Allen-Bradley 20G14ND415AN0NNNNN

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SKU: 20G14ND415AN0NNNNN Category: Drive Brand: Allen-Bradley

The Allen-Bradley 20G14ND415AN0NNNNN 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 PowerFlex 755 is engineered for three-phase AC induction and permanent magnet motor control, offering advanced drive capabilities in a scalable architecture.

The 20G14ND415AN0NNNNN is rated for 415 A output current in a 480 V AC input configuration, placing it in the high-power range suitable for large motor loads. It supports multiple control modes including sensorless vector, closed-loop vector, and volts-per-hertz control, providing flexibility across motor types and application demands. The drive features an embedded EtherNet/IP port as standard, enabling seamless integration into Logix-based control architectures, and supports additional option card slots for protocols such as DeviceNet, PROFIBUS DP, and ControlNet. Safety functions including Safe Torque Off (STO) are available via option modules, and the drive supports a broad range of feedback devices including incremental encoders and resolvers through dedicated feedback option cards.

The PowerFlex 755 at this power rating is commonly deployed in heavy industrial applications such as mining conveyors, large pump and fan systems, compressors, extruders, and material handling equipment. It is well suited for the oil and gas, water and wastewater, metals and mining, and pulp and paper industries where high continuous output current, robust thermal management, and reliable network integration are critical requirements. The scalable option card architecture allows the drive to be configured precisely for the control, feedback, and safety requirements of each specific application.

Technical Specifications

Series / Product Family	PowerFlex 755 (PowerFlex 750-Series)
Input Voltage	480 V AC, 3-phase
Input Voltage Range	342 – 528 V AC
Input Frequency	47 – 63 Hz
Output Current (Continuous)	415 A
Power Rating	Approx. 250 kW (335 HP) at 480 V
Control Type	Sensorless Vector, Closed-Loop Vector, V/Hz
Communication Interface	Embedded EtherNet/IP; option cards for DeviceNet, PROFIBUS DP, ControlNet
Feedback Interface	Incremental encoder, resolver, and others via option cards
Safety Features	Safe Torque Off (STO) via option module (SIL 2 / PLd capable)
Option Card Slots	Multiple expansion slots for I/O, feedback, and communication cards
Enclosure / Protection Rating	IP20 (open type)
Operating Temperature	0 – 50 °C (derating may apply above 40 °C)
Storage Temperature	-40 – 70 °C
Relative Humidity	5 – 95% non-condensing
Certifications	UL, cUL, CE, RCM
Mounting	Cabinet / panel mount (floor-standing frame)

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 3: Power Loss fault. DC bus voltage dropped below the minimum threshold, indicating a loss or significant sag of input AC power.
Verify input AC supply voltage is within specification (342–528 V AC). Check input fuses, contactors, and supply cabling. Restore supply and reset the drive.
Fault Code 4: Undervoltage fault. DC bus voltage is below the minimum operating level during run.
Measure input line voltage at the drive terminals. Check for voltage sags, loose connections, or undersized supply. Correct the supply issue and reset.
Fault Code 5: Overvoltage fault. DC bus voltage has exceeded the maximum allowable level, typically caused by regenerative energy from the motor during deceleration.
Increase deceleration time, add a dynamic braking resistor or active front end, and verify the supply voltage is not above specification. Reset the drive after correcting the condition.
Fault Code 7: Motor Overload fault. The drive's electronic overload protection has detected sustained overcurrent indicating the motor is thermally overloaded.
Check motor load for mechanical binding or excessive load. Verify motor nameplate data matches drive parameter settings. Allow the motor to cool and reset the drive.
Fault Code 12: HW Overcurrent fault. Output current has exceeded the hardware overcurrent trip level, which is above the software overcurrent limit.
Check for a short circuit or ground fault on the output wiring or motor windings. Inspect output cables and motor insulation. Clear the fault and reset after correcting the wiring issue.
Fault Code 29: Analog Input Loss fault. An analog input configured for a 4–20 mA signal has dropped below 2 mA, indicating a broken wire or failed signal source.
Check the analog signal source, wiring continuity, and connections at the drive's I/O terminals. Restore the signal or reconfigure the analog input loss action parameter.
Fault Code 71: Overtemperature fault. The drive's heatsink or internal temperature has exceeded the allowable limit.
Check that ambient temperature is within specification, cooling fans are operational, and air filters are not blocked. Allow the drive to cool, clear obstructions, and reset.

Frequently Asked Questions

What is the continuous output current rating of the 20G14ND415AN0NNNNN?

The 20G14ND415AN0NNNNN is rated for 415 A continuous output current at 480 V AC, corresponding to approximately 250 kW (335 HP) for a standard duty application.

What communication protocols does the PowerFlex 755 20G14ND415AN0NNNNN support?

The drive includes an embedded EtherNet/IP port as standard. Additional protocols such as DeviceNet, PROFIBUS DP, ControlNet, and others can be added via optional communication cards installed in the drive's expansion slots.

Does this drive support Safe Torque Off (STO) safety functionality?

Yes, Safe Torque Off (STO) is available on the PowerFlex 755 through a dedicated safety option card. When properly configured, this can achieve SIL 2 / PLd safety ratings in accordance with IEC 62061 and ISO 13849-1.

What motor control modes are available on the PowerFlex 755?

The PowerFlex 755 supports Volts-per-Hertz (V/Hz), Sensorless Vector Control, and Closed-Loop Vector Control modes, making it compatible with standard AC induction motors and permanent magnet motors depending on the firmware and option cards installed.

Can the PowerFlex 755 be integrated with a Rockwell Automation Logix control system?

Yes, the embedded EtherNet/IP port allows direct integration with Allen-Bradley ControlLogix and CompactLogix controllers using Add-On Profiles (AOPs) in Studio 5000 Logix Designer, enabling seamless parameter configuration and real-time diagnostics.

Troubleshooting

Drive trips on Fault Code 7 (Motor Overload) repeatedly under normal load conditions

Compare the motor nameplate FLA (full load amps) against the motor rated current parameter in the drive. Check if the overload class setting matches the motor type. Measure actual output current with a clamp meter.

Correct the motor rated current and overload class parameters to match the motor nameplate data. If the motor is genuinely overloaded, investigate the mechanical load for binding or excessive friction.

Drive displays Fault Code 71 (Overtemperature) and shuts down

Inspect the cooling fans on the drive heatsink for operation and direction of airflow. Check air inlet and outlet filters for blockage. Measure ambient temperature inside the enclosure.

Clean or replace blocked air filters, ensure enclosure ventilation is adequate, and verify ambient temperature does not exceed 50 °C. Replace faulty cooling fans if they are not spinning or are running at reduced speed.

EtherNet/IP communication loss between the drive and the PLC

Check the drive's embedded EtherNet/IP port link status LEDs. Verify IP address configuration in the drive parameters matches the network topology. Use a network switch diagnostic tool to check for packet loss or duplex mismatch.

Confirm the drive IP address, subnet mask, and gateway settings are correct. Ensure the network switch port is set to auto-negotiate or matches the drive port settings. Replace the Ethernet cable if physical damage is found.

Drive powers up but motor does not rotate when a run command is issued

Verify the drive is not in a faulted or inhibited state by checking the HIM (Human Interface Module) display. Confirm the run command source parameter matches the actual command source (terminal block, network, or HIM). Check that the speed reference is non-zero.

Clear any active faults and check that all enable and permissive inputs are satisfied. Verify the control source and reference source parameters are configured correctly for the application wiring. Check output terminal wiring to the motor.

Drive output current is unstable or motor runs with excessive vibration

Check if the drive is operating in closed-loop vector mode and whether the encoder feedback signal is clean and correctly wired. Inspect encoder cable shielding and grounding. Review the drive's current regulator and speed regulator gain parameters.

Ensure encoder cable shield is grounded at one end only (drive end) and routed away from power cables. Re-tune the speed and current regulator gains using the drive's autotune function. If operating in sensorless vector mode, verify motor nameplate parameters are accurately entered.

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

Common defects

Common defects on a Allen-Bradley 20G14ND415AN0NNNNN 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