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20G11JF1K4JN4NNNNN — Detailed Product Overview and Technical Specification

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1. Product Identification

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2. Product Introduction

The 20G11JF1K4JN4NNNNN is a very high-power AC variable frequency drive in the PowerFlex 755 series.

It is designed for large industrial motors where the motor power and operating current are considerably higher than those handled by ordinary compact variable frequency drives.

The unit is rated for a 690 VAC three-phase supply and has a 1,400 A current rating.

Its principal power ratings are 1,500 kW Light Duty, 1,400 kW Normal Duty and 1,120 kW Heavy Duty.

This places the model firmly in the high-power and megawatt-class motor-control category.

The product uses a large Frame 10 construction and an approximately 800 mm deep MCC-style cabinet arrangement.

It is intended for fixed industrial installations rather than small machinery or compact control panels.

The drive converts incoming fixed-frequency AC power into controlled variable-frequency output power for an AC motor.

By controlling the output frequency and voltage, it allows the motor speed and torque to be adjusted to suit the process.

This is particularly useful in industrial equipment where the motor does not need to run continuously at full speed.

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3. Brand and Series

The product belongs to the Allen-Bradley brand and the PowerFlex 755 series.

The PowerFlex 755 family is positioned toward demanding industrial motor-control applications.

Compared with smaller general-purpose drives, the PowerFlex 755 platform is designed around larger motors, more sophisticated control requirements, networking and integration into industrial automation systems.

The 20G11JF1K4JN4NNNNN represents one of the very high-capacity configurations within this family.

Its 690 VAC voltage class and 1,400 A rating make it especially appropriate for large industrial motor systems.

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4. Detailed Technical Parameters

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5. Understanding the 1,500 kW / 1,400 kW / 1,120 kW Ratings

One of the most important aspects of this drive is that it has different ratings depending on the application duty.

The largest number should not automatically be used when selecting the drive.

For example, a machine with a 1,300 kW motor may appear to fit the 1,500 kW Light Duty rating.

However, if the machine requires Heavy Duty operation, the relevant rating is substantially lower.

The motor’s actual nameplate current, overload requirements, acceleration profile and mechanical load should therefore be examined before selecting the final drive size.

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6. 690 VAC Electrical Class

The 690 VAC rating makes this model particularly suitable for large industrial motor systems.

At high motor power levels, increasing the motor voltage can help keep current within a more manageable range.

This is one reason 690 V motor systems are commonly considered for large industrial machinery.

For a drive in the 1 MW-plus range, the electrical installation is considerably more substantial than that of a small motor drive.

Large incoming cables, protection equipment, bus structures, grounding systems and motor cables all need to be properly engineered.

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7. 1,400 A Current Rating

The 1,400 A rating is one of the defining characteristics of the model.

This is a very high current level and indicates that the product is intended for large motor installations.

Such a drive can be used where the motor’s rated current is within the appropriate duty rating.

The actual motor nameplate current should always be checked rather than selecting a drive based solely on the motor’s kW rating.

This is particularly important because two motors with similar power ratings can have different current requirements depending on voltage, efficiency, power factor and operating conditions.

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8. Frame 10 Construction

The drive uses a Frame 10 configuration.

Frame size is important because it affects the physical arrangement, cooling system, power connections, service requirements and overall installation space.

A Frame 10 drive is not intended to be treated like a compact wall-mounted inverter.

It is a substantial industrial electrical assembly.

Adequate room should be allowed for:

• Power connections
• Control wiring
• Communication wiring
• Cooling airflow
• Maintenance
• Inspection
• Component replacement
• Safe electrical access

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9. 800 mm Deep MCC-Style Construction

The specified cabinet depth is 800 mm.

This is an important dimensional parameter for electrical-room planning.

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

However, the depth alone does not define the complete installation envelope.

The final height, width and weight should be checked against the applicable mechanical drawing for the exact configuration.

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10. Weight Consideration

For a drive of this power level, weight is an important engineering parameter.

The complete equipment can include the power section, cabinet structure, cooling components, control components and other installed hardware.

Therefore, the exact weight can vary according to the physical configuration.

For that reason, it is safer to specify:

Weight (kg): configuration-dependent; confirm the exact complete-unit/shipping weight from the applicable mechanical documentation.

This is preferable to assigning an unverified single number to a large cabinet that may be configured differently from one installation to another.

For transportation and installation, the actual shipping weight should be used.

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11. Cooling System

The 20G11JF1K4JN4NNNNN uses forced-air cooling.

A drive operating at this power level generates significant heat.

The cooling system removes heat from the power electronics and keeps internal components within their required operating temperature range.

Proper airflow is therefore essential.

Important installation factors include:

• Ambient temperature
• Airflow
• Cabinet ventilation
• Cooling fan condition
• Air passage cleanliness
• Installation clearance
• Room ventilation
• Altitude
• Environmental contamination

A blocked or contaminated cooling path can increase operating temperature and reduce equipment reliability.

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12. Type 12 / IP54 Enclosure

The product is configured with a Type 12 / IP54 enclosure arrangement.

This provides a more enclosed industrial configuration than an open chassis.

It is intended for appropriate industrial environments where protection against dust and other environmental factors is required.

However, Type 12/IP54 should not be interpreted as meaning that the drive can be installed in any environment.

The installation still needs to meet the applicable temperature, humidity, contamination and ventilation requirements.

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13. Embedded EtherNet/IP

The model includes embedded EtherNet/IP communication.

This is particularly useful in industrial automation systems.

The drive can participate in a networked control architecture where operating commands, references, status information and diagnostic information are exchanged between the drive and the control system.

Typical information can include:

• Start command
• Stop command
• Speed reference
• Actual speed
• Output current
• Drive status
• Fault status
• Alarm status
• Diagnostic information
• Operating condition

This makes the drive suitable for applications requiring integration with a larger automation system.

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14. Enhanced LCD and Full Numeric Interface

The JN4 configuration is associated with an enhanced LCD/full numeric human-machine interface arrangement.

This is useful for commissioning and maintenance.

A local interface can make it easier for technicians to:

• View operating parameters
• Check drive status
• Adjust settings
• Review faults
• Examine diagnostic information
• Perform commissioning procedures
• Troubleshoot operating problems

For a large industrial drive, having convenient access to diagnostic information can significantly reduce troubleshooting time.

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15. Filtering and Common-Mode Configuration

The drive uses a filtered configuration with the common-mode capacitor jumper installed.

This configuration is relevant to the electrical behavior of the drive and motor system.

Large variable frequency drives can generate high-frequency electrical components as part of their switching operation.

The overall installation should therefore consider:

• Motor cable length
• Grounding
• Cable shielding
• Motor insulation
• Electrical noise
• Common-mode currents
• Plant grounding architecture
• EMC requirements

These factors become increasingly important in large industrial installations.

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16. Dynamic Braking

The model is specified with no dynamic braking.

This is important when the connected machine has substantial rotating inertia.

When a motor decelerates, mechanical energy can be transferred back toward the drive’s DC bus.

If the application requires rapid deceleration, an appropriate braking or regenerative-energy strategy needs to be considered.

Typical high-inertia applications include:

• Large fans
• Large conveyors
• Centrifugal machines
• Mills
• Heavy rotating equipment

The absence of an internal dynamic braking arrangement does not prevent the drive from being used in such applications.

It simply means that the complete braking strategy must be designed separately according to the machine’s requirements.

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17. Main Product Applications

17.1 Large Pump Systems

The drive is well suited to large industrial pumps.

Typical applications include:

• Process-water pumps
• Cooling-water pumps
• Raw-water pumps
• Circulation pumps
• Industrial water systems
• Mining water systems
• Chemical process pumps

Variable-speed operation allows the pump to operate at a speed appropriate to the required process flow.

This can improve process control and, under suitable system conditions, reduce energy consumption.

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18. Large Fans and Blowers

Large fans are another important application.

Possible uses include:

• Industrial ventilation
• Furnace air systems
• Combustion air
• Dust collection
• Exhaust systems
• Mine ventilation
• Process cooling
• Large air-handling systems

Instead of operating continuously at maximum speed, the drive can regulate motor speed according to airflow demand.

This can provide more flexible process control.

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19. Compressor Applications

Large compressors can require hundreds or even thousands of kilowatts.

The drive can be suitable for compressor applications where the compressor manufacturer permits variable-speed operation.

Potential applications include:

• Process gas
• Industrial compressed air
• Gas handling
• Chemical processing
• Petrochemical processes
• Large industrial compressor packages

Compressor applications should be carefully evaluated because the permissible speed range and torque characteristics are specific to the compressor design.

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20. Conveyor Applications

Large conveyors can require very high motor power.

Examples include:

• Mining conveyors
• Ore conveyors
• Bulk-material conveyors
• Cement conveyors
• Port material-handling systems
• Long-distance belt conveyors

The drive can provide controlled acceleration rather than immediately applying full motor torque.

This can reduce mechanical shock and help protect:

• Belts
• Gearboxes
• Couplings
• Shafts
• Bearings
• Conveyor structures

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21. Crusher Applications

Large crushers often have high starting torque and substantial power requirements.

The drive can provide controlled motor starting and speed management.

Potential applications include:

• Primary crushing
• Secondary crushing
• Mineral processing
• Aggregate processing
• Mining
• Heavy material processing

The actual torque requirements should always be checked before final sizing.

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22. Grinding Mills

Large grinding mills can require very substantial motor power.

The drive can provide:

• Controlled acceleration
• Adjustable speed
• Motor torque control
• Process integration
• Diagnostic monitoring

Typical equipment includes:

• Grinding mills
• Ball mills
• Cement mills
• Mineral-processing mills
• Heavy material-processing equipment

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23. Steel and Heavy Manufacturing

Large steel-processing machines can contain high-power motors.

A drive in this class can be considered for applications involving:

• Large process lines
• Material handling
• Cooling equipment
• Large fans
• Pumps
• Rolling-related auxiliary equipment
• Heavy production machinery

The main benefit is the ability to control motor speed and torque rather than relying exclusively on fixed-speed motor operation.

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24. Cement and Mining Applications

The model is particularly relevant to heavy industrial sectors.

Mining and cement facilities frequently use large motors for:

• Conveyors
• Crushers
• Mills
• Fans
• Pumps
• Material handling
• Ventilation

These applications can benefit from high-power variable-speed control.

The rugged industrial construction and high-current capacity make this type of drive suitable for large plant equipment.

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25. Main Product Advantages

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26. Energy Efficiency Advantages

Variable frequency control can provide significant energy benefits in suitable applications.

This is especially true for centrifugal pumps and fans.

The relationship between speed and energy consumption means that reducing motor speed can significantly reduce power consumption in many variable-torque applications.

However, actual savings depend on the complete system.

Factors include:

• Motor efficiency
• Pump or fan efficiency
• System resistance
• Required flow
• Required pressure
• Operating hours
• Speed range
• Process demand
• Mechanical transmission losses

The drive itself does not guarantee a particular energy saving.

The saving comes from operating the motor and driven equipment at a more appropriate operating point.

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27. Mechanical Advantages

A large motor can place considerable mechanical stress on the driven machine during starting.

A variable frequency drive can provide controlled acceleration.

This can help reduce sudden mechanical loading.

Potential benefits include:

• Reduced starting shock
• Smoother conveyor starting
• Reduced belt stress
• Reduced coupling stress
• Reduced gearbox shock
• Improved process synchronization
• Better speed regulation

For large machinery, these mechanical benefits can be very important.

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28. Automation Advantages

The embedded EtherNet/IP capability makes the drive suitable for networked industrial automation.

A centralized control system can monitor the drive and issue operating commands.

For example, the automation system can manage:

• Start
• Stop
• Speed reference
• Direction
• Fault reset
• Status monitoring
• Alarm monitoring
• Diagnostic information

This allows the drive to become part of the overall production-control system rather than operating as an isolated motor controller.

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29. Maintenance Advantages

A large industrial drive represents a significant plant investment.

Maintenance should therefore be planned rather than performed only after a failure.

Recommended inspection areas include:

Regular inspection can help identify problems before they develop into major production interruptions.

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30. Installation Requirements

Because this is a 1.4 MW-class drive, installation should be carefully planned.

The electrical room needs adequate space for the drive cabinet and associated equipment.

Consideration should be given to:

• Incoming power cables
• Motor cables
• Control cables
• Communication cables
• Grounding conductors
• Ventilation
• Maintenance access
• Cabinet doors
• Service clearance
• Floor loading
• Transportation route
• Lifting equipment

The physical installation should never be designed using only the nominal cabinet depth.

The final mechanical drawing should be used to establish the complete installation envelope.

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31. Motor Selection

The motor should be checked carefully before selecting this drive.

The motor’s nameplate current is particularly important.

A drive should not be selected simply because its kW rating appears larger than the motor’s kW rating.

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32. Five Same-Series / Related Models

The following models are useful for comparison within the same PowerFlex 755 family and related high-power configurations.

The first two are especially useful when comparing different power capacities within the same 690 V platform.

The 480 V and 600 V versions are useful when the motor voltage is different.

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33. Five Same-Brand Popular/Representative Models

These models illustrate how the PowerFlex 755 family covers different industrial motor voltage classes.

The appropriate model should be selected according to motor voltage first, followed by current and duty requirements.

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34. Comparison with 20G11JF1K0JN4NNNNN

The 1K4 model is the higher-capacity configuration.

If the motor is around 1 MW, a lower-current configuration may be more economical.

If the motor approaches the upper end of the 690 V power range, the 1K4 configuration provides substantially more capacity.

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35. Comparison with 480 V Version

The two products can look similar from a mechanical perspective, but their electrical voltage classes are different.

The motor and plant distribution system therefore determine which version is appropriate.

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36. Comparison with 600 V Version

Again, the motor voltage is a fundamental selection criterion.

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37. Typical Equipment Compatibility

The product is most appropriate when the motor itself is large enough to justify a high-power Frame 10 installation.

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38. Important Advantages for Large Pumps

For a large pump system, the main advantages include:

Variable flow control

The pump can operate at a speed corresponding to the process requirement.

Reduced throttling dependence

The process can often be controlled by changing motor speed rather than relying entirely on mechanical throttling.

Controlled starting

The motor can accelerate gradually.

Process integration

Operating information can be transferred to the automation system.

Large motor compatibility

The 690 VAC and 1,400 A configuration is suitable for large motor systems.

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39. Important Advantages for Large Fans

For large fan systems, the main benefits include:

• Adjustable airflow
• Smooth starting
• Reduced mechanical stress
• Process control
• Network integration
• Potential energy savings

Fans can be particularly attractive variable-speed applications because their power requirement can change significantly with operating speed.

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40. Important Advantages for Conveyors

For conveyors, the drive can provide controlled acceleration.

This is valuable for large belts because suddenly applying full motor torque can create substantial mechanical stress.

Potential benefits include:

• Smoother belt starting
• Reduced belt shock
• Reduced gearbox stress
• Improved material handling
• Better speed coordination
• Improved process control

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41. Important Advantages for Heavy Machinery

Heavy machines frequently require a combination of high starting torque, controlled acceleration and continuous motor power.

The PowerFlex 755 architecture is suitable for this type of application because it combines:

• High current capability
• High motor power
• Variable-speed operation
• Network communication
• Local diagnostics
• Industrial enclosure construction

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42. Electrical Room Planning

The physical installation should be considered at the beginning of the project.

The following should be evaluated:

The 800 mm depth is only one part of the mechanical requirement.

The final equipment footprint should be established from the complete physical configuration.

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43. Selection Recommendations

If the motor is approximately 700 kW, a lower-power configuration may be more appropriate.

If the motor is around 800–900 kW, a smaller high-power configuration can often be considered.

For approximately 1,000 kW, the 1K0-class configuration becomes a logical comparison.

For a motor around 1,200–1,400 kW under Normal Duty, the 20G11JF1K4JN4NNNNN becomes particularly relevant.

For a Heavy Duty application, however, the approximately 1,120 kW Heavy Duty limit must be considered.

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44. Key Product Strengths at a Glance

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45. Final Technical Specification Table

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46. Overall Assessment

The 20G11JF1K4JN4NNNNN is a high-capacity PowerFlex 755 variable frequency drive designed for large industrial motor systems.

Its combination of 690 VAC operation, 1,400 A current capacity and 1,400 kW Normal Duty rating makes it suitable for applications where conventional low-power drives are not adequate.

The 1,120 kW Heavy Duty rating is particularly important for demanding machinery with significant torque or overload requirements.

The 1,500 kW Light Duty rating provides additional capacity for suitable applications with less demanding overload characteristics.

The 800 mm deep MCC-style configuration gives the product a substantial physical footprint, so the electrical-room layout, floor loading, transportation route, ventilation and maintenance space should all be considered during project planning.

The forced-air cooling system is appropriate for the high thermal load associated with a drive of this capacity.

The Type 12/IP54 enclosure arrangement provides an industrially enclosed configuration, while the embedded EtherNet/IP capability allows the drive to be integrated into a modern automation system.

The enhanced LCD and full numeric interface are useful for commissioning, local operation and troubleshooting.

The lack of dynamic braking means that applications involving high-inertia loads or rapid deceleration should receive particular attention during system design.

For a large pump, fan, conveyor, compressor, crusher, mill or other major process machine, the model can provide significant advantages through adjustable motor speed, controlled acceleration and automation-system integration.

The most important selection rule is to match the drive to the actual motor voltage, nameplate current, power, duty cycle, torque requirement and operating speed range.

For a 690 VAC motor system approaching 1.4 MW under Normal Duty conditions, the 20G11JF1K4JN4NNNNN is a particularly strong fit.

For applications requiring Heavy Duty performance, the 1,120 kW Heavy Duty rating should be used as the key reference rather than the 1,500 kW Light Duty figure.

For physical installation, the 800 mm depth should be included in the cabinet layout, while the exact overall dimensions and weight (kg) should be confirmed against the final physical configuration before transportation, lifting and installation.