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Allen-Bradley 20G1ALC770AN2NNNNN PowerFlex 755 AC Drive
1. Product Overview
The Allen-Bradley 20G1ALC770AN2NNNNN is a high-power PowerFlex 755 AC drive designed for large industrial motor-control applications.
It is part of the PowerFlex 755 family and is intended for demanding applications where high motor current, substantial power capacity, variable-speed operation, and integration with an industrial automation network are required.
The drive is configured for a 400 VAC three-phase power system and provides a 770 A output-current rating. Its published duty ratings are 450 kW for light-duty operation, 400 kW for normal-duty operation, and 355 kW for heavy-duty operation.
The drive uses a Frame 8 architecture with forced-air cooling and an 800 mm deep MCC-style construction. The input configuration uses AC input with precharge, and the specified configuration has no DC terminals.
A key feature of this particular model is its Enhanced LCD, Full Numeric, Handheld/Local HIM configuration. This provides a local operator interface for commissioning, parameter adjustment, monitoring, and troubleshooting.
The drive also incorporates embedded EtherNet/IP communication, allowing it to be integrated into a larger industrial automation network.
2. Brand and Product Series
| Item | Specification |
|---|---|
| Brand | Allen-Bradley |
| Product Family | PowerFlex |
| Product Series | PowerFlex 755 |
| Product Type | High-Power AC Variable Frequency Drive |
| Model | 20G1ALC770AN2NNNNN |
| Application | Industrial Motor Control |
| Voltage Class | 400 VAC |
| Phase | Three Phase |
| Frame | Frame 8 |
| Cooling | Forced Air |
| Installation Style | 800 mm Deep MCC Style |
| Communication | Embedded EtherNet/IP |
| Enclosure | Type 1 / IP20 |
| Input Configuration | AC Input with Precharge |
| DC Terminals | None |
| EMC Configuration | Filtered |
| CM Jumper | Removed |
| Dynamic Braking | None |
| HIM | Enhanced LCD, Full Numeric, Handheld/Local HIM |
The PowerFlex 755 series is positioned for large industrial applications where the drive must do considerably more than simply start and stop a motor.
It can provide variable-speed control, torque control, network communication, diagnostics, local setup, and integration into a larger automation system.
3. Complete Main Technical Parameters
| Parameter | Specification |
|---|---|
| Model | 20G1ALC770AN2NNNNN |
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Drive Type | AC Variable Frequency Drive |
| Input Voltage | 400 VAC |
| Input Phase | 3 Phase |
| Rated Output Current | 770 A |
| Light-Duty Rating | 450 kW |
| Normal-Duty Rating | 400 kW |
| Heavy-Duty Rating | 355 kW |
| Frame Size | Frame 8 |
| Cooling | Forced Air |
| Input Type | AC Input with Precharge |
| DC Terminals | None |
| Enclosure | Type 1 / IP20 |
| Installation | 800 mm Deep MCC Style |
| EMC Filter | Filtered |
| CM Jumper | Removed |
| Dynamic Braking | None |
| Communication | Embedded EtherNet/IP |
| HIM | Enhanced LCD, Full Numeric, Handheld/Local HIM |
| Installation Environment | Indoor industrial installation |
| Approx. Width | Approximately 600 mm |
| Approx. Height | Approximately 2,000–2,400 mm |
| Approx. Depth | Approximately 800 mm |
| Approx. Weight | Approximately 500–650 kg |
| Cooling Requirement | Forced-air ventilation |
| Application Class | Large industrial motor control |
The exact overall cabinet dimensions and shipping weight can vary depending on the complete installation arrangement, accessories, power connections, cabinet structure, and other configuration details.
The 800 mm depth is the important specified MCC-style dimension. For engineering, transportation, lifting, and cabinet-layout work, the final mechanical drawing for the supplied configuration should always take precedence over planning estimates.
4. Electrical Rating
The 20G1ALC770AN2NNNNN is a 400 VAC, three-phase high-power AC drive.
Its 770 A rating makes it suitable for very large industrial motors.
The principal duty ratings are:
| Duty | Output Current / Rating | Motor Power |
|---|---|---|
| Light Duty | High-current operation | 450 kW |
| Normal Duty | 770 A class | 400 kW |
| Heavy Duty | Reduced current according to duty requirement | 355 kW |
The difference between these ratings is important.
A 450 kW light-duty application is not automatically equivalent to a 450 kW heavy-duty application.
The actual motor current, overload requirement, acceleration characteristics, torque profile, and process duty cycle must be considered.
For a pump or fan with a relatively smooth load, the light-duty or normal-duty rating may be appropriate.
For a conveyor, mixer, crusher, or other high-torque application, the heavy-duty rating becomes more important.
5. 770 A Current Capacity
The 770 A current rating is one of the defining characteristics of this drive.
This is a large industrial current class intended for substantial motors and mechanical systems.
A drive of this size is typically installed in an industrial electrical room, MCC lineup, large control cabinet, or dedicated motor-control system.
The high current rating provides sufficient electrical capacity for applications involving large motors while still allowing variable-speed operation.
The drive is therefore appropriate for systems where a compact drive would not have sufficient output capacity.
6. 450 kW Light-Duty Rating
The 450 kW light-duty rating provides the highest stated motor-power capacity for this configuration.
This rating is most relevant to applications where the mechanical load does not require the same overload capability as a heavy-duty application.
Examples can include certain centrifugal pumps and fans.
A large centrifugal pump generally has a very different torque characteristic from a conveyor or crusher.
For this reason, the same drive can have different usable motor-power ratings depending on the application duty.
7. 400 kW Normal-Duty Rating
The 400 kW normal-duty rating is a particularly important figure when selecting this drive for general industrial equipment.
It provides a substantial motor-power range while retaining a robust industrial drive architecture.
Typical applications can include:
- Large pumps.
- Large fans.
- Process blowers.
- Water-treatment equipment.
- Industrial ventilation.
- Process machinery.
- Material-handling systems with moderate torque requirements.
The motor’s nameplate current should always be checked rather than selecting the drive only by motor kW.
8. 355 kW Heavy-Duty Rating
The 355 kW heavy-duty rating is important for applications where higher torque and overload requirements exist.
Typical examples include:
- Heavy conveyors.
- Crushers.
- Mixers.
- Material-handling machinery.
- Certain hoisting-related systems.
- Heavy process equipment.
- Large mechanical loads requiring frequent acceleration.
Heavy-duty operation generally places greater demands on the drive’s power components because the motor may need to produce higher torque for longer periods.
Therefore, the 355 kW heavy-duty rating should be treated as a meaningful engineering limit rather than simply another nominal motor-power figure.
9. AC Input with Precharge
The 20G1ALC770AN2NNNNN uses an AC input with precharge.
Precharge is particularly important in high-power drive systems because the DC bus contains substantial energy-storage components.
When the drive is initially energized, the precharge circuit helps control the initial charging process rather than allowing the DC bus capacitors to experience an uncontrolled charging current.
This is especially relevant at the 770 A power level.
The input configuration is designed for an industrial three-phase AC power system.
10. No DC Terminals
This configuration is specified without external DC terminals.
The drive is therefore intended to be supplied through its AC input configuration rather than being used as part of a common external DC-bus arrangement through dedicated external DC terminals.
This distinction can become important when comparing different PowerFlex 755 configurations.
For a replacement project, engineers should therefore compare the complete catalog number and not simply select another 770 A drive.
11. Type 1 / IP20 Enclosure
The specified enclosure arrangement is Type 1 / IP20.
This configuration is primarily intended for protected indoor industrial installations.
It is not a weatherproof or washdown enclosure.
Typical installation environments include:
- Electrical rooms.
- MCC rooms.
- Industrial control rooms.
- Protected machinery rooms.
- Indoor process facilities.
- Electrical cabinets.
The installation environment should be kept within the applicable temperature, humidity, contamination, and airflow requirements.
If the drive must be installed in an area with water spray, aggressive contaminants, or outdoor exposure, a different enclosure arrangement may be more appropriate.
12. 800 mm Deep MCC-Style Construction
The 800 mm deep MCC-style configuration is designed for integration into large industrial electrical systems.
This is significantly different from a compact wall-mounted inverter.
The installation must allow sufficient room for:
- Power cables.
- Control cables.
- Communication cables.
- Cable bending radius.
- Ventilation.
- Heat dissipation.
- Maintenance.
- Component replacement.
- Electrical isolation.
- Service access.
The 800 mm figure should therefore not be interpreted as the total required installation footprint.
Additional clearance may be required around the drive depending on the cabinet arrangement and local installation standards.
13. Enhanced LCD Full Numeric Handheld/Local HIM
One of the most useful characteristics of the 20G1ALC770AN2NNNNN is its Enhanced LCD, Full Numeric, Handheld/Local HIM configuration.
HIM stands for Human Interface Module.
The local interface provides technicians with a convenient way to interact with the drive directly.
Typical functions can include:
- Parameter setup.
- Status monitoring.
- Fault identification.
- Alarm monitoring.
- Local configuration.
- Drive diagnostics.
- Operating-value display.
- Commissioning support.
For a large industrial drive, local access can be particularly useful during commissioning.
A technician does not always need to connect through the plant control system simply to inspect a drive parameter or identify a fault.
14. Advantages of the Local HIM
The local HIM can be particularly useful during maintenance and commissioning.
For example, if a motor refuses to start, a technician can use the local interface to inspect drive status and fault information.
During commissioning, the operator can also verify:
- Output frequency.
- Motor current.
- Drive status.
- Command status.
- Fault conditions.
- Parameter settings.
This can reduce the amount of time required to identify simple configuration problems.
The local HIM is therefore a practical difference between this model and an otherwise similar no-HIM configuration.
15. Embedded EtherNet/IP
The embedded EtherNet/IP capability allows the drive to become part of an industrial automation network.
This is useful in applications where the motor must be controlled by a PLC or supervisory automation system.
Typical information exchanged over the network can include:
- Start commands.
- Stop commands.
- Speed references.
- Status information.
- Fault information.
- Warning information.
- Output current.
- Motor speed.
- Drive operating state.
- Diagnostic information.
This makes the drive suitable for modern automated production systems.
16. Basic Operating Principle
The basic operating process is:
Three-phase AC input → controlled power conversion → DC bus → inverter switching → variable-frequency AC output → motor
The drive changes the electrical frequency and voltage supplied to the motor.
This allows the motor to operate at a controlled speed rather than being limited to a fixed line-frequency operating point.
For industrial machinery, this can provide smoother acceleration, adjustable speed, controlled deceleration, and better process matching.
17. Motor Speed Control
The drive can be used to regulate motor speed according to process requirements.
For example, a pump may not need to run at maximum speed throughout the entire day.
If the required flow is lower, the motor speed can be reduced.
Likewise, a fan can operate at a lower speed when the ventilation requirement is reduced.
A conveyor can accelerate gradually instead of immediately applying full operating speed.
This type of control can improve both process behavior and mechanical operation.
18. Product Applications
Large Pump Systems
The 20G1ALC770AN2NNNNN is well suited to large pump installations.
Potential applications include:
- Raw-water pumps.
- Process-water pumps.
- Cooling-water pumps.
- Wastewater pumps.
- Irrigation pumps.
- Industrial circulation pumps.
- Large utility pumps.
Variable-speed control allows the pump to respond to changing flow and pressure requirements.
19. Water and Wastewater Applications
Water and wastewater facilities often contain large motors.
The drive can be applied to:
- Intake pumps.
- Transfer pumps.
- Lift pumps.
- Sludge systems.
- Aeration blowers.
- Process-water systems.
- Large ventilation equipment.
The ability to connect the drive to an automation network is useful because water-treatment facilities often require centralized monitoring and automatic process control.
20. Fan Applications
Large industrial fans can be significant electrical loads.
Potential applications include:
- Furnace fans.
- Cooling fans.
- Exhaust systems.
- Industrial ventilation.
- Air-handling equipment.
- Process ventilation.
Variable-speed operation allows fan output to be matched to actual demand.
This can also reduce unnecessary mechanical stress associated with constant full-speed operation.
21. Blower Applications
Large blowers can require considerable motor power.
Typical applications include:
- Aeration.
- Pneumatic conveying.
- Process air.
- Combustion air.
- Industrial ventilation.
- Wastewater treatment.
The 770 A drive rating gives substantial capacity for large blower motors.
22. Conveyor Applications
Conveyors are another important application category.
Large conveyors can have substantial inertia and may carry heavy loads.
Controlled acceleration can reduce mechanical shock.
The drive can be used for:
- Mining conveyors.
- Cement conveyors.
- Aggregate conveyors.
- Bulk-material conveyors.
- Production conveyors.
- Port and material-handling systems.
The heavy-duty rating should be carefully evaluated when the conveyor requires high starting torque.
23. Mining Applications
Mining equipment can require very large motors.
Potential applications include:
- Long conveyors.
- Mine ventilation.
- Dewatering pumps.
- Material handling.
- Crushers.
- Large fans.
- Processing equipment.
The PowerFlex 755 platform is suited to large industrial motor systems where the drive must communicate with a larger control architecture.
24. Cement Industry Applications
Cement and building-material plants use large motors throughout the production process.
Possible applications include:
- Conveyor systems.
- Process fans.
- Exhaust fans.
- Blowers.
- Pumps.
- Material handling.
- Grinding-related auxiliary equipment.
The drive’s high current capacity makes it suitable for large motor applications within these plants when the electrical and mechanical requirements are correctly matched.
25. Pulp and Paper Applications
Pulp and paper facilities often contain many variable-speed motors.
Potential applications include:
- Pumps.
- Fans.
- Blowers.
- Roll drives.
- Process equipment.
- Material-handling equipment.
A networked drive architecture can simplify centralized monitoring of multiple motor systems.
26. Chemical and Process Industry Applications
Large pumps, fans, and process machines are common in chemical and process plants.
The drive can be used where variable-speed operation is required.
However, the environmental classification of the installation must always be considered.
If the installation is located in a hazardous or corrosive environment, the complete system must be evaluated for the required protection level.
27. Main Product Advantages
High Current Capacity
The 770 A rating provides substantial electrical capacity for large industrial motors.
High Motor-Power Capability
The 450 kW light-duty rating and 400 kW normal-duty rating make this a high-capacity drive for industrial machinery.
Heavy-Duty Capability
The 355 kW heavy-duty rating provides a useful operating range for more demanding torque applications.
Local Operator Interface
The Enhanced LCD Full Numeric Handheld/Local HIM provides direct access to the drive.
Embedded EtherNet/IP
The drive can be integrated into an industrial automation network without treating the drive as an isolated component.
Forced-Air Cooling
Forced-air cooling is appropriate for high-power drive operation when the installation provides adequate ventilation.
MCC Integration
The 800 mm deep MCC-style architecture makes it suitable for large centralized electrical installations.
Broad Application Range
The same drive platform can be used across water, manufacturing, mining, cement, process, material-handling, pump, fan, and blower applications.
28. Cooling and Thermal Management
A 770 A drive generates substantial heat during operation.
The forced-air cooling system is therefore an essential part of the installation.
The following areas should be inspected regularly:
- Cooling fans.
- Air passages.
- Cabinet ventilation.
- Air filters.
- Dust accumulation.
- Ambient temperature.
- Exhaust airflow.
A blocked ventilation path can increase internal temperature.
High temperatures can accelerate component aging and may eventually lead to thermal protection or drive derating.
For this reason, thermal management should be treated as part of the electrical design rather than an afterthought.
29. Approximate Dimensions and Weight
The exact dimensions and weight of a large Frame 8 drive can depend on the complete mechanical arrangement.
For preliminary engineering, cabinet planning, quotation work, and transportation estimation, the following values can be used as practical reference figures.
| Mechanical Parameter | Approximate Specification |
|---|---|
| Model | 20G1ALC770AN2NNNNN |
| Frame | Frame 8 |
| MCC Depth | 800 mm |
| Approx. Width | 600 mm |
| Approx. Height | 2,000–2,400 mm |
| Approx. Overall Depth | 800 mm |
| Approx. Weight | 500–650 kg |
| Cooling | Forced Air |
| Mounting Style | MCC / Floor-Standing Industrial |
| Service Clearance | Additional space required |
The above physical values should be considered planning figures rather than certified final mechanical dimensions.
For lifting equipment, shipping arrangements, foundation calculations, cabinet fabrication, and installation clearances, the final mechanical drawing associated with the supplied configuration should be used.
30. Recommended Related Models
The following five models are useful comparisons because they belong to the same PowerFlex 755 family or are closely related configurations.
| Model | Voltage | Current | LD Rating | ND Rating | HD Rating | Frame | HIM / Configuration |
|---|---|---|---|---|---|---|---|
| 20G1ALC650AN0NNNNN | 400 VAC | 650 A | 400 kW | 355 kW | 315 kW | 8 | No HIM |
| 20G1ALC750AN0NNNNN | 400 VAC | 750 A | 450 kW | 400 kW | 315 kW | 8 | No HIM |
| 20G1ALC770AN0NNNNN | 400 VAC | 770 A | 450 kW | 400 kW | 355 kW | 8 | No HIM |
| 20G1ALC770JN0NNNNN | 400 VAC | 770 A | 450 kW | 400 kW | 355 kW | 8 | No HIM configuration |
| 20G1ALC770JN2NNNNN | 400 VAC | 770 A | 450 kW | 400 kW | 355 kW | 8 | Handheld/Local HIM |
31. Related Model — 20G1ALC650AN0NNNNN
The 20G1ALC650AN0NNNNN is a lower-current PowerFlex 755 configuration.
Its 650 A rating makes it suitable for applications that do not require the full capacity of the 770 A model.
| Parameter | Specification |
|---|---|
| Model | 20G1ALC650AN0NNNNN |
| Series | PowerFlex 755 |
| Voltage | 400 VAC |
| Current | 650 A |
| Light Duty | 400 kW |
| Normal Duty | 355 kW |
| Heavy Duty | 315 kW |
| Frame | 8 |
| Cooling | Forced Air |
| Enclosure | Type 1 / IP20 |
| Installation | 800 mm MCC Style |
| Communication | Embedded EtherNet/IP |
| Approx. Depth | 800 mm |
| Approx. Weight | 450–600 kg |
This model can be considered when the motor’s actual current requirement is comfortably below the 770 A capacity.
32. Related Model — 20G1ALC750AN0NNNNN
The 750 A configuration is electrically close to the 770 A version.
| Parameter | Specification |
|---|---|
| Model | 20G1ALC750AN0NNNNN |
| Series | PowerFlex 755 |
| Voltage | 400 VAC |
| Current | 750 A |
| Light Duty | 450 kW |
| Normal Duty | 400 kW |
| Heavy Duty | 315 kW |
| Frame | 8 |
| Cooling | Forced Air |
| Enclosure | Type 1 / IP20 |
| Installation | 800 mm MCC Style |
| Communication | Embedded EtherNet/IP |
| HIM | Blank / No HIM |
| Approx. Depth | 800 mm |
| Approx. Weight | 500–650 kg |
The primary electrical difference is the lower current capacity compared with the 770 A configuration.
33. Related Model — 20G1ALC770AN0NNNNN
This is the closest configuration to the requested model.
The main difference is the HIM arrangement.
| Parameter | Specification |
|---|---|
| Model | 20G1ALC770AN0NNNNN |
| Voltage | 400 VAC |
| Current | 770 A |
| Light Duty | 450 kW |
| Normal Duty | 400 kW |
| Heavy Duty | 355 kW |
| Frame | 8 |
| Cooling | Forced Air |
| Enclosure | Type 1 / IP20 |
| Installation | 800 mm MCC Style |
| Communication | Embedded EtherNet/IP |
| HIM | Blank / No HIM |
| Dynamic Braking | None |
| Approx. Depth | 800 mm |
| Approx. Weight | 500–650 kg |
The requested AN2 configuration provides a local/handheld HIM, while the AN0 configuration is the no-HIM version.
34. Related Model — 20G1ALC770JN0NNNNN
The 20G1ALC770JN0NNNNN is another closely related 770 A PowerFlex 755 configuration.
| Parameter | Specification |
|---|---|
| Model | 20G1ALC770JN0NNNNN |
| Voltage | 400 VAC |
| Current | 770 A |
| Light Duty | 450 kW |
| Normal Duty | 400 kW |
| Heavy Duty | 355 kW |
| Frame | 8 |
| Cooling | Forced Air |
| Enclosure | Type 1 / IP20 |
| Installation | 800 mm MCC Style |
| Communication | Embedded EtherNet/IP |
| EMC | Filtered |
| Dynamic Braking | None |
| Approx. Depth | 800 mm |
| Approx. Weight | 500–650 kg |
This model is particularly useful for comparing catalog configurations that share the same basic electrical rating.
35. Related Model — 20G1ALC770JN4NNNNN
The 20G1ALC770JN4NNNNN is another closely related model with the same basic 400 VAC, 770 A, Frame 8 electrical platform.
Its configuration includes an Enhanced LCD, Full Numeric, IP66 NEMA Type 4X/12 HIM.
| Parameter | Specification |
|---|---|
| Model | 20G1ALC770JN4NNNNN |
| Voltage | 400 VAC |
| Current | 770 A |
| Light Duty | 450 kW |
| Normal Duty | 400 kW |
| Heavy Duty | 355 kW |
| Frame | 8 |
| Cooling | Forced Air |
| Enclosure | Type 1 / IP20 |
| Installation | 800 mm MCC Style |
| Communication | Embedded EtherNet/IP |
| HIM | Enhanced LCD, Full Numeric, IP66 NEMA Type 4X/12 |
| Dynamic Braking | None |
| Approx. Depth | 800 mm |
| Approx. Weight | 500–650 kg |
This model can be attractive where the local operator interface requires additional enclosure protection.
36. Five Same-Brand Popular Models
The following five models represent other widely used Allen-Bradley PowerFlex drive families and provide a useful comparison with the large PowerFlex 755.
| Model | Series | Voltage Class | Drive Size | Typical Application | Cooling / Construction |
|---|---|---|---|---|---|
| 25B-D010N104 | PowerFlex 525 | 480 VAC class | Compact | General machine control | Compact industrial drive |
| 25C-D010N103 | PowerFlex 527 | 480 VAC class | Compact | Machine automation | Compact industrial drive |
| 20F11NC2P1JA0NNNNN | PowerFlex 753 | 480 VAC class | Medium/Large | Industrial machinery | Industrial AC drive |
| 20F11NC8P0JA0NNNNN | PowerFlex 753 | 480 VAC class | Medium/Large | Process and machine control | Industrial AC drive |
| 20G1ALC770AN2NNNNN | PowerFlex 755 | 400 VAC | Large / Frame 8 | Large industrial motors | Forced-air MCC style |
These five models are not direct electrical replacements for the 20G1ALC770AN2NNNNN.
They represent different sections of the PowerFlex product range and therefore cover different motor sizes and application requirements.
37. PowerFlex 525 Comparison
The PowerFlex 525 is designed for substantially smaller applications than the 770 A PowerFlex 755.
| Parameter | 25B-D010N104 | 20G1ALC770AN2NNNNN |
|---|---|---|
| Series | PowerFlex 525 | PowerFlex 755 |
| General Application | Small/Medium Machines | Large Industrial Systems |
| Voltage Class | 480 VAC class | 400 VAC |
| Current Class | Low | 770 A |
| Installation | Compact | 800 mm MCC Style |
| Frame | Compact | Frame 8 |
| Cooling | Compact | Forced Air |
| Local Interface | Configuration dependent | Enhanced LCD Full Numeric HIM |
| Network Integration | Available | Embedded EtherNet/IP |
| Motor Application | Small/Medium | Large |
| Approx. Weight | Low | 500–650 kg |
The PowerFlex 525 is therefore better suited to compact machinery, while the 20G1ALC770AN2NNNNN is intended for large industrial motors.
38. PowerFlex 527 Comparison
The PowerFlex 527 is another compact industrial drive family.
| Parameter | 25C-D010N103 | 20G1ALC770AN2NNNNN |
|---|---|---|
| Series | PowerFlex 527 | PowerFlex 755 |
| Application | Machine Automation | Large Industrial Motor Control |
| Voltage Class | 480 VAC class | 400 VAC |
| Current Range | Compact-drive class | 770 A |
| Construction | Compact | Frame 8 |
| Installation | Machine Cabinet | MCC Style |
| Cooling | Compact | Forced Air |
| Communication | Industrial Network | Embedded EtherNet/IP |
| HIM | Configuration dependent | Enhanced LCD Full Numeric |
| Approx. Weight | Low | 500–650 kg |
These two models serve very different application scales.
39. PowerFlex 753 Comparison
The PowerFlex 753 family is a closer comparison because it is also intended for industrial applications.
| Parameter | 20F11NC2P1JA0NNNNN | 20F11NC8P0JA0NNNNN |
|---|---|---|
| Series | PowerFlex 753 | PowerFlex 753 |
| Product Type | Industrial AC Drive | Industrial AC Drive |
| Application | Pumps, Fans, Machinery | Process and Industrial Machinery |
| Voltage Class | 480 VAC class | 480 VAC class |
| Drive Size | Medium/Large | Medium/Large |
| Network Integration | Available | Available |
| Local Interface | Configuration dependent | Configuration dependent |
| Intended Scale | Industrial | Industrial |
The PowerFlex 753 family provides an alternative industrial-drive platform, while the PowerFlex 755 is particularly suitable for larger and more demanding applications.
40. Detailed Model Comparison
| Model | Voltage | Current | LD | ND | HD | Frame | HIM | Depth | Approx. Weight |
|---|---|---|---|---|---|---|---|---|---|
| 20G1ALC650AN0NNNNN | 400 VAC | 650 A | 400 kW | 355 kW | 315 kW | 8 | No HIM | 800 mm | 450–600 kg |
| 20G1ALC750AN0NNNNN | 400 VAC | 750 A | 450 kW | 400 kW | 315 kW | 8 | No HIM | 800 mm | 500–650 kg |
| 20G1ALC770AN0NNNNN | 400 VAC | 770 A | 450 kW | 400 kW | 355 kW | 8 | No HIM | 800 mm | 500–650 kg |
| 20G1ALC770AN2NNNNN | 400 VAC | 770 A | 450 kW | 400 kW | 355 kW | 8 | Local HIM | 800 mm | 500–650 kg |
| 20G1ALC770JN0NNNNN | 400 VAC | 770 A | 450 kW | 400 kW | 355 kW | 8 | Configuration dependent | 800 mm | 500–650 kg |
| 20G1ALC770JN2NNNNN | 400 VAC | 770 A | 450 kW | 400 kW | 355 kW | 8 | Local HIM | 800 mm | 500–650 kg |
| 20G1ALC770JN4NNNNN | 400 VAC | 770 A | 450 kW | 400 kW | 355 kW | 8 | Protected HIM | 800 mm | 500–650 kg |
41. Local Control and Remote Control
The 20G1ALC770AN2NNNNN can be incorporated into systems that combine local operator access with remote automation.
Local operation can be useful during:
- Commissioning.
- Maintenance.
- Troubleshooting.
- Parameter verification.
- Equipment inspection.
Remote control is useful during:
- Normal production.
- Automated process control.
- Centralized monitoring.
- SCADA operation.
- PLC-controlled sequences.
This combination provides a practical balance between technician access and automated plant operation.
42. Commissioning Advantages
During commissioning, the local HIM can make the process more straightforward.
A technician can inspect the drive directly rather than relying exclusively on a remote HMI.
Typical commissioning tasks include:
- Confirming motor nameplate data.
- Checking control configuration.
- Verifying input power.
- Confirming motor rotation.
- Checking acceleration and deceleration behavior.
- Verifying network communication.
- Monitoring output current.
- Checking drive fault status.
- Confirming the operating speed reference.
- Testing the machine under controlled conditions.
The local interface is particularly useful during these procedures.
43. Maintenance Advantages
A large drive can be expensive to troubleshoot if diagnostic information is not readily available.
The local HIM provides technicians with direct access to operating information.
This can simplify fault identification.
For example, a technician can determine whether a problem is associated with:
- The drive itself.
- The motor.
- The command source.
- The network.
- The process.
- An external interlock.
- An overload condition.
This does not eliminate the need for proper electrical troubleshooting, but it provides useful information during the process.
44. Installation Requirements
Because the 20G1ALC770AN2NNNNN is a large high-current drive, installation planning should cover both electrical and mechanical requirements.
Important areas include:
Electrical Power
The incoming power system must be capable of supporting the drive and motor load.
Protection
Upstream protection and coordination must be designed appropriately.
Cabling
Input and motor conductors must be correctly sized.
Grounding
A suitable grounding arrangement is required.
Ventilation
The forced-air cooling system needs an adequate airflow path.
Mechanical Support
The equipment must be installed on an appropriate structure capable of supporting its weight.
Service Access
Technicians need adequate access to power connections, control connections, cooling components, and the HIM.
45. Cable Installation
The 770 A current class means that power cables can be physically large.
The installation must consider:
- Cable size.
- Number of conductors.
- Cable bending radius.
- Terminal arrangement.
- Cable routing.
- Separation between power and control wiring.
- Grounding conductors.
- EMC considerations.
- Heat accumulation.
This is one reason the large MCC-style construction is important.
The drive itself is only one part of the overall installation footprint.
46. Grounding and EMC
The filtered configuration and CM-jumper arrangement should be considered during system installation.
Correct grounding is important for:
- Personnel safety.
- Drive operation.
- Communication reliability.
- Electromagnetic compatibility.
- Noise control.
- Fault-current management.
The grounding system should be designed according to the electrical installation requirements and applicable standards.
47. Dynamic Braking
The specified configuration does not include dynamic braking.
This is important for applications where the motor must decelerate rapidly or where a high-inertia load must be stopped frequently.
Applications requiring substantial braking capability should be evaluated separately.
Examples may include:
- High-inertia machinery.
- Rapid conveyor stopping.
- Certain material-handling systems.
- Repetitive acceleration and deceleration.
- Machinery with significant regenerative energy.
If braking is a major part of the application, the drive configuration should be reviewed before purchase.
48. Selecting the Correct Replacement
When replacing another PowerFlex 755 drive, engineers should compare the complete catalog number.
At minimum, verify:
| Selection Item | Required Check |
|---|---|
| Voltage | 400 VAC |
| Current | 770 A |
| Duty | LD / ND / HD |
| Frame | Frame 8 |
| Enclosure | Type 1 / IP20 |
| Installation | 800 mm MCC style |
| Cooling | Forced Air |
| Input | AC with Precharge |
| DC Terminals | None |
| HIM | Enhanced LCD Full Numeric Local/Handheld |
| Communication | Embedded EtherNet/IP |
| EMC | Filtered |
| CM Jumper | Configuration dependent |
| Dynamic Braking | None |
| Physical Dimensions | Confirm final drawing |
| Weight | Confirm final configuration |
| Motor | Confirm nameplate current and power |
| Application | Confirm torque profile |
Matching only the model family is not enough for a safe replacement.
49. Product Selection Checklist
Before specifying the 20G1ALC770AN2NNNNN, the following information should be confirmed:
Motor voltage: The motor must be compatible with the drive output voltage class.
Motor current: The motor full-load current must be within the selected drive rating.
Motor power: The motor kW rating must match the selected duty category.
Load type: Determine whether the load is centrifugal, constant torque, high inertia, or another characteristic.
Acceleration: Determine whether the motor requires normal or high starting torque.
Braking: Determine whether regenerative or dynamic braking is required.
Environment: Confirm temperature, humidity, contamination, and enclosure requirements.
Communication: Confirm whether EtherNet/IP is required.
Local operation: Confirm whether the local HIM is needed.
Mechanical space: Confirm cabinet width, height, depth, cable routing, and service clearance.
Weight: Confirm the actual supplied equipment weight for transportation and lifting.
50. Main Advantages at a Glance
| Advantage | Description |
|---|---|
| High Current | 770 A output-current class |
| High Power | Up to 450 kW light-duty rating |
| Normal Duty | 400 kW |
| Heavy Duty | 355 kW |
| Large Frame | Frame 8 |
| Industrial Cooling | Forced Air |
| Networked Control | Embedded EtherNet/IP |
| Local Operation | Enhanced LCD Full Numeric HIM |
| MCC Integration | 800 mm deep MCC-style construction |
| Industrial Applications | Pumps, fans, blowers, conveyors, process equipment |
| Flexible Control | Variable-speed motor control |
| Commissioning | Local parameter access |
| Maintenance | Local diagnostic access |
| EMC | Filtered configuration |
| Input | AC input with precharge |
51. Final Technical Specification Table
| Category | Specification |
|---|---|
| Model | 20G1ALC770AN2NNNNN |
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Product | High-Power AC Drive |
| Input Voltage | 400 VAC |
| Input Phase | Three Phase |
| Rated Current | 770 A |
| Light-Duty Power | 450 kW |
| Normal-Duty Power | 400 kW |
| Heavy-Duty Power | 355 kW |
| Frame | 8 |
| Cooling | Forced Air |
| Input Type | AC Input with Precharge |
| DC Terminals | None |
| Enclosure | Type 1 / IP20 |
| Installation | 800 mm Deep MCC Style |
| EMC | Filtered |
| CM Jumper | Removed |
| Dynamic Braking | None |
| Communication | Embedded EtherNet/IP |
| HIM | Enhanced LCD, Full Numeric, Handheld/Local HIM |
| Approx. Width | 600 mm |
| Approx. Height | 2,000–2,400 mm |
| Approx. Depth | 800 mm |
| Approx. Weight | 500–650 kg |
| Typical Motor Application | Large Industrial Motors |
| Main Applications | Pumps, Fans, Blowers, Conveyors, Water Treatment, Mining, Cement, Process Equipment |
| Installation Type | Indoor Industrial / MCC |
| Main Benefit | High-capacity variable-speed motor control with local and networked operation |
52. Overall Product Assessment
The Allen-Bradley 20G1ALC770AN2NNNNN is a large-frame industrial AC drive designed around a 770 A, 400 VAC three-phase electrical platform.
Its 450 kW light-duty, 400 kW normal-duty, and 355 kW heavy-duty ratings provide flexibility for different industrial load profiles.
The Frame 8 construction and 800 mm deep MCC-style arrangement make it appropriate for centralized industrial electrical installations rather than compact machine cabinets.
The embedded EtherNet/IP interface allows the drive to communicate with a larger automation system, while the Enhanced LCD Full Numeric Handheld/Local HIM gives maintenance and commissioning personnel direct access to the drive.
This combination is particularly useful in plants where large motors need both centralized automatic control and convenient local servicing.
The forced-air cooling system is suitable for the high-power architecture, but adequate cabinet ventilation and routine maintenance are essential.
The 20G1ALC770AN2NNNNN is particularly well suited to large pumps, fans, blowers, conveyors, water and wastewater equipment, mining systems, cement equipment, and other process machinery.
For heavy mechanical loads, the 355 kW heavy-duty rating should receive particular attention.
For centrifugal pumps and fans with comparatively smooth torque characteristics, the 450 kW light-duty rating may be applicable when the motor current and actual operating conditions remain within the specified limits.
53. Final Summary
The Allen-Bradley 20G1ALC770AN2NNNNN belongs to the PowerFlex 755 series and represents a high-capacity 400 VAC Frame 8 industrial AC drive.
Its main electrical characteristics are:
400 VAC, three phase
770 A current class
450 kW light duty
400 kW normal duty
355 kW heavy duty
Frame 8
Forced-air cooling
800 mm deep MCC-style construction
Type 1 / IP20
Embedded EtherNet/IP
AC input with precharge
No external DC terminals
Filtered EMC configuration
No dynamic braking
Enhanced LCD Full Numeric Handheld/Local HIM
The local HIM is one of the practical advantages of this particular configuration. It allows technicians to work directly with the drive during commissioning, maintenance, parameter checking, and troubleshooting.
The drive’s large current capacity makes it appropriate for large industrial motors, while its network capability allows it to participate in centralized automation systems.
For preliminary mechanical planning, an approximately 600 mm width, 2,000–2,400 mm height, 800 mm depth, and 500–650 kg weight can be used as practical reference values. The final mechanical drawing and supplied configuration should be used for actual cabinet fabrication, transportation, lifting, and installation calculations.
Overall, the 20G1ALC770AN2NNNNN is a high-power industrial variable-frequency drive configuration intended for large and demanding motor applications where high current capacity, substantial motor-power capability, local operator access, networked control, and MCC-style installation are important.