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Allen-Bradley 20G11RC3P5JA0NNNNN

PowerFlex 755 AC Drive — Detailed Technical Product Profile

1. Product Overview

The 20G11RC3P5JA0NNNNN is an industrial AC variable frequency drive from the Allen-Bradley PowerFlex 755 series.

It is designed for three-phase AC motor control in industrial automation systems where reliable variable-speed operation, motor protection, controlled acceleration and deceleration, communication capability and flexible motor-control functions are required.

This model is a 400 VAC, three-phase, Frame 1 PowerFlex 755 AC drive with a rated output current of approximately 3.5 A for normal-duty operation and approximately 2.1 A for heavy-duty operation.

Its normal-duty power rating is approximately 1.5 kW, while its heavy-duty rating is approximately 0.75 kW.

The drive uses an IP20 / NEMA/UL Open Type enclosure and forced-air cooling. It is intended to be installed inside an appropriate electrical cabinet or protected industrial enclosure rather than being installed directly outdoors.

One of the most important features of this model is its integrated EtherNet/IP communication capability. This makes it suitable for machines and production systems in which the drive needs to exchange commands, speed references, status information, faults and operating data with a higher-level automation controller.

The model also incorporates a dynamic braking transistor, allowing an appropriate external braking resistor to be used where the application requires more controlled or rapid motor deceleration.

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2. Brand and Product Series

Item	Specification
Brand	Allen-Bradley
Product family	PowerFlex
Product series	PowerFlex 755
Product group	PowerFlex 750-Series
Product type	Industrial AC Variable Frequency Drive
Drive type	Air-cooled AC drive
Frame	Frame 1
Voltage class	400 VAC
Input phase	Three-phase
Enclosure	NEMA/UL Open Type
Protection rating	IP20
Cooling	Forced air
Communication	Embedded EtherNet/IP
Dynamic braking	Built-in dynamic braking transistor
HIM	Blank configuration / no HIM supplied
Typical motor capacity	1.5 kW normal duty
Heavy-duty capacity	0.75 kW
Main applications	Conveyors, pumps, fans, feeders, packaging and industrial machinery

The 20G11RC3P5JA0NNNNN therefore belongs to the advanced industrial-drive category rather than the basic low-cost inverter category.

The PowerFlex 755 platform is intended to provide a common control architecture for industrial machines where different motor-control functions, communication functions and optional hardware may be required.

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3. Basic Product Parameters

Parameter	Specification
Model	20G11RC3P5JA0NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product family	PowerFlex 750-Series
Product type	AC Variable Frequency Drive
Input power	Three-phase AC
Nominal voltage	400 VAC class
Typical input voltage	380–400 VAC class
Input frequency	50/60 Hz
Output	Three-phase variable-frequency AC
Normal-duty output current	3.5 A
Heavy-duty output current	2.1 A
Normal-duty motor power	1.5 kW
Heavy-duty motor power	0.75 kW
Frame size	Frame 1
Cooling	Forced air
Enclosure	NEMA/UL Open Type
Protection	IP20
Dynamic braking transistor	Yes
Braking resistor	External, application dependent
EMC filtering	Filtered configuration
CM jumper	Installed
DC bus terminals	Yes
Input type	AC input with precharge
Communication	Embedded EtherNet/IP
PID	Supported
V/Hz control	Supported
Sensorless vector control	Supported
Advanced vector control	Supported according to configuration
Auto tuning	Supported
Flying start	Supported
S-curve acceleration	Supported
Motor overload protection	Supported
Programmable acceleration	Yes
Programmable deceleration	Yes
HIM/keypad	Not supplied in this configuration
Approx. height	400.5 mm
Approx. width	110 mm
Approx. depth	211 mm
Approx. weight (kg)	6 kg

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4. Detailed Electrical Specifications

Electrical Parameter	20G11RC3P5JA0NNNNN
Input phase	3-phase
Input voltage class	400 VAC
Typical nominal voltage	400 VAC
Typical industrial supply	380–400 VAC
Input frequency	50/60 Hz
Output phase	3-phase
Normal-duty current	3.5 A
Heavy-duty current	2.1 A
Normal-duty power	1.5 kW
Heavy-duty power	0.75 kW
Output voltage	0 to rated motor voltage
Output frequency	Variable
Default carrier frequency	Approximately 4 kHz
Selectable carrier frequency	Approximately 2, 4, 8 and 12 kHz
Control method	PWM
V/Hz control	Yes
Sensorless vector	Yes
Flux-vector capability	Yes, according to configuration
PID	Yes
Current limit	Programmable
Motor overload protection	Yes
Electronic thermal protection	Yes
Auto tuning	Yes
Flying start	Yes
Dynamic braking transistor	Yes
DC bus connection	Yes
Input precharge	Yes
EMC filtering	Yes
Power ride-through	Supported
Acceleration range	Programmable
Deceleration range	Programmable

The 3.5 A normal-duty current rating is one of the most important parameters when selecting this drive.

The nominal 1.5 kW motor rating provides a convenient reference, but actual drive selection should be based primarily on the motor’s nameplate current, operating duty and load characteristics.

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5. Normal-Duty and Heavy-Duty Ratings

The drive has different capacity ratings depending on the application duty.

Normal Duty

Normal-duty operation is approximately:

1.5 kW / 3.5 A

This rating is suitable for applications where the motor does not continuously require the higher overload capability associated with heavy-duty operation.

Typical applications include:

• Fans
• Pumps
• Conveyors
• Feeders
• Packaging equipment
• General machinery

Heavy Duty

The heavy-duty rating is approximately:

0.75 kW / 2.1 A

Heavy-duty applications generally involve greater torque demand, higher overload requirements or more demanding acceleration conditions.

This distinction is important because the same motor power rating does not always correspond to the same drive requirement.

A conveyor carrying a heavy product load can require considerably more starting torque than a fan of the same nominal motor power.

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6. Mechanical Dimensions

Mechanical Parameter	Specification
Model	20G11RC3P5JA0NNNNN
Frame size	Frame 1
Mounting orientation	Vertical
Mounting method	Cabinet / panel mounting
Cooling method	Forced air
Enclosure	IP20 / NEMA/UL Open Type
Height	400.5 mm
Width	110 mm
Depth	211 mm
Overall approximate dimensions	400.5 × 110 × 211 mm
Front footprint	Approximately 400.5 × 110 mm
Installation depth	Approximately 211 mm
Weight (kg)	Approximately 6 kg
Installation environment	Protected electrical cabinet
Cabinet ventilation	Required

The approximate physical dimensions are:

400.5 mm × 110 mm × 211 mm (H × W × D)

The approximate weight is:

6 kg

The actual cabinet space required should be larger than the basic drive dimensions because additional space is normally required for wiring, cable bending radius, airflow, maintenance access and safe installation.

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7. Environmental Parameters

Environmental Parameter	Typical Specification
Operating ambient temperature	Approximately 0 to 50 °C
Storage temperature	Approximately -40 to 70 °C
Relative humidity	Approximately 5–95%, non-condensing
Enclosure	IP20
Cooling	Forced air
Installation type	Indoor / protected installation
Outdoor installation	Additional enclosure required
Water exposure	Not suitable without additional protection
Conductive dust	Requires suitable enclosure
Corrosive atmosphere	Additional environmental protection required
High altitude	Derating may be required
Cabinet ventilation	Required
Installation position	Vertical

The IP20 construction means that this drive should be installed in an appropriate control cabinet.

It should not be treated as a waterproof or outdoor standalone drive.

In applications involving dust, moisture, oil mist, corrosive gases or washdown conditions, the enclosure and cabinet design should be selected accordingly.

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8. Product Introduction

The 20G11RC3P5JA0NNNNN is designed to regulate the speed and torque of a three-phase AC motor.

A conventional motor starter normally provides basic starting and stopping.

A variable frequency drive provides considerably more control.

The drive can control motor acceleration, operating speed and deceleration while also monitoring motor and drive conditions.

This makes it useful for industrial machines where motor speed needs to follow the production process.

For example, a conveyor may need to run at different speeds depending on the production stage.

A pump may need to adjust speed to maintain a certain process pressure.

A fan may need to operate at reduced speed when the required airflow decreases.

A feeder may need to accelerate gradually to avoid product movement or mechanical shock.

The drive can perform these functions while communicating operating information to the machine control system.

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9. Working Principle

The drive converts incoming three-phase AC electrical power into controlled motor power.

The basic operating process can be understood in three stages.

Stage 1 — AC Input

The drive receives three-phase AC power from the industrial electrical supply.

Stage 2 — Power Conversion

The internal power electronics convert the incoming power into a controlled DC-link and then generate a variable-frequency AC output.

Stage 3 — Motor Control

The output frequency and voltage are controlled according to the programmed motor-control method.

This allows the motor to operate at different speeds and torque levels.

The drive can also monitor current, voltage, status and fault conditions.

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10. Embedded EtherNet/IP Communication

The integrated EtherNet/IP capability is one of the major features of the product.

The drive can communicate with an industrial automation controller through the network.

Typical information includes:

Data Type	Typical Function
Start command	Starts the motor
Stop command	Stops the motor
Speed reference	Sets motor speed
Direction command	Controls rotation direction
Actual speed	Provides motor speed feedback
Output current	Monitors motor loading
Drive status	Indicates operating condition
Fault status	Indicates drive fault
Warning status	Indicates warning condition
Parameter information	Allows drive configuration
Diagnostic data	Supports maintenance

This communication capability makes the drive particularly suitable for automated production lines.

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11. Motor Control Functions

V/Hz Control

V/Hz control is a straightforward method of controlling motor speed.

It is suitable for applications where advanced torque control is not essential.

Typical applications include:

• Fans
• Pumps
• Simple conveyors
• Ventilation equipment
• Basic rotating machinery

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Sensorless Vector Control

Sensorless vector control provides improved motor torque and speed control compared with simple V/Hz control.

It can be useful for:

• Conveyors
• Feeders
• Material handling
• Machinery requiring improved low-speed operation
• Applications with changing loads

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Flux Vector Control

More advanced vector-control methods can provide improved control of motor torque and speed.

This can be useful when the machine requires more precise motor behavior.

The exact configuration should be selected according to the motor type and application requirements.

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12. Dynamic Braking

The 20G11RC3P5JA0NNNNN includes a dynamic braking transistor.

This is particularly useful when a motor needs to decelerate rapidly.

During deceleration, a motor can return energy to the drive’s DC bus.

The braking circuit can direct this energy to an appropriately selected external braking resistor.

The resistor converts the braking energy into heat.

Dynamic braking can therefore improve controlled stopping performance.

Typical applications include:

• High-inertia conveyors
• Material-handling machines
• Feed mechanisms
• Repetitive start-stop machinery
• Rapid deceleration systems
• Small rotating machinery

The braking resistor should always be selected according to the actual braking frequency, motor inertia and deceleration requirements.

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13. PID Control

The drive includes process-control capability through PID functions.

This is especially useful in pump and fan applications.

For example, a pump may need to maintain a certain pressure.

A pressure sensor provides feedback to the system.

The drive can then increase or decrease motor speed according to the difference between the desired pressure and actual pressure.

Potential applications include:

• Water pressure control
• Fluid circulation
• Flow control
• Ventilation
• Industrial cooling
• Process equipment

This can allow the drive to perform part of the process-control function without requiring a separate speed-control device.

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14. Applications

14.1 Conveyor Systems

The 20G11RC3P5JA0NNNNN is well suited to small and medium-small conveyor systems within its current and power range.

It can provide:

• Adjustable conveyor speed
• Smooth acceleration
• Controlled deceleration
• Direction control
• Motor overload protection
• Network-based operation
• Fault monitoring

This is useful in production lines where conveyor speed must change according to the production process.

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14.2 Pumps

The drive is suitable for many small industrial pump applications.

Variable-speed control allows the pump motor to operate according to actual process demand.

Applications may include:

• Water circulation
• Cooling-water systems
• Process pumps
• Pressure systems
• Fluid transfer
• Industrial circulation systems

PID control can be used when pressure or flow feedback is available.

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14.3 Fans and Blowers

Fan applications are another suitable area.

Instead of operating continuously at full speed, the motor speed can be adjusted according to airflow requirements.

Potential applications include:

• Industrial ventilation
• Cooling systems
• Exhaust systems
• Equipment cooling
• Process ventilation
• Air circulation

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14.4 Packaging Machinery

Packaging machinery often contains multiple small motors.

The drive can be used for:

• Product conveyors
• Feed rollers
• Film handling
• Product feeders
• Small rotating mechanisms
• Auxiliary machinery

The network interface can allow the motor to operate as part of a coordinated machine sequence.

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14.5 Material Handling

Material-handling systems often require smooth starts and stops.

The drive can be used for:

• Roller conveyors
• Transfer mechanisms
• Feed systems
• Sorting mechanisms
• Small material-handling machines
• Product positioning equipment

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14.6 Feeders

Feeders frequently need controlled motor speed.

The drive can provide gradual acceleration and adjustable operating speed.

This can help control:

• Product flow
• Material quantity
• Feeding speed
• Production synchronization

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14.7 Small Process Machinery

Other suitable applications may include:

• Mixers
• Rotary machines
• Auxiliary pumps
• Cooling fans
• Process feeders
• Small production machinery

The actual suitability depends on motor current, torque requirements and duty cycle.

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15. Product Advantages

15.1 Advanced Industrial Drive Architecture

The PowerFlex 755 platform provides more functionality than a basic variable-speed drive.

It is designed for applications where motor control and automation integration are both important.

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15.2 Integrated EtherNet/IP

The integrated network interface allows the drive to exchange operating data with a controller.

This can reduce hardwired signals and simplify machine integration.

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15.3 Flexible Motor Control

The drive can support different motor-control methods.

This makes it possible to configure the drive according to the requirements of different machines.

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15.4 Dynamic Braking Capability

The integrated braking transistor provides additional flexibility for applications where rapid or controlled deceleration is required.

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15.5 Process Control

PID functionality makes the drive useful for process applications involving pressure, flow or other feedback variables.

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15.6 Compact Frame 1 Construction

The Frame 1 configuration provides a relatively compact mechanical package.

The approximate width of 110 mm is useful in cabinets where horizontal space is limited.

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15.7 Diagnostic Functions

Drive status and fault information can assist maintenance personnel in troubleshooting.

This can reduce the time required to identify electrical or operational problems.

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15.8 Flexible Acceleration and Deceleration

The ability to program acceleration and deceleration allows machine designers to reduce mechanical shock.

This can help protect:

• Belts
• Bearings
• Gearboxes
• Couplings
• Shafts
• Mechanical transmission components

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16. Benefits for Machine Builders

The PowerFlex 755 platform is useful for machine builders who need a consistent drive architecture.

When machines contain motors of different sizes, related PowerFlex 755 configurations can be used.

This can simplify:

• Electrical design
• Drive configuration
• Programming
• Commissioning
• Maintenance training
• Spare-parts management
• Troubleshooting

A common drive family can also make machine expansion easier.

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17. Benefits for Maintenance

The network and diagnostic capabilities provide maintenance personnel with additional information.

For example, when a machine stops unexpectedly, technicians can examine the drive condition before physically inspecting every component.

Potential information can include:

• Motor current
• Drive status
• Fault condition
• Warning condition
• Communication status
• Temperature-related condition
• Operating speed
• Configuration information

This can make troubleshooting more systematic.

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18. Five Recommended Models from the Same Series or Closely Related Models

The following models are useful related selections within the PowerFlex 755 platform.

The exact suitability of each model depends on motor current, voltage, duty cycle and machine requirements.

Model	Series	Voltage Class	Normal-Duty Power	Normal-Duty Current	Heavy-Duty Power	Frame	Approx. Dimensions H×W×D	Weight (kg)
20G11RC2P1JA0NNNNN	PowerFlex 755	400 V	0.75 kW	2.1 A	0.37 kW	1	Approx. 400.5 × 110 × 211 mm	Approx. 6 kg
20G11RC3P5AA0NNNNN	PowerFlex 755	400 V	1.5 kW	3.5 A	0.75 kW	1	Approx. 400.5 × 110 × 211 mm	Approx. 6 kg
20G11RC3P5JA0NNNNN	PowerFlex 755	400 V	1.5 kW	3.5 A	0.75 kW	1	Approx. 400.5 × 110 × 211 mm	Approx. 6 kg
20G11RC5P0JA0NNNNN	PowerFlex 755	400 V	2.2 kW class	5.0 A	1.5 kW class	1	Approx. 400 × 110 × 211 mm	Approx. 6–7 kg
20G11RC8P7JA0NNNNN	PowerFlex 755	400 V	4.0 kW class	8.7 A	2.2 kW class	1	Approx. 400 × 110 × 211 mm	Approx. 7 kg

Among these models, the 20G11RC3P5AA0NNNNN is particularly relevant because it is the closely related earlier configuration of the same 3.5 A drive class.

The 20G11RC3P5JA0NNNNN is also particularly significant because it is the corresponding JA configuration and provides the same basic 3.5 A / 1.5 kW normal-duty electrical class.

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19. Comparison of the Main Related Models

Parameter	20G11RC2P1JA0NNNNN	20G11RC3P5AA0NNNNN	20G11RC3P5JA0NNNNN	20G11RC5P0JA0NNNNN	20G11RC8P7JA0NNNNN
Series	PowerFlex 755	PowerFlex 755	PowerFlex 755	PowerFlex 755	PowerFlex 755
Voltage class	400 V	400 V	400 V	400 V	400 V
Normal-duty current	2.1 A	3.5 A	3.5 A	5.0 A	8.7 A
Normal-duty power	0.75 kW	1.5 kW	1.5 kW	2.2 kW class	4.0 kW class
Heavy-duty current	Approx. 1.3–2.1 A class	2.1 A	2.1 A	Approx. 3.5 A	Approx. 5.0 A
Heavy-duty power	0.37 kW class	0.75 kW	0.75 kW	1.5 kW class	2.2 kW class
Frame	1	1	1	1	1
Cooling	Forced air	Forced air	Forced air	Forced air	Forced air
Protection	IP20	IP20	IP20	IP20	IP20
EtherNet/IP	Yes	Yes	Yes	Yes	Yes
Dynamic braking transistor	Yes	Yes	Yes	Yes	Yes
Approx. height	400.5 mm	400.5 mm	400.5 mm	Approx. 400 mm	Approx. 400 mm
Approx. width	110 mm	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 kg	6 kg	6 kg	6–7 kg	Approx. 7 kg

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20. Five Popular Models from the Same Brand

For applications where the PowerFlex 755 platform is not mandatory, several other Allen-Bradley drive models can be considered.

These models are from different product families and therefore should not be treated as automatic drop-in replacements.

Model	Product Family	Voltage Class	Approx. Power Class	Approx. Current	Main Application	Approx. Dimensions	Weight (kg)
25B-D2P3N104	PowerFlex 525	400 V class	0.75 kW class	2.3 A class	Compact machinery	Approx. 200 × 90 × 180 mm	Approx. 2 kg
25B-D4P0N104	PowerFlex 525	400 V class	1.5 kW class	4.0 A class	Conveyors, pumps, fans	Approx. 200 × 90 × 180 mm	Approx. 2–3 kg
25B-D6P0N104	PowerFlex 525	400 V class	2.2 kW class	6.0 A class	General industrial machinery	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 machinery	Approx. 200 × 90 × 180 mm	Approx. 2–3 kg

The PowerFlex 525 models are generally more compact and are attractive for machinery where cabinet space is important.

The PowerFlex 523 models are more focused on straightforward general-purpose variable-speed applications.

The PowerFlex 755 remains the stronger choice when advanced control, communication, diagnostics and expansion capability are important.

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21. PowerFlex 755 Compared with Compact Drive Families

Feature	PowerFlex 755	PowerFlex 525	PowerFlex 523
Product positioning	Advanced industrial drive	Compact industrial drive	Compact general-purpose drive
Control capability	Very high	High	Moderate
Network integration	Advanced	Strong	More basic
Physical size	Larger	Smaller	Smaller
Application complexity	Medium to high	Low to medium	Low to medium
Diagnostics	Advanced	Good	Basic to moderate
Expansion	Extensive	Moderate	Limited
Motor-control flexibility	Advanced	Advanced for compact class	General purpose
Cabinet space	More	Less	Less
Best application	Advanced industrial machinery	Compact automated machinery	Simple motor-control applications

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22. Application Selection Table

Application	Suitability of 20G11RC3P5JA0NNNNN	Main Reason
Small conveyor	Excellent	Adjustable speed and smooth acceleration
Medium-small conveyor	Very good	3.5 A current class
Pump	Excellent	Variable speed and PID
Fan	Excellent	Adjustable airflow
Blower	Very good	Variable-speed operation
Feeder	Excellent	Controlled speed
Packaging equipment	Excellent	Network integration
Material handling	Very good	Acceleration and braking
Small mixer	Good	Requires torque verification
High-inertia machine	Good	Dynamic braking capability
Frequent start/stop	Very good	Programmable ramps
Process machinery	Very good	PID and communication
Outdoor application	Not directly suitable	Additional enclosure required
Washdown environment	Not directly suitable	Additional environmental protection
Larger motor	Depends on current	Higher-rated drive may be needed

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23. Why This Model Is Suitable for Conveyor Applications

Conveyors often require controlled acceleration.

If a motor starts at full torque immediately, the mechanical system can experience unnecessary shock.

A variable frequency drive allows the motor to increase speed gradually.

The drive can also reduce the motor speed smoothly when the conveyor needs to stop.

This can help reduce stress on:

• Belts
• Gearboxes
• Bearings
• Couplings
• Shafts
• Conveyor structures

Network communication also allows the conveyor drive to be synchronized with sensors, controllers and other motors.

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24. Why This Model Is Suitable for Pump Applications

Pump applications often benefit from variable-speed control.

A fixed-speed pump may continue operating at maximum speed even when the process demand decreases.

With a variable frequency drive, motor speed can be adjusted according to actual demand.

This can improve process control and may reduce unnecessary mechanical operation.

The integrated PID capability is particularly useful when the pump must maintain a process variable such as:

• Pressure
• Flow
• Level
• Differential pressure

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25. Why This Model Is Suitable for Fan Applications

Fan speed has a direct relationship with airflow.

Instead of operating continuously at maximum speed, the drive can adjust motor speed.

This can be useful for:

• Ventilation systems
• Cooling equipment
• Industrial exhaust
• Air circulation
• Process ventilation

The drive can therefore become part of an automated airflow-control system.

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26. Why This Model Is Suitable for Packaging Machinery

Packaging machines often require coordinated motor operation.

A conveyor may need to run at one speed while a feeder operates at another.

The drive’s network capability makes it possible for the control system to coordinate these operations.

Possible functions include:

• Speed reference control
• Start/stop control
• Machine-state monitoring
• Fault monitoring
• Production synchronization
• Motor diagnostics

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27. Maintenance and Reliability Advantages

The drive provides several functions that can help simplify maintenance.

The control system can monitor the drive and receive status information.

This allows maintenance personnel to identify problems more quickly.

Typical conditions that can be investigated include:

• Overcurrent
• Overvoltage
• Undervoltage
• Motor overload
• Overtemperature
• Communication problems
• Configuration problems
• Mechanical overload

Regular inspection of cooling fans, terminals, cables and cabinet ventilation is recommended.

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28. Installation Recommendations

The drive should normally be installed vertically.

Because it is forced-air cooled, sufficient ventilation must be provided.

The cabinet should allow sufficient space around the drive for:

• Air circulation
• Heat dissipation
• Cable installation
• Terminal access
• Maintenance
• Inspection

The physical dimensions are approximately:

400.5 mm high × 110 mm wide × 211 mm deep

The approximate weight is:

6 kg

The cabinet should not be designed using only the exact physical dimensions of the drive.

Additional installation space is needed for wiring and service access.

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29. Electrical Cabinet Design Considerations

The drive produces heat during normal operation.

If multiple drives are installed inside one cabinet, the combined thermal load should be considered.

The cabinet design should account for:

• Ambient temperature
• Drive losses
• Air circulation
• Cooling fans
• Cabinet ventilation
• Filter maintenance
• Internal spacing

Poor ventilation can increase operating temperature and may shorten component life.

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30. Motor Selection Considerations

The motor should be selected according to the actual drive current rating rather than only the motor horsepower.

Important motor parameters include:

Motor Parameter	Importance
Rated voltage	Must be compatible with drive output
Rated current	Critical for drive sizing
Rated power	Basic selection parameter
Rated frequency	Required for correct motor setup
Rated speed	Important for speed control
Motor type	Determines control configuration
Starting torque	Important for conveyors and feeders
Load inertia	Important for deceleration
Duty cycle	Important for thermal loading
Encoder requirement	Important for advanced applications
Motor cable length	Important for installation design

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31. Recommended Selection Logic

A practical selection process can be summarized as follows.

Step 1 — Check Motor Voltage

Confirm that the motor voltage is compatible with the drive’s 400 V-class output.

Step 2 — Check Motor Current

Compare the motor nameplate current with the drive’s rated output current.

For this model, the normal-duty current is approximately:

3.5 A

Step 3 — Check Duty

Determine whether the machine is normal-duty or heavy-duty.

Step 4 — Check Starting Torque

Conveyors, feeders and mixers may require more starting torque than fans or pumps.

Step 5 — Check Braking

If the machine must stop quickly, determine whether dynamic braking is required.

Step 6 — Check Communication

If the drive is part of an automated system, confirm the required communication architecture.

Step 7 — Check Environment

Verify cabinet temperature, humidity, dust and other environmental factors.

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32. Main Technical Advantages Summary

Advantage	Explanation
1.5 kW normal-duty rating	Suitable for small industrial motors
3.5 A output	Appropriate for corresponding motor-current requirements
400 V class	Designed for three-phase industrial power
EtherNet/IP	Supports networked automation
Dynamic braking transistor	Supports controlled braking
PID	Useful for process-control applications
Sensorless vector	Improved motor control
V/Hz	Suitable for straightforward applications
Forced-air cooling	Supports continuous industrial operation
IP20	Suitable for cabinet installation
Frame 1	Compact industrial format
Diagnostics	Helps troubleshooting
Programmable ramps	Smooth starting and stopping
Flexible architecture	Suitable for different machine requirements

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33. Detailed Product Comparison

Parameter	20G11RC3P5JA0NNNNN	20G11RC2P1JA0NNNNN	20G11RC5P0JA0NNNNN	20G11RC8P7JA0NNNNN
Series	PowerFlex 755	PowerFlex 755	PowerFlex 755	PowerFlex 755
Voltage	400 V	400 V	400 V	400 V
Normal-duty current	3.5 A	2.1 A	5.0 A	8.7 A
Normal-duty power	1.5 kW	0.75 kW	2.2 kW class	4.0 kW class
Heavy-duty current	2.1 A	Lower class	Approx. 3.5 A	Approx. 5.0 A
Heavy-duty power	0.75 kW	0.37 kW class	1.5 kW class	2.2 kW class
Frame	1	1	1	1
IP rating	IP20	IP20	IP20	IP20
Cooling	Forced air	Forced air	Forced air	Forced air
EtherNet/IP	Yes	Yes	Yes	Yes
Dynamic braking transistor	Yes	Yes	Yes	Yes
Approx. height	400.5 mm	400.5 mm	Approx. 400 mm	Approx. 400 mm
Approx. width	110 mm	110 mm	Approx. 110 mm	Approx. 110 mm
Approx. depth	211 mm	211 mm	Approx. 211 mm	Approx. 211 mm
Approx. weight (kg)	6 kg	6 kg	6–7 kg	Approx. 7 kg

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34. Product Advantages Compared with a Basic Frequency Converter

Feature	Basic Frequency Converter	20G11RC3P5JA0NNNNN
Variable speed	Yes	Yes
Programmable acceleration	Usually	Yes
Programmable deceleration	Usually	Yes
Industrial network	May require option	Integrated EtherNet/IP
Advanced diagnostics	Limited	Advanced
PID	May be limited	Supported
Vector control	Depends on model	Supported
Dynamic braking	Depends on model	Integrated transistor
Expansion capability	Limited	High
Industrial automation integration	Moderate	Strong
Complex machine applications	Limited	Suitable

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35. Important Considerations Before Replacement

If the 20G11RC3P5JA0NNNNN is being used as a replacement for another drive, the following information should be checked carefully.

The motor voltage must be compatible.

The motor current must not exceed the selected drive’s applicable rating.

The required duty level must be determined.

The control method must be compatible with the machine.

The communication architecture must be considered.

The braking requirements should be checked.

The cabinet dimensions and ventilation must be verified.

The existing drive parameters should also be reviewed before commissioning a replacement.

A drive with the same nominal horsepower is not necessarily a direct replacement if the voltage, current, enclosure, communication interface or option configuration is different.

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36. Final Technical Summary

Parameter	20G11RC3P5JA0NNNNN
Brand	Allen-Bradley
Product series	PowerFlex 755
Product family	PowerFlex 750-Series
Product type	Industrial AC Variable Frequency Drive
Input	3-phase AC
Voltage class	400 VAC
Normal-duty current	3.5 A
Heavy-duty current	2.1 A
Normal-duty power	1.5 kW
Heavy-duty power	0.75 kW
Frame	Frame 1
Cooling	Forced air
Enclosure	NEMA/UL Open Type
Protection	IP20
Input with precharge	Yes
DC terminals	Yes
EMC filtering	Yes
CM jumper	Installed
Dynamic braking transistor	Yes
External braking resistor	Application dependent
EtherNet/IP	Integrated
PID	Supported
V/Hz control	Supported
Sensorless vector	Supported
Advanced vector control	Supported according to configuration
Auto tuning	Supported
Flying start	Supported
Programmable acceleration	Yes
Programmable deceleration	Yes
Approx. height	400.5 mm
Approx. width	110 mm
Approx. depth	211 mm
Approx. weight (kg)	6 kg
Main applications	Conveyors, pumps, fans, feeders, packaging and industrial machinery

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37. Overall Product Assessment

The 20G11RC3P5JA0NNNNN is a capable industrial AC variable frequency drive intended for applications requiring more than simple motor start/stop control.

Its 3.5 A normal-duty output rating and 1.5 kW normal-duty power rating make it suitable for a wide range of smaller industrial motors.

At the same time, the PowerFlex 755 platform provides functions normally associated with more sophisticated industrial automation systems.

The integrated EtherNet/IP interface is particularly useful for machines that require network-based control and monitoring.

The drive can receive speed references, start and stop commands and other control information from an automation system while returning operating status and diagnostic information.

The integrated dynamic braking transistor is another important advantage.

When the machine has a high-inertia load or requires relatively rapid stopping, an appropriately selected braking resistor can be used to improve deceleration performance.

The drive’s support for V/Hz, sensorless vector and advanced motor-control functions also gives engineers flexibility when configuring the motor.

For process applications, the PID capability makes the drive suitable for applications such as pressure-controlled pumps, ventilation systems and other feedback-based processes.

The physical dimensions of approximately 400.5 × 110 × 211 mm and approximate weight of 6 kg provide a relatively compact package for an industrial drive with this level of functionality.

The model is particularly well suited to:

• Conveyor systems
• Small material-handling equipment
• Pumps
• Fans
• Blowers
• Feeders
• Packaging machinery
• Small process machines
• Auxiliary production machinery
• Automated industrial equipment

The closest related models can be selected according to motor capacity.

The 20G11RC2P1JA0NNNNN is appropriate for a lower current and lower power requirement.

The 20G11RC5P0JA0NNNNN provides a higher current class when the motor requirement increases.

The 20G11RC8P7JA0NNNNN is suitable for a further increase in motor capacity.

For applications that do not require the broader capabilities of the PowerFlex 755 platform, compact models from the PowerFlex 525 and PowerFlex 523 families can also be considered.

However, these alternatives should be selected only after checking motor current, duty, communication, braking, control and environmental requirements.

In practical terms, the 20G11RC3P5JA0NNNNN can be regarded as a 400 V-class, three-phase, Frame 1 PowerFlex 755 industrial AC drive rated at approximately 3.5 A and 1.5 kW for normal-duty operation, with integrated EtherNet/IP, dynamic braking capability, advanced motor-control functions, process-control capability and cabinet-oriented IP20 construction.

For industrial automation projects requiring a compact drive but also demanding reliable network communication, flexible motor control and detailed machine integration, this model represents a strong choice within the PowerFlex 755 platform.