Allen-Bradley 20P41AD073RA0NNN

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SKU: 20P41AD073RA0NNN Category: Drive Brand: Allen-Bradley

The Allen-Bradley 20P41AD073RA0NNN is a PowerFlex 700S Phase II AC variable frequency drive manufactured by Allen-Bradley, a brand of Rockwell Automation. This unit belongs to the high-performance PowerFlex 700S series, designed for demanding vector control applications requiring precise speed and torque regulation. The 700S series is engineered for applications where dynamic response, high accuracy, and advanced motor control are critical requirements.

The 20P41AD073RA0NNN is a 400V class drive rated at 73 amps continuous output current, corresponding to approximately 37 kW (50 HP) at 480V AC input. It supports Direct Vector Control (DVC) with or without encoder feedback, enabling high-bandwidth torque and speed regulation. The drive features DriveLogix integration capability, allowing an embedded Logix processor to reside within the drive for coordinated motion and process control. Communication options include compatibility with various network adapters supporting EtherNet/IP, ControlNet, DeviceNet, and Profibus, and the unit includes advanced safety architecture support for Safe Torque Off (STO) functionality.

The PowerFlex 700S drive is widely deployed in industries such as oil and gas, metals and mining, pulp and paper, and material handling, where high dynamic performance and precise torque control are essential. It is commonly used on applications including winders, extruders, cranes, hoists, and test stands where coordinated multi-axis control or tight speed regulation is required. The drive's ability to operate in both open-loop and closed-loop vector modes makes it adaptable across a broad range of motor control scenarios.

Technical Specifications

Series/Product Family	PowerFlex 700S Phase II
Input Voltage	380 – 480V AC, 3-phase
Input Frequency	47 – 63 Hz
Output Current (Continuous)	73 A
Power Rating	37 kW (50 HP) at 480V
Output Voltage	0 – Input Voltage (3-phase)
Control Type	Direct Vector Control (DVC), open-loop and closed-loop
Feedback Interface	Incremental encoder, resolver (via option card)
Communication Interface	EtherNet/IP, ControlNet, DeviceNet, Profibus (via adapter modules)
Safety Features	Safe Torque Off (STO), hardwired safety input
Operating Temperature	0 – 50 degrees C (derating required above 40 degrees C)
Storage Temperature	-40 – 70 degrees C
Relative Humidity	5 – 95% non-condensing
IP/Protection Rating	IP20 (open type enclosure)
Mounting	Panel mount, bookshelf or floor-standing cabinet
Certifications	UL, cUL, CE, C-Tick

Common Fault Codes

Fault Code 2: Auxiliary input fault. The auxiliary input interlock has opened, indicating an external fault condition has been signaled to the drive.
Check the wiring and status of the auxiliary input terminals. Verify that any external safety or interlock devices connected to the auxiliary input are functioning correctly and that the circuit is closed before attempting a reset.
Fault Code 12: Hardware overcurrent fault. The drive output current has exceeded the hardware overcurrent trip threshold.
Check for a short circuit or ground fault on the output wiring or motor. Verify motor insulation resistance. Inspect drive output power devices. Reduce load or acceleration rate if the motor is being overloaded.
Fault Code 13: Ground fault detected. Excessive current is flowing to ground on the drive output.
Disconnect the motor and output wiring and perform an insulation resistance test on the motor windings and output cables. Replace damaged cables or motor if insulation failure is confirmed.
Fault Code 25: Decel inhibit fault. The drive is unable to decelerate within the programmed deceleration time, typically due to excessive regenerative energy.
Increase the deceleration time parameter, enable the bus voltage regulation feature, or install a dynamic braking resistor to absorb regenerative energy during deceleration.
Fault Code 33: Auto-tune fault. The auto-tuning procedure did not complete successfully.
Verify that the motor is disconnected from the load if possible, check motor nameplate data entered into the drive parameters, and ensure the motor is not at a thermal limit. Retry the auto-tune procedure.
Fault Code 71: Adapter communication loss. The drive has lost communication with a connected peripheral or network adapter module.
Check the adapter module seating and connection in the drive. Inspect network cabling and verify network configuration parameters. Replace the adapter module if the fault persists after reseating.
Fault Code 81: Encoder loss fault. The drive has detected a loss of encoder signal when operating in closed-loop vector mode.
Check encoder wiring for continuity, correct shielding, and secure connections at both the encoder and the drive feedback card. Verify encoder supply voltage. Replace the encoder or feedback option card if wiring is confirmed good.
Fault Code 100: Parameter checksum fault. The drive has detected a mismatch or corruption in stored parameter data.
Reload parameters from a saved backup if available. If no backup exists, reset the drive to factory defaults and reprogram all parameters. If the fault recurs, the drive control board may require replacement.

Frequently Asked Questions

What is the continuous output current rating of the 20P41AD073RA0NNN?

The 20P41AD073RA0NNN is rated for 73 amps continuous output current, corresponding to approximately 37 kW (50 HP) when used with a 480V AC three-phase supply.

Does this drive support closed-loop vector control with encoder feedback?

Yes, the PowerFlex 700S Phase II supports closed-loop Direct Vector Control (DVC) with encoder feedback via an optional feedback option card. This enables high-bandwidth speed and torque regulation suitable for demanding servo-like applications.

What communication networks are compatible with this drive?

The drive supports multiple communication networks through plug-in adapter modules, including EtherNet/IP, ControlNet, DeviceNet, and Profibus DP. The specific network depends on which communication adapter is installed in the drive.

Can the 20P41AD073RA0NNN be integrated with a Rockwell Automation Logix controller?

Yes, the PowerFlex 700S Phase II is designed for tight integration with Rockwell Automation Logix platforms. It also supports the optional DriveLogix embedded controller, which allows a Logix processor to reside inside the drive itself for coordinated control.

Is Safe Torque Off (STO) functionality available on this drive?

Yes, the PowerFlex 700S Phase II includes a hardwired Safe Torque Off input that disables the drive output without removing main power, supporting safety system integration in accordance with applicable safety standards.

Troubleshooting

Drive faults immediately on enable with a hardware overcurrent fault

Measure insulation resistance of the motor windings and output power cables to ground using a megohmmeter. Check for any phase-to-phase or phase-to-ground short circuits at the drive output terminals.

Replace damaged motor cables or the motor if insulation failure is found. If wiring and motor are healthy, inspect the drive output IGBT modules for damage. A failed output power device will require drive repair or replacement of the power stage.

Drive displays encoder loss fault in closed-loop mode

Inspect encoder cable for physical damage, correct shielding, and secure termination at both the encoder body and the drive feedback option card. Verify the encoder supply voltage at the feedback card connector is within specification.

Re-terminate or replace the encoder cable if damaged or improperly shielded. If the cable is good, substitute a known-working encoder to isolate whether the encoder itself or the feedback option card is faulty. Replace the defective component.

Communication loss fault with network adapter module

Check that the adapter module is fully seated in the drive option slot and that the network cable is securely connected. Verify network configuration parameters in the drive match the network settings (node address, baud rate, IP address as applicable).

Reseat the adapter module firmly. Correct any network configuration parameter mismatches. If the fault persists, swap the adapter module with a known-good unit to determine if the adapter has failed and replace if confirmed faulty.

Motor runs but speed regulation is poor or unstable in vector mode

Verify that motor nameplate data (voltage, current, frequency, RPM, power factor) has been entered correctly into the drive parameters. Check whether the auto-tune procedure has been completed successfully for the connected motor.

Correct any motor nameplate parameter entries and re-run the static and rotational auto-tune procedures. If using closed-loop control, verify encoder pulses-per-revolution parameter matches the installed encoder. Adjust speed regulator bandwidth parameters if instability persists after tuning.

Drive does not power up and no status LEDs illuminate

Measure the incoming AC supply voltage at the drive input terminals to confirm all three phases are present and within the specified 380-480V AC range. Check for blown input fuses or tripped upstream circuit breaker.

Restore the correct input supply voltage and replace any blown input fuses with correctly rated replacements. If supply voltage and fuses are confirmed good but the drive remains dead, the internal power supply or control board may have failed and will require professional repair or replacement.

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

Common defects

Common defects on a Allen-Bradley 20P41AD073RA0NNN 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