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1. Product Overview

The 20G11LD1K3AN0NNNNN is a large-frame, air-cooled AC variable frequency drive designed for high-power industrial motor applications.

It belongs to the PowerFlex 755 drive family and is intended for applications requiring substantially higher motor power than compact or standard wall-mounted drives can provide.

The drive is rated for the 480 VAC class and has a continuous output-current rating of approximately 1365 A. Its published power ratings are approximately 1250 HP for Light Duty, 1100 HP for Normal Duty, and 900 HP for Heavy Duty.

The product uses a large Frame 9 construction and an approximately 800 mm-deep MCC-style enclosure. It is therefore intended primarily for large industrial electrical rooms, motor-control areas and process installations rather than small machine panels.

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2. Basic Product Information

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3. Brand and Product Series

The PowerFlex 755 series is designed for industrial applications where motor speed, torque, acceleration, deceleration and process control need to be managed electronically.

The 20G11LD1K3AN0NNNNN is positioned toward the high-power end of this product family.

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4. Main Electrical Parameters

The distinction between Light Duty, Normal Duty and Heavy Duty is important when selecting the drive for a motor.

A motor’s horsepower alone should not be used as the only selection criterion. Motor full-load current, overload requirements, duty cycle and actual load characteristics should also be considered.

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5. Light-Duty, Normal-Duty and Heavy-Duty Ratings

One of the most useful characteristics of this model is that its capacity is expressed according to different operating-duty requirements.

Light Duty

Light-duty applications generally have comparatively moderate overload requirements.

The drive can support a motor application in the approximately 1250 HP class under the applicable light-duty conditions.

Typical examples can include variable-torque applications where the motor load changes according to process requirements.

Normal Duty

For normal industrial operation, the approximate rating is 1100 HP.

This is useful for large industrial machinery that operates continuously but does not require the same overload capability as a severe heavy-duty application.

Heavy Duty

For demanding applications with greater torque requirements, the approximate rating is 900 HP.

Heavy-duty selection is particularly relevant for machinery such as conveyors and other loads where starting and acceleration can impose substantial torque requirements.

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6. Mechanical Parameters

The 20G11LD1K3AN0NNNNN is a large industrial drive and requires considerably more installation space than compact VFDs.

Because this is a large-frame industrial drive, the actual cabinet arrangement should be checked before designing the foundation, cable route, lifting arrangement or electrical room layout.

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7. Weight

The approximate weight of this large Frame 9 configuration can be considered in the 1,300–1,500 kg range for preliminary planning.

A practical engineering planning value is approximately:

1,400 kg

The final shipping weight may be different depending on cabinet configuration, options and packaging.

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8. Product Introduction

The 20G11LD1K3AN0NNNNN is intended to control large three-phase AC motors by regulating the frequency and voltage supplied to the motor.

Instead of operating a motor at a fixed electrical frequency, the drive can vary motor operating speed according to the requirements of the machine.

This is especially useful for large industrial systems where direct-on-line starting would cause excessive starting current or mechanical shock.

The large output-current capacity of 1365 A places this model in a high-power industrial category.

It can be used for motors in applications such as large conveyors, pumps, fans, blowers, material-handling systems, mining equipment and other process machinery.

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9. How the Drive Works

A simplified operating sequence can be described as:

Three-Phase AC Input → Rectification → DC Bus → Inverter → Variable-Frequency AC Output → Motor

The drive receives electrical power from the incoming AC supply.

The incoming AC is converted into a DC bus voltage.

The inverter section then generates a controlled AC output for the motor.

By changing the output frequency and voltage, the drive can control motor speed and operating behavior.

This makes the drive considerably more flexible than a conventional motor starter.

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10. Main Product Advantages

10.1 Very High Output Current

The biggest advantage of the 20G11LD1K3AN0NNNNN is its 1365 A output-current rating.

This allows it to control very large industrial motors.

The high current rating makes it appropriate for applications where a conventional small or medium-size VFD would be insufficient.

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10.2 Large Motor Capacity

The drive provides approximately:

• 1250 HP Light Duty
• 1100 HP Normal Duty
• 900 HP Heavy Duty

This makes it suitable for large process equipment and heavy industrial machinery.

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10.3 Variable-Speed Control

The drive allows motor speed to be adjusted rather than keeping the motor permanently at a fixed speed.

This is valuable for:

• Pumps
• Fans
• Conveyors
• Blowers
• Material-handling systems
• Process equipment

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10.4 Controlled Motor Starting

Large motors can produce substantial starting current when connected directly to the power supply.

Using a variable frequency drive allows the motor to accelerate progressively.

This can reduce mechanical shock during startup.

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10.5 Reduced Mechanical Stress

Controlled acceleration can reduce stress on:

• Shafts
• Couplings
• Gearboxes
• Bearings
• Belts
• Conveyor structures
• Pump systems

This is particularly valuable for large mechanical systems with high inertia.

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11. Product Applications

11.1 Mining Conveyors

Large mining conveyors are one of the most appropriate application areas for a drive of this capacity.

Typical applications include:

• Ore conveyors
• Coal conveyors
• Overland conveyors
• Transfer conveyors
• Aggregate conveyors
• Bulk-material handling systems

A conveyor can contain a very large quantity of material.

The motor therefore needs to overcome substantial inertia during acceleration.

A high-power variable frequency drive can provide a controlled acceleration profile.

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12. Cement Plants

Cement production facilities use many large motors.

Possible applications include:

• Raw-material handling
• Large fans
• Material conveyors
• Process blowers
• Cooling systems
• Exhaust systems
• Material-processing machinery

The drive can be used where a large motor requires adjustable speed and controlled acceleration.

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13. Steel Processing

Large motors are commonly used throughout steel-processing facilities.

Potential applications include:

• Large fans
• Cooling-water pumps
• Material handling
• Process machinery
• Large conveyors
• Auxiliary equipment

The high-current capability of the drive makes it appropriate for large industrial motor loads.

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14. Large Pump Stations

The 20G11LD1K3AN0NNNNN can also be considered for large pump systems.

Potential applications include:

• Water transfer
• Industrial water circulation
• Mine dewatering
• Cooling-water systems
• Process-water pumping
• Wastewater systems

Variable-speed control allows the pump to operate according to process demand rather than remaining at maximum speed at all times.

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15. Large Fan Systems

Large fans can require hundreds of kilowatts of motor power.

Typical applications include:

• Furnace ventilation
• Industrial exhaust
• Mine ventilation
• Process ventilation
• Cooling systems
• Dust extraction
• Air-handling equipment

A variable frequency drive allows fan speed to follow airflow requirements.

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16. Blower Applications

Large blowers are another possible application.

Examples include:

• Industrial process air
• Combustion air
• Furnace systems
• Dust collection
• Process ventilation
• Air circulation

For variable-torque loads such as fans and blowers, adjustable speed can provide useful process flexibility.

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17. Material-Handling Equipment

Large material-handling systems often require high motor power.

Applications can include:

• Conveyors
• Crushers
• Transfer systems
• Bulk-material equipment
• Loading systems
• Unloading systems
• Processing equipment

The drive can provide controlled acceleration and adjustable operating speed.

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18. Advantages in Conveyor Applications

A large conveyor can be mechanically complex.

When a motor starts, torque passes through the motor shaft, coupling, gearbox and conveyor structure.

A sudden application of full torque can create mechanical shock.

Variable-speed control allows acceleration to be adjusted.

This can help improve:

• Startup smoothness
• Belt behavior
• Mechanical stress
• Process control
• Operator control

For long conveyors, controlled acceleration can be especially valuable.

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19. Advantages in Pump Applications

Pump systems frequently operate at different process loads.

The drive can allow the motor speed to be adjusted to match the required pumping condition.

Potential benefits include:

• Improved flow control
• Smooth startup
• Reduced hydraulic shock
• Flexible operating speed
• Better process adjustment

Actual energy savings depend on the pump system, piping arrangement and operating profile.

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20. Advantages in Fan Applications

Fans often operate according to airflow requirements.

If airflow requirements decrease, reducing motor speed can be an effective way of adjusting system output.

This makes a variable frequency drive particularly useful in:

• Ventilation
• Cooling
• Exhaust
• Dust collection
• Industrial air handling

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21. Automation Integration

The 20G11LD1K3AN0NNNNN can form part of an industrial automation system.

A typical architecture can be represented as:

Operator Interface → PLC → Industrial Network → Drive → Motor → Machine

The automation controller can issue commands such as:

• Start
• Stop
• Speed reference
• Direction
• Reset
• Process command

The drive can return information such as:

• Motor speed
• Output current
• Drive status
• Fault status
• Warning status
• Operating condition

This makes it suitable for centralized process-control systems.

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22. Maintenance Advantages

A large industrial drive benefits from structured preventive maintenance.

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23. Installation Considerations

Because the equipment is approximately 1,400 kg class, mechanical installation must be planned carefully.

Important considerations include:

• Floor loading
• Cabinet anchoring
• Lifting equipment
• Cable routing
• Cooling airflow
• Service clearance
• Electrical clearance
• Grounding
• Ambient temperature
• Dust control

The drive should be installed in a suitable industrial environment with adequate ventilation.

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24. Cooling Requirements

The product uses forced-air cooling.

High-power semiconductor devices generate considerable heat during operation.

Therefore, the cooling system is critical to reliable operation.

Important maintenance items include:

• Cooling fan condition
• Airflow
• Cabinet ventilation
• Dust accumulation
• Ambient temperature
• Air inlet condition
• Exhaust path

A blocked airflow path can cause excessive internal temperature.

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25. Environmental Considerations

For mining, cement and similar environments, environmental protection and maintenance planning are particularly important.

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26. Five Recommended Same-Series or Closely Related Models

The following models are useful alternatives or comparison points within the same high-power PowerFlex 755 family.

The closest electrical alternatives are the other 1K3 configurations because they retain the same approximately 1365 A capacity.

The 1K4 configuration is useful where additional motor-current capacity is required.

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27. Detailed Comparison of Related Models

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28. Five Popular Models from the Same Brand

For a broader comparison, the following models cover different power levels within the same product portfolio.

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29. Compact PowerFlex Comparison

25B-D2P3N114

This is a compact drive designed for a much smaller motor range.

It is not a direct electrical replacement for the 20G11LD1K3AN0NNNNN.

Its value is that it provides a compact solution when the motor power is much smaller.

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30. 25B-D6P0N114

This is another compact model.

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31. 20F11ND077JA0NNNNN

This model belongs to the PowerFlex 753 family and is aimed at a considerably lower power range.

This model is more appropriate when the motor current is significantly below the 1365 A requirement.

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32. 20G11LD1K2AN0NNNNN

This is one of the closest alternatives to the subject model.

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33. 20G11LD1K4AN0NNNNN

This is a higher-capacity comparison model.

This model is particularly useful when the motor current is higher than the 1365 A capacity of the subject model.

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34. Model Selection by Motor Size

The final selection should always be based on actual motor full-load current and required overload performance.

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35. Advantages Compared with a Fixed-Speed Starter

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36. Advantages in Heavy Industrial Equipment

The 20G11LD1K3AN0NNNNN is especially attractive where the motor represents a significant portion of the machine’s total power consumption.

A high-power drive can provide a central point for controlling the motor.

Instead of treating the motor as a simple on/off device, the drive becomes part of the machine’s control architecture.

This can improve operating flexibility and make the motor’s behavior easier to coordinate with the rest of the process.

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37. Important Engineering Points

When using this drive, the following points should be checked during project engineering:

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38. Overall Technical Summary

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39. Final Product Assessment

The 20G11LD1K3AN0NNNNN is a high-capacity industrial AC drive intended for very large motor applications.

Its 1365 A output-current rating, 1250 HP Light-Duty rating, 1100 HP Normal-Duty rating and 900 HP Heavy-Duty rating place it firmly in the large industrial-drive category.

Its strongest applications are large conveyors, mining equipment, pumps, fans, blowers, material-handling machinery and other high-power process equipment.

The Frame 9, 800 mm cabinet depth, forced-air cooling and large floor-standing construction make it suitable for dedicated industrial electrical installations rather than compact machine-control cabinets.

The main advantages are high motor capacity, adjustable speed, controlled acceleration and deceleration, integration into industrial automation systems, and suitability for large mechanical loads.

For a slightly lower current requirement, 20G11LD1K2AN0NNNNN is a useful comparison.

For the same 1365 A capacity with different configuration options, 20G11LD1K3AN2NNNNN, 20G11LD1K3JN0NNNNN, and 20G11LD1K3JN2NNNNN are closely related choices.

Where additional capacity is needed, 20G11LD1K4AN0NNNNN is a suitable higher-current comparison.

One important point for procurement and replacement planning is that this particular 20G11LD1K3AN0NNNNN catalog configuration has reached discontinued status, so an engineering replacement should not be selected by horsepower alone. The replacement should be checked against voltage, motor current, duty rating, enclosure, cooling arrangement, installed options, control requirements and mechanical dimensions.