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Allen-Bradley 20G1ALF370AN0NNNNN PowerFlex 755 AC Drive

1. Product Overview

The Allen-Bradley 20G1ALF370AN0NNNNN is a high-power PowerFlex 755 AC variable frequency drive designed for large three-phase industrial motor applications.

It is a 690 VAC, 370 A, Frame 8 drive intended for applications requiring substantial motor power, adjustable speed, controlled acceleration and deceleration, torque control, process regulation, and industrial network communication.

The drive is air cooled and uses an MCC-style IP20 / NEMA Type 1 construction. It includes embedded EtherNet/IP communication, AC input with precharge, no external DC terminals, and a filtered input configuration.

The 370 A rating places this model in the high-power section of the PowerFlex 755 range. Its application ratings are approximately 400 kW for light-duty operation, 355 kW for normal-duty operation, and 300 kW for heavy-duty operation.

This combination makes the 20G1ALF370AN0NNNNN suitable for large pumps, fans, blowers, conveyors, compressors, mixers, process machinery, material-handling equipment, and other high-power industrial loads.

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2. Brand and Product Series

Item	Description
Brand	Allen-Bradley
Product Series	PowerFlex 755
Product Family	PowerFlex 750-Series
Product Type	AC Variable Frequency Drive
Model	20G1ALF370AN0NNNNN
Voltage Class	690 VAC
Input	Three-phase AC
Rated Current	370 A
Frame Size	Frame 8
Cooling	Air cooled / forced air
Communication	Embedded EtherNet/IP
Input Configuration	AC input with precharge
External DC Terminals	None
Enclosure Configuration	Type 1 / IP20, 800 mm deep MCC-style
Filtering	Filtered
CM Jumper	Removed in the specified AN0 configuration
Dynamic Braking	None
HIM	Blank / no HIM
Main Function	High-power variable-speed motor control

The PowerFlex 755 family is designed for large industrial motor-control systems where speed, torque, process control, diagnostics, and automation-network integration are important.

The 20G1ALF370AN0NNNNN is specifically positioned in the 690 VAC Frame 8 group and provides more current capacity than the 265 A and 330 A versions while remaining below the higher-current 415 A, 460 A, and 500 A configurations.

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3. Main Technical Parameters

Parameter	Specification
Model	20G1ALF370AN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Drive Type	AC Variable Frequency Drive
Input Voltage	690 VAC
Input Phase	Three Phase
Output Current	370 A
Light-Duty Rating	400 kW
Normal-Duty Rating	355 kW
Heavy-Duty Rating	300 kW
Frame	Frame 8
Cooling	Forced Air
Communication	Embedded EtherNet/IP
Input Type	AC Input with Precharge
External DC Terminals	None
Enclosure	Type 1 / IP20 MCC Style
MCC Depth	800 mm
Filtering	Filtered
CM Jumper	Removed
Dynamic Braking	None
HIM	Blank / No HIM
Motor Type	Three-Phase AC Motor
Typical Application	High-power industrial motor control
Approx. Height	2450 mm class
Approx. Width	600 mm class
Approx. Depth	800 mm
Approx. Weight	Approximately 620–625 kg class

The 690 VAC, 370 A, 400/355/300 kW rating structure and 800 mm-deep MCC-style configuration are consistent with the identified model family.

The dimensions and weight should be treated as engineering planning values, not as a substitute for the final mechanical drawing of the exact ordered assembly. Frame 8 equipment can vary in actual shipping weight and overall dimensions depending on the complete configuration and installed options.

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4. Electrical Rating

The 20G1ALF370AN0NNNNN is designed for a 690 VAC three-phase electrical system.

Its rated output current is 370 A.

The available application ratings are:

Duty	Power Rating	Typical Load Characteristic
Light Duty	400 kW	Variable-torque / lower overload applications
Normal Duty	355 kW	General industrial operation
Heavy Duty	300 kW	Higher overload and torque requirements

The duty rating is an important part of drive selection.

A motor should not be matched to the drive solely by comparing the motor’s kW value with the drive’s maximum kW rating.

The motor full-load current, overload requirements, acceleration time, speed range, load characteristics, ambient temperature, altitude, and operating cycle should all be considered.

For applications with high starting torque or frequent overload operation, the heavy-duty rating is particularly important.

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5. 370 A Output Capacity

The 370 A output rating is one of the defining characteristics of the 20G1ALF370AN0NNNNN.

This current capacity allows the drive to control large industrial motors where lower-current PowerFlex configurations would not provide sufficient capacity.

A higher current rating can be important for applications with:

• Large motor power
• High starting torque
• Heavy mechanical loads
• Long acceleration periods
• High inertia
• Variable process loads
• Frequent load changes
• Constant-torque operation

The actual motor current should always remain within the applicable drive duty rating.

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6. 690 VAC High-Power System

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

At high motor power levels, using a higher motor voltage can reduce the current required for a given power level compared with a lower-voltage motor system.

This can influence conductor sizing, distribution equipment, switchgear selection, and overall electrical-system design.

The 20G1ALF370AN0NNNNN is therefore particularly suitable for industrial installations where 690 VAC motors are already part of the electrical architecture.

Before installation, the complete incoming power system should be checked for voltage, frequency, grounding, short-circuit capacity, protection, isolation, and motor compatibility.

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7. Light-Duty Rating – 400 kW

The light-duty rating is approximately 400 kW.

Light-duty operation is normally associated with applications where the motor does not require the same level of continuous overload capability as a demanding constant-torque application.

Typical examples can include large centrifugal:

• Pumps
• Fans
• Blowers
• Cooling equipment
• Ventilation systems

The exact suitability depends on the motor current and the application’s overload profile.

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8. Normal-Duty Rating – 355 kW

The normal-duty rating is approximately 355 kW.

This rating provides a useful reference for general industrial applications where the motor load varies during operation but does not require the higher overload capability associated with heavy-duty operation.

Possible applications include:

• Industrial pumps
• Large fans
• Conveyors
• Process equipment
• Material-handling machinery
• Industrial ventilation
• General-purpose production equipment

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9. Heavy-Duty Rating – 300 kW

The heavy-duty rating is approximately 300 kW.

Heavy-duty operation is relevant when the application requires higher torque or greater overload capability.

Examples can include:

• Heavy conveyors
• Mixers
• Agitators
• Material-handling systems
• High-inertia machinery
• Certain compressors
• Process machinery with demanding acceleration

The motor current and overload requirements should be checked carefully before selecting this drive for a heavy-duty application.

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10. Product Introduction

The Allen-Bradley 20G1ALF370AN0NNNNN is a high-power AC drive intended to regulate the speed and torque of large industrial motors.

Instead of operating the motor at a fixed frequency, the drive produces a controlled variable-frequency output.

This allows motor speed to be adjusted according to the process requirement.

For a pump, this can mean changing flow by adjusting motor speed.

For a fan, it can mean changing airflow.

For a conveyor, it can mean adjusting material-handling speed.

For a mixer, it can mean changing mixing speed according to the process stage.

For a compressor, it can allow motor operation to follow changing production requirements.

This flexibility makes variable-frequency control useful in many industrial environments.

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11. Air-Cooled Construction

The drive uses forced-air cooling.

At a power level of 370 A, thermal management is an important part of the installation.

The cooling system requires sufficient airflow through the equipment.

The installation area should therefore be kept clean and should not expose the drive to excessive dust, conductive particles, oil mist, corrosive gases, moisture, or other contaminants.

Ventilation openings should not be blocked.

Hot exhaust air should not be allowed to circulate continuously back into the drive’s cooling-air path.

The electrical room or MCC lineup should therefore be designed with adequate ventilation and heat-removal capacity.

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12. Frame 8 Construction

The 20G1ALF370AN0NNNNN uses Frame 8 construction.

Frame 8 is designed for high-power PowerFlex 755 applications.

Compared with smaller drive frames, this configuration requires significantly more physical space and mechanical support.

The approximately 620–625 kg class weight also means that transportation and installation need to be planned carefully.

The floor structure, lifting equipment, equipment access route, cabinet arrangement, and service clearance should be evaluated before delivery.

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13. Dimensions and Weight

The following values are suitable as preliminary planning figures for the specified Frame 8 MCC-style arrangement.

Mechanical Parameter	Approximate Specification
Model	20G1ALF370AN0NNNNN
Frame	8
Enclosure Style	Type 1 / IP20
MCC Style	800 mm deep
Approx. Height	2450 mm
Approx. Width	600 mm
Approx. Depth	800 mm
Approx. Weight	620–625 kg
Cooling	Forced Air
Installation	Industrial floor / MCC-style
Service Access	Required

The 800 mm depth is especially important when designing the equipment room or MCC lineup.

Adequate clearance should be provided for power cables, control cables, ventilation, maintenance, component removal, and safe working access.

The weight should also be considered when checking floor loading and lifting requirements.

For final mechanical design, use the exact dimensional drawing associated with the complete ordered configuration.

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14. Embedded EtherNet/IP Communication

Embedded EtherNet/IP communication is an important feature of the drive.

The drive can be incorporated into a networked industrial automation system where the control system communicates with the motor drive.

Depending on the control architecture, information such as the following can be exchanged:

• Speed reference
• Actual speed
• Motor current
• Drive status
• Fault information
• Warning information
• Control commands
• Operating parameters

This makes the drive suitable for centralized motor-control systems.

In a large factory, multiple PowerFlex drives can be connected to an industrial network so that operators can monitor and control different motors from a centralized automation system.

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15. AC Input with Precharge

The specified configuration uses AC input with precharge.

The precharge circuit controls the initial charging of the DC bus capacitors.

This is particularly important in high-power drives because the DC bus contains substantial stored electrical energy.

Controlled precharge helps manage the initial charging process and provides a structured startup sequence for the drive’s power section.

The incoming electrical system still requires correctly selected protection and isolation equipment.

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16. No External DC Terminals

The specified configuration does not provide external DC terminals.

This means it is primarily intended to operate as an AC-input drive rather than as a drive supplied from an external common DC bus.

For installations requiring common DC bus architecture, the exact drive configuration should be reviewed before selecting the equipment.

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17. Filtered Configuration

The 20G1ALF370AN0NNNNN is a filtered configuration.

Filtering is useful for managing conducted electrical noise generated by the switching operation of a variable-frequency drive.

However, filtering does not replace proper installation practices.

Good system design should also consider:

• Grounding
• Shielding
• Motor cable construction
• Cable routing
• Separation of power and control cables
• Cabinet bonding
• Motor insulation
• Network cable routing
• Cable length

Correct installation is particularly important in large industrial plants where many electrical and electronic systems operate close together.

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18. CM Jumper Removed

The specified AN0 configuration is identified with the CM jumper removed.

This configuration detail should be considered during system installation because common-mode and grounding behavior can be affected by the exact drive configuration.

The grounding arrangement of the complete system should be reviewed together with the drive, transformer, motor, motor cable, and plant electrical system.

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19. No Dynamic Braking

The specified configuration does not include a dynamic braking transistor.

This is an important consideration for applications involving rapid deceleration or high regenerative energy.

During deceleration, a motor can return energy to the drive’s DC bus.

If the application contains substantial rotating inertia or requires frequent rapid stopping, the braking strategy should be evaluated during engineering.

Possible system-level approaches may include:

• Longer controlled deceleration
• Mechanical braking
• Regenerative equipment
• Application-specific braking arrangements

The correct solution depends on the amount of regenerative energy and the required stopping time.

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20. Blank / No HIM Configuration

The specified model is configured without a standard HIM.

This means the drive is well suited to installations where operation and monitoring are primarily handled through a control system, network, or external interface.

A blank configuration can also be appropriate when the drive is installed inside an MCC or electrical room and does not require local operator control directly on the drive enclosure.

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21. Typical Pump Applications

The 20G1ALF370AN0NNNNN is well suited to large pump systems.

Typical applications include:

• Water treatment
• Industrial water circulation
• Cooling-water systems
• Process-water systems
• Mining water systems
• Irrigation systems
• Utility pumping
• Large circulation pumps
• Chemical process pumping

Variable-speed control allows the pump motor speed to be adjusted according to process demand.

This can improve flow control and reduce the need for mechanical throttling.

For variable-torque pump applications, reducing motor speed can also significantly reduce the mechanical power required.

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22. Fan and Blower Applications

Large fans and blowers can require hundreds of kilowatts of motor power.

The drive can regulate fan speed according to airflow demand.

Typical applications include:

• Industrial ventilation
• Exhaust systems
• Cooling towers
• Furnace air systems
• Combustion air systems
• Dust collection
• Industrial drying
• Process ventilation
• Large air-handling equipment

A variable-speed fan system can reduce unnecessary operation at full speed when the process does not require maximum airflow.

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23. Conveyor Applications

The drive is also suitable for large conveyor systems.

A controlled acceleration profile can reduce mechanical shock during startup.

This can be beneficial for:

• Conveyor belts
• Rollers
• Gearboxes
• Couplings
• Shafts
• Mechanical structures
• Material being transported

Variable speed also allows the conveyor to be coordinated with other production equipment.

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24. Compressor Applications

Large compressors can require substantial motor current and controlled acceleration.

The 20G1ALF370AN0NNNNN can be considered for high-power compressor systems where the motor rating and compressor operating envelope match the drive’s capabilities.

Typical applications include:

• Industrial air compressors
• Process compressors
• Utility compressor systems
• Large refrigeration-related machinery
• Production compressors

Compressor selection should consider minimum speed, maximum speed, acceleration, motor cooling, pressure requirements, torque characteristics, and compressor-specific operating restrictions.

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25. Mixer and Agitator Applications

Large mixers and agitators can require considerable starting torque.

The drive can provide controlled acceleration and adjustable operating speed.

Potential applications include:

• Chemical mixing
• Slurry processing
• Water treatment
• Mineral processing
• Industrial batch processing
• Tank agitation
• Process mixing

The appropriate drive duty rating should be determined from actual motor current and torque requirements.

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26. Material-Handling Applications

Large material-handling systems can benefit from controlled motor speed.

Applications can include:

• Bulk material conveyors
• Mining conveyors
• Industrial transfer systems
• Large feeders
• Material-processing systems
• Heavy production machinery

Controlled acceleration can reduce sudden torque application to belts, gears, couplings, and other mechanical components.

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27. Process Machinery Applications

The drive can be used in a wide range of process machinery where motor speed is an important operating parameter.

Examples include:

• Production machinery
• Continuous-process equipment
• Material-processing systems
• Industrial auxiliary systems
• Large mechanical systems
• Manufacturing machinery
• Process pumps
• Large fans and blowers

The main advantage is the ability to adjust motor speed according to the actual process requirement.

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28. Main Product Advantages

High Current Capacity

The 370 A output rating provides substantial capacity for large industrial motors.

This allows the drive to be used in applications where smaller PowerFlex configurations would not have sufficient current capacity.

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690 VAC Operation

The 690 VAC voltage class makes the drive appropriate for high-power motor systems.

This is particularly useful in industrial plants using 690 VAC motors and distribution systems.

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Flexible Duty Ratings

The 400 kW light-duty, 355 kW normal-duty, and 300 kW heavy-duty ratings allow the same general drive platform to be considered for different types of mechanical loads.

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Industrial Network Integration

Embedded EtherNet/IP provides a direct communication path to an industrial control network.

This can simplify centralized motor control and monitoring.

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Controlled Motor Starting

The drive can gradually accelerate the motor rather than applying the full operating condition immediately.

This can reduce mechanical shock and electrical starting stress.

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Adjustable Motor Speed

The motor can operate at a speed appropriate to the actual process.

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

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Process Regulation

The drive can be used as part of a larger process-control system.

Motor speed can become an adjustable process variable.

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29. Energy Management

Variable-frequency control can reduce energy consumption in applications where the motor does not need to operate continuously at full speed.

This is particularly relevant to centrifugal pumps and fans.

For these loads, reducing speed can produce a substantial reduction in mechanical power demand.

The actual energy savings depend on:

• Load profile
• Operating hours
• Motor efficiency
• Pump or fan characteristics
• Required flow
• Required pressure
• System resistance
• Speed range
• Control strategy

Therefore, energy performance should always be evaluated using the actual application data.

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30. Motor Protection and Monitoring

The drive provides a range of operating and diagnostic information that can assist with motor-system monitoring.

Depending on the configured control system, personnel may monitor:

• Motor current
• Output frequency
• Speed
• Drive status
• Fault conditions
• Warning conditions
• Operating parameters
• Communication status

This information can simplify troubleshooting compared with a basic motor starter that provides only run/stop functionality.

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31. Maintenance Advantages

A networked variable-frequency drive can provide useful operating information for maintenance teams.

Maintenance personnel can use drive status and diagnostic information to investigate problems involving:

• Motor overload
• Overcurrent
• Overtemperature
• Communication problems
• Abnormal operating conditions
• Excessive load
• Cooling problems
• Electrical faults

Regular maintenance should include inspection of cooling airflow, fans, electrical connections, cabinet cleanliness, motor cables, grounding, and network connections.

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32. Environmental Considerations

The IP20 / NEMA Type 1 MCC-style construction is intended for a controlled industrial electrical environment.

The drive should be protected from:

• Direct water
• Excessive moisture
• Conductive dust
• Corrosive gases
• Excessive oil contamination
• Foreign conductive material

The surrounding cabinet or electrical room should provide adequate environmental protection.

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33. Installation Considerations

Because the 20G1ALF370AN0NNNNN is a large Frame 8 drive, installation should be planned before equipment delivery.

Important considerations include:

• Floor loading
• Lifting equipment
• Equipment-room access
• Cabinet dimensions
• Cable-entry locations
• Ventilation
• Heat removal
• Service clearance
• Motor cable routing
• Grounding
• Network cabling
• Upstream protection

The approximately 620–625 kg equipment weight should be considered during transportation and installation planning.

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34. Motor Selection

Motor selection should be based on actual electrical and mechanical requirements.

Important motor data includes:

Motor Parameter	Selection Consideration
Motor Voltage	Must match the drive and system
Motor Current	Must be within applicable drive rating
Motor Power	Compare with correct duty rating
Motor Frequency	Verify operating frequency
Motor Speed	Verify required speed range
Starting Torque	Important for heavy loads
Continuous Torque	Important for constant-torque applications
Overload	Compare with drive duty rating
Acceleration	Check required acceleration time
Deceleration	Check regenerative energy
Cooling	Verify motor cooling at low speed
Insulation	Suitable for variable-frequency operation

The motor nameplate current is particularly important.

A motor with a nominal power below the drive’s kW rating can still require careful evaluation if its current or overload characteristics are unusual.

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35. Recommended Same-Series or Closely Related Models

The following models are closely related 690 VAC PowerFlex 755 configurations and provide useful alternatives around the 370 A rating. Their current and duty ratings are from the same high-power configuration group.

Model	Voltage	Current	Light Duty	Normal Duty	Heavy Duty	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 are useful when the motor current changes but the application remains within the same general 690 VAC high-power drive platform.

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36. Related Model – 20G1ALF265AN0NNNNN

The 20G1ALF265AN0NNNNN is a lower-current configuration in the same 690 VAC Frame 8 family.

Parameter	Specification
Model	20G1ALF265AN0NNNNN
Series	PowerFlex 755
Voltage	690 VAC
Current	265 A
Light Duty	315 kW
Normal Duty	250 kW
Heavy Duty	200 kW
Frame	8
Cooling	Air Cooled
Communication	Embedded EtherNet/IP
Input	AC with Precharge
External DC Terminals	None
Enclosure	Type 1 / IP20 MCC Style
MCC Depth	800 mm
Approx. Dimensions	2450 × 600 × 800 mm class
Approx. Weight	620–625 kg class

This model is suitable when the motor current requirement is below the 370 A capacity of the target model.

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37. Related Model – 20G1ALF330AN0NNNNN

The 20G1ALF330AN0NNNNN is the next lower-current configuration in the same group.

Parameter	Specification
Model	20G1ALF330AN0NNNNN
Series	PowerFlex 755
Voltage	690 VAC
Current	330 A
Light Duty	355 kW
Normal Duty	315 kW
Heavy Duty	250 kW
Frame	8
Cooling	Air Cooled
Communication	Embedded EtherNet/IP
Input	AC with Precharge
Enclosure	Type 1 / IP20 MCC Style
MCC Depth	800 mm
Approx. Dimensions	2450 × 600 × 800 mm class
Approx. Weight	620–625 kg class

This configuration can be considered for motors requiring less current than the 370 A model.

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38. Related Model – 20G1ALF415AN0NNNNN

The 20G1ALF415AN0NNNNN provides a higher current rating than the target model.

Parameter	Specification
Model	20G1ALF415AN0NNNNN
Series	PowerFlex 755
Voltage	690 VAC
Current	415 A
Light Duty	450 kW
Normal Duty	400 kW
Heavy Duty	355 kW
Frame	8
Cooling	Air Cooled
Communication	Embedded EtherNet/IP
Input	AC with Precharge
External DC Terminals	None
Enclosure	Type 1 / IP20 MCC Style
MCC Depth	800 mm
Approx. Dimensions	2450 × 600 × 800 mm class
Approx. Weight	620–625 kg class

This model can be considered when the motor requires additional current capacity above 370 A.

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39. Related Model – 20G1ALF460AN0NNNNN

The 20G1ALF460AN0NNNNN provides another higher-current option.

Parameter	Specification
Model	20G1ALF460AN0NNNNN
Series	PowerFlex 755
Voltage	690 VAC
Current	460 A
Light Duty	500 kW
Normal Duty	450 kW
Heavy Duty	375 kW
Frame	8
Cooling	Air Cooled
Communication	Embedded EtherNet/IP
Input	AC with Precharge
External DC Terminals	None
Enclosure	Type 1 / IP20 MCC Style
MCC Depth	800 mm
Approx. Dimensions	2450 × 600 × 800 mm class
Approx. Weight	620–625 kg class

It is appropriate to consider this configuration when the required motor current is significantly higher than 370 A.

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40. Related Model – 20G1ALF500AN0NNNNN

The 20G1ALF500AN0NNNNN is a higher-current configuration in the same 690 VAC Frame 8 family.

Parameter	Specification
Model	20G1ALF500AN0NNNNN
Series	PowerFlex 755
Voltage	690 VAC
Current	500 A
Light Duty	530 kW
Normal Duty	500 kW
Heavy Duty	400 kW
Frame	8
Cooling	Air Cooled
Communication	Embedded EtherNet/IP
Input	AC with Precharge
External DC Terminals	None
Enclosure	Type 1 / IP20 MCC Style
MCC Depth	800 mm
Approx. Dimensions	2450 × 600 × 800 mm class
Approx. Weight	620–625 kg class

This model provides additional capacity for applications requiring a larger motor current than the 370 A configuration.

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41. Five Same-Brand Reference Models

Rather than treating “popular” as a formal ranking, the following five Allen-Bradley PowerFlex models are useful reference points when comparing different PowerFlex 755 voltage and current ranges.

Model	Series	Voltage Class	Current	Frame	Duty / Application Reference
20G1ANF061JN0NNNNN	PowerFlex 755	690 VAC	61 A	6	Medium-power motor control
20G1ANF082JN0NNNNN	PowerFlex 755	690 VAC	82 A	6	Pumps, fans, conveyors
20G1ANF098JN0NNNNN	PowerFlex 755	690 VAC	98 A	6	Process machinery
20G1ALE295AN0NNNNN	PowerFlex 755	600 VAC class	295 A	8	Large industrial motors
20G1ALE355AN0NNNNN	PowerFlex 755	600 VAC class	355 A	8	Large industrial motor systems

The 61 A, 82 A, and 98 A 690 VAC configurations are documented within the PowerFlex 755 range, while the 295 A and 355 A configurations provide useful comparison points in the 600 VAC class.

These should not be treated as direct replacements for the 20G1ALF370AN0NNNNN because voltage class, current rating, enclosure, frame, motor duty, and installation requirements differ.

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42. Main 690 VAC Model Comparison

Model	Current	Light Duty	Normal Duty	Heavy Duty	Voltage	Frame
20G1ALF265AN0NNNNN	265 A	315 kW	250 kW	200 kW	690 VAC	8
20G1ALF330AN0NNNNN	330 A	355 kW	315 kW	250 kW	690 VAC	8
20G1ALF370AN0NNNNN	370 A	400 kW	355 kW	300 kW	690 VAC	8
20G1ALF415AN0NNNNN	415 A	450 kW	400 kW	355 kW	690 VAC	8
20G1ALF460AN0NNNNN	460 A	500 kW	450 kW	375 kW	690 VAC	8
20G1ALF500AN0NNNNN	500 A	530 kW	500 kW	400 kW	690 VAC	8

This comparison shows the progression of current and power capacity within the same general 690 VAC Frame 8 group.

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43. Application Comparison

Application	Suitability	Main Reason
Large Pump	High	Variable-speed flow and pressure control
Large Fan	High	Adjustable airflow
Blower	High	Process air regulation
Conveyor	High	Controlled acceleration and speed
Compressor	High	Adjustable motor operation
Mixer	High	Speed and torque control
Agitator	High	Adjustable process speed
Water Treatment	High	Pump and blower control
Mining	High	Large industrial motors
Material Handling	High	High-power conveyor systems
Process Machinery	High	Flexible motor speed control
Small Motor	Low	Drive capacity is excessive for the application

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44. Advantages for Pump Systems

For large pump systems, the drive can regulate motor speed according to actual process requirements.

This can reduce the need to run the pump continuously at full speed.

Potential benefits include:

• Adjustable flow
• Adjustable pressure
• Controlled acceleration
• Controlled stopping
• Reduced mechanical shock
• Improved process regulation
• Network monitoring
• Centralized control

For variable-torque pump applications, operating at a lower speed can also reduce energy consumption.

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45. Advantages for Fan Systems

Large fans often operate under changing airflow requirements.

The drive allows fan speed to be adjusted according to the process demand.

Potential benefits include:

• Variable airflow
• Soft starting
• Reduced mechanical stress
• Adjustable operating speed
• Process automation
• Remote control
• Fault monitoring
• Reduced unnecessary full-speed operation

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46. Advantages for Conveyor Systems

Large conveyors can experience considerable mechanical stress during startup.

A variable-frequency drive allows acceleration to be programmed.

This can reduce sudden torque transmission through the drive train.

Benefits can include:

• Smooth starting
• Reduced belt shock
• Reduced gearbox stress
• Adjustable speed
• Process synchronization
• Controlled stopping
• Improved material handling

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47. Advantages for Process Machinery

Process machinery often requires different operating speeds during different stages of production.

The drive provides an adjustable motor-speed variable.

This can be used for:

• Production-rate control
• Flow control
• Mixing control
• Material movement
• Ventilation
• Pumping
• Process synchronization

This flexibility can simplify machine-control design.

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48. High-Inertia Load Considerations

Large motors connected to high-inertia machinery can store significant mechanical energy.

During deceleration, this energy can return to the drive.

The specified configuration does not include a dynamic braking transistor.

Therefore, applications involving frequent rapid stopping should be evaluated carefully.

The required deceleration time and regenerated energy should be calculated before final equipment selection.

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49. Control-System Advantages

The drive can become part of a larger automation system.

A typical architecture can be represented as:

Operator Interface → Control System → EtherNet/IP Network → PowerFlex 755 → Motor

This arrangement can allow operators and maintenance personnel to monitor motor operation from a centralized control station.

It also reduces the need for some individual hardwired control circuits.

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50. Maintenance and Troubleshooting

The drive can provide useful information for maintenance personnel.

Typical information can include:

• Motor current
• Output frequency
• Motor speed
• Drive status
• Fault codes
• Warning conditions
• Network status
• Operating parameters

This information can help maintenance teams identify whether a problem is related to the electrical system, motor, mechanical load, cooling system, or communication network.

Routine inspection should include cooling fans, airflow, electrical connections, grounding, motor cables, cabinet cleanliness, and network connections.

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51. Mechanical Installation Requirements

The 20G1ALF370AN0NNNNN is a large Frame 8 device.

Installation planning should therefore include:

• Floor loading
• Lifting capacity
• Transportation route
• Door dimensions
• Cabinet access
• Service clearance
• Ventilation
• Cable routing
• Maintenance access
• Heat dissipation

The approximately 620–625 kg class equipment weight makes suitable lifting equipment necessary.

The drive should not be treated as a small cabinet-mounted component that can be manually positioned.

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52. Electrical Installation Requirements

The electrical installation should be designed around the actual drive and motor ratings.

Important items include:

• Incoming power conductors
• Protective devices
• Disconnect equipment
• Grounding conductors
• Motor cables
• Control cables
• Network cables
• Cabinet ventilation
• Motor protection
• Short-circuit protection

Cable sizes should be selected according to current, installation method, ambient conditions, cable length, insulation requirements, and applicable electrical standards.

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53. Motor Cable and EMC Considerations

A variable-frequency drive produces high-frequency switching waveforms.

The motor cable therefore becomes an important part of the complete electrical system.

Good installation practice includes consideration of:

• Cable shielding
• Grounding
• Cable length
• Cable separation
• Motor insulation
• Common-mode current
• Reflected-wave voltage
• Output filtering where required
• Routing away from sensitive signal cables

These considerations become more important as motor power and cable length increase.

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54. Recommended Application Areas

The 20G1ALF370AN0NNNNN can be considered for:

Water and Wastewater

Large pumps, lift stations, circulation systems, aeration blowers, and process-water equipment.

Mining

Large conveyors, pumps, fans, blowers, and material-processing equipment.

Manufacturing

Large production machines, process equipment, conveyors, and plant utility systems.

Chemical Processing

Pumps, mixers, agitators, blowers, and other process machinery.

Metals and Materials

Large fans, conveyors, pumps, material-handling systems, and auxiliary equipment.

Power and Utilities

Large pumps, cooling systems, ventilation systems, and auxiliary machinery.

General Industry

Any large industrial application requiring controlled operation of a 690 VAC three-phase motor within the drive’s duty ratings.

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55. Detailed Product Specification Summary

Specification	20G1ALF370AN0NNNNN
Brand	Allen-Bradley
Product Series	PowerFlex 755
Product Family	PowerFlex 750-Series
Product Type	AC Variable Frequency Drive
Input Voltage	690 VAC
Phase	Three Phase
Output Current	370 A
Light Duty	400 kW
Normal Duty	355 kW
Heavy Duty	300 kW
Frame	8
Cooling	Forced Air
Communication	Embedded EtherNet/IP
Input Configuration	AC Input with Precharge
External DC Terminals	None
Enclosure	Type 1 / IP20
MCC Style	800 mm Deep
Filtering	Filtered
CM Jumper	Removed
Dynamic Braking	None
HIM	Blank / No HIM
Approx. Height	2450 mm
Approx. Width	600 mm
Approx. Depth	800 mm
Approx. Weight	620–625 kg
Typical Motor	Large Three-Phase AC Motor
Main Applications	Pumps, Fans, Blowers, Conveyors, Compressors, Mixers, Process Machinery
Installation	Industrial MCC / Floor-Mounted
Control	Variable Speed and Torque Control

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56. Quick Reference – Five Closely Related Models

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

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57. Quick Reference – Five Same-Brand Models

Model	Series	Voltage	Current	Frame	Typical Use
20G1ANF061JN0NNNNN	PowerFlex 755	690 VAC	61 A	6	Medium-power motors
20G1ANF082JN0NNNNN	PowerFlex 755	690 VAC	82 A	6	Pumps and fans
20G1ANF098JN0NNNNN	PowerFlex 755	690 VAC	98 A	6	Process machinery
20G1ALE295AN0NNNNN	PowerFlex 755	600 VAC class	295 A	8	Large motors
20G1ALE355AN0NNNNN	PowerFlex 755	600 VAC class	355 A	8	Large industrial equipment

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58. Overall Product Description

The Allen-Bradley 20G1ALF370AN0NNNNN is a high-power 690 VAC PowerFlex 755 variable-frequency drive designed for large three-phase AC motors.

Its 370 A current rating provides substantial motor-control capacity, while the 400 kW light-duty, 355 kW normal-duty, and 300 kW heavy-duty ratings allow it to cover a broad range of industrial applications.

The Frame 8 air-cooled construction is intended for large industrial electrical installations.

The embedded EtherNet/IP interface allows the drive to be incorporated into a networked automation system for motor control, monitoring, diagnostics, and process coordination.

The AC input with precharge, filtered configuration, IP20 / NEMA Type 1 MCC-style construction, and 800 mm-depth configuration make it appropriate for a properly engineered industrial MCC or electrical-room installation.

The drive is especially suitable for large pumps, fans, blowers, conveyors, compressors, mixers, agitators, material-handling systems, and process machinery.

Its main practical advantages are high current capacity, 690 VAC compatibility, adjustable motor speed, controlled acceleration and deceleration, network integration, process-control capability, and detailed operating information.

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59. Final Technical Summary

The 20G1ALF370AN0NNNNN can be summarized as follows:

• Allen-Bradley brand
• PowerFlex 755 series
• 690 VAC three-phase input
• 370 A output current
• 400 kW light-duty rating
• 355 kW normal-duty rating
• 300 kW heavy-duty rating
• Frame 8
• Air-cooled construction
• Embedded EtherNet/IP
• AC input with precharge
• No external DC terminals
• Type 1 / IP20 MCC-style construction
• 800 mm MCC depth
• Filtered configuration
• CM jumper removed
• No dynamic braking transistor
• Blank / no HIM configuration
• Approximately 2450 mm height
• Approximately 600 mm width
• Approximately 800 mm depth
• Approximately 620–625 kg weight class

The 20G1ALF370AN0NNNNN is therefore a high-power industrial drive intended for large motor systems where reliable variable-speed operation, high current capacity, process flexibility, and industrial network integration are required.

For final equipment selection, the motor nameplate current, duty cycle, overload requirement, voltage, speed range, braking requirements, environmental conditions, cable length, installation dimensions, cooling requirements, and complete ordered configuration should all be checked together.