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Allen-Bradley 20G14NF034JN0NNNNN PowerFlex 755 AC Drive – Technical Specifications, Product Introduction, Applications, Advantages, and Related Models

1. Product Overview

The Allen-Bradley 20G14NF034JN0NNNNN is a PowerFlex 755 air-cooled AC drive designed for industrial motor-control applications where high-voltage three-phase operation, substantial motor power, DC-bus integration, and reliable variable-speed control are required.

This model belongs to the PowerFlex 755 series and is configured for 690 VAC, three-phase applications. It provides a 34 A output-current rating, a 30 kW Normal Duty rating, and a 22 kW Heavy Duty rating. The drive uses a Frame 6 mechanical platform and an open-type construction intended for installation within an appropriate electrical cabinet or enclosure.

A particularly important characteristic of the 20G14NF034JN0NNNNN is its configuration without an internal dynamic-braking transistor. This distinguishes it from the closely related 20G14NF034JA0NNNNN. The two models share the same basic voltage, current, power, frame, filtering, and DC-input architecture, but the braking configuration is different.

The drive is also configured for DC input with precharge, filtered operation, and an installed common-mode capacitor jumper. This makes the model particularly relevant to common-DC-bus and DC-powered drive architectures where multiple drive units may be integrated into a larger industrial power system.

2. Brand and Product Series

Item	Description
Brand	Allen-Bradley
Product Family	PowerFlex
Series	PowerFlex 755
Product Type	Air-Cooled AC Drive
Model	20G14NF034JN0NNNNN
Voltage Class	690 VAC
Phase	Three Phase
Output Current	34 A
Normal Duty Power	30 kW
Heavy Duty Power	22 kW
Frame Size	Frame 6
Enclosure Type	Open Type
Cooling	Air Cooled
Input Configuration	DC Input with Precharge
Dynamic Braking	None
Filtering	Filtered
CM Jumper	Installed
HIM	Blank / No HIM
Product Configuration	755 AC Packaged Drive

The product identification places this model within the PowerFlex 755 AC drive platform. The exact catalog configuration specifies 34 A, 30 kW Normal Duty, 22 kW Heavy Duty, 690 VAC, three-phase operation, Frame 6, filtered construction, an installed CM jumper, DC input with precharge, no internal dynamic-braking transistor, and no HIM.

3. Detailed Technical Parameters

Parameter	Specification
Model Number	20G14NF034JN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Drive Type	Air-Cooled AC Drive
Voltage Rating	690 VAC
Phase	3 Phase
Output Current	34 A
Normal Duty Rating	30 kW
Heavy Duty Rating	22 kW
Normal Duty Continuous Current	34 A
Normal Duty 1-Minute Current	37.4 A
Normal Duty 3-Second Current	51 A
Heavy Duty Continuous Current	30 A
Heavy Duty 1-Minute Current	45 A
Heavy Duty 3-Second Current	54 A
Input Type	DC Input with Precharge
Approximate DC-Bus Voltage Class	Approximately 932 VDC
Dynamic Braking	None
Internal Braking Transistor	No
Filtering	Yes
CM Capacitor Jumper	Installed
Cooling	Air Cooled
Enclosure	Open Type
Frame Size	Frame 6
Operator Interface	Blank / No HIM
Approximate Height	665.5 mm
Approximate Width	308 mm
Approximate Depth	346.4 mm
Approximate Weight	Approximately 14.5 kg*
Typical Installation	Industrial control cabinet
Typical Motor Application	Three-phase AC motor
Duty Classes	Normal Duty / Heavy Duty

The current and power ratings for the 690 V, 34 A configuration correspond to 30 kW Normal Duty and 22 kW Heavy Duty. The published selection data also gives 37.4 A and 51 A for the one-minute and three-second Normal Duty overload points, and 30 A, 45 A, and 54 A for the Heavy Duty continuous, one-minute, and three-second values.

*The dimensional and weight figures above should be regarded as approximate engineering references rather than final fabrication values. Mechanical drawings for the exact catalog configuration should be used for cabinet manufacturing, mounting-hole locations, service clearances, lifting arrangements, and final equipment-weight calculations. The exact product listing confirms the Frame 6 open-type construction and provides a mechanical-documentation pathway for the product.

4. Product Introduction

The 20G14NF034JN0NNNNN is intended for industrial applications where a conventional low-power variable-frequency drive is not sufficient and where the electrical system requires a higher-voltage drive architecture.

The 690 VAC rating places this model in a class commonly associated with larger industrial motors and higher-power machinery.

Its 34 A output rating gives the drive a useful position within the 690 V PowerFlex 755 range. It provides more capacity than the 30 A version while remaining below the 46 A and 50 A configurations.

The 30 kW Normal Duty rating makes the drive suitable for many continuous industrial loads, while the 22 kW Heavy Duty rating provides a separate selection point for applications with greater overload demands.

The model is not simply a standalone AC-input drive. Its DC-input-with-precharge configuration is particularly important when the drive is being integrated into a common DC-bus system or another compatible DC power architecture.

Another defining characteristic is the absence of an internal dynamic-braking transistor.

This means that the 20G14NF034JN0NNNNN is best selected when the application does not require the drive’s internal dynamic-braking transistor or when regenerative-energy management is handled through another part of the system architecture.

The combination of high voltage, 34 A current capacity, DC input with precharge, filtering, Frame 6 construction, and no internal dynamic-braking transistor gives the model a specific role within the PowerFlex 755 family.

5. 690 VAC Three-Phase Electrical Design

The 690 VAC three-phase rating is one of the most important characteristics of the 20G14NF034JN0NNNNN.

Higher-voltage motor systems can transmit a given amount of power at lower current compared with lower-voltage systems.

For larger industrial motors, this can be useful from the standpoint of electrical distribution, conductor sizing, switching equipment, and overall system architecture.

The 690 V PowerFlex 755 range includes multiple current and power steps, allowing engineers to select a drive according to the actual motor requirements rather than simply selecting the largest available unit.

The 34 A model corresponds to a 30 kW Normal Duty rating and a 22 kW Heavy Duty rating.

6. 34 A Output Capacity

The 34 A output rating is a central selection parameter for this model.

Drive sizing should not be based only on motor horsepower or kilowatt rating.

The actual motor nameplate current should be compared with the applicable drive rating, while the machine’s acceleration requirements, overload conditions, duty cycle, operating speed, ambient conditions, and mechanical load are also considered.

For Normal Duty operation, the model provides 34 A continuous output capability.

For Heavy Duty operation, the applicable continuous current is 30 A.

This difference is important because a machine with a 22 kW motor does not necessarily have the same drive requirements as another 22 kW motor. The mechanical load profile and overload requirements can be very different.

7. Normal Duty and Heavy Duty Ratings

The distinction between Normal Duty and Heavy Duty is one of the most useful aspects of this model.

Normal Duty provides a 30 kW rating.

Heavy Duty provides a 22 kW rating.

The Normal Duty rating is generally more suitable for applications with relatively moderate overload requirements, while Heavy Duty selection is intended for applications where the motor and machine can demand greater short-duration overload capability.

Duty	Continuous Current	1-Minute Current	3-Second Current	Power Rating
Normal Duty	34 A	37.4 A	51 A	30 kW
Heavy Duty	30 A	45 A	54 A	22 kW

The published 690 V selection information identifies these current and power levels for the 34 A configuration.

When selecting the drive, the engineer should first determine whether the machine is a Normal Duty or Heavy Duty application.

This prevents a common mistake in which the motor’s kW rating is matched to the drive’s kW rating without considering overload performance.

8. DC Input with Precharge

The 20G14NF034JN0NNNNN is configured for DC input with precharge.

This is a significant difference from a conventional drive that is designed primarily around direct AC input.

A DC-input drive can be integrated into a suitable common DC-bus system in which DC power is distributed to multiple drive units.

The precharge function is important because the drive’s internal DC-link capacitors require controlled charging.

Connecting a high-energy DC source directly to discharged capacitors can produce a very large initial current.

A controlled precharge sequence limits this initial charging current and allows the DC bus to reach the appropriate operating condition before normal operation begins.

For this reason, the precharge arrangement should be considered an important part of the complete power-system design rather than simply a small internal drive feature.

A common DC-bus architecture can be particularly useful when several drives operate as part of the same machine or process.

The exact DC-bus arrangement must, however, be engineered around the power source, bus voltage, protection, bus capacitance, regenerative energy, disconnect strategy, and applicable installation requirements.

9. No Internal Dynamic-Braking Transistor

The 20G14NF034JN0NNNNN has no internal dynamic-braking transistor.

This is one of the clearest identifying characteristics of the JN configuration.

The corresponding JA configuration includes the internal dynamic-braking transistor, while the JN configuration does not. The catalog structure identifies the dynamic-braking code “A” with an internal dynamic-braking transistor and “N” with no internal dynamic-braking transistor.

This difference should be considered carefully when replacing one model with another.

A drive without an internal braking transistor is not automatically unsuitable for a machine that decelerates.

The important question is how regenerative energy is handled within the complete system.

Depending on the application, regenerative energy may be managed by another system component, a regenerative architecture, a controlled deceleration strategy, or other appropriate equipment.

However, if the machine specifically requires an internal dynamic-braking transistor for a conventional external braking-resistor arrangement, the JN configuration is not the equivalent choice.

10. JA and JN Configuration Comparison

Feature	20G14NF034JA0NNNNN	20G14NF034JN0NNNNN
Voltage	690 VAC	690 VAC
Phase	3 Phase	3 Phase
Current	34 A	34 A
Normal Duty	30 kW	30 kW
Heavy Duty	22 kW	22 kW
Frame	6	6
DC Input with Precharge	Yes	Yes
Filtering	Yes	Yes
CM Jumper	Installed	Installed
Dynamic Braking Transistor	Yes	No
Cooling	Air Cooled	Air Cooled
Enclosure	Open Type	Open Type
HIM	Blank / No HIM	Blank / No HIM
Primary Selection Difference	Suitable where internal DB transistor is required	Suitable where internal DB transistor is not required

The electrical capacity of these two configurations is essentially the same at the catalog level, but the dynamic-braking configuration is different.

This makes the JN version particularly attractive for systems where braking is not required from the internal drive circuitry or is managed elsewhere.

11. Filtering and CM Jumper

The 20G14NF034JN0NNNNN is configured as filtered, with the CM jumper installed.

Filtering is an important consideration in industrial power-electronics installations because variable-frequency drives generate high-frequency switching components as part of their normal operation.

These switching components can interact with motor cables, grounding systems, cabinet structures, control wiring, and nearby electronic equipment.

A filtered configuration can therefore be useful in installations where electrical-noise management and electromagnetic compatibility are important.

The common-mode capacitor jumper configuration is also part of the catalog configuration.

The correct grounding and bonding arrangement should be determined from the complete installation design.

The drive’s filter configuration, motor cable construction, cable length, cabinet bonding, grounding system, and surrounding control equipment should all be considered together.

12. Air-Cooled Design

The 20G14NF034JN0NNNNN uses an air-cooled architecture.

Air cooling is a practical approach for industrial cabinets where appropriate ventilation and heat management can be provided.

The drive generates heat during operation, and the amount of heat generated depends on load, switching conditions, operating environment, and other factors.

For this reason, cabinet design should include a thermal calculation rather than relying only on the physical dimensions of the drive.

If several drives are installed in one cabinet, the combined thermal load can become significant.

The enclosure should provide appropriate airflow paths and should prevent hot exhaust air from being repeatedly circulated through the drive’s cooling path.

13. Frame 6 Construction

Frame 6 identifies the physical platform of the drive.

The 34 A 690 V configuration is associated with Frame 6 in the published drive selection data.

Frame size is important when planning cabinet space, cable routing, mounting, service access, cooling, and equipment handling.

For preliminary planning, the following mechanical values can be used as engineering references:

Mechanical Parameter	Approximate Value
20G14NF034JN0NNNNN Height	665.5 mm
20G14NF034JN0NNNNN Width	308 mm
20G14NF034JN0NNNNN Depth	346.4 mm
20G14NF034JN0NNNNN Approx. Weight	~14.5 kg
Frame	6
Construction	Open Type
Cooling	Air Cooled

These figures are intended for preliminary layout work only.

The exact mounting envelope, clearances, cable-entry dimensions, ventilation space, and equipment weight should be confirmed against the mechanical drawing for the exact catalog configuration before manufacturing an electrical cabinet.

This is especially important because product documentation can contain configuration-specific mechanical information.

14. Open-Type Enclosure

The drive is specified as open type.

This means the drive should normally be incorporated into a suitable protective enclosure or cabinet rather than being treated as a completely enclosed standalone field device.

This approach is common in industrial automation because the cabinet can contain the complete electrical system.

For example, a control cabinet can incorporate the drive together with circuit protection, disconnect equipment, terminals, control devices, power distribution, braking equipment where applicable, and other system components.

The open-type construction also means that environmental conditions inside the cabinet become part of the drive installation requirements.

Dust, moisture, temperature, airflow, vibration, and contamination should all be considered when designing the enclosure.

15. Blank / No HIM Configuration

The 20G14NF034JN0NNNNN is supplied with a blank operator-interface configuration.

In practical terms, this means that a standard local HIM is not included in the catalog configuration.

This can be advantageous in automated systems where the drive is normally controlled from a central machine-control system.

It can also make sense when the drive is installed inside a cabinet where direct local operation is not required.

A blank configuration can be especially appropriate when the machine’s operator interface is located elsewhere and the drive is intended to operate as one component within a larger control architecture.

16. Main Product Advantages

16.1 High-Voltage 690 VAC Capability

The 690 VAC rating makes this model suitable for industrial motor systems using high-voltage three-phase motors.

This allows the drive to address applications where a lower-voltage drive would not be appropriate.

16.2 34 A Output Rating

The 34 A rating provides a useful intermediate capacity within the 690 V family.

It is larger than the 30 A configuration and smaller than the 46 A and 50 A configurations.

This allows the drive to be selected more closely to the actual motor requirements.

16.3 30 kW Normal Duty Capacity

The 30 kW Normal Duty rating gives the drive a broad application range.

It can be considered for pumps, fans, conveyors, material-handling systems, process equipment, and other industrial machinery where the motor’s current and duty requirements fall within the drive’s applicable ratings.

16.4 22 kW Heavy Duty Capacity

The 22 kW Heavy Duty rating provides a useful option for applications with greater overload requirements.

Heavy-duty selection is particularly important when the machine requires strong acceleration, frequent load changes, or short-duration overload capability.

16.5 DC Input with Precharge

The DC-input-with-precharge architecture makes the model well suited to compatible common-DC-bus applications.

This is one of the more important advantages over a conventional standalone AC-input configuration.

16.6 No Internal Dynamic-Braking Transistor

For applications where internal dynamic braking is not required, the JN configuration avoids including a braking transistor that may not be needed.

This makes the model a logical choice when regenerative-energy handling is performed elsewhere or when the machine’s deceleration requirements do not require this internal function.

16.7 Filtered Configuration

The filtered configuration provides a useful starting point for industrial EMC design.

The filter does not eliminate the need for correct grounding, cable routing, shielding, and installation practices, but it forms part of the drive’s electrical configuration.

16.8 Frame 6 Platform

The Frame 6 design provides a substantial physical and electrical platform for industrial motor applications.

The frame size also helps engineers organize cabinet layouts and compare the model with other drives in the same family.

17. Product Applications

Conveyor Systems

The 20G14NF034JN0NNNNN can be used for industrial conveyor applications where controlled motor speed is required.

Variable-speed operation can provide smoother acceleration and deceleration compared with fixed-speed motor starting.

This can be useful for reducing mechanical shock and allowing the conveyor speed to be adjusted according to production requirements.

However, if the conveyor has high inertia or requires rapid stopping, regenerative-energy handling must be evaluated carefully because this particular JN model does not include an internal dynamic-braking transistor.

Material Handling

Material-handling equipment often requires controlled motor acceleration and speed regulation.

The drive can be considered for systems where motors need to operate at different speeds depending on the process stage.

The actual suitability depends on motor current, load profile, stopping requirements, and the complete machine control system.

Pumps

Industrial pumps can benefit from variable-speed control when process flow requirements change.

The motor speed can be adjusted to meet process demand instead of operating continuously at one fixed speed.

This can improve process flexibility and may reduce energy consumption in appropriate pump systems.

The exact benefit depends on the pump type and system operating profile.

Fans and Blowers

Large industrial fans and blowers are another suitable application category.

Speed control can allow the fan to operate according to actual process demand.

For large rotating assemblies, however, the stopping behavior must be considered because high-inertia equipment can generate regenerative energy during deceleration.

Process Machinery

The drive can be applied to a variety of industrial process machines requiring variable-speed AC motor control.

These may include rotating processing equipment, production machinery, and continuous-process equipment.

The 690 V rating is particularly relevant where the motor system itself operates at the corresponding high-voltage class.

Common-DC-Bus Systems

The DC input with precharge configuration makes this model particularly relevant to common-DC-bus architectures.

A common DC bus can allow multiple drives to share a common DC power system.

This can be advantageous in systems where several motors operate together and where the overall electrical architecture has been specifically designed around a shared DC bus.

18. Common-DC-Bus Application Advantages

In a common-DC-bus system, several drives can be connected to a common DC power architecture.

This can provide advantages in certain machine designs because the DC bus can serve multiple drive units rather than every drive operating as an entirely independent power system.

Another potential benefit is the ability to manage energy within the overall drive system.

For example, one motor may be accelerating while another motor is decelerating.

In a properly designed common-bus architecture, energy management between drive units can become more flexible than in isolated standalone systems.

The 20G14NF034JN0NNNNN is therefore especially interesting for machine builders working with multiple coordinated motors.

19. Applications Requiring Careful Braking Analysis

The absence of an internal dynamic-braking transistor does not mean the drive cannot be used in machines that decelerate.

It means the braking-energy strategy needs to be considered separately.

Applications requiring particular attention include:

• High-inertia fans.
• Large conveyors.
• Centrifugal equipment.
• Rapid-cycle machinery.
• High-speed rotating machinery.
• Machinery requiring frequent stopping.
• Material-handling systems with short stopping times.
• Equipment with substantial overhauling loads.

For these applications, the engineer should calculate or otherwise evaluate the energy returned to the DC bus during deceleration.

If the system requires a braking resistor controlled directly by an internal braking transistor, the corresponding JA configuration may be more appropriate.

If the system uses another regenerative or braking architecture, the JN configuration may still be suitable.

20. Five Closely Related Models in the Same Series

The following models are closely related 690 V PowerFlex 755 configurations.

Model	Voltage	Current	Normal Duty	Heavy Duty	Frame	Dynamic Braking
20G14NF012JN0NNNNN	690 VAC	12 A	7.5 kW	5.5 kW	6	None
20G14NF015JN0NNNNN	690 VAC	15 A	11 kW	7.5 kW	6	None
20G14NF020JN0NNNNN	690 VAC	20 A	15 kW	11 kW	6	None
20G14NF023JN0NNNNN	690 VAC	23 A	18.5 kW	15 kW	6	None
20G14NF030JN0NNNNN	690 VAC	30 A	22 kW	18.5 kW	6	None

These models provide a convenient progression for applications requiring different motor capacities while maintaining the same general JN configuration philosophy.

The 690 V family progresses through 12 A, 15 A, 20 A, 23 A, 30 A, 34 A, 46 A, 50 A, 61 A, 82 A, and higher current classes.

21. Five Larger Same-Series Models

If the 34 A drive is too small for a particular motor, the following larger models provide useful alternatives within the same general 690 V family.

Model	Voltage	Current	Normal Duty	Heavy Duty	Frame	Dynamic Braking
20G14NF046JN0NNNNN	690 VAC	46 A	37 kW	30 kW	6	None
20G14NF050JN0NNNNN	690 VAC	50 A	45 kW	37 kW	6	None
20G14NF061JN0NNNNN	690 VAC	61 A	55 kW	45 kW	6	None
20G14NF082JN0NNNNN	690 VAC	82 A	75 kW	55 kW	6	None
20G14NF098JN0NNNNN	690 VAC	98 A	90 kW	75 kW	6	None

These larger models are useful when the motor’s full-load current or application duty exceeds the 34 A class.

The 46 A and 50 A configurations are especially logical next steps when only a moderate increase in capacity is required. Larger systems can move into the 61 A, 82 A, and 98 A classes.

22. Five Same-Brand Popular / Commonly Selected Related Models

The following models represent useful and commonly considered configurations from the same brand and broader PowerFlex family.

Model	Voltage	Current	Normal Duty	Heavy Duty	Frame	Dynamic Braking
20G14NF020JA0NNNNN	690 VAC	20 A	15 kW	11 kW	6	DB Transistor
20G14NF030JA0NNNNN	690 VAC	30 A	22 kW	18.5 kW	6	DB Transistor
20G14NF034JA0NNNNN	690 VAC	34 A	30 kW	22 kW	6	DB Transistor
20G14NF050JA0NNNNN	690 VAC	50 A	45 kW	37 kW	6	DB Transistor
20G14NF061JA0NNNNN	690 VAC	61 A	55 kW	45 kW	6	DB Transistor

These models are useful comparisons because they retain the same general 690 V PowerFlex 755 family while providing different motor capacities.

The JA configuration is particularly relevant when dynamic braking is required, while the JN configuration is appropriate when an internal dynamic-braking transistor is not needed.

23. Related Model Selection Table

Model	Main Advantage	Suitable Capacity
20G14NF020JN0NNNNN	Lower-capacity JN configuration	15 kW ND
20G14NF023JN0NNNNN	Intermediate capacity	18.5 kW ND
20G14NF030JN0NNNNN	Lower capacity than target	22 kW ND
20G14NF034JN0NNNNN	Target model	30 kW ND
20G14NF046JN0NNNNN	Higher capacity	37 kW ND
20G14NF050JN0NNNNN	Higher industrial capacity	45 kW ND
20G14NF061JN0NNNNN	Large motor applications	55 kW ND

This progression makes it easier to select a drive according to the motor’s actual current and process requirements.

24. Motor Selection

Selecting the correct motor for the 20G14NF034JN0NNNNN should begin with the motor nameplate.

The most important parameters include motor voltage, full-load current, power rating, frequency, base speed, overload requirements, and the mechanical load profile.

Motor Parameter	Selection Consideration
Motor Voltage	Must be compatible with the drive output system
Motor Current	Critical parameter for drive sizing
Motor Power	Used together with current and duty
Frequency	Determines operating frequency range
Base Speed	Important for speed-control planning
Starting Torque	Important for high-load starting
Acceleration Time	Influences current demand
Deceleration Time	Influences regenerative behavior
Load Inertia	Important for stopping and braking
Duty Cycle	Determines thermal and overload requirements
Operating Environment	Influences motor and drive thermal performance

A 30 kW motor should not automatically be paired with the drive simply because the drive has a 30 kW Normal Duty rating.

The motor’s actual current and machine duty must be checked.

Likewise, a 22 kW motor can require careful Heavy Duty evaluation if it experiences severe overloads or frequent acceleration.

25. Installation and Cabinet Design

Because the drive is open type and air cooled, cabinet design is an important part of the installation.

The cabinet should provide adequate space around the drive for airflow and service access.

The approximate mechanical reference dimensions are:

Dimension	Approximate Value
20G14NF034JN0NNNNN Height	665.5 mm
20G14NF034JN0NNNNN Width	308 mm
20G14NF034JN0NNNNN Depth	346.4 mm
20G14NF034JN0NNNNN Weight	~14.5 kg

These values should be used only for preliminary planning.

The final enclosure design should be based on the exact mechanical documentation.

Particular attention should be paid to:

• Mounting clearances.
• Cooling airflow.
• Cable-entry space.
• DC-bus connections.
• Motor cable routing.
• Grounding.
• Control wiring.
• Service access.
• Cabinet heat dissipation.
• Braking or regenerative-energy equipment where required.

26. Thermal Management

Thermal management is especially important when multiple drives are installed in the same enclosure.

Every drive produces heat during normal operation.

The cabinet designer should therefore calculate the total heat generated by all power electronics.

If the cabinet becomes too hot, drive performance and component life can be affected.

Airflow should be organized so that cool air reaches the drive intake and hot air can escape without being recirculated.

The cabinet should also account for ambient temperature and any nearby equipment that generates additional heat.

27. Electrical Installation Considerations

The 20G14NF034JN0NNNNN is a high-energy industrial drive and should be treated accordingly during electrical installation.

The DC-bus architecture requires particular attention because the DC bus can remain at a hazardous voltage even after the incoming power source has been disconnected.

Appropriate isolation, discharge, verification, grounding, protective equipment, and maintenance procedures should therefore be incorporated into the machine design.

The exact installation procedure should follow the applicable product installation instructions and the electrical safety requirements for the installation.

28. Why the JN Configuration Can Be the Better Choice

The JN configuration is not simply a lower-feature version of the JA configuration.

It is a different configuration intended for a different system requirement.

If the machine does not require an internal dynamic-braking transistor, choosing the JN version can provide a cleaner match to the actual application.

This is particularly relevant in common-DC-bus systems where regenerative energy is handled at the system level.

It can also be appropriate for machines with relatively slow deceleration requirements where a dedicated dynamic-braking transistor is unnecessary.

The important principle is to select the braking architecture based on the machine’s actual energy flow rather than selecting a braking option simply because it is available.

29. When to Choose the JA Version Instead

The JA configuration becomes more attractive when the application requires an internal dynamic-braking transistor.

Typical examples include machines with:

• High rotational inertia.
• Frequent braking.
• Short deceleration times.
• Large rotating masses.
• Rapid production cycles.
• Significant regenerative energy.

In such applications, the dynamic-braking transistor can be an important part of the braking architecture.

Therefore, when comparing the 20G14NF034JN0NNNNN and 20G14NF034JA0NNNNN, the braking requirement should be one of the first selection questions.

30. Advantages for Industrial Automation Projects

The 20G14NF034JN0NNNNN offers several advantages when integrated into a properly designed industrial automation system.

Its 690 VAC rating makes it suitable for higher-voltage motor installations.

Its 34 A current rating provides a useful medium-to-large capacity within the 690 V family.

Its 30 kW Normal Duty rating gives it a broad application range.

Its 22 kW Heavy Duty rating provides a lower power selection when the application requires higher overload capability.

Its DC input with precharge configuration makes it appropriate for compatible common-DC-bus systems.

Its filtered configuration and installed CM jumper are useful for system-level electrical design.

Its open-type Frame 6 construction also provides flexibility for cabinet integration.

31. Recommended Application Matching

Application	Suitability	Main Consideration
Conveyor	High	Check stopping and regenerative energy
Pump	High	Check motor current and process speed range
Fan	High	Evaluate inertia during deceleration
Blower	High	Consider starting and stopping requirements
Material Handling	High	Evaluate overload and braking
Process Machinery	High	Match motor and duty requirements
Common DC Bus	Very High	Confirm DC-bus architecture
High-Inertia Machine	Conditional	Braking strategy must be evaluated
Rapid-Cycle Machine	Conditional	Regenerative energy requires analysis
Simple Constant-Speed Replacement	Moderate	Verify whether DC input configuration is appropriate

The model is especially attractive when the application already uses or is being designed around a DC-bus power architecture.

32. Overall Technical Profile

Category	20G14NF034JN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product	Air-Cooled AC Drive
Voltage	690 VAC
Phase	Three Phase
Current	34 A
Normal Duty	30 kW
Heavy Duty	22 kW
Input	DC Input with Precharge
Dynamic Braking	None
Filtering	Filtered
CM Jumper	Installed
Cooling	Air Cooled
Enclosure	Open Type
Frame	6
HIM	Blank / No HIM
Approx. Dimensions	665.5 × 308 × 346.4 mm
Approx. Weight	~14.5 kg
Primary Use	Industrial AC Motor Control
Special Strength	High-voltage DC-bus-oriented drive architecture

33. Final Assessment

The Allen-Bradley 20G14NF034JN0NNNNN is a high-voltage PowerFlex 755 AC drive designed for demanding industrial motor-control applications.

Its 690 VAC three-phase rating and 34 A output capability place it in a useful range for medium-to-large industrial motors.

The 30 kW Normal Duty rating provides substantial continuous operating capacity, while the 22 kW Heavy Duty rating provides a useful alternative for applications where overload capability is more important than maximum Normal Duty power.

One of the most important characteristics of this model is its DC input with precharge configuration.

This makes the drive particularly relevant to common-DC-bus systems and other compatible DC power architectures.

Another defining feature is the absence of an internal dynamic-braking transistor.

This makes the JN configuration fundamentally different from the JA configuration.

The JN version is a sensible choice when internal dynamic braking is not required or when regenerative energy is managed elsewhere in the system.

The filtered configuration and installed CM jumper provide additional flexibility for industrial electrical-system design.

The Frame 6 air-cooled open construction makes the unit suitable for integration into an industrial control cabinet, provided that appropriate thermal management, clearances, grounding, cable routing, and environmental protection are provided.

From a selection perspective, the most important parameters are not only the 34 A current rating and 30 kW Normal Duty rating.

The engineer should also consider the motor’s actual nameplate current, Heavy Duty requirements, acceleration and deceleration profile, mechanical inertia, regenerative energy, DC-bus architecture, cabinet thermal conditions, and required braking strategy.

For applications that require a 690 VAC, 34 A, 30 kW Normal Duty PowerFlex 755 drive and do not require an internal dynamic-braking transistor, the 20G14NF034JN0NNNNN is a well-defined and practical configuration.

Its strongest characteristics are its high-voltage capability, 34 A current rating, 30 kW Normal Duty capacity, 22 kW Heavy Duty capability, DC input with precharge, filtered architecture, Frame 6 construction, and suitability for industrial common-DC-bus applications.

For applications where dynamic braking is essential, the corresponding JA configuration should be evaluated instead.

For applications where dynamic braking is unnecessary and a clean DC-bus-oriented architecture is desired, the 20G14NF034JN0NNNNN provides a particularly appropriate configuration within the PowerFlex 755 family.