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20J1F3F505LNDNNNNN — Detailed Product Specifications, Product Introduction, Applications, Advantages and Related Models

1. Product Overview

The 20J1F3F505LNDNNNNN is a high-power industrial bus-supply unit designed for large variable-speed drive systems and common DC-bus applications.

It belongs to the PowerFlex 755TM product series and is part of the PowerFlex 750 Bus Supplies product family. The unit uses an Active Front End (AFE) regenerative architecture and is designed for a 690 VAC, three-phase power system.

The configuration is an air-cooled, regenerative and low-harmonic bus supply with a Type 1 / IP21 floor-mounted enclosure and Frame 8 construction.

The model provides three principal duty ratings:

• LD: 580 kW / 580 A
• ND: 518 kW / 518 A
• HD: 426 kW / 426 A

This makes the product suitable for medium-to-high-power industrial machinery where a common DC-bus arrangement, regenerative capability and controlled input power conversion are required.

The product is not intended to be viewed simply as an ordinary standalone motor inverter. Its main role is to provide and manage the DC-bus power infrastructure for connected drive inverter sections.

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2. Brand and Product Series

Category	Information
Brand	Allen-Bradley
Product Family	PowerFlex 755T
Product Series	PowerFlex 755TM
Product Category	PowerFlex 750 Bus Supplies
Product Type	AFE Regenerative Bus Supply
Model	20J1F3F505LNDNNNNN
Voltage Class	690 VAC
Input Phase	3 Phase
Cooling	Air Cooled
Installation	Floor Mounted
Enclosure	Type 1 / IP21
Frame	Frame 8
Main Architecture	Active Front End
Regenerative Operation	Yes
Low-Harmonic Architecture	Yes
Common DC-Bus Application	Yes

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3. Main Technical Parameters

Parameter	Specification
Model	20J1F3F505LNDNNNNN
Brand	Allen-Bradley
Series	PowerFlex 755TM
Product Family	PowerFlex 750 Bus Supplies
Product Type	Air-Cooled Bus Supply
Input Type	AFE Regenerative
Input Voltage	690 VAC
Input Phase	3 Phase
LD Current Rating	580 A
ND Current Rating	518 A
HD Current Rating	426 A
LD Power Rating	580 kW
ND Power Rating	518 kW
HD Power Rating	426 kW
Dynamic Braking	None
Cooling	Air Cooled
Enclosure	Type 1 / IP21
Installation	Floor Mounted
Frame	Frame 8
EMI Protection	Standard EMI Protection
Operator Interface	Door-Mounted HIM
HIM Model	20-750-C6S
Control Platform	TotalFORCE
AFE	Yes
Regenerative	Yes
Low Harmonic	Yes
Common DC Bus	Yes
Product Category	High-Power Industrial Drive Power Supply
Approx. Overall Width	Configuration dependent; large floor-mounted cabinet
Approx. Depth	Configuration dependent; typically industrial cabinet depth
Approx. Height	Configuration dependent; approximately 2 m-class cabinet height
Approx. Weight	Approximately 700–1,000 kg class
Weight Unit	kg
Installation Environment	Industrial electrical room / controlled industrial area

The electrical ratings are the key fixed characteristics of this configuration. Mechanical dimensions and shipping weight can vary according to the complete cabinet arrangement, options and associated equipment, so the values above should be regarded as preliminary engineering values rather than final installation dimensions.

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4. Product Description

The 20J1F3F505LNDNNNNN is designed to supply a high-capacity DC bus for industrial drive systems.

The basic operating concept can be represented as:

690 VAC Three-Phase Input

↓

AFE Regenerative Bus Supply

↓

Common DC Bus

↓

Drive Inverter Sections

↓

Industrial Motors

The bus supply is therefore positioned at the front end of the drive system.

Instead of every motor drive independently converting incoming AC power, a common DC-bus system can centralize the power-conversion function and distribute DC power to several downstream inverter sections.

This approach becomes increasingly useful as the total machine power increases and when several motors need to operate as one coordinated system.

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5. Active Front End Technology

The most important electrical characteristic of this model is its Active Front End architecture.

An AFE uses controlled semiconductor switching at the input side of the power-conversion system.

Compared with a conventional uncontrolled rectifier, this arrangement provides considerably greater control over power flow between the AC supply and the DC bus.

The architecture is particularly valuable in applications requiring:

• Regenerative operation
• Controlled power flow
• High installed motor power
• Common DC-bus operation
• Energy recovery
• Improved input-power characteristics
• Coordinated operation of multiple motors

For industrial machinery with significant braking or overhauling-load operation, these characteristics can be particularly important.

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6. Regenerative Operation

The 20J1F3F505LNDNNNNN is configured for regenerative operation.

During normal motor operation, electrical energy travels from the AC supply through the bus supply and then to the motor inverter.

During deceleration, the direction of energy flow can reverse.

The motor can act as a generator and transfer mechanical energy back into the electrical system.

The basic process is:

Electrical Supply → Drive → Motor → Mechanical Load

during motoring,

and:

Mechanical Load → Motor → DC Bus → AFE → AC Supply

during regeneration.

This is especially useful for machinery with frequent acceleration and deceleration cycles.

Typical examples include cranes, hoists, large conveyors, test equipment, high-inertia machines and certain material-processing systems.

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7. Low-Harmonic Architecture

The product is also designed as a low-harmonic bus-supply configuration.

This is important for large industrial electrical installations because high-power electronic converters can have a significant influence on the electrical supply.

Input current quality becomes increasingly important as the installed drive capacity increases.

The AFE architecture provides a controlled input stage that can be used to achieve improved power-quality characteristics compared with simpler rectifier arrangements.

This can be particularly useful in installations containing:

• Multiple large drives
• Sensitive electrical equipment
• Large transformers
• Long production lines
• High-power motors
• Multiple regenerative loads

The final electrical performance still depends on the complete installation, system impedance, transformer arrangement, cabling and other connected equipment.

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8. Duty Ratings

One of the important characteristics of this model is that it has multiple duty ratings.

Duty	Current	Power
LD — Light Duty	580 A	580 kW
ND — Normal Duty	518 A	518 kW
HD — Heavy Duty	426 A	426 kW

These ratings should not be interpreted as three separate physical products.

They describe different operating-duty capabilities within the same product configuration.

The appropriate rating depends on the required load profile, continuous current, overload requirements and application conditions.

For engineering selection, the actual motor load, duty cycle and system operating profile should be evaluated rather than selecting solely on nominal motor horsepower.

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9. Product Dimensions and Weight

The 20J1F3F505LNDNNNNN is a large floor-mounted industrial unit rather than a compact panel-mounted drive.

Mechanical Parameter	Approximate Value
Model	20J1F3F505LNDNNNNN
Installation	Floor Mounted
Frame	Frame 8
Cabinet Construction	Industrial floor-standing cabinet
Width	Configuration dependent; approximately 1.0–1.5 m class
Depth	Approximately 0.7–1.0 m class
Height	Approximately 2.0–2.4 m class
Approx. Weight	700–1,000 kg
Weight	kg
Cooling	Air Cooled
Enclosure	Type 1 / IP21
Access	Front service access
Installation Area	Dedicated industrial electrical space

The exact dimensions and weight should be confirmed against the mechanical drawing of the complete configuration before transportation, foundation design or cabinet-layout work.

For a high-power floor-mounted system, cabinet width can also be affected by the selected power configuration, input arrangement and other factory options.

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10. Product Applications

10.1 Large Conveyors

Large conveyor systems can require several motors distributed along the machine.

A common DC-bus architecture can be used to coordinate the drive system and provide centralized power conversion.

Regeneration can become important when the conveyor handles a heavy load or when a large rotating mass must be decelerated.

The 20J1F3F505LNDNNNNN is therefore suitable for applications where the conveyor’s total installed motor power falls within its operating range.

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10.2 Cranes

Cranes are a classic application for regenerative drive technology.

When a crane lifts a load, electrical energy is converted into mechanical energy.

When the load is lowered, the mechanical load can drive the motor.

The motor can then return energy toward the DC bus.

An AFE bus supply provides an appropriate architecture for managing this bidirectional energy flow.

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10.3 Hoisting Equipment

Industrial hoists often have significant regenerative requirements.

The energy produced while lowering loads can be substantial, particularly with heavy loads and frequent operating cycles.

The regenerative capability of the 20J1 architecture makes it suitable for this type of application.

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10.4 Mining Machinery

Mining equipment often requires high-power motors and continuous operation.

Potential applications include:

• Mining conveyors
• Crushers
• Hoists
• Material-handling systems
• Processing equipment
• Large pumping systems
• Heavy-duty machinery

The 690 VAC input and 518 kW normal-duty rating provide a substantial amount of available drive-system capacity.

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10.5 Metal-Processing Machinery

Metal-processing equipment frequently requires multiple motors operating in a coordinated manner.

Applications can include:

• Rolling equipment
• Material handling
• Winding systems
• Unwinding systems
• Tension-control equipment
• Continuous processing machinery

A common DC-bus structure can simplify the overall electrical architecture of such systems.

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10.6 High-Inertia Machines

Machines with large rotating masses can require substantial braking energy.

Examples include:

• Large centrifuge systems
• Test equipment
• Heavy rotating machinery
• Large processing machines
• Industrial production equipment

Regenerative power conversion is useful where repeated deceleration would otherwise generate large amounts of heat in braking components.

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11. Main Product Advantages

11.1 High Power Density for Industrial Systems

With an ND rating of approximately 518 kW, the unit is suitable for industrial applications requiring several hundred kilowatts of continuous power.

It occupies a useful position between medium-power standalone drives and very large multi-megawatt bus-supply installations.

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11.2 Regenerative Energy Recovery

The AFE architecture provides controlled regenerative operation.

This is one of the most important advantages when a machine frequently decelerates or handles overhauling loads.

Energy that would otherwise need to be dissipated can be transferred back through the electrical system.

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11.3 Common DC-Bus Capability

The common DC-bus architecture makes the unit suitable for multi-drive machines.

Several inverter sections can be connected to a centralized DC power infrastructure, depending on the system design.

This can be especially useful where multiple motors need to operate together.

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11.4 Improved Energy Management

The combination of a common DC bus and regenerative input architecture provides greater flexibility in managing energy within the machine.

A regenerative motor section can potentially return energy to the DC bus while another motor section is consuming energy.

This can improve the overall energy utilization of the machine.

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11.5 690 VAC Industrial Input

The 690 VAC input class is well suited to larger industrial electrical installations.

At higher power levels, a higher voltage allows the same power to be transmitted with lower current compared with lower-voltage systems.

This can have benefits for:

• Cable sizing
• Busbar design
• Electrical losses
• Switchgear selection
• Thermal management

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11.6 Air-Cooled Design

Air cooling provides a straightforward thermal-management method for industrial installations.

It avoids the need for a liquid-cooling circuit and can simplify installation and routine service.

Adequate ventilation remains essential because the unit is a high-power electronic system.

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11.7 Door-Mounted HIM

The specified configuration includes a door-mounted HIM, identified as 20-750-C6S.

A door-mounted operator interface provides convenient access to drive-system information and configuration functions without requiring routine access to the internal cabinet.

This can be particularly useful for industrial maintenance personnel.

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12. Product Advantages Summary

Advantage	Description
High power	Up to approximately 580 kW LD rating
Normal-duty capability	Approximately 518 kW
Heavy-duty capability	Approximately 426 kW
Regeneration	Yes
AFE	Yes
Low harmonic	Yes
Common DC bus	Yes
Input voltage	690 VAC
Air cooling	Yes
Industrial enclosure	Type 1 / IP21
Floor mounted	Yes
Frame	Frame 8
Operator interface	Door-mounted HIM
Control	TotalFORCE-based architecture
Multi-drive application	Yes
Heavy industrial application	Yes

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13. Five Related Models from the Same Series

The following models are closely related 20J1 PowerFlex 755TM bus-supply configurations.

They can be considered when the required current, power rating or enclosure arrangement differs from the 20J1F3F505LNDNNNNN.

Model	Series	Voltage	LD Rating	ND Rating	HD Rating	Frame / Construction	Cooling	Enclosure	Approx. Dimensions	Approx. Weight
20J1F3F370LNDNNNNN	PowerFlex 755TM	690 VAC	426 kW / 426 A	380 kW / 380 A	339 kW / 339 A	Frame 8 class	Air	IP21 / Type 1	Large floor cabinet	Approx. 650–900 kg
20J1F3F505LNDNNNNN	PowerFlex 755TM	690 VAC	580 kW / 580 A	518 kW / 518 A	426 kW / 426 A	Frame 8	Air	IP21 / Type 1	Approx. 1.0–1.5 × 0.7–1.0 × 2.0–2.4 m	Approx. 700–1,000 kg
20J1F3F650LNDNNNNN	PowerFlex 755TM	690 VAC	467 kW / 805 A*	405 kW / 698 A*	336 kW / 579 A*	Frame dependent	Air	IP21 / Type 1	Large floor cabinet	Approx. 800–1,100 kg
20J1F3F735LNDNNNNN	PowerFlex 755TM	690 VAC	842 kW / 842 A	754 kW / 754 A	667 kW / 667 A	Larger frame	Air	IP21 / Type 1	Large floor cabinet	Approx. 900–1,300 kg
20J1F3F920LNDNNNNN	PowerFlex 755TM	690 VAC	647 kW / 1,116 A*	572 kW / 987 A*	479 kW / 826 A*	Larger frame	Air	IP21 / Type 1	Large floor cabinet	Approx. 1,000–1,400 kg

*Some catalog configurations use different current/power relationships depending on the specific configuration and duty classification. The complete catalog number should therefore be checked before using a related model for replacement.

The models above are useful for comparing different 690 V bus-supply configurations within the same general product platform.

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14. Same-Series Comparison

Parameter	20J1F3F370LNDNNNNN	20J1F3F505LNDNNNNN	20J1F3F735LNDNNNNN	20J1F3F920LNDNNNNN	20J1F3F650LNDNNNNN
Input Voltage	690 VAC	690 VAC	690 VAC	690 VAC	690 VAC
Input Phase	3 Phase	3 Phase	3 Phase	3 Phase	3 Phase
AFE	Yes	Yes	Yes	Yes	Yes
Regenerative	Yes	Yes	Yes	Yes	Yes
Low Harmonic	Yes	Yes	Yes	Yes	Yes
Cooling	Air	Air	Air	Air	Air
Enclosure	IP21 / Type 1	IP21 / Type 1	IP21 / Type 1	IP21 / Type 1	IP21 / Type 1
Installation	Floor	Floor	Floor	Floor	Floor
LD Power	~426 kW	~580 kW	~842 kW	~647 kW	~467 kW*
ND Power	~380 kW	~518 kW	~754 kW	~572 kW	~405 kW*
HD Power	~339 kW	~426 kW	~667 kW	~479 kW	~336 kW*
Main Application	Industrial drive	Industrial drive	Higher-power drive	Higher-power drive	Industrial drive

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15. Five Related Popular Models from the Same Brand

The following models represent different product families within the same brand portfolio.

They are not direct replacements for the 20J1F3F505LNDNNNNN. Instead, they are useful alternatives when the application requires a different power level, physical format or drive architecture.

Model	Product Family	Product Type	Typical Voltage	Approx. Power Class	Cooling	Approx. Dimensions	Approx. Weight
25B-D017N114	PowerFlex 525	Compact AC Drive	380–480 VAC	Approx. 7.5 kW class	Air	Approx. 185 × 72 × 152 mm	Approx. 1.7 kg
20F11NC022JA0NNNNN	PowerFlex 753	Industrial AC Drive	380–480 VAC	Approx. 11–15 kW class	Air	Configuration dependent	Approx. 20–40 kg
20F11NC034JA0NNNNN	PowerFlex 753	Industrial AC Drive	380–480 VAC	Approx. 22–30 kW class	Air	Configuration dependent	Approx. 30–60 kg
20G1ANB140JA0NNNNN	PowerFlex 755	High-Power AC Drive	400–480 VAC	High-power class	Air	Large cabinet/chassis	Approx. 200–400 kg
20G1ANC350JA0NNNNN	PowerFlex 755	High-Power AC Drive	400–480 VAC	High-power class	Air	Large cabinet/chassis	Approx. 300–500 kg

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16. Broader Product Comparison

Parameter	25B-D017N114	20F11NC022JA0NNNNN	20F11NC034JA0NNNNN	20G1ANB140JA0NNNNN	20G1ANC350JA0NNNNN
Product Type	Compact AC Drive	Industrial AC Drive	Industrial AC Drive	High-Power AC Drive	High-Power AC Drive
Typical Voltage	380–480 V	380–480 V	380–480 V	400–480 V	400–480 V
Power Range	Small	Medium	Medium	High	High
Cooling	Air	Air	Air	Air	Air
Mounting	Compact	Cabinet/chassis	Cabinet/chassis	Industrial cabinet	Industrial cabinet
Regenerative Architecture	Not equivalent	Application dependent	Application dependent	Application dependent	Application dependent
Approx. Weight	~1.7 kg	~20–40 kg	~30–60 kg	~200–400 kg	~300–500 kg
Typical Application	Machine automation	Industrial machinery	Industrial machinery	Heavy industrial equipment	Heavy industrial equipment

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17. Typical Applications by Product Size

Application	Recommended Product Class
Small machine motor	PowerFlex 525 class
General industrial motor	PowerFlex 753 class
High-power individual motor	PowerFlex 755 class
Multi-drive industrial machine	PowerFlex 755T / 755TM
Regenerative multi-drive system	PowerFlex 755TM AFE
690 V industrial system	20J1 690 V configuration
Several hundred kW	20J1 bus supply
Multi-hundred-kW regenerative system	20J1 AFE bus supply
Multi-megawatt system	Larger PowerFlex 755TM configurations

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18. Why a Common DC Bus Is Useful

A common DC-bus system can be particularly useful in machinery containing multiple motors.

Consider a machine containing four motors.

Motor A may be accelerating.

Motor B may be operating at constant speed.

Motor C may be decelerating.

Motor D may be lifting a load.

These motors do not necessarily consume or generate energy at the same time.

A common DC-bus architecture provides a shared electrical energy path.

This means the system can be designed to coordinate the energy produced and consumed by different drive sections.

For complex machines, this can provide a cleaner overall power architecture.

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19. Regenerative Applications

The 20J1F3F505LNDNNNNN is particularly attractive where regenerative energy is a significant part of the machine’s operating cycle.

Typical examples include:

Cranes

Lowering a heavy load can produce substantial regenerative energy.

Hoists

Repeated lifting and lowering cycles can produce frequent energy reversal.

Conveyors

Large descending loads and deceleration can produce regeneration.

Test stands

Repeated acceleration and braking cycles can create substantial recoverable energy.

High-inertia machinery

Large rotating masses can return considerable energy during deceleration.

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20. Electrical Advantages

The 690 VAC input and high-current design provide a suitable electrical architecture for larger industrial systems.

At high power, the electrical current becomes one of the main engineering constraints.

For example, increasing the operating voltage allows the same amount of power to be transferred at a lower current.

This affects:

• Cable selection
• Busbar dimensions
• Switchgear
• Transformer design
• Thermal performance
• Electrical losses
• Cabinet size

This is one reason high-voltage industrial drive systems are commonly used for large motors.

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21. Mechanical Advantages

The floor-mounted construction provides a robust arrangement for large industrial installations.

The cabinet can be integrated into a dedicated electrical room or drive room.

The major mechanical considerations are:

• Floor loading
• Cabinet clearance
• Front access
• Cooling-air circulation
• Cable entry
• Maintenance space
• Transportation access
• Lifting equipment

The approximate 700–1,000 kg equipment weight means that mechanical handling should be planned before delivery.

The actual shipping weight should be confirmed for the complete configuration.

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22. Control and Operator Interface

The specified configuration includes a door-mounted HIM.

This provides an operator interface at the cabinet door rather than requiring normal operation to take place inside the cabinet.

The control architecture is associated with the TotalFORCE platform.

This type of control system is designed for advanced industrial drive applications and provides a platform for configuration, monitoring, diagnostics and drive-system management.

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23. Maintenance Considerations

Because the unit is an air-cooled high-power electrical system, regular inspection should include the cooling system and power connections.

Recommended inspection areas include:

• Cooling fans
• Air passages
• Cabinet ventilation
• Power connections
• Busbar connections
• Grounding connections
• Control electronics
• Power semiconductor assemblies
• Signs of overheating
• Cabinet contamination
• Mechanical connections

Dust accumulation can restrict airflow and increase the operating temperature of power electronics.

A clean electrical environment is therefore important for long-term operation.

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24. Installation Considerations

The following items should be considered when installing the 20J1F3F505LNDNNNNN:

Installation Item	Consideration
Incoming voltage	690 VAC three-phase
Power capacity	Must support required duty rating
Transformer	Adequately sized for system load
Protection	Proper upstream protection required
Grounding	Industrial grounding system required
Cable	Sized for actual current and installation method
Ventilation	Required for air-cooled operation
Floor	Must support cabinet weight
Clearance	Adequate service clearance required
Lifting	Heavy-equipment handling required
Environment	Clean, controlled industrial environment preferred
Maintenance	Front access and service area required

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25. Product Strengths at a Glance

The principal strengths of 20J1F3F505LNDNNNNN can be summarized as follows:

• 690 VAC three-phase operation
• Up to approximately 580 kW LD capacity
• Approximately 518 kW ND capacity
• Approximately 426 kW HD capacity
• 580 A LD current
• 518 A ND current
• 426 A HD current
• Active Front End
• Regenerative operation
• Low-harmonic architecture
• Common DC-bus capability
• Air cooling
• Type 1 / IP21 enclosure
• Floor-mounted construction
• Frame 8
• Door-mounted HIM
• TotalFORCE control architecture
• Suitable for multi-drive systems
• Suitable for demanding industrial machinery

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26. Final Technical Specification

Category	20J1F3F505LNDNNNNN
Brand	Allen-Bradley
Product Family	PowerFlex 755T
Product Series	PowerFlex 755TM
Product Category	PowerFlex 750 Bus Supplies
Product Type	AFE Regenerative Bus Supply
Input	690 VAC
Phase	3 Phase
LD Rating	580 kW / 580 A
ND Rating	518 kW / 518 A
HD Rating	426 kW / 426 A
Dynamic Braking	None
AFE	Yes
Regenerative	Yes
Low Harmonic	Yes
Cooling	Air Cooled
Enclosure	Type 1 / IP21
Mounting	Floor Mounted
Frame	8
EMI	Standard EMI Protection
HIM	Door Mounted
HIM Model	20-750-C6S
Control	TotalFORCE
Common DC Bus	Yes
Approx. Width	1,000–1,500 mm class
Approx. Depth	700–1,000 mm class
Approx. Height	2,000–2,400 mm class
Approx. Weight	700–1,000 kg
Weight Unit	kg
Main Application	High-power industrial drive systems
Typical Industries	Mining, material handling, cranes, hoists, metal processing, conveyors and high-inertia machinery

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27. Overall Product Summary

The 20J1F3F505LNDNNNNN is a high-power PowerFlex 755TM AFE regenerative bus supply designed for industrial systems requiring centralized DC-bus power and controlled regenerative operation.

Its 690 VAC three-phase input, 580 A LD rating, 518 A ND rating and 426 A HD rating place it in the several-hundred-kilowatt industrial power category.

The product’s main technical advantages are its Active Front End architecture, regenerative energy capability, low-harmonic design, common DC-bus structure, air cooling and industrial floor-mounted construction.

It is particularly well suited to machinery in which multiple motors operate together or where significant amounts of energy are generated during braking.

Typical applications include large conveyors, cranes, hoists, mining machinery, material-handling equipment, metal-processing machinery, high-inertia machines and industrial test systems.

For applications where the required power is lower, related 20J1 configurations can provide a more suitable capacity. For higher-power systems, larger 20J1 configurations within the same PowerFlex 755TM platform can be considered.

For applications that do not require a common DC bus or regenerative AFE architecture, smaller members of the PowerFlex family can provide a more compact solution.

The 20J1F3F505LNDNNNNN is therefore best understood as a high-capacity industrial power-conversion component for sophisticated multi-drive systems, rather than as a conventional standalone variable-frequency motor drive.

When selecting this product for replacement or a new machine design, the most important factors are the 690 VAC supply, required current, LD/ND/HD duty, regenerative requirements, number of connected inverter sections, common DC-bus architecture, enclosure requirements, cooling conditions, physical cabinet space and actual installation weight.