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Allen-Bradley 20G1G3D505LNDNNNNN PowerFlex 755 AC Drive

1. Product Overview

The Allen-Bradley 20G1G3D505LNDNNNNN is a high-power, air-cooled AC variable frequency drive belonging to the PowerFlex 755 family.

It is designed for large industrial motors where conventional compact variable frequency drives are no longer sufficient in terms of output current, motor power, overload capability, or system integration.

The model is configured for the 480 VAC, three-phase class and has a 505 A normal-duty rating. In the PowerFlex 755 rating structure, this rating corresponds to approximately 400 HP normal-duty operation, or approximately 298 kW.

For applications requiring a higher overload capability, the same drive rating class is associated with approximately 350 HP heavy-duty operation. This difference is important when selecting the drive because the motor should be matched according to actual nameplate current, torque requirement, overload profile, acceleration characteristics, and operating conditions rather than horsepower alone.

The drive uses forced-air cooling and a large floor-mounted cabinet arrangement. Its physical construction reflects the high electrical power level of the equipment and makes it particularly suitable for large industrial plants, process facilities, production lines, material-handling systems, pumping stations, and other high-power machinery.

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2. Brand and Product Series

Category	Specification
Brand	Allen-Bradley
Product Family	PowerFlex
Product Series	PowerFlex 755
Broader Family	PowerFlex 750-Series
Product Type	High-power AC variable frequency drive
Drive Configuration	Air-cooled packaged drive
Exact Model	20G1G3D505LNDNNNNN
Input Voltage Class	480 VAC
Input Phase	Three-phase
Normal-Duty Current	505 A
Normal-Duty Motor Rating	400 HP
Heavy-Duty Motor Rating	Approximately 350 HP
Approximate Normal-Duty Power	298 kW
Cooling	Forced air
Mounting	Floor mounted
Frame	Frame 8 class
Enclosure	IP21 / UL Type 1 class
Typical Application	Large industrial motor control

The PowerFlex 755 series is intended for applications where high motor power and flexible control functions are important.

The 20G1G3D505LNDNNNNN sits in the larger end of the single-drive PowerFlex 755 range and is suitable for motors around the 400 HP normal-duty class.

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3. Product Identification

The complete catalog number is:

20G1G3D505LNDNNNNN

The catalog number contains several configuration sections.

Catalog Section	General Meaning	Description
20G	Product family	PowerFlex 755
1	Input/configuration identifier	AC input configuration
G	Packaged-drive configuration	High-power drive configuration
3	Enclosure configuration	IP21 / UL Type 1, floor-mounted configuration
D	Voltage code	480 VAC / 650 VDC class
505	Rating code	505 A normal-duty class
L	Filtering configuration	No EMC filtering configuration
N	Option position	Factory configuration position
D	Configuration position	Factory configuration identifier
NNNNN	Additional positions	Additional factory configuration positions

The complete catalog number should be retained when identifying or replacing the drive.

The D505 portion is especially important because it identifies the 480 VAC, approximately 505 A rating class.

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4. Main Technical Parameters

Parameter	Specification
Model	20G1G3D505LNDNNNNN
Brand	Allen-Bradley
Product Series	PowerFlex 755
Product Type	AC Variable Frequency Drive
Cooling Method	Forced air
Input Voltage	480 VAC
Input Phase	Three-phase
Nominal Input Frequency	60 Hz
Normal-Duty Continuous Output Current	505 A
Normal-Duty Motor Rating	400 HP
Normal-Duty Power	Approximately 298 kW
Heavy-Duty Motor Rating	Approximately 350 HP
Heavy-Duty Power	Approximately 261 kW
Frame	Frame 8
Mounting	Floor mounted
Enclosure Class	IP21 / UL Type 1
Drive Architecture	PowerFlex 755
Motor Control	Variable-frequency AC motor control
Cooling	Forced air
Input Precharge	Yes
DC Bus	Integrated
Dynamic Braking	Configuration dependent
Regeneration	Application/configuration dependent
Feedback	Available with compatible option
Communication	Available with compatible option
I/O Expansion	Available through compatible option modules
Programmable Acceleration	Yes
Programmable Deceleration	Yes
Current Limiting	Yes
Electronic Motor Protection	Available
Fault Monitoring	Integrated
Approximate Height	2453 mm class
Approximate Width	600 mm class
Approximate Depth	600–800 mm class
Approximate Weight	623 kg class
Weight Unit	kg

The 505 A rating is the key electrical selection parameter.

The actual motor should be checked against the drive’s applicable duty rating and motor nameplate current before final selection.

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5. Electrical Rating

The D505 rating is associated with a 505 A normal-duty output current at 480 VAC.

The corresponding normal-duty motor rating is approximately 400 HP.

For heavy-duty applications, the corresponding motor class is approximately 350 HP.

Duty Category	Current Class	Approx. Motor Rating	Approx. Power
Normal Duty	505 A	400 HP	298 kW
Heavy Duty	505 A class	350 HP	261 kW
Light Duty	Higher overload/current class depending on rating table	Up to approximately 450 HP class	Application dependent

The normal-duty and heavy-duty figures should not be mixed when selecting a motor.

A high-inertia conveyor, mixer, crusher, or other constant-torque load can require more overload capacity than a centrifugal fan or pump.

The drive selection should therefore be based on the actual load profile.

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6. Detailed Electrical Characteristics

Electrical Parameter	Specification
Model	20G1G3D505LNDNNNNN
Nominal Input Voltage	480 VAC
Input Voltage Class	480 VAC
Input Phase	3 phase
Input Frequency	60 Hz nominal
Output Current	505 A normal-duty class
Normal-Duty HP	400 HP
Heavy-Duty HP	Approx. 350 HP
Normal-Duty Power	Approx. 298 kW
Heavy-Duty Power	Approx. 261 kW
Output Voltage	Variable according to motor-control requirements
Output Frequency	Programmable
Motor Speed Reference	Programmable
Acceleration Time	Programmable
Deceleration Time	Programmable
Current Limit	Programmable
Motor Overload Protection	Available
Drive Protection	Integrated
Fault Monitoring	Integrated
DC Bus	Integrated
Input Precharge	Yes
Motor Feedback	Configuration dependent
Communication	Configuration dependent
Dynamic Braking	Configuration dependent
Regenerative Operation	Requires application-specific configuration
Control I/O	Expandable
Motor Control	V/Hz and vector-oriented control capabilities

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7. Normal-Duty and Heavy-Duty Operation

One of the most important points when using the 20G1G3D505LNDNNNNN is understanding the difference between normal-duty and heavy-duty operation.

Under normal-duty conditions, the model is rated at approximately:

505 A / 400 HP / 298 kW

Under heavy-duty conditions, the applicable motor rating is approximately:

350 HP / 261 kW

This means that the same drive cannot automatically be treated as a 400 HP drive for every type of load.

A centrifugal pump, centrifugal fan, constant-torque conveyor, mixer, crusher, or hoist can place very different demands on the drive.

The motor nameplate current and required overload profile should therefore be used as the primary selection criteria.

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8. Product Introduction

The 20G1G3D505LNDNNNNN is a large industrial variable frequency drive intended for controlling high-power AC motors.

Its main purpose is to provide controlled electrical power to a motor while allowing the motor’s speed and operating characteristics to be adjusted according to the process.

A large motor can create significant starting current when connected directly to the electrical supply.

A variable frequency drive can instead gradually increase the output frequency and voltage, allowing the motor to accelerate in a controlled manner.

This can make the starting process smoother and can reduce the mechanical shock transmitted to the machine.

The same concept applies to stopping.

Rather than immediately disconnecting a large motor, the drive can apply a programmed deceleration profile, subject to the braking characteristics and configuration of the application.

For industrial production equipment, this provides more control over the entire motor operating cycle.

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9. Main Applications

9.1 Large Conveyors

Large conveyors are one of the most practical applications for this type of drive.

Long conveyors can have substantial mechanical inertia and can carry large quantities of material.

Sudden starting can place significant stress on belts, gearboxes, couplings, shafts, and other components.

The drive can provide a controlled acceleration profile.

It can also provide adjustable operating speed when production throughput changes.

Typical applications include:

• Mining conveyors
• Aggregate conveyors
• Bulk-material handling
• Production conveyors
• Transfer conveyors
• Large warehouse systems
• Process-material conveyors

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9.2 Large Industrial Pumps

Large pumps often benefit from variable-speed control.

Instead of operating continuously at a fixed speed, the motor can be adjusted according to process requirements.

Applications can include:

• Water-transfer pumps
• Cooling-water systems
• Industrial process pumps
• Wastewater systems
• Large circulation systems
• Process-fluid systems
• Pumping stations

For centrifugal pump applications, speed control can be especially useful because the pump operating point changes as speed changes.

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9.3 Large Fans

Industrial fans can require hundreds of horsepower.

The drive allows fan speed to be adjusted according to airflow demand.

Potential applications include:

• Furnace fans
• Process exhaust
• Combustion-air systems
• Industrial ventilation
• Cooling systems
• Large air-handling equipment

Variable-speed control can also help avoid unnecessary full-speed operation when the process requires less airflow.

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9.4 Large Blowers

Large blowers can operate at different speeds depending on production requirements.

The drive can provide adjustable speed and controlled acceleration.

This makes it suitable for industrial drying, ventilation, combustion, process-air, and material-processing systems.

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9.5 Compressors

Large compressors may require controlled acceleration and stable operating speed.

The drive can be incorporated into suitable compressor systems where variable-frequency operation is supported by the compressor design.

The compressor’s torque characteristics and minimum operating speed should be evaluated before final selection.

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9.6 Mixers and Agitators

Large mixers can have high starting torque requirements.

The drive can provide a controlled acceleration profile and adjustable operating speed.

This can be useful in:

• Chemical processing
• Material preparation
• Industrial mixing
• Process production
• Bulk material treatment

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9.7 Mills

Large mills can require high motor power and controlled speed.

The drive can be used to control motor operation while allowing the production process to adjust operating speed.

Milling applications should be evaluated carefully because the mechanical load can be highly variable.

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9.8 Rollers

Industrial rollers can require stable motor speed and substantial power.

The drive can provide programmable speed control and integration with the wider machine-control system.

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9.9 Material-Handling Machinery

Large material-handling systems can use variable-speed drives to coordinate machine movement.

Potential applications include:

• Feeders
• Transfer systems
• Heavy conveyors
• Processing lines
• Bulk-material equipment
• Industrial handling equipment

Applications involving lifting or hoisting require additional attention to braking and feedback functions.

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10. Main Product Advantages

10.1 High 505 A Output Capacity

The most obvious characteristic of this model is its 505 A normal-duty output rating.

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

It is suitable for large motors that would exceed the current capability of compact or medium-frame drives.

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10.2 Approximately 400 HP Normal-Duty Rating

The 505 A D-series rating corresponds to approximately 400 HP normal-duty operation.

This makes the drive suitable for large industrial equipment requiring substantial motor power.

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10.3 Heavy-Duty Capability

For applications requiring greater overload performance, the applicable motor rating is approximately 350 HP.

This makes the drive suitable for applications where starting or operating torque can be significantly higher than that of a typical variable-torque load.

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10.4 Controlled Motor Starting

The drive can gradually increase motor speed during startup.

This can reduce mechanical shock and make the starting process easier to manage.

For large machines, this can be an important advantage.

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10.5 Adjustable Speed

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

The drive can provide a variable speed reference according to the process.

This is particularly useful for pumps, fans, conveyors, blowers, and process machinery.

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10.6 Programmable Acceleration and Deceleration

Different machines require different acceleration and stopping profiles.

The drive allows these parameters to be configured for the application.

A high-inertia machine can therefore be treated differently from a low-inertia machine.

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10.7 Flexible Motor Control

The PowerFlex 755 architecture provides more sophisticated motor-control functions than a basic V/Hz inverter.

Depending on the configuration and motor, vector-oriented control and feedback options can be used for applications requiring improved control performance.

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10.8 Automation Integration

The drive can be incorporated into an industrial automation system.

It can exchange operating commands and information with the larger control architecture.

Typical information can include:

• Speed reference
• Motor speed
• Output current
• Drive status
• Fault status
• Alarm information
• Operating conditions

This can simplify centralized monitoring of large motor systems.

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10.9 Expandable Architecture

The platform supports various options for communication, feedback, I/O, and application-specific functions.

This makes it easier to adapt the drive to different machine architectures.

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10.10 Large Industrial Construction

The floor-mounted cabinet arrangement is appropriate for high-power industrial installations.

It provides a practical structure for large power components, cooling systems, control components, and associated electrical equipment.

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11. Dimensions and Weight

The 20G1G3D505LNDNNNNN is a large floor-mounted drive.

For the applicable Frame 8 packaged configuration, a representative physical envelope is approximately:

2453 mm × 600 mm × 600–800 mm

The approximate equipment weight is:

623 kg

Mechanical Parameter	Specification
Model	20G1G3D505LNDNNNNN
Frame	Frame 8
Mounting	Floor mounted
Enclosure	IP21 / UL Type 1
Height	Approx. 2453 mm
Width	Approx. 600 mm
Depth	Approx. 600–800 mm
Approx. Dimensions	2453 × 600 × 600–800 mm
Approx. Weight	623 kg
Weight Unit	kg
Cooling	Forced air
Installation Orientation	Upright
Cabinet Type	Large industrial cabinet
Service Access	Required
Lifting	Mechanical lifting equipment normally required

The exact dimensions and shipping weight can vary according to the complete factory configuration.

Additional equipment such as disconnects, reactors, filters, wiring compartments, and other accessories may increase the final envelope and weight.

For a final installation, the dimensional drawing for the exact configuration should be used.

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12. Cooling and Thermal Management

The drive uses forced-air cooling.

At this power level, thermal management is an important part of system design.

The cooling airflow must not be obstructed.

The installation environment should also be evaluated for temperature, altitude, dust, humidity, and air quality.

A clean electrical room and a harsh production environment can produce very different cooling conditions.

The cooling system should therefore be included in the preventive-maintenance program.

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13. Installation Requirements

The approximately 623 kg equipment weight means that installation must be planned carefully.

The floor or support structure must be capable of handling the equipment.

Transportation and positioning normally require appropriate lifting equipment.

The cabinet should be installed upright and securely anchored.

Sufficient clearance should be provided for airflow and maintenance access.

Installation Parameter	Requirement / Consideration
Floor capacity	Must support the final installed weight
Equipment weight	Approx. 623 kg
Cabinet orientation	Upright
Cooling	Maintain adequate airflow
Service access	Provide suitable maintenance clearance
Incoming power	Correctly rated protection and conductors
Motor wiring	Properly sized for motor current
Grounding	Appropriate industrial grounding
Ambient temperature	Must remain within applicable operating range
Dust	Excessive accumulation should be avoided
Humidity	Avoid unsuitable condensation conditions
Lifting	Appropriate mechanical lifting equipment
Cabinet clearance	Follow installation requirements

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14. Maintenance

Regular maintenance is important for high-power air-cooled drives.

Cooling fans should be inspected for abnormal noise, vibration, and airflow problems.

Air passages should remain clean.

Power terminals should be inspected for loose connections and abnormal heating.

The cabinet should also be inspected for dust accumulation and environmental problems.

Maintenance Item	Recommended Inspection
Cooling fans	Operation, noise, vibration
Air passages	Clean and unobstructed
Cabinet ventilation	Adequate airflow
Power terminals	Tightness and overheating
Grounding	Electrical integrity
Motor cables	Insulation and connection condition
Control wiring	Secure connections
Cabinet interior	Dust and contamination
Fault history	Recurring fault investigation
Ambient conditions	Temperature, humidity, dust
External components	Filters, reactors, disconnects where applicable

The actual maintenance schedule should be established according to operating hours, environmental conditions, and plant maintenance procedures.

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15. Recommended Same-Series or Related Models

The following models are useful neighboring selections within the same high-power PowerFlex 755 family.

Model	Voltage	Normal-Duty Current	Normal-Duty HP	Heavy-Duty HP	Frame	Cooling	Approx. Dimensions	Approx. Weight
20G1G3D361LNDNNNNN	480 VAC	361 A	300 HP	250 HP	8	Forced air	Approx. 2453 × 600 × 600–800 mm	Approx. 623 kg
20G1G3D430LNDNNNNN	480 VAC	430 A	350 HP	300 HP	8	Forced air	Approx. 2453 × 600 × 600–800 mm	Approx. 623 kg
20G1G3D505LNDNNNNN	480 VAC	505 A	400 HP	350 HP	8	Forced air	Approx. 2453 × 600 × 600–800 mm	Approx. 623 kg
20G1G3D545LNDNNNNN	480 VAC	545 A	450 HP	350 HP class	8	Forced air	Approx. Frame 8 cabinet	Approx. 623 kg class
20G1G3D617LNDNNNNN	480 VAC	617 A	500 HP	400 HP	8	Forced air	Approx. Frame 8 cabinet	Approx. 623 kg class

These five models form a useful comparison range around the D505 rating.

The D361 and D430 versions are appropriate when a lower current requirement is sufficient.

The D545 and D617 versions provide additional capacity for larger motors.

The actual duty selection should always be checked against the motor nameplate and application load.

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16. Larger Related Models

When the motor power requirement exceeds the single Frame 8 range, larger PowerFlex 755 configurations can be considered.

Model	Voltage	Current Class	Normal-Duty Motor Rating	Heavy-Duty Motor Rating	Frame	Cooling	Approx. Weight
20G1G3D617LNDNNNNN	480 VAC	617 A	500 HP	400 HP	8	Forced air	Approx. 623 kg class
20G1G3D710LNDNNNNN	480 VAC	710 A	600 HP	450 HP	8	Forced air	Large cabinet class
20G1G3D740LNDNNNNN	480 VAC	740 A	650 HP	500 HP	8	Forced air	Large cabinet class
20G1G3D800LNDNNNNN	480 VAC	800 A class	700 HP	600 HP	9	Forced air	Approx. 1200 kg class
20G1G3D960LNDNNNNN	480 VAC	960 A class	800 HP	700 HP	9	Forced air	Approx. 1200 kg class

These models provide a progression toward larger motor applications.

As the current rating increases, the electrical-room space, thermal-management requirements, transportation requirements, and installation complexity also increase.

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17. Five Representative Same-Brand Models

The following five models represent useful products from the same brand’s broader PowerFlex range.

They are provided as representative comparison models rather than as a formal popularity ranking.

Model	Product Series	Voltage Class	Approx. Current	Approx. Motor Rating	Typical Application	Approx. Dimensions	Approx. Weight
25B-D010N114	PowerFlex 525	480 VAC class	10 A	Approx. 4–5.5 kW	Small pumps, fans, conveyors	Approx. 180 × 100 × 200 mm	Approx. 2–3 kg
25B-D017N114	PowerFlex 525	480 VAC class	17 A	Approx. 7.5–11 kW	General industrial machines	Approx. 180 × 100 × 200 mm	Approx. 3 kg
25B-D024N114	PowerFlex 525	480 VAC class	24 A	Approx. 11–15 kW	Pumps, fans, conveyors	Approx. 180 × 100 × 200 mm	Approx. 3–4 kg
25A-D017N114	PowerFlex 523	480 VAC class	17 A	Approx. 7.5–11 kW	Compact machine control	Approx. 180 × 100 × 200 mm	Approx. 2–3 kg
20F1ANC030JA0NNNNN	PowerFlex 753	480 VAC class	30 A class	Approx. 15–22 kW class	Advanced industrial machinery	Approx. 300 × 200 × 250 mm class	Approx. 15–20 kg

The difference between these products and the D505 model is substantial.

The smaller PowerFlex 523 and 525 products are designed for significantly smaller motors and machines.

The PowerFlex 753 occupies a higher-performance medium-power position.

The PowerFlex 755 D505 is designed for a completely different scale of application, with approximately 400 HP normal-duty capacity and a large floor-mounted cabinet.

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18. Product Comparison by Application Scale

Model	Approx. Current	Approx. Power Class	Physical Scale	Typical Application
25B-D010N114	10 A	4–5.5 kW	Compact	Small machinery
25B-D017N114	17 A	7.5–11 kW	Compact	General machine control
25B-D024N114	24 A	11–15 kW	Compact	Pumps/fans/conveyors
20F1ANC030JA0NNNNN	30 A class	15–22 kW	Medium	Industrial machinery
20G1G3D505LNDNNNNN	505 A	400 HP / 298 kW ND	Large cabinet	Large industrial machinery

This comparison demonstrates why the D505 model is normally installed in industrial electrical rooms or dedicated drive cabinets rather than in compact machine-control enclosures.

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19. Energy and Process-Control Benefits

Variable-speed control can provide process benefits when the motor does not need to run continuously at full speed.

For example, a large pump may only need reduced flow during part of the production cycle.

A large fan may need less airflow during periods of lower demand.

A conveyor may need to change speed according to material throughput.

A variable frequency drive can adjust motor speed to match these operating requirements.

The actual energy savings depend on the machine design, load profile, operating hours, motor efficiency, and process control strategy.

Therefore, the energy-saving potential should be calculated for the specific application.

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20. Automation and Control Benefits

The PowerFlex 755 architecture allows the drive to become part of a larger industrial automation system.

Instead of operating as an isolated motor controller, it can exchange information with the machine or plant control system.

Typical control information can include:

• Start and stop commands
• Speed reference
• Actual motor speed
• Output current
• Drive status
• Alarm information
• Fault information
• Operating parameters

This is useful in production environments where many large motors need to be monitored from a central control system.

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21. Industrial Application Areas

Industry	Typical Equipment
Mining	Conveyors, mills, fans
Cement	Conveyors, fans, process equipment
Aggregate	Conveyors, crushers, pumps
Water treatment	Large pumps
Wastewater	Pumping systems
Chemical processing	Mixers, pumps, blowers
Metals	Rollers, fans, process machinery
Manufacturing	Large production machinery
Power-related facilities	Pumps and fans
Material handling	Conveyors and transfer systems
General process industries	Pumps, fans, mixers, blowers

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22. Selection Checklist

Before selecting the 20G1G3D505LNDNNNNN for a new application, several factors should be checked.

Selection Parameter	Recommended Check
Motor voltage	Confirm 480 VAC compatibility
Motor current	Check motor nameplate current
Normal-duty power	Approximately 400 HP
Heavy-duty power	Approximately 350 HP
Load type	Variable torque or constant torque
Torque requirement	Determine continuous and peak torque
Overload	Determine required overload duration
Acceleration	Determine required acceleration time
Deceleration	Determine stopping requirements
Braking	Determine whether braking equipment is required
Regeneration	Determine whether regenerative operation is necessary
Feedback	Determine whether encoder feedback is required
Communication	Determine required control network
Environment	Temperature, altitude, humidity, dust
Harmonics	Evaluate incoming power-system requirements
Motor cable	Select suitable cable and installation method
Cabinet space	Allow for approximately 2.45 m height class
Floor loading	Plan for approximately 623 kg class
Cooling	Provide sufficient airflow
Service access	Provide appropriate maintenance clearance

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23. Product Advantages at a Glance

Feature	Practical Advantage
505 A normal-duty rating	Supports large industrial motors
400 HP normal-duty class	Suitable for high-power machinery
350 HP heavy-duty class	Provides greater overload application capability
480 VAC three-phase	Suitable for common industrial power systems
Forced-air cooling	Supports high-power electronics
Floor-mounted cabinet	Suitable for large industrial installations
Adjustable speed	Improves process flexibility
Controlled acceleration	Helps reduce mechanical startup shock
Controlled deceleration	Provides smoother stopping
Programmable parameters	Allows machine-specific setup
Vector-oriented control capability	Supports demanding motor-control applications
Feedback options	Supports enhanced control applications
Communication options	Allows automation integration
Expandable I/O	Supports additional machine functions
High-current architecture	Suitable for large motors
Industrial cabinet construction	Practical for large electrical installations

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24. Overall Product Summary

The Allen-Bradley 20G1G3D505LNDNNNNN is a high-power PowerFlex 755 AC variable frequency drive designed for large industrial motor applications.

Its principal electrical rating is 505 A at 480 VAC, three-phase.

At the normal-duty rating, the drive corresponds to approximately 400 HP / 298 kW.

For heavy-duty applications requiring greater overload capability, the applicable motor class is approximately 350 HP / 261 kW.

The product uses forced-air cooling and a large Frame 8 floor-mounted cabinet configuration.

A representative physical envelope is approximately 2453 mm high × 600 mm wide × 600–800 mm deep, with an approximate equipment weight of 623 kg.

The large physical dimensions and high weight are normal characteristics for a drive in this power class.

The model is suitable for large conveyors, pumps, fans, blowers, compressors, mixers, mills, rollers, material-handling equipment, and other large industrial machines.

Its main advantages are its high output-current capability, large motor capacity, adjustable speed, controlled acceleration and deceleration, flexible motor-control functions, automation-system integration, expandable architecture, and industrial floor-mounted construction.

The related D361, D430, D545, and D617 models provide useful alternatives around the same high-power range.

The D361 and D430 versions provide lower current capacity, while the D545 and D617 versions provide greater current capacity for larger motors.

For still larger applications, the D710, D740, D800, and D960 configurations provide a progression toward higher motor-power requirements.

When selecting the 20G1G3D505LNDNNNNN, the motor nameplate current should be considered together with horsepower, load type, torque characteristics, overload requirements, braking requirements, environmental conditions, and required feedback or communication functions.

The complete catalog number should also be retained when purchasing a replacement because configuration suffixes can distinguish products with different factory-installed options.

In practical terms, the 20G1G3D505LNDNNNNN can be described as a 480 VAC, three-phase, 505 A, 400 HP normal-duty, air-cooled PowerFlex 755 high-power AC drive intended for large industrial motor-control applications.

It is particularly appropriate when a compact drive is no longer adequate and the project requires a large-frame industrial drive capable of handling substantial motor current while providing adjustable speed, controlled acceleration, and integration into a larger automation system.