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Allen-Bradley 20G1ALC770JN0NNNNN PowerFlex 755 AC Drive
1. Product Overview
The Allen-Bradley 20G1ALC770JN0NNNNN is a high-power PowerFlex 755 AC Drive designed for demanding industrial motor-control applications where high current capacity, reliable speed control, network connectivity, and flexible system integration are required.
This model is a 400 VAC, three-phase, Frame 8, air-cooled AC drive with a rated output current of 770 A. It supports multiple motor power ratings depending on the selected duty class, including 450 kW for Low Duty, 400 kW for Normal Duty, and 355 kW for Heavy Duty.
The drive uses a forced-air cooling arrangement and is designed in an 800 mm deep MCC-style, Type 1 / IP20 enclosure configuration. This construction makes it suitable for floor-standing industrial installations, motor control rooms, electrical rooms, MCC environments, and large machine systems.
The model also incorporates embedded EtherNet/IP communication, allowing the drive to be integrated into modern industrial automation networks without requiring a separate basic communication interface.
The 20G1ALC770JN0NNNNN is configured without a local HIM keypad. This makes the unit particularly suitable for applications where drive operation, monitoring, parameter configuration, and diagnostics are handled through a PLC, HMI, engineering workstation, or networked control system.
2. Brand and Product Series
| Item | Description |
|---|---|
| Brand | Allen-Bradley |
| Product Series | PowerFlex 755 |
| Product Family | PowerFlex 755 AC Drives |
| Product Type | Industrial AC Variable Frequency Drive |
| Model | 20G1ALC770JN0NNNNN |
| Drive Construction | Air Cooled |
| Frame Size | Frame 8 |
| Installation Style | Floor Standing / MCC Style |
| Cooling Method | Forced Air |
| Communication | Embedded EtherNet/IP |
| Enclosure | Type 1 / IP20 |
| Voltage Class | 400 VAC |
| Phase | 3 Phase |
| Output Current | 770 A |
| Dynamic Braking | None |
| Local HIM | No HIM / Blank |
| EMC Configuration | Filtered |
| CM Jumper | Installed |
| Input Configuration | AC Input with Precharge |
| DC Terminals | None |
The PowerFlex 755 family is positioned as a high-performance architecture-level AC drive platform for applications requiring more than simple variable-speed operation.
It is intended for systems where motor speed, torque, process control, communication, diagnostics, and system-level integration are important considerations.
3. Main Technical Parameters
| Parameter | Specification |
|---|---|
| Model | 20G1ALC770JN0NNNNN |
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Drive Type | AC Variable Frequency Drive |
| Rated Input Voltage | 400 VAC |
| Input Phase | 3 Phase |
| Rated Output Current | 770 A |
| Low-Duty Power Rating | 450 kW |
| Normal-Duty Power Rating | 400 kW |
| Heavy-Duty Power Rating | 355 kW |
| Frame Size | Frame 8 |
| Cooling | Forced Air |
| Enclosure Rating | Type 1 / IP20 |
| Installation Style | 800 mm Deep MCC Style |
| Input Type | AC Input with Precharge |
| DC Terminals | None |
| EMC Filter | Filtered |
| CM Jumper | Installed |
| Dynamic Braking | None |
| Communication | Embedded EtherNet/IP |
| Local Keypad/HIM | None |
| Control Capability | Variable-Speed Motor Control |
| PID Capability | Supported |
| Operating Temperature | Approximately -20 to 60 °C |
| Storage Temperature | Approximately -40 to 70 °C |
| Approximate Width | About 600 mm* |
| Approximate Height | About 2,000–2,400 mm* |
| Depth | 800 mm configuration |
| Approximate Weight | About 500–650 kg* |
*Large Frame 8 floor-standing equipment can vary depending on the complete mechanical arrangement, option configuration, cabinet arrangement, power structure, and installation accessories. The approximate dimensions and weight above should be used for preliminary planning only. The final mechanical drawing and project-specific configuration should be used for cabinet fabrication, transportation, lifting, and installation.
4. Electrical Rating
The 20G1ALC770JN0NNNNN is designed for a 400 VAC three-phase power system.
Its nominal output current is 770 A, placing it in the high-current range of the PowerFlex 755 family.
The large current rating makes this drive suitable for controlling high-power motors used in industrial production lines, pumps, fans, compressors, conveyors, process equipment, material-handling systems, and other heavy industrial machinery.
The drive has several duty ratings because the actual motor loading pattern has a major effect on the required drive capacity.
| Duty Classification | Power Rating | Typical Application Character |
|---|---|---|
| Low Duty | 450 kW | Applications with relatively moderate overload requirements |
| Normal Duty | 400 kW | General industrial variable-speed applications |
| Heavy Duty | 355 kW | Applications requiring higher overload capability |
| Output Current | 770 A | High-current motor control |
For equipment selection, the motor nameplate current and the actual load profile should always be considered rather than selecting the drive based only on motor horsepower or kilowatt rating.
5. 770 A Output Current Capacity
The 770 A current rating is one of the most important characteristics of this model.
A drive with this current capacity is intended for substantially larger motors than the compact PowerFlex models normally used for small machinery.
The high current capacity provides sufficient electrical capacity for large industrial motors while maintaining the advantages of adjustable-frequency operation.
Variable-frequency operation can allow the motor to accelerate and decelerate in a controlled manner instead of applying full fixed-frequency power directly to the motor.
This is particularly useful in large rotating equipment because uncontrolled starting can result in high mechanical stress, high starting current, hydraulic shock, belt stress, or process disturbances.
6. Low-Duty, Normal-Duty and Heavy-Duty Ratings
The three power ratings should not be interpreted simply as three different motor sizes that can always be interchanged.
The duty classification represents the amount and duration of overload that the drive is expected to handle.
Low-Duty Rating – 450 kW
The 450 kW Low-Duty rating is intended for applications where the motor load is comparatively moderate and the required overload capability is lower.
Typical examples can include certain large pumps, fans, blowers, and other variable-torque equipment.
Normal-Duty Rating – 400 kW
The 400 kW Normal-Duty rating represents the primary general-purpose rating for many industrial applications.
This rating can be appropriate for continuous industrial processes where the motor operates under relatively stable loading conditions.
Heavy-Duty Rating – 355 kW
The 355 kW Heavy-Duty rating is intended for applications with more demanding overload characteristics.
Examples may include conveyors, crushers, mixers, material-handling equipment, process machinery, and other applications where acceleration torque or temporary overload requirements are significant.
The actual selection should always be based on motor current, acceleration requirements, load inertia, overload profile, ambient conditions, and application duty cycle.
7. Embedded EtherNet/IP Communication
A major feature of the 20G1ALC770JN0NNNNN is its embedded EtherNet/IP communication capability.
This allows the drive to participate directly in an industrial Ethernet control architecture.
Instead of treating the drive as an isolated motor controller, the automation system can exchange operating information with the drive as part of the overall control network.
Typical information can include:
- Start and stop commands.
- Speed reference.
- Frequency reference.
- Current feedback.
- Drive status.
- Fault information.
- Alarm information.
- Motor operating condition.
- Diagnostic information.
- Parameter-related information.
This is particularly useful in automated factories where many drives, controllers, HMIs, and other industrial devices need to communicate through a common control architecture.
8. No Local HIM Configuration
The 20G1ALC770JN0NNNNN is specified with a blank/no-HIM configuration.
This means the drive does not rely on a permanently installed local Human Interface Module for normal operation.
This arrangement is useful in centralized automation systems where the drive is installed inside an electrical room, MCC, or machine enclosure and controlled remotely.
A PLC, HMI, engineering computer, or network-based control system can be used for commissioning, operation, monitoring, and diagnostics.
For applications requiring frequent local operator interaction, a related PowerFlex 755 model with an appropriate HIM configuration may be more suitable.
9. 800 mm Deep MCC-Style Construction
The drive is configured as an 800 mm deep MCC-style unit.
This is an important mechanical characteristic because this is not a small wall-mounted inverter.
The physical arrangement is intended for large industrial electrical installations and floor-standing equipment.
The 800 mm depth should be considered when designing:
- MCC sections.
- Electrical rooms.
- Drive cabinets.
- Maintenance access areas.
- Cable entry routes.
- Ventilation paths.
- Busbar arrangements.
- Lifting and transportation systems.
- Front and rear service access.
The final cabinet layout should provide adequate clearance for ventilation, cable termination, inspection, maintenance, and safe access.
10. Dimensions and Weight
Because the 20G1ALC770JN0NNNNN is a large Frame 8 floor-standing drive, its complete installation dimensions and shipping weight can depend on the exact mechanical configuration.
For preliminary engineering purposes:
| Mechanical Parameter | Approximate Value |
|---|---|
| Model | 20G1ALC770JN0NNNNN |
| Frame | Frame 8 |
| Width | Approximately 600 mm |
| Height | Approximately 2,000–2,400 mm |
| Depth | 800 mm |
| Approximate Weight | Approximately 500–650 kg |
| Installation | Floor Standing |
| Cabinet Style | MCC Style |
| Cooling | Forced Air |
| Enclosure | Type 1 / IP20 |
The 800 mm depth is associated with the specified MCC-style configuration.
The width and height should be treated as preliminary planning dimensions rather than fabrication dimensions.
For transportation and installation, the complete assembly weight can vary considerably depending on the enclosure, power structure, options, disconnecting equipment, mounting arrangement, cables, busbars, and other associated components.
For a production cabinet, lifting plan, shipping document, or mechanical drawing, the final configuration-specific dimensions and weight should be confirmed before fabrication.
11. Cooling System
The 20G1ALC770JN0NNNNN uses forced-air cooling.
At this power level, thermal management is a critical part of reliable drive operation.
The cooling system is designed to move air through the power section and remove heat generated by the semiconductor switching devices and other electrical components.
Proper ventilation is therefore extremely important.
The installation area should not restrict the air inlet or exhaust path.
The drive room should also be designed so that hot exhaust air does not simply circulate back into the drive intake.
For large industrial installations, the overall electrical-room HVAC design should consider the heat generated by the complete drive system rather than the drive alone.
12. EMC and CM Jumper Configuration
The specified model uses a filtered EMC configuration and has the CM jumper installed.
This configuration is intended to provide a defined electromagnetic compatibility arrangement for the drive.
EMC considerations become particularly important in large installations because the drive can generate high-frequency electrical components as a result of high-speed power switching.
Correct grounding, cable routing, motor cable construction, shielding, cabinet bonding, and separation of power and control wiring all contribute to good EMC performance.
The CM jumper configuration should not be changed casually.
Its final configuration should be considered together with the grounding system, power distribution arrangement, EMC requirements, and applicable installation instructions.
13. Dynamic Braking
The specified 20G1ALC770JN0NNNNN configuration is listed with no dynamic braking.
This is an important selection point for applications involving high-inertia loads.
When a large motor decelerates, mechanical energy can flow back toward the drive.
Applications with rapid stopping, high inertia, vertical movement, or frequent acceleration/deceleration may require a different braking arrangement or an appropriate regenerative solution.
Before selecting this model for a high-inertia application, the complete acceleration and deceleration profile should be reviewed.
14. Product Introduction
The PowerFlex 755 platform is designed for industrial applications where the drive must do more than simply convert fixed-frequency AC power into variable-frequency power.
It combines motor speed control with communication, diagnostics, flexible option architecture, safety-related options, and integration capabilities.
The platform is particularly suitable for large machinery and process systems where the motor drive is an important part of the overall automation system.
The 20G1ALC770JN0NNNNN represents a high-current configuration within this family and is therefore intended for large motors and demanding industrial equipment.
15. Typical Applications
Pumps
The drive can be used for large industrial pumping systems.
Variable-speed operation allows the pump motor speed to be adjusted according to process requirements.
This can be useful in water systems, industrial circulation systems, cooling systems, process plants, and large-scale pumping stations.
Water and Wastewater Systems
Large water and wastewater facilities frequently require high-power variable-speed motors.
The drive can be applied to:
- Raw-water pumps.
- Transfer pumps.
- Booster pumps.
- Treatment-process pumps.
- Sludge-handling equipment.
- Large ventilation systems.
- Aeration-related equipment.
The ability to monitor drive status through a network is particularly useful in centralized plant control systems.
Fans and Blowers
Large industrial fans and blowers are another important application.
Variable-speed control allows the equipment to operate at different process conditions instead of running continuously at full speed.
Typical applications include:
- Industrial ventilation.
- Furnace systems.
- Dust collection.
- Exhaust systems.
- Air handling.
- Process cooling.
- Combustion air systems.
Conveyors
Large conveyor systems can require substantial motor power, especially in mining, bulk-material handling, ports, cement plants, warehouses, and heavy manufacturing.
The drive can provide controlled acceleration and speed regulation.
This can help reduce mechanical shock during starting and provide better control of the material-handling process.
Mining
Mining equipment often operates under harsh and demanding load conditions.
Applications may include:
- Conveyors.
- Crushers.
- Pumps.
- Fans.
- Material-handling equipment.
- Processing machinery.
For mining applications, enclosure selection, environmental protection, cooling, cable systems, and motor selection must be evaluated as part of the complete system.
Cement and Aggregate Processing
Large motors are common in cement and aggregate production.
The drive can be considered for equipment such as:
- Large conveyors.
- Fans.
- Pumps.
- Material-handling equipment.
- Processing machines.
- Auxiliary systems.
The high-current rating makes the model suitable for applications where smaller drives would not provide sufficient motor capacity.
Pulp and Paper
Large process lines in pulp and paper manufacturing can use variable-speed drives for pumps, fans, conveyors, rollers, and other equipment.
Networked communication can simplify integration between the drive system and the plant control architecture.
Chemical and Process Industries
Process plants often require accurate and repeatable control of pumps, fans, mixers, and other rotating equipment.
The drive’s communication and diagnostic capabilities can help integrate motor control into a larger automation system.
16. Major Product Advantages
High Power Capability
The 770 A output rating allows the drive to control large industrial motors that require substantial current.
This makes it appropriate for large-scale machinery rather than small standalone equipment.
Multiple Duty Ratings
The availability of Low-Duty, Normal-Duty, and Heavy-Duty ratings gives engineers more flexibility when matching the drive to the actual load profile.
Embedded EtherNet/IP
Integrated communication reduces the need to treat the drive as an isolated device.
The drive can be incorporated into a networked industrial control system for command, monitoring, diagnostics, and data exchange.
Forced-Air Cooling
The forced-air architecture is appropriate for high-power industrial drive applications where significant heat must be removed during continuous operation.
Flexible PowerFlex 755 Platform
The PowerFlex 755 platform provides an option-oriented architecture that can be adapted to different control and communication requirements.
Industrial Construction
The Frame 8 floor-standing configuration is intended for large industrial installations.
Integrated EMC Configuration
The filtered configuration provides an established EMC arrangement for applications where electromagnetic compatibility is an important part of the installation design.
Remote Operation
The no-HIM configuration is useful for systems where the drive is controlled through a PLC, HMI, network, or centralized control station.
17. Recommended Same-Series or Closely Related Models
The following models are closely related PowerFlex 755 configurations and can be considered when comparing current capacity, operator-interface configuration, and application requirements.
| Model | Series | Voltage | Current | LD Rating | ND Rating | HD Rating | HIM |
|---|---|---|---|---|---|---|---|
| 20G1ALC650JN0NNNNN | PowerFlex 755 | 400 VAC | 650 A | 400 kW | 355 kW | 315 kW | None |
| 20G1ALC750JN0NNNNN | PowerFlex 755 | 400 VAC | 750 A | 450 kW | 400 kW | 315 kW | None |
| 20G1ALC770JN0NNNNN | PowerFlex 755 | 400 VAC | 770 A | 450 kW | 400 kW | 355 kW | None |
| 20G1ALC770JN2NNNNN | PowerFlex 755 | 400 VAC | 770 A | 450 kW | 400 kW | 355 kW | HIM Configuration |
| 20G1ALC770JN4NNNNN | PowerFlex 755 | 400 VAC | 770 A | 450 kW | 400 kW | 355 kW | Enhanced LCD / IP66 |
These models are especially useful when comparing different current ratings and operator-interface arrangements within the same high-power family.
18. Related Model: 20G1ALC650JN0NNNNN
The 20G1ALC650JN0NNNNN is a lower-current PowerFlex 755 configuration.
Its 650 A rating makes it suitable for applications where the 770 A capacity of the main model is not required.
| Parameter | Specification |
|---|---|
| Model | 20G1ALC650JN0NNNNN |
| Series | PowerFlex 755 |
| Voltage | 400 VAC |
| Phase | 3 Phase |
| Output Current | 650 A |
| Low-Duty Rating | 400 kW |
| Normal-Duty Rating | 355 kW |
| Heavy-Duty Rating | 315 kW |
| Cooling | Forced Air |
| Frame | Large Frame Configuration |
| Communication | EtherNet/IP |
| Enclosure | IP20 / Type 1 class configuration |
| HIM | No HIM |
| Dynamic Braking | Configuration dependent |
| Dimensions | Large floor-standing construction |
| Weight | Configuration dependent; verify final mechanical drawing |
This model may be considered where the motor current falls within the 650 A class.
19. Related Model: 20G1ALC750JN0NNNNN
The 20G1ALC750JN0NNNNN provides a current rating close to the 770 A model.
| Parameter | Specification |
|---|---|
| Model | 20G1ALC750JN0NNNNN |
| Series | PowerFlex 755 |
| Voltage | 400 VAC |
| Phase | 3 Phase |
| Output Current | 750 A |
| Low-Duty Rating | 450 kW |
| Normal-Duty Rating | 400 kW |
| Heavy-Duty Rating | 315 kW |
| Cooling | Forced Air |
| Communication | EtherNet/IP |
| Enclosure | Large Industrial / IP20 Configuration |
| HIM | No HIM |
| Installation | Floor Standing |
| Dimensions | Configuration dependent |
| Weight | Configuration dependent |
The 750 A model can be useful when the motor current requirement is below the 770 A class while still requiring a large PowerFlex 755 installation.
20. Related Model: 20G1ALC770JN2NNNNN
The 20G1ALC770JN2NNNNN retains the major electrical characteristics of the 770 A configuration but uses a different operator-interface arrangement.
| Parameter | Specification |
|---|---|
| Model | 20G1ALC770JN2NNNNN |
| Series | PowerFlex 755 |
| Voltage | 400 VAC |
| Phase | 3 Phase |
| Output Current | 770 A |
| Low-Duty Rating | 450 kW |
| Normal-Duty Rating | 400 kW |
| Heavy-Duty Rating | 355 kW |
| Cooling | Forced Air |
| Communication | Embedded EtherNet/IP |
| Enclosure | Type 1 / IP20, MCC Style |
| Frame | Frame 8 |
| HIM | HIM-equipped configuration |
| Installation | Floor Standing |
| Depth | Approximately 800 mm class |
| Weight | Configuration dependent |
This version can be considered when local drive interaction is required.
21. Related Model: 20G1ALC770JN4NNNNN
The 20G1ALC770JN4NNNNN is another closely related 770 A configuration.
| Parameter | Specification |
|---|---|
| Model | 20G1ALC770JN4NNNNN |
| Series | PowerFlex 755 |
| Voltage | 400 VAC |
| Phase | 3 Phase |
| Output Current | 770 A |
| Low-Duty Rating | 450 kW |
| Normal-Duty Rating | 400 kW |
| Heavy-Duty Rating | 355 kW |
| Cooling | Forced Air |
| Communication | Embedded EtherNet/IP |
| Frame | Frame 8 |
| Enclosure | Type 1 / IP20 MCC Style |
| HIM | Enhanced LCD, Full Numeric |
| HIM Protection | IP66 / NEMA Type 4X/12 |
| Installation | Floor Standing |
| Depth | 800 mm class |
| Weight | Configuration dependent |
The main practical difference is the enhanced local operator-interface configuration.
22. Five Commonly Selected Allen-Bradley Models for Comparison
The following five models are representative models from the same broad Allen-Bradley PowerFlex drive portfolio. They are useful for comparison when selecting a drive according to motor size, control requirements, and installation scale.
| Model | Product Series | Voltage Class | Approx. Current Class | Typical Power Class | Application Position |
|---|---|---|---|---|---|
| 25B-D010N104 | PowerFlex 525 | 480 VAC Class | 10 A Class | Small Motor Applications | Compact General-Purpose Drive |
| 25C-D010N103 | PowerFlex 527 | 480 VAC Class | 10 A Class | Small Motor Applications | Machine Automation |
| 20F11NC2P1JA0NNNNN | PowerFlex 753 | 480 VAC Class | Low Current Class | Small/Medium Industrial | Flexible Architecture Drive |
| 20F11NC8P0JA0NNNNN | PowerFlex 753 | 480 VAC Class | Medium Current Class | Medium Industrial | Advanced Motor Control |
| 20G1ALC770JN0NNNNN | PowerFlex 755 | 400 VAC | 770 A | Up to 450 kW LD | Large Industrial Drive |
The models above serve very different application ranges.
The PowerFlex 525 and PowerFlex 527 families are generally associated with smaller machine-level applications, while the PowerFlex 753 and PowerFlex 755 families address progressively larger and more demanding industrial motor-control requirements.
23. PowerFlex 525 Comparison
The 25B-D010N104 belongs to the PowerFlex 525 family.
Compared with the 20G1ALC770JN0NNNNN, it is intended for a completely different motor-size range.
| Parameter | 25B-D010N104 | 20G1ALC770JN0NNNNN |
|---|---|---|
| Series | PowerFlex 525 | PowerFlex 755 |
| Application Scale | Small / Machine Level | Large Industrial |
| Current Class | Approximately 10 A | 770 A |
| Voltage Class | 480 VAC Class | 400 VAC |
| Cooling | Compact Drive Cooling | Forced Air |
| Installation | Compact | Floor Standing |
| Communication | Industrial Network Options | Embedded EtherNet/IP |
| Enclosure Class | Compact Industrial | Type 1 / IP20 |
| Dimensions | Compact | Large Frame 8 |
| Weight | Several kg class depending on configuration | Hundreds of kg class for complete installation |
This comparison demonstrates the substantial difference between compact machine drives and high-power industrial drives.
24. PowerFlex 527 Comparison
The 25C-D010N103 belongs to the PowerFlex 527 family.
It is more oriented toward machine automation and coordinated control applications rather than the very high-power motor applications handled by the 20G1ALC770JN0NNNNN.
| Parameter | 25C-D010N103 | 20G1ALC770JN0NNNNN |
|---|---|---|
| Product Series | PowerFlex 527 | PowerFlex 755 |
| Current Class | Low Current | 770 A |
| Voltage Class | 480 VAC Class | 400 VAC |
| Installation | Compact | Floor Standing |
| Motor Size | Small / Medium | Large |
| Frame | Compact Frame | Frame 8 |
| Cooling | Compact Forced-Air / Drive Cooling | Forced Air |
| Communication | Networked Machine Control | Embedded EtherNet/IP |
| HIM | Application Dependent | No HIM |
| Dimensions | Compact | Large Industrial |
| Weight | Low | Approximately hundreds of kg for complete system |
25. PowerFlex 753 Comparison
The 20F11NC2P1JA0NNNNN is from the PowerFlex 753 family.
This family provides a useful intermediate comparison because it is designed for industrial motor-control applications while generally covering a smaller power range than the large Frame 8 PowerFlex 755 configuration.
| Parameter | 20F11NC2P1JA0NNNNN | 20G1ALC770JN0NNNNN |
|---|---|---|
| Series | PowerFlex 753 | PowerFlex 755 |
| Product Type | AC Drive | AC Drive |
| Application | Industrial Motor Control | Large Industrial Motor Control |
| Current | Lower Current Class | 770 A |
| Voltage | 480 VAC Class | 400 VAC |
| Frame | Smaller Frame | Frame 8 |
| Cooling | Air Cooled | Forced Air |
| Communication | Network Options | Embedded EtherNet/IP |
| Installation | Cabinet / Panel | Floor Standing |
| HIM | Configuration Dependent | No HIM |
| Dimensions | Smaller | Large |
| Weight | Lower | High |
26. PowerFlex 753 Medium-Current Comparison
The 20F11NC8P0JA0NNNNN is another PowerFlex 753 model that can be considered for medium-scale industrial motor applications.
| Parameter | 20F11NC8P0JA0NNNNN | 20G1ALC770JN0NNNNN |
|---|---|---|
| Series | PowerFlex 753 | PowerFlex 755 |
| Voltage Class | 480 VAC Class | 400 VAC |
| Current Class | Medium | 770 A |
| Application | Industrial Equipment | Large Industrial Equipment |
| Installation | Panel / Cabinet | Floor Standing |
| Frame | Smaller Frame | Frame 8 |
| Cooling | Air Cooled | Forced Air |
| Communication | Network Options | Embedded EtherNet/IP |
| Local Interface | Configuration Dependent | No HIM |
| Dimensions | Smaller | Approximately 800 mm deep class |
| Weight | Lower | Approximately 500–650 kg planning range |
27. Selection Comparison
When selecting between related models, current rating should normally be one of the first considerations.
| Selection Factor | 20G1ALC650JN0NNNNN | 20G1ALC750JN0NNNNN | 20G1ALC770JN0NNNNN |
|---|---|---|---|
| Voltage | 400 VAC | 400 VAC | 400 VAC |
| Current | 650 A | 750 A | 770 A |
| Low Duty | 400 kW | 450 kW | 450 kW |
| Normal Duty | 355 kW | 400 kW | 400 kW |
| Heavy Duty | 315 kW | 315 kW | 355 kW |
| Series | PowerFlex 755 | PowerFlex 755 | PowerFlex 755 |
| Cooling | Forced Air | Forced Air | Forced Air |
| Communication | EtherNet/IP | EtherNet/IP | EtherNet/IP |
| HIM | No HIM | No HIM | No HIM |
| Frame | Large Frame | Large Frame | Frame 8 |
| Installation | Floor Standing | Floor Standing | Floor Standing |
The 770 A version provides additional current capacity over the 750 A model and also provides a higher Heavy-Duty power rating.
28. Application Selection Guide
| Application | Suitability of 20G1ALC770JN0NNNNN | Main Consideration |
|---|---|---|
| Large Pump | Very Suitable | Motor current and variable-torque load |
| Large Fan | Very Suitable | Continuous duty and airflow |
| Large Blower | Suitable | Process load and cooling |
| Conveyor | Suitable | Starting torque and inertia |
| Mining Equipment | Suitable | Environment and overload |
| Cement Equipment | Suitable | Mechanical load profile |
| Water Treatment | Suitable | Pump duty and process control |
| Wastewater | Suitable | Pumping and aeration systems |
| Industrial Process | Suitable | Control architecture |
| Crusher | Application Dependent | High overload and mechanical stress |
| Hoist | Application Dependent | Braking and safety requirements |
| High-Inertia Machine | Application Dependent | Deceleration and braking requirements |
29. Important Considerations for Conveyor Applications
For conveyors, the drive should be selected according to actual motor current rather than motor kW alone.
Conveyor loads can vary substantially depending on material weight, conveyor length, incline, belt tension, acceleration time, and starting condition.
For long conveyors, acceleration should be carefully controlled to reduce mechanical stress.
The drive’s no-dynamic-braking configuration should also be evaluated if the conveyor has a high-inertia load or requires rapid stopping.
30. Important Considerations for Pump Applications
Pump applications often benefit from variable-speed operation.
For centrifugal pumps, reducing speed can significantly change the operating point and process output.
The drive can therefore be used to adjust pump speed according to pressure, flow, level, or other process feedback.
PID functionality can also be useful in maintaining a process variable at a desired setpoint.
The motor, pump, drive, and control system should be treated as one complete operating system during commissioning.
31. Important Considerations for Fan Applications
Large fans and blowers can operate under continuously changing process conditions.
Using a variable-frequency drive allows the motor speed to be adjusted according to the required airflow.
This can improve process controllability and avoid the need to operate the motor continuously at maximum speed.
Because the 20G1ALC770JN0NNNNN is a large forced-air-cooled drive, the electrical room ventilation system should be designed with the drive’s heat dissipation in mind.
32. Installation Considerations
The 20G1ALC770JN0NNNNN should be installed in an appropriate electrical environment.
Important considerations include:
- Adequate ventilation.
- Correct input protection.
- Correct grounding.
- Appropriate motor cable selection.
- Proper cable termination.
- Correct EMC installation.
- Adequate maintenance clearance.
- Correct cabinet ventilation.
- Appropriate ambient temperature.
- Protection against excessive dust and moisture.
- Proper lifting equipment.
- Suitable floor loading.
Because the unit is a large Frame 8 drive, transportation and installation should be planned before the equipment arrives at the site.
33. Cable Installation
High-power drives require careful attention to cable installation.
The input power cables and motor cables should be appropriately sized according to current, temperature, installation method, voltage drop, applicable electrical regulations, and motor requirements.
Motor cable routing should also be considered from an EMC perspective.
Control cables and communication cables should preferably be routed separately from high-current motor cables where the installation arrangement permits.
Correct cable termination is especially important for large-current applications.
34. Grounding
Grounding is a fundamental part of the installation.
The drive enclosure, protective earth, motor frame, cabinet, and associated equipment should be connected according to the applicable electrical installation requirements.
A poor grounding arrangement can contribute to communication problems, electromagnetic interference, nuisance trips, and safety issues.
The grounding design should be completed before commissioning rather than being treated as a troubleshooting measure after installation.
35. Maintenance
Routine maintenance is particularly important for high-power air-cooled drives.
Maintenance activities can include:
- Inspection of cooling airflow.
- Inspection of fans.
- Cleaning of ventilation paths.
- Inspection of electrical connections.
- Checking for signs of overheating.
- Inspection of cabinet ventilation.
- Review of fault history.
- Review of alarm history.
- Checking motor cable connections.
- Inspection of grounding connections.
- Inspection of environmental conditions.
Dust accumulation can reduce cooling efficiency.
For this reason, the cleanliness of the electrical room and the condition of the drive’s air path can have a direct effect on long-term reliability.
36. Commissioning
Before energizing the drive, the installation should be checked systematically.
A typical commissioning sequence includes:
- Verify the model and configuration.
- Confirm the motor nameplate information.
- Verify the incoming voltage.
- Verify the phase arrangement.
- Check protective devices.
- Confirm grounding.
- Inspect power connections.
- Inspect motor connections.
- Confirm communication wiring.
- Verify cooling and ventilation.
- Check control parameters.
- Confirm acceleration and deceleration settings.
- Check motor rotation.
- Test local or remote commands.
- Verify network communication.
- Test fault handling.
- Verify the process control loop.
- Record the final commissioning parameters.
For a 770 A drive, commissioning should be carried out by appropriately qualified personnel familiar with high-power variable-frequency drive systems.
37. No-HIM Versus HIM Configuration
One of the most practical differences between the related models is the local operator-interface configuration.
| Feature | 20G1ALC770JN0NNNNN | 20G1ALC770JN2NNNNN | 20G1ALC770JN4NNNNN |
|---|---|---|---|
| Output Current | 770 A | 770 A | 770 A |
| Low-Duty | 450 kW | 450 kW | 450 kW |
| Normal-Duty | 400 kW | 400 kW | 400 kW |
| Heavy-Duty | 355 kW | 355 kW | 355 kW |
| Voltage | 400 VAC | 400 VAC | 400 VAC |
| Frame | 8 | 8 | 8 |
| EtherNet/IP | Yes | Yes | Yes |
| Local HIM | None | HIM Configuration | Enhanced LCD / Full Numeric |
| HIM Protection | — | Configuration Dependent | IP66 / NEMA Type 4X/12 |
| Application Style | Centralized Control | Local + Remote Control | Local + Remote Control |
The JN0 configuration is particularly suitable when the drive will be managed primarily through a PLC, HMI, or network.
38. Why the 20G1ALC770JN0NNNNN Is Suitable for Large Industrial Systems
The main strength of this model is its combination of high current capacity and industrial control functionality.
A 770 A drive is not normally selected for a small machine.
It is intended for large motors and industrial processes where the motor drive represents a substantial part of the electrical system.
The PowerFlex 755 architecture also provides more flexibility than a basic variable-frequency drive.
The embedded communication capability, large-frame construction, flexible control architecture, and high power rating make it appropriate for complex industrial systems.
39. Technical Selection Checklist
Before purchasing or replacing the drive, the following items should be checked:
| Selection Item | Requirement |
|---|---|
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Model | 20G1ALC770JN0NNNNN |
| Input Voltage | 400 VAC |
| Input Phase | 3 Phase |
| Motor Current | Must be within applicable drive rating |
| Low-Duty Power | 450 kW |
| Normal-Duty Power | 400 kW |
| Heavy-Duty Power | 355 kW |
| Cooling | Forced Air |
| Frame | Frame 8 |
| Enclosure | Type 1 / IP20 |
| Installation | Floor Standing |
| Depth | 800 mm class |
| Communication | Embedded EtherNet/IP |
| HIM | No HIM |
| EMC | Filtered |
| CM Jumper | Installed |
| Dynamic Braking | None |
| Environment | Industrial electrical room |
| Approximate Weight | 500–650 kg planning range |
| Dimensions | Large Frame 8 / approximately 800 mm deep |
| Final Mechanical Data | Confirm before installation |
40. Overall Product Advantages
The Allen-Bradley 20G1ALC770JN0NNNNN provides several important advantages for large industrial motor-control applications.
First, the 770 A current rating allows it to control high-power motors that are beyond the practical range of compact variable-frequency drives.
Second, the 450 kW Low-Duty, 400 kW Normal-Duty, and 355 kW Heavy-Duty ratings give engineers flexibility when matching the drive to different load profiles.
Third, the embedded EtherNet/IP interface makes the drive suitable for networked industrial automation systems.
Fourth, the PowerFlex 755 platform provides a flexible architecture that can be adapted to different application requirements.
Fifth, the forced-air cooling system is appropriate for large industrial power levels.
Sixth, the 800 mm deep MCC-style Frame 8 construction is designed for substantial industrial electrical installations.
Seventh, the no-HIM configuration is useful when the drive is operated and monitored through centralized automation equipment.
Finally, the drive is suitable for a broad range of applications, including pumps, fans, blowers, conveyors, water and wastewater equipment, process machinery, mining equipment, cement machinery, and other large industrial systems.
41. Final Technical Summary
| Category | Final Specification |
|---|---|
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Exact Model | 20G1ALC770JN0NNNNN |
| Product Type | AC Variable Frequency Drive |
| Voltage | 400 VAC |
| Phase | 3 Phase |
| Output Current | 770 A |
| Low-Duty Rating | 450 kW |
| Normal-Duty Rating | 400 kW |
| Heavy-Duty Rating | 355 kW |
| Cooling | Forced Air |
| Frame | Frame 8 |
| Enclosure | Type 1 / IP20 |
| Installation | Floor Standing |
| MCC Style | 800 mm Deep |
| Input | AC Input with Precharge |
| DC Terminals | None |
| EMC | Filtered |
| CM Jumper | Installed |
| Dynamic Braking | None |
| Communication | Embedded EtherNet/IP |
| Local HIM | None |
| PID Control | Supported |
| Operating Temperature | Approximately -20 to 60 °C |
| Storage Temperature | Approximately -40 to 70 °C |
| Approximate Width | About 600 mm |
| Approximate Height | About 2,000–2,400 mm |
| Depth | 800 mm |
| Approximate Weight | About 500–650 kg |
| Typical Installation | Industrial Electrical Room / MCC |
| Typical Applications | Pumps, Fans, Blowers, Conveyors, Process Machinery, Mining, Water Treatment, Cement, Pulp and Paper |
42. Final Product Description
The Allen-Bradley 20G1ALC770JN0NNNNN PowerFlex 755 AC Drive is a high-capacity industrial variable-frequency drive designed for large three-phase motor applications.
With a 400 VAC input, 770 A output-current rating, 450 kW Low-Duty rating, 400 kW Normal-Duty rating, and 355 kW Heavy-Duty rating, it is designed for demanding applications where a high-power motor-control solution is required.
Its Frame 8, forced-air-cooled, 800 mm deep MCC-style construction provides a substantial industrial installation platform, while the Type 1 / IP20 enclosure configuration is intended for suitable electrical-room or cabinet environments.
The integrated EtherNet/IP communication capability makes the drive well suited to modern automation systems in which the motor drive needs to exchange commands, status information, feedback, alarms, and diagnostic data with the control system.
The no-HIM configuration makes the model particularly appropriate for centralized control architectures where operators and maintenance personnel interact with the drive through a PLC, HMI, engineering workstation, or industrial network rather than through a permanent local keypad.
The drive can be applied to large pumps, fans, blowers, conveyors, water and wastewater systems, mining equipment, cement machinery, process equipment, and other large industrial machines.
When selecting this model, the most important factors are motor current, duty cycle, acceleration and deceleration requirements, load inertia, braking requirements, environmental conditions, cooling, cable installation, grounding, communication architecture, cabinet dimensions, and maintenance access.
For preliminary planning, the drive should be regarded as a large Frame 8 floor-standing unit, with an 800 mm depth and an installation weight potentially reaching several hundred kilograms. Exact cabinet dimensions and final shipping weight should be confirmed against the specific mechanical configuration before manufacturing, transportation, lifting, or installation.
Overall, the 20G1ALC770JN0NNNNN is a high-current PowerFlex 755 configuration intended for large-scale industrial motor control where reliable variable-speed operation, network integration, flexible control, and high-power capacity are required.