Allen-Bradley 20G11NB080JA0NNNNN
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The Allen-Bradley 20G11NB080JA0NNNNN 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, designed for demanding industrial motor control applications requiring high performance and flexibility. The PowerFlex 755 is a full-featured drive capable of controlling AC induction, permanent magnet, and synchronous reluctance motors across a wide power range.
The 20G11NB080JA0NNNNN is configured for 480V AC three-phase input with an 80A continuous output current rating, corresponding to approximately 60 HP at 480V. 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 for network communication and is compatible with optional communication adapter modules for DeviceNet, PROFIBUS, and other protocols. It supports optional safety modules rated up to SIL 2 / PLd for safe torque-off and safe speed monitoring functions, and includes a modular option card architecture allowing customization of I/O, feedback, and communication capabilities.
The PowerFlex 755 drive is widely deployed in industries such as oil and gas, mining, metals, pulp and paper, water and wastewater treatment, and material handling. It is commonly used to control pumps, fans, compressors, conveyors, extruders, and hoists where precise speed and torque regulation are required. The drive's scalable architecture, broad power range, and integrated safety options make it suitable for both standalone machine-level installations and integrated plant-wide control architectures using Rockwell Automation's Integrated Architecture platform.
Technical Specifications
| Series / Product Family | PowerFlex 755 |
|---|---|
| Input Voltage | 480V AC, Three-Phase |
| Input Voltage Range | 342 – 528V AC |
| Input Frequency | 47 – 63 Hz |
| Output Current (Continuous) | 80 A |
| Power Rating | 45 kW (60 HP) at 480V |
| Output Frequency Range | 0 – 500 Hz |
| Control Type | Sensorless Vector, Closed-Loop Vector, V/Hz |
| Feedback Interface | Incremental Encoder, Resolver (via option card) |
| Communication Interface | Embedded EtherNet/IP; optional DeviceNet, PROFIBUS DP, ControlNet |
| Safety Features | Safe Torque-Off (STO) SIL 2 / PLd via optional safety 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 |
| Mounting | Panel / Cabinet Mount |
| Certifications | UL, cUL, CE, RCM |
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 or motor windings. Verify motor load is within drive rating. Inspect output wiring and motor insulation resistance. - Fault Code 13
- Ground Fault – A ground fault has been detected on the drive output.
Disconnect the motor and test insulation resistance of motor cables and motor windings to ground. Replace damaged cables or motor if insulation has failed. - Fault Code 25
- Decel Inhibit – The drive is unable to decelerate at the programmed rate due to excessive bus voltage.
Increase the deceleration time parameter. If regenerative loads are present, consider adding a dynamic braking resistor or an active front end. Verify bus overvoltage trip level settings. - Fault Code 29
- Analog Input Loss – An analog input signal has been lost or fallen below the configured minimum threshold.
Check wiring and signal source connected to the analog input. Verify the signal is within the configured range. Review the analog input loss action parameter to confirm desired fault behavior. - Fault Code 33
- Auto Restart Tries – The drive has exceeded the maximum number of automatic restart attempts following a fault.
Identify and resolve the underlying fault that triggered repeated restarts. Review the auto restart configuration parameters. Clear the fault manually after correcting the root cause. - Fault Code 63
- SW OverCurrent – Software-detected output overcurrent condition exceeding the programmed current limit.
Verify motor nameplate data is correctly entered in drive parameters. Check for mechanical overload on the driven equipment. Reduce load or increase current limit settings if appropriate. - Fault Code 70
- Power Unit – An internal power structure fault has been detected within the drive.
Cycle power to the drive. If the fault persists, inspect the power module and gate driver boards for damage. Contact a qualified service technician for internal component inspection or replacement. - Fault Code 100
- Parameter Checksum – A checksum error has been detected in the drive parameter memory, indicating possible data corruption.
Reload parameters from a saved configuration file or re-enter parameters manually. If the fault recurs, the internal memory or main control board may require replacement.
Frequently Asked Questions
What is the continuous output current and horsepower rating of the 20G11NB080JA0NNNNN?
This unit is rated for 80A continuous output current, corresponding to approximately 60 HP (45 kW) when operated on a 480V AC three-phase supply.
What communication protocols does the PowerFlex 755 20G11NB080JA0NNNNN support?
The drive includes an embedded EtherNet/IP port as standard. Additional protocols including DeviceNet, PROFIBUS DP, ControlNet, and others can be added via optional communication adapter modules installed in the drive's option card slots.
Does this drive support safe torque-off or other functional safety features?
Yes, the PowerFlex 755 supports Safe Torque-Off (STO) rated to SIL 2 / PLd through an optional safety option module. The base drive does not include safety functionality without the appropriate option card installed.
Can the PowerFlex 755 control permanent magnet motors as well as induction motors?
Yes, the PowerFlex 755 supports control of AC induction motors, permanent magnet motors, and synchronous reluctance motors, provided the appropriate feedback and control mode parameters are configured.
What option card slots are available on the PowerFlex 755?
The PowerFlex 755 provides multiple option card slots that accept I/O expansion cards, encoder and resolver feedback cards, communication adapter modules, and safety option modules, allowing the drive to be customized for specific application requirements.
Troubleshooting
Drive trips on overcurrent fault immediately after starting the motor
Measure insulation resistance of motor cables and motor windings phase-to-phase and phase-to-ground. Check that motor nameplate data (voltage, current, frequency, poles) is correctly programmed into the drive parameters.
Replace damaged motor cables or motor if insulation failure is confirmed. Correct motor nameplate parameters in the drive. If wiring is intact, reduce acceleration rate or increase current limit settings to accommodate high-inertia loads.
Drive displays a ground fault on startup or during operation
Disconnect the motor cable at the drive output terminals and perform an insulation resistance test on the cable and motor separately. Check for physical damage to cable insulation, particularly at conduit entry points.
Replace damaged motor cables. If the motor insulation has failed, the motor requires rewinding or replacement. Ensure cable shields are grounded at one end only and that the drive chassis is properly grounded.
EtherNet/IP communication is not established with the controller
Verify the IP address, subnet mask, and gateway configured in the drive match the network settings expected by the Logix controller. Check physical Ethernet cable connections and confirm link activity LEDs are illuminated on the drive and switch.
Reconfigure the drive IP address using the drive HIM keypad or Rockwell Automation's BootP/DHCP server tool. Replace the Ethernet cable if no link activity is detected. Verify the controller I/O configuration matches the drive's configured data format.
Drive runs but motor speed does not respond to speed reference changes
Check the speed reference source parameter to confirm it is set to the intended source (analog input, network reference, or keypad). Measure the analog input signal voltage at the drive terminals if an analog reference is used.
Correct the speed reference source parameter. If using an analog input, verify the signal wiring and that the source device is outputting the correct signal level. Check for active speed override or jog commands that may be taking priority over the primary reference.
Drive runs hot and triggers thermal overload or overtemperature fault
Check that the ambient temperature at the drive installation location does not exceed 40 degrees C without derating. Inspect the drive cooling fan for operation and verify that ventilation clearances around the drive enclosure are maintained.
Clean or replace the drive cooling fan if it is not operating. Ensure minimum ventilation clearances are maintained above and below the drive. If ambient temperature exceeds 40 degrees C, derate the drive output current according to the published derating curves or improve enclosure cooling.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|
Common defects
Common defects on a Allen-Bradley 20G11NB080JA0NNNNN 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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