Allen-Bradley 20G11RC8P7AA0NNNNN
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The Allen-Bradley 20G11RC8P7AA0NNNNN is a PowerFlex 755 series AC variable frequency drive manufactured by Allen-Bradley, a brand of Rockwell Automation. This unit belongs to the PowerFlex 750-Series product family, which is designed for demanding industrial motor control applications requiring high performance and flexibility. The SKU 20G11RC8P7AA0NNNNN identifies a specific configuration within the PowerFlex 755 frame, with an 8.7 A continuous output current rating suitable for driving standard and vector-controlled AC induction and permanent magnet motors.
The PowerFlex 755 features an embedded EtherNet/IP port as standard, enabling seamless integration into Logix-based control architectures and supporting CIP Motion for coordinated drive control. The drive supports multiple control modes including sensorless vector, closed-loop vector with encoder feedback, and permanent magnet motor control, providing precise speed and torque regulation. Safety functionality is available via optional safety option cards supporting STO (Safe Torque Off) to SIL 2 / PLd, and the drive accommodates a wide range of optional I/O, feedback, and communication expansion cards through its modular option slot architecture. The unit is built for 400/480 V AC three-phase input and incorporates an integrated EMC filter and DC bus sharing capability in supported configurations.
The PowerFlex 755 is widely deployed in industries such as oil and gas, mining, material handling, water and wastewater treatment, and automotive manufacturing. It is commonly used to control pumps, fans, compressors, conveyors, hoists, and extruders where variable speed control and high dynamic response are required. The drive's scalable architecture, broad communication support, and compatibility with Rockwell Automation's Integrated Architecture make it well suited for both standalone installations and large coordinated multi-drive systems.
Technical Specifications
| Series / Product Family | PowerFlex 755 |
|---|---|
| Input Voltage | 400 / 480 V AC, 3-phase |
| Input Frequency | 47 – 63 Hz |
| Output Current (Continuous) | 8.7 A |
| Output Voltage | 0 – Input Voltage V AC |
| Power Rating | Approx. 4.0 kW (5 HP) at 480 V |
| Control Type | Sensorless Vector, Closed-Loop Vector, V/Hz, PM Motor Control |
| Feedback Interface | Incremental Encoder (via option card), Resolver (via option card) |
| Communication Interface | EtherNet/IP (embedded), DeviceNet / Profibus / ControlNet (via option card) |
| Safety Features | Safe Torque Off (STO), SIL 2 / PLd (via safety option card) |
| Operating Temperature | 0 – 50 °C (with derating above 40 °C) |
| Storage Temperature | -40 – 70 °C |
| Relative Humidity | 5 – 95% non-condensing |
| IP / Protection Rating | IP20 / NEMA Type 1 (standard enclosure) |
| Mounting | Panel / Wall Mount |
| Certifications | UL, CE, RCM, RoHS |
Common Fault Codes
- Fault Code 12
- HW OverCurrent – The drive output current has exceeded the hardware overcurrent trip threshold, indicating a short circuit or severe overload condition.
Check motor wiring for short circuits or ground faults. Verify motor and cable insulation resistance. Inspect load for mechanical jams before restarting. - Fault Code 13
- Ground Fault – A ground fault has been detected in the drive output circuit, motor, or motor cable.
Disconnect the motor and measure insulation resistance between each output phase and ground. Replace damaged cables or motor windings as required. - Fault Code 25
- Decel Inhibit – The drive cannot decelerate at the programmed rate because the DC bus voltage has exceeded the overvoltage limit during deceleration.
Increase the deceleration time parameter, enable the bus voltage regulation feature, or install a dynamic braking resistor to absorb regenerative energy. - Fault Code 29
- Analog Input Loss – The analog input signal has fallen below the configured loss threshold, indicating a broken wire or signal source failure.
Check wiring continuity on the analog input terminals. Verify the signal source is operational. Adjust the analog input loss action parameter if a fault response change is needed. - Fault Code 33
- Auto Restart Tries – The drive has exceeded the maximum number of automatic restart attempts following a fault without a successful run.
Investigate the root cause of the original fault that triggered auto-restart. Clear the fault manually, resolve the underlying issue, and reset the auto-restart counter parameter. - Fault Code 63
- SW OverCurrent – The output current has exceeded the software-defined overcurrent threshold, typically caused by overload or incorrect motor parameters.
Verify motor nameplate data matches drive parameter settings. Check for mechanical overload on the driven equipment. Adjust the overcurrent trip level if the motor is correctly sized. - Fault Code 70
- Power Unit – An internal power structure fault has been detected, which may indicate a failed IGBT, gate driver, or internal power supply issue.
Cycle power and observe if the fault recurs. If persistent, the drive power module or control board may require inspection and replacement by a qualified repair technician. - Fault Code 100
- Parameter Checksum – The drive has detected a checksum error in stored parameter data, indicating possible memory corruption.
Reload parameters from a saved file or re-enter parameters manually. If the fault persists after reloading, the control board memory may be faulty and require replacement.
Frequently Asked Questions
What is the continuous output current rating of the 20G11RC8P7AA0NNNNN?
The 20G11RC8P7AA0NNNNN is rated for 8.7 A continuous output current, corresponding to approximately 4.0 kW (5 HP) at 480 V AC.
What communication protocols does the PowerFlex 755 support?
The PowerFlex 755 includes an embedded EtherNet/IP port as standard. Additional protocols such as DeviceNet, ControlNet, Profibus DP, and Modbus TCP can be added via optional communication expansion cards installed in the drive's option slots.
Does this drive support Safe Torque Off (STO) safety functionality?
Yes, the PowerFlex 755 supports STO to SIL 2 / PLd when the appropriate safety option card is installed. The base drive does not include safety functionality without the option card.
Can the PowerFlex 755 control permanent magnet (PM) motors?
Yes, the PowerFlex 755 supports permanent magnet motor control mode in addition to standard induction motor V/Hz and vector control modes, making it suitable for high-efficiency PM motor applications.
Is the 20G11RC8P7AA0NNNNN compatible with Rockwell Automation Studio 5000 / Logix Designer?
Yes, the PowerFlex 755 with EtherNet/IP integrates directly with Studio 5000 Logix Designer via Add-On Profiles (AOPs), enabling full parameter configuration and CIP Motion coordination within a Logix-based control system.
Troubleshooting
Drive displays a recurring Ground Fault (Fault Code 13) at startup
Disconnect the motor cables from the drive output terminals and measure insulation resistance from each phase (U, V, W) to ground using a 500 V megohmmeter. Also check the cable shield connections.
If insulation resistance is below 1 MOhm, replace the motor cable or motor windings. If resistance is acceptable with the motor disconnected, the fault may originate within the drive output stage and the power module should be inspected.
Drive powers up but does not respond to start command
Check the drive status display for active faults or inhibits. Verify the Enable input signal is present at the designated terminal. Confirm the control source and reference source parameters are configured to match the actual command wiring (terminal block, network, or HIM).
Clear any active faults, ensure the hardware enable signal is wired and active, and verify that control source parameters match the intended command method. Check for any active inhibit conditions in the drive status word.
Motor runs but speed does not match the commanded reference
Compare the commanded speed reference value in the drive parameters against the actual output frequency. Check analog input signal levels at the input terminals with a multimeter if an analog reference is used. Verify scaling parameters for the speed reference.
Recalibrate the analog input if the signal level is incorrect. Correct the speed reference scaling parameters to match the intended speed range. If using a network reference, verify the network node configuration and commanded value in the controller.
Drive overheats and trips on thermal fault during normal operation
Check the ambient temperature at the drive installation location and compare against the 40 °C base rating. Inspect the drive heatsink fins and cooling fan for dust accumulation or fan failure. Verify the drive is not undersized for the actual load current.
Clean heatsink fins and replace the cooling fan if it is not operating. Improve enclosure ventilation or add forced cooling if ambient temperature exceeds 40 °C. Apply current derating if operating above 40 °C per the product specification, or replace with a higher-rated drive if the load consistently exceeds the drive rating.
EtherNet/IP communication loss between drive and PLC controller
Check the physical Ethernet connection, cable integrity, and switch port status. Ping the drive IP address from the controller or engineering workstation. Verify the IP address, subnet mask, and gateway settings in the drive match the network configuration.
Replace faulty Ethernet cables or patch cords. Correct any IP address conflicts or misconfigured network parameters in the drive. Ensure the controller connection instance and RPI settings in the Add-On Profile match the drive configuration. Power cycle the drive after correcting network settings.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|
Common defects
Common defects on a Allen-Bradley 20G11RC8P7AA0NNNNN 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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