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1. Product Overview

The Allen-Bradley 20G1AJF370AN0NNNNN belongs to the PowerFlex 755 series and is designed for large industrial variable-speed motor applications.

With a 690 VAC three-phase input and 370 A current class, this drive is intended for large motors where compact low-power VFDs are not appropriate.

Its principal power ratings are approximately 400 kW Light-Duty, 355 kW Normal-Duty and 300 kW Heavy-Duty.

The drive is air cooled and uses a large Frame 8 construction.

The enclosed configuration provides an IP54 / NEMA Type 12 level of protection and uses an approximately 800 mm deep MCC-style cabinet.

The product is particularly suitable for centralized electrical rooms, motor-control centers and large industrial machinery.

Typical applications include large pumps, fans, blowers, conveyors, compressors, mixers, material-handling systems, process equipment and other high-power rotating machinery.

The AN0 configuration is particularly useful where local keypad operation is not required.

The drive can instead be integrated into a PLC-based control architecture through its embedded EtherNet/IP interface.

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2. Product Identification

Parameter	Specification
Brand	Allen-Bradley
Product Family	PowerFlex
Product Series	PowerFlex 755
Product Type	High-Power Air-Cooled AC Drive
Catalog Number	20G1AJF370AN0NNNNN
Input Voltage	690 VAC
Input Phase	Three Phase
Rated Current	370 A
Light-Duty Rating	400 kW
Normal-Duty Rating	355 kW
Heavy-Duty Rating	300 kW
Frame Size	Frame 8
Cooling Method	Forced Air
Input Type	AC Input with Precharge
DC Terminals	None
Communication	Embedded EtherNet/IP
Input Filtering	Filtered
Common-Mode Jumper	Removed
Dynamic Braking	None
Enclosure	IP54 / NEMA Type 12
Cabinet Style	800 mm Deep MCC Style
Local HIM	Blank / No HIM
Mounting	Floor-Mounted
Primary Function	Large Industrial Motor Speed Control

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3. Brand and Product Series

The brand is Allen-Bradley.

The product belongs to the PowerFlex 755 series.

The PowerFlex 755 family is positioned for applications where large motor power, advanced motor control, industrial communications and flexible system integration are required.

Compared with compact PowerFlex models, the PowerFlex 755 platform is designed for substantially larger motors and more demanding industrial machinery.

The 20G1AJF370AN0NNNNN represents one of the higher-power configurations in the 690 VAC portion of the PowerFlex 755 family.

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4. Main Electrical Specifications

Electrical Parameter	Specification
Catalog Number	20G1AJF370AN0NNNNN
Input Voltage	690 VAC
Input Phase	3 Phase
Rated Output Current	370 A
Light-Duty Continuous Current	Approximately 410 A
Light-Duty 1-Minute Current	Approximately 451 A
Light-Duty Power	400 kW
Normal-Duty Continuous Current	370 A
Normal-Duty 1-Minute Current	Approximately 407 A
Normal-Duty 3-Second Current	Approximately 555 A
Normal-Duty Power	355 kW
Heavy-Duty Continuous Current	Approximately 308 A
Heavy-Duty 1-Minute Current	Approximately 339 A
Heavy-Duty 3-Second Current	Approximately 462 A
Heavy-Duty Power	300 kW
Input Type	AC with Precharge
DC Terminals	None
Cooling	Forced Air
Frame	8
Filtering	Filtered
CM Jumper	Removed
Dynamic Braking	None
Communication	Embedded EtherNet/IP

The 370 A rating makes this a substantial industrial drive.

For variable-torque applications, the Light-Duty capacity is approximately 400 kW.

For Normal-Duty applications, the rating is approximately 355 kW.

For Heavy-Duty applications, the rating is approximately 300 kW.

The correct rating should be selected according to the actual motor current, load profile and overload requirements.

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5. Duty Rating

One of the important features of the PowerFlex 755 platform is the ability to apply different duty ratings according to the characteristics of the load.

Light-Duty — 400 kW

The Light-Duty rating is approximately 400 kW.

This is particularly appropriate for variable-torque loads where the motor does not continuously operate under severe overload conditions.

Typical applications include:

• Large centrifugal pumps.
• Large centrifugal fans.
• Cooling fans.
• Large blowers.
• Ventilation equipment.
• Utility pumping systems.

Normal-Duty — 355 kW

The Normal-Duty rating is approximately 355 kW.

This rating is appropriate for general industrial motor applications with substantial continuous loading.

Typical examples include:

• Large process pumps.
• Conveyors.
• Process machinery.
• Material-handling systems.
• General industrial rotating equipment.

Heavy-Duty — 300 kW

The Heavy-Duty rating is approximately 300 kW.

This rating is intended for applications where greater torque demand and more demanding overload conditions are expected.

Typical applications include:

• Heavy conveyors.
• Mixers.
• Feeders.
• Crushers.
• Material-handling systems.
• High-inertia machinery.

The Heavy-Duty rating should be used when the load profile actually requires the additional overload capability.

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6. Overload Capability

The drive’s overload capability is an important consideration when selecting it for large machinery.

Duty	Continuous Current	1-Minute Current	3-Second Current	Power
Light Duty	Approx. 410 A	Approx. 451 A	—	400 kW
Normal Duty	370 A	Approx. 407 A	Approx. 555 A	355 kW
Heavy Duty	Approx. 308 A	Approx. 339 A	Approx. 462 A	300 kW

Short-duration overload capability can be useful during acceleration, temporary process loading and other short-term increases in mechanical torque demand.

For large machinery, this capability should be considered together with the motor’s actual torque-speed characteristics.

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7. Mechanical Specifications

Mechanical Parameter	Specification
Catalog Number	20G1AJF370AN0NNNNN
Frame Size	8
Enclosure	IP54 / NEMA Type 12
Cabinet Style	MCC Style
Nominal Cabinet Depth	800 mm
Approximate Height	2477 mm
Approximate Width	600 mm
Approximate Depth	800 mm
Approximate Filtered Depth	Up to approximately 898 mm
Approximate Base Drive Weight	Approximately 644 kg
Cooling	Forced Air
Mounting	Floor-Mounted
Local HIM	Blank / No HIM
Installation Type	Industrial Electrical Room / MCC Area
Service Access	Front Access

The Frame 8 enclosure is physically large.

A practical reference envelope for this class of PowerFlex 755 cabinet is approximately:

2477 mm × 600 mm × 800 mm (H × W × D).

The approximate base-drive weight is 644 kg.

If additional cabinets or option bays are included, the overall footprint and installed weight can increase.

The filtered arrangement may increase the effective depth to approximately 898 mm.

The exact mechanical drawing should be used for final installation, lifting, shipping and foundation calculations.

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8. Physical Construction

The 20G1AJF370AN0NNNNN is not a compact machine-mounted VFD.

It is a large floor-mounted industrial drive.

The Frame 8 construction provides sufficient space for:

• High-power switching components.
• Cooling equipment.
• Input filtering.
• Control electronics.
• Power connections.
• Communication components.
• Protection equipment.
• Internal wiring.
• Service access.

This construction is appropriate for centralized electrical installations where large motor drives are grouped together.

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9. 690 VAC Electrical Platform

The 690 VAC rating is one of the defining characteristics of this model.

Large industrial motors often use higher voltage levels as motor power increases.

At a given mechanical power level, higher voltage allows the operating current to remain lower than would be required at a much lower motor voltage.

This can be useful for:

• Cable selection.
• Switchgear sizing.
• Transformer design.
• Motor terminal arrangements.
• Large industrial power distribution.

The 690 VAC system should be designed as a complete electrical system, including transformer, protection, motor, cabling, grounding and drive.

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10. Embedded EtherNet/IP

The drive includes embedded EtherNet/IP.

This allows the VFD to be integrated into a networked industrial automation system.

Typical drive information can include:

• Run command.
• Stop command.
• Speed reference.
• Speed feedback.
• Output current.
• Drive status.
• Warning status.
• Fault status.
• Diagnostic information.
• Process-related data.

This is particularly valuable in large plants where multiple drives must be monitored and controlled from a central PLC or HMI.

The drive can therefore function as a networked component rather than as an isolated motor controller.

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11. AN0 Configuration

The AN0 configuration is supplied with a blank / no HIM arrangement.

This means there is no local full-numeric operator interface included as part of this configuration.

This is often appropriate for a large automated installation where the primary control interface is provided by:

• PLC.
• HMI.
• SCADA system.
• EtherNet/IP network.
• Centralized maintenance system.

The no-HIM arrangement can also reduce unnecessary local operator hardware when the drive is installed in a controlled electrical room.

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12. AN0 vs. JN0 and JN4

The 20G1AJF370AN0NNNNN belongs to a group of closely related 370 A configurations.

Configuration	Catalog Number	Local HIM	Typical Control Approach
AN0	20G1AJF370AN0NNNNN	Blank / No HIM	Network-centric
JN0	20G1AJF370JN0NNNNN	Blank / No HIM	Network-centric
JN4	20G1AJF370JN4NNNNN	Enhanced LCD / Full Numeric	Local + Network

The AN0 and JN0 versions are particularly similar from the standpoint of no-HIM operation.

The JN4 version is more suitable when local operator and maintenance access is important.

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13. Input Type

The drive uses AC input with precharge.

The internal precharge system controls the initial charging of the DC-link capacitors when the drive is energized.

This is especially important for a high-power drive because the DC-link capacitance is substantial.

The catalog configuration also specifies no DC terminals.

Therefore, the drive is designed around conventional AC input rather than a common DC-bus configuration.

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14. Filtering

The 20G1AJF370AN0NNNNN is supplied in a filtered configuration.

Input filtering is useful for managing electrical noise and improving compatibility with the surrounding industrial electrical system.

This can be important in plants containing:

• PLC systems.
• Industrial Ethernet networks.
• Instrumentation.
• Process-control systems.
• Measurement equipment.
• Multiple variable-frequency drives.

Filtering should still be considered together with proper grounding, cable shielding and installation practices.

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15. Common-Mode Jumper Removed

One of the configuration details that distinguishes this model is the CM jumper removed configuration.

This affects the drive’s common-mode electrical relationship with ground.

It should be considered together with:

• Motor insulation.
• Cable construction.
• Motor-cable length.
• Grounding architecture.
• EMC requirements.
• Bearing-current considerations.
• Power-distribution configuration.

The CM jumper configuration should not be changed casually after installation.

It should be selected according to the electrical system and the manufacturer’s installation requirements.

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16. Dynamic Braking

The 20G1AJF370AN0NNNNN is configured with no dynamic-braking transistor.

This is important for applications with significant regenerative energy.

Potentially demanding applications include:

• High-inertia machinery.
• Rapid stopping.
• Overhauling loads.
• Vertical machinery.
• Large flywheels.
• Rapid-cycle machinery.

If the process requires fast deceleration or significant regenerative energy absorption, the complete braking system should be evaluated before selecting the final drive configuration.

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17. Enclosure Protection

The drive uses IP54 / NEMA Type 12 enclosure protection.

This is suitable for many industrial electrical rooms and enclosed MCC environments.

The enclosure can help protect the internal drive components from:

• Dust.
• Dirt.
• Incidental liquid exposure.
• Normal industrial contamination.

Typical installation locations include:

• Manufacturing plants.
• Process plants.
• Electrical rooms.
• MCC rooms.
• Utility buildings.
• Water-treatment facilities.
• Mining electrical rooms.

Severe corrosive or conductive environments require additional engineering evaluation.

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18. Forced-Air Cooling

The 370 A power level results in substantial heat generation.

The drive therefore uses forced-air cooling.

Cooling performance depends on:

• Fan operation.
• Airflow.
• Ambient temperature.
• Room ventilation.
• Dust accumulation.
• Installation altitude.
• Cabinet condition.
• HVAC capacity.

Large rooms containing several PowerFlex 755 drives may require substantial HVAC capacity.

Cooling-fan inspection should be included in preventive maintenance.

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19. Application: Large Pumps

Large pumps are among the most suitable applications for this drive.

Variable-speed operation can allow pump speed to be adjusted according to process demand.

Potential applications include:

• Industrial water pumps.
• Cooling-water pumps.
• Process pumps.
• Water-treatment pumps.
• Wastewater pumps.
• Circulation pumps.
• Utility pumping systems.

The 400 kW Light-Duty rating is particularly relevant to suitable variable-torque pump applications.

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20. Application: Large Fans

Large fans can benefit from variable-speed control.

Potential applications include:

• Industrial ventilation.
• Furnace fans.
• Exhaust systems.
• Cooling systems.
• Combustion-air systems.
• Dust collection.
• Process ventilation.

For these applications, the Light-Duty rating can provide substantial available motor power.

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21. Application: Large Blowers

Industrial blowers can require high motor power while operating over a variable airflow range.

The drive can regulate motor speed according to process demand.

Potential applications include:

• Process air.
• Industrial exhaust.
• Dust collection.
• Pneumatic conveying.
• Combustion systems.
• Large ventilation systems.

The actual duty rating should be selected according to the blower’s torque-speed characteristics.

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22. Application: Conveyors

The drive is also suitable for large conveyor systems.

Conveyor motors can require considerable torque during startup.

Controlled acceleration can help reduce mechanical shock.

Potential benefits include reduced stress on:

• Conveyor belts.
• Gearboxes.
• Couplings.
• Shafts.
• Rollers.
• Mechanical structures.

Applications include mining, aggregate, cement, bulk-material handling and industrial production.

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23. Application: Mining Equipment

The 690 VAC high-power platform makes this drive appropriate for many large mining applications.

Potential equipment includes:

• Ore conveyors.
• Transfer conveyors.
• Feeders.
• Pumps.
• Fans.
• Material-handling machinery.
• Processing equipment.

Mining environments require particular attention to dust, vibration, temperature and maintenance access.

The IP54 / NEMA Type 12 enclosure is useful for an appropriately designed electrical-room installation.

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24. Application: Bulk Material Handling

Large material-handling equipment often requires high-power motors.

Potential applications include:

• Aggregate handling.
• Cement plants.
• Ports.
• Storage facilities.
• Bulk conveyors.
• Transfer systems.
• Feed systems.

The variable-speed capability can provide controlled acceleration and process-speed regulation.

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25. Application: Compressors

Large industrial compressors can use motors in the hundreds-of-kilowatts range.

The 20G1AJF370AN0NNNNN provides a high-power platform for compressor systems where variable-speed control is appropriate.

Potential applications include:

• Industrial air compressors.
• Process compressors.
• Utility compressors.
• Refrigeration equipment.
• Process-gas systems.

The compressor manufacturer’s speed and torque requirements should always be considered.

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26. Application: Mixers

Large mixers can require significant torque.

The PowerFlex 755 can provide controlled acceleration and variable-speed operation.

Potential applications include:

• Chemical processing.
• Cement.
• Mineral processing.
• Slurry processing.
• Industrial batch production.
• Large material mixing.

For demanding constant-torque applications, the Heavy-Duty rating should be used when selecting the drive.

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27. Application: Process Machinery

The drive can be used for large process machines requiring variable-speed control.

Potential applications include:

• Large rollers.
• Production lines.
• Process machinery.
• Material-processing systems.
• Large rotating equipment.
• Industrial production machines.

EtherNet/IP allows the drive to exchange control and status information with the rest of the automation system.

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28. Application: Water and Utility Systems

The drive is also suitable for large utility systems.

Examples include:

• Large water pumps.
• Cooling-water systems.
• Utility blowers.
• Industrial wastewater systems.
• Ventilation systems.
• Process-water equipment.

The enclosed cabinet is particularly appropriate when the drive is installed inside a dedicated electrical room.

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29. Main Product Advantages

29.1 High-Power 690 VAC Operation

The 690 VAC platform allows the drive to serve large motor systems while maintaining a practical current level for the power rating.

29.2 370 A Current Capacity

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

29.3 400 kW Light-Duty Rating

This provides significant capacity for variable-torque applications.

29.4 355 kW Normal-Duty Rating

The Normal-Duty rating provides a strong fit for general large industrial machinery.

29.5 300 kW Heavy-Duty Rating

This provides substantial capacity for more demanding constant-torque applications.

29.6 Embedded EtherNet/IP

Integrated communication simplifies integration into PLC-based industrial automation.

29.7 IP54 / NEMA Type 12 Enclosure

The enclosed design provides useful industrial environmental protection.

29.8 Frame 8 Construction

The Frame 8 architecture is designed for large industrial power levels.

29.9 No-HIM Configuration

The AN0 configuration is well suited to centralized network-controlled installations.

29.10 Filtered Input

The filtered configuration helps address electrical-noise requirements within the complete installation.

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30. Product Advantages in Centralized Control

The AN0 configuration is particularly attractive when the drive is installed in a centralized electrical room.

A typical system can use:

PLC → EtherNet/IP → PowerFlex 755 → 690 VAC Motor

The operator may interact with the motor through a central HMI rather than through a local drive keypad.

This architecture is especially useful when a facility contains many large motors.

The central control system can provide:

• Start/stop control.
• Speed control.
• Status monitoring.
• Fault monitoring.
• Alarm management.
• Maintenance information.
• Production coordination.

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31. Maintenance Advantages

The networked architecture provides useful remote information.

Maintenance personnel can monitor:

• Drive status.
• Current.
• Speed.
• Fault conditions.
• Warnings.
• Communication status.
• Operating conditions.

This can reduce the need for technicians to physically access the drive for every routine status check.

For local maintenance access, a related JN4 configuration can be considered.

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32. Five Related Models from the Same Series

The following models are closely related PowerFlex 755 configurations within the 690 VAC high-power family.

Model	Voltage	Current	Light Duty	Normal Duty	Heavy Duty	Frame	Enclosure
20G1AJF265AN0NNNNN	690 VAC	265 A	315 kW	250 kW	200 kW	8	IP54 / Type 12
20G1AJF330AN0NNNNN	690 VAC	330 A	355 kW	315 kW	250 kW	8	IP54 / Type 12
20G1AJF370AN0NNNNN	690 VAC	370 A	400 kW	355 kW	300 kW	8	IP54 / Type 12
20G1AJF415AN0NNNNN	690 VAC	415 A	450 kW	400 kW	355 kW	8	IP54 / Type 12
20G1AJF460AN0NNNNN	690 VAC	460 A	500 kW	450 kW	375 kW	8	IP54 / Type 12

These models form a useful capacity progression.

The 265 A version is the lower-capacity alternative.

The 330 A version is one step below the target model.

The 415 A and 460 A versions provide progressively more current and power capacity.

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33. Related Model Current Comparison

Model	Continuous Current	Light Duty	Normal Duty	Heavy Duty
20G1AJF265AN0NNNNN	265 A	315 kW	250 kW	200 kW
20G1AJF330AN0NNNNN	330 A	355 kW	315 kW	250 kW
20G1AJF370AN0NNNNN	370 A	400 kW	355 kW	300 kW
20G1AJF415AN0NNNNN	415 A	450 kW	400 kW	355 kW
20G1AJF460AN0NNNNN	460 A	500 kW	450 kW	375 kW

The 370 A model is positioned between the 330 A and 415 A versions.

This makes it a useful selection when a 330 A drive does not provide enough current but a 415 A drive would be unnecessarily large.

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34. Related Models with JN4 Local HIM

If local operator access is required, JN4 versions provide a useful alternative.

Model	Voltage	Current	Light Duty	Normal Duty	Heavy Duty	Local HIM
20G1AJF265JN4NNNNN	690 VAC	265 A	315 kW	250 kW	200 kW	Enhanced LCD / Full Numeric
20G1AJF330JN4NNNNN	690 VAC	330 A	355 kW	315 kW	250 kW	Enhanced LCD / Full Numeric
20G1AJF370JN4NNNNN	690 VAC	370 A	400 kW	355 kW	300 kW	Enhanced LCD / Full Numeric
20G1AJF415JN4NNNNN	690 VAC	415 A	450 kW	400 kW	355 kW	Enhanced LCD / Full Numeric
20G1AJF460JN4NNNNN	690 VAC	460 A	500 kW	450 kW	375 kW	Enhanced LCD / Full Numeric

The JN4 configuration is useful when local commissioning and maintenance are important.

The AN0 configuration is more appropriate when the installation is designed around centralized control and does not require a local HIM.

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35. Mechanical Comparison of Related Models

Model	Approx. Height	Approx. Width	Approx. Depth	Approx. Weight	Frame
20G1AJF265AN0NNNNN	2477 mm class	600 mm class	800 mm class	644 kg class	8
20G1AJF330AN0NNNNN	2477 mm class	600 mm class	800 mm class	644 kg class	8
20G1AJF370AN0NNNNN	2477 mm class	600 mm class	800 mm class	644 kg class	8
20G1AJF415AN0NNNNN	2477 mm class	600 mm class	800 mm class	644 kg class	8
20G1AJF460AN0NNNNN	2477 mm class	600 mm class	800 mm class	644 kg class	8

These figures represent the common Frame 8 cabinet class.

The actual final equipment dimensions and weight can change with options and cabinet arrangements.

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36. Five Other Popular Allen-Bradley Models

Model	Series	Voltage	Current	Power Rating	Frame	Enclosure / Construction	Typical Application
25B-D030N114	PowerFlex 525	380–480 VAC	30 A	20 HP ND / 15 HP HD	D	IP20	Compact machine control
25C-D030N114	PowerFlex 527	380–480 VAC	30 A	20 HP ND / 15 HP HD	D	IP20	Networked machine control
20F1AND302JA0NNNNN	PowerFlex 753	480 VAC	302 A	250 HP ND / 200 HP HD	7	Industrial drive	Large industrial motors
20G1AJE460JN4NNNNN	PowerFlex 755	600 VAC	460 A	500 HP class	8	IP54 / Type 12	Large 600 VAC motors
20G1AJF415JN4NNNNN	PowerFlex 755	690 VAC	415 A	450 kW LD / 400 kW ND / 355 kW HD	8	IP54 / Type 12	High-power 690 VAC motors

These five models cover different sections of the Allen-Bradley drive portfolio.

The 25B-D030N114 is aimed at compact machine applications.

The 25C-D030N114 is another compact solution with strong network-oriented machine-control capabilities.

The 20F1AND302JA0NNNNN provides a comparison with the PowerFlex 753 platform at 480 VAC.

The 20G1AJE460JN4NNNNN is useful for large 600 VAC motor systems.

The 20G1AJF415JN4NNNNN is one of the closest alternatives when the motor is in the 690 VAC high-power range but requires more than approximately 370 A.

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37. Popular Model Application Comparison

Model	Primary Application	Main Advantage	Relative Size
25B-D030N114	Compact machinery	Compact drive and integrated communications	Small
25C-D030N114	Automated machinery	Network-centric machine control	Small
20F1AND302JA0NNNNN	Large industrial equipment	High-power 480 VAC operation	Large
20G1AJE460JN4NNNNN	Large 600 VAC motors	High-current PowerFlex 755	Very Large
20G1AJF415JN4NNNNN	Large 690 VAC motors	Higher current than 370 A class	Very Large

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38. Comparison: 20G1AJF370AN0NNNNN vs. 20G1AJF330AN0NNNNN

Parameter	20G1AJF370AN0NNNNN	20G1AJF330AN0NNNNN
Voltage	690 VAC	690 VAC
Current	370 A	330 A
Light Duty	400 kW	355 kW
Normal Duty	355 kW	315 kW
Heavy Duty	300 kW	250 kW
Frame	8	8
Enclosure	IP54 / Type 12	IP54 / Type 12
Cooling	Forced Air	Forced Air
EtherNet/IP	Yes	Yes
Local HIM	No	No
Main Difference	Higher capacity	Lower capacity

The 370 A version provides a useful additional operating margin compared with the 330 A model.

It is particularly useful when the motor current is approaching the upper range of the 330 A configuration.

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39. Comparison: 20G1AJF370AN0NNNNN vs. 20G1AJF415AN0NNNNN

Parameter	20G1AJF370AN0NNNNN	20G1AJF415AN0NNNNN
Voltage	690 VAC	690 VAC
Current	370 A	415 A
Light Duty	400 kW	450 kW
Normal Duty	355 kW	400 kW
Heavy Duty	300 kW	355 kW
Frame	8	8
Enclosure	IP54 / Type 12	IP54 / Type 12
Cooling	Forced Air	Forced Air
EtherNet/IP	Yes	Yes
Local HIM	No	No
Main Difference	Lower capacity	Higher capacity

The 415 A version is a logical alternative when the motor requires more than the 370 A class can comfortably provide.

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40. Comparison: AN0 and JN4

Feature	20G1AJF370AN0NNNNN	20G1AJF370JN4NNNNN
Voltage	690 VAC	690 VAC
Current	370 A	370 A
Light Duty	400 kW	400 kW
Normal Duty	355 kW	355 kW
Heavy Duty	300 kW	300 kW
Frame	8	8
Enclosure	IP54 / Type 12	IP54 / Type 12
Cooling	Forced Air	Forced Air
EtherNet/IP	Yes	Yes
Input	AC with Precharge	AC with Precharge
DC Terminals	None	None
Dynamic Braking	None	None
Local HIM	Blank / No HIM	Enhanced LCD / Full Numeric
Primary Advantage	Centralized/network control	Local + network control

If the installation is controlled entirely through a PLC and HMI, the AN0 version can be a practical configuration.

If local operator access is important, the JN4 version is generally the more convenient choice.

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41. Motor Selection

The motor should be selected based on its actual nameplate data.

Important values include:

• Rated voltage.
• Rated current.
• Rated power.
• Rated speed.
• Service factor.
• Starting torque.
• Continuous torque.
• Overload requirements.
• Minimum speed.
• Maximum speed.

The motor current is especially important.

A motor’s kW rating alone does not always provide enough information to select a large industrial VFD.

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42. Power Distribution Requirements

A 690 VAC, 370 A drive requires a properly engineered electrical distribution system.

The installation should consider:

• Transformer capacity.
• Short-circuit current.
• Input protection.
• Disconnect equipment.
• Cable ampacity.
• Grounding.
• Motor cable construction.
• EMC.
• Harmonics.
• Motor insulation.
• Safety circuits.

The drive should therefore be selected as part of the complete motor-control system.

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43. Thermal Management

Thermal management is particularly important at this power level.

The drive can generate considerable heat during operation.

The electrical room should have enough capacity to remove the heat produced by the drive.

Important factors include:

• Number of drives.
• Ambient temperature.
• Drive loading.
• Room ventilation.
• HVAC capacity.
• Airflow.
• Dust accumulation.
• Fan condition.

If several large drives are installed in the same room, the combined thermal load can be substantial.

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44. Preventive Maintenance

A suitable preventive-maintenance program should include regular checks of:

Maintenance Item	Main Inspection
Cooling Fans	Operation, noise and airflow
Air Passages	Dust and obstruction
Cabinet	Cleanliness
Power Terminals	Connection condition
Grounding	Ground integrity
Motor Cables	Insulation and termination
Network	EtherNet/IP communication
Fault History	Repeated faults
Motor Current	Abnormal changes
Cabinet Temperature	Overheating
Enclosure	Physical condition and seals
Internal Components	Thermal or mechanical damage

The maintenance interval should be adapted to the actual application.

Mining, cement, aggregate and dusty industrial facilities generally require more frequent inspection than clean electrical rooms.

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45. Installation Considerations

The large Frame 8 cabinet requires careful planning.

A preliminary installation envelope of approximately:

2477 mm H × 600 mm W × 800 mm D

should be considered.

The approximate base-drive weight is:

644 kg

The installation area should provide enough space for:

• Transportation.
• Lifting.
• Cable routing.
• Door operation.
• Maintenance.
• Cooling.
• Electrical access.
• Future replacement.

The floor must be capable of supporting the equipment.

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46. Suitable Industries

The drive can be considered for:

Mining

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

Cement

Fans, conveyors, mixers and process equipment.

Water and Wastewater

Large pumps, blowers and circulation systems.

Chemical Processing

Pumps, mixers, compressors and process equipment.

Metals

Large fans, pumps, rollers and production machinery.

Manufacturing

Large production lines and rotating machinery.

Utilities

Large pumps, fans and auxiliary equipment.

Bulk Material Handling

Conveyors, feeders and transfer systems.

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47. Overall Product Advantages

The 20G1AJF370AN0NNNNN combines a high-voltage motor-control architecture with substantial output capacity.

Its major advantages include:

• 690 VAC operation.
• 370 A current class.
• 400 kW Light-Duty rating.
• 355 kW Normal-Duty rating.
• 300 kW Heavy-Duty rating.
• Frame 8 construction.
• IP54 / NEMA Type 12 enclosure.
• Forced-air cooling.
• Embedded EtherNet/IP.
• Filtered input.
• Removed common-mode jumper.
• AC input with precharge.
• No DC terminals.
• No dynamic-braking transistor.
• No local HIM.

This makes it especially attractive for large networked motor-control systems.

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48. Final Technical Specification Table

Parameter	Specification
Brand	Allen-Bradley
Series	PowerFlex 755
Model	20G1AJF370AN0NNNNN
Product Type	High-Power Air-Cooled AC Drive
Input Voltage	690 VAC
Input Phase	Three Phase
Rated Current	370 A
Light-Duty Rating	400 kW
Normal-Duty Rating	355 kW
Heavy-Duty Rating	300 kW
Light-Duty Current	Approx. 410 A continuous
Light-Duty 1-Minute Current	Approx. 451 A
Normal-Duty Current	370 A continuous
Normal-Duty 1-Minute Current	Approx. 407 A
Normal-Duty 3-Second Current	Approx. 555 A
Heavy-Duty Current	Approx. 308 A continuous
Heavy-Duty 1-Minute Current	Approx. 339 A
Heavy-Duty 3-Second Current	Approx. 462 A
Frame	8
Cooling	Forced Air
Enclosure	IP54 / NEMA Type 12
Cabinet Depth	800 mm
Approx. Height	2477 mm
Approx. Width	600 mm
Approx. Depth	800 mm
Approx. Filtered Depth	898 mm
Approx. Base Weight	644 kg
Input Configuration	AC Input with Precharge
DC Terminals	None
Communication	Embedded EtherNet/IP
Filtering	Filtered
CM Jumper	Removed
Dynamic Braking	None
Local HIM	Blank / No HIM
Mounting	Floor-Mounted
Primary Applications	Pumps, fans, blowers, conveyors, compressors, mixers, process machinery
Typical Installation	Industrial Electrical Room / MCC

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49. Final Recommendation

The Allen-Bradley 20G1AJF370AN0NNNNN is a strong choice for large industrial motor applications where the system requires a 690 VAC, 370 A PowerFlex 755 platform.

Its 400 kW Light-Duty rating makes it especially suitable for large variable-torque applications such as centrifugal pumps and fans.

The 355 kW Normal-Duty rating provides a strong capacity level for general industrial motor systems.

The 300 kW Heavy-Duty rating makes it suitable for demanding constant-torque applications when the motor and load fall within the applicable rating.

The IP54 / NEMA Type 12 Frame 8 enclosure is appropriate for many industrial electrical-room installations.

The embedded EtherNet/IP interface makes the drive particularly suitable for centralized PLC-based automation.

The AN0 no-HIM configuration is a practical choice when operators and maintenance personnel primarily work through a centralized HMI, PLC or industrial network.

If local operator access is required, the related 20G1AJF370JN4NNNNN configuration is a logical alternative.

If the motor requires less capacity, the 20G1AJF330AN0NNNNN can be considered.

If the motor requires more current, the 20G1AJF415AN0NNNNN or 20G1AJF460AN0NNNNN can provide additional capacity.

One lifecycle point is important for procurement: the exact 20G1AJF370AN0NNNNN catalog number is a discontinued configuration, with the 20G1AJF370JN0NNNNN identified as its direct replacement. Therefore, for a new project, the replacement catalog number should be evaluated rather than treating the AN0 version as a current new-product selection.