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Allen-Bradley 20G1ALF500AN0NNNNN PowerFlex 755 AC Drive

1. Product Introduction

The Allen-Bradley 20G1ALF500AN0NNNNN is a high-power PowerFlex 755 AC variable-frequency drive designed for large three-phase industrial motors and demanding variable-speed applications.

This model is part of the high-power 690 VAC range and uses a Frame 8 configuration. It is rated at 500 A, with application ratings of approximately 530 kW for light duty, 500 kW for normal duty, and 400 kW for heavy duty. The drive is air cooled and configured for industrial MCC-style installation. 

The 20G1ALF500AN0NNNNN is intended for applications where a large motor must operate under controlled speed and torque rather than simply running at a fixed speed.

Typical applications include large water pumps, wastewater pumps, industrial fans, blowers, conveyors, mining equipment, cement machinery, process equipment, material-handling systems, and other large rotating machines.

The 500 A rating places this model above the 460 A configuration in the same 690 VAC Frame 8 family. It is therefore suitable for applications requiring additional current capacity while remaining within the same general high-power drive platform.

The drive uses forced-air cooling and is intended for a structured industrial installation. Its large physical size and approximately half-ton-class weight should be considered during electrical-room layout, transportation, lifting, floor-loading calculations, and maintenance planning.

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2. Brand and Product Series

Item	Specification
Brand	Allen-Bradley
Series	PowerFlex 755
Product Family	PowerFlex 750-Series
Product Type	High-Power AC Variable Frequency Drive
Model	20G1ALF500AN0NNNNN
Voltage Class	690 VAC
Input Phase	Three-phase
Rated Current	500 A
Frame	Frame 8
Cooling	Forced Air
Enclosure	IP20 / Type 1
Cabinet Style	800 mm Deep MCC Style
Communication	Embedded EtherNet/IP
Input Arrangement	AC Input with Precharge
DC Terminals	No DC Terminals
Filtering	Filtered
CM Jumper	Removed
Dynamic Braking	None
Human Interface	Blank / No HIM
Main Function	Variable-speed AC motor control

The PowerFlex 755 series is a high-performance industrial AC drive platform designed for applications requiring flexible motor control, high power capacity, automation-system integration, and adjustable speed operation.

The 20G1ALF500AN0NNNNN represents one of the larger 690 VAC configurations in the Frame 8 range.

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3. Complete Product Parameters

Parameter	Specification
Model	20G1ALF500AN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product Type	AC Variable Frequency Drive
Input Voltage	690 VAC
Input Phase	3 Phase
Rated Current	500 A
Light-Duty Rating	530 kW
Normal-Duty Rating	500 kW
Heavy-Duty Rating	400 kW
Frame Size	Frame 8
Cooling Method	Forced Air
Enclosure	IP20 / Type 1
Installation Style	800 mm Deep MCC Style
Input Type	AC Input with Precharge
DC Terminals	None
Communication	Embedded EtherNet/IP
Filtering	Filtered
CM Jumper	Removed
Dynamic Braking	None
HIM	Blank / No HIM
Motor Type	Three-Phase AC Motor
Approximate Height	2453 mm
Approximate Width	600 mm
Approximate Depth	800 mm
Approximate Weight	623 kg
Application Class	High-Power Industrial
Typical Applications	Pumps, fans, blowers, conveyors, compressors and process machinery

The exact catalog configuration identifies this model as a 500 A, 530 kW LD, 500 kW ND, 400 kW HD, 690 VAC, three-phase, Frame 8 PowerFlex 755 drive with air cooling, embedded EtherNet/IP, AC input with precharge, no DC terminals, filtered operation, CM jumper removed, no dynamic braking, and no HIM. 

The dimensions and weight shown above should be treated as engineering planning values for the Frame 8 MCC-style arrangement. The final mechanical drawing for the exact equipment configuration should be used for cabinet fabrication, lifting, transportation, floor loading, and installation work.

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4. Electrical Specifications

Electrical Parameter	Specification
Model	20G1ALF500AN0NNNNN
Nominal Input Voltage	690 VAC
Input Phase	Three-phase
Rated Current	500 A
Light-Duty Power	530 kW
Normal-Duty Power	500 kW
Heavy-Duty Power	400 kW
Input Type	AC with Precharge
Output	Variable-Frequency Three-Phase AC
Frame	8
Cooling	Forced Air
Dynamic Braking	None
Filtering	Filtered
CM Jumper	Removed
Communication	Embedded EtherNet/IP
Enclosure	IP20 / Type 1
Installation Style	MCC Style
DC Terminals	None

The 500 A current rating is the primary electrical characteristic of this model.

For large industrial motors, drive selection should be based on the motor full-load current, actual torque requirement, overload profile, operating speed range, acceleration characteristics, and environmental conditions rather than motor kW alone.

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5. Power Ratings

The three main power ratings are:

Duty Rating	Motor Power Rating
Light Duty (LD)	530 kW
Normal Duty (ND)	500 kW
Heavy Duty (HD)	400 kW

The 530 kW light-duty rating provides the highest motor-power range associated with this configuration.

The 500 kW normal-duty rating is appropriate for many general industrial variable-speed applications where the load is substantial but does not require the highest overload capability.

The 400 kW heavy-duty rating is important for applications with higher torque demand, heavier starting loads, more severe acceleration requirements, or higher overload requirements.

The correct duty classification should always be determined from the actual motor nameplate current and mechanical load profile.

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6. Understanding Light Duty, Normal Duty and Heavy Duty

The different duty ratings are not simply three different names for the same power rating.

They reflect different application conditions.

Light Duty

Light-duty applications generally have less demanding overload requirements and are suitable for loads where the drive does not need to provide high overload current for extended periods.

The 530 kW LD rating gives the drive its highest stated motor-power capability.

Typical applications can include large fans and centrifugal pumps with relatively stable load characteristics.

Normal Duty

The 500 kW ND rating provides a substantial continuous motor-power capability for general industrial equipment.

It is suitable for many variable-speed pumps, fans, blowers, conveyors, and process machines when the actual load profile remains within the normal-duty limits.

Heavy Duty

The 400 kW HD rating is intended for more demanding applications.

Examples can include heavy conveyors, higher-torque process equipment, machinery with demanding acceleration, and equipment with significant load variation.

The heavy-duty rating should be used when the application requires the higher overload performance associated with the heavy-duty class.

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7. Voltage Class

The 20G1ALF500AN0NNNNN is a 690 VAC three-phase drive.

The 690 VAC class is particularly useful in large industrial installations because higher motor voltage allows high power to be transmitted at a lower current than would be required at a lower motor voltage.

This becomes increasingly important as motor power increases.

For several-hundred-kilowatt motors, the reduction in current can affect cable selection, switchgear sizing, electrical distribution, cabinet arrangement, and overall plant infrastructure.

The 690 VAC class is therefore commonly associated with large industrial motors and major process equipment.

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8. Rated Current

The drive is rated at 500 A.

This high current capacity makes it suitable for large three-phase motors.

When selecting the drive, the motor’s actual full-load current should be compared against the drive rating.

The following factors should also be checked:

• Motor full-load current.
• Motor voltage.
• Motor rated frequency.
• Motor power.
• Required starting torque.
• Continuous load.
• Overload requirements.
• Acceleration time.
• Deceleration time.
• Minimum operating speed.
• Maximum operating speed.
• Motor inertia.
• Ambient temperature.
• Installation altitude.
• Cooling conditions.

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9. Dimensions and Weight

The physical size of this drive is an important part of the engineering design.

Mechanical Parameter	Approximate Value
Model	20G1ALF500AN0NNNNN
Frame	8
Height	2453 mm approx.
Width	600 mm approx.
Depth	800 mm
Weight	623 kg approx.
Enclosure	IP20 / Type 1
Cabinet Style	MCC Style
Cooling	Forced Air
Installation	Floor/Cabinet Installation
Equipment Class	Large Industrial Drive

The 2453 mm height means that installation-room clearance must be considered carefully.

The 600 mm width provides a relatively narrow footprint for a drive of this power class, but the overall depth and ventilation requirements must still be considered.

The 800 mm depth is especially important when planning the cabinet line-up.

At approximately 623 kg, the drive also requires suitable floor loading and lifting arrangements.

The values above should be regarded as planning dimensions rather than fabrication dimensions. Exact mechanical drawings should be checked before manufacturing an enclosure or mounting structure.

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10. Physical Installation

The 20G1ALF500AN0NNNNN is not a small wall-mounted VFD.

It is a large industrial Frame 8 drive intended for a properly designed electrical installation.

The installation area should provide enough room for:

• Incoming power connections.
• Motor output connections.
• Control wiring.
• Communication wiring.
• Ventilation.
• Inspection.
• Maintenance.
• Component replacement.
• Safe access.
• Equipment lifting.
• Cable routing.
• Heat dissipation.

The surrounding cabinet and electrical-room design should prevent hot air from recirculating into the drive cooling inlet.

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11. Cooling System

The drive uses forced-air cooling.

Large power semiconductor devices generate considerable heat when handling hundreds of amperes.

The cooling system removes this heat and transfers it into the surrounding environment.

For reliable operation, the cooling airflow must remain unobstructed.

The installation should therefore consider:

• Ambient temperature.
• Airflow direction.
• Ventilation capacity.
• Cabinet heat load.
• Dust concentration.
• Filter condition.
• Fan condition.
• Maintenance access.

If the drive is installed in a hot or contaminated environment, the overall thermal design becomes especially important.

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12. Enclosure and Protection

The specified configuration is an IP20 / Type 1, 800 mm deep MCC-style drive.

This type of installation is intended for a controlled industrial electrical environment.

It should not be treated as a weatherproof outdoor drive enclosure.

If the equipment is installed in a location with significant dust, moisture, corrosive gases, oil mist, or other contaminants, additional environmental protection may be required.

The complete installation should be designed as a system, including the surrounding cabinet, ventilation, cable entry, grounding, and environmental controls.

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13. AC Input with Precharge

The drive uses an AC input with precharge arrangement.

Large VFDs contain substantial DC-link capacitance.

When power is first applied, the DC-link capacitors must be charged in a controlled manner.

The precharge system helps manage this initial charging process and prevents an uncontrolled capacitor charging event.

The model is also specified with no DC terminals, making this configuration different from versions designed for certain common-DC or DC-bus applications.

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14. Filtering and CM Jumper

The requested model uses a filtered configuration with the CM jumper removed.

This configuration affects the common-mode electrical behavior of the drive system.

Correct grounding and cable installation remain important.

The motor cable should be selected and routed appropriately for a high-power variable-frequency drive.

Control and communication cables should be routed in a way that minimizes unnecessary coupling from the motor-power circuit.

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15. Dynamic Braking

The 20G1ALF500AN0NNNNN is specified with no dynamic braking.

This does not mean the drive cannot perform controlled deceleration.

The drive can decelerate a motor according to programmed control parameters.

However, when a high-inertia motor/load combination is decelerated rapidly, the mechanical system can return energy to the drive.

Applications with substantial regenerative energy should therefore be evaluated separately.

Examples include:

• Large high-inertia fans.
• Heavy conveyors.
• Centrifuges.
• Large rotating machinery.
• Rapid-cycle machines.
• Certain hoisting applications.

The braking method should be selected based on the actual inertia, deceleration time, speed, load profile, and required stopping performance.

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16. Human Interface Configuration

The catalog configuration specifies a blank / no HIM arrangement.

This configuration is suitable where the drive is intended to operate primarily under control of an automation system rather than through a permanently installed local operator interface.

Local control can instead be provided through the plant control architecture where appropriate.

This arrangement can also simplify the front appearance of a large MCC-style installation where the drive is part of a centralized control system.

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17. Embedded EtherNet/IP Communication

The 20G1ALF500AN0NNNNN includes embedded EtherNet/IP capability.

This provides a convenient way to integrate the drive into an industrial control network.

Typical network-based functions can include:

• Start commands.
• Stop commands.
• Speed references.
• Operating status.
• Output frequency.
• Output current.
• Fault information.
• Warning information.
• Drive state.
• Reference values.
• Process information.

In a large plant, several PowerFlex drives can be integrated into the same control architecture.

This can simplify centralized monitoring and reduce the amount of conventional point-to-point control wiring.

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18. Product Applications

The 20G1ALF500AN0NNNNN is designed for high-power industrial applications.

Typical application areas include:

Application	Typical Equipment
Water Treatment	Large pumps and blowers
Wastewater Treatment	Transfer pumps and aeration systems
Mining	Heavy conveyors, pumps and ventilation
Cement	Large fans, conveyors and process equipment
Steel Processing	Pumps, fans and material handling
Pulp and Paper	Process pumps and fans
Chemical Processing	Large process pumps and blowers
Manufacturing	Large production machinery
Material Handling	Heavy-duty conveyor systems
Industrial Ventilation	Large fans and blowers
Utilities	Auxiliary pumps and fans
General Process Industry	Large rotating machinery

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19. Pump Applications

Large pumps are a major application for this type of drive.

A pump system often operates under changing process conditions.

The required flow may change depending on production, water level, pipeline pressure, or plant demand.

Using a variable-frequency drive allows the pump motor speed to follow the process requirement.

Potential benefits include:

• Adjustable flow.
• Pressure control.
• Controlled acceleration.
• Controlled deceleration.
• Reduced mechanical shock.
• Improved coordination between multiple pumps.
• Flexible process operation.

Typical applications include:

• Raw-water pumps.
• Cooling-water pumps.
• Wastewater pumps.
• Process-water pumps.
• Transfer pumps.
• Irrigation pumps.
• Mining dewatering pumps.
• Industrial circulation pumps.

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20. Fan Applications

Large fans can consume substantial amounts of power, particularly when they operate continuously.

A variable-frequency drive can adjust fan speed according to airflow requirements.

Typical applications include:

• Industrial ventilation.
• Furnace exhaust.
• Process-air systems.
• Dust collection.
• Mine ventilation.
• Cement plant fans.
• Steel plant ventilation.
• Combustion-air systems.
• Large exhaust systems.

When the process requires less airflow, reducing motor speed can reduce mechanical power demand.

The actual energy-saving result depends on the fan design, operating point, operating hours, and process requirements.

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21. Blower Applications

Large blowers are used in many industrial processes.

Examples include:

• Aeration blowers.
• Process-air blowers.
• Combustion-air blowers.
• Pneumatic conveying systems.
• Industrial ventilation.
• Gas-handling systems.

The drive can adjust blower speed to match process demand where the blower and process permit variable-speed operation.

Controlled starting is also useful for large blower systems because the rotating assembly may have significant inertia.

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22. Conveyor Applications

Large conveyor systems can require substantial motor power.

A heavily loaded belt has considerable mechanical inertia.

Starting such a conveyor directly at full speed can place significant stress on the belt, gearbox, coupling, shaft, bearings, and drive pulley.

A variable-frequency drive can provide a controlled acceleration ramp.

This allows the motor to build speed gradually.

The drive can also provide adjustable operating speed where the material-flow rate changes during production.

Potential applications include:

• Mining conveyors.
• Aggregate conveyors.
• Cement conveyors.
• Bulk material handling.
• Port equipment.
• Manufacturing conveyors.
• Long-distance belt conveyors.

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23. Mining Applications

Mining facilities commonly use large motors for material movement, ventilation, pumping, and processing.

The 500 A capacity of the 20G1ALF500AN0NNNNN makes it suitable for high-power equipment.

Potential applications include:

• Long belt conveyors.
• Mine dewatering.
• Ventilation fans.
• Material handling.
• Processing systems.
• Large pumps.
• Auxiliary machinery.

Mining environments require careful consideration of dust, temperature, altitude, cable length, motor loading, and mechanical stress.

The drive should be selected and installed according to the actual environmental and application conditions.

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24. Cement and Aggregate Applications

Cement and aggregate plants contain many high-power rotating machines.

The drive can be used for:

• Process fans.
• Exhaust fans.
• Conveyors.
• Material-handling equipment.
• Large pumps.
• Dust extraction systems.
• Cooling equipment.
• Process machinery.

The ability to vary motor speed can help match equipment operation to production requirements.

Controlled starting can also reduce mechanical shock in large rotating equipment.

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25. Steel and Metal Processing

Steel and metal-processing plants often contain large motors operating for long periods.

Potential applications include:

• Cooling-water pumps.
• Process fans.
• Extraction systems.
• Large conveyors.
• Material-handling machinery.
• Auxiliary process equipment.

Variable-speed operation can be useful where the required production rate or process condition changes.

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26. Water and Wastewater Treatment

Water and wastewater systems often have highly variable flow requirements.

A large pump does not necessarily need to operate at full speed continuously.

The drive can adjust motor speed according to process requirements.

Typical control variables can include:

• Flow.
• Pressure.
• Tank level.
• Process demand.
• Operating schedule.

Large blowers used for aeration can also benefit from variable-speed operation when airflow requirements change.

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27. Compressor Applications

Large compressors can be candidates for variable-frequency drive control when their mechanical and process design permits variable-speed operation.

Potential applications include:

• Industrial air compressors.
• Process-gas equipment.
• Large ventilation systems.
• Process plants.

Compressor applications require particular attention to minimum and maximum operating speeds, compressor maps, torque characteristics, lubrication, cooling, and process limits.

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28. Main Product Advantages

High Current Capacity

The 500 A rating provides a substantial current capability for large industrial motors.

This makes the drive suitable for applications where smaller drive frames cannot provide sufficient current.

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High Motor-Power Capability

The 530 kW LD, 500 kW ND, and 400 kW HD ratings provide a wide range of large-motor applications.

The drive can therefore be used for substantial industrial machinery without moving to an even larger frame.

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690 VAC Voltage Class

The 690 VAC class is suitable for high-power industrial motor systems.

It allows large motor power to be transmitted at lower current than an equivalent lower-voltage system.

This can be beneficial for plant electrical distribution and cable selection.

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Variable-Speed Control

The drive allows motor speed to be adjusted according to the process.

This is especially useful for pumps, fans, blowers, and conveyors.

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Controlled Acceleration

A programmable acceleration ramp can allow the motor to increase speed gradually.

This can reduce mechanical shock and improve starting behavior.

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Controlled Deceleration

The drive can provide controlled motor deceleration according to the programmed operating conditions.

Applications involving large regenerative energy should receive additional braking analysis.

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Industrial Network Integration

Embedded EtherNet/IP provides a practical way to integrate the drive into a plant automation system.

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Large-Frame Industrial Construction

Frame 8 construction provides a platform intended for high-power industrial installations.

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29. Same-Series and Related Model Recommendations

The following five models are closely related to the 20G1ALF500AN0NNNNN and are useful when comparing different current and motor-power requirements within the same 690 VAC PowerFlex 755 family.

Model	Voltage	Current	LD Rating	ND Rating	HD Rating	Frame
20G1ALF265AN0NNNNN	690 VAC	265 A	315 kW	250 kW	200 kW	8
20G1ALF330AN0NNNNN	690 VAC	330 A	355 kW	315 kW	250 kW	8
20G1ALF370AN0NNNNN	690 VAC	370 A	400 kW	355 kW	300 kW	8
20G1ALF415AN0NNNNN	690 VAC	415 A	450 kW	400 kW	355 kW	8
20G1ALF460AN0NNNNN	690 VAC	460 A	500 kW	450 kW	375 kW	8

These models provide a logical progression toward the 500 A configuration.

The 460 A model is the closest lower-current reference, while the 415 A, 370 A, 330 A, and 265 A configurations cover progressively smaller motor requirements.

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30. Same-Series Model Comparison Including Mechanical Data

Model	Current	LD	ND	HD	Voltage	Frame	Approx. Dimensions	Approx. Weight
20G1ALF265AN0NNNNN	265 A	315 kW	250 kW	200 kW	690 VAC	8	2453 × 600 × 800 mm*	623 kg*
20G1ALF330AN0NNNNN	330 A	355 kW	315 kW	250 kW	690 VAC	8	2453 × 600 × 800 mm*	623 kg*
20G1ALF370AN0NNNNN	370 A	400 kW	355 kW	300 kW	690 VAC	8	2453 × 600 × 800 mm*	623 kg*
20G1ALF415AN0NNNNN	415 A	450 kW	400 kW	355 kW	690 VAC	8	2453 × 600 × 800 mm*	623 kg*
20G1ALF460AN0NNNNN	460 A	500 kW	450 kW	375 kW	690 VAC	8	2453 × 600 × 800 mm*	623 kg*

*The dimensional and weight values in this comparison are Frame 8 planning values, not a statement that every option configuration has exactly the same shipping envelope or weight. Exact mechanical drawings should be checked for the specific catalog configuration before fabrication, transportation, or lifting.

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31. Five Same-Brand Reference Models

For the requested same-brand comparison, the following five PowerFlex 755 models provide useful reference points across different voltage and power classes.

They are presented as same-brand reference models, rather than as a strict popularity ranking.

Model	Voltage	Current	Normal Duty	Heavy Duty	Frame	Typical Application
20G1AND125AN0NNNNN	480 VAC	125 A	100 HP	75 HP	6	Pumps, fans, general machinery
20G1AND156AN0NNNNN	480 VAC	156 A	125 HP	100 HP	6	Industrial process equipment
20G1AND186AN0NNNNN	480 VAC	186 A	150 HP	125 HP	6	Pumps, fans and conveyors
20G1AND248AN0NNNNN	480 VAC	248 A	200 HP	150 HP	6	Larger industrial machinery
20G1AND302AN0NNNNN	480 VAC	302 A	250 HP	200 HP	7	High-power pumps, fans and process equipment

These models represent the same general PowerFlex 755 platform but at a lower voltage class and lower power range than the 690 VAC 500 A model. The 480 VAC range includes 125 A, 156 A, 186 A, 248 A and 302 A configurations with corresponding normal-duty and heavy-duty ratings. 

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32. Same-Brand Reference Model Parameters

Model	Input Voltage	Current	Normal Duty	Heavy Duty	Frame	Approx. Power Class
20G1AND125AN0NNNNN	480 VAC	125 A	100 HP	75 HP	6	75–100 HP class
20G1AND156AN0NNNNN	480 VAC	156 A	125 HP	100 HP	6	100–125 HP class
20G1AND186AN0NNNNN	480 VAC	186 A	150 HP	125 HP	6	125–150 HP class
20G1AND248AN0NNNNN	480 VAC	248 A	200 HP	150 HP	6	150–200 HP class
20G1AND302AN0NNNNN	480 VAC	302 A	250 HP	200 HP	7	200–250 HP class

These lower-voltage models can be useful when a project has a 480 VAC motor system rather than a 690 VAC motor system.

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33. Mechanical Comparison With the Main Model

Model	Frame	Typical Enclosure	Approx. Height	Approx. Width	Approx. Depth	Approx. Weight
20G1ALF500AN0NNNNN	8	IP20 / Type 1 MCC Style	2453 mm*	600 mm*	800 mm	623 kg*
20G1AND125AN0NNNNN	6	Open Type / configuration dependent	Configuration dependent	Configuration dependent	Configuration dependent	Configuration dependent
20G1AND156AN0NNNNN	6	Open Type / configuration dependent	Configuration dependent	Configuration dependent	Configuration dependent	Configuration dependent
20G1AND186AN0NNNNN	6	Open Type / configuration dependent	Configuration dependent	Configuration dependent	Configuration dependent	Configuration dependent
20G1AND248AN0NNNNN	6	Open Type / configuration dependent	Configuration dependent	Configuration dependent	Configuration dependent	Configuration dependent
20G1AND302AN0NNNNN	7	Open Type / configuration dependent	Configuration dependent	Configuration dependent	Configuration dependent	Configuration dependent

*Planning values for the high-power Frame 8 MCC-style configuration. Exact dimensions and weight depend on the complete mechanical configuration.

The smaller reference models are not physically interchangeable with the Frame 8 500 A drive.

They belong to different frame and voltage classes and should therefore be selected according to the actual motor and system requirements.

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34. Pump System Advantages

The 20G1ALF500AN0NNNNN is well suited to large pump systems where motor speed must follow changing process conditions.

Main advantages include:

• Adjustable pump speed.
• Controlled acceleration.
• Controlled stopping.
• Reduced mechanical shock.
• Flexible flow control.
• Pressure regulation.
• Centralized monitoring.
• Integration with plant automation.
• Potential reduction in unnecessary throttling.

For very large pumping systems, the 500 A rating provides substantial electrical capacity.

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35. Fan System Advantages

Large industrial fans can benefit from variable-speed control because airflow requirements often change.

The drive allows fan speed to be adjusted rather than operating continuously at full speed.

Potential advantages include:

• Variable airflow.
• Controlled starting.
• Reduced mechanical stress.
• Process-based operation.
• Centralized monitoring.
• Flexible operating schedules.
• Potential energy savings at reduced operating speed.

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36. Conveyor System Advantages

Large conveyors can experience considerable mechanical stress during starting.

The drive can provide a controlled acceleration ramp.

This can help reduce stress on:

• Conveyor belts.
• Gearboxes.
• Couplings.
• Bearings.
• Shafts.
• Drive pulleys.
• Mechanical structures.

The adjustable speed function can also be useful where production rates change.

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37. Industrial Process Advantages

For process machinery, a variable-frequency drive can provide a more flexible relationship between motor speed and process demand.

Instead of using a fixed-speed motor and relying entirely on mechanical regulation, the drive can become part of the process-control strategy.

This is particularly useful for:

• Pumps.
• Fans.
• Blowers.
• Conveyors.
• Process machinery.
• Material-handling equipment.

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38. Network Integration Advantages

Embedded EtherNet/IP provides an effective method for integrating the drive into a larger automation system.

A typical architecture can be represented as:

Industrial Controller → EtherNet/IP Network → PowerFlex 755 Drive → Large AC Motor

The control system can send commands and references to the drive.

The drive can return status and operating information.

This arrangement is useful for plants with many motors because operators can monitor multiple drives from a central control system.

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39. Maintenance Requirements

Large-frame drives should be included in a scheduled preventive-maintenance program.

Maintenance Area	Inspection
Cooling Fans	Check airflow, noise and vibration
Air Passages	Check for dust and obstruction
Power Connections	Inspect for overheating and loose connections
Grounding	Verify grounding integrity
Motor Cables	Check insulation and connection condition
Control Wiring	Check terminals and wiring
Communication	Check network connection
Cabinet	Check cleanliness and ventilation
Fault History	Review repeated faults
Environmental Conditions	Check temperature, moisture and contamination

Cooling-system maintenance is particularly important for a high-current drive.

Dust buildup around ventilation paths can reduce heat transfer and increase operating temperature.

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40. Installation Engineering Checklist

Before installing the 20G1ALF500AN0NNNNN, the following items should be reviewed.

Engineering Item	Required Check
Motor Voltage	Confirm compatibility with 690 VAC drive class
Motor Current	Confirm full-load current
Motor Power	Confirm motor kW
Duty Rating	Select LD, ND or HD
Starting Torque	Confirm required torque
Overload	Confirm application overload
Speed Range	Confirm minimum and maximum speed
Braking	Determine regenerative-energy requirements
Input Supply	Confirm 690 VAC three-phase supply
Protection	Coordinate upstream protective devices
Grounding	Confirm grounding system
Motor Cable	Correctly size and route cables
Ambient Temperature	Check installation conditions
Altitude	Check applicable derating
Ventilation	Provide adequate airflow
Cabinet Space	Verify dimensions and maintenance clearance
Floor Loading	Verify support for approximately 623 kg
Lifting	Prepare suitable handling equipment
Network	Confirm EtherNet/IP architecture
Maintenance Access	Provide safe service access

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41. Floor Loading and Transportation

The approximate 623 kg equipment weight is an important installation consideration.

The supporting floor or structural platform should be evaluated for the concentrated equipment load.

Transportation planning should include:

• Delivery vehicle capacity.
• Loading equipment.
• Unloading equipment.
• Door dimensions.
• Passage width.
• Floor strength.
• Turning radius.
• Lifting equipment.
• Final installation position.

Because the drive is approximately 2.45 m high, transportation routes should also be checked for overhead clearance.

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42. Environmental Considerations

The drive should be installed in an environment suitable for industrial electronic equipment.

The following conditions should be evaluated:

• Ambient temperature.
• Humidity.
• Dust.
• Corrosive gases.
• Oil mist.
• Vibration.
• Altitude.
• Ventilation.
• Heat accumulation.

The IP20 / Type 1 configuration should not be interpreted as protection against severe environmental exposure.

Where the surrounding environment is harsh, the complete installation may require additional enclosure or environmental controls.

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43. Motor Cable Considerations

High-power VFD systems require careful motor-cable design.

The motor cable should be selected according to:

• Rated current.
• Voltage.
• Cable length.
• Installation method.
• Ambient temperature.
• Insulation requirements.
• Grounding arrangement.
• Electromagnetic compatibility.

Long motor cables can affect the electrical behavior of the drive/motor system.

Cable routing should also keep motor-power cables separated from sensitive control and communication wiring wherever practical.

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44. Electrical Protection

The upstream electrical system should be coordinated with the drive.

Engineering should consider:

• Short-circuit current.
• Protective-device rating.
• Disconnect arrangement.
• Grounding.
• Cable ampacity.
• Coordination with upstream equipment.
• Motor protection.
• Emergency-stop requirements.

The drive should be installed according to the applicable electrical standards and the requirements of the specific plant.

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45. Product Advantages Summary

Advantage	Description
500 A Capacity	Suitable for very large industrial motors
530 kW LD	High light-duty motor-power capability
500 kW ND	Suitable for large general-purpose industrial loads
400 kW HD	Suitable for demanding heavy-duty applications
690 VAC	High-voltage class for large motors
Frame 8	Large industrial drive architecture
Variable Speed	Matches motor operation to process demand
Controlled Acceleration	Helps reduce mechanical shock
Controlled Deceleration	Provides adjustable stopping profiles
EtherNet/IP	Supports automation-system integration
Forced Air Cooling	Supports high-power operation
MCC-Style Construction	Suitable for structured industrial installations
Flexible Applications	Pumps, fans, blowers, conveyors and process equipment

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46. Typical Industries

The 20G1ALF500AN0NNNNN can be considered for the following industrial sectors.

Water and Wastewater

Large pumping stations, transfer pumps, process pumps, and blower systems.

Mining

Heavy conveyors, dewatering systems, ventilation fans, and material-handling equipment.

Cement and Aggregate

Process fans, conveyors, material handling, dust collection, and large pumps.

Steel and Metals

Cooling systems, process fans, pumps, conveyors, and auxiliary process machinery.

Chemical Processing

Process pumps, circulation systems, blowers, and other variable-speed equipment.

Pulp and Paper

Large pumps, fans, blowers, and process machinery.

General Manufacturing

Large production machines, ventilation systems, material handling, and process equipment.

Utilities

Large auxiliary pumps, fans, and other rotating equipment.

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47. Selection Compared With the 460 A Model

The 500 A model is particularly useful when the 460 A configuration does not provide sufficient current capacity.

Model	Current	LD	ND	HD
20G1ALF460AN0NNNNN	460 A	500 kW	450 kW	375 kW
20G1ALF500AN0NNNNN	500 A	530 kW	500 kW	400 kW

The 500 A version provides an additional 40 A of rated current compared with the 460 A version.

It also increases the listed power capability to 530 kW LD, 500 kW ND, and 400 kW HD.

This additional capacity can be useful when a motor operates near the upper current limit of the 460 A configuration.

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48. Selection Compared With the 415 A Model

Model	Current	LD	ND	HD
20G1ALF415AN0NNNNN	415 A	450 kW	400 kW	355 kW
20G1ALF500AN0NNNNN	500 A	530 kW	500 kW	400 kW

The difference becomes more significant when the application has high continuous current or heavy-duty requirements.

The 500 A model provides greater electrical margin for a large motor application, subject to proper drive sizing and actual load conditions.

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49. Product Identification

The catalog number is:

20G1ALF500AN0NNNNN

The key characteristics represented by the model are associated with the PowerFlex 755 family, high-power AC drive configuration, 690 VAC voltage class, 500 A current rating, and the selected enclosure and option arrangement.

The complete catalog number should always be retained when ordering a replacement.

Two drives may look similar externally while having different electrical or option configurations.

For replacement work, the full catalog number and nameplate information should therefore be checked.

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50. Final Technical Specification Table

Specification	Value
Model	20G1ALF500AN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product Type	High-Power AC Variable Frequency Drive
Input Voltage	690 VAC
Input Phase	3 Phase
Rated Current	500 A
Light-Duty Rating	530 kW
Normal-Duty Rating	500 kW
Heavy-Duty Rating	400 kW
Frame	8
Cooling	Forced Air
Enclosure	IP20 / Type 1
Installation Style	800 mm Deep MCC Style
Approx. Height	2453 mm
Approx. Width	600 mm
Approx. Depth	800 mm
Approx. Weight	623 kg
Input	AC with Precharge
DC Terminals	None
Communication	Embedded EtherNet/IP
Filtering	Filtered
CM Jumper	Removed
Dynamic Braking	None
HIM	Blank / No HIM
Main Applications	Pumps, fans, blowers, conveyors, compressors and process equipment

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51. Overall Product Description

The Allen-Bradley 20G1ALF500AN0NNNNN PowerFlex 755 AC Drive is a high-power industrial variable-frequency drive designed for large three-phase AC motors.

Its 690 VAC, 500 A electrical rating places it in the high-power industrial drive category.

The drive provides approximately 530 kW light-duty, 500 kW normal-duty, and 400 kW heavy-duty capability, allowing it to be applied to different types of industrial loads.

The Frame 8 construction is intended for large industrial installations where high electrical capacity, forced-air cooling, structured cabinet installation, and appropriate maintenance access are required.

The model is configured with embedded EtherNet/IP, AC input with precharge, no DC terminals, IP20 / Type 1 enclosure, 800 mm deep MCC-style construction, filtered operation, CM jumper removed, no dynamic braking, and no HIM. 

The approximate planning dimensions are 2453 mm high × 600 mm wide × 800 mm deep, with an approximate weight of 623 kg.

The drive is particularly suitable for large pumps, industrial fans, blowers, conveyors, mining equipment, cement machinery, water-treatment systems, process machinery, and other large rotating equipment.

For pump and fan applications, variable-speed control allows motor operation to follow changing process requirements.

For conveyor systems, controlled acceleration can reduce mechanical shock during starting.

For large process machinery, the drive provides a practical way to combine high motor power with adjustable speed and automation-system integration.

The embedded EtherNet/IP capability is especially useful in plants where multiple large drives must be monitored and controlled from a central automation system.

The 500 A rating also makes this model a useful step above the 460 A configuration when additional current capacity is required.

Before final selection, the motor nameplate current, motor voltage, duty classification, overload requirements, acceleration and deceleration characteristics, braking requirements, operating speed range, ambient temperature, altitude, motor-cable length, ventilation, floor loading, and installation space should all be checked.

The Allen-Bradley 20G1ALF500AN0NNNNN is therefore a high-capacity PowerFlex 755 drive intended for large industrial motor applications where substantial power, controlled speed, process flexibility, and reliable automation integration are required.