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Allen-Bradley 20G1ALC750JN2NNNNN PowerFlex 755 AC Drive

1. Product Overview

The Allen-Bradley 20G1ALC750JN2NNNNN is a high-power AC variable frequency drive from the PowerFlex 755 series, designed for large industrial motors and demanding variable-speed applications.

This model is built around a 400 VAC, three-phase power system and provides a substantial 750 A current rating. Its power capability is approximately 450 kW for Light Duty, 400 kW for Normal Duty, and 315 kW for Heavy Duty.

The unit uses an air-cooled Frame 8 construction and is configured as an 800 mm deep MCC-style drive with Type 1 / IP20 protection characteristics.

A major feature of this particular catalog configuration is its integrated EtherNet/IP communication capability, combined with a door-mounted HIM with IP20/NEMA 1 characteristics. This distinguishes the JN2 configuration from the JN0 configuration, which does not include the same door-mounted HIM arrangement.

The JN2 version is therefore particularly useful when a project requires both centralized network control and a physical operator interface mounted on the drive enclosure.

The drive is intended for applications such as large pumps, fans, blowers, conveyors, process machinery, water-treatment systems, material-handling equipment, mining equipment, chemical-processing machinery, pulp and paper equipment, and other large industrial motor systems.

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2. Brand and Product Series

Item	Description
Brand	Allen-Bradley
Product Series	PowerFlex 755
Product Type	High-Power AC Variable Frequency Drive
Complete Model	20G1ALC750JN2NNNNN
Drive Family	PowerFlex 755 AC Drives
Cooling	Air cooled
Frame	Frame 8
Input Voltage	400 VAC
Input Phase	3 Phase
Rated Current	750 A
Light-Duty Rating	450 kW
Normal-Duty Rating	400 kW
Heavy-Duty Rating	315 kW
Communication	Embedded EtherNet/IP
Enclosure	Type 1 / IP20
Installation Style	800 mm deep MCC style
Input Configuration	AC input with precharge
DC Terminals	None
EMC Configuration	Filtered
CM Jumper	Installed
Operator Interface	Door-mounted HIM
HIM Protection	IP20 / NEMA 1
Dynamic Braking	No integrated braking transistor
Main Application	Large industrial motor control

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3. Main Technical Parameters

Parameter	Specification
Model	20G1ALC750JN2NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Drive Type	AC Variable Frequency Drive
Input Voltage	400 VAC
Input Phase	3 Phase
Rated Current	750 A
Light-Duty Rating	450 kW
Normal-Duty Rating	400 kW
Heavy-Duty Rating	315 kW
Frame Size	Frame 8
Cooling Method	Air cooled
Input Arrangement	AC input with precharge
DC Terminals	None
Communication	Embedded EtherNet/IP
Filter	Filtered
CM Jumper	Installed
Enclosure	Type 1 / IP20
Installation	800 mm deep MCC-style
Operator Interface	Door-mounted HIM
HIM Rating	IP20 / NEMA 1
Dynamic Braking	No integrated braking transistor
Approx. Dimensions	2450 × 600 × 800 mm
Approx. Weight	620–630 kg
Mounting	MCC / industrial cabinet installation
Intended Environment	Controlled industrial electrical environment

The dimensions and weight shown above are approximate engineering planning values for this large Frame 8 configuration. Actual shipping dimensions, enclosure dimensions, mounting dimensions, and final mass can vary with the exact configured package and accessories.

For final cabinet construction, lifting calculations, transportation, foundation design, and installation clearances, the approved mechanical documentation for the exact unit should take precedence.

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4. Electrical Characteristics

The 20G1ALC750JN2NNNNN is designed around a 400 VAC three-phase input.

Its 750 A current rating makes it a high-capacity industrial drive intended for large motors and substantial mechanical loads.

The three-phase AC input is processed through the drive’s power-conversion system, after which the inverter section generates a controlled variable-frequency output for the motor.

By changing the output frequency and voltage according to the control requirements, the drive can regulate motor speed and torque.

This provides a practical alternative to operating a motor continuously at full speed and controlling the process through mechanical restrictions.

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5. Duty Ratings

The drive has different power ratings according to operating duty.

Duty Classification	Power Rating	Typical Load Characteristics
Light Duty	450 kW	Variable or relatively smooth load
Normal Duty	400 kW	General continuous industrial load
Heavy Duty	315 kW	Higher torque and overload requirements

Understanding these three ratings is important when selecting the drive.

A motor’s nameplate kW is not sufficient by itself to determine whether the drive is correctly sized.

The engineer should also consider motor full-load current, starting torque, acceleration time, overload duration, mechanical inertia, operating cycle, and the severity of the application.

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6. Light-Duty Operation — 450 kW

The 450 kW Light-Duty rating makes this drive suitable for large variable-load applications.

Typical examples include large centrifugal pumps, fans, and blowers where the torque requirement changes relatively smoothly with speed.

These applications often benefit from variable-speed operation because the motor does not necessarily need to operate at maximum speed throughout the entire process.

The drive can adjust motor speed according to the required process condition.

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7. Normal-Duty Operation — 400 kW

The 400 kW Normal-Duty rating is a useful reference for general industrial applications.

This rating can be considered for continuous motor operation where the load is substantial but does not continuously require the higher overload capability associated with a heavy-duty application.

Potential applications include:

• Large pumps.
• Large ventilation systems.
• Industrial fans.
• Process blowers.
• Continuous conveyors.
• Material-handling systems.
• Industrial process equipment.

The final selection should always be based on actual motor current and operating conditions.

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8. Heavy-Duty Operation — 315 kW

The 315 kW Heavy-Duty rating is important for applications involving higher torque demand or more demanding overload conditions.

Examples may include:

• Heavy conveyors.
• Mixers.
• Certain crushers.
• Material-handling machinery.
• Process machinery.
• High-inertia mechanical systems.
• Equipment with frequent acceleration and deceleration.

Heavy-duty selection should be based on the actual duty cycle rather than simply selecting the largest available power number.

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9. 750 A Current Rating

The 750 A current rating is one of the most significant characteristics of this model.

A drive with this current capacity is intended for large industrial motor systems.

At this power level, correct electrical engineering becomes increasingly important.

The incoming feeder, transformer, protection, cable system, grounding, motor cable length, ventilation, and cabinet layout should all be considered during system design.

The motor should also be checked against the appropriate duty rating.

A 400 kW motor, for example, should not automatically be considered compatible merely because the drive has a 400 kW Normal-Duty rating.

The motor’s actual full-load current and application requirements must be checked.

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10. AC Input With Precharge

The 20G1ALC750JN2NNNNN uses an AC input with precharge.

The precharge function is important in high-power drive systems because the drive contains an energy-storage DC-link section.

During energization, the precharge system controls the initial charging process and helps manage the electrical stress associated with charging the DC-link capacitors.

For a large 750 A drive, the incoming electrical system should be designed carefully.

The following should be evaluated:

• Incoming voltage.
• Transformer capacity.
• Feeder capacity.
• Protective devices.
• Short-circuit conditions.
• Grounding arrangement.
• Disconnecting equipment.
• Cable sizing.
• Installation environment.

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11. No DC Terminals

This configuration does not provide external DC terminals.

The drive is therefore primarily intended as a conventional AC-input variable frequency drive rather than a drive configured around a user-accessible external common DC bus.

This can be appropriate for standard industrial motor applications.

Applications involving shared DC buses, regenerative systems, or energy transfer between multiple drives require separate engineering consideration.

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12. Embedded EtherNet/IP Communication

The 20G1ALC750JN2NNNNN includes embedded EtherNet/IP communication.

This allows the drive to become part of a modern industrial automation network.

A typical control architecture can be represented as:

PLC → EtherNet/IP → PowerFlex 755 → Motor

The PLC can provide commands and references, while the drive provides operating status and diagnostic information.

Depending on the application and control configuration, networked information can include:

• Start command.
• Stop command.
• Speed reference.
• Frequency reference.
• Drive status.
• Running status.
• Fault status.
• Alarm information.
• Output current.
• Output frequency.
• Diagnostic information.

This makes the drive well suited to centralized automation systems.

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13. Door-Mounted HIM

One of the most important characteristics of the JN2 configuration is the inclusion of a door-mounted HIM.

The HIM provides a physical operator interface mounted on the drive enclosure.

This can be useful during:

• Commissioning.
• Maintenance.
• Local diagnostics.
• Parameter checking.
• Fault investigation.
• Manual operating procedures.
• Local status monitoring.

The HIM is specified with IP20 / NEMA 1 characteristics.

This gives the operator a direct interface at the enclosure without requiring every basic task to be performed through a remote PLC or engineering workstation.

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14. Difference Between JN0 and JN2 Configurations

The JN0 and JN2 configurations are closely related, but the operator-interface arrangement is different.

Feature	JN0	JN2
Model Example	20G1ALC750JN0NNNNN	20G1ALC750JN2NNNNN
Voltage	400 VAC	400 VAC
Current	750 A	750 A
LD	450 kW	450 kW
ND	400 kW	400 kW
HD	315 kW	315 kW
Cooling	Air cooled	Air cooled
Frame	Frame 8	Frame 8
EtherNet/IP	Yes	Yes
800 mm MCC Style	Yes	Yes
CM Jumper	Removed	Installed
HIM	None	Door-mounted HIM
HIM Protection	—	IP20 / NEMA 1

This distinction is useful when replacing an existing drive.

If an installation requires a local door-mounted operator interface, the JN2 configuration is much more appropriate than a no-HIM configuration.

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15. CM Jumper Installed

The JN2 configuration is specified with the CM jumper installed.

This is an important catalog configuration detail.

Common-mode behavior is related to the electrical grounding and filtering architecture of the drive.

The correct configuration should be considered together with:

• Facility grounding.
• Motor grounding.
• Cable shielding.
• EMC requirements.
• Input power arrangement.
• Motor cable construction.
• Installation environment.

For replacement work, technicians should compare the configuration of the existing unit before changing any jumper arrangement.

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16. Filtered Configuration

The drive is supplied as a filtered configuration.

Filtering can help manage conducted electrical noise generated by the high-frequency switching behavior of the drive.

However, filtering alone does not guarantee a problem-free EMC installation.

The complete system should also consider:

• Motor cable routing.
• Cable shielding.
• Grounding.
• Bonding.
• Control-cable separation.
• Communication cable routing.
• Cabinet construction.
• Motor frame grounding.

Correct installation practices are particularly important when a large drive is installed close to sensitive instrumentation or communication equipment.

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17. Type 1 / IP20 Enclosure

The drive has a Type 1 / IP20 enclosure classification.

This configuration is intended for a controlled industrial electrical environment.

Typical installation locations include:

• Electrical rooms.
• MCC rooms.
• Drive rooms.
• Industrial control cabinets.
• Protected machinery electrical areas.
• Indoor automation equipment rooms.

IP20 should not be interpreted as water-resistant or suitable for direct outdoor exposure.

If the installation environment contains water spray, washdown, heavy dust, corrosive chemicals, or other aggressive contaminants, the overall enclosure arrangement needs additional consideration.

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18. Frame 8 Construction

The 20G1ALC750JN2NNNNN uses a Frame 8 platform.

The frame size is important because it determines much of the physical arrangement, power-handling capacity, cooling arrangement, and mechanical installation requirements.

Frame 8 is substantially larger than the compact drive frames normally used for small machine motors.

This means that mechanical installation is an important part of project planning.

The project should account for:

• Cabinet dimensions.
• Access clearance.
• Lifting.
• Transportation.
• Cable entry.
• Ventilation.
• Maintenance access.
• Floor loading.

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19. Approximate Dimensions and Weight

For preliminary planning purposes, the large Frame 8 configuration can be considered using an approximate mechanical envelope of:

Mechanical Parameter	Approximate Value
Height	2450 mm
Width	600 mm
Depth	800 mm
Approximate Weight	620–630 kg
Frame	Frame 8
MCC Depth	800 mm

The 800 mm depth is consistent with the specified MCC-style configuration.

The height, width, and weight should be treated as preliminary planning values rather than final certified mechanical dimensions.

Actual dimensions can be affected by enclosure construction, packaging, options, cable-entry arrangements, door configuration, and project-specific hardware.

Before designing a foundation, lifting system, shipping route, or final cabinet arrangement, use the final mechanical drawing for the exact configured drive.

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20. Cooling System

The 20G1ALC750JN2NNNNN is air cooled.

Air cooling is a practical solution for large industrial drives because it provides a familiar maintenance structure and avoids the complexity of a liquid-cooling system.

However, high-power drives produce significant heat.

The electrical room or cabinet therefore needs an appropriate thermal-management strategy.

The installation should provide:

• Adequate airflow.
• Suitable ambient temperature.
• Proper ventilation.
• Clean cooling air.
• Sufficient service clearance.
• Appropriate exhaust arrangements.
• Regular inspection of cooling components.

Dust accumulation can restrict airflow and increase operating temperature.

For this reason, environmental cleanliness is an important part of drive maintenance.

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21. Product Introduction

The 20G1ALC750JN2NNNNN is designed for large industrial motor-control systems where both high electrical capacity and automation functionality are required.

It is not simply a speed controller installed independently from the rest of the machine.

In a typical application, it forms part of a larger control architecture.

The PLC controls the process.

The network transfers commands and operating information.

The PowerFlex 755 controls the motor.

The motor drives the mechanical equipment.

Sensors provide feedback.

The HMI gives operators access to operating information and controls.

This creates a complete automation system rather than an isolated motor-control device.

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22. Basic Operating Principle

The drive receives three-phase AC power from the industrial electrical system.

The input power is processed through the drive’s power-conversion section.

The resulting DC-link power is then converted through the inverter section into a controlled three-phase output.

The output frequency determines the motor’s operating speed, while voltage and current are controlled according to the selected motor-control strategy and operating conditions.

This provides a smooth method of changing motor speed and torque.

For example, a large pump can run at a reduced speed when the process requires less flow.

Similarly, a conveyor can accelerate gradually instead of receiving an abrupt full-speed command.

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23. Main Applications

The 20G1ALC750JN2NNNNN can be considered for a wide range of large industrial applications.

Large Pump Systems

Large water pumps, process pumps, booster pumps, intake pumps, and industrial circulation systems can use variable-speed control.

The drive can adjust motor speed according to process requirements.

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Water and Wastewater Treatment

Large water-treatment plants often contain high-power pumping equipment.

Variable-speed operation can be used to control:

• Water flow.
• System pressure.
• Tank levels.
• Process circulation.
• Booster pressure.

The drive’s network communication is also useful when multiple pumping stations are integrated into a centralized control system.

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Large Fans

Large industrial fans frequently operate under changing airflow requirements.

A variable-frequency drive allows the motor speed to follow actual process demand.

This can reduce unnecessary operation at maximum speed.

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Industrial Blowers

Large blowers used in process ventilation, combustion systems, wastewater treatment, pneumatic systems, and industrial air handling can require high motor power.

The 750 A platform provides the electrical capacity needed for large blower systems.

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Conveyors

Large conveyors can benefit from controlled acceleration and deceleration.

A gradual acceleration profile can help reduce mechanical stress on:

• Belts.
• Gearboxes.
• Couplings.
• Bearings.
• Mechanical structures.

The final drive duty selection should be based on the actual conveyor load and torque profile.

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Mining Equipment

Mining systems often contain large motors for:

• Conveyors.
• Pumps.
• Fans.
• Crushers.
• Material handling.
• Processing equipment.

The high current capability of this drive makes it relevant to large mining installations, although each application requires specific mechanical and electrical evaluation.

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Cement and Building Materials

Large fans, conveyors, crushers, mixers, and process equipment can require high-power variable-speed motor control.

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Pulp and Paper

Large industrial process machines, fans, pumps, conveyors, and auxiliary equipment can use high-power AC drives.

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Chemical Processing

Large pumps, mixers, blowers, and process equipment can benefit from variable-speed operation and centralized monitoring.

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24. Application Comparison

Application	Typical Requirement	Suitability
Large centrifugal pump	Variable flow and pressure	Very suitable
Large industrial fan	Variable airflow	Very suitable
Large blower	Adjustable process airflow	Very suitable
Conveyor	Controlled acceleration and speed	Suitable
Water-treatment pump	Pressure / flow control	Very suitable
Mining conveyor	Large motor and controlled acceleration	Suitable with engineering review
Crusher	High torque and overload	Application dependent
Mixer	High starting torque	Application dependent
Compressor	Variable-speed process control	Suitable with application review
Chemical process equipment	Controlled motor speed	Suitable
Paper machinery	Continuous speed control	Suitable
Material-handling equipment	High power and controlled movement	Suitable

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25. Advantages of the 20G1ALC750JN2NNNNN

25.1 High Current Capacity

The 750 A rating provides substantial electrical capacity for large industrial motors.

This makes the drive suitable for applications that are beyond the practical range of compact VFD platforms.

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25.2 High Power Capability

The 450 kW Light-Duty rating allows the drive to serve large motor systems.

The 400 kW Normal-Duty and 315 kW Heavy-Duty ratings provide additional flexibility for different load profiles.

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25.3 Three Duty Classifications

The different duty classifications allow engineers to select the appropriate operating capacity according to the actual application.

This is especially important when the motor experiences overload, high starting torque, or frequent acceleration.

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25.4 Embedded EtherNet/IP

The integrated EtherNet/IP interface makes the drive suitable for modern PLC-based control architectures.

It can communicate with the control system without requiring every operating command to be hardwired.

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25.5 Door-Mounted HIM

The JN2 configuration adds a practical local operator interface.

This can be especially useful during commissioning and maintenance.

Technicians can access the drive from the enclosure without depending entirely on a remote HMI.

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25.6 Air-Cooled Design

Air cooling provides a conventional industrial cooling arrangement that is familiar to many maintenance teams.

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25.7 Frame 8 High-Power Platform

The large Frame 8 construction provides the physical and electrical capacity required for large motors.

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25.8 MCC-Style Installation

The 800 mm deep MCC-style configuration is suitable for integration into large industrial electrical systems.

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25.9 Filtered Configuration

The filtered design provides an additional consideration for applications where electrical noise and EMC performance are important.

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25.10 Remote and Local Control Options

The combination of EtherNet/IP and a door-mounted HIM gives the system both network-control capability and a local physical interface.

This is particularly practical for industrial plants where operators may need local access while the process itself remains under PLC control.

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26. Five Recommended Related PowerFlex 755 Models

The following models are closely related to the requested 20G1ALC750JN2NNNNN.

Model	Voltage Class	Current	LD Rating	ND Rating	HD Rating	General Relationship
20G1ALC567JN2NNNNN	400 VAC	567 A	355 kW	315 kW	250 kW	Lower-capacity same-family model
20G1ALC650JN2NNNNN	400 VAC	650 A	400 kW	355 kW	315 kW	Lower-current related model
20G1ALC750JN0NNNNN	400 VAC	750 A	450 kW	400 kW	315 kW	Same electrical rating, no-HIM configuration
20G1ALC750JN4NNNNN	400 VAC	750 A	450 kW	400 kW	315 kW	Same 750 A family with different configuration
20G1ALC770JN2NNNNN	400 VAC	770 A	450 kW	400 kW	355 kW	Higher-current related model

These models are particularly useful when building a replacement list or comparing different current capacities within the same high-power PowerFlex 755 family.

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27. 20G1ALC567JN2NNNNN

The 20G1ALC567JN2NNNNN is a lower-current member of the same 400 VAC PowerFlex 755 family.

Its 567 A rating makes it suitable for applications requiring less current than the 750 A model.

Its approximate power ratings are:

• 355 kW Light Duty.
• 315 kW Normal Duty.
• 250 kW Heavy Duty.

This model can be considered where the motor current and application duty fall below the capacity required for the 750 A unit.

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28. 20G1ALC650JN2NNNNN

The 20G1ALC650JN2NNNNN is another closely related 400 VAC Frame 8 configuration.

It provides approximately:

• 650 A current.
• 400 kW Light Duty.
• 355 kW Normal Duty.
• 315 kW Heavy Duty.

It is useful where the 750 A capacity would be larger than necessary but the application still requires a large industrial PowerFlex 755 platform.

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29. 20G1ALC750JN0NNNNN

The 20G1ALC750JN0NNNNN is one of the closest alternatives because it shares the same 750 A electrical class.

Its main distinction is the operator-interface configuration.

The JN0 configuration is intended without the door-mounted HIM arrangement found on the JN2 version.

Therefore, the choice between JN0 and JN2 is particularly relevant when deciding whether the drive requires a local physical operator interface.

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30. 20G1ALC750JN4NNNNN

The 20G1ALC750JN4NNNNN is another closely related 750 A configuration.

It belongs to the same high-power 400 VAC family but uses a different configuration code.

When comparing JN0, JN2, and JN4 versions, engineers should examine the complete catalog configuration rather than assuming that the models are mechanically and functionally identical.

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31. 20G1ALC770JN2NNNNN

The 20G1ALC770JN2NNNNN provides a slightly higher current capacity than the 750 A version.

It is rated at approximately:

• 770 A.
• 450 kW Light Duty.
• 400 kW Normal Duty.
• 355 kW Heavy Duty.

The higher Heavy-Duty rating can be particularly relevant when the application has a demanding torque profile.

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32. Five Same-Brand Popular Models

The following models represent different drive sizes and product families within the same brand.

Model	Series	General Application	General Power Class
25B-D010N104	PowerFlex 525	Small pumps, fans, conveyors, machinery	Compact
25C-D010N103	PowerFlex 527	Machine automation and industrial equipment	Small / Medium
20F11NC2P1JA0NNNNN	PowerFlex 753	Industrial machinery and process equipment	Medium
20F11NC8P0JA0NNNNN	PowerFlex 753	Larger industrial motor systems	Medium / Large
20G1ALC750JN2NNNNN	PowerFlex 755	Large motors and high-power process systems	High Power

These products should not be regarded as direct replacements for one another without checking voltage, current, motor power, overload capability, enclosure configuration, and application requirements.

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33. PowerFlex 525

The PowerFlex 525 platform is aimed primarily at compact industrial applications.

Typical applications include:

• Small pumps.
• Fans.
• Conveyors.
• Packaging machinery.
• Small machine tools.
• General-purpose motor control.

It is much smaller than the 750 A PowerFlex 755 platform.

The main advantage of using a smaller drive family is that the physical installation and electrical system can be much more compact when the motor itself is small.

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34. PowerFlex 527

The PowerFlex 527 is oriented toward machine automation and applications requiring close integration between drive control and automation systems.

It can be useful in machinery where network-based control and coordinated motion-related functions are important.

Compared with the 20G1ALC750JN2NNNNN, it belongs to a much smaller power class.

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35. PowerFlex 753

The PowerFlex 753 series is intended for a broad range of industrial motor-control applications.

It can be used for:

• Pumps.
• Fans.
• Conveyors.
• Process machinery.
• Material handling.
• Industrial production equipment.

The PowerFlex 753 platform occupies a different application range from the very large Frame 8 PowerFlex 755 configuration.

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36. Why Choose the JN2 Configuration?

The JN2 configuration can be particularly attractive when a project requires a combination of:

High power

The 750 A platform provides capacity for large motors.

Local operator access

The door-mounted HIM provides a physical interface at the drive.

Network control

Embedded EtherNet/IP supports PLC-based automation.

Industrial enclosure integration

The Type 1 / IP20, 800 mm deep MCC-style arrangement is designed for protected electrical installations.

Flexible duty selection

The drive supports different LD, ND, and HD power classifications.

This combination makes the JN2 configuration useful in large industrial plants where both centralized automation and local maintenance access are required.

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37. Benefits of the Door-Mounted HIM

A physical HIM can be useful during commissioning.

For example, an engineer may need to verify drive parameters before the PLC is fully commissioned.

A maintenance technician may also need to check drive status when troubleshooting a machine.

Having the operator interface mounted on the enclosure can reduce the need to connect a separate temporary interface for routine diagnostic tasks.

It also gives maintenance personnel a direct visual and operational interface with the drive.

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38. Benefits of EtherNet/IP Integration

In a modern factory, a drive often needs to communicate more than simply a start/stop signal.

The control system may need to know:

• Whether the motor is running.
• The commanded speed.
• The actual operating condition.
• Whether a fault has occurred.
• Whether the drive is ready.
• Whether the drive has generated an alarm.
• Whether the motor current is increasing.

Network communication allows much more information to be exchanged between the drive and automation system.

This is especially valuable when a plant contains many high-power motors.

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39. Pump System Advantages

For a large pump system, variable-speed operation can allow the motor to follow the process demand.

For example, if the required water flow decreases, the drive can reduce motor speed.

This can be more efficient than continuously running the pump at maximum speed and using a mechanical restriction to reduce flow.

The actual energy performance depends on the pump design and operating conditions, but variable-speed control can provide a useful method of matching motor output to process demand.

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40. Conveyor System Advantages

A large conveyor may have significant mechanical inertia.

Starting the motor abruptly can place stress on the mechanical system.

The drive can provide a controlled acceleration profile.

This can help improve the starting behavior of the complete conveyor system.

The same principle applies during deceleration.

However, if the conveyor is heavily loaded or has a high-inertia load, the stopping energy must be evaluated carefully.

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41. Fan and Blower Advantages

Fans and blowers frequently operate under variable process requirements.

The drive can adjust motor speed to match the required airflow.

This allows the system to operate at different speeds rather than remaining at full speed all the time.

For large industrial ventilation systems, this can improve process flexibility and potentially reduce unnecessary energy consumption.

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42. Water and Wastewater Applications

Water-treatment systems often operate continuously and may contain several large pumps.

A centralized control system can use process measurements such as:

• Pressure.
• Flow.
• Tank level.
• Water demand.
• Process stage.

The PLC can calculate the required motor operating condition and send the speed command to the PowerFlex 755 through the industrial network.

The drive then controls the motor accordingly.

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43. Mining Applications

Mining equipment can place demanding requirements on motor drives.

Large conveyors may require high torque during acceleration.

Large fans may operate continuously.

Pumps may operate under changing process conditions.

Crushers and processing machines can experience changing mechanical loads.

The 20G1ALC750JN2NNNNN can be considered for these applications when the motor current, duty rating, environmental conditions, and mechanical load requirements are appropriate.

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44. Installation Requirements

The physical size of this drive means that installation planning should begin before delivery.

The installation area should provide adequate space for:

• Drive placement.
• Door operation.
• Cable installation.
• Maintenance.
• Cooling airflow.
• Electrical inspection.
• Component replacement.

The approximate 620–630 kg weight also means that lifting equipment and transportation procedures need to be planned carefully.

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45. Ventilation Requirements

Because the drive is air cooled, ventilation is an important part of the installation.

The system should prevent excessive heat accumulation.

The electrical room should be evaluated based on the total heat generated by all installed equipment.

If several large drives are installed in the same room, their combined heat load can become substantial.

The cooling system should therefore be designed for the total installation rather than for one drive alone.

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46. Cable Installation

High-power motor cable installation requires careful engineering.

Cable selection should consider:

• Motor current.
• Installation method.
• Ambient temperature.
• Cable length.
• Voltage drop.
• Conductor material.
• Applicable electrical requirements.
• EMC requirements.

Motor cables should be routed carefully in relation to control and communication cables.

Sensitive signal wiring should not be unnecessarily exposed to the electromagnetic environment created by high-power switching.

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47. Grounding and EMC

A reliable grounding system is essential for high-power drive installations.

The drive enclosure, motor frame, cabinet, grounding conductors, and cable shields should be considered as part of the overall grounding strategy.

Good grounding can help reduce:

• Electrical noise.
• Communication disturbances.
• Unwanted feedback signals.
• EMC problems.
• Drive nuisance faults.

The installed CM-jumper configuration should also be considered in conjunction with the grounding arrangement.

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48. Maintenance

A planned maintenance program should include the following areas.

Cooling System

Inspect fans, ventilation openings, and air paths.

Power Connections

Check for overheating, discoloration, or loose connections.

Grounding

Verify that grounding connections remain secure.

HIM

Check the door-mounted operator interface for physical damage and proper operation.

Network

Inspect EtherNet/IP connections and network status.

Drive Diagnostics

Review faults and warnings instead of simply resetting them.

Environmental Conditions

Check temperature, dust, moisture, oil mist, and other contaminants.

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49. Replacement Application

When replacing an existing large drive, the complete model number should be compared.

It is not sufficient to compare only:

• Voltage.
• Current.
• kW.

A replacement evaluation should also check:

• Frame.
• Enclosure.
• HIM configuration.
• Communication.
• Braking.
• Filter.
• CM jumper configuration.
• Cabinet depth.
• Cable arrangement.
• Mounting.
• Cooling.

The difference between JN0, JN2, and JN4 configurations demonstrates why the complete catalog number matters.

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50. Product Selection Table

Selection Category	20G1ALC750JN2NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Input	400 VAC, 3 Phase
Current	750 A
LD	450 kW
ND	400 kW
HD	315 kW
Frame	Frame 8
Cooling	Air cooled
Communication	Embedded EtherNet/IP
Input Type	AC input with precharge
DC Terminals	None
Filter	Filtered
CM Jumper	Installed
Enclosure	Type 1 / IP20
Installation Depth	800 mm
Installation Style	MCC style
Local Interface	Door-mounted HIM
HIM Protection	IP20 / NEMA 1
Approx. Dimensions	2450 × 600 × 800 mm
Approx. Weight	620–630 kg

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51. Detailed Related-Model Comparison

Model	Current	LD	ND	HD	Voltage	Main Difference
20G1ALC567JN2NNNNN	567 A	355 kW	315 kW	250 kW	400 VAC	Lower-capacity version
20G1ALC650JN2NNNNN	650 A	400 kW	355 kW	315 kW	400 VAC	Lower-current version
20G1ALC750JN0NNNNN	750 A	450 kW	400 kW	315 kW	400 VAC	Same electrical class, no-HIM configuration
20G1ALC750JN4NNNNN	750 A	450 kW	400 kW	315 kW	400 VAC	Same electrical class, different configuration
20G1ALC770JN2NNNNN	770 A	450 kW	400 kW	355 kW	400 VAC	Higher-current / higher-HD version

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52. Product Advantages in Practical Industrial Use

The 20G1ALC750JN2NNNNN combines several characteristics that are useful in large industrial installations.

Its high current capacity makes it suitable for large motors.

Its multiple duty ratings provide flexibility when matching the drive to different load profiles.

Its embedded EtherNet/IP communication supports centralized automation.

Its door-mounted HIM provides convenient local access.

Its air-cooled construction is familiar to industrial maintenance teams.

Its Frame 8 architecture supports high-power applications.

Its MCC-style installation format allows it to be incorporated into larger electrical distribution and automation systems.

Its filtered configuration provides additional consideration for applications where EMC performance matters.

The combination of these features makes the drive suitable for large process systems rather than small standalone machinery.

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53. Overall Technical Summary

Category	Specification
Product	20G1ALC750JN2NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product Type	High-Power AC Drive
Input Voltage	400 VAC
Phase	3 Phase
Current	750 A
Light Duty	450 kW
Normal Duty	400 kW
Heavy Duty	315 kW
Frame	Frame 8
Cooling	Air cooled
Communication	Embedded EtherNet/IP
Input	AC with precharge
DC Terminals	None
Filter	Filtered
CM Jumper	Installed
Enclosure	Type 1 / IP20
MCC Style	800 mm deep
HIM	Door mounted
HIM Rating	IP20 / NEMA 1
Dynamic Braking	No integrated braking transistor
Approx. Dimensions	2450 × 600 × 800 mm
Approx. Weight	620–630 kg
Typical Application	Large industrial motor control

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54. Final Product Description

The Allen-Bradley 20G1ALC750JN2NNNNN is a large-frame PowerFlex 755 AC variable frequency drive intended for high-power industrial motor-control applications.

With a 400 VAC three-phase input, 750 A current rating, and power capability of approximately 450 kW Light Duty, 400 kW Normal Duty, and 315 kW Heavy Duty, the unit is designed for substantial industrial motors and process equipment.

Its Frame 8 air-cooled architecture and 800 mm deep MCC-style construction make it appropriate for dedicated electrical rooms, MCC installations, industrial control areas, and other protected electrical environments.

The integrated EtherNet/IP interface allows the drive to communicate directly with an industrial automation system. This makes it suitable for PLC-controlled applications where motor speed, operating status, faults, alarms, and other information need to be exchanged between the drive and the main control system.

One of the most useful features of the JN2 configuration is its door-mounted HIM with IP20/NEMA 1 characteristics. This gives operators and maintenance technicians local access to the drive while retaining the ability to control and monitor the unit through the industrial network.

The JN2 configuration also uses an installed CM jumper, which is an important configuration difference compared with the JN0 version. This should be considered when selecting the drive for a replacement project because the grounding and EMC arrangement of the existing installation may need to be matched.

The drive uses AC input with precharge and has no external DC terminals. It is also supplied as a filtered configuration, which is relevant to industrial EMC planning.

For large pumping stations, fans, blowers, conveyors, mining systems, water-treatment equipment, material-handling machinery, chemical-process equipment, pulp and paper machinery, cement equipment, and other large industrial systems, this drive provides a combination of high current capacity and automation-oriented control.

The 750 A rating makes the unit suitable for applications where a smaller drive would not provide sufficient current capacity. At the same time, the separate Light-Duty, Normal-Duty, and Heavy-Duty ratings allow the engineer to evaluate the drive according to the actual mechanical load rather than relying only on the motor’s nominal kW value.

For applications with high inertia or frequent stopping, braking requirements should be reviewed separately because this configuration does not include an integrated dynamic braking transistor.

For installation planning, an approximate physical envelope of 2450 × 600 × 800 mm and approximate weight of 620–630 kg can be used as preliminary values. Because actual mechanical arrangements can vary according to configuration and accessories, the final mechanical documentation should be used before fabrication, transportation, lifting, or final installation.

Overall, the 20G1ALC750JN2NNNNN is a high-capacity industrial drive designed around the requirements of large motor systems. Its combination of 750 A current capability, 400 VAC three-phase operation, 450 kW Light-Duty capacity, 400 kW Normal-Duty capacity, 315 kW Heavy-Duty capacity, Frame 8 construction, air cooling, EtherNet/IP communication, filtered configuration, installed CM jumper, and door-mounted HIM makes it particularly suitable for large automated industrial equipment.

The model is especially valuable where a project requires both centralized network control and convenient local operator access. The PLC or automation system can manage the overall process, while the PowerFlex 755 handles the motor-control function and the door-mounted HIM provides a practical local interface for commissioning, inspection, and maintenance.

For engineering selection, the most important checks remain motor voltage, motor full-load current, duty classification, starting torque, overload requirements, acceleration and deceleration behavior, braking requirements, environmental conditions, ventilation, grounding, EMC, network architecture, cabinet dimensions, and available maintenance space.

When these factors are properly matched, the 20G1ALC750JN2NNNNN provides a strong high-power platform for large-scale industrial variable-speed motor applications.