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20G11LD1K4AN0NNNNN — Detailed Product Introduction, Technical Parameters, Applications, Advantages and Related Models

The 20G11LD1K4AN0NNNNN is a high-power air-cooled AC drive belonging to the PowerFlex 755 series. It is a large-frame industrial variable frequency drive intended for controlling high-power three-phase AC motors in demanding industrial environments.

The model is designed for the 480 VAC class, with a rated output current of approximately 1420 A. Its nominal power ratings are approximately 1350 HP for Light Duty, 1250 HP for Normal Duty, and 1000 HP for Heavy Duty.

This is a very large industrial drive. It is intended for applications such as large conveyors, pumps, fans, blowers, mining equipment, material-handling systems and other large process machines where precise motor-speed control and high output power are required.

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1. Basic Product Information

The dimensional and weight figures above should be regarded as preliminary engineering values. The exact cabinet configuration, accessories, shipping arrangement and installation options can affect the final physical dimensions and weight.

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2. Brand

The product belongs to the Allen-Bradley brand.

Allen-Bradley products are widely used in industrial automation, motor control, process control and manufacturing systems.

For this particular product, the most important identification is the PowerFlex 755 series designation.

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3. Product Series

The 20G11LD1K4AN0NNNNN belongs to the:

PowerFlex 755 Series

The PowerFlex 755 series is designed for demanding industrial AC motor-control applications.

Compared with compact variable frequency drives, this series provides a much broader range of motor-control functions and is available in substantially higher power ratings.

The subject model is one of the large-frame configurations, with a 1420 A output-current class.

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4. Product Type

The product can be described as:

High-Power Air-Cooled AC Variable Frequency Drive

It is used to convert fixed-frequency incoming AC power into controlled variable-frequency output power for an AC motor.

A simplified power path is:

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

The drive regulates motor speed and operating characteristics by controlling the electrical output supplied to the motor.

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5. Main Electrical Parameters

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6. Power Rating

The model provides different power ratings according to the required operating duty.

These ratings should not be interpreted as three different output-current ratings.

The 1420 A value is the key drive-current class, while the horsepower rating changes according to the applicable duty and overload requirements.

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7. Light-Duty Operation

The Light-Duty rating is approximately 1350 HP.

This rating is appropriate for applications where the motor load is relatively moderate and the required overload performance is less demanding.

Typical examples may include:

• Large centrifugal pumps
• Large fans
• Large blowers
• Variable-torque equipment
• Large ventilation systems

For final selection, the motor nameplate current remains more important than horsepower alone.

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8. Normal-Duty Operation

The Normal-Duty rating is approximately 1250 HP.

This is suitable for many large industrial machines operating continuously or for extended periods.

Typical applications include:

• Process pumps
• Large fans
• Material handling
• Industrial blowers
• Large conveyors
• General process machinery

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9. Heavy-Duty Operation

The Heavy-Duty rating is approximately 1000 HP.

Heavy-duty applications can place greater thermal and electrical demands on the drive.

Typical examples include:

• Heavy conveyors
• High-inertia machinery
• Material-handling equipment
• Machinery requiring substantial starting torque
• Heavy process equipment

For these applications, drive selection should be based on the actual motor current and overload profile.

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10. Mechanical Dimensions

The 20G11LD1K4AN0NNNNN is a large Frame 9 drive and should be treated as floor-standing industrial equipment.

The 800 mm depth is an important consideration when planning the electrical-room layout.

The cabinet should have sufficient space for incoming cables, motor cables, ventilation and service access.

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11. Weight

The product is a very heavy industrial electrical assembly.

For preliminary project planning, a reasonable reference range is:

Approximately 1400–1500 kg

A practical planning value is approximately:

1450 kg

The final shipping weight should be verified against the exact equipment configuration before transportation or foundation design.

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12. Product Introduction

The 20G11LD1K4AN0NNNNN is designed for large industrial motor applications where fixed-speed motor operation is not sufficient.

A conventional starter generally provides basic starting and stopping.

A variable frequency drive provides much more control.

The motor can be started progressively, operated at different speeds and brought to a stop according to the process requirements.

This makes the drive particularly useful for large mechanical systems where sudden motor acceleration could create excessive mechanical stress.

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13. High-Current Capability

The most distinctive characteristic of the 20G11LD1K4AN0NNNNN is its 1420 A output-current class.

This is a very high current rating.

It allows the drive to control motors that can consume hundreds of kilowatts under normal industrial operating conditions.

The high current rating makes the product suitable for:

• Large conveyors
• Mining machinery
• Large pumps
• Large fans
• Blowers
• Material-handling equipment
• Process machinery

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14. Air-Cooled Construction

The drive uses forced-air cooling.

Large power semiconductor components generate substantial heat during operation.

The cooling system removes heat from the power section and keeps the internal components within their required operating temperature range.

For this reason, ventilation is a major consideration during installation.

Important factors include:

• Ambient temperature
• Airflow
• Fan operation
• Cabinet cleanliness
• Dust accumulation
• Air inlet condition
• Exhaust path

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15. Type 1 / IP20 Construction

The specified configuration uses a Type 1, IP20 enclosure arrangement.

This is intended for installation in a suitable industrial environment where the equipment is protected from conditions outside its enclosure rating.

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

If the installation environment contains large amounts of dust, moisture, corrosive material or other contaminants, the overall electrical-room and enclosure design should provide the necessary environmental protection.

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16. Embedded Industrial Communication

This configuration is associated with an industrial automation-oriented PowerFlex 755 architecture.

Communication capability allows the drive to become part of a larger control system.

A typical arrangement can be represented as:

PLC / Controller → Industrial Network → PowerFlex Drive → Motor

This allows the drive to receive commands and provide operating information to the automation system.

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17. Typical Control Functions

Depending on the complete control configuration, the drive can be used for functions such as:

• Start
• Stop
• Speed reference
• Motor direction
• Acceleration control
• Deceleration control
• Fault reset
• Status monitoring
• Alarm monitoring
• Motor-current monitoring
• Speed feedback

This makes it suitable for automated production environments.

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18. Product Applications

18.1 Large Conveyor Systems

Large conveyors are one of the strongest application areas for a drive of this size.

Potential applications include:

• Mining conveyors
• Ore conveyors
• Coal conveyors
• Aggregate conveyors
• Cement conveyors
• Bulk-material conveyors
• Port conveyors
• Long-distance conveyors

Large conveyors can contain substantial mechanical inertia.

When a conveyor is started, the motor must accelerate not only the drive components but also the belt and transported material.

Controlled acceleration can therefore be very useful.

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19. Mining Industry

Mining equipment often uses extremely large motors.

Potential applications include:

• Ore handling
• Coal handling
• Large conveyors
• Dewatering systems
• Mine ventilation
• Processing equipment
• Material transfer systems

The high-current capacity of the drive makes it appropriate for large mining installations.

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20. Cement Industry

Large cement plants contain many high-power motors.

Possible applications include:

• Raw-material handling
• Large fans
• Process blowers
• Conveyors
• Material transfer
• Cooling equipment
• Ventilation systems

The ability to adjust motor speed can help coordinate motor operation with process demand.

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21. Large Pump Systems

The drive can be used for large industrial pump applications.

Typical examples include:

• Water transfer
• Industrial process water
• Mine dewatering
• Cooling-water systems
• Wastewater systems
• Large pumping stations
• Circulation systems

Variable-speed control allows the motor to operate at a speed appropriate to the required process condition.

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22. Large Fan Systems

Large fans are frequently used in industrial ventilation and process systems.

Potential applications include:

• Furnace fans
• Exhaust fans
• Mine ventilation
• Cooling fans
• Dust extraction
• Process ventilation
• Large air-handling systems

The drive can regulate fan speed according to airflow requirements.

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23. Large Blowers

The product can also be considered for large blower systems.

Examples include:

• Process air
• Combustion air
• Industrial ventilation
• Furnace systems
• Dust collection
• Process gas handling

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24. Material-Handling Systems

Large material-handling machines can require very high motor power.

Potential applications include:

• Belt conveyors
• Bulk-material handling
• Loading systems
• Unloading systems
• Transfer equipment
• Processing machinery

The drive provides controlled motor operation rather than simple fixed-speed starting.

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25. Advantages of the Product

25.1 Very High Current Rating

The 1420 A output-current capability is the main advantage.

It allows this drive to operate in applications where smaller VFDs cannot provide sufficient current.

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25.2 Large Motor Capacity

The drive can handle approximately:

1350 HP Light Duty

1250 HP Normal Duty

1000 HP Heavy Duty

This places it firmly in the high-power industrial category.

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25.3 Controlled Acceleration

The drive can gradually increase motor speed.

This can reduce sudden mechanical loading on:

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

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25.4 Controlled Deceleration

Controlled deceleration can be useful when a large machine needs to stop smoothly.

It can reduce abrupt mechanical changes and make the machine easier to operate.

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25.5 Variable-Speed Operation

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

Speed can be adjusted to suit the process.

This is particularly useful for:

• Pumps
• Fans
• Blowers
• Conveyors
• Process equipment

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26. Advantages for Energy Management

For suitable variable-torque loads, operating the motor at reduced speed can substantially change the power demand of the machine.

This is particularly relevant to:

• Centrifugal pumps
• Fans
• Blowers

The actual energy-saving result depends on the load curve, system resistance, operating schedule and process requirements.

Therefore, energy savings should be evaluated from the actual application rather than assumed solely from the use of a VFD.

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27. Advantages for Process Control

A fixed-speed motor can make process adjustment difficult.

A variable-speed drive gives the control system another important process variable: motor speed.

For example:

Flow requirement → Controller → Drive speed reference → Motor speed → Pump output

This type of control can be useful in automated industrial processes.

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28. Advantages for Large Conveyor Control

For a large conveyor, the drive can provide a controlled acceleration profile.

This can help reduce:

• Belt shock
• Gearbox shock
• Coupling stress
• Shaft torque fluctuations
• Starting disturbance

It can also provide better coordination between the conveyor and upstream or downstream equipment.

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29. Advantages for Pump Control

For pump applications, the drive can provide:

• Smooth starting
• Adjustable flow
• Reduced hydraulic shock
• Flexible process operation
• Better coordination with process controls

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30. Advantages for Fan Control

For large fans, variable-speed operation can allow airflow to be adjusted to the actual requirement.

Potential benefits include:

• Better airflow regulation
• Reduced unnecessary full-speed operation
• Smooth starting
• Improved process control
• Easier automation

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31. Maintenance Requirements

Large industrial drives require regular inspection.

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32. Installation Requirements

The approximate 1450 kg equipment weight should be considered during installation planning.

The installation team should evaluate:

• Floor strength
• Cabinet anchoring
• Lifting equipment
• Transportation route
• Cable entry
• Cable bending space
• Cooling airflow
• Front service clearance
• Electrical clearance
• Grounding

A suitable industrial foundation should be provided.

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33. Environmental Considerations

For mining and cement applications, environmental conditions should receive particular attention.

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34. Five Same-Series or Closely Related Models

The following models are useful for comparison because they belong to the same PowerFlex 755 high-power family or are closely related configurations.

The closest electrical alternatives are the other 1K4 configurations, because they maintain the same basic 1420 A / 480 VAC / Frame 9 class while changing configuration options.

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35. Detailed Comparison of Same-Series Models

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36. Five Popular Models from the Same Brand

The following models provide a broader range of comparison, from compact drives to very large industrial drives.

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37. Compact Model — 25B-D2P3N114

This model is designed for a much smaller motor range than the subject drive.

This is not a direct electrical replacement for the 20G11LD1K4AN0NNNNN.

It is included as a comparison to demonstrate the broad range of drive sizes available within the product portfolio.

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38. Compact Model — 25B-D6P0N114

The 25B-D6P0N114 provides more current capacity than the previous compact model while remaining physically much smaller than a Frame 9 drive.

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39. Medium Industrial Model — 20F11ND077JA0NNNNN

This model is in the PowerFlex 753 family and represents a substantially lower power range.

It can be considered when the motor current is significantly below the 1420 A requirement of the subject model.

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40. High-Power Model — 20G11LD1K3AN0NNNNN

This is one of the closest lower-capacity comparisons.

Compared with the subject model, it has a lower current rating and lower horsepower capacity.

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41. Subject Model — 20G11LD1K4AN0NNNNN

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42. Application Selection Table

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43. Comparison with Fixed-Speed Motor Starting

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44. Important Selection Considerations

Although the 20G11LD1K4AN0NNNNN has a 1350 HP Light-Duty rating, the drive should not be selected simply because the motor nameplate says 1350 HP.

The following information should be checked:

The motor’s actual full-load current should always be compared against the drive’s current rating.

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45. Maintenance Recommendations

For a drive of this size, maintenance should be planned rather than performed only after a fault occurs.

Regular inspection should include:

Cooling system: Verify fan operation and airflow.

Cabinet: Keep the interior clean and free from excessive dust.

Power connections: Inspect for signs of overheating or loose connections.

Motor cables: Inspect insulation and termination condition.

Grounding: Verify that grounding connections remain secure.

Control wiring: Inspect connectors and terminals.

Communication: Check for abnormal communication interruptions.

Fault history: Look for repeated faults that may indicate an underlying mechanical or electrical problem.

Temperature: Investigate abnormal temperature increases before they become major failures.

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46. Installation and Handling

The approximate 1450 kg equipment weight means that transportation and installation should be considered part of the engineering design.

The installation area should provide:

• Adequate floor strength
• Proper cabinet anchoring
• Suitable lifting access
• Sufficient front clearance
• Adequate ventilation
• Suitable cable-entry space
• Appropriate grounding
• Safe maintenance access

A drive of this size should not be installed in a location where access for maintenance is restricted.

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47. Mechanical Summary

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48. Electrical Summary

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49. Overall Product Advantages

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50. Final Product Assessment

The 20G11LD1K4AN0NNNNN is a very high-power PowerFlex 755 AC drive designed for large industrial motor applications.

Its most important characteristics are its 480 VAC input class, 1420 A output-current rating, 1350 HP Light-Duty capacity, 1250 HP Normal-Duty capacity and 1000 HP Heavy-Duty capacity.

The drive is particularly suitable for large conveyors, mining equipment, industrial pumps, fans, blowers, material-handling systems and other large process machines.

Its large Frame 9 construction, approximately 800 mm cabinet depth, forced-air cooling and approximately 1.4–1.5 tonne equipment weight mean that it should be planned as a major piece of electrical equipment rather than as a conventional compact VFD.

The most important practical advantages are its high current capability, large motor capacity, controlled acceleration and deceleration, adjustable motor speed, and ability to participate in an automated industrial control system.

For a slightly smaller capacity, 20G11LD1K3AN0NNNNN is a useful comparison.

For the same general electrical capacity with different configuration options, 20G11LD1K4AN2NNNNN, 20G11LD1K4AN4NNNNN, 20G11LD1K4JN0NNNNN, and 20G11LD1K4JN2NNNNN are closely related models.

For a smaller industrial installation, the PowerFlex 753 range can be considered, while the PowerFlex 525 range is more appropriate for compact, lower-power machinery.

One final point is important for replacement projects: this particular 20G11LD1K4AN0NNNNN configuration has been discontinued, so a replacement should be evaluated by motor current, duty rating, voltage, installed options, control architecture, cabinet dimensions, cooling arrangement and mechanical installation requirements, rather than by horsepower alone.