Allen-Bradley 20F1AND186AA0NNNNN
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The Allen-Bradley 20F1AND186AA0NNNNN is a PowerFlex 700S series AC variable frequency drive manufactured by Allen-Bradley, a brand of Rockwell Automation. This unit belongs to the Phase II control architecture of the PowerFlex 700S family, designed for high-performance vector control of AC induction and permanent magnet motors. The SKU 20F1AND186AA0NNNNN encodes specific configuration details including a 480V AC input, 186A continuous output current rating, and a standard enclosure configuration suitable for panel or cabinet mounting.
The PowerFlex 700S drive features direct torque control (DTC) and field-oriented vector control modes, enabling precise speed and torque regulation without the need for encoder feedback in many applications, though encoder feedback is supported for closed-loop operation. The drive supports multiple communication options including DeviceNet, ControlNet, EtherNet/IP, and Profibus DP via interchangeable communication adapter modules. Integrated safety functions are available through the DriveGuard Safe-Off option, which provides SIL 2 / PLd-rated safe torque-off capability. The drive includes a robust gate driver design with advanced thermal management, and the control board supports DriveLogix embedded controller functionality for onboard PLC-style programming using Logix-based ladder logic.
The PowerFlex 700S at this power level is commonly deployed in heavy industrial applications such as extruders, winders, cranes, hoists, compressors, pumps, fans, and test stands where precise torque and speed control are critical. It is widely used in industries including oil and gas, metals and mining, pulp and paper, water and wastewater treatment, and automotive manufacturing. The drive's high current rating and advanced control architecture make it suitable for demanding processes where dynamic load changes and tight regulation tolerances are required.
Technical Specifications
| Series / Product Family | PowerFlex 700S Phase II |
|---|---|
| Input Voltage | 480V AC, 3-phase |
| Input Voltage Range | 342 – 528V AC |
| Input Frequency | 47 – 63 Hz |
| Output Current (Continuous) | 186 A |
| Power Rating (Approximate) | 132 kW (175 HP) at 480V |
| Control Type | Field-Oriented Vector Control / Direct Torque Control |
| Feedback Interface | Incremental encoder, resolver (via option card) |
| Communication Interface | DeviceNet, ControlNet, EtherNet/IP, Profibus DP (via adapter module) |
| Safety Features | DriveGuard Safe-Off (SIL 2 / PLd), Safe Torque-Off |
| Operating Temperature | 0 – 50 degrees C (with derating above 40 degrees C) |
| Storage Temperature | -40 – 70 degrees C |
| Relative Humidity | 5 – 95% non-condensing |
| IP / Protection Rating | IP00 / Open type (chassis) |
| Mounting | Cabinet / panel mount (chassis style) |
| Certifications | UL, cUL, CE, RCM |
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 external device or circuit connected to the auxiliary input terminals. Clear the external fault condition and reset the drive. - Fault Code 12
- HW OverCurrent fault. Hardware overcurrent detection has been triggered, indicating output current has exceeded the hardware current limit threshold.
Check for a short circuit or ground fault on the motor cables or motor windings. Verify motor load is within drive rating and check for mechanical overload. - Fault Code 13
- Ground Fault. Excessive current is flowing to ground, indicating insulation breakdown in the motor or output wiring.
Disconnect the motor and test insulation resistance of 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 due to excessive bus voltage.
Increase the deceleration time parameter, enable the bus voltage regulation feature, or install a dynamic braking resistor to absorb regenerative energy. - Fault Code 33
- Auto Restart Tries fault. The drive has exceeded the maximum number of automatic restart attempts following a fault condition.
Identify and correct the root cause of the recurring fault before manually resetting the drive. Review fault queue history for the underlying fault code. - Fault Code 71
- Adapter Communication Loss. The drive has lost communication with an installed peripheral communication adapter module.
Check the adapter module seating and connector integrity. Verify network cabling and master controller communication settings. Re-seat or replace the adapter module if necessary. - Fault Code 81
- Drive Overtemperature fault. The drive heatsink or internal temperature has exceeded the allowable operating limit.
Check that ambient temperature is within specification, verify cooling fans are operational, and ensure cabinet ventilation is unobstructed. Allow the drive to cool before restarting. - Fault Code 100
- Parameter Checksum fault. A checksum error has been detected in the drive parameter memory, indicating possible data corruption.
Reload parameters from a saved backup file using DriveExecutive or Studio 5000 software. If the fault persists, the control board memory may require replacement.
Frequently Asked Questions
What is the continuous output current rating of the 20F1AND186AA0NNNNN?
The 20F1AND186AA0NNNNN is rated for 186A continuous output current at 480V AC, corresponding to approximately 132 kW (175 HP) for normal duty applications.
What communication protocols does the PowerFlex 700S support?
The PowerFlex 700S supports EtherNet/IP, ControlNet, DeviceNet, and Profibus DP through interchangeable communication adapter modules that plug into the drive's peripheral expansion slot. The specific protocol depends on which adapter module is installed.
Does this drive support safe torque-off or safety functions?
Yes, the PowerFlex 700S supports the DriveGuard Safe-Off option, which provides SIL 2 and PLd-rated safe torque-off (STO) functionality. This allows the drive to be safely disabled without removing main power from the unit.
Can the PowerFlex 700S operate without encoder feedback?
Yes, the PowerFlex 700S can operate in sensorless vector control mode without encoder feedback for many applications. For high-precision speed or torque regulation, closed-loop operation with an incremental encoder or resolver is recommended.
What software is used to configure and program the PowerFlex 700S?
The PowerFlex 700S is configured using Rockwell Automation's DriveExecutive or Connected Components Workbench software. If the optional DriveLogix embedded controller is present, Studio 5000 Logix Designer is used for onboard PLC programming.
Troubleshooting
Drive faults immediately on enable with a ground fault or overcurrent fault
Disconnect the motor cables from the drive output terminals and megger-test the motor windings and cable insulation to ground. Check for phase-to-phase or phase-to-ground shorts in the output wiring.
Replace damaged motor cables or the motor if insulation resistance is below acceptable limits (typically less than 1 MOhm). If wiring and motor test acceptable, inspect the drive output IGBTs for damage using a diode test.
Drive displays overtemperature fault during normal operation
Measure ambient temperature inside the enclosure and verify it is within the 0-50 degrees C operating range. Check that all internal cooling fans are spinning and that heatsink fins are not blocked by dust or debris.
Clean heatsink fins with compressed air, replace failed cooling fans, and improve cabinet ventilation. If ambient temperature exceeds 40 degrees C, apply the manufacturer's derating curve to verify the drive is not being overloaded.
Loss of communication between the drive and the PLC or network master
Check the communication adapter module for secure seating in the drive's expansion slot. Verify network cable integrity, termination resistors, and node address settings on both the drive and the network master.
Re-seat the communication adapter module firmly. Replace network cables if damaged. Confirm IP address, node number, and baud rate settings match the network configuration. Update adapter firmware if a version mismatch is suspected.
Motor runs but speed does not match the commanded reference
Verify the speed reference source parameter is configured correctly and that the analog or digital reference signal is present and within the expected range. Check for parameter mismatches in the motor nameplate data entered into the drive.
Re-enter correct motor nameplate data (voltage, current, frequency, RPM, power) and perform an autotune routine. Verify the speed reference scaling parameters and confirm the commanded reference signal level at the drive input terminals.
Drive powers up but control panel or HIM shows no display or fails to communicate with the drive
Check the HIM connector and cable for damage or corrosion. Attempt to connect via DriveExecutive software over the serial or network port to determine if the drive control board is functional independently of the HIM.
Replace the HIM module or HIM cable if the drive responds normally via software. If the drive does not respond via software either, inspect the control board power supply voltages and consider replacing the control board.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|
Common defects
Common defects on a Allen-Bradley 20F1AND186AA0NNNNN 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
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