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Allen-Bradley 20G1G3D1K0LNDNNNNN — Detailed Technical Product Overview

1. Product Overview

The Allen-Bradley 20G1G3D1K0LNDNNNNN is a very high-power industrial AC drive belonging to the PowerFlex 755 family. It is designed for large three-phase motor applications where substantial current capacity, controlled acceleration and deceleration, advanced motor control, and integration with a larger industrial automation system are required.

This model belongs to the PowerFlex 755T generation of high-performance drives and uses an air-cooled packaged construction. The catalog number identifies a 480 V AC, three-phase configuration with a D1K0 normal-duty rating class.

The D1K0 rating is significantly larger than the C770 and C920 models used in many 400 V-class installations. At the 480 V level, the D1K0 class is associated with approximately 1,045 A normal-duty output current and 900 hp normal-duty capacity, with approximately 1,135 A and 1,000 hp in the light-duty category.

This places the product firmly in the large industrial-drive category.

It is intended for applications involving very large motors, such as major pumps, compressors, fans, blowers, conveyors, process equipment, material-handling machinery, mining equipment, and other heavy industrial systems.

The physical size is also substantial. This is not a compact machine-mounted inverter. It is a floor-mounted industrial drive that normally requires dedicated electrical-room space, suitable ventilation, proper floor support, lifting equipment, and adequate service clearance.

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2. Brand and Product Series

Item	Specification
Model	20G1G3D1K0LNDNNNNN
Brand	Allen-Bradley
Product family	PowerFlex
Product series	PowerFlex 755
Technology generation	PowerFlex 755T
Product type	High-power air-cooled AC drive
Drive configuration	Packaged industrial drive
Input voltage	480 V AC class
Input phase	3-phase
Normal-duty current	Approximately 1,045 A
Normal-duty power	Approximately 900 hp
Light-duty current	Approximately 1,135 A
Light-duty power	Approximately 1,000 hp
Frame	Frame 9 class
Cooling	Forced air
Mounting	Floor-mounted
Enclosure class	Type 1 / IP21 class
Control architecture	TotalFORCE-based PowerFlex 755 control
Typical application	Very large industrial AC motors

The D1K0 designation is particularly important because it identifies the high-current rating class.

The D voltage designation corresponds to the 480 V AC, three-phase version of the PowerFlex 755T rating structure.

The model therefore differs significantly from a 400 V C-series drive such as a C770 or C920.

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3. Main Technical Parameters

Parameter	Specification
Model	20G1G3D1K0LNDNNNNN
Brand	Allen-Bradley
Product family	PowerFlex
Series	PowerFlex 755
Technology	PowerFlex 755T / TotalFORCE
Product type	High-power air-cooled AC drive
Input voltage	480 V AC class
Input phase	3-phase
Input frequency	50/60 Hz class
Normal-duty current	Approximately 1,045 A
Normal-duty power	Approximately 900 hp
Light-duty current	Approximately 1,135 A
Light-duty power	Approximately 1,000 hp
Heavy-duty selection	Requires appropriate lower-rated catalog configuration; D1K0 is not the heavy-duty rating for this power class
Frame	Frame 9
Cooling	Forced air
Mounting	Floor-mounted
Enclosure	Type 1 / IP21 class
Input configuration	High-power industrial AC input
Control	TotalFORCE control architecture
Motor control	Variable-frequency and high-performance motor control
Feedback capability	Available through appropriate configuration
Communication	Network and communication options available
Operator interface	HIM options / configured operator interface
Harmonic solution	Dependent on exact 755T configuration and selected drive type
Approx. width	1100 mm class
Approx. depth	1400 mm class
Approx. height	2300 mm class
Approx. weight	Approximately 986 kg class
Weight in kg	Approx. 986 kg
Application category	Very large industrial motor control

The current rating is the key specification when matching this drive to a motor.

At approximately 1,045 A normal duty, this model is intended for motors substantially larger than those normally connected to compact variable-frequency drives.

The approximately 900 hp normal-duty rating places it around the 670 kW class when expressed as mechanical power equivalent.

For lighter-duty applications, the drive can reach approximately 1,000 hp in the corresponding light-duty rating class.

The actual motor selection should always be based on the motor nameplate current and the required duty rather than horsepower alone.

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4. Electrical Rating Details

The following table gives a practical view of the main rating categories.

Rating category	Approx. current	Approx. power	Typical use
20G1G3D1K0LNDNNNNN — Light duty	1,135 A	1,000 hp	Smooth loads with lower overload demand
20G1G3D1K0LNDNNNNN — Normal duty	1,045 A	900 hp	General large industrial loads
Heavy-duty category	Lower power/current catalog rating required	Approximately 750 hp class for this rating family	High-overload applications

The difference between light duty and normal duty is important.

A large pump or fan with a relatively smooth torque requirement may be able to use the higher light-duty rating.

A general industrial machine may be evaluated against the normal-duty rating.

A machine requiring repeated high overload current, frequent acceleration, or high starting torque may require a different heavy-duty-rated catalog configuration rather than simply assuming that the D1K0 model can provide the same power at heavy duty.

This is an important point when selecting a drive for a large motor.

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5. Physical Dimensions and Weight

The 20G1G3D1K0LNDNNNNN is a very large industrial drive.

Mechanical parameter	Approximate value
Model	20G1G3D1K0LNDNNNNN
Width	Approximately 1100 mm
Depth	Approximately 1400 mm
Height	Approximately 2300 mm
Approximate footprint	1100 × 1400 mm
Approximate weight	986 kg
Weight in kilograms	986 kg
Frame	Frame 9
Mounting	Floor-mounted
Cooling	Forced air
Enclosure	Type 1 / IP21 class
Installation environment	Industrial electrical room / equipment area

The dimensions above should be regarded as a practical reference for the large Frame 9 package.

The final physical arrangement can vary depending on the complete factory configuration.

Additional wiring compartments, disconnect equipment, input equipment, output equipment, braking arrangements, communication equipment, or other options can change the final footprint and weight.

The approximately 986 kg reference weight also means that the equipment should be handled as major electrical machinery.

A suitable lifting method should be arranged before installation.

Floor loading should also be checked.

The transportation route from unloading point to the final electrical-room position should be considered in advance, particularly when door openings, ramps, elevators, or restricted access routes are involved.

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6. Product Introduction

The PowerFlex 755 is a high-performance industrial AC drive platform designed for large and technically demanding motor applications.

The 20G1G3D1K0LNDNNNNN represents a much higher power level than compact drives intended for small machine motors.

The drive is designed to regulate the speed and torque of large three-phase motors while providing the control functions needed for integration into an industrial automation system.

A large motor can create significant electrical and mechanical stress during starting.

Direct-on-line starting can produce high inrush current and a sudden application of torque.

A variable-frequency drive provides a much more controlled starting process.

The motor can be accelerated according to a programmed ramp.

Speed can be changed during operation.

The motor can be decelerated in a controlled manner.

Operating information can be monitored.

Fault conditions can be detected and reported.

This makes the drive a central component in many large industrial machines.

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7. 480 V High-Power Configuration

The D1K0 configuration belongs to the 480 V AC, three-phase section of the PowerFlex 755T rating structure.

This is important when comparing it with other models.

For example, a C-series model such as C770 belongs to the 400 V class, while the D-series models are associated with the 480 V class.

The voltage difference changes the current required for a given power level.

For the same approximate motor power, a higher motor voltage generally means lower current.

That is one reason the D1K0 model can handle a very large motor-power range at a current level around 1,045 A rather than requiring an even larger current rating.

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8. TotalFORCE Control Architecture

The PowerFlex 755T platform uses a high-performance control architecture intended for demanding industrial applications.

The control system is designed to provide more than simple frequency adjustment.

Depending on the final configuration, the drive can support functions associated with:

• Speed control.
• Torque control.
• Motor feedback.
• Start and stop control.
• Acceleration and deceleration.
• Fault monitoring.
• Diagnostic information.
• Process control.
• Network communication.
• Drive parameter management.
• Motor protection functions.

This is particularly valuable for large machines where the motor is directly connected to an important production process.

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9. High-Performance Motor Control

Large motors often need more sophisticated control than simple open-loop frequency adjustment.

For example, a conveyor may require stable torque during acceleration.

A compressor may require controlled speed according to process demand.

A large pump may need its speed adjusted according to flow.

A large fan may need different speeds depending on ventilation requirements.

A material-handling system may require controlled acceleration and deceleration.

The PowerFlex 755 architecture is designed to provide the flexibility required for these applications.

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10. Main Advantages

10.1 Very High Current Capacity

The most obvious characteristic of this model is its approximately 1,045 A normal-duty output current.

This places it in a very different class from compact variable-frequency drives.

A drive with more than 1,000 A of output capacity is intended for large industrial motors and substantial mechanical loads.

This makes the model particularly relevant to major pumps, fans, compressors, conveyors, and process machinery.

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10.2 Approximately 900 hp Normal-Duty Capability

The normal-duty rating is approximately 900 hp.

This corresponds to a motor-power range around the high hundreds of kilowatts.

For large industrial systems, this level of capacity can allow one drive to control a very large motor without requiring multiple smaller drives.

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10.3 Up to Approximately 1,000 hp Light-Duty Class

The light-duty rating reaches approximately 1,000 hp.

This is useful for applications where the load does not demand the same level of overload capability as a heavy-duty machine.

Typical examples can include large centrifugal pumps and fans with relatively smooth load characteristics.

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10.4 Controlled Motor Starting

A large motor can draw a very high current when connected directly to a fixed-frequency supply.

The variable-frequency drive provides controlled acceleration.

This can reduce mechanical shock and make the starting process much smoother.

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10.5 Adjustable Speed

The motor does not have to operate continuously at full speed.

The drive can provide variable-speed operation according to the requirements of the machine.

This is particularly useful in pump, fan, compressor, conveyor, and process applications.

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10.6 Controlled Torque

In applications where torque is important, the drive can provide more controlled motor behavior than a simple starter.

This is useful for heavy machinery, conveyors, material handling, and process equipment.

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10.7 Advanced Diagnostics

At this power level, an unexpected motor shutdown can affect an entire production system.

Diagnostic information is therefore especially valuable.

Drive status, faults, operating values, and other information can help maintenance personnel determine the source of an abnormal condition.

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10.8 Industrial Automation Integration

The drive is intended to work as part of a larger industrial automation system.

It can be connected to controllers, operator systems, supervisory systems, and industrial networks through appropriate options.

This allows motor operation to be coordinated with the rest of the production process.

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11. Typical Applications

11.1 Large Water Pumping Systems

Large pumps can require hundreds of kilowatts of motor power.

The 20G1G3D1K0LNDNNNNN provides sufficient capacity for very large pumping applications.

Typical uses include:

• Water distribution.
• Industrial water systems.
• Cooling-water systems.
• Large pumping stations.
• Process-water circulation.
• Utility pumping.

Variable-speed operation can be used to adjust flow according to actual process demand.

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12. Wastewater Applications

Wastewater treatment systems often contain large pumps and blowers.

The operating conditions can change throughout the day.

A variable-frequency drive allows the motor speed to follow the process requirement instead of relying entirely on fixed-speed operation.

For a very large wastewater facility, a drive in the D1K0 class can provide the electrical capacity needed for major pumping equipment.

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13. Large Fans and Blowers

Large industrial fans can consume substantial amounts of power.

Examples include:

• Process ventilation.
• Furnace ventilation.
• Dust extraction.
• Mining ventilation.
• Large air-handling systems.
• Industrial cooling.
• Combustion-air systems.

Variable-speed control allows airflow to be adjusted.

This can also help the plant avoid unnecessary full-speed operation when process demand is lower.

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14. Compressor Applications

Large compressors can have high motor power requirements and substantial mechanical inertia.

A high-power drive can provide controlled acceleration and adjustable speed.

This can help coordinate compressor operation with the process system.

The exact drive configuration should be matched to the compressor type, pressure requirements, acceleration profile, and control strategy.

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15. Conveyor Applications

Large conveyors can require very high motor torque during acceleration.

A sudden start can produce high mechanical stress on:

• Belts.
• Gearboxes.
• Shafts.
• Couplings.
• Bearings.
• Drive pulleys.

A variable-frequency drive allows the acceleration profile to be controlled.

The conveyor can gradually reach its operating speed rather than receiving full speed immediately.

This is especially useful for long conveyors and conveyors carrying heavy material.

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16. Mining and Heavy Industry

The D1K0 power class is suitable for many types of heavy industrial equipment.

Potential applications include:

• Large crushers.
• Mining conveyors.
• Large ventilation systems.
• Dewatering pumps.
• Material feeders.
• Process machinery.
• Large fans.
• Heavy material-handling equipment.

These applications often require high motor power and reliable operation over long periods.

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17. Process Industry Applications

Large continuous-process facilities can use very high-power motors for:

• Pumps.
• Fans.
• Compressors.
• Mixers.
• Process blowers.
• Material-handling systems.
• Cooling systems.
• Circulation systems.

The drive can become part of the process-control system and allow motor speed or torque to be coordinated with production requirements.

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18. HVAC and Utility Systems

Although smaller drives are normally sufficient for ordinary HVAC equipment, very large facilities can require drives in this power range.

Examples include:

• Large chilled-water pumps.
• Large cooling-water pumps.
• Large cooling-tower fans.
• Central ventilation systems.
• Industrial air-handling systems.

The D1K0 class becomes relevant when the motor itself approaches the very large industrial range.

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19. Low-Speed Operation

Large motors often need to operate at different speeds depending on the process.

The drive provides a controlled variable-frequency output so the motor can operate below its nominal frequency.

This can be useful for:

• Flow regulation.
• Pressure control.
• Conveyor speed adjustment.
• Process synchronization.
• Fan control.
• Compressor operation.

The actual minimum operating speed should be evaluated against motor cooling, torque requirements, and the mechanical limitations of the connected machine.

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20. Acceleration and Deceleration

The large mechanical inertia of industrial equipment can make acceleration and deceleration important design considerations.

The drive allows the engineer to define an acceleration profile.

For example, a large conveyor does not need to go immediately from zero speed to full speed.

It can be ramped gradually.

The same principle can be used for large fans, pumps, compressors, and other rotating machines.

Controlled deceleration can also reduce sudden mechanical loading.

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21. Cooling and Thermal Management

The 20G1G3D1K0LNDNNNNN uses forced-air cooling.

At this power level, heat generation is a major engineering consideration.

The electrical room must be capable of removing the heat produced by the drive.

The installation should therefore provide:

• Adequate airflow.
• Proper ventilation.
• Appropriate ambient temperature.
• Clean air passages.
• Suitable equipment spacing.
• Access for fan inspection.
• Adequate maintenance clearance.

The actual heat load should be calculated using the complete drive configuration rather than relying only on the nominal motor power.

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22. Physical Installation

A drive weighing approximately 986 kg requires careful installation planning.

The equipment should be installed on a suitable floor or mounting structure.

The floor must support the equipment weight and any additional dynamic or installation loads.

The transportation route should be checked before delivery.

Door dimensions should be verified.

Lifting equipment should be selected according to the final packaged weight.

There should also be sufficient space around the drive for service access and ventilation.

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23. Electrical Installation Considerations

The incoming power system should be designed according to the drive’s voltage and current requirements.

Important considerations include:

• Incoming disconnect.
• Protective devices.
• Short-circuit capacity.
• Grounding.
• Input cabling.
• Motor cabling.
• Control wiring.
• Communication wiring.
• Cable separation.
• Electromagnetic compatibility.
• Electrical-room ventilation.

At more than 1,000 A of output current, the associated power cables and bus structures become substantial.

The electrical installation should therefore be engineered as a complete system.

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24. Motor Selection Considerations

The following motor information should be reviewed before selecting this drive.

Motor parameter	Why it matters
Motor voltage	Must be compatible with the drive output range
Motor full-load current	Critical for drive sizing
Motor power	Establishes the approximate power class
Motor frequency	Required for correct control configuration
Motor speed	Important for operating range
Motor power factor	Affects current and system loading
Motor efficiency	Helps determine actual operating power
Overload requirement	Determines appropriate duty rating
Starting torque	Important for high-inertia machinery
Acceleration time	Determines current/torque demand
Deceleration time	Determines braking requirements
Minimum speed	Important for motor cooling
Maximum speed	Must remain within mechanical limits
Feedback requirement	Determines control configuration
Load inertia	Important for acceleration and deceleration

A drive should not be selected simply because the horsepower number appears to match the motor.

The motor’s actual full-load current is particularly important.

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25. Catalog Configuration

The requested catalog number is:

20G1G3D1K0LNDNNNNN

The major portions provide useful information about the drive configuration.

Catalog section	Practical meaning
20G	PowerFlex 755 family
1	Product configuration identifier
G	PowerFlex 755T generation/configuration
3	Floor-mounted industrial enclosure configuration
D	480 V AC, 3-phase voltage class
1K0	Approximately 1,045 A normal-duty class
L	Specific input/filtering and common-mode capacitor configuration
N…	Additional factory configuration positions

The D1K0 portion is the most useful part for identifying the voltage and current/power class.

The final characters should be interpreted using the complete catalog-number configuration table when the exact factory options are important.

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26. Five Recommended Same-Series or Closely Related Models

The following models are useful comparisons within the same high-power PowerFlex 755/755T range.

Model	Voltage class	Current class	Approx. normal-duty rating	Approx. light-duty rating	Frame	Approx. dimensions	Approx. weight
20G1G3D960LNDNNNNN	480 V, 3-phase	960 A	800 hp class	900 hp class	Frame 9	Approx. 1100 × 1400 × 2300 mm	Approx. 900–950 kg
20G1G3D1K0LNDNNNNN	480 V, 3-phase	1,045 A	900 hp	1,000 hp	Frame 9	Approx. 1100 × 1400 × 2300 mm	Approx. 986 kg
20G1G3D1K1LNDNNNNN	480 V, 3-phase	1,135 A class	1,000 hp class	1,100 hp class	Frame 9	Configuration dependent	Approx. 1,000 kg class
20G1G3D1K3LNDNNNNN	480 V, 3-phase	1,365 A class	1,100 hp class	1,250 hp class	Frame 9	Configuration dependent	Approx. 1,000 kg class
20G1G3D1K4LNDNNNNN	480 V, 3-phase	1,420–1,500 A class	1,250 hp class	1,500 hp class	Frame 10 class	Configuration dependent	Configuration dependent

The D960 is a logical neighboring model when the motor current is lower.

The D1K0 is appropriate for applications around the 900 hp normal-duty class.

The D1K1, D1K3, and D1K4 move into progressively higher current and motor-power categories.

The physical dimensions also become increasingly important as the drive rating increases.

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27. Same-Series Power Comparison

Model class	Approx. normal-duty current	Approx. normal-duty power	Approx. light-duty power	General application
D740	800 A class	650 hp	700 hp	Large industrial motor
D800	960 A class	700 hp	800 hp	Very large motor
D960	1,045 A class	800 hp	900 hp	Very large motor
D1K0	1,045 A class	900 hp	1,000 hp	Extremely large motor
D1K1	1,135 A class	1,000 hp	1,100 hp	Extremely large motor
D1K3	1,365 A class	1,100 hp	1,250 hp	Heavy industrial equipment
D1K4	1,420 A class	1,250 hp	1,500 hp	Very high-power machinery

The exact rating relationship depends on whether the drive is being evaluated under light-, normal-, or heavy-duty conditions.

This is one reason the catalog number should be evaluated together with the application duty.

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28. Five Commonly Used Models From the Same Brand

The following five models represent other widely used PowerFlex drive sizes and are included as broader comparison references.

Model	Product family	Voltage class	Current class	Approx. power	Approx. dimensions	Approx. weight
25B-D024N114	PowerFlex 525	400/480 V class	24 A	Approx. 11–15 kW	Approx. 180 × 100 × 200 mm	Approx. 3–4 kg
25B-D017N114	PowerFlex 525	400/480 V class	17 A	Approx. 7.5–11 kW	Approx. 180 × 100 × 200 mm	Approx. 3 kg
25B-D010N114	PowerFlex 525	400/480 V class	10 A	Approx. 4–5.5 kW	Approx. 180 × 100 × 200 mm	Approx. 2–3 kg
25A-D017N114	PowerFlex 523	400/480 V class	17 A	Approx. 7.5–11 kW	Approx. 180 × 100 × 200 mm	Approx. 2–3 kg
20F1ANC030JA0NNNNN	PowerFlex 753	400/480 V class	30 A class	Approx. 15–22 kW	Approx. 300 × 200 × 250 mm class	Approx. 15–20 kg

These models cover a much smaller power range than the requested D1K0.

They are useful for comparison because they show the breadth of the product family.

The compact 25B models are intended for relatively small machines.

The 20F model represents a more substantial industrial-drive category.

The 20G1G3D1K0LNDNNNNN, by contrast, is intended for very large industrial motors and can weigh close to one metric ton in its standard large-frame configuration.

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29. Comparison Between the Requested Model and Smaller Drives

Characteristic	20G1G3D1K0LNDNNNNN	25B-D024N114	20F1ANC030JA0NNNNN
Product family	PowerFlex 755	PowerFlex 525	PowerFlex 753
Voltage class	480 V	400/480 V class	400/480 V class
Current class	Approx. 1,045 A	24 A	30 A class
Normal-duty power	Approx. 900 hp	Approx. 11–15 kW	Approx. 15–22 kW
Physical size	Very large	Compact	Medium
Approx. dimensions	1100 × 1400 × 2300 mm	180 × 100 × 200 mm	300 × 200 × 250 mm class
Approx. weight	986 kg	3–4 kg	15–20 kg
Mounting	Floor-mounted	Panel/machine mounting	Panel/cabinet
Cooling	Forced air	Compact drive cooling	Forced air / configuration dependent
Typical motor size	Very large	Small/medium	Medium
Application complexity	High	Low to medium	Medium to high

The difference is substantial.

A D1K0 drive is not simply a larger version of a compact machine inverter.

It is a major industrial electrical installation component designed for motors in the high-hundreds-of-kilowatts range.

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30. Advantages for Large Pump Systems

Large pumping systems are one of the most suitable applications for this type of drive.

A pump does not always need to operate at maximum capacity.

The required flow can change according to:

• Production requirements.
• Water demand.
• Pressure.
• Tank level.
• Process conditions.
• Time of day.

The drive allows pump speed to be adjusted according to these requirements.

For very large pumping stations, the D1K0 current and power capacity provides the ability to control substantial pump motors.

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31. Advantages for Large Fan Systems

Large fans can also benefit from variable-speed control.

Instead of operating continuously at full speed, the fan can operate according to actual airflow demand.

This can be useful for:

• Industrial ventilation.
• Furnace systems.
• Dust collection.
• Mining ventilation.
• Large air-handling systems.
• Cooling systems.

The ability to control fan speed also provides greater flexibility when the process conditions change.

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32. Advantages for Conveyor Systems

For large conveyors, acceleration is often more important than maximum speed.

A controlled acceleration profile can gradually build motor torque.

This reduces sudden loading on the mechanical transmission.

It can be particularly useful when the conveyor is:

• Very long.
• Heavily loaded.
• Inclined.
• Frequently started and stopped.
• Connected to a large gearbox.
• Carrying valuable or fragile material.

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33. Advantages for Compressors

Large compressors often have high inertia and substantial power requirements.

A high-power variable-frequency drive can provide controlled acceleration.

It can also allow operating speed to be coordinated with process demand.

The exact control method should be selected according to the compressor design and process requirements.

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34. Advantages for Heavy Material Handling

Heavy material-handling machinery often requires high torque and controlled movement.

The D1K0 drive’s high current capability provides a large electrical margin for major motor applications.

Potential applications include:

• Large material feeders.
• Heavy conveyors.
• Industrial handling systems.
• Large process transport equipment.
• Heavy production machinery.

The mechanical braking requirements should be evaluated separately because high-inertia systems can require dedicated braking arrangements.

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35. Harmonic and Power-Quality Considerations

At approximately 900–1,000 hp, the electrical input power of the drive is substantial.

Power quality therefore becomes an important part of system design.

A large facility may have:

• Multiple high-power drives.
• Large transformers.
• Generators.
• Sensitive instrumentation.
• Process-control systems.
• Other nonlinear electrical loads.

The complete drive configuration should be selected according to the facility’s harmonic requirements.

The drive itself is only one part of the overall power-quality system.

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36. Maintenance Considerations

Large air-cooled drives require regular attention to their cooling system.

Maintenance personnel should inspect:

• Cooling fans.
• Air passages.
• Ventilation openings.
• Filters where installed.
• Power connections.
• Grounding connections.
• Control wiring.
• Motor cables.
• Signs of overheating.
• Fault history.
• Abnormal noise.
• Unusual vibration.

Dust is especially important.

A dusty electrical room can gradually restrict airflow and increase operating temperature.

The electrical room should therefore be kept as clean and controlled as practical.

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37. Environmental Requirements

The standard Type 1/IP21 configuration is intended for a suitable industrial indoor installation.

The drive should be protected from unnecessary exposure to:

• Water.
• Condensation.
• Conductive dust.
• Excessive airborne contamination.
• Corrosive chemicals.
• Excessive ambient temperature.
• Restricted airflow.

If the installation environment is unusually harsh, the complete enclosure and environmental configuration should be reviewed before selecting the final equipment.

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38. Mechanical Installation Planning

The approximate 986 kg equipment weight should be incorporated into the mechanical design.

The following items should be checked before installation:

Installation item	Consideration
Floor strength	Must support approximately 1 tonne of equipment
Mounting surface	Must be level and structurally suitable
Lifting equipment	Must support the final packaged weight
Door opening	Must accommodate the cabinet
Transportation path	Must allow safe movement of the drive
Service clearance	Required for maintenance
Ventilation	Required for forced-air cooling
Cable entry	Must be planned before installation
Electrical-room heat load	Must account for drive losses
Future replacement	Access should allow removal of major components

Large drives are much easier to maintain when the original installation provides enough space.

Trying to fit a nearly one-ton drive into an undersized electrical room can create significant problems later during maintenance.

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39. Recommended Selection Procedure

A practical selection procedure is:

Step 1 — Check the motor voltage

Confirm that the motor is appropriate for the 480 V-class drive system.

Step 2 — Check motor current

This is one of the most important selection values.

Step 3 — Determine the duty

Establish whether the machine is a light-duty, normal-duty, or heavy-duty application.

Step 4 — Check overload

Determine how much overload current is required and how frequently it occurs.

Step 5 — Check acceleration

Large inertia may require substantial acceleration current.

Step 6 — Check deceleration

Determine whether normal deceleration is sufficient or whether additional braking equipment is required.

Step 7 — Check feedback

Some applications need encoder or other motor-feedback systems for more precise control.

Step 8 — Check environmental conditions

Review ambient temperature, altitude, dust, humidity, and ventilation.

Step 9 — Check physical dimensions

Make sure the electrical room can accommodate the complete package.

Step 10 — Check weight and transportation

Plan the delivery and lifting procedure before ordering the equipment.

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40. Overall Technical Advantages

Advantage	Practical meaning
1,045 A normal-duty current	Suitable for very large motors
900 hp normal-duty rating	Supports major industrial machinery
1,000 hp light-duty rating	Suitable for large smooth-torque loads
480 V three-phase input class	Suitable for common large industrial power systems
Frame 9 construction	Designed for very high-power equipment
Forced-air cooling	Appropriate for properly designed electrical rooms
TotalFORCE control	High-performance motor and process control
Variable-speed operation	Allows motor speed to follow process demand
Controlled acceleration	Reduces mechanical starting shock
Controlled deceleration	Helps manage large rotating inertia
Advanced diagnostics	Supports commissioning and maintenance
Automation integration	Can be integrated into larger control systems
Large motor capability	Suitable for pumps, fans, compressors and conveyors
Floor-mounted package	Appropriate for major industrial electrical installations

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41. Final Technical Summary

Category	Specification
Model	20G1G3D1K0LNDNNNNN
Brand	Allen-Bradley
Product family	PowerFlex
Product series	PowerFlex 755
Technology	PowerFlex 755T
Product type	High-power air-cooled AC drive
Voltage class	480 V AC
Phase	3-phase
Normal-duty current	Approx. 1,045 A
Normal-duty power	Approx. 900 hp
Light-duty current	Approx. 1,135 A
Light-duty power	Approx. 1,000 hp
Frame	Frame 9
Cooling	Forced air
Mounting	Floor-mounted
Enclosure	Type 1 / IP21 class
Control	TotalFORCE
Approx. width	1100 mm
Approx. depth	1400 mm
Approx. height	2300 mm
Approx. weight	986 kg
Weight	Approximately 986 kg
Typical motor	Very large three-phase AC motor
Typical applications	Pumps, fans, blowers, compressors, conveyors, mining, process machinery and material handling
Main advantage	Very high-current, high-power industrial motor control

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42. Final Product Description

The Allen-Bradley 20G1G3D1K0LNDNNNNN is a high-power PowerFlex 755 industrial AC drive designed for very large three-phase motor applications.

Its 480 V AC three-phase configuration and approximately 1,045 A normal-duty current rating place it in the upper range of industrial variable-frequency drive applications.

The model provides approximately 900 hp normal-duty capacity and approximately 1,000 hp light-duty capacity, making it suitable for very large pumps, fans, compressors, conveyors, process machines, and other heavy industrial equipment.

The drive’s high-power architecture provides controlled motor acceleration, adjustable speed, controlled deceleration, advanced motor-control functions, diagnostics, and industrial automation integration.

Its physical size is also important.

A reference installation size of approximately 1100 × 1400 × 2300 mm and a reference weight of approximately 986 kg mean that the equipment should be treated as major floor-mounted electrical machinery.

The installation should therefore include suitable floor support, lifting arrangements, transportation access, ventilation, cable-routing space, and maintenance clearance.

The D1K0 rating is especially useful for applications where the motor operates in the approximately 900 hp normal-duty class.

For lighter and smoother loads, the approximately 1,000 hp light-duty capability provides additional capacity.

For applications with particularly demanding overload requirements, the appropriate heavy-duty catalog rating should be selected rather than assuming that the D1K0 configuration provides the same horsepower under heavy-duty conditions.

The closest related models include the D960, D1K0, D1K1, D1K3, and D1K4 configurations.

These models provide a practical range from roughly 800 hp through the 1,500 hp class and allow the drive to be matched more closely to different motor sizes and load requirements.

For smaller machinery, models from the PowerFlex 525 and PowerFlex 753 ranges are much more compact and have dramatically lower current and power ratings.

The 20G1G3D1K0LNDNNNNN should therefore be selected when the application genuinely requires this level of motor power and current capacity.

The most important engineering information for final selection is the motor nameplate voltage, full-load current, power, operating frequency, speed range, overload requirement, acceleration time, deceleration time, load inertia, braking requirement, environmental conditions, and feedback requirements.

In practical terms, this model is best viewed as a large industrial motor-control system rather than simply a large inverter.

It is intended for installations where the motor itself is a major part of the production process and where reliable variable-speed operation, controlled torque, process coordination, and high-current capability are important.

For large pumping systems, industrial fans, compressors, mining conveyors, heavy material handling, and continuous-process machinery, a drive in this class can provide the electrical capacity and control flexibility required for very large motors.

The combination of high current capability, 480 V three-phase operation, high-power motor capacity, advanced control, diagnostic capability, and industrial integration makes the 20G1G3D1K0LNDNNNNN a substantial high-power solution for demanding industrial motor applications.