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1. Product Identification

The 20G11LC1K1JN0NNNNN is a high-power variable frequency drive intended for large industrial motors and demanding process-control applications.

Its 1090 A output-current rating places it firmly in the high-power drive category. It is designed for applications where a conventional compact inverter is not large enough to handle the motor current or where centralized industrial drive architecture is required.

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2. Product Series

The product belongs to the PowerFlex 755 series.

The PowerFlex 755 series is designed around industrial motor-control applications requiring adjustable speed, controlled acceleration and deceleration, process integration, communication and flexible control functions.

The series covers a broad range of motor sizes, from comparatively smaller industrial installations through very large motors used in heavy industry.

The 20G11LC1K1JN0NNNNN represents a large Frame 9 configuration within this family.

Its 400 VAC, 1090 A arrangement makes it particularly relevant to large 400 V motor systems.

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3. Product Introduction

The 20G11LC1K1JN0NNNNN is an air-cooled AC drive designed to control large three-phase AC motors.

Instead of operating a motor continuously at a fixed speed, the drive regulates the electrical frequency and voltage supplied to the motor.

This allows motor speed to be adjusted according to the actual process requirement.

For example, a large pump does not necessarily need to operate at full speed all the time.

Likewise, an industrial fan may require different airflow levels during different stages of production.

A conveyor may need controlled acceleration when starting with a heavy load.

The drive provides the electrical control platform needed for these types of applications.

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4. Core Electrical Parameters

The 1090 A rating is the key electrical parameter for this model.

When engineering a motor-drive system, the motor nameplate current should be compared directly with the drive’s applicable current rating.

Motor power in kW is useful for preliminary selection, but current and duty classification should ultimately be given greater importance.

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5. Normal-Duty and Heavy-Duty Ratings

The drive has different power ratings depending on the required operating duty.

The difference exists because a heavy-duty application can impose greater thermal and overload demands on the drive.

A large pump or fan with a relatively predictable load profile may be evaluated differently from a conveyor, crusher or other machine requiring repeated acceleration and higher overload capability.

Therefore, the motor should not be selected solely by comparing the motor’s nominal kW with the largest number printed in a catalog.

The actual load profile must be considered.

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6. Physical Dimensions

The model is a large Frame 9 packaged drive.

Its enclosure is specified as an 800 mm deep MCC-style cabinet.

The 800 mm dimension refers to the specified cabinet-depth class.

It should not be interpreted as the complete physical envelope.

For an actual installation drawing, the exact width, height, cable-entry arrangement and service clearances should be taken from the final mechanical configuration.

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7. Weight

Because this is a packaged Frame 9 drive, its total installed and shipping weight can be substantially different from the weight of a basic drive module.

The appropriate engineering description is:

Weight: configuration-dependent kg.

For a high-power cabinet, using an approximate weight in a foundation, lifting or transportation calculation would be poor engineering practice.

The final equipment configuration should therefore be used when an exact kilogram value is required.

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8. Enclosure and Environmental Characteristics

The Type 1 / IP20 arrangement means the drive should be installed in a suitable electrical environment.

It is not intended to be treated as a fully sealed outdoor enclosure.

Environmental conditions such as dust, moisture, corrosive substances and excessive ambient temperature should be considered during system design.

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9. Cooling System

The 20G11LC1K1JN0NNNNN uses forced-air cooling.

At this power level, substantial heat is generated by the power electronics during operation.

The cooling system is therefore an important part of the installation.

The electrical room should provide adequate ventilation and sufficient air circulation.

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

Routine maintenance should include inspection of cooling fans and ventilation paths.

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10. Input Configuration

The drive uses an AC input with precharge.

Precharge is important in a large AC drive because the DC-link capacitors require controlled charging when the drive is energized.

This arrangement helps manage the initial charging process and reduces the electrical stress associated with direct capacitor energization.

The incoming electrical system should be designed with suitable disconnecting, protection, grounding and short-circuit considerations.

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11. Dynamic Braking

This particular configuration is specified with:

Dynamic Braking: None.

This is not necessarily a disadvantage.

For many variable-torque applications, such as large centrifugal pumps and fans, rapid regenerative stopping is not the primary operating requirement.

However, applications involving high-inertia machinery, frequent deceleration or rapid stopping require additional engineering evaluation.

Examples include:

• Large centrifuges
• High-inertia conveyors
• Rapid-cycle machinery
• Certain hoisting applications
• Machinery requiring frequent controlled stopping

The braking requirement should therefore be considered separately from the motor-power requirement.

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12. Operator Interface

This particular catalog configuration is specified with a blank / no HIM arrangement.

That means the drive does not rely on an integrated local Human Interface Module as part of the basic catalog configuration.

This can be useful where the equipment is intended to be operated and monitored from a centralized control system.

A centralized PLC/HMI architecture can be used to provide:

• Start/stop commands
• Speed reference
• Actual speed monitoring
• Current monitoring
• Fault indication
• Alarm indication
• Drive status

The absence of a standard HIM also gives the installation a cleaner packaged configuration where local operator control is not required.

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13. Filtering and CM Jumper

The model includes a filtered configuration with the common-mode jumper installed.

This arrangement is relevant to electromagnetic compatibility and the electrical characteristics of the drive system.

In practical terms, it helps the drive fit into industrial installations where electrical noise and conducted interference need to be considered.

The exact grounding and filtering arrangement should still be coordinated with the motor cable, grounding system and plant electrical architecture.

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14. Communication and Automation

The PowerFlex 755 platform is intended to work as part of an industrial automation system.

The drive can be integrated into a control architecture where the supervisory controller manages motor operation.

Typical information includes:

This type of integration is particularly useful in large industrial plants where many motors are controlled from a central automation system.

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15. Main Applications

15.1 Large Water Pumps

Large water pumps are one of the most natural applications for this drive.

The drive can regulate motor speed to match the required flow or pressure.

Potential applications include:

• Water treatment
• Wastewater treatment
• Industrial water circulation
• Cooling-water systems
• Process-water systems
• Large pumping stations
• Utility water systems

Variable-speed operation can reduce the need for mechanical throttling and can provide more precise process control.

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16. Cooling-Water Systems

Large factories often use pumps to circulate cooling water through heat exchangers and process equipment.

Cooling demand can change significantly during production.

The drive can allow pump speed to follow the changing process requirement.

This makes it useful for:

• Central cooling systems
• Industrial heat-exchanger circulation
• Process cooling
• Equipment cooling
• Cooling-water distribution

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17. Large Fans and Blowers

Large industrial fans frequently use high-power motors.

Typical applications include:

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

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

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18. Conveyor Systems

Large conveyors can place significant demands on their motors.

A controlled acceleration profile can reduce mechanical shock during startup.

This is useful for:

• Mining conveyors
• Cement conveyors
• Aggregate conveyors
• Bulk-material systems
• Port material handling
• Industrial production lines

The drive can also allow conveyor speed to be adjusted according to production requirements.

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19. Mining Applications

The high current capability makes this drive suitable for large mining equipment where substantial motor power is required.

Potential applications include:

• Long-distance conveyors
• Dewatering pumps
• Ventilation fans
• Material-handling equipment
• Processing machinery
• Large auxiliary systems

Mining environments can be demanding, so the actual enclosure and environmental requirements must be evaluated before installation.

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20. Cement and Aggregate Equipment

Cement and aggregate plants commonly contain large motors.

The drive can be considered for:

• Process fans
• Conveyors
• Large pumps
• Material handling
• Dust collection
• Auxiliary machinery
• Process equipment

The ability to vary motor speed can be useful when production conditions change.

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21. Compressor Systems

Large compressors can require hundreds of kilowatts of motor power.

A variable frequency drive can control compressor motor speed according to system demand.

Possible benefits include:

• Adjustable production capacity
• Controlled acceleration
• Flexible operation
• Reduced mechanical shock
• Improved process matching

The actual compressor application should be evaluated carefully because compressor torque characteristics can differ significantly from centrifugal pump and fan loads.

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22. Heavy Manufacturing

The drive can be considered for large rotating machinery used in heavy manufacturing.

Typical applications include:

• Cooling pumps
• Process fans
• Material handling
• Large conveyors
• Auxiliary machinery
• Industrial ventilation
• Process equipment

The large Frame 9 architecture is particularly appropriate for centralized electrical installations.

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23. Major Product Advantages

High Current Capacity

The 1090 A rating is the defining characteristic of the model.

This gives the drive the capacity required for very large 400 VAC industrial motors.

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High Power Capability

The 630 kW normal-duty rating and 500 kW heavy-duty rating provide substantial motor-control capacity.

This places the drive in a class suitable for large process equipment.

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Large Industrial Frame

The Frame 9 construction is designed for high-power industrial systems.

It provides a physically larger platform capable of supporting the electrical and thermal requirements associated with large motor drives.

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Forced-Air Cooling

Forced-air cooling provides a practical method of removing heat from high-power semiconductor equipment.

Correct airflow is essential to achieving reliable operation.

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Industrial Networking

The PowerFlex 755 platform supports integration with plant-level automation.

This is useful when a large motor needs to be controlled and monitored from a central control system.

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Variable-Speed Operation

The drive allows the motor to operate at different speeds instead of remaining continuously at a fixed speed.

This is especially valuable in pump and fan applications.

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Controlled Acceleration

The drive can provide controlled motor acceleration.

This can reduce mechanical shock on the motor and driven equipment.

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24. Advantages for Pump Applications

For centrifugal pumps, variable-speed control can be especially useful.

Instead of maintaining full motor speed and controlling flow primarily through valves, the pump can operate at a speed more closely matched to the required process condition.

This can provide:

• Better flow control
• Reduced unnecessary operation
• Smoother starting
• Reduced mechanical shock
• Flexible process operation

The exact energy benefit depends on the pump curve, system curve and operating profile.

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25. Advantages for Fan Applications

Large fans often have variable airflow requirements.

A variable frequency drive allows the fan motor to operate at different speeds.

This can provide:

• Adjustable airflow
• Controlled startup
• Better process matching
• Reduced unnecessary operation
• Flexible ventilation control

This is one reason large industrial fans are frequently considered for variable-speed drive applications.

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26. Advantages for Conveyor Applications

For conveyors, the main advantage is often controlled motion rather than energy reduction.

The drive can provide gradual acceleration.

This can reduce sudden torque changes in:

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

For long conveyors, controlled acceleration can be particularly important.

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27. Related Models — Same Series

The following models are useful for comparison within the same PowerFlex 755 family.

The first model is a lower-current alternative.

The third, fourth and fifth models are useful when the motor requires greater current capacity.

For an actual replacement, the complete catalog number and duty requirements should be matched rather than assuming that a higher-current model is automatically interchangeable.

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28. Same-Series Comparison

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29. Five Related Models from the Same Product Family

These alternatives cover different voltage and current requirements.

The 400 VAC models are the most closely related to the target model.

The 480 VAC and 690 VAC configurations become relevant when the plant electrical system uses those voltage classes.

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30. Five Popular Models from the Same Brand

These models represent useful comparison points for high-power industrial applications.

The 400 VAC versions are the closest alternatives to the target model, while the 690 VAC models are more appropriate for high-voltage, high-power motor systems.

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31. Application Comparison

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32. Installation Requirements

Because the model is a large Frame 9 drive, installation planning should be done before equipment delivery.

The following factors should be considered:

Electrical Room Space

The cabinet is approximately 800 mm deep, and additional front and service clearance must be provided.

Cable Routing

The large motor current requires appropriately sized power conductors and suitable cable routing.

Grounding

The drive, motor and associated equipment should be integrated into the plant grounding system correctly.

Ventilation

Forced-air cooling requires sufficient air movement.

Temperature

Excessive ambient temperature can reduce thermal performance.

Dust

Dust accumulation on cooling equipment should be controlled.

Lifting

The final equipment weight in kg should be used for lifting equipment selection.

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33. Maintenance Recommendations

A high-power drive should not be maintained only after a failure occurs.

Preventive inspection is particularly valuable in environments where dust, heat or continuous operation can place additional stress on cooling components.

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34. Engineering Selection Guide

The following selection sequence is practical for this type of drive.

Step 1 — Confirm motor voltage.

The target configuration is intended for the 400 VAC class.

Step 2 — Confirm motor current.

The motor’s rated current must be within the applicable drive rating.

Step 3 — Determine duty.

Decide whether the application is normal duty or heavy duty.

Step 4 — Analyze the load.

A centrifugal pump behaves differently from a conveyor, compressor or crusher.

Step 5 — Check acceleration and deceleration.

High-inertia machinery may require special consideration.

Step 6 — Check braking requirements.

This configuration has no dynamic braking.

Step 7 — Check installation space.

The Frame 9, 800 mm deep cabinet requires substantial floor space.

Step 8 — Check cooling.

Ensure sufficient airflow and suitable ambient conditions.

Step 9 — Check control architecture.

Determine how the drive will communicate with the plant automation system.

Step 10 — Confirm mechanical data.

Use the final configuration for exact height, width and weight in kg.

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35. Product Advantages Summary

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36. Technical Summary

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37. Overall Product Assessment

The 20G11LC1K1JN0NNNNN is a high-power industrial variable frequency drive intended for large AC motor applications.

Its main strength is the combination of a 1090 A current rating, 400 VAC three-phase operation, Frame 9 construction, 630 kW normal-duty capacity, 500 kW heavy-duty capacity, forced-air cooling and an 800 mm deep MCC-style enclosure.

This makes it appropriate for industrial installations where motor power is measured in the hundreds of kilowatts and where a centralized drive solution is preferred.

The model is particularly well suited to large pumps, cooling-water systems, industrial fans, blowers, conveyors, compressors, mining machinery, cement equipment and other large rotating machines.

For pump and fan applications, the ability to vary motor speed can provide better process matching and more flexible operation.

For conveyors and other mechanical systems, controlled acceleration can reduce mechanical shock and provide smoother startup.

For large process systems, integration with an industrial control network allows the drive to become part of a centralized automation structure.

The 800 mm cabinet depth should be considered carefully during plant layout.

Because the exact mechanical configuration can affect width, height and total weight, the final installation documentation should be used whenever exact dimensions or weight in kg are required.

From an engineering standpoint, the most important selection criteria are not simply the motor’s nominal power.

The motor voltage, rated current, duty classification, overload requirement, load characteristics, acceleration requirements, braking requirements, environmental conditions, cooling requirements and available installation space should all be evaluated.

For a 400 VAC motor around the upper hundreds-of-kilowatts range, the 20G11LC1K1JN0NNNNN provides a high-capacity solution within the PowerFlex 755 family.

For a motor requiring slightly less current, the 20G11LC1K0JN0NNNNN can be considered.

For motors requiring greater current, the 20G11LC1K2JN0NNNNN, 20G11LC1K4JN0NNNNN or 20G11LC1K5JN0NNNNN can be considered as higher-capacity alternatives.

Where the plant uses 480 VAC or 690 VAC, the corresponding higher-voltage configurations should be evaluated instead of attempting to substitute a 400 VAC model directly.

Overall, the 20G11LC1K1JN0NNNNN is a large-frame, high-current industrial AC drive intended for serious motor-control applications where high power, robust construction, variable-speed control and integration with an industrial automation system are important requirements.