Allen-Bradley 20G11NE017AA0NNNNN
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The Allen-Bradley 20G11NE017AA0NNNNN 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 PowerFlex 755 provides precise speed and torque control for AC induction and permanent magnet motors across a wide range of power ratings.
The 20G11NE017AA0NNNNN is configured for 480V AC three-phase input with a continuous output current rating of 17 amps, corresponding to approximately 11 kW (15 HP) of motor power. It supports multiple control modes including sensorless vector, closed-loop vector with encoder feedback, and volts-per-hertz control. The drive features an embedded EtherNet/IP port as indicated by the 'E' option code, enabling seamless integration with Logix-based control systems and supporting CIP Motion for coordinated motion control. The modular architecture allows for optional I/O, safety, and feedback expansion modules to be installed in the available option bays.
The PowerFlex 755 drive 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 operation and energy savings are required. The drive's integrated safety options and EtherNet/IP connectivity make it particularly suitable for modern connected manufacturing environments that require integration with Rockwell Automation's Integrated Architecture platform.
Technical Specifications
| Series / Product Family | PowerFlex 755 (PowerFlex 750 Series) |
|---|---|
| Input Voltage | 480V AC, Three-Phase |
| Input Voltage Range | 342 – 528V AC |
| Input Frequency | 47 – 63 Hz |
| Output Current (Continuous) | 17 A |
| Power Rating | 11 kW (15 HP) |
| Output Frequency Range | 0 – 500 Hz |
| Communication Interface | Embedded EtherNet/IP |
| Control Type | Sensorless Vector, Closed-Loop Vector, V/Hz |
| Feedback Interface | Incremental Encoder (via optional module) |
| Operating Temperature | 0 – 50 degrees C (with derating above 40 degrees C) |
| Storage Temperature | -40 – 70 degrees C |
| Relative Humidity | 5 – 95% non-condensing |
| IP / Protection Rating | IP20 (open type enclosure) |
| Mounting | Panel / Chassis Mount |
| Certifications | UL, cUL, CE, RCM |
| Safety Features | Safe Torque Off (STO) via optional safety module |
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 output wiring. Verify motor insulation resistance. Inspect drive output power devices. Reduce acceleration rate or load. - Fault Code 13
- Ground Fault – A current path to earth ground has been detected at the drive output.
Disconnect the motor and test insulation resistance with a megohmmeter. Inspect output wiring for damaged insulation. Check motor windings for ground faults. - Fault Code 25
- Decel Inhibit – The drive is unable to decelerate within the programmed deceleration time, typically due to excessive regenerative energy.
Increase the deceleration time parameter. Enable the bus voltage regulation feature. Consider adding a dynamic braking resistor or regenerative unit. - Fault Code 29
- Analog Input Loss – An analog input signal has fallen below the configured loss threshold (e.g., 4 mA signal lost on a 4-20 mA input).
Check the analog signal source and wiring continuity. Verify the transmitter or controller providing the signal is powered and functioning. Review the analog input loss action parameter settings. - Fault Code 33
- Auto Restart Tries – The drive has exceeded the maximum number of automatic restart attempts after a fault.
Identify and resolve the underlying fault that caused repeated restarts. Review the fault queue log. Increase the auto restart delay or reduce the number of retries if appropriate. - Fault Code 63
- SW OverCurrent – Software-detected overcurrent condition; output current exceeded the programmed software overcurrent limit.
Check for mechanical overload on the driven equipment. Verify motor nameplate data is correctly entered in the drive parameters. Inspect for phase imbalance or motor winding issues. - Fault Code 71
- PM Motor Stall – The permanent magnet motor has stalled or lost synchronism with the drive output.
Verify motor parameters are correctly configured for the connected PM motor. Check for excessive load or mechanical binding. Ensure encoder feedback is properly connected if closed-loop control is used. - Fault Code 100
- Parameter Checksum – A checksum error has been detected in the drive parameter memory, indicating possible data corruption.
Perform a factory reset and re-enter all parameters. If the fault persists, the control board or memory may be faulty and require replacement.
Frequently Asked Questions
What is the output current and power rating of the 20G11NE017AA0NNNNN?
The 20G11NE017AA0NNNNN is rated for 17 amps continuous output current at 480V AC three-phase input, corresponding to approximately 11 kW (15 HP) of motor power.
What communication protocol is built into this drive?
This unit includes an embedded EtherNet/IP port, as indicated by the 'E' in the catalog number. This allows direct integration with Allen-Bradley Logix controllers and supports CIP Motion for coordinated drive control without requiring an additional communication module.
Can the PowerFlex 755 20G11NE017AA0NNNNN be used with a permanent magnet motor?
Yes, the PowerFlex 755 supports control of both AC induction motors and permanent magnet (PM) motors. Proper motor nameplate data and control mode configuration are required for PM motor operation.
Does this drive support Safe Torque Off (STO) safety functionality?
The PowerFlex 755 supports Safe Torque Off (STO) and other safety functions, but these require the installation of an optional safety module in one of the drive's expansion option bays. The base unit does not include safety functionality by default.
What optional modules can be installed in the PowerFlex 755?
The PowerFlex 755 features multiple option bays that accept a range of plug-in modules including additional I/O modules, encoder feedback modules, alternative communication adapters, and safety modules, allowing the drive to be configured for a wide variety of application requirements.
Troubleshooting
Drive displays an overcurrent fault immediately upon starting the motor
Check the output current waveform with a clamp meter on all three output phases. Verify motor wiring for phase-to-phase or phase-to-ground short circuits. Confirm motor nameplate data matches drive parameter settings.
Repair any wiring faults or motor insulation failures. Correct motor nameplate parameters in the drive. Increase the acceleration time to reduce inrush current. If the fault persists with no load connected, the output power devices may be damaged and the drive should be sent for repair.
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 and the control source is correctly configured. Confirm the start command source parameter matches the actual command method being used (terminal block, network, or HIM).
Clear any active faults via the HIM or control system. Verify all digital input wiring and signal levels. Confirm the drive is not in a faulted or inhibited state due to a missing permissive signal. Review the drive logic command and reference source parameters.
EtherNet/IP communication is not established with the controller
Check the Ethernet link LEDs on the drive for link activity. Verify the IP address configured on the drive matches the address expected by the Logix controller. Confirm the network cable and switch port are functional.
Use the drive HIM or RSLinx to verify and correct the IP address, subnet mask, and gateway settings. Ensure the EtherNet/IP module is properly seated. Check the Logix I/O tree for connection errors and verify the correct drive EDS file and module definition are being used.
Motor runs but speed does not match the commanded reference
Verify the reference source parameter is set correctly and the analog or network reference signal is within the expected range. Check for slip compensation settings and motor nameplate data accuracy. Confirm encoder feedback wiring if closed-loop vector mode is active.
Correct the reference source and scaling parameters. Re-enter accurate motor nameplate data and perform an autotune procedure. If using encoder feedback, verify wiring, encoder supply voltage, and pulses-per-revolution parameter settings.
Drive runs hot and triggers thermal overload faults
Check the ambient temperature at the drive installation location. Inspect the drive heatsink and cooling fan for dust buildup or obstruction. Verify the drive is not operating above its continuous current rating for the installed ambient temperature.
Clean the heatsink fins and ensure adequate airflow clearance above and below the drive. Replace the cooling fan if it is not running at full speed. Apply output current derating if ambient temperature exceeds 40 degrees C. Reduce the carrier frequency to lower internal losses.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|
Common defects
Common defects on a Allen-Bradley 20G11NE017AA0NNNNN 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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