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Allen-Bradley 20G1ALD740AN2NNNNN PowerFlex 755 AC Drive
1. Product Overview
The 20G1ALD740AN2NNNNN is a high-power air-cooled AC drive from the PowerFlex 755 series, designed for demanding industrial motor-control applications where high output current, stable speed control, flexible automation integration, and reliable continuous operation are required.
This model is built around a 740 A output-current rating and a 480 VAC, three-phase supply class. It uses a Frame 8 power structure and is intended for large motors and heavy industrial machinery rather than small machine applications.
The drive provides a combination of high-power motor control, embedded industrial networking, flexible control architecture, and large-system integration capability. Its 800 mm deep MCC-style construction makes it particularly suitable for centralized motor-control installations and larger electrical rooms.
The catalog number 20G1ALD740AN2NNNNN identifies a specific configuration of the PowerFlex 755 platform. The configuration includes embedded EtherNet/IP communication, forced-air cooling, AC input with precharge, no external DC terminals, Type 1/IP20 construction, EMC filtering, and the AN2 configuration.
For large industrial systems, the value of this type of drive is not simply its current rating. The drive is intended to become part of a complete motor-control system, where the drive, motor, PLC, network, instrumentation, safety functions, protection equipment, and process control strategy operate together.
2. Brand and Product Series
| Item | Description |
|---|---|
| Brand | Allen-Bradley |
| Product Family | PowerFlex |
| Product Series | PowerFlex 755 |
| Product Type | AC Variable Frequency Drive |
| Catalog Number | 20G1ALD740AN2NNNNN |
| Drive Category | High-Power Industrial AC Drive |
| Cooling | Forced-Air / Air-Cooled |
| Voltage Class | 480 VAC, Three-Phase |
| Frame Size | Frame 8 |
| Output Current | 740 A |
| Enclosure Style | Type 1 / IP20, 800 mm Deep MCC Style |
| Communication | Embedded EtherNet/IP |
| Input Configuration | AC Input with Precharge |
| External DC Terminals | None |
| Dynamic Braking | None |
| EMC Filtering | Filtered |
| CM Capacitor Configuration | AN2 configuration |
| Typical Installation | Large Industrial Motor-Control Systems |
The PowerFlex 755 series is positioned for applications where a standard compact variable-frequency drive is not sufficient and the motor-control system requires considerably higher power capacity, greater control flexibility, and integration with a plant-wide automation architecture.
3. Main Technical Parameters
| Parameter | Specification |
|---|---|
| Model | 20G1ALD740AN2NNNNN |
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Drive Type | AC Variable Frequency Drive |
| Rated Voltage | 480 VAC |
| Input Phase | 3 Phase |
| Output Current | 740 A |
| Light-Duty Rating | 700 HP class |
| Normal-Duty Rating | 650 HP class |
| Heavy-Duty Rating | 500 HP class |
| Frame | Frame 8 |
| Cooling Method | Forced Air |
| Enclosure | Type 1 / IP20 |
| Cabinet Style | 800 mm Deep MCC Style |
| Input Type | AC Input with Precharge |
| External DC Terminals | No |
| Dynamic Braking | None |
| EMC Filtering | Filtered |
| Communication | Embedded EtherNet/IP |
| HIM Configuration | No standard local HIM in the basic catalog configuration |
| Installation Class | Large Industrial Motor Control |
| Motor Application | Large Three-Phase AC Motors |
| Typical Duty | Pumps, Fans, Conveyors, Compressors, Process Machinery, Mining Equipment |
| Approx. Overall Dimensions | Approx. 2453 × 600 × 800 mm* |
| Approx. Weight | Approx. 620–725 kg* |
*Physical dimensions and shipping weight should be treated as engineering/planning figures. The final value should be confirmed against the mechanical drawing and the actual supplied cabinet or system configuration before installation, transportation, or foundation work.
4. 740 A Output Current
One of the most important characteristics of the 20G1ALD740AN2NNNNN is its 740 A current rating.
A current rating at this level places the drive firmly into the large industrial-drive category. It is intended for motors and machinery where a compact low-power inverter would not have sufficient output capability.
The 740 A rating is particularly useful in large pumps, large ventilation systems, compressors, conveyors, crushers, process equipment, fans, mixers, and other industrial machines where the motor can draw substantial current during normal operation or acceleration.
The actual motor selection should always be based on motor nameplate current, operating duty, overload requirements, ambient conditions, acceleration requirements, and application-specific load characteristics rather than horsepower alone.
5. Horsepower Ratings
The drive provides different horsepower classifications depending on the required duty.
| Duty Classification | Approximate Rating |
|---|---|
| Light Duty | 700 HP |
| Normal Duty | 650 HP |
| Heavy Duty | 500 HP |
The difference between these ratings is important when selecting the drive for a real application.
A motor operating a relatively stable load may be suitable for the higher light-duty or normal-duty rating, while a machine with frequent acceleration, high starting torque, shock loading, or significant overload requirements may need to be selected according to the heavy-duty rating.
For this reason, the 740 A rating should not be interpreted as meaning that every 700 HP motor can automatically be connected to the drive under every operating condition.
The motor’s actual full-load current and the application’s duty cycle should be checked during engineering.
6. 480 VAC Three-Phase Operation
The 20G1ALD740AN2NNNNN is designed for a 480 VAC three-phase industrial power system.
This voltage class is common in large industrial facilities, manufacturing plants, processing plants, water systems, mining installations, material-handling facilities, and large mechanical equipment installations.
Three-phase AC input provides the electrical foundation required for high-power motor-control applications.
Because this is a large-frame drive, installation normally requires careful coordination between the drive, upstream protection, disconnecting equipment, input conductors, grounding system, motor feeder, motor cable, and control system.
7. Frame 8 Construction
The drive uses a Frame 8 power structure.
Frame size is important because it affects more than the electrical rating. It also influences:
- Cabinet size
- Heat generation
- Cooling requirements
- Cable routing
- Maintenance access
- Mechanical installation
- Service clearance
- Transportation requirements
- Electrical room planning
- Replacement strategy
For a large Frame 8 drive, the installation should be planned as a complete electrical system rather than treating the drive as a small standalone panel component.
Adequate airflow and service space should be considered from the beginning of the project.
8. Forced-Air Cooling
The 20G1ALD740AN2NNNNN uses forced-air cooling.
At this power level, substantial heat is generated by the power electronics, switching devices, bus components, and associated electrical equipment.
Forced-air cooling allows the drive to move heat away from the power structure and maintain acceptable operating temperatures.
For reliable operation, the installation environment should provide:
- Adequate ventilation
- Suitable ambient temperature
- Clean cooling air
- Appropriate cabinet clearance
- Proper airflow paths
- Regular inspection of cooling components
- Appropriate dust control
In dusty environments such as mining, aggregate, cement, and bulk-material facilities, cooling-system maintenance becomes particularly important.
9. AC Input with Precharge
The drive uses an AC input with precharge configuration and does not use external DC terminals in this catalog configuration.
The precharge arrangement is important in large drives because the DC-link capacitors require controlled charging when the drive is energized.
Precharge helps manage the initial charging current and provides a controlled transition into normal DC-bus operation.
For large industrial equipment, the input power system should be designed together with the drive’s protection and disconnecting arrangement.
10. No External DC Terminals
The catalog configuration does not provide external DC terminals for the type of DC-bus connection used by some other drive configurations.
This distinction matters when designing common-DC-bus systems, regenerative systems, or applications requiring external DC-bus equipment.
If a project requires common-bus operation, regenerative braking, or external DC power integration, the drive configuration must be checked carefully before equipment is ordered.
The 20G1ALD740AN2NNNNN should therefore be considered primarily as an AC-input drive configuration rather than automatically assuming that it can be integrated into any DC-bus architecture.
11. Embedded EtherNet/IP Communication
One of the useful characteristics of the PowerFlex 755 platform is its ability to integrate into an industrial Ethernet control architecture.
The drive includes embedded EtherNet/IP communication, allowing it to communicate with higher-level automation equipment and control systems.
Typical network functions can include:
- Start and stop commands
- Speed references
- Frequency references
- Motor status
- Current feedback
- Drive status
- Fault information
- Warning information
- Diagnostic information
- Parameter management
- Process-control information
- Production monitoring
This makes the drive suitable for plants where motor control is centralized through a PLC or supervisory automation system.
12. Type 1 / IP20, 800 mm Deep MCC-Style Construction
The enclosure configuration is Type 1 / IP20 with an 800 mm deep MCC-style arrangement.
This is a significant mechanical characteristic.
The enclosure is intended for installation in an appropriate controlled industrial electrical environment rather than direct exposure to severe outdoor weather.
The 800 mm depth should be considered during:
- Electrical-room layout
- Cabinet positioning
- Cable-entry planning
- Rear clearance planning
- Front service access
- Maintenance access
- Transportation
- Door opening arrangements
- Heat dissipation planning
A large Frame 8 drive can be a substantial piece of equipment, so mechanical planning should be completed before delivery.
13. EMC Filtering
The model configuration includes filtering intended to support electromagnetic compatibility requirements.
Filtering is particularly relevant in large variable-frequency-drive installations because high-frequency switching can produce conducted and radiated electrical noise.
A properly designed installation should consider:
- Motor cable length
- Cable shielding
- Grounding
- Bonding
- Cabinet construction
- Control cable separation
- Encoder cable routing
- Communication cable routing
- Input filtering
- Motor-side interference
EMC performance is therefore not determined by the drive alone. The complete installation has to be designed correctly.
14. CM Capacitor Configuration
The AN2 portion of the catalog number identifies a particular common-mode capacitor configuration within this drive family.
This configuration should not be changed casually after installation.
Grounding arrangements, leakage current, EMC requirements, power-system characteristics, and the intended installation environment should all be considered when determining the appropriate configuration.
For applications with unusual grounding systems or special power-distribution arrangements, the drive configuration should be reviewed by the electrical engineer responsible for the installation.
15. Dynamic Braking
The basic configuration of this catalog number does not include dynamic braking.
This does not mean that the drive cannot be used with applications involving deceleration; it means that the catalog configuration itself is not equipped with the internal dynamic-braking arrangement associated with certain other configurations.
For high-inertia loads, rapid deceleration requirements, hoisting equipment, centrifuges, or applications where regenerated energy is significant, braking requirements should be calculated separately.
The required solution may involve a different drive configuration or an appropriately engineered braking system.
16. Approximate Dimensions and Weight
Because this is a large Frame 8 industrial drive, physical installation requirements are considerably greater than those of compact machine drives.
| Mechanical Item | Approximate Value |
|---|---|
| Model | 20G1ALD740AN2NNNNN |
| Frame | Frame 8 |
| Approx. Height | 2453 mm |
| Approx. Width | 600 mm |
| Approx. Depth | 800 mm |
| Approx. Weight | 620–725 kg |
| Enclosure Style | Type 1 / IP20 |
| Cabinet Depth Class | 800 mm MCC Style |
| Cooling | Forced Air |
| Installation | Floor-mounted industrial equipment |
The figures above should be used for preliminary planning rather than treated as fabrication dimensions.
For a project involving foundations, shipping, lifting equipment, doors, elevator capacity, cable trenches, or cabinet lineups, the final mechanical drawing should be used.
The weight is especially important because a drive of this size may require specialized transportation and lifting arrangements.
17. Installation Considerations
The physical size and weight of the drive make installation planning an important part of project engineering.
The installation location should provide sufficient clearance for cooling air, electrical connections, maintenance access, and safe operation.
The floor or supporting structure should be capable of carrying the equipment weight.
Cable routing should also be planned before the cabinet arrives.
For a 740 A drive, the power conductors can be physically large, so cable-bending radius and termination space should be considered during electrical-room design.
18. Typical Applications
The 20G1ALD740AN2NNNNN is intended for large industrial motor applications.
Typical applications include:
| Application | Typical Motor-Control Requirement |
|---|---|
| Large Pumps | Variable flow and pressure control |
| Large Fans | Airflow and ventilation control |
| Conveyors | Speed control and controlled acceleration |
| Compressors | Process pressure and flow control |
| Crushers | Large motor torque management |
| Mills | High-power process motor control |
| Mining Equipment | Large mechanical-load control |
| Cement Equipment | High-power continuous-duty operation |
| Aggregate Equipment | Conveyor and processing machinery |
| Water Treatment | Large pump and blower control |
| Process Machinery | Controlled motor speed and torque |
| Material Handling | Smooth starting and stopping |
| Industrial Ventilation | Variable airflow |
| Large Mixers | Controlled acceleration and process speed |
19. Pump Applications
Large pumps are one of the most natural applications for a high-power variable-frequency drive.
Instead of operating a motor at one fixed speed, the drive can adjust motor speed according to process demand.
This can be useful for:
- Water supply
- Cooling-water systems
- Industrial circulation
- Process pumping
- Wastewater systems
- Irrigation
- Chemical process pumping
- Large transfer pumps
Variable-speed operation can also help reduce mechanical stress associated with direct starting and sudden changes in flow.
20. Fan and Blower Applications
Large fans and blowers frequently require variable-speed control.
The drive can be used to regulate airflow according to actual process demand.
Potential applications include:
- Factory ventilation
- Furnace systems
- Dust collection
- HVAC air handling
- Tunnel ventilation
- Mining ventilation
- Cement production
- Industrial exhaust systems
For systems where airflow demand changes significantly during the production cycle, variable-speed control can provide more flexible operation than fixed-speed motor control.
21. Conveyor Applications
Large conveyors can require substantial motor power, especially in mining, aggregate, cement, bulk handling, and material-processing applications.
A large drive can provide controlled acceleration and deceleration.
This can reduce mechanical shock to:
- Gearboxes
- Couplings
- Conveyor belts
- Shafts
- Bearings
- Drive pulleys
- Material-handling equipment
For long conveyors, coordinated control and communication between multiple motor-control points can also be important.
22. Mining Applications
Mining equipment can involve very large motors and demanding load conditions.
Potential applications include:
- Belt conveyors
- Crushers
- Large fans
- Pumps
- Hoisting-related auxiliary machinery
- Material-processing systems
- Grinding equipment
- Dewatering systems
The large current capability of the 20G1ALD740AN2NNNNN makes it appropriate for the high-power motor range encountered in these environments.
However, mining installations often have severe environmental conditions, so the standard IP20/Type 1 configuration may require installation inside a properly protected electrical room or enclosure system.
23. Cement and Aggregate Applications
Cement and aggregate facilities contain many high-power motor loads.
Examples include:
- Crushers
- Conveyors
- Fans
- Blowers
- Mills
- Pumps
- Material feeders
- Processing equipment
- Dust collection systems
A high-power drive can provide controlled motor speed while allowing the process-control system to adjust operating conditions according to production requirements.
24. Compressor Applications
Large compressors can have significant starting and operating power requirements.
A variable-frequency drive can provide controlled acceleration and speed regulation.
This may be useful in:
- Industrial air systems
- Process gas systems
- Refrigeration systems
- Production facilities
- Chemical processing
- Petrochemical auxiliary systems
The compressor manufacturer’s motor-control requirements should always be checked before selecting the drive.
25. Process Machinery
The drive is also suitable for large process machines where speed, torque, and acceleration need to be controlled accurately.
Examples include:
- Large mixers
- Extrusion-related equipment
- Processing machinery
- Large material-handling machines
- Industrial production lines
- Large rotating machinery
The PowerFlex 755 architecture allows the drive to be incorporated into larger control systems rather than operating as an isolated motor controller.
26. Major Product Advantages
High Current Capability
The 740 A output rating allows the drive to control large industrial motors.
This is one of the main reasons to select this class of equipment rather than a smaller machine-oriented inverter.
High-Power Motor Control
The drive supports motors in the several-hundred-horsepower range, making it suitable for major process equipment.
Embedded EtherNet/IP
Built-in industrial Ethernet communication simplifies integration into centralized automation architectures.
Flexible Industrial Control
The PowerFlex 755 platform is designed for applications requiring more control flexibility than basic variable-speed motor control.
Forced-Air Cooling
Forced-air cooling is appropriate for high-power electrical equipment where large amounts of heat must be removed.
MCC-Style Construction
The 800 mm deep MCC-style arrangement makes the product suitable for larger electrical-room and motor-control installations.
AC Precharge Architecture
The AC input with precharge arrangement provides a controlled energization method for the high-power DC bus.
Industrial Application Range
The same general drive platform can be used across pumps, fans, conveyors, compressors, process equipment, mining machinery, and other large motor applications.
27. Five Recommended Related PowerFlex 755 Models
The following models are closely related to the target model and can be useful when comparing current capacity, duty rating, or configuration.
| Model | Current | Typical Power Class | Voltage | Frame | Key Difference |
|---|---|---|---|---|---|
| 20G1ALD617AN0NNNNN | 617 A | 600 HP LD / 500 HP ND / 400 HP HD | 480 VAC, 3 PH | 8 | Lower-current related model |
| 20G1ALD710AN0NNNNN | 710 A | 650 HP LD / 600 HP ND / 450 HP HD | 480 VAC, 3 PH | 8 | Slightly lower current |
| 20G1ALD710AN2NNNNN | 710 A | 650 HP LD / 600 HP ND / 450 HP HD | 480 VAC, 3 PH | 8 | Similar AN2 configuration |
| 20G1ALD740AN0NNNNN | 740 A | 700 HP LD / 650 HP ND / 500 HP HD | 480 VAC, 3 PH | 8 | Same current with different CM configuration |
| 20G1ALD740JN2NNNNN | 740 A | 700 HP LD / 650 HP ND / 500 HP HD | 480 VAC, 3 PH | 8 | Same current with CM jumper installed |
These models are useful for engineering comparison because they remain within the same general PowerFlex 755 high-power platform.
The 617 A and 710 A versions can be considered when the motor current is below the requirement of the 740 A model.
The 740 A variants are particularly useful when the application requires the full current capability but the electrical configuration needs to be adjusted.
28. Current-Rating Comparison
| Model | Output Current | Light Duty | Normal Duty | Heavy Duty |
|---|---|---|---|---|
| 20G1ALD617AN0NNNNN | 617 A | 600 HP | 500 HP | 400 HP |
| 20G1ALD710AN0NNNNN | 710 A | 650 HP | 600 HP | 450 HP |
| 20G1ALD710AN2NNNNN | 710 A | 650 HP | 600 HP | 450 HP |
| 20G1ALD740AN0NNNNN | 740 A | 700 HP | 650 HP | 500 HP |
| 20G1ALD740AN2NNNNN | 740 A | 700 HP | 650 HP | 500 HP |
| 20G1ALD740JN2NNNNN | 740 A | 700 HP | 650 HP | 500 HP |
The progression from 617 A to 710 A and then 740 A gives engineers several closely related options for matching the drive to motor current.
29. Same-Current 740 A Comparison
| Model | Current | Voltage | Frame | Filtering | CM Configuration | Input |
|---|---|---|---|---|---|---|
| 20G1ALD740AN0NNNNN | 740 A | 480 VAC | 8 | Filtered | Jumper Removed | AC + Precharge |
| 20G1ALD740AN2NNNNN | 740 A | 480 VAC | 8 | Filtered | AN2 Configuration | AC + Precharge |
| 20G1ALD740JN0NNNNN | 740 A | 480 VAC | 8 | Filtered | Jumper Installed | AC + Precharge |
| 20G1ALD740JN2NNNNN | 740 A | 480 VAC | 8 | Filtered | Jumper Installed / AN2 | AC + Precharge |
These models demonstrate why the final characters of a large drive catalog number are important.
Two drives may have the same current, voltage, horsepower rating, and frame size while still having different electrical configurations.
30. Five Popular Related Models from the Same Brand
The following five models provide a broader comparison across the manufacturer’s PowerFlex product family.
| Model | Series | General Application | Typical Position |
|---|---|---|---|
| 25B-D010N104 | PowerFlex 525 | Compact machine and general-purpose motor control | Small industrial machines |
| 25C-D010N103 | PowerFlex 527 | Networked machine motor control | Machine automation |
| 20F11NC2P1JA0NNNNN | PowerFlex 753 | Industrial motor and process control | Medium/large industrial equipment |
| 20F11NC8P0JA0NNNNN | PowerFlex 753 | Larger industrial motor-control systems | Process and production equipment |
| 20G1ALD740AN2NNNNN | PowerFlex 755 | High-power industrial motor control | Large motors and major process equipment |
The important point is that these models do not occupy exactly the same electrical class.
The smaller PowerFlex models are generally intended for compact machinery and lower-power applications, while the PowerFlex 753 and PowerFlex 755 families address progressively larger and more demanding industrial installations.
31. Product Family Comparison
| Model | Series | General Power Class | Typical Application |
|---|---|---|---|
| 25B-D010N104 | PowerFlex 525 | Compact | Conveyors, pumps, fans, machines |
| 25C-D010N103 | PowerFlex 527 | Compact / machine | Networked machine control |
| 20F11NC2P1JA0NNNNN | PowerFlex 753 | Medium to large | Industrial machinery |
| 20F11NC8P0JA0NNNNN | PowerFlex 753 | Larger industrial | Process equipment |
| 20G1ALD740AN2NNNNN | PowerFlex 755 | Very high power | Large industrial motors |
32. Why the PowerFlex 755 Series Is Suitable for Large Systems
A major advantage of the PowerFlex 755 family is that it can be incorporated into a larger industrial automation architecture.
For a large factory, one drive may control a pump, another may control a conveyor, another may control a fan, while all of them exchange operating information with the plant control system.
This creates a consistent control structure across the facility.
For maintenance teams, standardized drive families can also simplify training, diagnostics, spare-parts planning, and troubleshooting.
33. Control-System Integration
The drive can form part of a control architecture containing:
- PLC
- HMI
- SCADA
- Industrial Ethernet
- Motor protection
- Sensors
- Process transmitters
- Encoders
- Interlocks
- Safety equipment
- Supervisory control systems
For example, a large pump can receive a speed reference from the control system, while the drive returns motor current, speed, status, fault, and diagnostic information.
This allows the motor controller to become part of the process rather than simply acting as an independent frequency converter.
34. Energy Management Applications
Variable-speed operation can provide process benefits when the mechanical load does not always need full-speed operation.
For pump and fan applications in particular, reducing motor speed can significantly change the mechanical power requirement.
Instead of continuously operating a motor at full speed and controlling the process through mechanical throttling or other methods, the drive can adjust motor speed to match process demand.
Actual energy savings depend on the application, motor characteristics, process requirements, operating schedule, and system design.
35. Motor Selection Considerations
When selecting a motor for the 20G1ALD740AN2NNNNN, the following information should be reviewed:
| Motor Parameter | Importance |
|---|---|
| Motor Voltage | Must be compatible with drive output |
| Motor Current | Critical for drive sizing |
| Motor Power | Used together with current and duty |
| Motor Frequency | Determines operating range |
| Motor Speed | Required for process control |
| Motor Type | Must be compatible with drive control method |
| Service Factor | Important for load analysis |
| Duty Cycle | Determines thermal and overload requirements |
| Starting Torque | Important for conveyors and heavy loads |
| Peak Torque | Important for shock loads |
| Cable Length | Can affect installation and motor protection |
| Encoder Requirement | Relevant to high-performance applications |
Horsepower alone should not be used as the only selection criterion.
36. Electrical Installation Planning
For a drive of this size, the electrical installation should be engineered carefully.
Important areas include:
- Incoming power
- Input protection
- Disconnect equipment
- Grounding
- Motor feeder
- Motor cable
- Control wiring
- Communication wiring
- Shielding
- EMC
- Short-circuit coordination
- Thermal management
- Cabinet ventilation
The 740 A rating means that the incoming and outgoing power connections can involve substantial conductors and significant installation space.
37. Maintenance Advantages
Large industrial drives require a structured maintenance program.
Important maintenance activities can include:
- Inspecting cooling airflow
- Checking fans
- Inspecting electrical connections
- Checking for dust accumulation
- Reviewing fault history
- Monitoring operating temperature
- Checking cabinet ventilation
- Inspecting communication connections
- Reviewing motor current
- Monitoring abnormal vibration or noise from the motor system
Preventive maintenance is especially important in continuous-production facilities where unexpected motor-drive failure can result in significant downtime.
38. Application Selection Table
| Application | Suitability of 20G1ALD740AN2NNNNN | Main Reason |
|---|---|---|
| Large Water Pump | Suitable | High-current variable-speed control |
| Large Fan | Suitable | Variable airflow control |
| Mining Conveyor | Suitable | Large motor and controlled acceleration |
| Crusher | Suitable | High-power motor control |
| Cement Equipment | Suitable | Large process motors |
| Industrial Compressor | Suitable | High-power speed regulation |
| Large Blower | Suitable | Airflow management |
| Material Handling | Suitable | Controlled acceleration/deceleration |
| Process Mixer | Suitable | High-power torque control |
| Large Industrial Machine | Suitable | Flexible motor control |
| Small Machine | Generally oversized | Drive capacity exceeds typical requirement |
The suitability of the drive should always be confirmed against the actual motor current and application duty.
39. Mechanical Planning Table
| Item | Planning Requirement |
|---|---|
| Model | 20G1ALD740AN2NNNNN |
| Frame | Frame 8 |
| Approx. Height | 2453 mm |
| Approx. Width | 600 mm |
| Approx. Depth | 800 mm |
| Approx. Weight | 620–725 kg |
| Cooling | Forced Air |
| Enclosure | Type 1 / IP20 |
| Installation | Industrial Electrical Room |
| Floor Support | Must support high equipment weight |
| Service Access | Required |
| Airflow | Must remain unobstructed |
| Cable Routing | Must be planned before installation |
| Transportation | Heavy-equipment handling may be required |
40. Electrical Planning Table
| Parameter | Design Consideration |
|---|---|
| Input Voltage | 480 VAC |
| Input Phase | Three Phase |
| Output Current | 740 A |
| Input Arrangement | AC with Precharge |
| External DC Terminals | None |
| Dynamic Braking | None |
| Communication | Embedded EtherNet/IP |
| EMC | Filtered |
| Motor | Large Three-Phase AC Motor |
| Grounding | Industrial grounding system required |
| Motor Cable | Sized according to installation requirements |
| Protection | Upstream protection must be engineered |
| Cooling | Forced Air |
| Installation Environment | Controlled industrial environment |
41. Important Catalog-Number Details
The catalog number should not be treated as an arbitrary sequence of characters.
Different portions identify different configuration characteristics.
For example, the difference between an AN0, AN2, and JN2 configuration can involve electrical configuration details even though the drive current and horsepower ratings remain the same.
This is why replacing one PowerFlex 755 drive with another drive that merely has the same current rating is not necessarily a direct replacement.
The complete catalog number should be compared.
42. Replacement Considerations
When replacing an existing large drive, the following information should be recorded before ordering the replacement:
- Complete catalog number.
- Motor nameplate current.
- Motor horsepower.
- Motor voltage.
- Motor frequency.
- Motor speed.
- Existing control method.
- Network type.
- Existing braking arrangement.
- Existing enclosure.
- Existing cable configuration.
- Existing grounding arrangement.
- Existing cabinet dimensions.
- Existing cooling arrangement.
- Existing parameter configuration.
- Existing PLC communication structure.
This approach reduces the risk of ordering a drive with the correct current rating but the wrong electrical configuration.
43. Five Closely Related Models – Detailed Table
| Model | Current | LD Rating | ND Rating | HD Rating | Frame | Voltage | Main Relationship |
|---|---|---|---|---|---|---|---|
| 20G1ALD617AN0NNNNN | 617 A | 600 HP | 500 HP | 400 HP | 8 | 480 VAC | Lower-current option |
| 20G1ALD710AN0NNNNN | 710 A | 650 HP | 600 HP | 450 HP | 8 | 480 VAC | Lower-current option |
| 20G1ALD710AN2NNNNN | 710 A | 650 HP | 600 HP | 450 HP | 8 | 480 VAC | AN2-related configuration |
| 20G1ALD740AN0NNNNN | 740 A | 700 HP | 650 HP | 500 HP | 8 | 480 VAC | Same current, different CM configuration |
| 20G1ALD740JN2NNNNN | 740 A | 700 HP | 650 HP | 500 HP | 8 | 480 VAC | Same current, alternate configuration |
44. Five Same-Brand Models – Detailed Comparison
| Model | Series | Approx. Application Class | Main Use |
|---|---|---|---|
| 25B-D010N104 | PowerFlex 525 | Compact | General machine motor control |
| 25C-D010N103 | PowerFlex 527 | Compact / networked | Automated machine systems |
| 20F11NC2P1JA0NNNNN | PowerFlex 753 | Medium/large industrial | Process and industrial machinery |
| 20F11NC8P0JA0NNNNN | PowerFlex 753 | Large industrial | Large motor applications |
| 20G1ALD740AN2NNNNN | PowerFlex 755 | Very high power | Large process and industrial motors |
45. Practical Advantages in Large Industrial Plants
The biggest practical advantage of this model is its ability to handle a very large motor while remaining part of an integrated automation system.
For a production facility, this can simplify the overall control architecture.
A single high-power drive can control a large motor while providing operating information to the plant control system through industrial networking.
This makes it possible to coordinate motor speed with process variables such as:
- Flow
- Pressure
- Temperature
- Production rate
- Material throughput
- Air volume
- Conveyor speed
- Pump demand
The result is a motor-control solution that can be integrated directly into the production process.
46. Advantages for Maintenance Teams
From a maintenance perspective, a standardized drive family can simplify troubleshooting.
Technicians can work with consistent concepts for:
- Fault codes
- Drive status
- Motor current
- Speed reference
- Network communication
- Parameter configuration
- Preventive maintenance
- Replacement planning
For facilities with many variable-speed motors, standardizing around a common drive family can also simplify spare-parts management and technical training.
47. Advantages for System Engineers
For system engineers, the main benefits include:
- High current capacity
- Large motor compatibility
- Embedded industrial networking
- Flexible control architecture
- Large-frame construction
- Industrial process suitability
- Multiple related current ratings
- Multiple configuration options
- Integration with centralized automation
- Broad application range
The drive can therefore be considered a system-level component rather than simply a motor-speed controller.
48. Product Selection Checklist
Before purchasing the 20G1ALD740AN2NNNNN, check the following:
| Check Item | Required |
|---|---|
| Motor Voltage | Confirm |
| Motor Full-Load Current | Confirm |
| Motor Horsepower | Confirm |
| Duty Classification | Confirm |
| Input Voltage | Confirm |
| Input Frequency | Confirm |
| Motor Cable Length | Confirm |
| Braking Requirement | Confirm |
| Network Requirement | Confirm |
| EMC Requirements | Confirm |
| Grounding System | Confirm |
| Cabinet Dimensions | Confirm |
| Floor Loading | Confirm |
| Cooling Requirements | Confirm |
| Service Clearance | Confirm |
| Replacement Catalog Number | Confirm |
This checklist is especially important for a high-power drive because installation errors can have a much larger impact than with a small machine drive.
49. Overall Technical Summary
| Category | Specification |
|---|---|
| Model | 20G1ALD740AN2NNNNN |
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Product Type | High-Power AC Drive |
| Voltage | 480 VAC |
| Phase | Three Phase |
| Current | 740 A |
| Light Duty | 700 HP |
| Normal Duty | 650 HP |
| Heavy Duty | 500 HP |
| Frame | 8 |
| Cooling | Forced Air |
| Enclosure | Type 1 / IP20 |
| Cabinet Style | 800 mm Deep MCC Style |
| Input | AC with Precharge |
| External DC Terminals | None |
| Dynamic Braking | None |
| Filtering | Filtered |
| Communication | Embedded EtherNet/IP |
| Typical Applications | Pumps, Fans, Conveyors, Compressors, Mining, Cement, Process Machinery |
| Approx. Dimensions | 2453 × 600 × 800 mm |
| Approx. Weight | 620–725 kg |
50. Final Product Description
The 20G1ALD740AN2NNNNN is a high-power Allen-Bradley PowerFlex 755 AC drive designed for large industrial motor-control applications.
With a 740 A output rating, 480 VAC three-phase operation, and Frame 8 construction, it is intended for large motors and demanding industrial machinery.
Its approximate duty classifications of 700 HP light duty, 650 HP normal duty, and 500 HP heavy duty make it suitable for a broad range of large rotating equipment, subject to actual motor current and application duty requirements.
The drive uses forced-air cooling and an 800 mm deep MCC-style Type 1/IP20 construction, making it suitable for installation in a controlled industrial electrical environment.
The integrated EtherNet/IP communication capability allows the drive to participate in centralized automation systems, while the AC input with precharge provides the electrical architecture required for this high-power drive class.
Typical applications include large pumps, fans, blowers, conveyors, compressors, mining machinery, cement equipment, aggregate processing equipment, water systems, material-handling systems, and other high-power process machinery.
One of the most important characteristics of this model is its combination of high current capacity and industrial automation integration. It is not simply a high-power frequency converter; it can serve as an important control component within a larger plant automation system.
For equipment selection, the most important checks are the motor full-load current, motor voltage, required duty rating, overload requirements, braking requirements, environmental conditions, cabinet arrangement, cooling requirements, and communication architecture.
The related 617 A, 710 A, and 740 A PowerFlex 755 models provide useful alternatives when the motor current or electrical configuration differs from the requirements of the application.
For mechanical planning, the approximate 2453 × 600 × 800 mm size and 620–725 kg planning weight should be considered, while the final project should use the actual supplied mechanical documentation for foundation, transportation, lifting, clearance, and cabinet-layout decisions.
Overall, the 20G1ALD740AN2NNNNN belongs to the high-power end of the PowerFlex 755 family and is particularly suited to large industrial installations where high motor current, controlled acceleration, variable-speed operation, industrial networking, and centralized automation are required.