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The 20G11RC3P5AA0NNNNN is an industrial AC variable frequency drive belonging to the PowerFlex 755 series.
It is designed for controlling three-phase AC motors in industrial automation, machinery, material handling, pumping, ventilation, conveying and process-control applications.
Compared with a small general-purpose inverter, this drive belongs to a more advanced industrial drive platform. It combines variable-speed motor control with programmable acceleration and deceleration, motor protection, industrial communication, diagnostic functions, dynamic braking capability and flexible control methods.
The model is designed for the 400 V-class three-phase power system and provides an output current rating of approximately 3.5 A. Its normal-duty motor capacity is approximately 1.5 kW, making it suitable for a larger motor than the 0.75 kW-class 20G11RC2P1AA0NNNNN configuration.
The drive uses a compact Frame 1 mechanical format and forced-air cooling. It is an IP20 / Open Type product and is therefore intended for installation inside a suitable electrical enclosure.
The integrated industrial communication capability makes the drive particularly suitable for automated machines where motor speed, status, fault information and operating parameters need to be exchanged with a controller.
| Item | Description |
|---|---|
| Brand | Allen-Bradley |
| Product family | PowerFlex |
| Product series | PowerFlex 755 |
| Product group | PowerFlex 750-Series |
| Product type | AC Variable Frequency Drive |
| Drive category | Industrial AC drive |
| Application category | Motor speed and torque control |
| Cooling type | Forced-air cooled |
| Frame | Frame 1 |
| Enclosure | Open Type |
| Protection rating | IP20 |
| Input system | Three-phase AC |
| Voltage class | 400 V class |
| Main communication | EtherNet/IP |
| Typical motor application | Approximately 1.5 kW class |
| Main purpose | Industrial AC motor control |
The 20G11RC3P5AA0NNNNN is therefore part of the same general product platform as other PowerFlex 755 models.
This is important for industrial users because different motor capacities can be accommodated within a common drive architecture.
| Parameter | Specification |
|---|---|
| Model | 20G11RC3P5AA0NNNNN |
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Product type | AC Variable Frequency Drive |
| Input phase | 3-phase |
| Voltage class | 400 VAC |
| Typical input voltage | 380–480 VAC class |
| Input frequency | 50/60 Hz |
| Output phase | 3-phase |
| Normal-duty power | Approximately 1.5 kW |
| Heavy-duty power | Approximately 0.75 kW |
| Normal-duty output current | Approximately 3.5 A |
| Heavy-duty output current | Approximately 2.1 A |
| Frame size | Frame 1 |
| Cooling | Forced-air |
| Enclosure | Open Type |
| Protection | IP20 |
| Dynamic braking transistor | Built in |
| Dynamic braking resistor | External, application dependent |
| EMC filtering | Configured |
| Communication | Integrated industrial Ethernet |
| EtherNet/IP | Supported |
| PID control | Supported |
| Motor control | V/Hz and vector-control functions |
| Auto tuning | Supported |
| Flying start | Supported |
| Acceleration ramp | Programmable |
| Deceleration ramp | Programmable |
| S-curve | Supported |
| DC bus | Available |
| Keypad/HIM | Not included in this catalog configuration |
| Installation | Vertical cabinet mounting |
| Approx. height | 400.5 mm |
| Approx. width | 110 mm |
| Approx. depth | 211 mm |
| Approx. weight (kg) | Approximately 7 kg |
| Electrical Parameter | 20G11RC3P5AA0NNNNN |
|---|---|
| Input supply | 3-phase AC |
| Voltage class | 400 V |
| Nominal voltage | Approximately 400 VAC |
| Typical voltage range | 380–480 VAC class |
| Input frequency | 50/60 Hz |
| Output voltage | Variable, up to motor-rated voltage |
| Output frequency | Variable |
| Normal-duty current | 3.5 A |
| Heavy-duty current | Approximately 2.1 A |
| Normal-duty power | 1.5 kW |
| Heavy-duty power | Approximately 0.75 kW |
| Motor type | Three-phase AC motor |
| Motor control | V/Hz |
| Sensorless vector | Supported |
| Advanced vector control | Supported according to configuration |
| PID control | Supported |
| Current limit | Programmable |
| Acceleration | Programmable |
| Deceleration | Programmable |
| S-curve | Supported |
| Motor overload protection | Supported |
| Electronic thermal protection | Supported |
| Flying start | Supported |
| Auto tuning | Supported |
| Dynamic braking | Built-in braking transistor |
| EMC filtering | Included/configured |
| DC bus connection | Available |
| Input precharge | Integrated |
The 3.5 A output-current rating is one of the most important selection parameters for this model.
When the drive is used with a motor, the motor’s actual nameplate current should be compared with the drive’s rated current.
The nominal motor power of 1.5 kW provides a useful general reference, but the actual motor current and load characteristics are more important when determining whether the drive is correctly sized.
The drive can be considered according to different load-duty requirements.
For normal-duty applications, the model is approximately a:
1.5 kW / 3.5 A class drive.
For heavier-duty applications requiring greater overload capability, the applicable motor capacity is lower, approximately:
0.75 kW / 2.1 A class.
This distinction is important.
A motor rated at approximately 1.5 kW does not automatically mean that every 1.5 kW motor can be connected to the drive under every operating condition.
For example, a conveyor with frequent starts, heavy loading and high starting torque may require a different sizing approach from a fan with a relatively smooth variable-torque load.
| Mechanical Parameter | Specification |
|---|---|
| Model | 20G11RC3P5AA0NNNNN |
| Frame | Frame 1 |
| Mounting position | Vertical |
| Cooling | Forced air |
| Enclosure | Open Type |
| Protection rating | IP20 |
| Approx. height | 400.5 mm |
| Approx. width | 110 mm |
| Approx. depth | 211 mm |
| Approx. dimensions | 400.5 × 110 × 211 mm |
| Approx. installation footprint | 400.5 × 110 mm |
| Approx. installation depth | 211 mm |
| Approx. weight (kg) | Approximately 7 kg |
| Installation location | Electrical control cabinet |
| Mounting type | Panel/cabinet mounting |
| Airflow | Forced-air cooling |
| Cabinet ventilation | Required |
The approximate physical size is:
400.5 mm × 110 mm × 211 mm (H × W × D)
The approximate product weight is:
7 kg
The narrow width is useful for cabinet installations where control-panel space is limited.
Actual cabinet design should also account for cable bending space, airflow, terminal access and required clearance around the drive.
| Environmental Parameter | Typical Specification |
|---|---|
| Operating temperature | Approximately 0 to 50 °C without standard temperature derating |
| Storage temperature | Approximately -40 to +70 °C |
| Relative humidity | Approximately 5–95%, non-condensing |
| Enclosure | IP20 |
| Installation environment | Clean industrial environment |
| Cooling | Forced air |
| Outdoor installation | Requires additional enclosure |
| Water exposure | Not suitable without additional protection |
| Dust exposure | Requires appropriate cabinet protection |
| Corrosive atmosphere | Additional protection required |
| High-altitude operation | Possible with applicable derating |
| Cabinet ventilation | Required |
Because the product is an IP20/Open Type drive, it should be regarded as an electrical control component rather than a weatherproof standalone enclosure.
In dusty or humid industrial environments, the electrical cabinet should provide appropriate protection.
The 20G11RC3P5AA0NNNNN is designed to regulate the operation of a three-phase AC motor by controlling the frequency and voltage supplied to the motor.
Traditional motor control often involves simply switching a motor on or off.
A variable frequency drive provides a much higher level of control.
The motor can be started gradually, operated at different speeds, slowed down smoothly and monitored through the automation system.
For example, a conveyor motor does not necessarily need to operate at maximum speed all the time.
The drive can receive a speed reference and adjust motor operation accordingly.
This makes the drive suitable for production equipment where operating speed needs to change according to the manufacturing process.
The drive can also communicate with the machine controller, allowing the controller to monitor operating conditions and issue commands.
The drive essentially performs three major functions.
The incoming AC electrical power is converted inside the drive into a controlled electrical output suitable for the motor.
The drive regulates output frequency and voltage to control motor speed and torque.
The drive can communicate with a controller through an industrial network.
This means the motor can become an integrated part of an automated production system.
The combination of these three functions is what makes the product different from a simple motor starter.
The primary purpose of the drive is variable-speed motor control.
The motor can operate at different speeds depending on the machine’s requirements.
This is useful for:
The drive allows the acceleration time to be programmed.
Instead of immediately applying full speed to the motor, the drive can gradually increase speed.
This reduces mechanical shock.
Potential benefits include reduced stress on:
The drive can also control how quickly the motor slows down.
This is useful when a machine needs predictable stopping behavior.
Applications that may benefit include:
The 20G11RC3P5AA0NNNNN includes an integrated dynamic braking transistor.
Dynamic braking can be particularly useful when the motor needs to decelerate quickly.
During deceleration, energy can return from the motor to the drive’s DC bus.
When a braking resistor is correctly installed, this energy can be dissipated as heat.
This provides an additional method for controlling motor deceleration.
Typical applications include:
The braking resistor should be sized according to the actual application.
The drive supports integrated EtherNet/IP communication.
This is particularly useful in modern industrial automation systems.
The controller can exchange information such as:
This can reduce the need for individual hardwired control signals.
It also makes it easier for the controller and operator interface to obtain drive operating information.
The drive supports PID-related control functions.
PID control is useful when the motor speed must respond automatically to a process variable.
For example, a pump may be used to maintain a certain pressure.
A pressure sensor provides feedback.
The drive can then adjust motor speed according to the difference between the actual pressure and the desired pressure.
This can be useful for:
The drive can support different motor-control methods.
V/Hz control is suitable for relatively straightforward speed-control applications.
It can be appropriate for:
Sensorless vector control provides better control of motor torque and speed compared with basic V/Hz control.
It is useful for:
For more demanding applications, more advanced control methods can provide improved torque and speed performance.
The exact control method should be selected according to the motor and application requirements.
The 20G11RC3P5AA0NNNNN is well suited to conveyor systems with motors in its current and power range.
The drive can control:
A conveyor can therefore be integrated into an automated production line.
The drive can control small industrial pumps.
Variable-speed operation can be used to match pump output with process requirements.
Potential benefits include:
PID functionality can be especially useful for pressure or flow regulation.
Fans often do not need to operate at maximum speed continuously.
The drive can adjust fan speed according to the required airflow.
This can be useful for:
Packaging machines frequently use several small and medium-size motors.
The drive can be used for:
EtherNet/IP communication allows the drive to participate in coordinated machine control.
Material-handling machines frequently require smooth acceleration and controlled stopping.
The drive can be used for:
The drive can also be used for auxiliary motors in industrial machinery.
Examples include:
The drive offers considerably more control capability than a simple frequency converter.
This makes it suitable for industrial machinery where speed control and automation integration are important.
EtherNet/IP allows the drive to communicate directly with an industrial controller.
This can simplify machine wiring and provide more operating information to the control system.
The Frame 1 design provides a relatively compact physical format.
This is useful when several control devices must be installed in the same electrical cabinet.
The approximately 1.5 kW normal-duty rating allows this model to control motors larger than the 0.75 kW-class configuration.
It provides a useful step up for machines where a 0.75 kW drive is no longer sufficient.
The integrated braking transistor gives the machine designer additional flexibility when rapid or controlled stopping is required.
The integrated PID function makes the drive useful in process applications where motor speed needs to respond automatically to feedback.
The drive can provide information useful for maintenance and troubleshooting.
This may include:
For machine builders, the PowerFlex 755 platform offers a consistent drive architecture.
If a machine contains motors of different sizes, related models can be selected without completely changing the overall drive platform.
This can simplify:
From a maintenance perspective, networked drives provide useful diagnostic information.
A technician can determine whether a machine problem may be related to:
This can make troubleshooting more systematic.
The following models are useful related configurations within the PowerFlex 755 range.
| Model | Series | Voltage Class | Normal-Duty Power | Normal-Duty Current | Heavy-Duty Power | Frame | Approx. Dimensions H×W×D | Weight (kg) |
|---|---|---|---|---|---|---|---|---|
| 20G11RC2P1AA0NNNNN | PowerFlex 755 | 400 V | 0.75 kW | 2.1 A | 0.37 kW | 1 | 400 × 110 × 211 mm | Approx. 6–7 kg |
| 20G11RC2P1JA0NNNNN | PowerFlex 755 | 400 V | 0.75 kW | 2.1 A | 0.37 kW | 1 | 400.5 × 110 × 211 mm | Approx. 7 kg |
| 20G11RC5P0AA0NNNNN | PowerFlex 755 | 400 V | 2.2 kW class | 5.0 A | 1.5 kW class | 1 | Approx. 400 × 110 × 211 mm | Approx. 7 kg |
| 20G11RC8P7AA0NNNNN | PowerFlex 755 | 400 V | 4.0 kW class | 8.7 A | 2.2 kW class | 1 | Approx. 400 × 110 × 211 mm | Approx. 7 kg |
| 20G11RC011AA0NNNNN | PowerFlex 755 | 400 V | 5.5 kW class | 11.5 A | 4.0 kW class | 1 | Approx. 400 × 110 × 211 mm | Approx. 7–8 kg |
These models provide a practical progression from small motor applications toward higher motor-current requirements.
The 20G11RC2P1AA0NNNNN and 20G11RC2P1JA0NNNNN are particularly close to the target model because they are in the same basic power and frame class.
| Parameter | 20G11RC2P1AA0NNNNN | 20G11RC2P1JA0NNNNN | 20G11RC3P5AA0NNNNN | 20G11RC5P0AA0NNNNN | 20G11RC8P7AA0NNNNN |
|---|---|---|---|---|---|
| Series | PowerFlex 755 | PowerFlex 755 | PowerFlex 755 | PowerFlex 755 | PowerFlex 755 |
| Voltage | 400 V | 400 V | 400 V | 400 V | 400 V |
| Normal-duty current | 2.1 A | 2.1 A | 3.5 A | 5.0 A | 8.7 A |
| Normal-duty power | 0.75 kW | 0.75 kW | 1.5 kW | 2.2 kW class | 4.0 kW class |
| Frame | 1 | 1 | 1 | 1 | 1 |
| Cooling | Air | Air | Air | Air | Air |
| IP rating | IP20 | IP20 | IP20 | IP20 | IP20 |
| EtherNet/IP | Yes | Yes | Yes | Yes | Yes |
| Dynamic braking | Yes | Yes | Yes | Yes | Yes |
| Approx. height | 400 mm | 400.5 mm | 400.5 mm | Approx. 400 mm | Approx. 400 mm |
| Approx. width | 110–190 mm configuration dependent | 110 mm | 110 mm | Approx. 110 mm | Approx. 110 mm |
| Approx. depth | 211 mm | 211 mm | 211 mm | Approx. 211 mm | Approx. 211 mm |
| Approx. weight (kg) | 6–7 kg | 7 kg | 7 kg | Approx. 7 kg | Approx. 7 kg |
For users who are not restricted to the PowerFlex 755 series, the following models represent useful alternatives from the broader Allen-Bradley drive range.
These models should not be considered automatic replacements.
They belong to different drive families and are generally selected when the application emphasizes compact dimensions, simpler control or different functionality.
| Model | Product Family | Voltage Class | Approx. Power Class | Approx. Current | Typical Application | Approx. Dimensions | Weight (kg) |
|---|---|---|---|---|---|---|---|
| 25B-D2P3N104 | PowerFlex 525 | 400 V class | 0.75 kW class | 2.3 A class | Small machinery, pumps, conveyors | Approx. 200 × 90 × 180 mm | Approx. 2 kg |
| 25B-D4P0N104 | PowerFlex 525 | 400 V class | 1.5 kW class | 4.0 A class | Conveyors, fans, machinery | Approx. 200 × 90 × 180 mm | Approx. 2–3 kg |
| 25B-D6P0N104 | PowerFlex 525 | 400 V class | 2.2 kW class | 6.0 A class | Pumps, fans, conveyors | Approx. 200 × 90 × 180 mm | Approx. 2–3 kg |
| 25C-D2P3N104 | PowerFlex 523 | 400 V class | 0.75 kW class | 2.3 A class | General motor control | Approx. 200 × 90 × 180 mm | Approx. 2 kg |
| 25C-D4P0N104 | PowerFlex 523 | 400 V class | 1.5 kW class | 4.0 A class | Small industrial machines | Approx. 200 × 90 × 180 mm | Approx. 2–3 kg |
| Feature | PowerFlex 755 | PowerFlex 525 | PowerFlex 523 |
|---|---|---|---|
| Product positioning | Advanced industrial drive | Compact industrial drive | Compact general-purpose drive |
| Control flexibility | Very high | High | Moderate |
| Network capability | Advanced | Strong | Moderate |
| Physical size | Larger | Smaller | Smaller |
| Application complexity | Medium to high | Low to medium | Low to medium |
| Advanced diagnostics | Strong | Strong | Moderate |
| Option flexibility | High | Moderate | More limited |
| Typical machine size | Small to large industrial machinery | Small to medium machinery | Small machinery |
| Best application | Advanced automation | Compact automated machinery | General-purpose motor control |
| Main advantage | Advanced control and integration | Compact size and flexibility | Simplicity and economical installation |
| Application | Suitability | Important Consideration |
|---|---|---|
| Small conveyor | Excellent | Check motor current |
| Medium-small conveyor | Very good | Check starting torque |
| Pump | Excellent | PID can be useful |
| Fan | Excellent | Variable-torque characteristics |
| Blower | Very good | Check motor power |
| Packaging machine | Excellent | Network communication is useful |
| Feeder | Excellent | Check low-speed torque |
| Material handling | Very good | Check braking requirements |
| Small mixer | Good | Starting torque may be important |
| High-inertia machine | Good | Braking calculation required |
| Frequent start/stop machine | Very good | Check thermal duty |
| High-speed motor | Application dependent | Verify motor frequency limits |
| Outdoor machine | Not directly suitable | Protective enclosure required |
| Washdown machine | Not directly suitable | Additional environmental protection |
| Larger motor | Depends on current | Select higher-rated model |
The drive can maintain controlled motor speed over a wide operating range.
This is useful when machine speed must be adjusted according to production conditions.
Controlled acceleration can reduce sudden mechanical loading.
This is particularly valuable for conveyors and machines with mechanical transmission components.
The drive can reduce motor speed according to a programmed deceleration profile.
The integrated communication interface allows the drive to be incorporated into an industrial automation network.
Operating information and fault conditions can be made available to the control system.
PID functions can allow the drive to respond to process feedback.
The integrated dynamic braking transistor supports applications requiring additional braking capability.
The Frame 1 construction provides a relatively compact form factor for an advanced industrial drive.
The drive should normally be mounted vertically in an appropriate electrical enclosure.
Because it is air cooled, adequate airflow is important.
The cabinet should provide enough space for:
The approximate dimensions of the drive are 400.5 mm high, 110 mm wide and 211 mm deep.
However, the required cabinet space will normally be greater than the physical dimensions of the drive itself.
Additional room may be required for:
A variable frequency drive produces heat during operation.
When several drives are installed in the same cabinet, the combined heat load should be considered.
If the cabinet temperature becomes excessive, the drive may require output derating.
Poor ventilation can result in:
For this reason, cabinet thermal design is an important part of installing the 20G11RC3P5AA0NNNNN.
Regular maintenance can help maintain stable operation.
Recommended checks include:
| Maintenance Item | Purpose |
|---|---|
| Clean cooling passages | Maintain airflow |
| Inspect cooling fan | Prevent overheating |
| Check terminals | Prevent loose connections |
| Inspect cables | Identify insulation or connection problems |
| Review fault history | Identify recurring problems |
| Check cabinet ventilation | Maintain operating temperature |
| Inspect for dust | Prevent airflow restriction |
| Check network connection | Maintain communication |
| Check braking components | Maintain stopping performance |
| Verify parameters | Prevent incorrect motor operation |
The drive should be matched to the motor rather than simply selected according to nominal kW.
The following motor information should be checked:
| Motor Parameter | Importance |
|---|---|
| Rated voltage | Must match drive output voltage |
| Rated current | Critical for drive sizing |
| Rated power | Basic sizing parameter |
| Rated frequency | Important for motor control |
| Rated speed | Useful for control configuration |
| Power factor | Useful for motor setup |
| Motor type | Determines control method |
| Starting torque | Important for heavy loads |
| Load inertia | Important for braking |
| Duty cycle | Important for thermal sizing |
| Encoder requirement | Important for advanced applications |
| Motor Requirement | Suggested Drive Direction |
|---|---|
| Approximately 0.37 kW heavy-duty application | 2.1 A class |
| Approximately 0.75 kW normal-duty application | 2.1 A class |
| Approximately 1.5 kW normal-duty application | 20G11RC3P5AA0NNNNN |
| Approximately 2.2 kW class | 5.0 A class |
| Approximately 4 kW class | 8.7 A class |
| Above 4 kW | Select a higher-rated PowerFlex configuration |
The motor’s nameplate current should always be checked before final selection.
| Parameter | 20G11RC3P5AA0NNNNN |
|---|---|
| Brand | Allen-Bradley |
| Series | PowerFlex 755 |
| Product family | PowerFlex 750-Series |
| Product type | AC Variable Frequency Drive |
| Input | Three-phase AC |
| Voltage | 400 V class |
| Normal-duty power | 1.5 kW |
| Heavy-duty power | Approximately 0.75 kW |
| Normal-duty current | 3.5 A |
| Heavy-duty current | Approximately 2.1 A |
| Frame | Frame 1 |
| Cooling | Forced air |
| Enclosure | Open Type |
| Protection | IP20 |
| EtherNet/IP | Yes |
| PID | Yes |
| Dynamic braking transistor | Yes |
| V/Hz control | Yes |
| Sensorless vector | Yes |
| Auto tuning | Yes |
| Flying start | Yes |
| Approx. height | 400.5 mm |
| Approx. width | 110 mm |
| Approx. depth | 211 mm |
| Approx. weight (kg) | 7 kg |
| Main applications | Conveyors, pumps, fans, packaging, feeders and material handling |
The 20G11RC3P5AA0NNNNN is a practical industrial AC drive for applications requiring approximately 1.5 kW normal-duty motor capacity.
Its combination of a 3.5 A output-current rating, 400 V-class three-phase input, Frame 1 mechanical design, IP20 protection, forced-air cooling, EtherNet/IP communication, PID capability and dynamic braking transistor gives it a broad application range.
The model is especially suitable for machines where motor speed must be controlled automatically rather than simply switched on and off.
For conveyors, the drive provides controlled starting, adjustable speed and controlled stopping.
For pumps, it can provide variable-speed operation and process-control functionality.
For fans and blowers, it allows airflow to be adjusted through motor speed.
For packaging and material-handling machinery, its network communication capability allows motor operation to be coordinated with the rest of the machine.
Its approximate dimensions of 400.5 × 110 × 211 mm and approximate 7 kg weight make it relatively compact for a drive with this level of industrial functionality.
The 20G11RC2P1AA0NNNNN and 20G11RC2P1JA0NNNNN are useful related models when the motor requirement is around the 0.75 kW class.
When more output capacity is required, models such as 20G11RC5P0AA0NNNNN and 20G11RC8P7AA0NNNNN can be considered.
For applications where a smaller and simpler drive is preferred, the PowerFlex 525 and PowerFlex 523 families provide alternative approaches.
The final selection should always be based on the actual motor nameplate current, load characteristics, duty cycle, acceleration requirements, braking requirements, environmental conditions and communication requirements.
Overall, the 20G11RC3P5AA0NNNNN can be regarded as a 400 V-class, Frame 1 industrial AC variable frequency drive for approximately 1.5 kW normal-duty motor applications, combining compact construction with advanced motor control, industrial networking, braking and process-control functions.