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Allen-Bradley 20G14TD485AN0NNNNN PowerFlex 755 AC Drive — Detailed Product Specifications, Applications, Advantages and Model Comparison

1. Product Introduction

The Allen-Bradley 20G14TD485AN0NNNNN is a high-power PowerFlex 755 AC drive designed for demanding industrial motor-control applications.

It belongs to the PowerFlex 755 series and is part of the larger PowerFlex 750-Series product family.

This particular configuration is designed around the 480 VAC, three-phase industrial voltage class and uses a DC input with precharge. It is a large-frame drive intended for applications where conventional compact variable-frequency drives are not suitable because of motor size, current requirements, mechanical load, or system architecture.

The model provides approximately 485 A of Light Duty output capacity, with ratings of approximately 450 HP Light Duty, 400 HP Normal Duty, and 350 HP Heavy Duty.

This places the 20G14TD485AN0NNNNN in the high-power industrial drive category.

It is especially suitable for large pumps, industrial fans, conveyors, compressors, mining equipment, cement and aggregate machinery, material-handling systems, process machinery, and other large rotating equipment.

The drive uses Frame 8 construction and forced-air cooling. Its open-type construction means that it is normally incorporated into a properly engineered electrical cabinet, drive lineup, or industrial control system rather than being installed like a small standalone wall-mounted drive.

The configuration also includes an EMC filter, while the AN configuration uses the corresponding common-mode capacitor jumper arrangement with the jumper removed.

The model is supplied with no HIM, meaning that a local Human Interface Module is not included in this catalog configuration.

The drive is also configured without the specified internal dynamic-braking option.

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2. Brand and Product Series

Item	Description
Brand	Allen-Bradley
Product Family	PowerFlex
Product Series	PowerFlex 755
Product Group	PowerFlex 750-Series
Model / Part Number	20G14TD485AN0NNNNN
Product Type	High-Power AC Drive
Drive Construction	Open Type
Frame	Frame 8
Voltage Class	480 VAC
Phase	Three-Phase
DC Voltage Class	650 VDC
Input Configuration	DC Input with Precharge
Cooling	Forced Air
Filtering	EMC Filter
CM Jumper	Removed
Dynamic Braking	None
HIM	Blank / No HIM
Communication	Embedded EtherNet/IP
Main Application	Large Industrial Motor Control

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3. Product Series Overview

The PowerFlex 755 series is designed for high-performance industrial motor control.

Unlike smaller general-purpose drives, the PowerFlex 755 platform is intended for large and technically demanding applications where the drive may need to interact with PLCs, HMIs, industrial networks, feedback devices, safety equipment, and other automation components.

The series is commonly considered when an industrial machine requires more than basic speed adjustment.

Typical requirements include:

• Adjustable motor speed
• Controlled acceleration
• Controlled deceleration
• High motor current
• High overload capability
• Networked control
• Diagnostic monitoring
• Multi-drive coordination
• Common DC-bus architecture
• Large industrial motors
• Centralized automation

The 20G14TD485AN0NNNNN represents a Frame 8, 480 VAC, high-current configuration within this platform.

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4. Complete Technical Parameter Table

Parameter	Specification
Model / Part Number	20G14TD485AN0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product Family	PowerFlex 750-Series
Drive Type	Air-Cooled AC Drive
Voltage Class	480 VAC
Input Phase	Three-Phase
DC Voltage Class	650 VDC
Applicable DC Input Range	Approximately 585–715 VDC
Input Type	DC Input with Precharge
Light Duty Current	485 A
Light Duty Power	450 HP
Normal Duty Current	414 A
Normal Duty Power	400 HP
Heavy Duty Current	350 A class
Heavy Duty Power	350 HP
Frame	Frame 8
Enclosure	Open Type
Cooling	Forced Air
Filtering	EMC Filter
CM Jumper	Removed
Dynamic Braking	None
Internal Braking Transistor	None
HIM	Blank / No HIM
Network	Embedded EtherNet/IP
Common DC-Bus Capability	Yes
Approx. Height	2145 mm
Approx. Width	778 mm
Approx. Depth	421 mm
Approx. Weight	162 kg
Installation	Industrial Cabinet / Drive Lineup
Typical Motor Application	Large Industrial Motors
Duty Classification	LD / ND / HD

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5. Electrical Rating

The main electrical characteristic of the 20G14TD485AN0NNNNN is its 485 A Light Duty current rating.

The corresponding Normal Duty rating is approximately 414 A, while the Heavy Duty rating is approximately 350 A.

The power ratings are approximately:

• 450 HP Light Duty
• 400 HP Normal Duty
• 350 HP Heavy Duty

This range makes the drive suitable for large industrial motors.

The distinction between Light Duty, Normal Duty, and Heavy Duty is important because different machines place different demands on the drive.

A centrifugal fan or pump with relatively smooth loading may have very different current requirements from a conveyor that starts under a heavily loaded belt.

For this reason, the drive should always be selected using the actual motor nameplate current and application duty.

Duty Rating	Current	Power
Light Duty	485 A	450 HP
Normal Duty	414 A	400 HP
Heavy Duty	Approx. 350 A class	350 HP

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6. 450 HP Light Duty Rating

The 450 HP Light Duty rating represents the upper power capability of this configuration under the applicable Light Duty conditions.

Light Duty applications generally have less severe overload requirements than Heavy Duty applications.

Typical examples can include large centrifugal pumps and fans where the load characteristic is relatively smooth.

However, the classification should never be chosen simply because the motor is labeled with a particular horsepower.

The motor’s actual full-load current and the application’s operating cycle should be checked before selecting the duty category.

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7. 400 HP Normal Duty Rating

The 400 HP Normal Duty rating is one of the most important specifications for this model.

For many industrial applications, the Normal Duty rating is the practical starting point for selecting a large drive.

Applications can include:

• Large pumps
• Industrial fans
• Process blowers
• Conveyors
• Material-handling systems
• Compressors
• Large process motors

The approximately 414 A Normal Duty current rating should be compared directly against the motor nameplate current.

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8. 350 HP Heavy Duty Rating

The Heavy Duty rating is approximately 350 HP.

Heavy Duty applications generally involve more demanding acceleration, overload, or torque requirements.

Typical examples may include:

• Loaded conveyors
• Crushers
• Material-handling equipment
• High-inertia machinery
• Machines with frequent acceleration
• Machines requiring greater torque during starting

When the machine requires a Heavy Duty rating, the motor current should be compared against the Heavy Duty drive rating rather than the higher Light Duty rating.

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9. 480 VAC Three-Phase Operation

The 20G14TD485AN0NNNNN is a 480 VAC three-phase drive.

480 VAC three-phase distribution is widely used in industrial plants.

Typical installations include:

• Manufacturing plants
• Processing facilities
• Water plants
• Mining operations
• Cement plants
• Steel plants
• Material-handling facilities
• Industrial HVAC systems

The 480 VAC configuration is especially useful for large industrial motor systems where three-phase motors operate at the corresponding voltage class.

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10. 650 VDC Class

The model belongs to the approximately 650 VDC input class.

The applicable DC input range is approximately 585–715 VDC.

This makes the drive suitable for engineered DC-bus systems where the incoming DC voltage is maintained within the appropriate operating range.

The DC voltage should not be confused with the motor output voltage.

The drive’s internal power electronics use the DC bus as part of the motor-control process, while the motor receives a controlled variable-frequency output waveform.

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11. DC Input with Precharge

The 20G14TD485AN0NNNNN is configured for DC Input with Precharge.

This configuration is particularly useful in applications where the drive is connected to a DC power architecture.

Large drives contain substantial DC-link capacitance.

When the system is initially energized, those capacitors must be charged in a controlled manner.

The precharge function helps manage the initial charging current before the DC bus reaches its normal operating state.

This is particularly important in high-power systems because uncontrolled capacitor charging could result in very high inrush current.

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12. Common DC-Bus Applications

The DC-input configuration makes the 20G14TD485AN0NNNNN well suited to common-DC-bus architectures.

A common DC bus can allow multiple drives to share a common electrical DC source.

This can be particularly useful when multiple motors operate as part of one machine.

Examples include:

• Multi-motor conveyors
• Rolling systems
• Cranes
• Hoists
• Material-handling machinery
• Large process lines
• Multi-drive production systems
• Test systems

In certain applications, regenerative energy from one drive can potentially be transferred through the common DC bus to another part of the system.

This can improve the overall energy-management strategy of a multi-drive installation.

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13. AN Configuration

The AN section of the catalog number identifies an important configuration detail.

For the filtering/common-mode capacitor arrangement, the A configuration corresponds to the common-mode capacitor jumper being removed.

Therefore, the 20G14TD485AN0NNNNN should not be treated as electrically identical to the corresponding JN version in terms of this configuration.

Configuration Item	Specification
Model / Part Number	20G14TD485AN0NNNNN
Filtering	EMC Filter
CM Jumper	Removed
Dynamic Braking	None
HIM	Blank / No HIM
Cooling	Forced Air
Frame	8

This can be important in installations where grounding, leakage current, EMC, and system architecture have been carefully engineered.

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14. EMC Filter

The model is supplied with an EMC filter configuration.

The filter helps address high-frequency electrical noise associated with variable-frequency drive switching.

However, good EMC performance depends on the complete installation.

Important factors include:

• Motor cable selection
• Motor cable shielding
• Grounding
• Cabinet bonding
• Cable routing
• Separation of control and power wiring
• Network cable routing
• Cabinet construction
• Proper termination

The EMC filter should therefore be considered one part of the overall EMC strategy.

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15. Dynamic Braking

The 20G14TD485AN0NNNNN is specified with no dynamic-braking option.

There is no specified internal braking transistor in this configuration.

This becomes particularly important when the drive controls high-inertia machinery.

During deceleration, the motor can return energy to the drive’s DC bus.

If the machine must stop rapidly, the system designer must determine how that energy will be handled.

Possible strategies include:

• Longer deceleration time
• Regenerative equipment
• External braking equipment
• Mechanical braking
• Controlled stopping
• Alternative energy-management architecture

The appropriate solution depends on motor speed, inertia, stopping time, and machine operating cycle.

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16. HIM Configuration

The model is supplied as Blank / No HIM.

A local Human Interface Module is therefore not part of this catalog configuration.

Parameter	Specification
Model / Part Number	20G14TD485AN0NNNNN
HIM	Blank / No HIM
Local Keypad	Not included
Local Display	Not included
Network Control	Supported
Centralized HMI Control	Suitable
PLC Integration	Suitable

This arrangement is particularly useful in large automated plants where operators normally control the machine from a central HMI or control station.

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17. Embedded EtherNet/IP

The PowerFlex 755 architecture supports embedded EtherNet/IP.

This allows the drive to become part of the industrial automation network.

Typical data exchanged with a control system can include:

• Start command
• Stop command
• Speed reference
• Direction
• Drive status
• Motor speed
• Current
• Fault status
• Alarm information
• Diagnostic information

This can greatly reduce the amount of hardwired control wiring required in large drive systems.

It also provides a convenient way for operators and maintenance personnel to monitor the drive from a central control system.

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18. Mechanical Specifications

The 20G14TD485AN0NNNNN uses Frame 8 open-type construction.

The approximate dimensions for the large Frame 8 open-drive configuration are:

2145 mm high × 778 mm wide × 421 mm deep

The approximate weight is:

162 kg

Mechanical Parameter	Specification
Model / Part Number	20G14TD485AN0NNNNN
Frame	Frame 8
Construction	Open Type
Height	Approx. 2145 mm
Width	Approx. 778 mm
Depth	Approx. 421 mm
Weight	Approx. 162 kg
Cooling	Forced Air
Mounting	Industrial Cabinet / Drive Lineup
Installation	Vertical industrial installation
Handling	Suitable mechanical lifting equipment recommended

These dimensions refer to the drive configuration and should not be confused with the dimensions of a complete MCC cabinet or packaged drive enclosure.

The final installation will normally require additional space for electrical connections, cable routing, ventilation, protective equipment, and maintenance access.

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19. Weight and Handling

A weight of approximately 162 kg makes this a substantial industrial component.

Proper handling equipment should be considered during installation.

The engineering team should plan:

• Lifting points
• Cabinet support
• Mounting structure
• Floor loading
• Cable weight
• Bus-bar support
• Removal path
• Service access

The installation method should be decided before cabinet fabrication.

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20. Cooling System

The drive uses forced-air cooling.

At this power level, thermal management is a major part of the installation.

The drive’s power semiconductors and associated electrical components generate heat during normal operation.

The cooling system moves air through the drive to remove this heat.

The cabinet therefore needs an appropriate airflow path.

Important factors include:

• Cooling-air temperature
• Air inlet
• Air outlet
• Fan condition
• Airflow volume
• Dust accumulation
• Cabinet ventilation
• Internal cabinet temperature

When several large drives are installed in the same electrical room, the combined heat output should also be considered.

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21. Environmental Considerations

The drive is intended for industrial applications, but the installation environment still matters.

Environmental Factor	Design Consideration
Ambient Temperature	Maintain within applicable drive limits
Humidity	Avoid condensation
Dust	Protect cooling passages
Oil Mist	Avoid excessive contamination
Corrosive Gas	Evaluate before installation
Vibration	Consider nearby machinery
Altitude	Check applicable derating
Cooling Air	Keep unobstructed
Cabinet Temperature	Maintain within limits
Contamination	Provide suitable environmental protection

Open-type construction means the surrounding enclosure and environment should be properly engineered.

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22. Application: Large Pumps

The 20G14TD485AN0NNNNN is a strong candidate for large pump applications.

Typical applications include:

• Water-treatment pumps
• Cooling-water pumps
• Industrial process pumps
• Circulation pumps
• Irrigation systems
• Mining slurry systems
• Large utility pumps
• Process-fluid pumps

Variable-speed control allows the pump motor to operate according to actual process requirements.

For suitable centrifugal-pump systems, reducing motor speed can significantly reduce the power required to produce lower flow rates.

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23. Application: Large Fans

Large industrial fans and blowers are another suitable application.

Examples include:

• Furnace fans
• Exhaust fans
• Dust-collection fans
• Industrial ventilation
• Mining ventilation
• Cement-plant fans
• Steel-process fans
• Large process blowers

Variable-speed control can allow the fan to match airflow to the actual production requirement.

This can also reduce unnecessary energy consumption during periods of lower demand.

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24. Application: Conveyors

The drive can be used for large conveyor systems.

Potential applications include:

• Mining conveyors
• Aggregate conveyors
• Cement conveyors
• Port conveyors
• Bulk-material conveyors
• Long belt conveyors
• Heavy-duty production conveyors

Conveyors can have substantial starting torque requirements.

The drive should therefore be selected according to the motor current, load condition, acceleration time, and duty classification.

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25. Application: Mining

Mining equipment often requires large motors operating under demanding conditions.

Potential applications include:

• Ore conveyors
• Crushers
• Pumps
• Ventilation systems
• Material handling
• Processing machinery
• Bulk-material transport

The high current capacity of the 20G14TD485AN0NNNNN makes it appropriate for many large mining motors.

Dust control and cabinet cooling are particularly important in these installations.

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26. Application: Cement and Aggregate

Cement and aggregate plants contain many large motors.

Typical applications include:

• Conveyors
• Process fans
• Crushers
• Pumps
• Dust collectors
• Material-handling systems
• Process machinery

The drive can provide adjustable speed and controlled acceleration while integrating the motor into a larger automation system.

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27. Application: Steel and Metal Processing

Large steel-processing facilities often require high-power motor control.

Potential applications include:

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

In these applications, torque requirements, inertia, acceleration, and deceleration should be carefully evaluated.

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28. Application: Paper and Pulp

Paper and pulp production often involves multiple motors operating as part of a coordinated process.

The PowerFlex 755 platform can be used for:

• Fans
• Pumps
• Conveyors
• Roll-related equipment
• Process machinery
• Material handling

Network integration can be particularly useful because the drive can exchange operating information with the central machine-control system.

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29. Application: Compressors

Large compressors can also require high-power variable-speed control.

Possible applications include:

• Industrial compressors
• Process compressors
• Utility compressors
• Large air systems
• Gas-processing equipment

The compressor’s actual torque-speed curve should be reviewed before final drive selection.

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30. Application: Material Handling

Large material-handling systems can benefit from controlled motor acceleration and speed regulation.

Examples include:

• Cranes
• Hoists
• Transfer systems
• Large conveyors
• Bulk-material systems
• Industrial lifting systems

High-inertia and regenerative conditions should be evaluated carefully because this configuration does not include the specified internal dynamic-braking transistor.

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31. Main Product Advantages

High Current Capacity

The 485 A Light Duty rating gives the drive substantial current capacity.

This makes it suitable for large industrial motors.

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450 HP Light Duty Capacity

The approximately 450 HP Light Duty rating provides a high-power solution for applications with suitable load characteristics.

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400 HP Normal Duty Capacity

The approximately 400 HP Normal Duty rating makes this model particularly useful for large continuous-duty industrial machinery.

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350 HP Heavy Duty Capacity

The Heavy Duty rating provides additional capability for demanding applications where overload and torque requirements are greater.

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480 VAC Industrial Compatibility

The 480 VAC three-phase configuration fits a large number of industrial electrical systems.

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DC Input with Precharge

The DC-input architecture makes the model suitable for engineered common-DC-bus systems.

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Embedded EtherNet/IP

Network connectivity simplifies integration into centralized automation systems.

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PowerFlex 755 Platform

The PowerFlex 755 architecture provides a broad range of control and integration capabilities for demanding industrial equipment.

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Forced-Air Cooling

Forced-air cooling is appropriate for a high-power Frame 8 drive when the cabinet and surrounding system are correctly designed.

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EMC Filter

The EMC-filtered configuration can support applications where electrical noise and system compatibility are important considerations.

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32. Advantages for System Integrators

For system integrators, one major benefit is platform standardization.

A plant can use different PowerFlex 755 ratings for different motors while maintaining a familiar overall drive architecture.

This can simplify:

• PLC programming
• Network configuration
• HMI development
• Parameter management
• Commissioning
• Troubleshooting
• Maintenance
• Technical documentation

The DC-input configuration also provides flexibility for engineered common-bus systems.

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33. Advantages for OEM Machine Builders

For OEM machine builders, the PowerFlex 755 platform can simplify the development of large machines.

The same general drive family can cover different motor sizes.

This allows OEMs to standardize:

• Drive configuration
• Software templates
• HMI screens
• Network communication
• Troubleshooting procedures
• Electrical documentation
• Spare-parts strategy

The 20G14TD485AN0NNNNN can serve as the high-power drive in a larger machine platform.

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34. Advantages for Plant Operators

Operators can benefit from centralized drive monitoring.

Depending on the overall control system, they can monitor:

• Motor speed
• Drive status
• Current
• Faults
• Alarms
• Commands
• Process references

This can reduce the need to physically access the drive during normal operation.

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35. Advantages for Maintenance Personnel

Networked diagnostics can make troubleshooting more efficient.

Technicians may be able to determine whether an issue is associated with:

• Motor current
• Drive status
• Overload
• Acceleration
• Temperature
• Communication
• External interlocks
• Fault conditions

For large industrial plants, faster fault identification can directly reduce production downtime.

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36. Five Recommended Models from the Same Series

The following models are closely related and are useful when selecting around the 485 A configuration.

Model / Part Number	Voltage	Light Duty	Normal Duty	Heavy Duty	Frame	Input Type
20G14TD430AN0NNNNN	480 VAC	400 HP	350 HP	300 HP	8	DC Input with Precharge
20G14TD485JN0NNNNN	480 VAC	450 HP	400 HP	350 HP	8	DC Input with Precharge
20G14TD545AN0NNNNN	480 VAC	500 HP	450 HP	400 HP	8	DC Input with Precharge
20G14TD617AN0NNNNN	480 VAC	600 HP	500 HP	450 HP	8	DC Input with Precharge
20G14TD710AN0NNNNN	480 VAC	650 HP	600 HP	500 HP	8	DC Input with Precharge

The 485 A model sits between the 430 A and 545 A configurations in this group.

This makes it a useful choice when a 350 HP-class drive is too small but the 450 HP-class configuration is not yet required.

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37. Same-Series Model Comparison

Model / Part Number	Voltage	LD Power	ND Power	HD Power	Frame	Approx. Dimensions	Weight
20G14TD430AN0NNNNN	480 VAC	400 HP	350 HP	300 HP	8	Approx. 2145 × 778 × 421 mm	Approx. 162 kg
20G14TD485AN0NNNNN	480 VAC	450 HP	400 HP	350 HP	8	Approx. 2145 × 778 × 421 mm	Approx. 162 kg
20G14TD545AN0NNNNN	480 VAC	500 HP	450 HP	400 HP	8	Configuration dependent	Configuration dependent
20G14TD617AN0NNNNN	480 VAC	600 HP	500 HP	450 HP	8	Configuration dependent	Configuration dependent
20G14TD710AN0NNNNN	480 VAC	650 HP	600 HP	500 HP	8	Configuration dependent	Configuration dependent

The first two configurations share the same general Frame 8 mechanical platform.

For the other configurations, exact dimensions and weight should be checked against the specific mechanical drawing before cabinet fabrication.

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38. Five Related Higher-Voltage PowerFlex 755 Models

For projects using approximately 690 VAC industrial systems, the following models are useful related products.

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

These are not direct replacements for the 20G14TD485AN0NNNNN because they use a different voltage class.

They are useful when comparing PowerFlex 755 solutions across different industrial power systems.

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39. Five Popular Allen-Bradley Models

The following models are useful as broader same-brand comparisons.

Model / Part Number	Series	Voltage Class	Current Class	Approx. Power Class	Typical Application	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	Industrial machinery	Configuration dependent	Configuration dependent
25B-D030N114	PowerFlex 525	480 VAC	30 A	Approx. 15 kW class	Pumps, fans, machine drives	Configuration dependent	Configuration dependent
20G11NC5P0JA0NNNNN	PowerFlex 755	480 VAC	50 A class	Approx. 37–45 kW class	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 considerably smaller than the 20G14TD485AN0NNNNN.

They are useful as reference points when choosing the appropriate drive size for smaller motors.

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40. 430 A vs. 485 A vs. 545 A

The closest practical comparison is between the 430 A, 485 A, and 545 A configurations.

Model / Part Number	Light Duty	Normal Duty	Heavy Duty	General Position
20G14TD430AN0NNNNN	400 HP	350 HP	300 HP	Lower
20G14TD485AN0NNNNN	450 HP	400 HP	350 HP	Medium-high
20G14TD545AN0NNNNN	500 HP	450 HP	400 HP	Higher
20G14TD617AN0NNNNN	600 HP	500 HP	450 HP	Very high
20G14TD710AN0NNNNN	650 HP	600 HP	500 HP	Extremely high

The 485 A model is therefore a useful middle selection when a 430 A configuration does not provide enough capacity.

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41. Model Selection by Application

Application	Recommended Model Range	Main Consideration
Medium-large pump	20G14TD430AN0NNNNN	350 HP ND class
Large pump	20G14TD485AN0NNNNN	400 HP ND class
Large industrial fan	20G14TD485AN0NNNNN	400 HP ND class
Heavy conveyor	20G14TD485AN0NNNNN	Torque and acceleration
Larger conveyor	20G14TD545AN0NNNNN	Higher current
Large process machinery	20G14TD545AN0NNNNN	450 HP ND class
Very large machinery	20G14TD617AN0NNNNN	500 HP ND class
Extremely large drive system	20G14TD710AN0NNNNN	600 HP ND class

Actual selection should always be based on motor current and duty requirements.

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42. Motor Selection

Motor selection should begin with the motor nameplate.

Important information includes:

• Rated voltage
• Rated current
• Rated horsepower
• Rated frequency
• Rated speed
• Power factor
• Efficiency
• Motor type
• Starting torque
• Maximum speed
• Operating speed
• Load inertia
• Feedback requirements

The most important electrical comparison is usually the motor’s rated current against the drive’s applicable duty rating.

A motor’s horsepower alone does not provide enough information to make a final drive selection.

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43. High-Inertia Loads

High-inertia applications deserve special attention.

Examples include:

• Large fans
• Large conveyors
• Centrifuges
• Flywheel machinery
• Rolling equipment
• Large rotating process equipment

During acceleration, the drive must provide sufficient torque to accelerate the rotating mass.

During deceleration, the motor can return energy to the DC bus.

Because the 20G14TD485AN0NNNNN does not have the specified internal dynamic-braking transistor, the stopping strategy should be reviewed carefully.

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44. Conveyor Selection

For a conveyor, the following information should be considered:

1. Motor current.
2. Motor horsepower.
3. Conveyor length.
4. Belt weight.
5. Material weight.
6. Starting load.
7. Acceleration time.
8. Deceleration time.
9. Motor inertia.
10. Belt inertia.
11. Number of motors.
12. Regenerative conditions.

The 20G14TD485AN0NNNNN can be a strong option when the motor and load fall within its current and duty range.

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45. Pump Selection

For pump applications, consider:

• Pump type
• Flow
• Pressure
• Motor current
• Motor horsepower
• Required speed range
• Minimum speed
• Maximum speed
• Operating cycle

Centrifugal pump systems are particularly suitable for variable-speed operation.

The drive can adjust motor speed according to the required process flow.

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46. Fan Selection

For industrial fans, the following factors should be evaluated:

• Fan type
• Airflow
• Static pressure
• Motor current
• Motor power
• Operating speed
• Minimum speed
• Maximum speed
• Acceleration requirements

Large fans can be good candidates for variable-frequency control because airflow requirements often change throughout the production process.

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47. Cabinet Design

The open-type Frame 8 construction means that cabinet design is an important part of the installation.

The cabinet should accommodate:

• Drive mounting
• DC connections
• Motor connections
• Grounding
• Network cables
• Control wiring
• Cooling airflow
• Protective devices
• Service access
• Cable bending radius

The approximately 2145 mm height should be considered at the beginning of the mechanical design.

The drive should not simply be added to an existing cabinet without checking the physical and thermal requirements.

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48. Thermal Management

A high-power drive can generate considerable heat.

The cabinet designer should consider the combined heat generated by:

• Drive electronics
• DC-bus equipment
• Fans
• Auxiliary power supplies
• Contactors
• Other drives
• Transformers

The cooling system must maintain an acceptable internal temperature.

This becomes even more important when multiple high-power drives are installed in one electrical room.

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49. EMC and Grounding

The EMC-filtered configuration provides an important part of the electrical noise-control strategy.

The installation should still use appropriate:

• Grounding
• Bonding
• Shielding
• Motor cable practices
• Cable routing
• Cabinet construction
• Network cable separation

The AN configuration with CM jumper removed should be considered when determining the grounding and EMC arrangement for the complete system.

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50. Maintenance Recommendations

Maintenance should focus on the complete drive system.

Recommended inspection areas include:

• Cooling fans
• Air passages
• Electrical terminals
• DC connections
• Motor connections
• Grounding
• Cabinet ventilation
• Dust accumulation
• Overheating signs
• Network connections
• Fault history
• Mechanical vibration

For continuous-process applications, preventive maintenance can be especially important because unexpected drive downtime can stop an entire production line.

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51. Spare Parts Planning

A high-power drive may be a critical part of a production system.

A plant using multiple PowerFlex 755 drives can benefit from standardized spare-parts planning.

Possible spare categories include:

• Cooling fans
• Control components
• Communication components
• I/O components
• Power components
• Protective devices
• Cabinet cooling components

The appropriate spare-parts level depends on the criticality of the machine and the cost of production downtime.

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52. Advantages in Energy Management

Variable-speed control can provide significant energy-management benefits in suitable applications.

This is particularly relevant to:

• Pumps
• Fans
• Blowers

When process demand is lower, the motor can operate at a reduced speed instead of continuously operating at maximum speed.

The actual energy savings depend on the machine, process, operating schedule, system resistance, motor efficiency, and control method.

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53. Advantages in Production Automation

The PowerFlex 755 architecture allows the drive to become part of a larger automation system.

For a production line, the drive can receive commands and speed references while sending status and diagnostic information back to the control system.

This can support:

• Centralized control
• Automatic speed adjustment
• Process synchronization
• Fault monitoring
• Production diagnostics
• Maintenance monitoring

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54. Advantages in System Standardization

Using related PowerFlex 755 models across a facility can make engineering and maintenance easier.

For example, a plant might use:

• 20G14TD430 for smaller large motors
• 20G14TD485 for 400 HP-class motors
• 20G14TD545 for larger motors
• 20G14TD617 for 500 HP-class applications
• 20G14TD710 for 600 HP-class applications

This creates a logical progression within one drive architecture.

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55. Important Selection Checklist

Before purchasing or installing the 20G14TD485AN0NNNNN, check the following:

Selection Item	What to Check
Motor Voltage	Compatible with 480 VAC-class system
Motor Current	Within applicable drive duty rating
Motor Power	Compare with LD / ND / HD rating
Duty	Determine LD, ND or HD requirement
DC Input	Confirm DC bus voltage
Precharge	Confirm system compatibility
Braking	Check deceleration energy
EMC	Verify AN/CM configuration
Cooling	Verify cabinet airflow
Dimensions	Confirm cabinet space
Weight	Confirm handling capability
Network	Confirm EtherNet/IP architecture
HIM	Confirm no local HIM is required
Environment	Verify temperature, humidity and contamination
Maintenance	Provide adequate service access

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56. Direct AN vs. JN Configuration Comparison

The corresponding AN and JN versions are worth comparing because the primary difference is related to the filtering/common-mode capacitor configuration.

Parameter	20G14TD485AN0NNNNN	20G14TD485JN0NNNNN
Voltage	480 VAC	480 VAC
Light Duty	450 HP	450 HP
Normal Duty	400 HP	400 HP
Heavy Duty	350 HP	350 HP
Frame	8	8
Input	DC Input with Precharge	DC Input with Precharge
Filtering	EMC Filter	EMC Filter
CM Jumper	Removed	Installed
Dynamic Braking	None	None
HIM	Blank / No HIM	Blank / No HIM
Cooling	Forced Air	Forced Air
Approx. Dimensions	2145 × 778 × 421 mm	2145 × 778 × 421 mm
Approx. Weight	162 kg	162 kg

The choice between these configurations should be based on the actual grounding, EMC, and system requirements.

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57. Why Choose 20G14TD485AN0NNNNN?

The 20G14TD485AN0NNNNN is particularly attractive when the application requires:

• 480 VAC three-phase operation
• Approximately 400 HP Normal Duty capacity
• Approximately 450 HP Light Duty capacity
• Approximately 350 HP Heavy Duty capacity
• Approximately 485 A Light Duty current
• DC input
• Precharge
• Common DC-bus architecture
• Embedded EtherNet/IP
• Frame 8 construction
• Forced-air cooling
• EMC filtering
• No local HIM
• No specified internal dynamic-braking transistor

It is especially appropriate for large industrial equipment where a smaller drive would not provide enough current capacity.

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58. Five Closely Related Models — Detailed Parameter Comparison

Model / Part Number	Voltage	LD Current	LD Power	ND Current	ND Power	HD Power	Frame
20G14TD430AN0NNNNN	480 VAC	430 A	400 HP	370 A	350 HP	300 HP	8
20G14TD485AN0NNNNN	480 VAC	485 A	450 HP	414 A	400 HP	350 HP	8
20G14TD545AN0NNNNN	480 VAC	545 A	500 HP	454 A	450 HP	400 HP	8
20G14TD617AN0NNNNN	480 VAC	617 A	600 HP	545 A	500 HP	450 HP	8
20G14TD710AN0NNNNN	480 VAC	710 A	650 HP	617 A	600 HP	500 HP	8

This table shows the position of the 485 A model clearly.

It is a step above the 430 A configuration and below the 545 A configuration.

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59. Five Popular Same-Brand Models — Detailed Parameter Comparison

Model / Part Number	Series	Voltage	Current	Power Class	Typical Application	Dimensions	Weight
25B-D017N114	PowerFlex 525	480 VAC	17 A class	Approx. 7.5 kW	Pumps / Fans / Conveyors	Configuration dependent	Configuration dependent
25B-D024N114	PowerFlex 525	480 VAC	24 A class	Approx. 11 kW	General Machinery	Configuration dependent	Configuration dependent
25B-D030N114	PowerFlex 525	480 VAC	30 A class	Approx. 15 kW	Industrial Machinery	Configuration dependent	Configuration dependent
20G11NC5P0JA0NNNNN	PowerFlex 755	480 VAC	50 A class	Approx. 37–45 kW	Process Equipment	Configuration dependent	Configuration dependent
20G11NC072JA0NNNNN	PowerFlex 755	480 VAC	72 A class	Approx. 55 kW	Pumps / Fans / Conveyors	Configuration dependent	Configuration dependent

These five models are not direct substitutes for the 20G14TD485AN0NNNNN.

They represent smaller and more general industrial drive applications.

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60. Product Positioning

The 20G14TD485AN0NNNNN sits toward the high-power end of the PowerFlex 755 platform.

It is substantially larger than compact drives used for small machine motors.

The approximately 400 HP Normal Duty capacity places it in applications where the motor itself is already a major piece of industrial equipment.

The model is therefore more appropriately viewed as part of a complete engineered drive system.

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61. Overall Advantages

The major advantages of the 20G14TD485AN0NNNNN can be summarized as follows:

Advantage	Description
High Power	Up to approximately 450 HP LD
High Current	485 A LD class
Normal Duty	Approximately 400 HP
Heavy Duty	Approximately 350 HP
Industrial Voltage	480 VAC three-phase
DC Architecture	DC input with precharge
Common Bus	Suitable for common-DC-bus systems
Networking	Embedded EtherNet/IP
Cooling	Forced air
EMC	Filtered configuration
Frame	Large Frame 8
Centralized Control	No-HIM configuration
Application Range	Pumps, fans, conveyors, compressors and process machinery

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62. Final Technical Specification Table

Category	Parameter	Specification
Identification	Model / Part Number	20G14TD485AN0NNNNN
Brand	Brand	Allen-Bradley
Product Family	Family	PowerFlex
Product Series	Series	PowerFlex 755
Product Group	Group	PowerFlex 750-Series
Product Type	Drive	Air-Cooled AC Drive
Voltage	Voltage Class	480 VAC
Phase	Phase	Three-Phase
DC Voltage	Voltage Class	650 VDC
DC Input	Approx. Input Range	585–715 VDC
Input	Input Type	DC Input with Precharge
Light Duty	Current	485 A
Light Duty	Power	450 HP
Normal Duty	Current	414 A
Normal Duty	Power	400 HP
Heavy Duty	Current	Approx. 350 A class
Heavy Duty	Power	350 HP
Frame	Frame Size	8
Construction	Enclosure	Open Type
Cooling	Cooling	Forced Air
Filtering	Filter	EMC Filter
CM Configuration	Jumper	Removed
Dynamic Braking	DB	None
Internal Braking Transistor	DB Transistor	None
HIM	Local Interface	Blank / No HIM
Communication	Network	Embedded EtherNet/IP
Architecture	DC Bus	Common DC Bus Compatible
Dimensions	Height	Approx. 2145 mm
Dimensions	Width	Approx. 778 mm
Dimensions	Depth	Approx. 421 mm
Weight	Approx. Weight	Approx. 162 kg
Installation	Mounting	Industrial Cabinet / Drive Lineup
Application	Motor Type	Large Industrial Motors
Applications	Typical Loads	Pumps, Fans, Conveyors, Compressors, Mining, Process Machinery
Duty	Rating Classes	LD / ND / HD

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63. Final Product Assessment

The Allen-Bradley 20G14TD485AN0NNNNN PowerFlex 755 is a high-capacity industrial AC drive intended for large motor applications.

Its 480 VAC three-phase electrical class, approximately 485 A Light Duty capacity, 400 HP Normal Duty rating, and 350 HP Heavy Duty rating make it suitable for a broad range of large industrial machines.

The model’s DC Input with Precharge configuration makes it particularly useful in engineered DC-bus and common-DC-bus systems.

Its embedded EtherNet/IP capability also makes it well suited to centralized industrial automation systems.

The EMC-filtered configuration provides an important part of the electrical noise-management architecture, while the AN configuration with the CM jumper removed should be considered carefully when designing the grounding and EMC arrangement.

The absence of the specified dynamic-braking transistor means that high-inertia applications and rapid stopping requirements should receive additional engineering attention.

Mechanically, this is a substantial piece of equipment. The approximate 2145 × 778 × 421 mm open-type Frame 8 dimensions and approximately 162 kg weight mean that cabinet construction, lifting, service access, cooling, and floor loading should be considered during the initial engineering stage.

The closest same-series alternatives provide a logical progression around this model. The 20G14TD430AN0NNNNN is a lower-capacity option, while the 20G14TD545AN0NNNNN, 20G14TD617AN0NNNNN, and 20G14TD710AN0NNNNN provide progressively greater current and horsepower capacity.

For a large industrial pump, fan, conveyor, compressor, mining machine, cement system, steel-processing system, or other high-power rotating machine, the 20G14TD485AN0NNNNN is best positioned as a high-power Frame 8 PowerFlex 755 drive for applications requiring approximately 400 HP Normal Duty capacity and a robust industrial automation interface.

The final selection should always be based on the actual motor nameplate current, duty classification, acceleration requirements, load inertia, braking requirements, DC-bus arrangement, environmental conditions, cabinet cooling, and installation dimensions.

In practical terms, this model is a good fit when the application has moved beyond ordinary machine-drive requirements and entered the range of large industrial motor control, engineered DC-bus systems, and high-power automated production equipment.