Allen-Bradley 20G11NE041JA0NNNNN

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SKU: 20G11NE041JA0NNNNN Category: Drive Brand: Allen-Bradley

The Allen-Bradley 20G11NE041JA0NNNNN 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 20G11NE041JA0NNNNN encodes specific configuration details including voltage class, enclosure type, output current rating, and installed option modules.

The PowerFlex 755 drive in this configuration operates on a 480V AC three-phase input and delivers a continuous output current of 41 A, corresponding to approximately 25 HP at 480V. It features an embedded EtherNet/IP communication port as indicated by the 'E' in the catalog string, enabling direct integration with Logix-based control systems without requiring an additional communication module. The drive supports multiple feedback types including incremental and absolute encoders, and includes advanced motor control algorithms such as Sensorless Vector Control and Closed Loop Vector Control. The PowerFlex 755 architecture supports a modular option card system, allowing installation of I/O, feedback, and safety option modules in dedicated slots.

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 particularly suited for applications requiring precise speed and torque control, such as conveyors, pumps, fans, compressors, extruders, and hoists. The drive's scalable architecture and native EtherNet/IP connectivity make it well suited for integration into modern Plant PAx and Studio 5000 Logix Designer control environments.

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)	41 A
Power Rating	25 HP (18.5 kW) at 480V
Output Frequency Range	0 – 500 Hz
Communication Interface	EtherNet/IP (embedded)
Control Type	Sensorless Vector, Closed Loop Vector, V/Hz
Feedback Interface	Incremental Encoder, Absolute Encoder (via option module)
Enclosure Type	IP20 / NEMA Type 1
Operating Temperature	0 – 50 degrees C (with derating above 40 degrees C)
Storage Temperature	-40 – 70 degrees C
Relative Humidity	5 – 95% non-condensing
Certifications	UL, cUL, CE, RCM
Mounting	Panel Mount / Bookcase

Common Fault Codes

Fault Code 12: HW OverCurrent – The drive output current has exceeded the hardware overcurrent trip level.
Check for a short circuit or ground fault on the output wiring. Verify motor insulation resistance. Inspect for a seized or mechanically overloaded motor. Reduce acceleration rate if the fault occurs during ramp-up.
Fault Code 13: Ground Fault – A current path to earth ground has been detected in the output circuit.
Disconnect the motor and test insulation resistance with a megohmmeter. Inspect output wiring for damaged insulation. Check motor windings for ground faults. Replace motor or wiring as required.
Fault Code 25: Decel Inhibit – The drive is unable to decelerate at the programmed rate due to excessive bus voltage.
Enable the bus voltage regulation feature or install a dynamic braking resistor. Increase the deceleration time in the drive parameters. Verify that the braking resistor (if installed) is correctly sized and connected.
Fault Code 29: Analog Input Loss – An analog input signal has fallen below the configured loss threshold.
Check the analog signal wiring for open circuits or loose connections. Verify the signal source is active and within the configured range. Review the analog input loss action parameter and adjust if necessary.
Fault Code 33: Motor Stalled – The motor has stalled or is unable to accelerate to the commanded speed within the stall timeout period.
Check for excessive mechanical load or a seized motor. Verify motor nameplate data entered in drive parameters. Increase the stall fault time parameter or reduce the load. Inspect the driven machine for mechanical binding.
Fault Code 71: Power Loss – An input power loss or brownout condition has been detected.
Check input supply voltage at the drive terminals for all three phases. Verify that input fuses or circuit breakers are intact. Inspect input wiring connections for looseness or corrosion. Confirm the supply voltage is within the drive's specified input range.
Fault Code 81: Communication Loss – The drive has lost communication with the controlling network device (e.g., EtherNet/IP scanner).
Check the EtherNet/IP cable connections at the drive and the network switch. Verify the controller is in Run mode and the connection is configured correctly in Studio 5000. Review the communication fault action parameter to determine drive behavior on loss of communication.
Fault Code 122: Motor Overtemperature – The motor thermal model or PTC/thermistor input has indicated an overtemperature condition.
Allow the motor to cool before restarting. Check that the motor cooling fan is operational. Verify the motor thermal model parameters match the motor nameplate data. Inspect for excessive ambient temperature or blocked ventilation around the motor.

Frequently Asked Questions

What is the output current rating of the 20G11NE041JA0NNNNN?

The 20G11NE041JA0NNNNN has a continuous output current rating of 41 A, which corresponds to a 25 HP (18.5 kW) motor at 480V AC.

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. No additional communication option module is required for EtherNet/IP connectivity.

Is this drive compatible with Studio 5000 Logix Designer and Add-On Profiles?

Yes, the PowerFlex 755 is fully supported in Studio 5000 Logix Designer via the PowerFlex 755 Add-On Profile (AOP), which simplifies configuration and commissioning within a Logix-based control system.

Can this drive be used for closed-loop vector control with an encoder?

Yes, the PowerFlex 755 supports closed-loop vector control. An encoder feedback option module must be installed in one of the drive's option card slots to provide encoder feedback for closed-loop operation.

What safety functions are available on the PowerFlex 755?

The PowerFlex 755 supports Safe Torque Off (STO) as a standard safety function via an optional safety option module. Additional safety functions such as Safe Stop and Safe Speed Monitoring are available depending on the installed safety option card.

Troubleshooting

Drive displays a Ground Fault (Fault Code 13) immediately on enable

Disconnect the motor cables from the drive output terminals T1, T2, T3 and attempt to run the drive unloaded. If the fault clears, the issue is in the motor or output wiring. Use a megohmmeter to test insulation resistance of the motor windings and output cables to earth.

Replace damaged output cables or the motor if insulation resistance is below acceptable limits (typically greater than 1 MOhm at 500V DC). Ensure cable shields are grounded at one end only and that there are no nicked or pinched conductors.

Drive powers up but EtherNet/IP communication cannot be established

Verify the drive IP address using the integral HIM or drive parameters. Check that the IP address, subnet mask, and gateway are correctly configured and match the network topology. Inspect the Ethernet cable and port LEDs on the drive for link activity.

Reconfigure the IP address settings using the HIM or BootP/DHCP tool. Replace the Ethernet cable if no link LED is present. Confirm the controller's I/O configuration in Studio 5000 matches the drive's IP address and that the controller is in Run mode.

Drive trips on OverCurrent (Fault Code 12) during acceleration

Review the acceleration time parameter and compare the motor nameplate current to the drive's output current rating. Check for mechanical overload on the driven equipment by uncoupling the load and running the motor unloaded.

Increase the acceleration time (Accel Time 1 parameter) to reduce the rate of current rise. Verify motor nameplate data is correctly entered in the drive parameters. If the fault persists with no load, inspect the output IGBTs for damage and check for wiring faults between the drive and motor.

Drive runs but motor speed is unstable or hunting

Check the speed reference source and verify the analog input signal (if used) is stable and free of electrical noise. Review the control mode parameter to confirm the correct motor control algorithm is selected. If closed-loop vector control is active, verify encoder wiring and feedback signal integrity.

Shield and separate analog signal wiring from power cables. Adjust the speed regulator bandwidth and PI gains in the drive parameters. If using encoder feedback, verify the encoder PPR setting matches the physical encoder and inspect the encoder cable for damage or loose connections.

Drive does not respond to start command

Check the drive status on the HIM display for any active faults or inhibits. Verify that the control source (terminal block, HIM, or network) matches the configured control mode parameter. Confirm that the enable input (if wired) is active and that the drive is not in a faulted or inhibited state.

Clear any active faults by pressing the Stop/Reset button on the HIM or issuing a fault reset via the network. Verify the Start Inhibits parameter to identify which condition is preventing the start command. Confirm all required digital inputs (Enable, Run, Direction) are correctly wired and active.

Condition	Repair, Used, Refurbished, New in box (sealed)

Common defects

Common defects on a Allen-Bradley 20G11NE041JA0NNNNN 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