Allen-Bradley 20G11NE3P9AA0NNNNN
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The Allen-Bradley 20G11NE3P9AA0NNNNN is a PowerFlex 755 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 PowerFlex 755 series provides advanced vector control and is engineered for both simple and complex drive applications across a wide range of power ratings.
The PowerFlex 755 features an embedded EtherNet/IP communication port as standard, enabling seamless integration into Logix-based control architectures without the need for additional communication modules. The drive supports multiple control modes including sensorless vector, closed-loop vector with encoder feedback, and permanent magnet motor control. It incorporates a modular hardware architecture that allows optional I/O, safety, and feedback modules to be installed in dedicated option slots, and supports Safe Torque Off (STO) safety functionality to meet SIL 2 and PLd requirements. The drive also includes an integrated LCD HMI interface for local parameter configuration and diagnostics.
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 precise speed and torque regulation are required. The drive's scalable architecture and broad power range make it suitable for both standalone machine-level installations and large integrated process control systems.
Technical Specifications
| Series/Product Family | PowerFlex 755 (PowerFlex 750-Series) |
|---|---|
| Input Voltage | 380 – 480 V AC (3-phase) |
| Output Current (Continuous) | 3.9 A |
| Power Rating | 1.5 kW (2 HP) at 480 V |
| Control Type | Sensorless Vector, Closed-Loop Vector, V/Hz |
| Communication Interface | Embedded EtherNet/IP |
| Feedback Interface | Incremental encoder (via optional module), Resolver (via optional module) |
| Safety Features | Safe Torque Off (STO), SIL 2, PLd |
| Operating Temperature | 0 to 50 degrees C (with derating above 40 degrees C) |
| Storage Temperature | -40 to 70 degrees C |
| Relative Humidity | 5 to 95% non-condensing |
| IP/Protection Rating | IP20 / NEMA Type 1 |
| Mounting | Panel mount |
| Certifications | UL, CE, RCM, RoHS |
| Input Frequency | 47 – 63 Hz |
| Number of Axes | 1 |
Common Fault Codes
- Fault Code 12
- HW OverCurrent – The drive output current has exceeded the hardware overcurrent trip threshold.
Check for a short circuit or ground fault on the motor cables. Verify motor insulation resistance. Inspect drive output power devices. Reduce acceleration rate or load inertia. - Fault Code 13
- Ground Fault – A current path to earth ground has been detected at the drive output.
Disconnect the motor and cables and perform an insulation resistance test. Check motor winding insulation and cable shielding. Repair or replace damaged cables or motor. - Fault Code 29
- Analog Input Loss – The analog input signal has fallen below the configured loss threshold.
Check the wiring and signal source connected to the analog input. Verify the signal level is within the configured range. Check for broken wires or faulty signal source. - Fault Code 33
- DC Bus OverVoltage – The DC bus voltage has exceeded the overvoltage trip level, typically caused by regenerative energy during deceleration.
Increase the deceleration time. Install or enable a dynamic braking resistor. Check the incoming supply voltage for overvoltage conditions. - Fault Code 38
- Phase Loss – Loss of one or more input AC supply phases has been detected.
Check the incoming three-phase supply voltage at all three phases. Inspect input fuses, contactors, and wiring connections. Restore balanced three-phase supply. - Fault Code 63
- SW OverCurrent – The drive output current has exceeded the software-configured overcurrent limit.
Check for mechanical overload on the motor. Verify motor and drive current ratings are compatible. Adjust the overcurrent trip level or reduce the load. - Fault Code 70
- Power Unit – An internal power unit fault has been detected, which may indicate a failure of an internal component.
Cycle power to the drive. If the fault persists, inspect the drive for damaged power components. The drive may require repair or replacement of internal power modules. - Fault Code 122
- Safe Torque Off (STO) – The Safe Torque Off function has been activated, removing gate drive signals from the output power devices.
Verify that the STO input signal is correctly applied and that the safety circuit is in the intended state. If STO activation was unintended, check the safety wiring and safety controller logic.
Frequently Asked Questions
What is the output current rating of the 20G11NE3P9AA0NNNNN?
The 20G11NE3P9AA0NNNNN is rated for 3.9 A continuous output current, corresponding to approximately 1.5 kW (2 HP) at 480 V AC.
What communication protocol is built into the PowerFlex 755 20G11NE3P9AA0NNNNN?
This drive includes an embedded EtherNet/IP port as standard, allowing direct integration with Rockwell Automation Logix controllers and other EtherNet/IP-compatible devices without requiring an additional communication adapter.
Does this drive support Safe Torque Off (STO) safety functionality?
Yes, the PowerFlex 755 includes integrated Safe Torque Off (STO) functionality that meets SIL 2 and PLd safety requirements, suitable for use in safety-rated machine stop applications.
Can the PowerFlex 755 control permanent magnet motors?
Yes, the PowerFlex 755 supports permanent magnet motor control in addition to standard induction motor control modes, including sensorless vector and closed-loop vector with encoder feedback.
What option modules are compatible with the PowerFlex 755?
The PowerFlex 755 features multiple option slots that accept a range of Rockwell Automation modules including additional I/O modules, encoder and resolver feedback modules, alternative communication adapters, and safety modules.
Troubleshooting
Drive faults immediately on start with an overcurrent fault
Measure the resistance between each output phase and ground with the motor disconnected. Check motor winding resistance for shorts or imbalance. Verify the acceleration time parameter setting.
If a winding fault is found, repair or replace the motor. If motor checks are normal, increase the acceleration time parameter to reduce inrush current. Verify the drive current rating matches the motor nameplate.
Drive displays a DC bus overvoltage fault during deceleration
Monitor the DC bus voltage during deceleration using the drive's built-in diagnostics. Check whether a dynamic braking resistor is installed and functioning.
Increase the deceleration time to reduce regenerative energy. If fast deceleration is required, install an appropriately rated dynamic braking resistor and enable the braking function in the drive parameters.
EtherNet/IP communication is not established with the controller
Verify the IP address configuration of the drive using the local HMI. Check the Ethernet cable connection and switch port status. Confirm the controller's I/O configuration matches the drive's node address.
Assign a correct and unique IP address to the drive. Replace the Ethernet cable if faulty. Ensure the EtherNet/IP connection parameters in the Logix controller match the drive configuration, including the correct electronic data sheet (EDS) file.
Motor runs but speed does not match the commanded reference
Check the speed reference source parameter to confirm the correct input is selected. Measure the analog input signal level if an analog reference is used. Verify the maximum and minimum speed parameters.
Correct the speed reference source parameter if misconfigured. Calibrate the analog input signal or replace the signal source if out of range. Adjust the speed scaling parameters to match the application requirements.
Drive powers up but the HMI display remains blank
Check the input supply voltage at the drive terminals for correct level and phase balance. Inspect the control power supply within the drive. Verify that no fault condition is preventing normal startup.
Restore correct input supply voltage if out of specification. If supply voltage is correct and the display remains blank, the internal control board or HMI module may be faulty and require replacement or professional repair.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|
Common defects
Common defects on a Allen-Bradley 20G11NE3P9AA0NNNNN 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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