Allen-Bradley 20G11FD022JA0NNNNN
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The Allen-Bradley 20G11FD022JA0NNNNN 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 flexible configuration. The PowerFlex 755 is engineered for three-phase AC induction and permanent magnet motor control, offering advanced closed-loop and open-loop operation.
The 20G11FD022JA0NNNNN is rated for 400V AC three-phase input and delivers a continuous output current of 22 amps, corresponding to approximately 11 kW of motor power. It supports multiple control modes including sensorless vector, closed-loop vector, and volts-per-hertz control. The drive features an embedded EtherNet/IP port as standard, enabling seamless integration with Logix-based control systems, and supports optional communication adapters for DeviceNet, Profibus, and other protocols. Onboard safety functions include Safe Torque Off (STO) to SIL 2 / PLd, and the drive accepts a wide range of feedback devices including incremental encoders and resolvers via optional feedback modules.
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 critical. The drive's scalable architecture, broad power range, and integrated safety features make it suitable for both standalone machine-level installations and large coordinated drive systems within a Logix control environment.
Technical Specifications
| Series / Product Family | PowerFlex 755 (PowerFlex 750 Series) |
|---|---|
| Input Voltage | 380 – 480 V AC, Three-Phase |
| Input Frequency | 47 – 63 Hz |
| Output Current (Continuous) | 22 A |
| Power Rating | 11 kW (15 HP) |
| Output Voltage | 0 – Input Voltage, Three-Phase |
| Control Type | Sensorless Vector, Closed-Loop Vector, Volts/Hz |
| Communication Interface | Embedded EtherNet/IP; optional DeviceNet, Profibus DP, ControlNet |
| Safety Features | Safe Torque Off (STO), SIL 2 / PLd (EN 62061 / EN 13849-1) |
| Feedback Interface | Incremental Encoder, Resolver (via optional feedback module) |
| 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 (open type enclosure) |
| Mounting | Panel / Cabinet Mount |
| Certifications | UL, cUL, CE, RCM, EAC |
Common Fault Codes
- Fault Code 2
- Auxiliary Input fault. A digital input configured as an auxiliary input has opened, indicating an external fault condition.
Check the wiring and status of the device connected to the auxiliary input. Clear the external fault condition and reset the drive. - Fault Code 12
- HW OverCurrent fault. 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. Reduce load or acceleration rate and reset the drive. - Fault Code 13
- Ground Fault. Excessive current is flowing to ground, detected at the drive output.
Inspect motor cables and motor windings for insulation breakdown or ground faults. Repair or replace damaged cables or motor before restarting. - Fault Code 25
- OverSpeed fault. Motor speed has exceeded the maximum speed limit parameter setting.
Review and adjust the maximum speed parameter. Check for runaway conditions caused by regenerative load or incorrect feedback wiring. - 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, wiring continuity, and signal levels. Verify the analog input loss action parameter is configured correctly. - Fault Code 33
- Auto Restart Tries fault. The drive has exceeded the maximum number of automatic restart attempts following a fault.
Identify and resolve the underlying fault that triggered the restart attempts. Manually reset the drive after correcting the root cause. - Fault Code 71
- Safe Torque Off (STO) fault. The STO function has been activated, removing torque-producing current from the motor.
Verify the STO input wiring and the status of the safety circuit. If STO activation was unintended, inspect the safety relay or controller output driving the STO inputs. - Fault Code 122
- EtherNet/IP Communication Loss. The drive has lost communication with the EtherNet/IP controller or scanner.
Check Ethernet cable connections, switch/hub status, and IP address configuration. Verify the controller program and connection parameters. Restore network connectivity and reset the fault.
Frequently Asked Questions
What is the continuous output current and power rating of the 20G11FD022JA0NNNNN?
This PowerFlex 755 drive provides a continuous output current of 22 A, corresponding to an 11 kW (15 HP) motor rating at 400 V AC three-phase input.
Does this drive have an embedded EtherNet/IP port?
Yes, the PowerFlex 755 includes an embedded dual-port EtherNet/IP adapter as standard, allowing direct integration with Allen-Bradley Logix controllers without requiring an additional communication module.
What safety rating does the Safe Torque Off function on this drive meet?
The integrated Safe Torque Off (STO) function meets SIL 2 per IEC 62061 and Performance Level d (PLd) per EN ISO 13849-1, suitable for safety-related machine stopping applications.
Can this drive control permanent magnet motors as well as induction motors?
Yes, the PowerFlex 755 supports control of both AC induction motors and permanent magnet (PM) motors when using the appropriate control mode and feedback configuration.
What optional modules are compatible with this PowerFlex 755 drive?
The PowerFlex 755 accepts optional I/O expansion modules, feedback modules (for encoder and resolver inputs), and alternative communication adapters for protocols such as DeviceNet, Profibus DP, and ControlNet, installed in the drive's option module bays.
Troubleshooting
Drive trips on Fault Code 12 (HW OverCurrent) immediately upon starting
Measure insulation resistance of motor cables and motor windings to ground using a megohmmeter. Inspect output terminals for short circuits or damaged cable insulation.
Replace damaged motor cables or motor if insulation resistance is below acceptable limits. If wiring is intact, reduce the acceleration ramp time and verify that the motor nameplate data is correctly entered in the drive parameters.
Drive does not communicate with the Logix controller over EtherNet/IP
Check the drive's IP address via the HIM (Human Interface Module) or drive parameters. Verify Ethernet cable connections at the drive and network switch. Ping the drive IP address from the engineering workstation.
Correct any IP address conflicts or misconfiguration. Replace faulty Ethernet cables or patch cords. Ensure the controller's produced/consumed connection parameters match the drive's configuration in the I/O tree.
Motor runs but speed does not match the commanded reference
Verify the speed reference source parameter and confirm the analog or network reference signal level. Check for scaling errors in the speed reference parameters. If operating in closed-loop mode, verify encoder feedback wiring and signal integrity.
Correct speed reference scaling parameters. Inspect and reseat encoder feedback wiring. If encoder signals are noisy, use shielded cable with proper grounding. Perform an autotune procedure to re-characterize the motor.
Safe Torque Off (STO) fault activates unexpectedly during operation
Inspect the STO input wiring at the drive terminal block for loose connections or intermittent opens. Measure the voltage level at the STO input terminals during operation to confirm the safety circuit is maintaining the correct signal.
Tighten any loose STO terminal connections. Replace faulty safety relays or cables in the STO circuit. Verify that the safety controller output driving the STO inputs is functioning correctly and not dropping out due to a separate fault.
Drive powers up but the HIM display remains blank or shows no backlight
Check the DC bus voltage at the drive's internal power supply test points. Inspect the HIM connector and cable for damage or poor seating. Attempt to connect via Studio 5000 or DriveExplorer software over EtherNet/IP to determine if the drive control board is operational.
Reseat or replace the HIM module. If the drive responds via software but the HIM is blank, replace the HIM. If the drive does not respond at all, inspect the internal control power supply and replace the control board or drive as required.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|
Common defects
Common defects on a Allen-Bradley 20G11FD022JA0NNNNN 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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