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Allen-Bradley 20G1ALC770AN0NNNNN PowerFlex 755 AC Drive

1. Product Overview

The Allen-Bradley 20G1ALC770AN0NNNNN is a high-power PowerFlex 755 AC drive designed for large industrial motor-control applications where substantial motor current, reliable speed regulation, industrial networking, and continuous-duty operation are required.

This model is part of the PowerFlex 755 family and is configured for 400 VAC three-phase operation. It has a rated current of 770 A and provides multiple duty ratings, including 450 kW for light-duty operation, 400 kW for normal-duty operation, and 355 kW for heavy-duty operation.

The drive uses forced-air cooling and an AC input with precharge. It does not use external DC terminals in this configuration. The construction is based on a large Frame 8 platform with an 800 mm deep MCC-style arrangement.

The model is particularly suitable for large pumps, fans, blowers, conveyors, compressors, process equipment, material-handling systems, water-treatment installations, and other industrial machinery requiring high-capacity variable-frequency motor control.

The embedded EtherNet/IP capability makes the drive suitable for integration into industrial automation systems where the drive needs to exchange commands, status information, diagnostics, and operating data with a controller or supervisory system.

The “AN0” configuration is an important part of the catalog number. This configuration is associated with the open Type 1/IP20 style, filtered construction, CM jumper removed configuration, no dynamic braking option, and a blank/no-HIM arrangement.

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2. Brand and Series

Item	Description
Brand	Allen-Bradley
Product Family	PowerFlex
Product Series	PowerFlex 755
Product Type	AC Variable Frequency Drive
Model	20G1ALC770AN0NNNNN
Application Class	Industrial Motor Control
Drive Construction	Air Cooled
Frame	Frame 8
Installation Style	800 mm Deep MCC Style
Input	400 VAC, Three Phase
Rated Current	770 A
Cooling	Forced Air
Communication	Embedded EtherNet/IP
Enclosure / Protection	Type 1 / IP20
HIM Configuration	Blank / No HIM
Dynamic Braking	None
DC Terminals	None
Input Configuration	AC Input with Precharge
EMC Configuration	Filtered
CM Jumper	Removed
Product Status	Legacy/discontinued catalog configuration

The PowerFlex 755 series is intended for demanding industrial applications where a conventional small-frame variable-frequency drive is not sufficient. The series covers a broad range of power ratings and provides a scalable platform for motor control, communications, diagnostics, and system integration.

The 20G1ALC770AN0NNNNN belongs to the high-current end of the 400 V class Frame 8 range.

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3. Main Technical Parameters

Parameter	Specification
Model	20G1ALC770AN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Drive Type	AC Variable Frequency Drive
Input Voltage	400 VAC
Input Phase	3 Phase
Rated Current	770 A
Light-Duty Rating	450 kW
Normal-Duty Rating	400 kW
Heavy-Duty Rating	355 kW
Frame Size	Frame 8
Cooling Method	Forced Air
Input Type	AC Input with Precharge
DC Terminals	None
Enclosure Style	Type 1 / IP20
Installation Depth	800 mm MCC Style
EMC	Filtered
CM Jumper	Removed
Dynamic Braking	None
HIM	Blank / No HIM
Communication	Embedded EtherNet/IP
Approx. Mechanical Width	Approximately 600 mm*
Approx. Mechanical Height	Approximately 2,000–2,400 mm*
Approx. Mechanical Depth	Approximately 800 mm*
Approx. Weight	Approximately 500–650 kg*
Cooling Requirement	Forced-air industrial cooling
Intended Environment	Indoor industrial installation
Control Function	Variable-speed AC motor control
Typical Motor Range	Up to approximately 400 kW under normal-duty conditions
Mounting Style	MCC-style / cabinet integration

*Physical dimensions and shipping/installed weight can vary according to the complete packaged configuration, cabinet arrangement, accessories, bus structure, and installation construction. The 800 mm depth is the specified MCC-style configuration depth; final installation should always be based on the applicable mechanical drawing.

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4. Understanding the 770 A Rating

The 770 A rating is one of the most important characteristics of this model.

A drive with a current capacity of 770 A is intended for large industrial motors and high-power mechanical loads. Current rating is particularly important because the motor current can increase substantially during acceleration, overload conditions, or when the driven equipment operates at high mechanical torque.

The 770 A configuration provides considerable electrical capacity while retaining several different application-duty ratings.

The three principal power ratings are:

Duty Category	Power Rating
Light Duty	450 kW
Normal Duty	400 kW
Heavy Duty	355 kW

The correct rating depends on the actual motor load profile.

A pump with relatively smooth torque characteristics may be selected using a normal-duty or light-duty rating, while equipment requiring frequent acceleration, high starting torque, or repeated overload operation may require the heavy-duty rating.

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5. Light-Duty, Normal-Duty and Heavy-Duty Operation

The different duty classifications are important when selecting a drive for an industrial motor.

Light Duty — 450 kW

The 450 kW light-duty rating is appropriate for applications where the motor load is comparatively moderate and the overload requirements are less demanding.

Typical examples include certain large centrifugal pumps and fans.

The advantage of using the light-duty rating is that the drive can support a higher nominal motor power under suitable load conditions.

Normal Duty — 400 kW

The 400 kW normal-duty rating provides a useful balance between motor capacity and overload capability.

This rating is commonly relevant to industrial machinery with relatively stable loading but more demanding operating conditions than simple fan or pump applications.

Heavy Duty — 355 kW

The 355 kW heavy-duty rating is intended for applications where the motor may experience higher torque requirements, more frequent acceleration, or greater overload demand.

Typical examples include conveyors, heavy material-handling equipment, crushers, mixers, and certain process machines.

The heavy-duty rating should be considered when the motor load is characterized by high torque rather than simply high horsepower or kilowatt output.

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6. Electrical Configuration

The 20G1ALC770AN0NNNNN is designed for a 400 VAC three-phase electrical system.

The three-phase input architecture makes it suitable for large industrial electrical distribution systems.

The drive converts incoming AC power into a controlled output suitable for regulating the speed and torque of an AC motor.

The basic energy path can be described as:

Three-phase AC input → rectification/DC bus → inverter switching → variable-frequency AC output → motor

By controlling the output frequency and voltage, the drive can regulate motor speed and torque according to the requirements of the application.

The AC input with precharge configuration is particularly important for a high-power drive because controlled charging of the DC bus helps manage the initial electrical charging current when the drive is energized.

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7. Embedded EtherNet/IP

The drive includes embedded EtherNet/IP communication capability.

This allows the drive to be integrated into an industrial control architecture without requiring the communication system to be treated as an entirely separate external function.

Typical communication functions can include:

• Start and stop commands.
• Speed reference commands.
• Drive status monitoring.
• Output current monitoring.
• Motor speed monitoring.
• Fault information.
• Warning information.
• Parameter access.
• Diagnostic information.
• Production data.
• Process-control information.

This capability is especially useful in large automated systems where the drive is part of a larger PLC-based control architecture.

For example, a water-treatment plant may use a controller to adjust pump speed according to pressure or flow requirements.

A conveyor system may use network commands to coordinate several drive-controlled motors.

A manufacturing line may monitor motor current and drive status continuously to identify abnormal operating conditions before a major process interruption occurs.

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8. Blank / No HIM Configuration

The model 20G1ALC770AN0NNNNN is specified with a blank/no-HIM configuration.

HIM means Human Interface Module.

The absence of an installed HIM is useful in applications where the drive is intended to be operated and monitored primarily through the control system rather than by a local operator interface.

This configuration can be particularly suitable for:

• Centralized control rooms.
• PLC-controlled production lines.
• MCC installations.
• Automated pump stations.
• Remote equipment.
• Large process systems.
• Systems where the operator interface is located elsewhere.

The absence of a local HIM does not mean that the drive lacks control functionality. It means that the particular catalog configuration does not include the handheld/local operator interface.

For commissioning and maintenance, the system designer should therefore consider how technicians will access drive parameters, diagnostics, and operating information.

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9. Type 1 / IP20 Construction

The 20G1ALC770AN0NNNNN is configured as Type 1 / IP20.

This type of enclosure arrangement is intended primarily for indoor industrial installations where the drive is protected from direct exposure to water, rain, dust contamination, and other environmental hazards.

The drive should normally be installed inside an appropriate electrical room, MCC, industrial cabinet, or protected equipment area.

The IP20 classification should not be interpreted as suitable for outdoor exposure or washdown service.

If the application requires high environmental protection, additional enclosure protection or another configuration should be considered.

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10. 800 mm Deep MCC-Style Installation

The 800 mm depth is an important mechanical characteristic of this configuration.

This is a large industrial drive rather than a compact wall-mounted inverter.

The MCC-style design allows the drive to be incorporated into larger electrical distribution and motor-control arrangements.

When designing the cabinet or MCC compartment, engineers should consider:

• Overall drive depth.
• Cable entry.
• Cable bending radius.
• Power-terminal access.
• Airflow.
• Heat dissipation.
• Service access.
• Maintenance clearance.
• Isolation equipment.
• Grounding.
• Ventilation.

The actual installation space should be larger than the basic drive dimensions because electrical and mechanical clearance is required around the equipment.

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11. Approximate Dimensions and Weight

Because this is a large Frame 8 MCC-style drive, the physical installation requirements are substantially greater than those of small PowerFlex drives.

For preliminary engineering and quotation work, the following values can be used as practical planning figures:

Mechanical Parameter	Approximate Value
Model	20G1ALC770AN0NNNNN
Frame	Frame 8
Installation Depth	800 mm
Approx. Width	600 mm
Approx. Height	2,000–2,400 mm
Approx. Depth	800 mm
Approx. Installed Weight	500–650 kg
Cooling	Forced Air
Mounting	MCC Style
Service Space	Additional clearance required

These figures should be treated as engineering planning values rather than a substitute for the final mechanical drawing.

For transportation, lifting, cabinet design, and foundation planning, the actual supplied configuration should be checked because accessories and the complete MCC arrangement can significantly affect dimensions and weight.

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12. Cooling System

The 20G1ALC770AN0NNNNN uses forced-air cooling.

At this power level, a considerable amount of heat is generated by semiconductor switching devices, bus components, filters, control electronics, and other power components.

Forced-air cooling provides controlled airflow through the drive to remove this heat.

Proper airflow is essential.

A high-power drive should not be installed in a confined space without adequate ventilation.

The installation should consider:

• Air inlet temperature.
• Air outlet temperature.
• Cabinet ventilation.
• Fan operation.
• Filter condition.
• Dust accumulation.
• Airflow direction.
• Clearance around ventilation openings.
• Ambient temperature.

If the cooling system is restricted, the drive may operate at a higher internal temperature, reducing component life and potentially causing thermal protection or derating.

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13. Product Introduction

The PowerFlex 755 platform is designed for high-performance industrial AC motor control.

The 20G1ALC770AN0NNNNN represents a high-capacity 400 V configuration intended for large motors and large mechanical systems.

The drive combines high current capability with network connectivity and industrial control functions.

Instead of operating a motor at a fixed speed directly from the electrical supply, the drive allows the motor to operate according to process requirements.

For example, a pump does not always need to operate at full speed.

If the process requires less flow, reducing motor speed can reduce the energy consumed by the pump system.

Similarly, a fan can operate at a lower speed when the required airflow is reduced.

A conveyor can accelerate gradually rather than applying full motor torque instantly.

These capabilities make a high-power variable-frequency drive an important part of modern industrial automation systems.

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14. Motor Speed Control

The fundamental function of the drive is to control the speed and torque of an AC motor.

The drive generates a controlled output waveform and adjusts the operating frequency and voltage according to the desired motor operating condition.

This enables:

• Smooth acceleration.
• Controlled deceleration.
• Adjustable operating speed.
• Torque management.
• Process synchronization.
• Reduced mechanical shock.
• Improved process control.
• Reduced unnecessary motor operation at full speed.

For large machines, these benefits can be especially significant because a sudden mechanical change in a large motor can create substantial stress on couplings, gearboxes, shafts, pumps, fans, and other mechanical components.

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15. Applications

15.1 Large Pump Systems

Large centrifugal pumps are one of the most suitable applications for this type of drive.

The drive can adjust pump motor speed according to process demand.

Instead of using a motor that continuously operates at full speed and controlling flow primarily through throttling, variable-speed operation allows the pumping system to respond more directly to the required process condition.

Typical applications include:

• Water supply.
• Industrial water circulation.
• Cooling-water systems.
• Process-water systems.
• Wastewater treatment.
• Irrigation.
• Chemical processing.
• Large building utility systems.

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15.2 Water and Wastewater Treatment

Large water-treatment systems often contain multiple pumps, blowers, mixers, and conveyors.

A high-capacity PowerFlex 755 drive can be used to control large motors within these systems.

Typical functions include:

• Raw-water pumping.
• Clear-water pumping.
• Sludge handling.
• Aeration blower control.
• Process-water circulation.
• Lift-station pumping.
• Large ventilation systems.

Variable-speed control can help match equipment output to changing process demand.

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15.3 Fans

Large industrial fans can require substantial motor power.

Typical examples include:

• Furnace fans.
• Cooling fans.
• Ventilation fans.
• Industrial exhaust systems.
• Air-handling systems.
• Process ventilation.

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

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15.4 Blowers

Blowers used in industrial processes can have significant motor requirements.

Examples include:

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

The 770 A current capacity makes this model appropriate for large blower motors where smaller drives would not provide sufficient capacity.

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15.5 Conveyor Systems

Heavy conveyors often require high starting torque.

This is where the heavy-duty rating becomes important.

Typical applications include:

• Mining conveyors.
• Aggregate conveyors.
• Cement conveyors.
• Bulk-material conveyors.
• Port handling systems.
• Industrial production lines.

Controlled acceleration can reduce mechanical shock and belt stress.

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15.6 Mining

Mining equipment can have very demanding motor loads.

Potential applications include:

• Conveyor systems.
• Pumps.
• Fans.
• Crushers.
• Material handling.
• Ventilation systems.

The high current rating and industrial construction make the PowerFlex 755 platform suitable for large mining-related motor-control systems when the complete application requirements are properly matched to the drive rating.

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15.7 Cement and Building Materials

Cement plants commonly use large motors for:

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

Large variable-speed drives can provide controlled starting and speed regulation for these systems.

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15.8 Pulp and Paper

Large motors are widely used in pulp and paper plants.

Applications may include:

• Pumps.
• Fans.
• Roll drives.
• Process equipment.
• Material handling.
• Ventilation.

The communication capability is useful when many drives are integrated into a centralized production-control system.

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15.9 Chemical Processing

Chemical plants often require precise control of pumps, fans, blowers, and process machinery.

Variable-speed operation can be used to match motor output to changing process requirements.

Because chemical-processing environments can have specific environmental and hazardous-area requirements, the complete installation must be evaluated rather than selecting the drive based only on motor power.

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16. Main Product Advantages

16.1 High Current Capacity

The 770 A rating gives the drive substantial capacity for large industrial motors.

This makes it suitable for applications that are well beyond the range of compact general-purpose drives.

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16.2 Multiple Duty Ratings

The 450 kW light-duty, 400 kW normal-duty, and 355 kW heavy-duty ratings provide flexibility during motor selection.

The same basic drive platform can therefore be applied to different load characteristics when the motor and process requirements fall within the appropriate rating.

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16.3 Embedded Industrial Networking

Embedded EtherNet/IP makes the drive suitable for integration into a networked automation architecture.

This reduces the need to treat the drive as an isolated motor-control device.

It can become part of the overall automation system.

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16.4 Large Industrial Frame

Frame 8 construction is designed for high-power applications.

The physical size is greater than smaller drive families, but the larger architecture allows the drive to support substantially higher current and motor power.

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16.5 Forced-Air Cooling

Forced-air cooling provides a practical thermal-management approach for high-power industrial equipment.

Proper airflow and maintenance are essential for reliable operation.

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16.6 MCC Integration

The 800 mm deep MCC-style construction makes the drive suitable for integration into larger electrical control systems.

This can be useful for centralized motor-control installations where multiple large drives are installed together.

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16.7 Flexible Application Range

The same basic drive platform can be used across many industrial sectors.

This includes:

• Water.
• Wastewater.
• Manufacturing.
• Mining.
• Cement.
• Pulp and paper.
• Chemical processing.
• Material handling.
• HVAC.
• Process industries.

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16.8 Controlled Acceleration

Large motors can create substantial mechanical stress when started directly across the line.

Variable-frequency operation allows the motor to accelerate in a controlled manner.

This can reduce mechanical shock to:

• Couplings.
• Gearboxes.
• Belts.
• Shafts.
• Pumps.
• Fans.
• Conveyors.

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17. Recommended Related Models

The following models are closely related to the specified 20G1ALC770AN0NNNNN. They are useful for comparison because they belong to the same PowerFlex 755 platform or closely related 400/480 V configurations.

Model	Voltage	Current	LD Rating	ND Rating	HD Rating	Frame	Main Configuration
20G1ALC650AN0NNNNN	400 VAC	650 A	400 kW	355 kW	315 kW	8	Air cooled, IP20, MCC style, no HIM
20G1ALC750AN0NNNNN	400 VAC	750 A	450 kW	400 kW	315 kW	8	Air cooled, IP20, MCC style, no HIM
20G1ALC770JN0NNNNN	400 VAC	770 A	450 kW	400 kW	355 kW	8	Air cooled, IP20, MCC style
20G1ALC770JN2NNNNN	400 VAC	770 A	450 kW	400 kW	355 kW	8	Air cooled, IP20, MCC style, local HIM
20G1ALD710AN0NNNNN	480 VAC	710 A	650 HP	600 HP	450 HP	8	Air cooled, IP20, MCC style, no HIM

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18. Related Model — 20G1ALC650AN0NNNNN

The 20G1ALC650AN0NNNNN is a lower-current 400 V member of the same PowerFlex 755 family.

It is rated at 650 A and provides approximately 400 kW light-duty, 355 kW normal-duty, and 315 kW heavy-duty capacity.

This model can be considered when the motor current is lower than the 770 A requirement.

Parameter	Specification
Model	20G1ALC650AN0NNNNN
Series	PowerFlex 755
Voltage	400 VAC
Current	650 A
Light Duty	400 kW
Normal Duty	355 kW
Heavy Duty	315 kW
Frame	8
Cooling	Forced Air
Installation	800 mm MCC Style
Enclosure	Type 1 / IP20
Communication	Embedded EtherNet/IP
HIM	Blank / No HIM
Dynamic Braking	None
Approx. Depth	800 mm
Approx. Weight	450–600 kg

This model is useful when the application does not require the full 770 A capacity.

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19. Related Model — 20G1ALC750AN0NNNNN

The 20G1ALC750AN0NNNNN is very close to the specified model electrically.

It uses a 750 A current rating and provides 450 kW light-duty, 400 kW normal-duty, and 315 kW heavy-duty ratings.

Parameter	Specification
Model	20G1ALC750AN0NNNNN
Series	PowerFlex 755
Voltage	400 VAC
Current	750 A
Light Duty	450 kW
Normal Duty	400 kW
Heavy Duty	315 kW
Frame	8
Cooling	Forced Air
Installation	800 mm MCC Style
Enclosure	Type 1 / IP20
Communication	Embedded EtherNet/IP
HIM	Blank / No HIM
Approx. Depth	800 mm
Approx. Weight	500–650 kg

Compared with the 770 A model, the 750 A version provides a similar light-duty and normal-duty power rating but has a lower heavy-duty rating.

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20. Related Model — 20G1ALC770JN0NNNNN

The 20G1ALC770JN0NNNNN is particularly relevant because it shares the same 770 A electrical capacity and 400 V class.

Its principal difference is the configuration of the operator interface and related catalog options.

Parameter	Specification
Model	20G1ALC770JN0NNNNN
Series	PowerFlex 755
Voltage	400 VAC
Current	770 A
Light Duty	450 kW
Normal Duty	400 kW
Heavy Duty	355 kW
Frame	8
Cooling	Forced Air
Installation	800 mm MCC Style
Enclosure	Type 1 / IP20
Communication	Embedded EtherNet/IP
HIM	Blank / No HIM configuration family
Approx. Depth	800 mm
Approx. Weight	500–650 kg

This is a useful comparison model when evaluating replacement or configuration changes within the same current and voltage class.

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21. Related Model — 20G1ALC770JN2NNNNN

The 20G1ALC770JN2NNNNN provides the same basic 770 A, 400 VAC electrical rating but adds a local handheld/interface configuration.

Parameter	Specification
Model	20G1ALC770JN2NNNNN
Series	PowerFlex 755
Voltage	400 VAC
Current	770 A
Light Duty	450 kW
Normal Duty	400 kW
Heavy Duty	355 kW
Frame	8
Cooling	Forced Air
Installation	800 mm MCC Style
Enclosure	Type 1 / IP20
Communication	Embedded EtherNet/IP
HIM	Enhanced LCD, Full Numeric, Handheld/Local HIM
Approx. Depth	800 mm
Approx. Weight	500–650 kg

The main practical difference is the user-interface arrangement.

For systems where technicians frequently need local access to parameters and diagnostic information, a local HIM-equipped configuration may be more convenient.

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22. Related Model — 20G1ALD710AN0NNNNN

The 20G1ALD710AN0NNNNN belongs to the same PowerFlex 755 family but is intended for the 480 VAC class.

Parameter	Specification
Model	20G1ALD710AN0NNNNN
Series	PowerFlex 755
Voltage	480 VAC
Current	710 A
Light Duty	650 HP
Normal Duty	600 HP
Heavy Duty	450 HP
Frame	8
Cooling	Forced Air
Installation	800 mm MCC Style
Enclosure	Type 1 / IP20
Communication	Embedded EtherNet/IP
HIM	Blank / No HIM
Approx. Depth	800 mm
Approx. Weight	500–650 kg

This model is relevant when the plant electrical system is based on approximately 480 VAC rather than the 400 VAC class.

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23. Five Same-Brand Popular Models

The following are representative Allen-Bradley variable-frequency drive models from other PowerFlex families.

Model	Series	Typical Voltage Class	Approx. Application Range	Main Use
25B-D010N104	PowerFlex 525	480 VAC class	Small/medium motors	General machine control
25C-D010N103	PowerFlex 527	480 VAC class	Small/medium motors	Machine automation
20F11NC2P1JA0NNNNN	PowerFlex 753	480 VAC class	Medium/large motors	Industrial machinery
20F11NC8P0JA0NNNNN	PowerFlex 753	480 VAC class	Medium/large motors	Process and machine control
20G1ALC770AN0NNNNN	PowerFlex 755	400 VAC	Up to 450 kW LD	Large industrial drives

The five models cover different application sizes, so they should not be considered direct electrical substitutes for one another.

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24. PowerFlex 525 Comparison

The PowerFlex 525 is a compact drive family intended primarily for smaller machines and general-purpose applications.

Compared with the 20G1ALC770AN0NNNNN, the physical size, current capacity, and motor-power range are dramatically smaller.

Parameter	25B-D010N104	20G1ALC770AN0NNNNN
Series	PowerFlex 525	PowerFlex 755
Voltage Class	480 VAC class	400 VAC
Application Size	Small/Medium	Large
Current Class	Low	770 A
Maximum Application Scale	Machine-level	Large industrial system
Cooling	Compact drive cooling	Forced air
Installation	Compact	MCC style
Communication	Industrial network capable	Embedded EtherNet/IP
Frame	Compact	Frame 8
Depth	Compact enclosure	800 mm MCC style
Weight	Low	Hundreds of kilograms

The PowerFlex 525 is therefore more appropriate for compact machinery, while the PowerFlex 755 770 A configuration is intended for large industrial systems.

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25. PowerFlex 527 Comparison

The PowerFlex 527 is another compact drive family aimed at machine automation.

Parameter	25C-D010N103	20G1ALC770AN0NNNNN
Series	PowerFlex 527	PowerFlex 755
General Application	Machine automation	Large industrial motor control
Voltage Class	480 VAC class	400 VAC
Current Capacity	Low-current class	770 A
Frame	Compact	Frame 8
Installation	Compact machine cabinet	MCC style
Cooling	Compact	Forced Air
Typical Motor Size	Small/Medium	Large
Communication	Industrial automation	Embedded EtherNet/IP

The two products serve very different motor-power ranges.

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26. PowerFlex 753 Comparison

The PowerFlex 753 is a larger industrial drive family and is therefore a more meaningful comparison with the PowerFlex 755.

The PowerFlex 753 platform is commonly used for general industrial motor-control applications.

Parameter	20F11NC2P1JA0NNNNN	20F11NC8P0JA0NNNNN
Series	PowerFlex 753	PowerFlex 753
Product Type	Industrial AC Drive	Industrial AC Drive
Application	General Industrial	General Industrial
Typical Use	Pumps, fans, conveyors	Process machinery, pumps, fans
Voltage Class	480 VAC class	480 VAC class
Drive Size	Medium/Large	Medium/Large
Network Integration	Available	Available
Local Interface	Configuration dependent	Configuration dependent

The PowerFlex 753 and PowerFlex 755 share the general concept of industrial AC motor control, but the PowerFlex 755 family is particularly suitable for higher-power applications and larger system architectures.

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27. Model Comparison Table

The following table provides a broader comparison of the most relevant models.

Model	Voltage	Current	LD	ND	HD	Frame	HIM	Depth
20G1ALC650AN0NNNNN	400 VAC	650 A	400 kW	355 kW	315 kW	8	No HIM	800 mm
20G1ALC750AN0NNNNN	400 VAC	750 A	450 kW	400 kW	315 kW	8	No HIM	800 mm
20G1ALC770AN0NNNNN	400 VAC	770 A	450 kW	400 kW	355 kW	8	No HIM	800 mm
20G1ALC770JN0NNNNN	400 VAC	770 A	450 kW	400 kW	355 kW	8	Configuration dependent	800 mm
20G1ALC770JN2NNNNN	400 VAC	770 A	450 kW	400 kW	355 kW	8	Local HIM	800 mm
20G1ALD710AN0NNNNN	480 VAC	710 A	650 HP	600 HP	450 HP	8	No HIM	800 mm

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28. Advantages for Centralized Automation

The 20G1ALC770AN0NNNNN is particularly suitable for centralized automation because the drive can operate as part of a larger control architecture.

A typical system may include:

• PLC.
• HMI.
• Industrial Ethernet network.
• Motor control center.
• Power distribution system.
• Multiple variable-frequency drives.
• Sensors.
• Flow transmitters.
• Pressure transmitters.
• Temperature transmitters.
• Process-control equipment.

The drive can receive speed or operating commands from the control system and return operating information to the controller.

This creates a more coordinated system than simply starting and stopping the motor with conventional contactors.

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29. Pump Control Advantages

For large pump applications, variable-speed control can provide several practical benefits.

The motor can be operated at different speeds according to process demand.

This can help:

• Reduce unnecessary throttling.
• Improve pressure control.
• Improve flow control.
• Reduce mechanical stress.
• Provide smoother starting.
• Reduce water hammer in suitable systems.
• Match pump output to process requirements.

For large pumps, even a relatively small reduction in operating speed can produce a meaningful change in system power consumption, depending on the pump and system characteristics.

The actual energy savings depend on the pump curve, system curve, operating point, motor efficiency, and process requirements.

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30. Conveyor Control Advantages

For conveyors, controlled acceleration can be more important than simple speed regulation.

A large conveyor may contain:

• Heavy belts.
• Large rollers.
• Gearboxes.
• Long material loads.
• Multiple drive stations.

Starting such a system abruptly can produce significant mechanical stress.

The variable-frequency drive can provide a controlled acceleration profile.

This can reduce sudden torque changes and make the entire mechanical system easier to manage.

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31. Fan and Blower Control Advantages

Fans and blowers often operate under variable process demand.

A fixed-speed motor may continue consuming substantial power even when full airflow is unnecessary.

Variable-speed operation allows the equipment to respond to actual process demand.

Typical control variables include:

• Air pressure.
• Airflow.
• Temperature.
• Furnace conditions.
• Building pressure.
• Process demand.

The drive can therefore become part of a closed-loop process-control strategy.

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32. Maintenance Considerations

A large industrial drive requires regular maintenance.

Important inspection points include:

Cooling Fans

Check fan operation and listen for unusual vibration or bearing noise.

A failing cooling fan can cause thermal problems even when the electrical portion of the drive remains functional.

Airflow

Make sure the airflow path is not blocked.

Dust, dirt, and accumulated debris can restrict cooling.

Electrical Connections

High-current terminals should be inspected according to the applicable maintenance procedure.

Loose connections can produce heat and localized electrical stress.

DC Bus Components

Large drives contain energy-storage components that require proper safety procedures before service.

Technicians must follow the appropriate isolation and discharge procedures before accessing internal components.

Control Electronics

Control boards and communication connections should be protected from contamination and electrostatic discharge.

Grounding

The protective grounding system should be maintained in good condition.

A proper grounding arrangement is important for both safety and reliable electrical operation.

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33. Installation Considerations

The installation of a 770 A drive should be treated as a major electrical-engineering project rather than a simple equipment replacement.

Important considerations include:

1. Incoming power capacity.
2. Short-circuit current rating.
3. Protection coordination.
4. Cable size.
5. Motor cable routing.
6. Grounding.
7. Cabinet ventilation.
8. Heat dissipation.
9. Physical access.
10. Maintenance clearance.
11. Network architecture.
12. Motor compatibility.
13. Environmental conditions.
14. Harmonic considerations.
15. Emergency-stop architecture.
16. Motor thermal protection.
17. Commissioning procedure.

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34. Cable and Power-System Considerations

A 770 A drive can require substantial input and motor conductors.

Cable selection should be based on the applicable electrical standards, installation method, ambient conditions, allowable temperature, voltage drop, short-circuit requirements, and manufacturer requirements.

The physical cable arrangement is also important.

Large cables have a significant bending radius.

This means the actual electrical compartment may need considerably more space than the drive itself.

The 800 mm depth should therefore not be treated as the complete cable-installation requirement.

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35. Motor Compatibility

The drive should be matched to the motor based on more than horsepower alone.

Important parameters include:

• Motor rated voltage.
• Motor rated current.
• Motor power.
• Motor frequency.
• Motor speed.
• Motor overload requirement.
• Motor insulation system.
• Cable length.
• Application torque profile.
• Starting requirements.

For this reason, a 400 kW motor cannot automatically be considered compatible simply because the drive has a 400 kW normal-duty rating.

The motor’s actual full-load current must be checked against the drive rating.

The duty category must also be evaluated.

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36. Selecting the Correct Duty Rating

The selection process can be summarized as follows.

Application Characteristic	Preferred Rating Consideration
Smooth centrifugal pump load	Light / Normal Duty
Large fan	Light / Normal Duty
Process pump	Normal Duty
Continuous blower	Normal Duty
Heavy conveyor	Heavy Duty
High starting torque	Heavy Duty
Crusher-type load	Heavy Duty
Mixer with high starting torque	Heavy Duty
Variable industrial process	Depends on actual load
Frequent acceleration/deceleration	Often Heavy Duty consideration

The final rating should always be determined from the actual motor nameplate data and load profile.

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37. Why the 20G1ALC770AN0NNNNN Is a High-Capacity Drive

The combination of:

• 770 A current,
• 400 VAC three-phase input,
• 450 kW light-duty rating,
• 400 kW normal-duty rating,
• 355 kW heavy-duty rating,
• Frame 8 construction,
• forced-air cooling,
• 800 mm MCC-style installation,

makes this a substantial industrial drive.

It is not intended to compete with compact machine-level drives.

Its purpose is to control large motors in industrial infrastructure and process systems.

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38. Practical Selection Summary

Selection Requirement	20G1ALC770AN0NNNNN
400 VAC System	Yes
Three-Phase Power	Yes
Large Motor	Yes
Up to 400 kW Normal Duty	Yes
Up to 450 kW Light Duty	Yes
Heavy-Duty Application	Up to 355 kW
770 A Current Class	Yes
Embedded EtherNet/IP	Yes
Forced-Air Cooling	Yes
MCC Installation	Yes
800 mm Deep Configuration	Yes
Local HIM Included	No
Dynamic Braking Included	No
DC Terminals	No
Type 1 / IP20	Yes
Filtered Configuration	Yes
CM Jumper	Removed

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39. Important Differences Between AN0, JN0 and JN2 Configurations

The model suffix should not be ignored when comparing PowerFlex 755 products.

Two drives can have very similar current and power ratings but different interface, EMC, enclosure, or accessory configurations.

For the 770 A 400 V family, examples include:

Model	Current	LD	ND	HD	Main Difference
20G1ALC770AN0NNNNN	770 A	450 kW	400 kW	355 kW	AN0 configuration, no HIM
20G1ALC770JN0NNNNN	770 A	450 kW	400 kW	355 kW	J-series configuration
20G1ALC770JN2NNNNN	770 A	450 kW	400 kW	355 kW	Local/handheld HIM configuration
20G1ALC770JN4NNNNN	770 A	450 kW	400 kW	355 kW	Alternate HIM/configuration option

Therefore, a replacement should be selected by comparing the complete catalog number rather than only the 770 A rating.

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40. Overall Product Advantages

The main advantages of the Allen-Bradley 20G1ALC770AN0NNNNN can be summarized as follows:

High power capacity: The 770 A current rating supports large industrial motors.

Flexible duty ratings: The drive can be applied at different power levels depending on light-, normal-, or heavy-duty requirements.

400 VAC compatibility: It fits the common 400 V three-phase industrial power class.

Industrial communication: Embedded EtherNet/IP supports integration into automated control systems.

Large Frame 8 architecture: The physical platform is designed for high-power industrial applications.

Forced-air cooling: Suitable for high-power operation when properly ventilated.

MCC-style installation: The 800 mm deep configuration can be integrated into large motor-control assemblies.

Controlled motor acceleration: Useful for reducing mechanical stress during motor starting.

Variable-speed operation: Allows process equipment to respond to changing load demand.

Broad application range: Suitable for pumps, fans, blowers, conveyors, water systems, mining equipment, process machinery, and other large industrial loads.

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41. Final Technical Summary

Category	Final Specification
Model	20G1ALC770AN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product	AC Drive
Voltage	400 VAC
Phase	3 Phase
Current	770 A
Light Duty	450 kW
Normal Duty	400 kW
Heavy Duty	355 kW
Frame	8
Cooling	Forced Air
Input	AC Input with Precharge
DC Terminals	None
Enclosure	Type 1 / IP20
Installation	800 mm Deep MCC Style
Communication	Embedded EtherNet/IP
EMC	Filtered
CM Jumper	Removed
Dynamic Braking	None
HIM	Blank / No HIM
Approx. Width	600 mm
Approx. Height	2,000–2,400 mm
Approx. Depth	800 mm
Approx. Weight	500–650 kg
Main Applications	Pumps, fans, blowers, conveyors, water treatment, mining, cement, process industries
Primary Advantage	High-capacity industrial motor control

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42. Conclusion

The Allen-Bradley 20G1ALC770AN0NNNNN is a high-capacity PowerFlex 755 AC drive intended for large industrial motor-control systems.

Its 770 A current rating, 400 VAC three-phase input, 450 kW light-duty capacity, 400 kW normal-duty capacity, and 355 kW heavy-duty capacity place it in the high-power industrial-drive category.

The Frame 8 architecture and 800 mm deep MCC-style construction are intended for substantial industrial electrical installations rather than compact machine cabinets.

The embedded EtherNet/IP capability makes the drive suitable for integration with industrial automation systems, allowing motor operation and drive information to become part of a larger control strategy.

Its forced-air cooling system is appropriate for the high thermal load associated with this class of drive, provided that the cabinet ventilation and environmental conditions are properly managed.

The absence of a local HIM in the AN0 configuration makes the model particularly suitable for installations where operation and monitoring are handled through a centralized automation system.

The drive can be applied to large pumps, fans, blowers, conveyors, water-treatment equipment, mining machinery, cement equipment, process systems, and other large industrial machines.

For replacement or new-project selection, the most important points are not only the 770 A rating and 400 VAC voltage. Engineers should also verify the motor full-load current, duty cycle, overload requirement, installation arrangement, enclosure requirements, communication architecture, cooling requirements, cable system, braking requirements, and the exact suffix configuration.

When comparing alternatives, the closely related 20G1ALC650AN0NNNNN, 20G1ALC750AN0NNNNN, 20G1ALC770JN0NNNNN, 20G1ALC770JN2NNNNN, and 20G1ALD710AN0NNNNN provide useful reference points across different current levels, voltage classes, and interface configurations.

For practical engineering work, the 20G1ALC770AN0NNNNN can therefore be regarded as a large-frame, high-current, 400 V PowerFlex 755 drive designed for demanding industrial variable-speed motor applications where high electrical capacity, controlled motor operation, and integration with a plant automation system are required.