial fans can require hundreds of kilowatts of motor power.

Typical applications include:

• Industrial ventilation
• Furnace ventilation
• Process exhaust
• Cooling fans
• Combustion-air systems
• Dust-control systems
• Large air-handling systems

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

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15.3 Large Blowers

Large blowers can require substantial motor power.

Potential applications include:

• Aeration
• Process air
• Combustion air
• Dust collection
• Industrial ventilation
• Air supply
• Process gas movement

The high current capability of this model makes it appropriate for evaluation in very large blower systems.

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15.4 Large Conveyors

Large conveyors often present significant starting and acceleration challenges.

Typical applications include:

• Mining conveyors
• Cement conveyors
• Aggregate conveyors
• Bulk-material conveyors
• Port handling equipment
• Heavy industrial material handling

Controlled acceleration can reduce mechanical shock on belts, couplings, gearboxes and other mechanical components.

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15.5 Mining

Mining operations frequently use high-power motors.

Potential applications include:

• Long-distance conveyors
• Mine dewatering pumps
• Ventilation fans
• Material-handling equipment
• Processing machinery
• Large auxiliary equipment

Environmental factors such as dust, temperature, altitude and vibration need to be considered carefully when designing a mining installation.

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15.6 Cement and Aggregate

Large cement and aggregate facilities use substantial rotating equipment.

Potential applications include:

• Process fans
• Conveyors
• Blowers
• Pumps
• Cooling systems
• Material-handling equipment
• Ventilation systems

The drive can provide adjustable-speed control for equipment whose operating requirements change during production.

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16. Advantages of the Product

16.1 Very High Current Capacity

The 1,590 A rating is one of the most important characteristics of this model.

It allows the drive to be considered for very large three-phase AC motors.

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16.2 High Power Capability

The drive supports approximately:

• 1,000 kW Light Duty
• 900 kW Normal Duty
• 710 kW Heavy Duty

This provides flexibility across different industrial load types.

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16.3 Variable-Speed Operation

The motor does not have to operate continuously at one fixed speed.

The operating speed can be adjusted according to process requirements.

This is particularly useful for pumps, fans, blowers and conveyors.

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16.4 Controlled Acceleration

Large motors can have substantial inertia.

Controlled acceleration can provide a smoother transition from stopped to operating speed.

This can reduce mechanical shock compared with an uncontrolled full-speed start.

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16.5 Controlled Deceleration

Controlled deceleration can provide a more predictable stopping process.

This is useful for high-inertia machinery and large rotating equipment.

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16.6 Automation Integration

Embedded EtherNet/IP allows the drive to be integrated into a wider control architecture.

This can be useful for centralized operation and monitoring.

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16.7 High-Power Industrial Construction

The Frame 10, 800 mm deep MCC-style configuration is designed for substantial industrial installations.

It is appropriate for applications where large motor-control equipment must be integrated into an industrial electrical system.

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17. Recommended Same-Series Models

The following models are useful for comparison because they are in the same PowerFlex 755 range and include configurations close to the requested K6 capacity.

Among these, the K4, K5, and K6 configurations are particularly useful when comparing high-current 400 VAC installations.

The D2K0 configuration moves into a higher-current 480 VAC class and should not be treated as a direct drop-in replacement without checking the motor and electrical system.

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18. Closest K4 / K5 / K6 Comparison

The requested K6 configuration provides the greatest current and power capacity among these closely related 400 VAC models.

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19. Five Closely Related Models

The K0 through K6 progression is useful when selecting a drive according to motor current and power requirements.

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20. Five Representative Popular Models Under the Same Brand

For a broader product comparison, the following models represent different capacity levels and product categories.

The models above are more useful as capacity references than as direct replacements.

Voltage, current, duty rating, motor type, enclosure requirements and installation configuration should all be checked before substitution.

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21. Application Selection Table

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22. Electrical Installation Considerations

A drive with a rating of approximately 1,590 A requires careful electrical engineering.

The incoming electrical equipment should be selected according to the actual drive input characteristics.

The following areas should be evaluated:

• Incoming power capacity
• Short-circuit protection
• Cable sizing
• Grounding
• Motor cable selection
• Motor insulation
• Disconnect equipment
• Harmonic considerations
• Cabinet ventilation
• Ambient temperature
• Installation altitude
• Electrical clearances

The drive should be treated as a major electrical component rather than as a small standalone controller.

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23. Motor Selection

The motor should be checked against the drive in several areas.

The motor nameplate current is especially important.

A motor rated at a particular kW value may have different current requirements depending on motor efficiency, power factor, design and operating voltage.

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24. Cooling and Environmental Considerations

The model is air cooled.

At this power level, heat management is an important part of installation design.

The installation should provide sufficient airflow around the equipment.

Important factors include:

• Clean cooling air
• Correct ventilation
• Appropriate cabinet clearance
• Fan operation
• Avoidance of hot-air recirculation
• Ambient temperature
• Dust concentration
• Humidity
• Altitude
• Maintenance access

If the cooling system is not maintained correctly, excessive temperature can become a significant reliability concern.

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25. Maintenance Recommendations

For large production systems, preventive maintenance is especially important because a drive failure can stop a major production process.

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26. Advantages in Pump Applications

A fixed-speed pump often operates at one basic speed even when the actual flow requirement changes.

With variable-speed control, the motor can be adjusted according to the process.

Possible benefits include:

• Adjustable flow
• Adjustable pressure
• Smoother starting
• Controlled stopping
• Improved process flexibility
• Reduced mechanical shock
• Easier automation
• Centralized monitoring

This makes the drive particularly attractive for large pumping systems.

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27. Advantages in Fan Applications

Fan systems frequently operate under changing airflow requirements.

A variable frequency drive can adjust motor speed to match the actual process demand.

Potential benefits include:

• Adjustable airflow
• Better process control
• Controlled startup
• Controlled shutdown
• Reduced mechanical stress
• Easier automation
• Better coordination with other plant equipment

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28. Advantages in Conveyor Applications

Large conveyors can have substantial inertia.

Starting a large conveyor too aggressively can place considerable mechanical stress on:

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

Controlled acceleration allows the machine to reach operating speed progressively.

This can make the drive a valuable component in large material-handling systems.

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29. Advantages in Blower Applications

Large blowers often need to operate at different air-delivery levels.

A variable-speed drive can provide a more flexible operating point.

Typical advantages include:

• Adjustable air volume
• Controlled startup
• Controlled stopping
• Process coordination
• Centralized monitoring
• Flexible operating speed

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30. Why the K6 Configuration Is Important

Within the closely related 400 VAC K-series configurations, the K6 rating provides a significant increase in capacity.

The approximate progression is:

This makes the K6 configuration particularly useful when the motor current is too high for the lower K4 or K5 selection.

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31. Product Advantages at a Glance

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32. Final Technical Specification

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33. Overall Assessment

The 20G11LC1K6JN0NNNNN is a high-capacity industrial variable frequency drive intended for applications where the motor power and current requirements are too large for conventional small and medium-sized drives.

Its key specification is the 1,590 A current rating at 400 VAC, combined with approximately 1,000 kW light-duty, 900 kW normal-duty and 710 kW heavy-duty ratings.

The model is especially suitable for large pumps, fans, blowers, conveyors, cooling systems, mining equipment, cement machinery, water-treatment equipment and other large industrial rotating equipment.

The PowerFlex 755 platform also provides the communication and control capabilities required in modern automated production environments.

The 800 mm deep MCC-style construction should be taken into account during mechanical planning.

For weight, overall cabinet height and width, the exact configured equipment should be checked before transportation, lifting or cabinet-design calculations. It is better to mark these values as To Be Confirmed than to use an estimated figure as an engineering specification.

For replacement or model selection, the most important comparison points are 400 VAC input class, motor nameplate current, light/normal/heavy-duty rating, overload requirements, motor torque, acceleration time, load inertia, enclosure arrangement, cooling requirements and communication requirements.

Among the closely related configurations, the K4 → K5 → K6 progression provides a convenient way to compare increasing power capacity. The 20G11LC1K6JN0NNNNN sits at the higher end of this 400 VAC group and is therefore best considered for very large motor applications where a substantial current margin is required.