Allen-Bradley 20G11RD5P0AA0NNNNN

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SKU: 20G11RD5P0AA0NNNNN Category: Drive Brand: Allen-Bradley

The Allen-Bradley 20G11RD5P0AA0NNNNN 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, which is designed for demanding industrial motor control applications requiring high performance and flexibility. The SKU 20G11RD5P0AA0NNNNN identifies a specific configuration within the PowerFlex 755 product family, offering a defined power rating, voltage class, and option set suited for three-phase AC motor control.

The PowerFlex 755 series features an embedded EtherNet/IP communication port as standard, enabling seamless integration into Logix-based control architectures without the need for additional communication modules. The drive supports a wide range of optional I/O, safety, and feedback modules that can be inserted into its option bay slots, allowing configuration for Safe Torque Off (STO) and other safety functions compliant with SIL 2 and PLe requirements. Advanced motor control algorithms including Sensorless Vector Control and Closed Loop Vector Control are supported, providing precise speed and torque regulation. The drive also incorporates a real-time clock, non-volatile memory for parameter storage, and a graphical HIM (Human Interface Module) for local configuration and diagnostics.

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 variable speed operation and process control are required. The drive's modular architecture and broad power range make it suitable for both standalone machine-level installations and large integrated process control systems.

Technical Specifications

Series / Product Family	PowerFlex 755
Input Voltage	600 V AC (3-phase)
Output Current (Continuous)	5.0 A
Power Rating	3.0 kW (4 hp) at 600 V
Control Type	Sensorless Vector Control / Closed Loop Vector Control / V/Hz
Communication Interface	Embedded EtherNet/IP (dual-port)
Safety Features	Safe Torque Off (STO), SIL 2 / PLe capable (with safety option module)
Feedback Interface	Encoder / resolver feedback via optional feedback module
Operating Temperature	0 to 50 degrees C (derating may apply above 40 degrees C)
Storage Temperature	-40 to 70 degrees C
Relative Humidity	5 to 95% non-condensing
IP / Protection Rating	IP20 (open type enclosure)
Mounting	Panel mount (bookshelf or flat)
Certifications	UL, cUL, CE, RCM
Option Bay Slots	2 option module slots (I/O, feedback, safety, communication)

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 load is within drive rating. Inspect output wiring and motor insulation.
Fault Code 13: Ground Fault. Excessive current is flowing from one or more output phases to ground.
Disconnect the motor and test insulation resistance of motor windings and cables. Replace damaged cables or motor if insulation breakdown is confirmed.
Fault Code 25: Decel Inhibit fault. The drive cannot decelerate at the programmed rate because the DC bus voltage has exceeded the overvoltage threshold.
Increase the deceleration time, enable the bus voltage regulation feature, or install a dynamic braking resistor to dissipate regenerative energy.
Fault Code 29: Analog Input Loss. An analog input signal has fallen below the configured loss-of-signal threshold (e.g., 4 mA signal lost on a 4-20 mA input).
Check the analog signal source, wiring connections, and signal levels at the drive terminals. Verify the transmitter or controller providing the signal is functioning 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: Power Loss fault. Input power to the drive was lost or dropped below the acceptable threshold during operation.
Check incoming supply voltage at all three phases. Inspect fuses, contactors, and supply wiring. Verify the power source is stable and within specification.
Fault Code 122: Motor Overtemperature fault. The motor thermal model or a connected PTC/NTC thermistor has indicated the motor has exceeded its thermal limit.
Allow the motor to cool before restarting. Check motor ventilation, load conditions, and ambient temperature. Verify thermistor wiring if a hardware temperature sensor is used.

Frequently Asked Questions

What is the input voltage and power rating of the 20G11RD5P0AA0NNNNN?

This PowerFlex 755 variant is configured for a 600 V AC three-phase input with a continuous output current of 5.0 A, corresponding to approximately 3.0 kW (4 hp) at 600 V.

What communication protocols does the PowerFlex 755 support?

The PowerFlex 755 includes an embedded dual-port EtherNet/IP interface as standard. Additional protocols such as DeviceNet, PROFIBUS DP, ControlNet, and Modbus TCP can be supported via optional communication modules installed in the option bays.

Can the PowerFlex 755 be used with encoder feedback for closed-loop speed control?

Yes, the PowerFlex 755 supports closed-loop vector control with encoder or resolver feedback. A compatible feedback option module must be installed in one of the drive's option bay slots to connect the feedback device.

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

Yes, the PowerFlex 755 is designed for seamless integration with Allen-Bradley Logix-based controllers via EtherNet/IP. Add-On Profiles (AOPs) are available in Studio 5000 Logix Designer for simplified configuration and commissioning.

What safety functions are available on the PowerFlex 755?

The PowerFlex 755 supports Safe Torque Off (STO) as a base safety function. Additional safety functions including Safe Stop, Safe Speed Monitor, and others compliant with SIL 2 and PLe can be enabled by installing a compatible safety option module.

Troubleshooting

Drive does not power up and the HIM display remains blank

Measure incoming three-phase supply voltage at the drive input terminals L1, L2, and L3. Check internal DC bus voltage using a multimeter at the DC bus test points. Inspect the internal pre-charge circuit and control power supply.

Restore correct input voltage if supply is absent or out of range. If supply is correct but drive does not power up, inspect and replace blown input fuses or the internal power supply board. Verify the control power wiring if a separate 24 V control supply is used.

Drive trips on Ground Fault (Fault Code 13) immediately at start

Disconnect the motor cables from the drive output terminals (T1, T2, T3) and perform an insulation resistance test on the motor windings and cables using a megohmmeter at 500 V or 1000 V DC.

If insulation resistance is below 1 MOhm, replace the damaged motor cable or motor. If insulation is acceptable with cables disconnected, reconnect cables and test each phase individually to isolate the fault location.

Drive runs but motor speed is unstable or oscillating

Check the analog reference signal at the drive input terminals for noise or signal fluctuation using an oscilloscope. Verify encoder feedback wiring and shielding if operating in closed-loop mode. Review motor nameplate data entered in drive parameters.

Shield and separate analog signal cables from power cables. Verify encoder cable shielding is grounded at one end only. Run the drive autotune procedure to correctly identify motor parameters and improve control stability.

EtherNet/IP communication loss between drive and PLC

Check the link status LEDs on the drive's embedded EtherNet/IP port. Verify IP address configuration on the drive matches the expected address in the PLC program. Check network switch port status and cable integrity.

Reconfigure the drive IP address using the HIM or Rockwell Automation tools such as RSLinx or Studio 5000. Replace the Ethernet cable if physical damage is found. Ensure the network switch port is active and not in an error state.

Drive overheats and trips on thermal fault during operation

Check the ambient temperature around the drive enclosure and verify that the drive's cooling fan is operating. Inspect the heatsink fins for dust or debris blockage. Verify that the load current does not exceed the drive's continuous output current rating.

Clean the heatsink and cooling fan. Improve enclosure ventilation or add forced air cooling if ambient temperature exceeds 40 degrees C. Reduce the load or apply derating if operating above the rated temperature. Replace the cooling fan if it is not spinning.

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

Common defects

Common defects on a Allen-Bradley 20G11RD5P0AA0NNNNN 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