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Allen-Bradley 20G14TC770JN0NNNNN PowerFlex 755 AC Drive

1. Product Overview

The Allen-Bradley 20G14TC770JN0NNNNN is a high-power PowerFlex 755 air-cooled AC drive designed for demanding industrial motor-control applications where high output current, reliable speed control, network integration, and flexible system architecture are required.

This model belongs to the PowerFlex 750-Series and is configured as a large-frame, open-type drive with 400 VAC, three-phase operation, DC input with precharge, integrated EtherNet/IP, forced-air cooling, filtering, and an installed common-mode capacitor jumper.

With a 770 A Normal Duty rating, the drive is positioned for large motors and high-power industrial equipment. Its published ratings reach 450 kW for Light Duty, 400 kW for Normal Duty, and 355 kW for Heavy Duty, making it suitable for applications such as large pumps, fans, conveyors, compressors, material-handling systems, process equipment, and other high-power rotating machinery.

The drive uses Frame 8 construction. Because of its large electrical and mechanical size, it is normally installed as part of an industrial control cabinet, MCC-style system, or engineered drive lineup rather than being treated like a small standalone wall-mounted inverter.

The catalog number identifies a specific configuration rather than simply identifying the PowerFlex 755 family. The important characteristics represented by this configuration include the 770 A class, 400 VAC three-phase system, DC input with precharge, open-type construction, filtering, installed CM jumper, no dynamic-braking option, and no HIM display.

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2. Brand

Item	Description
Brand	Allen-Bradley
Product family	PowerFlex
Product family group	PowerFlex 750-Series
Product series	PowerFlex 755
Product type	Air-cooled AC drive
Main application	Industrial variable-frequency motor control
Model / Part Number	20G14TC770JN0NNNNN
Frame	Frame 8
Construction	Open Type
Cooling	Forced air
Control network	Embedded EtherNet/IP
Input configuration	DC Input with Precharge

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3. Product Series

The PowerFlex 755 is a high-performance drive series intended for larger industrial motor applications. Compared with compact drive families, the PowerFlex 755 platform provides a much broader range of power ratings, feedback and control options, communication capabilities, I/O expansion possibilities, and system-level integration features.

The 20G14TC770JN0NNNNN represents one of the larger standard Frame 8 configurations within the 400 VAC common-DC-bus range.

The series is particularly useful when a machine or plant needs more than simple motor-speed adjustment. It is suited to applications where coordinated motion, process control, regenerative or braking considerations, common DC-bus architecture, networked diagnostics, and detailed drive configuration are important.

For large industrial machines, the PowerFlex 755 architecture also provides a practical way to standardize drive control across multiple motor ratings. A plant can use smaller PowerFlex 755 units for auxiliary motors and larger units such as the 20G14TC770JN0NNNNN for the main drive system.

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4. Complete Technical Parameter Table

Parameter	Specification
Model / Part Number	20G14TC770JN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Family	PowerFlex 750-Series
Drive type	Air-cooled AC drive
Input voltage class	400 VAC / 540 VDC nominal
Input phase	Three-phase
Input type	DC Input with Precharge
Output current — Light Duty	832 A
Light Duty power	450 kW
Output current — Normal Duty	770 A
Normal Duty power	400 kW
Output current — Heavy Duty	642 A
Heavy Duty power	355 kW
Enclosure / construction	Open Type
Frame size	Frame 8
Cooling method	Forced air
Filtering	Filtered
CM jumper	Installed
Dynamic braking	None
Internal braking transistor	None
HIM	Blank / No HIM
Network	Embedded EtherNet/IP
Common DC bus capability	Yes
Approx. dimensions, open-type drive	2145 × 778 × 421 mm
Approx. weight	162 kg
Mounting concept	Industrial cabinet / drive lineup
Typical environment	Industrial
Duty selection	Light Duty / Normal Duty / Heavy Duty
Intended motor application	Large industrial motors
Product status	Active

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5. Electrical Rating

The most important characteristic of the 20G14TC770JN0NNNNN is its high-current capability.

The drive provides a 770 A Normal Duty output rating and a maximum published Light Duty rating of 832 A. Under Heavy Duty conditions, the rated current is 642 A.

This distinction is important because the same physical drive can be used for different types of loads. A relatively steady-load application may be able to use the higher Light Duty rating, while applications involving frequent acceleration, higher overload requirements, or significant torque demand may need to be selected according to the Heavy Duty rating.

Duty Rating	Continuous Current	Approx. Power Rating
Light Duty	832 A	450 kW
Normal Duty	770 A	400 kW
Heavy Duty	642 A	355 kW

The drive should therefore not be selected solely according to the motor’s nameplate horsepower or kilowatt rating. The actual load profile, acceleration requirements, overload requirements, ambient conditions, and operating cycle should also be considered.

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6. 400 VAC Three-Phase Operation

The 20G14TC770JN0NNNNN is intended for a 400 VAC three-phase system.

This voltage class is widely used in industrial installations, particularly in Europe, Asia, and other regions using approximately 400 V three-phase distribution.

The 400 VAC class also corresponds to a nominal DC bus voltage around 540 VDC, making the DC-input configuration useful in systems where several drives share a common DC bus.

For a new installation, the incoming electrical system should be checked carefully against the drive configuration, transformer arrangement, short-circuit conditions, grounding arrangement, protection requirements, and applicable electrical standards.

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7. DC Input with Precharge

One of the most significant characteristics of this particular model is the DC Input with Precharge configuration.

Instead of being selected simply as a conventional AC-input drive, this configuration is intended for systems where the drive’s DC bus can be supplied through an appropriate DC power architecture.

This makes the model particularly useful for common DC-bus systems, engineered drive systems, and installations where multiple drive sections share a DC supply structure.

The precharge function is important because a large DC bus contains substantial capacitance. When power is initially applied, uncontrolled charging can produce a very high inrush current. The precharge system manages this initial charging process before normal operation.

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8. Common DC-Bus Applications

The 20G14TC770JN0NNNNN is particularly attractive for high-power common-DC-bus applications.

In a common-DC-bus system, multiple drives can share a common DC power structure. This can be beneficial in machines where several motors operate together and where energy can be transferred between different drive sections.

For example, during one portion of a machine cycle, one motor may be accelerating while another motor is decelerating. Instead of treating every motor completely independently, the common DC bus can provide a shared electrical energy path.

This architecture can potentially improve overall system efficiency and reduce unnecessary energy losses, depending on the application design.

Typical common-bus applications include:

• Large conveyors
• Hoisting systems
• Cranes
• Material-handling systems
• Rolling equipment
• Processing lines
• Large fans
• Large pumps
• Multi-motor production machinery
• Test stands
• High-inertia machinery

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9. Filtering and CM Jumper Configuration

The J configuration in the catalog number indicates that the drive is supplied with the filtering/common-mode capacitor jumper arrangement installed.

For this model, the published configuration is:

Parameter	Configuration
Filtering	Filtered
Common-mode capacitor jumper	Installed
Catalog-number position	J
EMC-oriented configuration	Included
Model / Part Number	20G14TC770JN0NNNNN

The filtering configuration is important when the drive is installed in an industrial environment containing sensitive control equipment, communication equipment, instrumentation, PLC systems, sensors, and other electronic devices.

The exact grounding and EMC installation method remains important. A drive with an appropriate filter configuration still needs correct cabinet construction, cable routing, grounding, motor-cable practices, shielding, and installation procedures.

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10. Embedded EtherNet/IP

The 20G14TC770JN0NNNNN includes embedded EtherNet/IP.

This is an important feature for modern industrial automation because the drive can become part of a plant-wide control network rather than functioning as an isolated motor controller.

EtherNet/IP integration can be used for:

• Drive commands
• Speed references
• Start/stop control
• Status monitoring
• Fault information
• Alarm information
• Drive parameter access
• Diagnostic information
• Production-system integration
• PLC-based control
• HMI monitoring
• Supervisory control

For a large drive installation, network integration can substantially reduce the amount of hardwired status and command wiring required.

It also allows operators and maintenance personnel to obtain drive information through the control system instead of physically standing next to the drive.

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11. HIM Configuration

This particular catalog number is supplied with a Blank / No HIM configuration.

Feature	Specification
HIM	No HIM
Local keypad	Not included
Local display	Not included
Network control	Supported
Remote configuration	Supported through suitable control architecture
Model / Part Number	20G14TC770JN0NNNNN

This configuration is useful in installations where the drive is intended to be controlled primarily through a PLC, HMI, network, or centralized automation system.

It can also make sense in large drive cabinets where the operator interface is already located elsewhere.

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12. Dynamic Braking Configuration

The catalog configuration specifies None for the dynamic-braking option.

Therefore, this model should not be treated as a drive with an integrated dynamic-braking transistor.

This is particularly important for high-inertia machinery.

If the driven load needs rapid deceleration, the system designer must evaluate how regenerative energy will be handled. Depending on the application, possible system approaches can include regenerative hardware, a suitable braking architecture, controlled deceleration, mechanical braking, or another engineered energy-management method.

The correct solution depends heavily on motor inertia, speed, stopping time, load direction, and operating cycle.

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13. Mechanical Specifications

The 20G14TC770JN0NNNNN is a Frame 8 drive.

It is physically much larger than compact PowerFlex products. The open-type drive is approximately:

2145 mm high × 778 mm wide × 421 mm deep

The approximate weight is 162 kg.

Mechanical Parameter	Specification
Model / Part Number	20G14TC770JN0NNNNN
Frame	Frame 8
Construction	Open Type
Approx. height	2145 mm
Approx. width	778 mm
Approx. depth	421 mm
Approx. weight	162 kg
Cooling	Forced air
Installation	Cabinet / industrial lineup
Handling	Mechanical lifting / suitable handling equipment recommended

These dimensions should be treated as engineering reference values for the open-type drive itself. Actual cabinet dimensions, clearance requirements, bus arrangements, wiring compartments, cooling equipment, and installation hardware can make the complete system substantially larger.

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14. Weight and Installation Considerations

At approximately 162 kg, this is not a small serviceable component that should be handled manually by one person.

The installation should be planned around appropriate lifting and positioning equipment.

Large Frame 8 systems also require attention to:

• Cabinet structure
• Mounting points
• Floor loading
• Cable-entry arrangements
• DC bus connections
• Motor cable routing
• Grounding
• Ventilation
• Service access
• Cooling-air circulation
• Maintenance clearance

A large drive can be electrically suitable while still being mechanically unsuitable for a particular cabinet. Therefore, physical engineering should be performed at the same time as electrical selection.

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15. Cooling System

The drive uses forced-air cooling.

High-power semiconductor devices generate significant heat during operation. The forced-air system moves cooling air through the drive to remove heat from the power section.

For a drive in the 400 kW class, cabinet thermal management becomes an important part of system design.

The installation should provide:

• Adequate airflow
• Appropriate cabinet ventilation
• Correct intake and exhaust paths
• Clean cooling air
• Adequate service clearance
• Protection against excessive dust
• Protection against corrosive contaminants
• Proper fan maintenance

The cooling system should not be considered separately from the cabinet design. If the cabinet restricts airflow, the drive’s thermal performance can be affected.

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16. Environmental Considerations

Industrial environments can be significantly more demanding than ordinary commercial electrical rooms.

The drive should be installed in an environment appropriate for its open-type construction and within the environmental limits specified for the complete installation.

Important environmental factors include:

Environmental Factor	Design Consideration
Ambient temperature	Must remain within the applicable drive rating
Humidity	Avoid condensation
Dust	Prevent excessive contamination
Oil mist	Avoid direct exposure
Corrosive gases	Evaluate carefully
Cooling air	Keep airflow clean and unobstructed
Vibration	Evaluate for heavy machinery installations
Altitude	Check applicable derating requirements
Cabinet temperature	Maintain within acceptable limits

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17. Application: Large Pumps

The 20G14TC770JN0NNNNN is well suited to large pump systems.

Examples include:

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

Variable-speed control allows the motor speed to be adjusted according to process requirements rather than simply running at full speed continuously.

For centrifugal pumps, speed control can provide substantial process flexibility and can reduce energy consumption when full flow is not required.

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18. Application: Large Fans and Blowers

Large fans and blowers are another strong application area.

Examples include:

• Industrial ventilation
• Furnace ventilation
• Exhaust systems
• Dust collection
• Cement plants
• Steel mills
• Mining ventilation
• HVAC process systems
• Large combustion-air systems

The drive can provide controlled acceleration and adjustable operating speed, helping operators match airflow to process requirements.

This is particularly useful in systems where demand changes throughout the production cycle.

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19. Application: Conveyors

High-power conveyors can place significant demands on a motor drive.

The 20G14TC770JN0NNNNN can be considered for:

• Mining conveyors
• Bulk-material conveyors
• Ore-handling systems
• Port conveyors
• Cement conveyors
• Aggregate conveyors
• Long-distance belt conveyors
• Heavy industrial transfer systems

The drive’s high current capacity is particularly relevant where the conveyor is heavily loaded or where significant acceleration torque is required.

For long conveyors, coordinated control between multiple motors can also be important.

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20. Application: Mining

Mining equipment often requires large motors and robust variable-speed control.

Potential applications include:

• Ore conveyors
• Crushers
• Fans
• Pumps
• Material-handling systems
• Grinding-related auxiliary systems
• Ventilation systems
• Processing equipment

The high current capacity of the 770 A model gives engineers substantial room for large motor applications.

However, the final drive selection should always consider the actual load characteristics rather than simply choosing the largest available drive.

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21. Application: Cement and Aggregate Processing

Cement and aggregate plants contain many large rotating machines.

The drive can be considered for:

• Large fans
• Material conveyors
• Pumps
• Crushers
• Process machinery
• Dust-control systems
• Bulk-material handling

In these environments, cabinet cooling, dust management, maintenance access, and electrical protection become especially important.

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22. Application: Steel and Metal Processing

Large metal-processing machines can have demanding acceleration and torque requirements.

Potential applications include:

• Cooling systems
• Process fans
• Pumps
• Conveyors
• Material-handling machinery
• Auxiliary rolling equipment
• Large process motors

For these applications, engineers normally pay particular attention to acceleration profiles, overload requirements, motor inertia, regenerative energy, and coordination between multiple drives.

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23. Application: Paper and Pulp

Paper production often involves multiple motors operating as part of a coordinated production line.

The PowerFlex 755 platform can be useful for:

• Fans
• Pumps
• Roll drives
• Material handling
• Process equipment
• Large auxiliary machinery

Network connectivity is particularly useful in production lines where the drive must exchange operating data with a central automation system.

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24. Application: Compressors

Large compressors can require substantial starting torque and controlled acceleration.

The drive can be considered for industrial compressor applications where variable-speed control is required.

Important design considerations include:

• Compressor type
• Starting torque
• Operating speed range
• Load profile
• Acceleration time
• Motor rating
• Cooling requirements
• Harmonic considerations
• Bypass requirements

The drive should be selected based on the compressor’s actual torque-speed characteristics rather than only its nominal motor kW.

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25. Main Product Advantages

High Power Capacity

One of the most obvious advantages is the high current capability.

At 770 A Normal Duty, this model can support very large motors.

Its published ratings of 450 kW LD, 400 kW ND, and 355 kW HD provide multiple operating-duty possibilities.

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Common DC-Bus Compatibility

The DC-input configuration makes the model particularly useful in engineered common-DC-bus systems.

This can be valuable where several motors operate together and energy sharing between drive sections is desirable.

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Embedded EtherNet/IP

Built-in EtherNet/IP simplifies integration into networked automation architectures.

This can reduce hardwired control requirements and provide better access to operational and diagnostic information.

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Large Motor Compatibility

The 770 A class places the drive in a range suitable for large industrial motors.

This makes it appropriate for central production equipment rather than only small auxiliary machinery.

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Flexible Duty Selection

The drive has separate Light Duty, Normal Duty, and Heavy Duty ratings.

This gives engineers a more practical method of matching the drive to the actual load profile.

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Industrial PowerFlex 755 Architecture

The PowerFlex 755 platform is designed for demanding industrial applications where simple speed control is not enough.

Its larger system architecture supports complex automation and drive-system requirements.

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Filtered Configuration

The installed filtering and CM-jumper configuration can help support appropriate EMC performance when the complete installation is correctly engineered.

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No HIM Configuration

For centralized automation systems, eliminating the local HIM can be useful when operators control the machine from an HMI or supervisory system.

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26. Advantages for System Integrators

For system integrators, the 20G14TC770JN0NNNNN offers several practical advantages.

First, the large PowerFlex 755 platform can serve as a standardized drive platform for complex industrial machines.

Second, embedded EtherNet/IP makes it easier to integrate the drive into a modern PLC-based architecture.

Third, the DC-input configuration can simplify the architecture of a common-bus system when the overall electrical design is based around shared DC power.

Fourth, the large Frame 8 construction provides a clear foundation for engineered cabinet and MCC installations.

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27. Advantages for OEM Machine Builders

For OEMs building large machines, standardization can be very valuable.

Using a common drive platform across different machine sizes can reduce engineering complexity.

The 20G14TC770JN0NNNNN can serve as a high-power member of a standardized PowerFlex architecture, while smaller PowerFlex 755 models can be used for auxiliary motors.

This can simplify:

• Programming
• Operator training
• Spare-parts management
• Maintenance procedures
• Network architecture
• Documentation
• Commissioning

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28. Advantages for Plant Operators

From an operator’s perspective, networked drive control provides access to useful operating information.

Depending on the control system, operators can monitor:

• Motor speed
• Drive status
• Current
• Fault conditions
• Alarm conditions
• Operating commands
• Process-related information

This can reduce the need for local manual intervention.

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29. Advantages for Maintenance Personnel

Maintenance teams benefit from a drive that can be integrated into a plant network.

When a fault occurs, the control system can potentially provide information that helps technicians determine whether the problem is associated with:

• Motor loading
• Drive operation
• Acceleration
• Overcurrent
• Temperature
• Communication
• Control commands
• External interlocks

This can shorten troubleshooting time.

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30. Five Recommended Models from the Same PowerFlex 755 TC Series

The following models are particularly relevant when comparing current and power requirements around the 20G14TC770JN0NNNNN.

Model / Part Number	Light Duty	Normal Duty	Heavy Duty	Frame	Voltage
20G14TC460JN0NNNNN	540 A / 315 kW	460 A / 250 kW	385 A / 200 kW	8	400 VAC
20G14TC540JN0NNNNN	585 A / 315 kW	540 A / 315 kW	456 A / 250 kW	8	400 VAC
20G14TC567JN0NNNNN	612 A / 355 kW	567 A / 315 kW	472 A / 250 kW	8	400 VAC
20G14TC650JN0NNNNN	750 A / 400 kW	650 A / 355 kW	540 A / 315 kW	8	400 VAC
20G14TC750JN0NNNNN	796 A / 450 kW	750 A / 400 kW	585 A / 315 kW	8	400 VAC

These models are useful when the 770 A unit is larger than necessary.

The 20G14TC650JN0NNNNN, for example, provides a lower current rating while retaining the same basic 400 VAC Frame 8 common-bus concept.

The 20G14TC750JN0NNNNN is particularly close to the 770 A model and can be a useful comparison when the required Normal Duty current is approximately 750 A rather than 770 A.

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31. Detailed Comparison of the Same-Series Models

Model / Part Number	LD Current	LD Power	ND Current	ND Power	HD Current	HD Power	Frame	Approx. Dimensions	Weight
20G14TC460JN0NNNNN	540 A	315 kW	460 A	250 kW	385 A	200 kW	8	Configuration dependent	Configuration dependent
20G14TC540JN0NNNNN	585 A	315 kW	540 A	315 kW	456 A	250 kW	8	Configuration dependent	Configuration dependent
20G14TC567JN0NNNNN	612 A	355 kW	567 A	315 kW	472 A	250 kW	8	Configuration dependent	Configuration dependent
20G14TC650JN0NNNNN	750 A	400 kW	650 A	355 kW	540 A	315 kW	8	Configuration dependent	Configuration dependent
20G14TC750JN0NNNNN	796 A	450 kW	750 A	400 kW	585 A	315 kW	8	Configuration dependent	Configuration dependent
20G14TC770JN0NNNNN	832 A	450 kW	770 A	400 kW	642 A	355 kW	8	Approx. 2145 × 778 × 421 mm	Approx. 162 kg

The dimensions and weight of the smaller comparison models can vary according to exact construction and packaging configuration, so it is better to verify the mechanical drawing for the exact catalog number before cabinet fabrication.

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32. Five Related PowerFlex 755 Models for 690 VAC Applications

For projects using a higher-voltage industrial supply, the following PowerFlex 755 configurations are useful reference models.

Model / Part Number	Voltage	Normal Duty	ND Power	Heavy Duty	HD Power	Frame	Dynamic Braking
20G14NF119JA0NNNNN	690 VAC	119 A	110 kW	98 A	90 kW	6	DB transistor
20G14NF142JA0NNNNN	690 VAC	142 A	132 kW	119 A	110 kW	6	DB transistor
20G14NF171JA0NNNNN	690 VAC	171 A	160 kW	142 A	132 kW	7	DB transistor
20G14NF212JA0NNNNN	690 VAC	212 A	200 kW	171 A	160 kW	7	DB transistor
20G14NF263JA0NNNNN	690 VAC	263 A	250 kW	212 A	200 kW	7	DB transistor

For reference, Frame 6 PowerFlex 755 open-type construction is approximately 308.0 × 665.5 × 346.4 mm and approximately 38.6 kg, while Frame 7 configurations are approximately 430.0 × 881.5 × 349.6 mm, with weight depending on the exact configuration.

Frame	Approx. Dimensions	Approx. Weight
Frame 6	308.0 × 665.5 × 346.4 mm	38.6 kg
Frame 7	Approx. 430.0 × 881.5 × 349.6 mm	Approx. 72.6–108.9 kg
Frame 8	Approx. 2145 × 778 × 421 mm	Approx. 162 kg

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33. Five Popular Allen-Bradley Models for Comparison

The following models are useful examples from the same broader drive brand but cover considerably smaller power ranges.

Model / Part Number	Product Series	Voltage Class	Current Class	Approx. Power Class	Typical Use	Dimensions	Weight
25B-D017N114	PowerFlex 525	480 VAC	17 A	Approx. 7.5 kW class	Pumps, fans, conveyors	Configuration dependent	Configuration dependent
25B-D024N114	PowerFlex 525	480 VAC	24 A	Approx. 11 kW class	Machine drives, pumps, fans	Configuration dependent	Configuration dependent
25B-D030N114	PowerFlex 525	480 VAC	30 A	Approx. 15 kW class	General industrial machinery	Configuration dependent	Configuration dependent
20G11NC5P0JA0NNNNN	PowerFlex 755	480 VAC	50 A class	Approx. 37–45 kW class	Industrial process equipment	Configuration dependent	Configuration dependent
20G11NC072JA0NNNNN	PowerFlex 755	480 VAC	72 A class	Approx. 55 kW class	Pumps, fans, conveyors	Configuration dependent	Configuration dependent

These models are not direct replacements for the 20G14TC770JN0NNNNN. They are included to show how the product family can cover a very broad range of motor sizes.

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34. 650 A vs. 750 A vs. 770 A Selection

When the application is close to the upper end of Frame 8 ratings, the differences between the 650 A, 750 A, and 770 A models become important.

Model / Part Number	Normal Duty Current	Normal Duty Power	Heavy Duty Current	Heavy Duty Power
20G14TC650JN0NNNNN	650 A	355 kW	540 A	315 kW
20G14TC750JN0NNNNN	750 A	400 kW	585 A	315 kW
20G14TC770JN0NNNNN	770 A	400 kW	642 A	355 kW

The 770 A model becomes particularly attractive when the motor current is close to the 750 A range or when additional current capacity is needed for the selected duty classification.

However, using a larger drive than necessary does not automatically make an installation better. Motor nameplate current, overload requirements, acceleration torque, ambient temperature, and operating cycle should all be considered.

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35. Motor Selection Considerations

For a 400 kW-class motor, the drive selection should begin with the motor nameplate rather than the motor’s nominal kW value alone.

Important motor information includes:

• Rated voltage
• Rated current
• Rated frequency
• Rated speed
• Power factor
• Efficiency
• Motor type
• Starting requirements
• Maximum speed
• Base speed
• Encoder or feedback requirements
• Load inertia

The 770 A rating gives the drive substantial capacity, but the final motor compatibility should still be checked against the actual motor characteristics.

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36. High-Inertia Load Considerations

Large conveyors, centrifuges, fans, flywheels, and some processing machines can have substantial inertia.

High inertia affects:

• Acceleration time
• Deceleration time
• Drive current
• Regenerative energy
• Mechanical stress
• Braking requirements
• Motor temperature

Because the 20G14TC770JN0NNNNN does not include the specified dynamic-braking option, high-inertia applications should be analyzed carefully before selecting the final system architecture.

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37. Cabinet Design

The open-type construction means the drive should generally be considered as a component inside an appropriate electrical enclosure or engineered drive system.

The cabinet design should address:

1. Physical mounting.
2. DC bus arrangement.
3. Motor cable routing.
4. Control wiring.
5. Network wiring.
6. Grounding.
7. Cooling airflow.
8. Maintenance access.
9. Service clearance.
10. Protection against environmental contamination.
11. Cable bending radius.
12. Heat dissipation.

Because the drive is approximately 2.1 m tall, cabinet layout should be considered early in the project.

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38. Thermal Management

Thermal design is one of the most important issues with a 400 kW-class drive.

The cabinet designer should calculate the heat generated by:

• Drive power electronics
• Cooling fans
• DC bus components
• Input equipment
• Output equipment
• Other drives
• Transformers
• Contactors
• Auxiliary power supplies

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

The cabinet may therefore require engineered forced ventilation or another suitable thermal-management approach.

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39. Maintenance Recommendations

For a large PowerFlex 755 installation, maintenance should focus on the complete drive system rather than only the drive electronics.

Recommended inspection areas include:

• Cooling fans
• Air passages
• Electrical connections
• Grounding connections
• DC bus connections
• Motor connections
• Cabinet ventilation
• Filters
• Network connections
• Signs of overheating
• Dust accumulation
• Mechanical vibration
• Fault history

Maintenance intervals should be determined according to operating conditions and the manufacturer’s applicable maintenance recommendations.

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40. Spare Parts Planning

Because this is a large and critical industrial drive, spare-parts planning can be important.

A plant using several similar PowerFlex 755 units may benefit from standardizing selected replacement components.

Potential spare-part considerations include:

• Cooling fans
• Control components
• Communication-related components
• I/O components
• Power components
• Fuses and protection devices
• Cabinet cooling equipment
• Network accessories

For mission-critical production equipment, the spare-parts strategy should be based on the consequences of downtime rather than simply on the purchase price of the drive.

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41. Practical Application Selection

Application	Suitability	Main Reason
Large water pump	Excellent	High current and variable-speed control
Large process pump	Excellent	Large motor capacity
Large industrial fan	Excellent	Variable-speed airflow control
Mining conveyor	Excellent	High-power motor control
Cement conveyor	Excellent	High current capacity
Material-handling system	Excellent	Large motor applications
Steel-process auxiliary drive	Very good	High-power industrial control
Paper-process machinery	Very good	Networked drive architecture
Large compressor	Very good	Controlled acceleration and speed
Small machine motor	Poor choice	Drive is significantly oversized

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42. Five Same-Series Alternatives — Selection Logic

The five TC-series alternatives can be viewed as a progression of current capacity.

Model / Part Number	Normal Duty Current	Relative Position
20G14TC460JN0NNNNN	460 A	Lower
20G14TC540JN0NNNNN	540 A	Lower-medium
20G14TC567JN0NNNNN	567 A	Medium
20G14TC650JN0NNNNN	650 A	High
20G14TC750JN0NNNNN	750 A	Very high
20G14TC770JN0NNNNN	770 A	Highest in this comparison

This makes the 770 A model a logical choice when the required Normal Duty current is close to the upper end of the Frame 8 range.

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43. Why Choose 20G14TC770JN0NNNNN?

The 20G14TC770JN0NNNNN makes sense when several requirements come together:

• 400 VAC three-phase system
• Large motor
• Approximately 400 kW Normal Duty requirement
• Up to 770 A Normal Duty current
• Common DC-bus architecture
• DC input with precharge
• EtherNet/IP integration
• Forced-air cooling
• Filtered configuration
• Frame 8 construction
• Centralized automation control
• No requirement for an integrated HIM
• No requirement for the specified dynamic-braking option

It is especially appropriate for engineered industrial systems rather than small standalone machinery.

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44. Product Positioning

The 20G14TC770JN0NNNNN sits toward the high-power end of the PowerFlex 755 range.

It is not a general-purpose small inverter.

It is intended for applications where the motor and machine themselves are large enough to justify a Frame 8 industrial drive system.

Its combination of high current capacity, DC-input architecture, EtherNet/IP, forced-air cooling, and PowerFlex 755 control architecture makes it a strong candidate for centralized, networked industrial drive systems.

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45. Final Technical Parameter Table

Category	Parameter	Specification
Identification	Model / Part Number	20G14TC770JN0NNNNN
Brand	Brand	Allen-Bradley
Family	Product Family	PowerFlex
Series	Product Series	PowerFlex 755
Series Group	Product Group	PowerFlex 750-Series
Product Type	Drive	Air-Cooled AC Drive
Voltage	AC Voltage	400 VAC
Phase	Input / System	Three-phase
DC Bus	Nominal DC Class	540 VDC
Input	Input Type	DC Input with Precharge
Light Duty	Current	832 A
Light Duty	Power	450 kW
Normal Duty	Current	770 A
Normal Duty	Power	400 kW
Heavy Duty	Current	642 A
Heavy Duty	Power	355 kW
Frame	Frame Size	Frame 8
Enclosure	Construction	Open Type
Cooling	Cooling Method	Forced Air
Filtering	Filter	Filtered
CM Configuration	CM Jumper	Installed
Communication	Network	Embedded EtherNet/IP
HIM	Local Interface	Blank / No HIM
Dynamic Braking	DB	None
Braking Transistor	Internal DB Transistor	None
Dimensions	Height	Approx. 2145 mm
Dimensions	Width	Approx. 778 mm
Dimensions	Depth	Approx. 421 mm
Mechanical	Approx. Weight	Approx. 162 kg
Application	Motor Range	Large industrial motors
Architecture	DC Bus	Suitable for common-DC-bus systems
Installation	Typical Location	Industrial cabinet / drive lineup
Duty	Available Rating Classes	LD / ND / HD
Network Integration	Automation	EtherNet/IP-based integration

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46. Final Product Assessment

The Allen-Bradley 20G14TC770JN0NNNNN PowerFlex 755 is a high-power industrial AC drive designed for large motor applications and engineered drive systems.

Its 770 A Normal Duty rating and 400 kW Normal Duty capacity put it firmly into the large industrial-drive category. The 832 A Light Duty rating and 642 A Heavy Duty rating provide additional flexibility for different load profiles.

The 400 VAC three-phase electrical class makes it suitable for industrial power systems using the 400 V class, while the DC Input with Precharge configuration makes it particularly interesting for common-DC-bus applications.

The integrated EtherNet/IP capability is another major advantage. In a modern automation system, the drive can be integrated directly into the control architecture for commands, references, status information, alarms, and diagnostics.

The filtered configuration with CM jumper installed is useful where EMC performance is important, provided the overall installation is designed correctly.

Mechanically, the drive is substantial. With an approximate open-type size of 2145 × 778 × 421 mm and an approximate weight of 162 kg, it requires proper cabinet planning, lifting arrangements, cooling design, electrical clearances, and service access.

For large pumps, fans, conveyors, mining machinery, cement equipment, material-handling systems, steel-processing equipment, paper machinery, and other high-power rotating equipment, the 20G14TC770JN0NNNNN can be a strong choice when its current and duty ratings match the actual load.

The most important point during selection is not simply the motor’s nominal kW rating. The engineer should compare the motor’s nameplate current, duty cycle, overload requirements, acceleration and deceleration requirements, inertia, braking requirements, environmental conditions, and system architecture against the drive’s actual rating.

In applications where 770 A is more capacity than necessary, the 20G14TC650JN0NNNNN or 20G14TC750JN0NNNNN may be worth evaluating. If the required current is significantly lower, the 460 A, 540 A, or 567 A TC-series models can provide a more appropriately sized solution.

Overall, the 20G14TC770JN0NNNNN is best viewed as a high-capacity, network-ready, Frame 8 industrial drive for large-scale motor-control systems where high current, common-DC-bus capability, centralized automation, and reliable forced-air cooling are important design requirements.