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Allen-Bradley 20G1F3C920LNDNNNNN PowerFlex 755 AC Drive
1. Product Introduction
The Allen-Bradley 20G1F3C920LNDNNNNN is a high-power AC variable frequency drive belonging to the PowerFlex 755 family. It is an air-cooled, floor-mounted PowerFlex 755 packaged drive designed for demanding industrial motor-control applications where high current capacity, stable speed control, controlled acceleration and deceleration, and integration with industrial automation systems are required.
The catalog number is associated with a 920 A, 400 V-class PowerFlex 755 configuration. Available product information identifies the unit as an air-cooled PowerFlex 755 AC packaged drive with an AFE regenerative input arrangement, Type 1/IP21 enclosure arrangement, floor-mounted construction, and Frame 9B configuration.
The 920 A rating places this model in the large-drive category. It is intended for applications considerably larger than ordinary machine drives, including large conveyors, crushers, pumps, fans, compressors, process machinery, mining equipment, material-handling systems, and other high-power industrial installations.
The PowerFlex 755 architecture was designed around modularity and application flexibility. For a large installation, this is important because the drive is normally treated as part of a complete motor-control system rather than simply as a standalone inverter.
2. Brand
| Item | Information |
|---|---|
| Brand | Allen-Bradley |
| Product Family | PowerFlex |
| Product Series | PowerFlex 755 |
| Product Type | AC Variable Frequency Drive |
| Drive Classification | High-Power Industrial AC Drive |
| Cooling | Air Cooled |
| Installation | Floor Mount |
| Current Class | 920 A |
| Voltage Class | 400 V AC |
| Phase | Three Phase |
| Frame | Frame 9 / Frame 9B configuration |
| Enclosure / Mounting Style | Type 1 / IP21 packaged-drive configuration |
| Input Arrangement | AFE Regenerative |
| Main Function | Variable-speed control of large AC motors |
The exact catalog number is 20G1F3C920LNDNNNNN. It should be treated as a complete configuration identifier rather than assuming that every PowerFlex 755 with the same current rating has exactly the same options or mechanical arrangement.
3. Product Series
The product belongs to the PowerFlex 755 series.
The PowerFlex 755 series is a high-performance industrial drive platform intended for medium- and high-power AC motor applications. The series covers a broad range of current and power ratings and includes different enclosure, input, feedback, braking, filtering, and application configurations.
The 920 A class is one of the larger configurations in the PowerFlex 755 platform. Other catalog numbers in the same family include 750 A, 770 A, 920 A, 1.0 kA-class, 1.1 kA-class and larger configurations. Catalog listings specifically identify 20G1F3C920LNDNNNNN as a PowerFlex 755 AC packaged drive.
The series is particularly appropriate when a conventional small or medium-size VFD is no longer sufficient for the motor power, mechanical load, or required control performance.
4. Basic Product Parameters
| Parameter | Specification |
|---|---|
| Model | 20G1F3C920LNDNNNNN |
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Product Type | AC Packaged Drive |
| Drive Construction | Air Cooled |
| Input Type | AFE Regenerative |
| Rated Current | 920 A |
| Supply Voltage Class | 400 V AC |
| Supply Phase | 3 Phase |
| Nominal Motor-Control Class | Approximately 500 kW normal-duty class |
| Heavy-Duty Rating | Approximately 400 kW |
| Mounting | Floor Mount |
| Enclosure | Type 1 / IP21 class |
| Frame | Frame 9B |
| Dynamic Braking | None in the identified configuration |
| EMC Filter | No EMC in the identified configuration |
| Application Category | High-Power Industrial Motor Control |
| Dimensions | Approximately 2453 H × 1200 W × 600 or 800 D mm, depending on cabinet arrangement |
| Weight | Approximately 1246 kg for the IP20 Frame 9 cabinet configuration |
| Cooling | Forced Air Cooling |
The 920 A / 500 kW normal-duty and 400 kW heavy-duty values are associated with the identified configuration listing.
For large Frame 9 PowerFlex 755 cabinets, published dimensional data gives approximately 2453 mm overall height for the IP20/NEMA Type 1 cabinet arrangement, with 1200 mm width and either 600 mm or 800 mm depth depending on configuration. Approximate Frame 9 weight is 1246 kg.
Because packaged drives can include different cabinet bays, filters, line equipment, option sections, and enclosure arrangements, the exact shipping dimensions and final installed weight should always be checked against the mechanical drawing for the complete catalog number.
5. Electrical Specifications
| Electrical Parameter | Specification |
|---|---|
| Model | 20G1F3C920LNDNNNNN |
| Input Voltage Class | 400 V AC |
| Input Phase | Three Phase |
| Rated Current | 920 A |
| Drive Type | AC Variable Frequency Drive |
| Input Configuration | AFE Regenerative |
| Motor Output | Variable-frequency AC output |
| Normal-Duty Power Class | Approximately 500 kW |
| Heavy-Duty Power Class | Approximately 400 kW |
| Frequency Control | Variable Frequency |
| Motor Speed Control | Variable-Speed Operation |
| Dynamic Braking | None in identified configuration |
| EMC Option | No EMC in identified configuration |
| Cooling | Air Cooled |
| Frame | Frame 9B |
| Installation | Floor Mounted |
The large current rating is particularly important when selecting this drive. A 920 A drive is not normally selected simply by matching motor horsepower; the engineer must also consider motor voltage, motor full-load current, duty cycle, overload requirements, acceleration requirements, ambient conditions, altitude, cooling conditions, and the actual mechanical load.
6. Power Rating
The 920 A configuration belongs to the approximately 500 kW normal-duty class.
For applications requiring more frequent overload operation, acceleration torque, or higher continuous mechanical stress, the approximately 400 kW heavy-duty class is the more relevant reference point.
| Duty Classification | Approximate Rating |
|---|---|
| Model | 20G1F3C920LNDNNNNN |
| Current | 920 A |
| Normal-Duty Power Class | Approximately 500 kW |
| Heavy-Duty Power Class | Approximately 400 kW |
| Voltage Class | 400 V AC |
| Frame | Frame 9B |
| Cooling | Air Cooled |
The 500 kW normal-duty and 400 kW heavy-duty values are specifically identified for the 920 A configuration in available product information.
For engineering selection, these values should not be treated as a substitute for the motor nameplate current. The actual motor current and application duty should always be compared against the drive’s published rating tables.
7. AFE Regenerative Input
One of the significant characteristics associated with this configuration is the AFE regenerative input.
AFE means Active Front End. In applications using regenerative operation, electrical energy produced by a decelerating motor or an overhauling mechanical load can be transferred back toward the electrical supply rather than being handled only through conventional dynamic-braking resistors.
This can be valuable in systems where the motor frequently changes speed, where a load can drive the motor, or where large amounts of mechanical energy must be controlled during deceleration.
Typical examples include downhill conveyors, hoisting systems, high-inertia machinery, test equipment, large centrifuges, and certain material-handling systems.
The exact regeneration behavior depends on the complete drive configuration and system design. Regenerative operation also requires appropriate consideration of line protection, harmonics, grounding, power quality, control strategy, and electrical-system compatibility.
8. Product Construction
The 20G1F3C920LNDNNNNN is a large industrial floor-mounted drive rather than a small wall-mounted VFD.
Its physical construction is intended for industrial electrical rooms, drive rooms, motor-control areas, process buildings, and similar facilities where a substantial amount of floor space is available.
At this power level, mechanical design becomes an important part of installation planning. Cable entry, bus connections, ventilation, cabinet access, lifting points, maintenance clearances, and heat dissipation all need to be considered before installation.
The Frame 9 PowerFlex 755 mechanical architecture is considerably larger than the smaller PowerFlex 755 frames. Published dimensional information for Frame 9 cabinets indicates approximately 2453 mm height for the IP20/NEMA Type 1 arrangement.
9. Dimensions and Weight
Large PowerFlex 755 drives are available in different cabinet arrangements, so dimensions are best understood as configuration-level specifications rather than a single universal measurement for every Frame 9 product.
| Mechanical Parameter | IP20 / NEMA Type 1 Frame 9 Reference |
|---|---|
| Model | 20G1F3C920LNDNNNNN |
| Frame | 9 |
| Approx. Height | 2453 mm |
| Approx. Width | 1200 mm |
| Approx. Depth | 600 or 800 mm |
| Approx. Weight | 1246 kg |
| Installation | Floor Mount |
| Cabinet Style | MCC / Floor-Mount Style |
| Cooling | Air Cooled |
| Service Access | Front and cabinet-specific service clearance |
| Shipping Weight | Configuration dependent |
| Exact Mechanical Dimensions | Verify final mechanical drawing |
Published PowerFlex 755 selection data gives Frame 9 IP20 cabinet dimensions of approximately 2453 × 1200 × 600/800 mm and an approximate weight of 1246 kg.
These figures should be regarded as cabinet-level reference dimensions. A complete packaged system with additional option cabinets can be substantially wider and heavier.
For example, a Frame 9 system with drive and option cabinets can reach approximately 1800 mm in width and approximately 2290 kg in the IP20 arrangement.
10. IP54 / Type 12 Alternative Cabinet Reference
The broader PowerFlex 755 Frame 9 family also includes IP54/NEMA Type 12 cabinet arrangements.
| Mechanical Parameter | Frame 9 IP54 Reference |
|---|---|
| Model | 20G1F3C920LNDNNNNN |
| Frame | 9 |
| Approx. Height | 2477 mm |
| Approx. Width | 1200 mm |
| Approx. Depth | 800 mm |
| Approx. Depth With Filter | Up to approximately 898 mm |
| Approx. Weight | 1287 kg |
| Protection Class | IP54 / NEMA Type 12 |
| Cooling | Air Cooled |
| Installation | Floor Mount |
The values above describe the Frame 9 family cabinet arrangement and should not be interpreted as a guarantee that every suffix configuration of the catalog number uses this exact enclosure.
11. Why the 920 A Rating Matters
The 920 A rating is one of the most important characteristics of this model.
At this current level, the drive is intended for large motors and large mechanical systems. It can be used where the motor requires substantial continuous current and where a smaller drive would not provide adequate current capacity.
High current capability is particularly valuable in heavy industrial applications because large motors can experience substantial current demand during acceleration, load changes, process disturbances, or transient operating conditions.
The drive should nevertheless be selected based on the motor’s actual full-load current and the required duty classification rather than selecting solely from the nominal motor kW value.
12. Main Applications
The 20G1F3C920LNDNNNNN is suited to applications where large AC motors require controlled variable-speed operation.
Typical applications include:
- Mining machinery
- Belt conveyors
- Crushers
- Large fans
- Large pumps
- Compressors
- Cement equipment
- Aggregate processing
- Steel and metals equipment
- Material handling
- Process machinery
- Water and wastewater systems
- Large ventilation systems
- Industrial extraction systems
- High-inertia machinery
- Regenerative material-handling equipment
13. Mining Applications
Mining equipment frequently requires large motors and strong speed-control capability.
A 920 A drive can be suitable for large conveyor systems, crushers, mills, ventilation equipment, pumps, and other electrically driven mining machinery.
For conveyors, variable-speed control can help reduce mechanical shock during starting and stopping. A controlled acceleration profile can reduce sudden torque changes through gearboxes, couplings, belts, pulleys, and other mechanical components.
For downhill conveyors, regenerative operation can also become important because the mechanical load may drive the motor during certain operating conditions.
14. Conveyor Systems
Large conveyors are one of the most natural applications for a drive of this size.
A conveyor may need to start with a heavily loaded belt. Starting a large motor directly across the line can create high electrical and mechanical stress.
A variable frequency drive allows the motor to accelerate progressively.
This can provide smoother belt movement, controlled torque development, improved process control, and reduced mechanical shock.
For long conveyors, speed regulation can also help coordinate material flow between upstream and downstream equipment.
15. Crusher Applications
Crushers can create highly variable mechanical loading.
During normal operation, the motor may encounter changes in material density, feed rate, or crushing resistance.
A large industrial drive provides a controlled interface between the electrical system and motor, allowing the motor speed and torque behavior to be managed according to the process requirements.
The 920 A class is appropriate for large crusher systems where motor current requirements are within the drive’s applicable duty rating.
16. Pump Applications
Large pumps can benefit from variable-speed control because pump flow and pressure requirements often change throughout the operating cycle.
Instead of operating continuously at maximum motor speed and regulating the process entirely through mechanical throttling, variable-speed control can adjust motor speed according to the required operating point.
Potential applications include:
- Raw-water pumps
- Cooling-water pumps
- Mine dewatering pumps
- Process pumps
- Irrigation systems
- Wastewater pumps
- Large circulation pumps
- Industrial utility pumps
For centrifugal pumps, reducing motor speed can significantly change flow and pressure characteristics. This can make variable-speed operation attractive in applications with changing process demand.
17. Fan and Blower Applications
Large industrial fans and blowers are another important application.
Examples include:
- Mine ventilation
- Furnace exhaust
- Cement kiln ventilation
- Dust collection
- Industrial ventilation
- Process-air systems
- Boiler-related ventilation
- Large extraction systems
Fan applications often have variable process demand. A large VFD can regulate fan speed instead of continuously operating the motor at full speed.
This can improve process flexibility and may reduce energy consumption when the process does not require full airflow.
18. Compressor Applications
Large compressors can also use variable-speed drives when the compressor technology and process requirements are compatible with VFD operation.
Applications include:
- Industrial air compression
- Process-gas systems
- Chemical processing
- Manufacturing utilities
- Large refrigeration-related systems
- Gas-handling equipment
Compressor applications require careful consideration of minimum speed, maximum speed, acceleration time, torque requirements, cooling, lubrication, resonance, and compressor-specific operating limits.
The drive should therefore be engineered as part of the complete compressor package.
19. Cement and Aggregate Applications
Cement plants contain many large motors.
Typical examples include:
- Crushers
- Conveyors
- Kiln auxiliary systems
- Large fans
- Grinding equipment
- Material feeders
- Dust collection systems
- Pumps
- Material-handling equipment
The 20G1F3C920LNDNNNNN is well suited to the general class of high-power motor-control applications found in these environments.
The drive’s large current capacity is useful where the motor power is substantial and the mechanical system requires controlled acceleration and variable-speed operation.
20. Steel and Metals Applications
Steel mills and metal-processing facilities often use large motors for:
- Rolling equipment
- Fans
- Pumps
- Conveyors
- Cooling systems
- Extraction equipment
- Material handling
- Process lines
These environments may require frequent changes in operating speed or load.
The PowerFlex 755 architecture is intended for industrial automation environments where drive control, motor feedback, diagnostics, and system-level integration are important.
21. Material Handling
Large material-handling equipment can benefit from precise acceleration and deceleration.
Applications may include:
- Bulk-material conveyors
- Transfer systems
- Storage and reclaim systems
- Port equipment
- Mining terminals
- Aggregate handling
- Large industrial elevators
- Heavy-duty processing lines
When the load has substantial inertia, controlling acceleration is especially important.
A large VFD can provide a controlled speed ramp instead of abruptly applying full motor speed.
22. Major Product Advantages
High Current Capability
The 920 A current rating makes the drive suitable for very large AC motors.
This is the primary reason to consider this model over smaller PowerFlex configurations.
Variable-Speed Control
Motor speed can be adjusted according to process requirements rather than keeping the motor at one fixed operating point.
This can improve process control and reduce unnecessary mechanical or electrical stress.
Controlled Acceleration
Acceleration ramps can be used to gradually bring large machinery to operating speed.
This is particularly useful for conveyors, pumps, fans, crushers, and other high-inertia systems.
Controlled Deceleration
The drive can manage motor deceleration according to programmed operating requirements.
In applications involving regeneration, the system architecture can also be designed to handle returned energy appropriately.
High-Power Industrial Construction
The large Frame 9 mechanical structure is designed for industrial installations rather than compact machine-control cabinets.
AFE Regenerative Capability
The identified configuration uses an AFE regenerative input arrangement, making it suitable for applications where regenerative energy handling is required and the overall electrical system has been designed accordingly.
Industrial Automation Integration
PowerFlex 755 drives are designed for integration into industrial automation systems, allowing drive operation to become part of a larger control architecture.
Large-Scale Application Flexibility
The PowerFlex 755 platform includes numerous ratings and configurations, making it possible to select related models for different motor-current requirements.
23. Regenerative Applications
Regenerative operation is particularly useful when the motor is not always consuming mechanical energy.
Consider a conveyor traveling downhill with a loaded belt.
The load can cause the motor to rotate faster than the commanded operating condition. In this situation, the motor behaves as a generator.
Instead of treating all of that energy as unwanted heat through braking resistors, an appropriately engineered regenerative system can return energy toward the AC supply.
This can be useful for high-inertia systems and applications with frequent braking.
The exact energy flow, line-side behavior, and harmonic performance depend on the complete AFE system design and should be evaluated at the project level.
24. Cooling System
The model is an air-cooled drive.
At 920 A, thermal management is a major installation consideration.
The drive produces heat during operation. Proper airflow must therefore be maintained around the cabinet, and the installation area must be capable of handling the heat released into the electrical room.
The cooling design should consider:
- Ambient temperature
- Airflow
- Cabinet ventilation
- Room temperature
- Altitude
- Dust
- Humidity
- Filter condition
- Fan condition
- Required service clearance
Large industrial drive installations should have a planned maintenance schedule for cooling fans, ventilation passages, filters where applicable, and cabinet cleanliness.
25. Installation Considerations
Because the 20G1F3C920LNDNNNNN is a large floor-mounted drive, installation planning should begin before the equipment arrives.
Important considerations include:
- Floor loading.
- Cabinet access.
- Transportation route.
- Lifting equipment.
- Electrical-room dimensions.
- Incoming power cable routing.
- Motor cable routing.
- Grounding.
- Ventilation.
- Heat dissipation.
- Maintenance access.
- Control wiring.
- Communication wiring.
- Emergency-stop integration.
- Motor feedback requirements where applicable.
The physical size of a Frame 9 cabinet is significant. Published Frame 9 dimensions show an approximate 2453 mm height for the IP20 cabinet arrangement, so transportation and installation should be planned carefully.
26. Maintenance
Maintenance of a large VFD should focus heavily on thermal performance, electrical connections, cooling equipment, and cleanliness.
Typical inspection items include:
- Cooling fans
- Air passages
- Cabinet filters where fitted
- Power connections
- Bus connections
- Ground connections
- Control wiring
- Communication connections
- Signs of overheating
- Unusual noise
- Unusual vibration
- Dust accumulation
- Fault history
- Alarm history
Large drive systems should be maintained according to the applicable technical documentation and the maintenance practices of the specific installation.
27. Application Selection Considerations
Before selecting this drive for a motor, the following information should be collected.
| Selection Item | Required Information |
|---|---|
| Model | 20G1F3C920LNDNNNNN |
| Motor Voltage | Confirm motor nameplate voltage |
| Motor Current | Confirm full-load current |
| Motor Power | Confirm motor kW |
| Motor Frequency | Usually 50 or 60 Hz depending on system |
| Motor Speed | Confirm rated RPM |
| Load Type | Conveyor / Pump / Fan / Compressor / Process / Other |
| Duty | Normal / Heavy / Special |
| Overload Requirement | Confirm application requirement |
| Acceleration Time | Confirm mechanical requirement |
| Deceleration Time | Confirm mechanical requirement |
| Regeneration | Determine whether regenerative operation is required |
| Ambient Temperature | Confirm installation environment |
| Altitude | Confirm site altitude |
| Enclosure | Confirm required protection level |
| Installation | Floor mounted |
| Dimensions | Approximately 2453 × 1200 × 600/800 mm for relevant Frame 9 cabinet arrangements |
| Weight | Approximately 1246 kg for the IP20 Frame 9 reference cabinet |
28. Five Related PowerFlex 755 Models
The following models are suitable as related references because they belong to the same PowerFlex 755 family or are closely associated with the same high-power range.
Related Model 1 — 20G1F3C750LNDNNNNN
This is a lower-current PowerFlex 755 configuration at approximately 750 A.
It can be considered when the motor’s full-load current is below the requirement of the 920 A model.
Related Model 2 — 20G1F3C770LNDNNNNN
This model is another closely related high-current PowerFlex 755 configuration.
The 770 A rating makes it a natural comparison when evaluating whether the application really requires a 920 A drive.
Related Model 3 — 20G1F3C920LNANNNNN
This model shares the 920 A current class but uses a different configuration suffix.
It is useful when comparing configuration options around the same basic current rating.
Related Model 4 — 20G1F3C920KNDNNNNN
This is another 920 A PowerFlex 755 configuration.
The different catalog-number configuration can correspond to different enclosure or option arrangements, so it should not be considered an automatic drop-in replacement.
Related Model 5 — 20G1F3D1K0LNDNNNNN
This is a larger-current PowerFlex 755 configuration above the 920 A class.
It can be considered when the motor current exceeds the practical selection range of the 920 A configuration.
Catalog listings contain these related PowerFlex 755 configurations, including the 750 A, 770 A, 920 A and 1.0 kA-class models.
29. Comparison of Five Related Models
| Model | Series | Current Class | Voltage Class | Duty / Application Class | Cooling | Frame | Dimensions | Weight |
|---|---|---|---|---|---|---|---|---|
| 20G1F3C750LNDNNNNN | PowerFlex 755 | 750 A | 400 V class | High-power industrial | Air cooled | Frame 8 class | Approx. 2453 × 600 × 600/800 mm family reference | Approx. 623 kg Frame 8 IP20 reference |
| 20G1F3C770LNDNNNNN | PowerFlex 755 | 770 A | 400 V class | High-power industrial | Air cooled | Frame 8 class | Approx. 2453 × 600 × 600/800 mm family reference | Approx. 623 kg Frame 8 IP20 reference |
| 20G1F3C920LNANNNNN | PowerFlex 755 | 920 A | 400 V class | High-power industrial | Air cooled | Frame 9 class | Approx. 2453 × 1200 × 600/800 mm family reference | Approx. 1246 kg Frame 9 IP20 reference |
| 20G1F3C920KNDNNNNN | PowerFlex 755 | 920 A | 400 V class | High-power industrial | Air cooled | Frame 9 class | Approx. 2453 × 1200 × 600/800 mm family reference | Approx. 1246 kg Frame 9 IP20 reference |
| 20G1F3D1K0LNDNNNNN | PowerFlex 755 | 1.0 kA class | Higher-voltage/current configuration dependent | Very high-power industrial | Air cooled | Frame 9/10 class depending configuration | Configuration dependent | Configuration dependent |
The dimensional and weight figures in this comparison are family-level reference values, not guaranteed individual catalog-number dimensions. PowerFlex 755 Frame 8 and Frame 9 cabinet data show substantial differences in physical size and weight.
30. Five Popular Allen-Bradley Models for Comparison
The following five models provide useful references when evaluating the wider Allen-Bradley drive range.
| Model | Product Family | Approx. Current Class | Voltage Class | Typical Application | Cooling | Frame / Construction | Dimensions | Weight |
|---|---|---|---|---|---|---|---|---|
| 20F1AGC302JN0NNNNN | PowerFlex 753 | 302 A class | Low-voltage AC | Industrial machinery | Air cooled | PowerFlex 753 | Configuration dependent | Configuration dependent |
| 20G1F3C650LNDNNNNN | PowerFlex 755 | 650 A | 400 V class | Large pumps, fans, conveyors | Air cooled | Frame 8 class | Approx. 2453 × 600 × 600/800 mm family reference | Approx. 623 kg Frame 8 IP20 reference |
| 20G1F3C750LNDNNNNN | PowerFlex 755 | 750 A | 400 V class | Large industrial machinery | Air cooled | Frame 8 class | Approx. 2453 × 600 × 600/800 mm family reference | Approx. 623 kg Frame 8 IP20 reference |
| 20G1F3C770LNDNNNNN | PowerFlex 755 | 770 A | 400 V class | Conveyors, pumps, fans, process machinery | Air cooled | Frame 8 class | Approx. 2453 × 600 × 600/800 mm family reference | Approx. 623 kg Frame 8 IP20 reference |
| 20G1F3C920LNDNNNNN | PowerFlex 755 | 920 A | 400 V class | Very large motors and heavy industrial loads | Air cooled | Frame 9B | Approx. 2453 × 1200 × 600/800 mm | Approx. 1246 kg |
The 650 A, 750 A, 770 A and 920 A catalog numbers are represented in the PowerFlex 755 packaged-drive catalog listings.
31. Model Selection: 750 A vs 770 A vs 920 A
When selecting between the 750 A, 770 A and 920 A PowerFlex 755 configurations, motor current should be the first consideration.
A 920 A drive should not automatically be selected simply because it is larger.
If the motor operates comfortably within a lower-current drive’s duty rating, a smaller frame may be more appropriate.
However, if the application has high acceleration torque, high inertia, frequent load changes, or a motor whose current approaches the lower drive rating, the 920 A configuration provides substantially more current capacity.
| Characteristic | 750 A Class | 770 A Class | 920 A Class |
|---|---|---|---|
| Model Example | 20G1F3C750LNDNNNNN | 20G1F3C770LNDNNNNN | 20G1F3C920LNDNNNNN |
| Current | 750 A | 770 A | 920 A |
| Relative Capacity | High | Higher | Very High |
| Typical Frame Class | Frame 8 | Frame 8 | Frame 9 |
| Physical Size | Large | Large | Very Large |
| Typical Use | Large machinery | Large machinery | Very large machinery |
| Reference IP20 Weight | Approx. 623 kg | Approx. 623 kg | Approx. 1246 kg |
| Reference Cabinet Height | Approx. 2453 mm | Approx. 2453 mm | Approx. 2453 mm |
The Frame 9 configuration is substantially heavier than the Frame 8 configuration, making physical installation an important part of the selection process.
32. Conveyor Advantages
For large conveyor systems, the 20G1F3C920LNDNNNNN can provide several practical benefits.
The large current rating provides sufficient capacity for high-power motors.
Variable-speed control allows controlled starting and stopping.
Controlled acceleration can reduce sudden torque transfer into belts, couplings, gearboxes and shafts.
In regenerative conveyor applications, an AFE-based arrangement can provide a method for handling returned mechanical energy.
For long conveyors, adjustable speed can also be used to coordinate material throughput.
33. Pump Advantages
For large pumps, the drive provides speed control instead of requiring the motor to operate permanently at one fixed speed.
This can be useful when demand varies.
A properly controlled pump can operate closer to the process requirement rather than always running at full speed.
Typical benefits include:
- Adjustable flow
- Adjustable pressure
- Controlled starting
- Reduced mechanical shock
- Improved process flexibility
- Easier system coordination
- Potential energy savings under suitable operating conditions
34. Fan Advantages
For fans and blowers, speed control can provide direct adjustment of airflow.
This is useful in ventilation, dust extraction, furnace systems, mining, and process-air applications.
The drive can therefore become an important part of the overall process-control system rather than simply acting as an electronic starter.
35. Mining Advantages
Mining equipment often operates under harsh and changing mechanical conditions.
The large PowerFlex 755 configuration provides high current capability and controlled motor operation for large machinery.
Potential applications include:
- Mine conveyors
- Crushers
- Dewatering pumps
- Ventilation fans
- Material handling
- Processing equipment
- Bulk transfer systems
The specific environmental protection requirements should be checked separately for each mining installation.
36. Cement Plant Advantages
Cement and aggregate equipment often contains multiple large motors.
A 920 A drive can be considered for large:
- Crushers
- Fans
- Conveyors
- Pumps
- Material feeders
- Process machines
- Dust-handling systems
The drive’s variable-speed functionality can provide useful process flexibility, especially where the mechanical load changes during production.
37. Important Engineering Considerations
The following items should be checked before purchasing or replacing this model.
Motor Current
The motor’s actual nameplate current is more important than simply looking at motor horsepower.
Motor Voltage
The motor voltage must match the drive’s applicable voltage class.
Duty Rating
Normal-duty and heavy-duty applications can have different permissible power/current ratings.
Overload
The application may require significant overload capability during acceleration or transient loading.
Regeneration
If the load can drive the motor, regenerative operation should be evaluated.
Harmonics
The electrical system should be evaluated for harmonic requirements and power-quality considerations.
Mechanical Dimensions
The drive is physically large, and sufficient room must be provided.
Weight
At approximately 1246 kg for the Frame 9 IP20 reference cabinet, lifting and transportation planning is important.
Cooling
Airflow and room heat rejection must be considered.
Maintenance Access
Front and side/rear access requirements depend on the final cabinet arrangement.
Replacement Compatibility
A different PowerFlex 755 catalog number should not be treated as a direct replacement until voltage, current, enclosure, input type, options, dimensions, communications, feedback and control requirements have all been checked.
38. Detailed Final Specification Table
| Parameter | Detailed Specification |
|---|---|
| Product Model | 20G1F3C920LNDNNNNN |
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Product Category | Industrial AC Variable Frequency Drive |
| Product Type | Air-Cooled AC Packaged Drive |
| Input Type | AFE Regenerative |
| Input Voltage | 400 V AC class |
| Input Phase | 3 Phase |
| Rated Current | 920 A |
| Normal-Duty Power Class | Approximately 500 kW |
| Heavy-Duty Power Class | Approximately 400 kW |
| Cooling | Air Cooled |
| Mounting | Floor Mount |
| Frame | Frame 9B |
| Enclosure Reference | Type 1 / IP21 |
| Dynamic Braking | None in identified configuration |
| EMC Filter | No EMC in identified configuration |
| Motor Application | Large AC Motors |
| Typical Applications | Conveyor, Pump, Fan, Crusher, Compressor, Process Machinery |
| Regenerative Operation | AFE regenerative configuration |
| Approx. IP20 Height | 2453 mm |
| Approx. IP20 Width | 1200 mm |
| Approx. IP20 Depth | 600 or 800 mm |
| Approx. IP20 Weight | 1246 kg |
| Approx. IP54 Height Reference | 2477 mm |
| Approx. IP54 Width Reference | 1200 mm |
| Approx. IP54 Depth Reference | 800 mm |
| Approx. IP54 Depth With Filter | Up to 898 mm |
| Approx. IP54 Weight Reference | 1287 kg |
| Installation Environment | Industrial Electrical Room / Drive Room |
| Control Application | Variable-Speed AC Motor Control |
| Recommended Selection Method | Match motor current, voltage, duty and application |
| Mechanical Verification | Required before installation |
| Exact Shipping Weight | Configuration dependent |
| Exact Final Dimensions | Configuration dependent |
The Frame 9 dimensions and approximate weights above are based on published PowerFlex 755 family mechanical data and should be checked against the final mechanical configuration before installation.
39. Overall Product Summary
The Allen-Bradley 20G1F3C920LNDNNNNN is a large-capacity PowerFlex 755 AC packaged drive designed for high-power industrial motor control.
Its defining specification is the 920 A current class, combined with a 400 V AC-class three-phase system and an air-cooled Frame 9B floor-mounted construction.
The approximately 500 kW normal-duty and 400 kW heavy-duty classifications make it suitable for large industrial motors where current demand and mechanical loading are considerably higher than those encountered in conventional machine-drive applications.
The AFE regenerative configuration is particularly relevant to applications in which the motor can receive energy from the mechanical load during deceleration or overhauling operation.
This makes the model especially interesting for large conveyors, mining machinery, material-handling systems, high-inertia machinery and other applications where regeneration can form part of the overall drive-system design.
From a mechanical perspective, this is a substantial industrial cabinet. A Frame 9 IP20 reference arrangement is approximately 2453 mm high, 1200 mm wide, and 600 or 800 mm deep, with an approximate weight of 1246 kg.
For an installation of this size, electrical selection and mechanical planning should be treated as equally important.
The motor nameplate current, motor voltage, required duty, acceleration requirements, overload requirements, regenerative behavior, ambient conditions, cooling requirements, cabinet protection, cable arrangement and available installation space should all be checked before final selection.
The 20G1F3C920LNDNNNNN is therefore best understood as a high-power industrial drive for large AC motors and heavy industrial processes, rather than simply as a high-horsepower replacement for a smaller variable frequency drive.
Its combination of high current capacity, variable-speed control, floor-mounted industrial construction and AFE regenerative architecture makes it suitable for demanding applications where large motors must be controlled as part of a complete automated process.