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The 20G1F3E355LNDNNNNN is a high-power industrial AC variable-frequency drive belonging to the PowerFlex 755 series.
It is designed for large industrial motor-control applications where stable speed regulation, controlled acceleration and deceleration, torque control, feedback capability and integration with an industrial automation system are required.
This model is a 600 V AC, three-phase configuration. The catalog number is associated with a high-current PowerFlex 755 drive, with the rating designation centered around the 355 A class. The published electrical data for this configuration identifies an operating current in the mid-300 A range, with the exact rating depending on the applicable duty and configuration.
The product is intended for considerably larger machinery than compact variable-frequency drives. Typical applications include large conveyors, pumps, fans, compressors, mixers, material-handling equipment and other process machinery.
Because it is a large-frame industrial drive, physical installation is an important part of the product selection. Cabinet space, ventilation, cable routing, lifting access, floor loading and maintenance clearance all need to be considered before installation.
| Item | Specification |
|---|---|
| Model | 20G1F3E355LNDNNNNN |
| Brand | Allen-Bradley |
| Product family | PowerFlex |
| Product series | PowerFlex 755 |
| Product type | AC variable-frequency drive |
| Drive technology | Industrial AC motor control |
| Input | Three-phase AC |
| Voltage class | 600 V AC |
| Current class | 355 A class |
| Published current value | Approximately 365 A for the identified configuration |
| Cooling | Air cooled / forced air |
| Frame | Large-frame configuration |
| Duty | Normal-duty configuration |
| Output | Variable-voltage / variable-frequency AC |
| Motor control | Speed and torque control |
| Feedback | Available through compatible options |
| Installation | Industrial cabinet / floor-mounted arrangement |
| Typical application | Large industrial machinery |
| Approx. reference height | 2453 mm |
| Approx. reference width | 1200 mm |
| Approx. reference depth | 600–800 mm |
| Approx. reference weight | 1246 kg |
| Application environment | Industrial |
| Main function | High-power motor speed and torque control |
Allen-Bradley
PowerFlex
PowerFlex 755
The PowerFlex 755 series is a high-performance industrial AC drive family intended for applications requiring more control flexibility and higher power capability than compact general-purpose drives.
The series is designed around industrial motor-control requirements and can be configured with different feedback, communication, I/O, safety and control options.
The 20G1F3E355LNDNNNNN belongs to the high-power portion of this product family and is intended for large motor applications.
The complete catalog number is:
20G1F3E355LNDNNNNN
The model number contains several configuration elements.
The 20G prefix identifies the PowerFlex 755 family.
The 1F portion identifies the particular large-frame configuration.
The 3E portion is associated with the electrical configuration for this voltage/current group.
The 355 portion identifies the nominal rating class used to distinguish this drive from neighboring current ratings.
The remaining LNDNNNNN characters identify additional configuration characteristics.
For purchasing, engineering and replacement purposes, the entire catalog number should be retained. Two models that look similar but have different configuration characters can have different electrical, enclosure, braking, filtering, control or installation characteristics.
| Parameter | Specification |
|---|---|
| Catalog number | 20G1F3E355LNDNNNNN |
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Drive type | High-power AC VFD |
| Input voltage | 600 V AC class |
| Input phase | 3-phase |
| Current rating | 355 A class |
| Published current value | Approx. 365 A |
| Input frequency | 50/60 Hz industrial supply |
| Output | Variable voltage / variable frequency |
| Cooling | Forced-air cooled |
| Duty | Normal Duty |
| Motor control | Digital AC motor control |
| Speed control | Yes |
| Torque control | Yes |
| Feedback | Option/configuration dependent |
| Communication | Industrial automation integration |
| Installation | Large industrial cabinet |
| Mounting | Floor-mounted / cabinet-mounted |
| Approx. height | 2453 mm |
| Approx. width | 1200 mm |
| Approx. depth | 600–800 mm |
| Approx. weight | 1246 kg |
| Approx. weight including additional cabinets | Can be substantially higher depending on configuration |
| Typical application | Large industrial motor systems |
The most important electrical characteristics of this model are its 600 V AC three-phase input configuration and 355 A class current rating.
The drive is intended for large AC motor applications where a substantial amount of current is required.
The actual usable motor horsepower should not be determined from the catalog number alone. Motor voltage, motor current, power factor, efficiency, duty cycle, overload requirements and ambient operating conditions all need to be considered.
For a normal-duty application, the continuous motor current should be checked against the applicable drive rating.
For applications involving frequent overloads, high starting torque or rapid acceleration, the drive should be evaluated using the actual operating profile rather than simply matching the motor’s nominal horsepower.
The model is intended around a normal-duty industrial configuration.
Duty classification is important because a drive may be capable of handling a certain continuous current but have different permissible overload characteristics depending on the operating mode.
A conveyor carrying a heavy load, for example, can require significantly more torque during acceleration than a fan operating at a stable speed.
Similarly, a mixer can have a changing load as material enters or leaves the mixing chamber.
The following parameters should therefore be considered together:
| Selection parameter | Importance |
|---|---|
| Continuous motor current | Determines basic drive capacity |
| Starting torque | Important for high-inertia machinery |
| Acceleration time | Affects thermal and current loading |
| Deceleration time | Important for high-inertia loads |
| Overload requirement | Determines required drive rating |
| Motor voltage | Must correspond to the drive configuration |
| Ambient temperature | Affects available thermal capacity |
| Altitude | Can affect cooling performance |
| Motor cable length | Can influence installation and filtering requirements |
| Feedback requirement | Determines control configuration |
The 20G1F3E355LNDNNNNN is a large industrial drive rather than a compact wall-mounted VFD.
For product planning, a large-frame cabinet arrangement can be treated as approximately:
| Physical parameter | Approximate value |
|---|---|
| Height | 2453 mm |
| Width | 1200 mm |
| Depth | 600–800 mm |
| Weight | 1246 kg |
| Height | Approx. 96.6 in |
| Width | Approx. 47.2 in |
| Depth | Approx. 23.6–31.5 in |
| Weight | Approx. 2748 lb |
These figures should be treated as reference dimensions for the large-frame cabinet arrangement, not as guaranteed shipping dimensions for every possible catalog configuration.
Additional cabinets, input protection, reactors, filters, disconnect equipment and other options can increase both the footprint and total weight.
The approximately 1246 kg reference weight is especially important for transportation and installation planning.
The 20G1F3E355LNDNNNNN is designed to provide controlled operation of high-power AC motors.
A conventional fixed-frequency motor connection provides relatively limited control over motor speed. A variable-frequency drive changes the electrical output supplied to the motor so that operating speed and torque can be managed according to the machine’s requirements.
This allows a large motor to start gradually, operate at different speeds and stop according to a controlled profile.
The drive can also exchange information with an automation system, making it possible to coordinate motor operation with sensors, controllers, production equipment and other drives.
For a large industrial machine, this makes the drive an important part of the complete control architecture rather than simply a device for changing motor frequency.
The 355 A class rating provides substantial current capacity for large industrial motors.
This makes the drive suitable for equipment that is beyond the practical range of smaller general-purpose drives.
Large conveyors, pumps, fans and process machinery can all require this type of high-current motor-control equipment.
The drive can control the operating speed of the motor.
The motor does not need to remain at one fixed operating speed throughout the entire production cycle.
This can be particularly useful when machine output needs to change according to production conditions.
Large motors can produce significant mechanical stress when started directly.
The drive can increase motor speed gradually according to a programmed acceleration profile.
This can help reduce mechanical shock to:
The same principle applies during stopping.
A controlled deceleration profile can reduce abrupt changes in mechanical load.
This is particularly useful for large rotating equipment with high inertia.
Large industrial machinery often needs controlled torque rather than simple speed regulation.
The PowerFlex 755 platform is designed for applications where motor torque needs to be controlled as part of the machine process.
This is useful for:
The drive can be configured with compatible feedback equipment for applications requiring more precise motor regulation.
Feedback can be useful for applications involving:
The actual feedback hardware should be selected according to the motor and application requirements.
The 355 A class rating makes the model suitable for large motor applications.
It can provide considerably more electrical capacity than compact drive products.
This makes it suitable for high-power production equipment and process systems.
The PowerFlex 755 platform is designed for advanced motor-control applications.
It can provide controlled acceleration, deceleration, speed regulation and torque management.
This gives engineers more flexibility when designing machines with demanding mechanical characteristics.
The drive can operate as part of a larger industrial automation system.
A controller can provide a speed reference while monitoring drive status, current, speed, warnings and faults.
This allows the motor-control system to become part of the production-control architecture.
The drive can be used with many different types of industrial equipment.
Typical applications include:
The large-frame architecture provides the physical space required for high-power electrical components.
This makes the product appropriate for large industrial electrical rooms, machine rooms and engineered control systems.
Large conveyors frequently require high starting torque.
A conveyor may already be loaded when the motor starts, which can produce significant mechanical demand.
The drive can accelerate the motor gradually, helping the conveyor reach operating speed in a controlled manner.
The operating speed can also be changed according to production requirements.
Industrial pumps can require motors with substantial power.
The drive allows pump speed to be adjusted according to the process requirement.
This can be useful for:
Industrial fans can operate at different speeds depending on the required airflow.
The drive can adjust the motor speed according to the ventilation or process requirement.
Typical applications include:
Large compressors can have high motor starting requirements.
Controlled acceleration can make the starting process more manageable and can allow the compressor motor to be integrated into a larger control system.
Mixers can experience changing loads as material is introduced or processed.
The drive can provide controlled speed and torque to accommodate changes in the mechanical load.
Large process machines often require coordinated motor operation.
The drive can be integrated with the machine’s controller so that motor speed becomes part of the overall production sequence.
| Industry | Typical Applications |
|---|---|
| Manufacturing | Large production machinery |
| Mining | Conveyors and material handling |
| Metals | Processing and transport equipment |
| Paper | Process machinery |
| Chemical processing | Pumps, mixers and compressors |
| Water treatment | Large pumps |
| Utilities | Pumps and fans |
| Cement | Conveyors and processing equipment |
| Building materials | Material handling |
| Food processing | Mixers and conveyors |
| Heavy industry | Large motor-driven equipment |
| Process manufacturing | Pumps, fans and compressors |
The main practical advantage of using a high-power variable-frequency drive is the ability to match motor operation to the actual mechanical process.
A pump can run at a speed appropriate to the required flow.
A fan can operate according to the required airflow.
A conveyor can accelerate smoothly and run at the speed required by production.
A mixer can use different speeds for different stages of processing.
A compressor can use controlled motor operation as part of the overall process.
This flexibility is one of the main reasons large industrial variable-frequency drives are widely used in automated machinery.
The following models are useful for comparison within the PowerFlex 755 family and related high-power configurations.
| Model | Product Series | Voltage Class | Current Class | Frame | Cooling | Approx. Dimensions | Approx. Weight |
|---|---|---|---|---|---|---|---|
| 20G1F3E295LNDNNNNN | PowerFlex 755 | 600 V class | 295 A class | Large frame | Air cooled | Approx. 2453 × 1200 × 600–800 mm | 1246 kg |
| 20G1F3E355LNDNNNNN | PowerFlex 755 | 600 V class | 355 A class | Large frame | Air cooled | Approx. 2453 × 1200 × 600–800 mm | 1246 kg |
| 20G1F3E395LNDNNNNN | PowerFlex 755 | 600 V class | 395 A class | Large frame | Air cooled | Approx. 2453 × 1200 × 600–800 mm | 1246 kg |
| 20G1F3E435LNDNNNNN | PowerFlex 755 | 600 V class | 435 A class | Large frame | Air cooled | Approx. 2453 × 1200 × 600–800 mm | 1246 kg |
| 20G1F3E460LNDNNNNN | PowerFlex 755 | 600 V class | 460 A class | Large frame | Air cooled | Approx. 2453 × 1200 × 600–800 mm | 1246 kg |
| 20G1F3E505LNDNNNNN | PowerFlex 755 | 600 V class | 505 A class | Large frame | Air cooled | Approx. 2453 × 1200 × 600–800 mm | 1246 kg |
The models above provide a useful current-rating progression around the target model.
When choosing between them, the motor nameplate current should be compared with the applicable continuous and overload ratings rather than relying only on nominal motor horsepower.
| Model | Series | Voltage Class | Current Class | Cooling | Approx. Dimensions | Approx. Weight |
|---|---|---|---|---|---|---|
| 20G1F3E505LNDNNNNN | PowerFlex 755 | 600 V class | 505 A class | Air cooled | Approx. 2453 × 1200 × 600–800 mm | 1246 kg |
| 20G1F3E565LNDNNNNN | PowerFlex 755 | 600 V class | 565 A class | Air cooled | Approx. 2453 × 1200 × 600–800 mm | 1246 kg |
| 20G1F3E650LNDNNNNN | PowerFlex 755 | 600 V class | 650 A class | Air cooled | Approx. 2453 × 1200 × 600–800 mm | 1246 kg |
| 20G1F3E735LNDNNNNN | PowerFlex 755 | 600 V class | 735 A class | Air cooled | Approx. 2453 × 1200 × 600–800 mm | 1246 kg |
| 20G1F3E820LNDNNNNN | PowerFlex 755 | 600 V class | 820 A class | Air cooled | Approx. 2453 × 1200 × 600–800 mm | 1246 kg |
These higher-current configurations can be considered when the motor or machine requires additional capacity.
A larger drive should not automatically be regarded as a direct substitute, however. The motor, input system, protection equipment, cables, cabinet and application duty all need to be compatible with the selected rating.
| Model | Product Series | Voltage Class | Current / Power Class | Cooling | Approx. Dimensions | Approx. Weight |
|---|---|---|---|---|---|---|
| 25B-D017N104 | PowerFlex 525 | 480 V class | 17 A class | Air cooled | Approx. 220 × 90 × 180 mm class | Approx. 3 kg |
| 20F11ND077JA0NNNNN | PowerFlex 753 | 400/480 V class | 77 A class | Air cooled | Frame dependent | Frame dependent |
| 20G11ND022JA0NNNNN | PowerFlex 755 | 400/480 V class | 22 A class | Air cooled | Frame dependent | Frame dependent |
| 20G1F3E355LNDNNNNN | PowerFlex 755 | 600 V class | 355 A class | Air cooled | Approx. 2453 × 1200 × 600–800 mm | 1246 kg |
| 20G1F3E650LNDNNNNN | PowerFlex 755 | 600 V class | 650 A class | Air cooled | Approx. 2453 × 1200 × 600–800 mm | 1246 kg |
These five models represent different levels of motor-control capacity.
The PowerFlex 525 class is suitable for comparatively small machines, while the PowerFlex 753 and PowerFlex 755 families provide progressively greater control flexibility and industrial application capability.
The Frame 9 PowerFlex 755 configurations are intended for large motor systems and therefore have substantially greater electrical and physical requirements.
| Model | Current Class | Voltage Class | Frame | Application Scale | Approx. Weight |
|---|---|---|---|---|---|
| 20G1F3E295LNDNNNNN | 295 A | 600 V | Large frame | Large | 1246 kg |
| 20G1F3E355LNDNNNNN | 355 A | 600 V | Large frame | Large | 1246 kg |
| 20G1F3E395LNDNNNNN | 395 A | 600 V | Large frame | Large | 1246 kg |
| 20G1F3E435LNDNNNNN | 435 A | 600 V | Large frame | Very large | 1246 kg |
| 20G1F3E460LNDNNNNN | 460 A | 600 V | Large frame | Very large | 1246 kg |
| 20G1F3E505LNDNNNNN | 505 A | 600 V | Large frame | Very large | 1246 kg |
| 20G1F3E565LNDNNNNN | 565 A | 600 V | Large frame | Very large | 1246 kg |
| 20G1F3E650LNDNNNNN | 650 A | 600 V | Large frame | Very large | 1246 kg |
| 20G1F3E735LNDNNNNN | 735 A | 600 V | Large frame | Very large | 1246 kg |
| 20G1F3E820LNDNNNNN | 820 A | 600 V | Large frame | Very large | 1246 kg |
The PowerFlex 755 platform is designed to operate within an industrial automation environment.
A typical installation can include:
The drive can receive operating commands from the automation system and return information about its operating condition.
Typical monitored information can include:
This type of integration is useful when the drive is part of a production line rather than operating as a standalone motor controller.
Feedback becomes important when the machine requires more precise speed regulation.
A suitable feedback device can provide information about actual motor speed to the drive.
This can be useful for:
The final feedback configuration depends on the motor and application.
A high-power drive produces a considerable amount of heat during operation.
The air-cooled construction uses forced airflow to remove heat from the power electronics.
The installation therefore needs sufficient ventilation.
| Thermal consideration | Requirement |
|---|---|
| Ambient temperature | Must remain within the applicable operating range |
| Airflow | Must be sufficient for heat removal |
| Cooling fans | Must remain operational |
| Air filters | Should be kept clean |
| Cabinet clearance | Must allow suitable airflow |
| Load | Higher load increases heat generation |
| Adjacent equipment | Heat from nearby equipment must be considered |
| Altitude | May influence thermal performance |
| Maintenance | Cooling system should be inspected periodically |
Thermal management is especially important when the drive is installed in a closed electrical room or cabinet system with several other high-power devices.
The large physical size of this product means that installation planning should begin before the equipment is delivered.
The approximately 2453 mm height should be checked against the available building access.
The approximately 1200 mm width should also be considered when planning doors, corridors and equipment spacing.
The approximately 1246 kg weight requires suitable transportation and lifting equipment.
| Installation item | Main consideration |
|---|---|
| Floor loading | Verify that the floor can support the equipment |
| Transportation | Check the entire delivery route |
| Door opening | Verify cabinet dimensions |
| Lifting | Use equipment suitable for the actual weight |
| Ventilation | Provide sufficient airflow |
| Cable routing | Provide adequate space for large power cables |
| Grounding | Provide suitable industrial grounding |
| Maintenance | Provide appropriate service access |
| Ambient environment | Control temperature, dust and moisture |
| Cabinet arrangement | Confirm final configuration before installation |
The correct motor should be selected according to the drive’s electrical rating and the actual machine load.
Important motor parameters include:
| Motor parameter | Why it matters |
|---|---|
| Rated voltage | Must correspond to drive voltage |
| Full-load current | Main parameter for drive sizing |
| Rated power | Helps determine application capacity |
| Frequency | Must correspond to motor operation |
| Power factor | Affects electrical loading |
| Efficiency | Affects input/output relationship |
| Service factor | Important for actual operating conditions |
| Starting torque | Important for heavy loads |
| Operating speed | Determines speed-control requirements |
| Feedback | Determines whether encoder integration is needed |
A drive should not be selected simply because its nominal horsepower is close to the motor’s horsepower.
The motor’s rated current and the actual mechanical load are more useful parameters when determining the appropriate drive configuration.
Consider a large conveyor carrying bulk material.
The conveyor may be empty during startup and heavily loaded during normal operation.
Starting the motor directly can create a large current surge and substantial mechanical shock.
With a variable-frequency drive, the motor can accelerate progressively.
The speed can then be controlled according to production requirements.
If the conveyor needs to stop, the drive can use a controlled deceleration profile.
This can help reduce mechanical stress on the gearbox, coupling, belt and other mechanical components.
A large industrial pump may need to operate at different flow levels throughout the day.
Running the motor at full speed at all times may not correspond to the actual process requirement.
The drive allows motor speed to be adjusted.
This makes the drive useful for large pumping applications in industrial water systems, cooling systems and process plants.
A large ventilation fan may operate under different airflow requirements.
During periods of lower demand, the motor speed can be reduced.
During higher demand, the speed can be increased.
The variable-speed drive therefore provides an adjustable interface between the motor and the ventilation process.
Large industrial mixers often experience changes in mechanical load.
Different stages of the process may require different speeds.
The drive can provide controlled acceleration and adjustable operating speed while allowing the motor-control system to communicate with the overall process controller.
| Advantage | Description |
|---|---|
| High current capacity | Suitable for large industrial motors |
| 600 V class | Appropriate for higher-voltage industrial motor systems |
| 355 A class | Provides substantial motor-control capacity |
| Variable speed | Allows motor speed to follow process requirements |
| Controlled acceleration | Helps reduce starting shock |
| Controlled deceleration | Improves stopping behavior |
| Torque control | Useful for demanding mechanical loads |
| Feedback capability | Supports precision applications |
| Automation integration | Allows coordinated machine control |
| Air cooling | Suitable for high-power industrial equipment |
| Large-frame construction | Designed for substantial electrical loads |
| Broad application range | Suitable for pumps, fans, conveyors and process equipment |
Before purchasing or replacing this model, the following information should be confirmed:
| Item | What should be checked |
|---|---|
| Model | 20G1F3E355LNDNNNNN |
| Motor voltage | Confirm motor nameplate |
| Motor current | Confirm full-load amperage |
| Motor power | Confirm kW / HP |
| Motor frequency | Confirm 50/60 Hz requirement |
| Duty | Confirm normal or heavy application |
| Overload | Confirm actual overload requirement |
| Acceleration | Confirm required ramp time |
| Deceleration | Confirm required stopping profile |
| Feedback | Determine whether encoder feedback is required |
| Environment | Temperature, humidity and dust |
| Cooling | Verify airflow and cabinet ventilation |
| Communication | Confirm required industrial network |
| Braking | Determine whether braking equipment is required |
| Cable length | Check motor cable distance |
| Cabinet | Confirm enclosure and installation arrangement |
| Floor | Verify structural load capacity |
| Transportation | Confirm equipment access route |
| Category | Specification |
|---|---|
| Model | 20G1F3E355LNDNNNNN |
| Brand | Allen-Bradley |
| Product series | PowerFlex 755 |
| Product type | High-power AC variable-frequency drive |
| Input voltage | 600 V AC class |
| Input phase | Three-phase |
| Current class | 355 A |
| Published current | Approx. 365 A for the identified configuration |
| Duty | Normal Duty |
| Cooling | Air cooled / forced air |
| Frame | Large-frame configuration |
| Motor control | Speed and torque control |
| Feedback | Available with suitable options |
| Automation integration | Supported |
| Installation | Floor-mounted industrial cabinet |
| Approx. height | 2453 mm |
| Approx. width | 1200 mm |
| Approx. depth | 600–800 mm |
| Approx. weight | 1246 kg |
| Typical applications | Pumps, fans, conveyors, compressors, mixers |
| Typical industries | Manufacturing, mining, utilities, process industries |
| Main advantage | High-power industrial motor control |
| Application level | Large industrial machinery |
The 20G1F3E355LNDNNNNN is a high-power PowerFlex 755 AC drive designed for large industrial motor-control applications.
Its 600 V AC three-phase configuration and 355 A class rating place it in the high-power category, making it suitable for substantial industrial motors and machinery.
The product is particularly useful when the machine requires more than simple motor starting and stopping. Variable-speed control allows the motor to operate according to the actual production requirement, while controlled acceleration and deceleration can improve the mechanical behavior of the equipment.
The drive can also provide torque control and can be configured with suitable feedback equipment for applications requiring improved speed regulation.
Typical applications include large conveyors, industrial pumps, large fans, compressors, mixers, process machinery and heavy material-handling equipment.
The physical characteristics are equally important. A representative large-frame installation is approximately 2453 mm high, 1200 mm wide and 600–800 mm deep, with a reference weight of approximately 1246 kg. The final size and weight can change according to the complete cabinet and option configuration.
When selecting this model, the motor’s actual nameplate voltage and current should be considered first. The machine’s duty cycle, overload requirements, acceleration and deceleration characteristics, operating environment, feedback requirements, communication architecture and installation conditions should then be evaluated.
The 20G1F3E355LNDNNNNN is therefore best suited to projects requiring a substantial industrial AC drive with high-current capability, controlled motor operation and integration into a larger automated machine or process system.