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20G11LD800AN4NNNNN – PowerFlex 755 AC Drive Detailed Product Introduction and Technical Specification

The 20G11LD800AN4NNNNN is a high-power air-cooled AC drive designed for large industrial motor-control applications. It belongs to the PowerFlex 755 product family and is intended for demanding applications where large motors, high output current, controlled acceleration, variable-speed operation and reliable process control are required.

The model is built around a 480 VAC, three-phase, 800 A drive rating and uses a large Frame 9 floor-standing configuration. Its Type 1, IP20, 800 mm deep MCC-style construction makes it suitable for installation in a properly designed industrial electrical room or motor-control environment.

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1. Basic Product Information

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2. Product Introduction

The 20G11LD800AN4NNNNN is designed for controlling large three-phase AC motors in industrial environments.

Instead of connecting a large motor directly to a fixed-frequency power supply and allowing it to run at essentially one operating speed, the drive converts the incoming electrical power and produces a controlled output for the motor.

The basic operating principle can be represented as:

480 VAC Three-Phase Input → Drive Power Section → DC Bus → Inverter → Variable-Frequency AC Output → Motor

This allows the motor speed and operating characteristics to be adjusted according to the requirements of the machine.

For large motors, this method can provide much better control during starting, acceleration, normal operation and stopping.

The 800 A rating makes this model suitable for equipment well beyond the range of small or medium-size variable-frequency drives.

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3. Main Electrical Parameters

The 800 A output current is one of the most important characteristics of the model.

For motor selection, the actual motor nameplate current should always be compared with the applicable drive duty rating. Horsepower alone should not be used as the only sizing criterion.

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4. Power and Duty Ratings

The model is in the large-motor range and provides different reference capacities depending on the operating duty.

The difference between these ratings is important in practical applications.

A machine that has frequent overloads, high starting torque, rapid acceleration or high mechanical inertia may require a heavier-duty selection than a machine operating at a relatively constant load.

For example, a large conveyor with a heavily loaded belt can impose a considerably different demand on the drive than a large centrifugal fan.

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5. Mechanical Parameters

Dimensions and Weight

The 800 mm cabinet depth is an important identifying mechanical characteristic.

However, the complete overall height and width should not be guessed. A packaged drive of this size can have different physical arrangements depending on the selected options and cabinet configuration.

The same applies to the exact weight.

For a large floor-standing drive, the final weight can be important when planning:

• Transportation
• Forklift handling
• Crane lifting
• Foundation loading
• Electrical-room access
• Cabinet installation
• Maintenance procedures

Therefore, the correct engineering value should be taken from the mechanical drawing for the actual configured unit.

For this reason, the weight is listed as configuration dependent, kg rather than providing an invented number.

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6. Enclosure and Protection

The model uses a Type 1, IP20, 800 mm deep MCC-style enclosure.

This type of enclosure is intended primarily for controlled industrial indoor environments.

It should not be treated as a weatherproof enclosure.

The installation environment should be protected against:

• Direct water exposure
• Rain
• Condensation
• Excessive dust
• Corrosive materials
• Conductive contamination
• Excessive ambient temperature

For harsh environments, the surrounding electrical room or cabinet system should be designed accordingly.

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7. Cooling System

The 20G11LD800AN4NNNNN uses forced-air cooling.

At an output rating of 800 A, the amount of heat generated by the power electronics can be substantial.

Good airflow is therefore essential.

The installation should pay attention to:

• Cooling fan operation
• Air inlet and outlet paths
• Cabinet ventilation
• Electrical-room temperature
• Dust accumulation
• Heat generated by nearby equipment
• Required service clearance

If the cooling system becomes restricted, internal temperature can increase and the drive may experience thermal alarms or protective trips.

For continuous industrial operation, ventilation is not a minor detail. It is part of the overall drive installation.

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8. EMC Filtering

The AN4 configuration is associated with an EMC-filtered arrangement.

This is useful in installations where electromagnetic compatibility is an important design consideration.

A large variable-frequency drive generates high-frequency electrical components as part of its switching operation.

Proper filtering, grounding, cable routing and installation practices can help control unwanted electrical interference.

This can be particularly important in facilities containing:

• PLC systems
• Instrumentation
• Communication networks
• Sensors
• Measurement equipment
• Control systems
• Other sensitive electronic equipment

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9. Input Precharge

The drive uses an AC input with precharge.

Precharge is particularly important in a large high-power drive because the DC bus contains substantial energy-storage components.

When the drive is initially energized, the precharge system manages the charging process and helps prevent an uncontrolled inrush condition.

This is an important part of the overall architecture of a high-power AC drive.

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10. Dynamic Braking

The specified configuration does not include dynamic braking.

This does not mean the drive cannot be used with machines that decelerate.

It means that the particular catalog configuration does not include an integral dynamic-braking arrangement.

For applications with large rotating inertia, rapid stopping requirements or frequent deceleration cycles, the braking requirements should be reviewed during system design.

Typical applications requiring additional consideration include:

• Large conveyors
• Hoists
• Centrifuges
• High-inertia fans
• Large rollers
• Unwinders
• Winders
• Heavy rotating machinery

The required stopping method should be selected according to the actual mechanical system.

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11. Product Applications

The 20G11LD800AN4NNNNN is primarily suited to large industrial equipment.

Typical applications include:

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12. Conveyor Applications

Large conveyor systems are a natural application for a drive in this current range.

A heavily loaded conveyor can have significant inertia.

Starting the motor abruptly can result in high mechanical stress on:

• Gearboxes
• Couplings
• Drive shafts
• Bearings
• Conveyor belts
• Pulleys
• Mechanical structures

Using a variable-speed drive allows acceleration to be controlled.

The conveyor can be brought gradually up to operating speed rather than applying full torque immediately.

This can improve the mechanical behavior of the system and make the machine easier to integrate into an automated production process.

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13. Mining Applications

Mining equipment frequently requires very large motors.

The 800 A rating makes this drive appropriate for many high-power mining applications.

Potential uses include:

• Long conveyors
• Ore handling
• Material transfer
• Mine ventilation
• Dewatering systems
• Processing machinery
• Bulk-material handling
• Large fans
• Large pumps

Mining environments can be demanding, however.

The drive should normally be installed in a suitable controlled electrical environment where temperature, dust and moisture can be managed.

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14. Cement Plant Applications

Cement plants contain many large motors.

Potential applications include:

• Raw-material conveyors
• Cement conveyors
• Large fans
• Process blowers
• Large pumps
• Material-handling equipment
• Dust-collection systems
• Processing machinery

Variable-speed operation can help match motor output to actual process demand.

This can be particularly useful where production requirements change during the operating cycle.

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15. Aggregate and Quarry Applications

Aggregate plants use large motors for:

• Conveyors
• Crushers
• Screens
• Feeders
• Pumps
• Fans
• Material-handling equipment

A high-power drive can provide controlled starting and adjustable speed for equipment where mechanical shock is undesirable.

For crushing and conveying equipment, proper drive sizing should take starting torque and load inertia into account.

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16. Pump Applications

Large pumps can benefit significantly from variable-speed control.

Instead of continuously operating at full motor speed and controlling flow through a mechanical restriction, the drive can adjust motor speed to suit the process.

Possible benefits include:

• Adjustable flow
• Adjustable pressure
• Smooth acceleration
• Smooth stopping
• Reduced mechanical shock
• Better process control
• Potential energy savings

The greatest energy-saving opportunities are normally found when the pump operates under variable-flow conditions.

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17. Fan Applications

Large industrial fans often do not need to run at full speed continuously.

The drive can adjust the fan speed to match ventilation requirements.

Applications include:

• Mine ventilation
• Industrial ventilation
• Furnace systems
• Process exhaust
• Cooling systems
• Dust collection

Speed control can make the fan system more responsive to changing process requirements.

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18. Blower Applications

Industrial blowers can also use high-power variable-speed drives.

Potential applications include:

• Process-air systems
• Dust extraction
• Combustion-air systems
• Industrial ventilation
• Pneumatic systems
• Process gas circulation

Before selecting the drive, the engineer should determine the blower’s load characteristics and required operating range.

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19. Main Product Advantages

High 800 A Current Capacity

The biggest advantage of this model is its 800 A output capability.

This puts it firmly in the large industrial motor-control category.

It can therefore be considered for motors that would be far beyond the practical range of compact drives.

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Large Industrial Construction

The Frame 9 floor-standing construction is intended for substantial industrial installations.

This is fundamentally different from a small panel-mounted VFD.

The large cabinet provides space for high-power electrical components and the associated cooling arrangement.

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Controlled Motor Starting

Large motors can draw substantial current during starting.

A variable-frequency drive provides a controlled acceleration profile.

This can help reduce sudden mechanical loading.

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Variable-Speed Operation

The drive can control motor speed according to the machine requirement.

This is particularly useful for:

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

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Improved Process Control

A variable-speed motor can respond to changing process conditions.

For example, a pump can be operated at different speeds depending on pressure or flow requirements.

Similarly, a conveyor can be operated at different speeds depending on production requirements.

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Controlled Deceleration

The drive can control the motor’s deceleration instead of simply removing power and allowing the machine to coast.

This is valuable when the machine requires a predictable stopping sequence.

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20. Automation Applications

The PowerFlex 755 family is designed for use as part of an industrial automation system.

A typical arrangement is:

Controller → AC Drive → Motor → Machine → Process

The controller can manage functions such as:

• Start
• Stop
• Speed reference
• Direction
• Acceleration
• Deceleration
• Fault handling
• Status monitoring
• Process coordination

The drive therefore acts as both a power-conversion device and an important component of the machine-control system.

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21. Energy-Saving Potential

Variable-frequency control can reduce energy consumption when the motor load is suitable.

This is particularly relevant for:

• Centrifugal pumps
• Centrifugal fans
• Large ventilation systems
• Variable-flow applications

The actual energy savings depend on the machine, operating hours, load profile and process requirements.

It would not be appropriate to assume that every 800 A motor application automatically produces a large energy saving.

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22. Maintenance Considerations

Because this is a high-power industrial drive, preventive maintenance should be taken seriously.

A clean and properly ventilated electrical environment can significantly improve the operating reliability of high-power equipment.

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23. Installation Considerations

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24. Motor Selection

When pairing a motor with this drive, the following motor nameplate information should be checked.

The most important value is normally the motor’s actual full-load current rather than horsepower alone.

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25. Five Recommended Same-Series or Closely Related Models

The following models are useful when comparing the 800 A version with nearby PowerFlex 755 configurations.

Recommendation

If the motor current is close to 800 A, the 20G11LD800AN4NNNNN is the direct reference point.

If additional current margin is required, a higher-current configuration should be evaluated.

If the motor current is substantially lower, selecting a smaller drive can reduce cabinet size and overall system cost.

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26. Five Additional PowerFlex 755 Models Worth Comparing

The 20G11LD800AN4NNNNN is particularly suitable when the 800 A rating and its specific packaged configuration are required.

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27. Five Popular Models from the Same Brand

For broader comparison, the following models cover different power levels and applications.

These models illustrate the large difference between compact drives and the high-power Frame 9 configuration.

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28. Comparison by Application

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29. Product Advantages in Actual Industrial Use

The practical value of this model is not simply its 800 A rating.

The larger benefit is the ability to combine high-power motor control with adjustable speed and controlled operation.

For a large machine, this can make the entire process easier to manage.

For example, a conveyor can accelerate gradually, run at a controlled speed and stop according to a defined operating sequence.

A large pump can change speed according to process requirements.

A large fan can operate at reduced speed when full airflow is unnecessary.

A large industrial motor can therefore become part of a controlled process instead of simply being switched on and off.

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30. Important Selection Points

Before purchasing or replacing a drive with 20G11LD800AN4NNNNN, the following points should be checked.

1. Motor Current

The motor’s nameplate current should be compared with the drive’s applicable rating.

2. Duty Cycle

Determine whether the machine operates under:

• Light Duty
• Normal Duty
• Heavy Duty

3. Starting Torque

High starting torque may require careful drive sizing.

4. Acceleration Time

Large mechanical systems may need longer acceleration periods.

5. Deceleration

The required stopping time should be calculated.

6. Braking

Because the specified model does not include dynamic braking, the application should be evaluated for braking requirements.

7. Motor Cable

Cable size and installation method should be appropriate for an 800 A class drive system.

8. Cooling

The electrical room must provide adequate ventilation.

9. Physical Space

An 800 mm deep cabinet requires proper floor space and service access.

10. Lifting Weight

The exact equipment weight in kg must be confirmed before transportation and installation.

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31. Overall Technical Specification

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32. Short Product Description for Technical Catalog Use

20G11LD800AN4NNNNN is a PowerFlex 755 high-power air-cooled AC packaged drive designed for large three-phase motor applications. The drive operates from a 480 VAC supply and provides an 800 A output rating. It uses a Frame 9, Type 1, IP20, 800 mm deep MCC-style enclosure with forced-air cooling and an EMC-filtered configuration. The drive is suitable for large conveyors, pumps, fans, blowers, mining machinery, cement equipment, aggregate processing and other high-power industrial applications requiring controlled motor speed, acceleration and deceleration.

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33. Final Assessment

The 20G11LD800AN4NNNNN is a high-capacity industrial variable-frequency drive intended for applications where motor current and mechanical power requirements are substantial.

Its core specification can be summarized as:

480 VAC / 3 Phase / 800 A / Frame 9 / Air Cooled / Type 1 / IP20 / 800 mm Deep MCC Style / EMC Filtered / No Dynamic Braking.

The combination of 800 A output capacity and a large floor-standing construction makes it especially suitable for heavy industrial machinery.

For conveyors, pumps, fans and blowers, the principal benefit is controlled motor operation. The motor can be accelerated and decelerated according to the machine requirements instead of being subjected to a simple full-voltage start and uncontrolled stopping sequence.

For mining, cement, aggregate and heavy manufacturing environments, the large current capacity provides the electrical scale required by large motors.

The model is also a good reference point when comparing nearby PowerFlex 755 configurations. The 710 A, 740 A, 800 A, 825 A and 900 A ranges provide useful alternatives when the motor’s actual current requirement differs from 800 A.

One technical point deserves special attention: the exact overall dimensions and weight in kg should be taken from the mechanical configuration of the individual drive rather than estimated from the model number alone. The 800 mm cabinet depth is clear for this configuration, but the final height, width and equipment weight can depend on the packaged arrangement. For lifting, transportation, floor loading and installation planning, the actual mechanical drawing and nameplate information should always be used.

Overall, the 20G11LD800AN4NNNNN is best viewed as a large industrial motor-control solution for high-power applications rather than a general-purpose compact VFD. Its strongest advantages are its 800 A current capacity, large-motor capability, variable-speed control, controlled acceleration, industrial cabinet construction, forced-air cooling and suitability for integration into automated process-control systems.