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20G11LD1K4JN0NNNNN — Detailed Product Information, Technical Parameters, Applications, Advantages and Related Models

1. Product Overview

The 20G11LD1K4JN0NNNNN is a high-power air-cooled AC drive in the PowerFlex 755 series.

It is designed for large three-phase AC motor applications where the motor requires very high current capacity, controlled acceleration and deceleration, adjustable speed, and integration into an industrial automation system.

This model is a 480 VAC, 3-phase, 1420 A, Frame 9 packaged drive configuration. It is intended for large industrial installations rather than compact machine applications.

The drive is particularly suitable for large conveyors, pumps, fans, blowers, mining equipment, material-handling systems, process machinery and other applications involving large AC motors.

The basic electrical rating is approximately 1350 HP for Light Duty, 1250 HP for Normal Duty and 1000 HP for Heavy Duty.

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2. Brand and Series

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3. Main Technical Parameters

The height, width and weight should be treated as engineering planning values rather than certified shipping dimensions. Large packaged-drive assemblies can vary according to cabinet arrangement, options, power-section construction and transportation configuration.

For a replacement or installation project, the final mechanical drawing and equipment nameplate should be used to confirm the exact dimensions and shipping weight.

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4. What the 20G11LD1K4JN0NNNNN Is

The 20G11LD1K4JN0NNNNN is essentially a large industrial variable-frequency AC drive.

Its job is to control the electrical power delivered to a large AC motor.

Instead of connecting the motor directly to a fixed-frequency electrical supply and allowing it to operate at approximately one fixed speed, the drive electronically controls the motor’s operating frequency and voltage.

A simplified operating path is:

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

The drive can therefore become an important part of the machine’s speed-control and process-control system.

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5. Electrical Capacity

The most important specification of this model is its 1420 A output-current rating.

This places the drive in the very high-power industrial category.

Its approximate duty ratings are:

The different horsepower ratings are associated with different duty requirements.

A motor application should therefore not be selected only from the horsepower value.

The motor’s actual nameplate current, overload requirement, operating profile and load type are equally important.

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6. Light-Duty Rating

The Light-Duty rating is approximately 1350 HP.

Light-Duty operation is generally associated with applications where the load does not require the same level of overload capability as a heavy mechanical application.

Examples can include:

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

The exact suitability depends on the motor nameplate current and operating conditions.

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7. Normal-Duty Rating

The Normal-Duty rating is approximately 1250 HP.

This rating is suitable for many large industrial applications where the drive operates continuously or for long periods.

Typical applications include:

• Large process pumps
• Industrial fans
• Large blowers
• Conveyors
• Material-handling equipment
• Process machinery

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8. Heavy-Duty Rating

The Heavy-Duty rating is approximately 1000 HP.

Heavy-Duty applications normally involve more demanding torque requirements, higher starting loads or more severe overload conditions.

Examples include:

• Heavy conveyors
• Mining machinery
• High-inertia machines
• Material-handling equipment
• Large mechanical processing machines

For these applications, the motor full-load current and overload profile should be checked carefully before selecting the drive.

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9. Product Construction

The 20G11LD1K4JN0NNNNN is a large-frame, air-cooled packaged drive.

Its physical construction is very different from small wall-mounted variable frequency drives.

The drive is designed as a substantial industrial electrical assembly with:

• Power semiconductor components
• DC bus section
• Input section
• Inverter section
• Cooling system
• Control electronics
• Protection functions
• Industrial communication capability
• Large power terminals
• Cabinet-mounted components

Because of its size and power level, the installation should be planned as a complete electrical-system project.

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10. Air-Cooled Design

The drive uses forced-air cooling.

During operation, the power electronics generate heat.

The cooling system moves air through the power section to transfer heat away from the internal components.

For this reason, the installation environment is important.

The following factors should be considered:

A large drive should not be installed where airflow is restricted.

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11. Type 1 / IP20 Construction

The specified configuration uses a Type 1 / IP20 style enclosure arrangement.

This means the drive should be installed in an appropriate controlled industrial environment.

It should not be treated as a weatherproof outdoor drive.

For applications involving:

• Heavy dust
• Water spray
• High humidity
• Corrosive chemicals
• Outdoor exposure
• Aggressive industrial contaminants

additional environmental protection may be necessary.

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12. Cabinet Dimensions

The cabinet depth is an important characteristic of this configuration.

The actual cabinet arrangement should always be checked before construction of an electrical room or control cabinet area.

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13. Weight

The 20G11LD1K4JN0NNNNN is a very heavy industrial drive.

For preliminary planning, a weight in the range of approximately:

1400–1500 kg

can be used.

A convenient preliminary engineering value is:

Approximately 1450 kg

The actual shipping weight can differ from the installed equipment weight.

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14. Typical Applications

14.1 Mining Conveyors

Large mining conveyors often require extremely high motor power.

The 20G11LD1K4JN0NNNNN can be considered for applications such as:

• Ore conveyors
• Coal conveyors
• Aggregate conveyors
• Long belt conveyors
• Material transfer conveyors
• Bulk-material systems

A variable-frequency drive can provide controlled acceleration and deceleration.

This can reduce the sudden mechanical stress associated with direct motor starting.

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15. Large Belt Conveyor Systems

A large conveyor may contain:

• Long belts
• Large drive pulleys
• Gearboxes
• Couplings
• Large amounts of material
• Significant mechanical inertia

Starting such a system abruptly can produce substantial mechanical stress.

The drive allows the acceleration profile to be controlled.

This can be useful for reducing stress on:

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

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16. Large Pump Applications

The drive can be used for large industrial pumping systems.

Typical examples include:

• Water transfer
• Cooling-water systems
• Industrial process water
• Mine dewatering
• Large circulation pumps
• Wastewater systems
• Pumping stations

Variable-speed operation allows pump output to be adjusted according to process demand.

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17. Large Fan Applications

Large fans are another important application area.

Examples include:

• Industrial ventilation
• Furnace fans
• Mine ventilation
• Exhaust systems
• Cooling systems
• Dust extraction
• Process ventilation

The drive can regulate motor speed instead of requiring the fan to run continuously at full speed.

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18. Large Blower Applications

The drive can also be used with large industrial blowers.

Potential applications include:

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

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19. Cement and Building-Material Equipment

Large cement and aggregate facilities contain many high-power motors.

Potential applications include:

• Large conveyors
• Raw-material handling
• Process fans
• Exhaust fans
• Blowers
• Material-transfer systems
• Large processing equipment

The drive’s high current capacity makes it appropriate for large motor systems.

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20. Port and Bulk-Material Handling

Large ports and bulk-material facilities often use powerful conveyor and material-handling systems.

Possible applications include:

• Bulk loading
• Bulk unloading
• Ship-loading equipment
• Conveyor systems
• Transfer equipment
• Storage-yard conveyors

The ability to control motor acceleration and speed can be useful in these systems.

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21. Advantages of the Product

21.1 Very High Current Capacity

The 1420 A output rating is one of the most significant advantages.

This makes the drive suitable for motor applications far beyond the range of compact industrial drives.

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21.2 High Motor Power

The drive can operate in approximately:

1350 HP Light Duty

1250 HP Normal Duty

1000 HP Heavy Duty

applications.

This makes it suitable for very large industrial machinery.

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21.3 Variable-Speed Operation

The motor can operate at different speeds according to process requirements.

This is useful when the machine does not need to operate continuously at full speed.

Applications that benefit particularly from speed control include:

• Pumps
• Fans
• Blowers
• Conveyors
• Process machines

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22. Controlled Acceleration

One of the practical advantages of a VFD is controlled motor acceleration.

Instead of immediately applying full operating speed, the drive can increase motor speed according to a programmed acceleration profile.

This can reduce mechanical shock.

Possible benefits include reduced stress on:

• Motor shafts
• Couplings
• Gearboxes
• Conveyor belts
• Bearings
• Mechanical structures

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23. Controlled Deceleration

The same principle applies during stopping.

The drive can control the motor’s reduction in speed.

This can make stopping smoother and more predictable.

For large rotating machinery, this can be especially useful because the machine may have substantial inertia.

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24. Process Control

The drive can form part of an automated process-control system.

A typical system can be represented as:

Process Controller → Speed Reference → Drive → Motor → Machine → Process Feedback

This arrangement allows motor speed to become part of the overall control strategy.

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25. Industrial Automation Integration

The PowerFlex 755 platform is designed for industrial automation environments.

The drive can exchange information with a control system, depending on the overall system configuration.

Typical information can include:

• Start command
• Stop command
• Speed reference
• Actual speed
• Current
• Status
• Fault condition
• Alarm condition
• Operating state

This makes the drive suitable for centralized industrial control.

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26. Energy Management Benefits

Variable-speed control can provide significant energy benefits in suitable applications.

This is particularly relevant to variable-torque loads such as:

• Centrifugal pumps
• Fans
• Blowers

When the process does not require full output, reducing motor speed can reduce power consumption.

However, the actual energy-saving result depends on the complete system.

Important factors include:

• Load curve
• Process demand
• Operating hours
• Motor efficiency
• Mechanical efficiency
• Pump or fan characteristics
• Required process output

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27. Maintenance Considerations

Large industrial drives require planned maintenance.

Preventive maintenance is particularly important in high-power installations because an unexpected shutdown can affect a large part of a production process.

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28. Installation Requirements

The approximate 1450 kg equipment weight should be considered before installation.

The installation area should have:

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

The transportation route should also be considered because a drive of this size may not be easily moved through standard doors or narrow industrial corridors.

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29. Electrical Installation Considerations

Before commissioning, engineers should verify:

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30. Five Closely Related Models

The following models are suitable for comparison because they are closely related PowerFlex 755 configurations in the same 480 VAC high-power family.

The models above are particularly useful when selecting a replacement or comparing different capacity levels.

The 1K2 model is a lower-current option.

The 1K3 model is slightly below the subject model.

The 1K4 models provide essentially the same main electrical capacity with different configuration options.

The 1K5 model provides additional current capacity for applications requiring more motor capacity.

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31. Same-Series Comparison

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32. Five Popular Models from the Same Brand

The following five models provide useful comparisons across different power ranges.

The first two models are compact drives and are therefore not direct electrical substitutes for the 20G11LD1K4JN0NNNNN.

They are included as examples of lower-power alternatives within the same broad product family.

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33. Compact Model — 25B-D2P3N114

This model is appropriate for a completely different motor-power range.

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34. Compact Model — 25B-D6P0N114

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35. Medium-Power Model — 20F11ND077JA0NNNNN

This type of drive becomes relevant where the motor requirement is substantially below the 1420 A range.

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36. Higher-Capacity Model — 20G11LD1K5JN0NNNNN

The 1K5 configuration provides a higher current capacity than the subject model.

This can be considered where the 1420 A capacity of the subject model is insufficient.

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37. Subject Model — 20G11LD1K4JN0NNNNN

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38. Recommended Application Matching

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39. Product Advantages Compared with Conventional Starters

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40. Why the 1420 A Rating Matters

The 1420 A rating is particularly important when dealing with very large motors.

A motor can have a high horsepower rating while also requiring substantial current.

The drive must therefore be capable of supplying the required current under the intended operating conditions.

For this reason, the following information should always be checked when selecting this drive:

Motor nameplate current

Motor voltage

Motor horsepower

Motor frequency

Load type

Overload requirement

Acceleration requirement

Deceleration requirement

Ambient conditions

The drive’s horsepower rating should not be used as the only selection criterion.

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41. Advantages in Conveyor Applications

For large conveyor systems, the product can provide:

• Smooth starting
• Controlled acceleration
• Controlled stopping
• Adjustable operating speed
• Reduced mechanical shock
• Better process coordination
• Easier integration with automated systems
• Improved control of material flow

For long conveyors, these characteristics can be particularly useful because the mechanical system may contain considerable inertia.

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42. Advantages in Pump Applications

For pumps, the main advantages can include:

• Adjustable flow
• Smooth motor starting
• Reduced starting shock
• Flexible process control
• Ability to match motor speed to process requirements
• Better integration with automatic control

For variable-torque pump systems, reduced-speed operation may also provide meaningful energy savings.

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43. Advantages in Fan Applications

For fans and blowers, the drive can provide:

• Adjustable airflow
• Smooth starting
• Variable operating speed
• Better process control
• Reduced unnecessary full-speed operation
• Automatic control integration

This can be particularly valuable in large ventilation systems.

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44. Advantages in Mining Applications

Mining environments often require robust motor-control equipment.

The 20G11LD1K4JN0NNNNN can be considered for:

• Large conveyors
• Material handling
• Mine ventilation
• Dewatering
• Processing equipment
• Bulk-material systems

Its high current capacity allows it to serve large motors that would be outside the range of compact drives.

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45. Advantages in Process Industries

For process industries, variable-speed motor control can improve the relationship between equipment output and actual process demand.

Instead of operating a motor continuously at full speed, the control system can adjust the drive according to the process.

This can improve:

• Process flexibility
• Operating control
• Production coordination
• Equipment starting behavior
• Motor-speed regulation

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46. Mechanical Planning Table

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47. Electrical Planning Table

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48. Maintenance Checklist

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49. Selection Checklist for Replacement

If this model is being purchased as a replacement for another large drive, the following information should be compared carefully.

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50. Overall Evaluation

The 20G11LD1K4JN0NNNNN is a very large industrial AC drive intended for applications where a standard compact variable-frequency drive would be completely inadequate.

Its main electrical characteristics are:

480 VAC

3 Phase

1420 A

1350 HP Light Duty

1250 HP Normal Duty

1000 HP Heavy Duty

Frame 9

Air Cooled

Type 1

IP20

800 mm cabinet depth

The product is especially well suited to large conveyors, mining equipment, industrial pumps, large fans, blowers, material-handling machinery and large process motors.

Its biggest strengths are the high current capability, large motor capacity, variable-speed control, controlled acceleration and deceleration, industrial automation compatibility and suitability for demanding continuous-duty applications.

From a mechanical perspective, it is a substantial piece of equipment. A preliminary planning dimension of approximately 2400–2500 mm high × 1000–1200 mm wide × 800 mm deep, together with a planning weight of approximately 1450 kg, should be considered when preparing an installation layout. These figures should be confirmed against the exact mechanical drawing before fabrication, transportation or foundation work.

For applications requiring slightly less capacity, 20G11LD1K3JN0NNNNN is a logical comparison.

For approximately the same electrical capacity with different configuration options, 20G11LD1K4JN2NNNNN and 20G11LD1K4JN4NNNNN are useful alternatives.

For applications requiring greater capacity, 20G11LD1K5JN0NNNNN provides a higher current class.

For medium-power applications, 20F11ND077JA0NNNNN is considerably smaller, while 25B-D2P3N114 and 25B-D6P0N114 represent compact-drive options for much smaller motors.

Overall, the 20G11LD1K4JN0NNNNN can be regarded as a high-capacity, floor-standing industrial drive for large 480 VAC motor systems where motor speed, acceleration, deceleration and process control need to be managed electronically.