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PowerFlex 755 AC Drive – Model 20G11JC1K4JN0NNNNN

1. Product Overview

The 20G11JC1K4JN0NNNNN is a high-power air-cooled AC variable frequency drive designed for large three-phase industrial motors.

It belongs to the PowerFlex 755 series and is intended for demanding applications where high motor current, stable speed regulation, controlled acceleration and deceleration, industrial communication, and centralized cabinet installation are required.

This particular configuration is rated for 400 VAC, three-phase input and provides a nominal output current of 1,465 A. Its power ratings are 850 kW for Light Duty, 800 kW for Normal Duty, and 630 kW for Heavy Duty.

The drive uses a Frame 9 construction and an 800 mm deep MCC-style enclosure with Type 12 / IP54 protection. It is forced-air cooled and includes an integrated EtherNet/IP communication interface.

The product is therefore intended for large industrial installations rather than small machine applications.

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2. Brand and Series

The product hierarchy can be summarized as:

Allen-Bradley → PowerFlex → PowerFlex 750-Series → PowerFlex 755 → 20G11JC1K4JN0NNNNN

The PowerFlex 755 family is designed for larger and more demanding motor-control applications where a compact general-purpose inverter would normally not provide sufficient capacity or control flexibility.

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3. Complete Model Identification

The model number contains a large amount of configuration information.

The important characteristics associated with this configuration are:

• 400 VAC input.
• Three-phase operation.
• 1,465 A output-current class.
• 850 kW Light-Duty rating.
• 800 kW Normal-Duty rating.
• 630 kW Heavy-Duty rating.
• Frame 9.
• Air-cooled construction.
• 800 mm deep MCC-style cabinet.
• Type 12 / IP54 enclosure.
• EMC filtering.
• CM jumper installed.
• AC input with precharge.
• DC terminals.
• No dynamic braking arrangement.
• Embedded EtherNet/IP.
• Blank configuration without HIM.

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4. Main Technical Parameters

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5. Electrical Characteristics

The most important electrical characteristic of the 20G11JC1K4JN0NNNNN is its 1,465 A nominal output-current rating.

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

It is intended for large motors where current demand is significantly higher than that of conventional machine-level VFDs.

The input supply is:

400 VAC, three phase.

The drive’s nominal power rating is:

800 kW Normal Duty.

For applications requiring different overload characteristics, the rated capacity changes according to the selected duty class.

This distinction is important when selecting the drive.

A motor should not be matched only by nominal kW.

Motor full-load current, torque requirements, acceleration requirements, load inertia and overload conditions should also be considered.

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6. Light-Duty Rating – 850 kW

The Light-Duty rating is 850 kW.

This rating is suitable for applications where the motor normally operates with relatively smooth loading and where the required overload capability is less demanding.

Typical examples include:

• Large centrifugal fans.
• Large ventilation systems.
• Cooling fans.
• Large centrifugal pumps.
• Air-handling systems.
• Circulation systems.
• Process blowers.

The actual motor current should always be checked before applying the Light-Duty rating.

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7. Normal-Duty Rating – 800 kW

The Normal-Duty rating is 800 kW.

This is the main nominal power rating generally associated with the model.

Normal-Duty applications may include large industrial pumps, fans, conveyors and other process equipment where the motor has a substantial continuous load.

The 1,465 A current rating provides a very large operating range for industrial motor applications.

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8. Heavy-Duty Rating – 630 kW

The Heavy-Duty rating is 630 kW.

Heavy-Duty operation is appropriate for applications with greater overload requirements or more demanding torque characteristics.

Typical examples can include:

• Heavy conveyors.
• Mining machinery.
• Material-handling equipment.
• High-inertia rotating equipment.
• Process machinery.
• Heavy industrial production equipment.

When the machine has frequent acceleration cycles, high starting torque or large load variations, the Heavy-Duty rating should be evaluated carefully.

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9. Product Construction

The drive is a Frame 9 air-cooled packaged drive.

This is considerably larger than a compact wall-mounted VFD.

The cabinet arrangement provides space for the high-current power section and associated control and protection equipment.

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10. Dimensions

The specified cabinet depth is:

800 mm

Because the product is a packaged Frame 9 drive, the overall height and width depend on the final cabinet arrangement and configuration.

For this reason, it would be inappropriate to invent a single overall H × W × D value for every installation.

The 800 mm depth should be treated as an important planning dimension.

The final mechanical drawing should be used for cabinet height, width, clearances and cable-entry requirements.

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11. Weight

The exact weight of this type of large packaged drive can vary with the complete configuration.

The weight can be influenced by the cabinet arrangement, internal power equipment, installed options and shipping configuration.

Therefore, the correct engineering description is:

Weight: configuration-dependent.

For transportation, crane selection and floor-load calculations, the final equipment documentation should be used.

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12. Cooling System

The product uses forced-air cooling.

Large power converters generate considerable heat during operation.

The cooling system therefore plays an important role in maintaining acceptable semiconductor and cabinet temperatures.

The installation should provide:

• Adequate airflow.
• Correct ambient temperature.
• Clean ventilation paths.
• Sufficient maintenance clearance.
• Proper cabinet ventilation.
• Appropriate cooling-fan maintenance.

Dust accumulation and blocked ventilation can significantly affect the thermal performance of a high-power drive.

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13. Type 12 / IP54 Protection

The configuration uses a Type 12 / IP54 enclosure arrangement.

This provides a level of protection appropriate for many indoor industrial environments.

It is particularly useful where the equipment may be exposed to normal industrial dust and incidental moisture.

The enclosure should not, however, be treated as a substitute for appropriate environmental engineering.

Highly corrosive environments, excessive moisture, outdoor exposure and abnormal contamination require additional consideration.

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14. EMC Filter

The drive is configured with filtering.

The EMC filter helps control high-frequency electrical noise associated with power-electronic switching.

This can be particularly useful in installations containing:

• PLC systems.
• Communication equipment.
• Sensors.
• Measurement equipment.
• Industrial computers.
• Other variable-frequency drives.
• Process instrumentation.

The filter works together with correct grounding, motor-cable selection and cable routing.

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15. CM Jumper Installed

This configuration specifies the CM jumper installed arrangement.

The common-mode configuration should be considered together with the site’s electrical grounding system.

Large VFD installations should pay particular attention to:

• Motor grounding.
• Cable shielding.
• Common-mode currents.
• Motor-cable length.
• Grounding impedance.
• Electrical noise.
• Motor insulation.

Correct installation is especially important at high power levels.

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16. Embedded EtherNet/IP

The drive includes embedded EtherNet/IP communication.

This is a major advantage for modern industrial automation systems.

The communication interface can be used to exchange information such as:

• Start and stop commands.
• Speed reference.
• Frequency feedback.
• Output current.
• Drive status.
• Fault status.
• Warning information.
• Operating data.
• Diagnostic information.

This allows the drive to become part of the plant automation network rather than operating as an isolated motor controller.

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17. Human Interface

The specified configuration is:

Blank / No HIM

In other words, the catalog configuration does not include a local Human Interface Module.

This is suitable for installations where the drive is primarily controlled through an automation system.

For applications requiring frequent local operator interaction, an appropriate operator interface can be considered separately.

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18. Dynamic Braking

The specified configuration has:

No Dynamic Braking

This is important for applications involving high inertia or rapid stopping.

For example, the braking requirements of a large conveyor can be very different from those of a centrifugal fan.

Potentially demanding applications include:

• High-inertia fans.
• Large conveyors.
• Centrifuges.
• Hoisting equipment.
• Heavy rotating machinery.
• Rapid-stop applications.

The required stopping time and regenerated energy should therefore be evaluated during system design.

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19. Product Applications

Large Pumping Systems

The drive is highly suitable for large pumping applications.

Typical examples include:

• Water-transfer pumps.
• Cooling-water pumps.
• Process pumps.
• Industrial circulation pumps.
• Wastewater pumps.
• Mining dewatering pumps.
• Large utility pumps.

Variable-speed operation allows the pump motor to operate according to actual process demand.

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Large Fans

Large fans are another natural application.

Typical examples include:

• Industrial ventilation.
• Mine ventilation.
• Furnace exhaust.
• Process ventilation.
• Cooling systems.
• Dust collection.
• Large air-handling systems.

The drive can regulate fan speed instead of requiring the motor to operate continuously at one fixed speed.

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Large Blowers

The drive is suitable for large blower systems.

Applications include:

• Wastewater aeration.
• Process air.
• Combustion air.
• Industrial gas circulation.
• Pneumatic conveying.
• Large ventilation equipment.

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Heavy Conveyors

Large conveyors can benefit from controlled acceleration.

Starting a heavily loaded conveyor abruptly can place substantial stress on:

• Gearboxes.
• Couplings.
• Shafts.
• Bearings.
• Conveyor belts.
• Mechanical supports.

Variable-frequency control can provide a smoother acceleration profile.

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Mining Equipment

The large current capability makes the drive suitable for many high-power mining applications.

Examples include:

• Mining conveyors.
• Dewatering pumps.
• Ventilation fans.
• Material-handling equipment.
• Processing equipment.
• Large auxiliary machines.

Mining environments can be demanding, so cabinet installation, cooling, dust management and maintenance planning are particularly important.

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Cement and Heavy Processing

Possible applications include:

• Large process fans.
• Dust-extraction systems.
• Large pumps.
• Material conveyors.
• Blowers.
• Material-handling systems.
• Process machinery.

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Water and Wastewater

The drive can be used in large-scale water-management applications.

Examples include:

• Intake pumps.
• Transfer pumps.
• Distribution pumps.
• Wastewater pumping.
• Aeration blowers.
• Process-water systems.

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20. Main Product Advantages

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21. High Current Capacity

The most significant feature is the 1,465 A output current.

This makes the product suitable for large motors used in heavy industry.

The current rating provides substantial capacity for high-power rotating equipment.

For final motor selection, however, the actual motor nameplate current should always be compared with the applicable drive rating.

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22. Flexible Duty Classification

Another major advantage is the availability of different duty ratings.

The same drive can be considered for:

850 kW Light Duty

800 kW Normal Duty

630 kW Heavy Duty

This allows engineers to evaluate the drive according to the actual machine load rather than using only the motor’s nominal kW.

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23. Industrial Network Integration

Embedded EtherNet/IP makes the drive particularly suitable for automated production environments.

The drive can communicate operating conditions to the control system and receive commands from the control system.

This can reduce hardwired control requirements and simplify centralized monitoring.

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24. High-Power Process Control

For large pumps, fans and blowers, motor speed is often directly related to process requirements.

The drive allows the motor to operate at different speeds according to actual demand.

This provides a more flexible control strategy than simple fixed-speed motor operation.

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25. Controlled Motor Acceleration

Large motors can create significant mechanical shock during starting.

The drive can provide controlled acceleration.

This is useful for heavy machinery because it can reduce sudden mechanical loading.

The benefits may include smoother operation and reduced stress on mechanical components.

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26. Five Closely Related / Same-Series Models

The following models can be considered as comparison candidates within the same high-power PowerFlex 755 family.

Because the long catalog number contains configuration characters, the final suffix should always be checked before purchasing.

The first two models are especially close comparison choices because they retain the same basic high-power 400 VAC / Frame 9 platform.

The other variants should be selected only after confirming the exact catalog-number options required by the project.

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27. Same-Series Comparison

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28. Five Popular Models from the Same Brand

For smaller machines, compact drives from the same brand can be more economical and easier to install.

For medium industrial equipment, the PowerFlex 753 family is another suitable option.

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29. Compact Drive Comparison

The difference between a compact drive and this PowerFlex 755 configuration is substantial.

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30. Application Selection Guide

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31. Installation Requirements

A drive of this size requires careful electrical and mechanical planning.

The installation area should provide adequate room for:

• Cabinet access.
• Power cable routing.
• Motor cable routing.
• Control wiring.
• Network cables.
• Cooling airflow.
• Maintenance.
• Inspection.
• Component replacement.
• Safe electrical working space.

The 800 mm cabinet depth should be considered when designing the electrical room.

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32. Electrical Installation

The following items should be evaluated before installation:

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33. Maintenance

Large industrial drives should be maintained as part of a planned preventive-maintenance program.

Cooling

Cooling fans and airflow paths should be checked periodically.

Electrical Connections

High-current connections should be inspected for signs of overheating or loose connections.

Cabinet

The cabinet should be kept clean and free of excessive dust.

Motor Cable

Motor-cable insulation and grounding should be inspected.

Network

Communication cables and connections should be checked for reliable operation.

Fault History

Repeated alarms and faults should be investigated rather than simply reset.

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34. Important Selection Considerations

The following information should be available before final selection:

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35. Product Advantages at a Glance

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36. Recommended Use

The 20G11JC1K4JN0NNNNN should primarily be considered when the application involves a very large motor and requires variable-speed control.

It is particularly attractive for installations where the motor is part of a larger automated process.

A typical system might include:

Incoming 400 VAC power → protective equipment → PowerFlex 755 drive → large three-phase motor → pump/fan/conveyor/process machine

The drive can then communicate with the plant control system through the integrated industrial Ethernet interface.

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37. Overall Evaluation

The 20G11JC1K4JN0NNNNN is a high-capacity PowerFlex 755 AC drive intended for large industrial motors.

Its 1,465 A output current, 850 kW Light-Duty rating, 800 kW Normal-Duty rating, and 630 kW Heavy-Duty rating make it appropriate for applications that are far beyond the normal range of compact variable-frequency drives.

Its 400 VAC three-phase input, Frame 9 construction, forced-air cooling, Type 12 / IP54 enclosure, 800 mm deep MCC-style cabinet, EMC filtering, CM jumper installed configuration, and embedded EtherNet/IP provide a configuration aimed at large centralized industrial installations.

The strongest application areas are large pumps, fans, blowers, conveyors, mining equipment, water-treatment systems, material-handling equipment, cement-processing equipment and other large rotating machines.

The biggest practical advantage is the combination of very high current capacity and industrial automation functionality.

For a large process plant, this type of drive can serve as the main motor-control device while remaining integrated with the overall automation architecture.

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38. Final Technical Summary

Note on dimensions and weight: for this large Frame 9 packaged configuration, the known cabinet depth is 800 mm, while the final overall cabinet height, width and equipment weight can vary with the complete configuration. For purchasing, lifting, transportation, floor-loading and installation calculations, the final mechanical documentation for the exact unit should be used rather than an estimated weight.