Allen-Bradley 20G11GD3P4AA0NNNNN

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SKU: 20G11GD3P4AA0NNNNN Category: Drive Brand: Allen-Bradley

The Allen-Bradley 20G11GD3P4AA0NNNNN is a PowerFlex 755 series AC variable frequency drive manufactured by Allen-Bradley, a brand of Rockwell Automation. This drive belongs to the PowerFlex 750-Series product family, which is designed for demanding industrial motion control and process applications requiring high performance and flexibility. The SKU 20G11GD3P4AA0NNNNN encodes specific configuration options including voltage class, current rating, enclosure type, and installed option modules as defined by Allen-Bradley's catalog numbering system.

The PowerFlex 755 drive features an embedded EtherNet/IP port as standard, enabling seamless integration into Logix-based control architectures without requiring an additional communication adapter. The drive supports multiple feedback types including incremental encoders and supports closed-loop vector control as well as open-loop V/Hz and sensorless vector control modes. It incorporates a modular option card architecture allowing installation of additional I/O, safety, feedback, and communication modules in its available option bays. The drive includes integrated safety functionality compatible with Safe Torque Off (STO) to SIL 2 / PLd when configured with the appropriate safety option, and features a graphical HIM (Human Interface Module) for local parameter configuration and diagnostics.

The PowerFlex 755 is widely deployed in industries such as oil and gas, mining, metals, pulp and paper, water and wastewater, and material handling. It is suited for applications including pumps, fans, compressors, conveyors, extruders, winders, and hoists where precise speed and torque control are required. The drive's scalable architecture and broad power range make it appropriate for both standalone machine-level installations and plant-wide integrated drive systems managed through a Logix controller environment.

Technical Specifications

Series / Product Family	PowerFlex 755 (PowerFlex 750-Series)
Input Voltage	600 V AC (3-phase)
Input Frequency	47 – 63 Hz
Output Current (Continuous)	3.4 A
Power Rating	2.2 kW (3 HP) at 600 V
Control Type	V/Hz, Sensorless Vector, Closed-Loop Vector
Communication Interface	EtherNet/IP (embedded), optional DeviceNet, PROFIBUS, ControlNet via option card
Feedback Interface	Incremental encoder (via option card), analog tachometer
Safety Features	Safe Torque Off (STO), SIL 2 / PLd capable with safety option
Enclosure / Protection Rating	IP20 / Open Type (Frame 1)
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
Mounting	Panel mount (wall mount)
Certifications	UL, cUL, CE, RCM
Number of Axes	1

Common Fault Codes

Fault Code 12: HW OverCurrent – The drive output current has exceeded the hardware overcurrent trip threshold, indicating a possible short circuit or excessive load.
Check motor wiring for short circuits or ground faults. Verify motor and load are not mechanically jammed. Inspect output power cables and motor insulation resistance.
Fault Code 13: Ground Fault – A current path to earth ground has been detected at the drive output, typically caused by damaged motor wiring or motor insulation failure.
Disconnect motor cables and measure insulation resistance to ground. Replace damaged cables or motor if insulation has failed. Check for moisture ingress in conduit or motor terminal box.
Fault Code 25: Decel Inhibit – The drive cannot decelerate at the programmed rate because the DC bus voltage has exceeded the overvoltage threshold, typically caused by regenerative energy from the load.
Increase deceleration time in drive parameters. Consider adding a dynamic braking resistor or an active front end. Verify bus voltage regulation parameters are correctly configured.
Fault Code 29: Analog Input Loss – The analog input signal has fallen below the configured loss threshold, indicating a broken wire or signal source failure.
Check wiring continuity on the analog input terminals. Verify the signal source (PLC analog output, transducer) is functioning. Confirm the analog input loss action parameter is set appropriately for the application.
Fault Code 33: Auto Restart Tries – The drive has exceeded the maximum number of automatic restart attempts following a fault without successfully running.
Identify and resolve the underlying fault that is causing repeated trips. Review the fault queue log on the HIM. Adjust auto-restart parameters or disable auto-restart until the root cause is corrected.
Fault Code 71: Power Loss – Input power to the drive has been lost or dropped below the acceptable threshold during operation.
Check incoming AC supply voltage at all three phases. Inspect fuses, circuit breakers, and contactor upstream of the drive. Verify supply voltage is within the drive's rated input voltage range.
Fault Code 81: Communication Loss – The drive has lost communication with the controlling device (e.g., PLC via EtherNet/IP or other network adapter), and the configured communication loss action has been triggered.
Check network cable connections and switch/hub status. Verify the controller is actively scanning the drive and the EtherNet/IP connection is established. Review communication loss action and timeout parameters in the drive configuration.
Fault Code 122: I/O Option Card Fault – An installed option card in one of the drive's option bays has reported a fault or has been removed unexpectedly during operation.
Power down the drive and reseat the option card firmly in its bay. Inspect the card and connector for damage or contamination. Replace the option card if the fault persists after reseating.

Frequently Asked Questions

What input voltage and power rating does the 20G11GD3P4AA0NNNNN correspond to?

The catalog number 20G11GD3P4AA0NNNNN decodes to a 600 V AC three-phase input drive rated at approximately 2.2 kW (3 HP) with a continuous output current of 3.4 A. This places it in the lower end of the PowerFlex 755 power range.

Does the PowerFlex 755 support EtherNet/IP communication natively?

Yes, the PowerFlex 755 includes an embedded dual-port EtherNet/IP adapter as standard, allowing direct connection to a Logix-based control system without an additional communication option card. The dual-port design also supports linear and Device Level Ring (DLR) network topologies.

Can the PowerFlex 755 perform closed-loop vector control?

Yes, the PowerFlex 755 supports closed-loop vector control when a compatible encoder feedback option card is installed. It also supports open-loop sensorless vector and V/Hz control modes without a feedback device.

What safety functionality is available on the PowerFlex 755?

The PowerFlex 755 supports Safe Torque Off (STO) functionality. With the appropriate safety option module installed, it can achieve SIL 2 and PLd safety ratings in accordance with IEC 62061 and ISO 13849-1 respectively.

Is the PowerFlex 755 compatible with Rockwell Automation Studio 5000 Logix Designer?

Yes, the PowerFlex 755 is fully integrated with Studio 5000 Logix Designer and supports Add-On Profiles (AOPs) for simplified configuration and commissioning within a Logix controller project. This enables tag-based parameter access directly from the controller program.

Troubleshooting

Drive trips on overcurrent fault immediately upon start command

Measure output phase currents with a clamp meter during the start attempt. Check motor wiring for phase-to-phase or phase-to-ground shorts using an insulation resistance tester. Verify motor nameplate data matches drive parameter settings for motor rated current and voltage.

Correct any wiring faults or insulation failures. Ensure motor parameters (rated current, voltage, frequency) are correctly entered in the drive. If the motor is healthy, increase the current limit or acceleration time parameters to reduce inrush during starting.

Drive powers up but HIM display shows no communication with option cards

Power down the drive and inspect all option card slots for proper seating. Check for bent pins or contamination on the card edge connectors. Review the drive's option card configuration parameters to confirm the expected cards are recognized.

Reseat all option cards firmly and ensure locking tabs are engaged. Clean connectors with appropriate contact cleaner if contamination is present. Replace any option card that is not recognized after reseating, as the card may have an internal failure.

EtherNet/IP communication loss fault occurs intermittently during operation

Check the network cable connections at the drive's embedded EtherNet/IP port and at the network switch. Monitor network traffic for excessive collisions or bandwidth saturation. Verify the drive's IP address configuration and confirm there are no IP address conflicts on the network.

Replace suspect Ethernet cables and ensure connectors are properly crimped. Isolate the drive network from high-traffic segments using a managed switch with QoS settings. Adjust the communication loss timeout parameter in the drive if brief network interruptions are causing nuisance faults.

Motor runs but speed does not match the commanded reference

Verify the speed reference source parameter is set correctly (e.g., EtherNet/IP, analog input, or internal preset). Check the analog input signal level at the drive terminals if using an analog reference. Confirm that speed scaling parameters and minimum/maximum speed limits are configured correctly.

Correct the speed reference source parameter to match the intended control method. Calibrate the analog input signal if drift or offset is detected. Adjust speed scaling parameters so that the commanded reference maps correctly to the desired output frequency range.

Drive runs hot and triggers thermal overload fault during normal load conditions

Check ambient temperature at the drive installation location and compare against the rated operating temperature. Inspect the drive's heatsink and cooling fan for dust accumulation or fan failure. Verify that the drive enclosure has adequate ventilation clearances as specified in the installation manual.

Clean the heatsink fins and replace the cooling fan if it is not operating at full speed. Ensure minimum clearances above and below the drive are maintained. If ambient temperature exceeds 40 degrees C, apply the appropriate derating factor or improve enclosure ventilation or air conditioning.

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

Common defects

Common defects on a Allen-Bradley 20G11GD3P4AA0NNNNN 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