Allen-Bradley 20G11RD3P4AA0NNNNN
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The Allen-Bradley 20G11RD3P4AA0NNNNN is a PowerFlex 755 AC variable frequency drive, part of Rockwell Automation's PowerFlex 750-Series product family. This drive is designed for demanding industrial motor control applications requiring high performance, flexibility, and scalability. The 20G11RD3P4AA0NNNNN SKU encodes specific configuration details including voltage class, current rating, and option selections that define its hardware build.
The PowerFlex 755 series features an embedded EtherNet/IP port as standard, enabling seamless integration into Logix-based control architectures without additional communication modules. The drive supports multiple feedback types including incremental encoders, absolute encoders, and resolver interfaces, and is capable of open-loop V/Hz, sensorless vector, and closed-loop flux vector control modes. It incorporates an option card bay architecture allowing installation of I/O expansion, safety, and additional communication modules. The drive meets global safety standards and supports Safe Torque Off (STO) functionality when equipped with the appropriate safety option.
PowerFlex 755 drives are widely deployed in industries such as oil and gas, mining, material handling, water and wastewater, and heavy manufacturing. They are commonly used on applications including conveyors, pumps, fans, compressors, extruders, and winders where precise speed and torque control is required. The drive's scalable architecture and broad power range make it suitable for both standalone machine-level installations and large coordinated drive systems integrated via EtherNet/IP.
Technical Specifications
| Series / Product Family | PowerFlex 750-Series (PowerFlex 755) |
|---|---|
| Input Voltage | 600 V AC (3-phase) |
| Input Frequency | 47 – 63 Hz |
| Output Current (Continuous) | 3.4 A (Normal Duty) |
| Output Voltage | 0 – 600 V AC (3-phase) |
| Power Rating | 2.2 kW (3 HP) at 600 V |
| Control Type | V/Hz, Sensorless Vector, Closed-Loop Flux Vector |
| Communication Interface | Embedded EtherNet/IP (dual-port) |
| Feedback Interface | Incremental Encoder, Absolute Encoder, Resolver (via option card) |
| Safety Features | Safe Torque Off (STO) via safety option card |
| Operating Temperature | 0 – 50 degrees C (without derating) |
| Storage Temperature | -40 – 70 degrees C |
| Relative Humidity | 5 – 95% non-condensing |
| IP / Protection Rating | IP20 (open type) |
| Mounting | Panel / Chassis mount |
| Certifications | UL, cUL, CE, RCM |
Common Fault Codes
- Fault Code 2
- Auxiliary Input fault. The auxiliary input interlock has opened, indicating an external fault condition has been signaled to the drive.
Check the external device or circuit connected to the auxiliary input terminals. Verify wiring integrity and confirm the external interlock device is functioning correctly before resetting the fault. - Fault Code 3
- Power Loss fault. The drive detected a loss of input AC power or a significant voltage sag on the input supply.
Check incoming AC line voltage for all three phases. Inspect fuses, contactors, and supply cabling. Verify that input voltage is within the drive's rated specification before restarting. - Fault Code 7
- Motor Overload fault. The drive's electronic overload protection has tripped due to sustained overcurrent conditions in the motor.
Check the motor for mechanical overload, blocked load, or incorrect motor nameplate data entered in drive parameters. Verify motor FLA setting and overload class parameters are correctly configured. - Fault Code 12
- Hardware Overcurrent fault. The output current has exceeded the drive's hardware overcurrent trip threshold.
Check for a short circuit in the motor cable or motor windings. Verify that acceleration time is not too short for the load. Inspect the output wiring and motor insulation resistance. - Fault Code 13
- Ground Fault. Excessive ground current has been detected, indicating a leakage path between the output phases and earth ground.
Disconnect the motor and cable and perform an insulation resistance test on the motor windings and output cables. Replace damaged cable or motor as required. - Fault Code 33
- Auto Restart Tries fault. The drive has exceeded the configured number of automatic restart attempts without successfully running.
Identify and resolve the underlying fault that is causing repeated trips. Review the fault queue log in the drive for the root cause fault code. Adjust auto-restart parameters if appropriate after the root cause is corrected. - Fault Code 71
- Adapter Loss fault. Communication has been lost between the drive and an installed option card or adapter module.
Check that the option card is fully seated in its bay. Inspect the card for physical damage. Verify communication configuration parameters and re-seat or replace the option card as necessary. - Fault Code 81
- Drive Overtemperature fault. The drive's internal heatsink temperature has exceeded the allowable limit.
Check that ambient temperature is within specification. Inspect and clean heatsink fins and cooling fans. Verify that airflow around the drive is not obstructed. Check fan operation and replace if faulty.
Frequently Asked Questions
What input voltage and power rating does the 20G11RD3P4AA0NNNNN support?
The 20G11RD3P4AA0NNNNN is rated for 600 V AC three-phase input and provides approximately 2.2 kW (3 HP) output power with a continuous output current of approximately 3.4 A under normal duty conditions.
What communication protocols does the PowerFlex 755 support?
The PowerFlex 755 includes an embedded dual-port EtherNet/IP interface as standard. Additional protocols such as DeviceNet, PROFIBUS DP, ControlNet, and Modbus/TCP can be added via optional communication adapter cards installed in the drive's option bays.
Does this drive support Safe Torque Off (STO) safety functionality?
Safe Torque Off is available on the PowerFlex 755 when the appropriate safety option card is installed. The base drive does not include STO as a standard built-in feature; a dedicated safety option module must be fitted.
Can the PowerFlex 755 be used with closed-loop encoder feedback?
Yes, the PowerFlex 755 supports closed-loop vector control with encoder feedback. An appropriate feedback option card must be installed in one of the drive's option bays to interface with incremental or absolute encoders and resolvers.
Is the 20G11RD3P4AA0NNNNN compatible with Rockwell Automation Studio 5000 and Connected Components Workbench?
Yes, the PowerFlex 755 integrates with Studio 5000 Logix Designer via EtherNet/IP using Add-On Profiles (AOPs), enabling full parameter access and diagnostics within the Logix programming environment. It is not typically configured via Connected Components Workbench, which targets simpler drive families.
Troubleshooting
Drive powers up but will not start the motor and displays a fault code immediately
Access the drive's fault queue via the HIM (Human Interface Module) or Studio 5000 to identify the active fault code. Check whether the fault is related to input power, control wiring, or an option card.
Address the specific fault indicated in the fault queue. Common causes include missing enable signal, auxiliary input open, or incorrect parameter configuration. Verify all control wiring connections and confirm enable and start signals are present at the correct terminals.
Drive trips on Ground Fault repeatedly after motor cable installation
Disconnect the motor cable at the drive output terminals and perform a megohmmeter insulation resistance test on the cable and motor windings to earth. Also check cable length and type.
Replace damaged motor cable or motor if insulation resistance is below acceptable limits. For long cable runs, install an output reactor or dV/dt filter to reduce capacitive leakage currents. Ensure cable shielding is properly terminated at the drive enclosure.
EtherNet/IP communication loss between the drive and the PLC controller
Check the drive's embedded EtherNet/IP port status LEDs. Verify IP address configuration on the drive matches the expected address in the PLC program. Use a network switch port status indicator or ping test to confirm physical link.
Confirm IP address, subnet mask, and gateway settings on the drive are correct. Check Ethernet cable integrity and switch port configuration. Verify that the PLC I/O connection parameters match the drive's Add-On Profile configuration in Studio 5000.
Drive overheating and tripping on overtemperature fault
Measure ambient temperature at the drive installation location. Inspect the heatsink cooling fans for operation and check for dust or debris blocking airflow through the heatsink fins.
Clean heatsink fins using compressed air. Replace cooling fans if they are not spinning or are running slowly. Ensure the enclosure or panel has adequate ventilation and that ambient temperature does not exceed 50 degrees C. Consider derating the drive if ambient conditions cannot be improved.
Option card or adapter module not recognized by the drive after installation
Power down the drive and inspect the option card seating in its bay. Check for bent connector pins or physical damage to the card or bay connector. Review the drive firmware version for compatibility with the installed option card.
Re-seat the option card firmly in the correct option bay. Verify that the card is compatible with the installed drive firmware version and update firmware if required. Replace the option card if physical damage is found or if the fault persists after re-seating.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|
Common defects
Common defects on a Allen-Bradley 20G11RD3P4AA0NNNNN are:
Power Supply Related Issues
- No power / drive not turning on
- Blown fuses
- Defective rectifier bridge
- Damaged DC bus capacitors
- IGBT / MOSFET module failure
- Overvoltage / undervoltage errors
Control & Electronics Failures
- Faulty control board or PCB damage
- Firmware or memory corruption
- Fieldbus communication errors (Profibus, Modbus, EtherCAT, CANopen)
- Input / output circuit damage
- Gate driver module failure
Motor Control Problems
- Motor not starting or no output
- Unstable speed control
- No torque output
- Trip during acceleration or deceleration
- Encoder feedback errors
Thermal & Cooling Defects
- Overheating due to failed cooling fans
- Defective temperature sensors
- Poor heatsink performance
Mechanical & Environmental Damage
- Burnt or loose connectors
- PCB track damage
- Corrosion or moisture ingress
- Oil, dust or contamination damage
- Cracked solder joints
Error Codes & Drive Trips
- Overcurrent faults (OC)
- Ground fault / earth leakage error
- Short-circuit fault
- Motor or drive overload
- Overvoltage or undervoltage error
- Undervoltage trip when starting or stopping
- Phase loss / imbalance
- Synchronization issues with multiple drives
Other
- Display defect
- Control keys or keypad not working
- Parameters no longer readable or lost
- Brake resistor problems (brake chopper defect)
- Internal relays/contactors defective
- EMI/RFI interference due to defective filters
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