Allen-Bradley 20BD8P0A0AYNANC0
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The Allen-Bradley 20BD8P0A0AYNANC0 is a PowerFlex 700 series AC variable frequency drive manufactured by Allen-Bradley, a brand of Rockwell Automation. This drive is designed to provide precise speed and torque control for three-phase AC induction motors, operating on a 400-480V AC input with a continuous output current rating of 8.0A. The PowerFlex 700 series is a general-purpose drive platform widely deployed across industrial automation applications requiring reliable motor control.
The 20BD8P0A0AYNANC0 features a standard control architecture supporting both volts-per-hertz (V/Hz) and sensorless vector control modes, enabling flexible motor management without the need for encoder feedback in most applications. The drive includes an embedded Human Interface Module (HIM) interface port and supports optional communication adapter cards for protocols such as EtherNet/IP, DeviceNet, ControlNet, and Profibus DP, allowing integration into various control network architectures. Built-in protective functions include overcurrent, overvoltage, undervoltage, overtemperature, and ground fault detection. The unit is designed for panel or enclosure mounting and operates within an ambient temperature range of 0 to 50 degrees Celsius, with a protection rating suitable for open-type installation.
The PowerFlex 700 drive is commonly used in industries such as material handling, packaging, food and beverage, water and wastewater treatment, and general manufacturing. It is well suited for driving conveyors, pumps, fans, compressors, and mixers where variable speed operation improves process efficiency and reduces energy consumption. The drive's compatibility with Rockwell Automation control systems and its broad communication option support make it a practical choice for facilities already operating within an Allen-Bradley or Rockwell ecosystem.
Technical Specifications
| Series / Product Family | PowerFlex 700 |
|---|---|
| Input Voltage | 400 – 480V AC, 3-phase |
| Input Frequency | 47 – 63 Hz |
| Output Current (Continuous) | 8.0 A |
| Power Rating | 4.0 kW (5 HP) at 480V |
| Control Type | V/Hz and Sensorless Vector Control |
| Feedback Interface | Optional encoder feedback via auxiliary card |
| Communication Interface | Optional adapter cards: EtherNet/IP, DeviceNet, ControlNet, Profibus DP |
| Operating Temperature | 0 to 50 degrees C (derating required above 40 degrees C) |
| Storage Temperature | -40 to 70 degrees C |
| Relative Humidity | 5 to 95% non-condensing |
| IP / Protection Rating | IP20 / Open Type |
| Mounting | Panel / Enclosure Mount |
| Certifications | UL, cUL, CE, C-Tick |
| Braking | Dynamic braking transistor included |
| Output Frequency Range | 0 – 400 Hz |
Common Fault Codes
- Fault Code 2
- Auxiliary Input fault. The auxiliary input interlock has been opened or a signal has been lost on the auxiliary input terminal.
Check wiring to the auxiliary input terminals. Verify that any external interlock devices or safety relays connected to the auxiliary input are functioning and closed. Clear the fault and restart. - Fault Code 3
- Power Loss fault. DC bus voltage dropped below the minimum threshold, indicating a loss or significant sag of input AC power.
Check incoming AC supply voltage for sags, dropouts, or phase loss. Verify input fuses and connections. Restore stable input power and clear the fault. - Fault Code 4
- Undervoltage fault. DC bus voltage has fallen below the undervoltage trip level during operation.
Measure input line voltage and verify it is within the specified range of 400-480V AC. Check for loose connections, blown fuses, or a failing input power supply. Clear the fault after restoring proper voltage. - Fault Code 5
- Overvoltage fault. DC bus voltage has exceeded the maximum allowable level, typically caused by regenerative energy from a decelerating load.
Increase the deceleration time parameter to reduce regenerative energy. Verify that the dynamic braking resistor (if installed) is correctly connected and functioning. Check input line voltage for overvoltage conditions. - Fault Code 7
- Motor Overload fault. The drive's electronic overload protection has detected that the motor has been operating above its rated current for an extended period.
Check the motor load for mechanical binding or excessive load. Verify that motor nameplate data and overload parameters are correctly programmed in the drive. Allow the motor to cool before restarting. - Fault Code 12
- HW Overcurrent fault. Output current has exceeded the hardware overcurrent trip level, indicating a severe overcurrent condition.
Check motor wiring for short circuits or ground faults. Verify that the motor is not mechanically jammed. Inspect output power devices. If the fault persists after clearing wiring issues, the drive power section may require inspection or replacement. - Fault Code 25
- Drive Overtemperature fault. The drive heatsink temperature has exceeded the maximum allowable limit.
Check that cooling fans are operating correctly. Verify that ambient temperature is within specification (0-50 degrees C). Clean heatsink fins of dust and debris. Ensure adequate airflow clearance around the drive enclosure. - Fault Code 33
- Auto Restart Tries fault. The drive has attempted to automatically restart the maximum number of times following a fault without successfully running.
Identify and resolve the underlying fault that is causing repeated trips. Review the fault queue log in the drive parameters. Correct the root cause before manually clearing this fault and restarting.
Frequently Asked Questions
What is the output current rating of the 20BD8P0A0AYNANC0?
The 20BD8P0A0AYNANC0 has a continuous output current rating of 8.0A, corresponding to approximately 4.0 kW (5 HP) at 480V AC.
What communication protocols does the PowerFlex 700 20BD8P0A0AYNANC0 support?
The drive does not include a built-in fieldbus port but supports optional plug-in communication adapter cards for EtherNet/IP, DeviceNet, ControlNet, and Profibus DP networks. The specific option card must be ordered and installed separately.
Does this drive support encoder feedback for closed-loop vector control?
The base unit supports sensorless vector control without an encoder. Closed-loop vector control with encoder feedback is available by installing an optional encoder feedback card into the drive's option slot.
What input voltage range is this drive designed for?
The 20BD8P0A0AYNANC0 is designed for a 400-480V AC, three-phase input supply operating at 47-63 Hz. It is not suitable for single-phase input power.
Can the 20BD8P0A0AYNANC0 be used as a direct replacement in an existing PowerFlex 700 installation?
Yes, provided the replacement unit matches the voltage class, current rating, and frame size of the original drive. Parameters from the original drive should be backed up using a HIM or DriveExplorer software and restored to the replacement unit to ensure consistent operation.
Troubleshooting
Drive powers up but immediately trips on Fault Code 12 (HW Overcurrent) at startup
Disconnect the motor leads from the drive output terminals (T1, T2, T3) and attempt to run the drive unloaded. If the fault clears, the issue is in the motor or output wiring. If the fault persists with no motor connected, the drive output power section may be damaged.
Inspect motor wiring for phase-to-phase or phase-to-ground short circuits using a megohmmeter. Replace damaged wiring or motor as needed. If the drive output IGBTs are shorted, the drive power board will require professional repair or replacement.
Drive displays Fault Code 25 (Overtemperature) during normal operation
Check the heatsink temperature using an infrared thermometer and compare against ambient temperature. Inspect the internal cooling fan for operation by listening for fan noise and checking airflow at the drive vents.
Clean heatsink fins and internal airways of accumulated dust. Replace the internal cooling fan if it is not spinning or is running slowly. Ensure minimum clearance distances above and below the drive are maintained per installation guidelines. If ambient temperature exceeds 40 degrees C, apply the required current derating.
Motor runs but speed does not match the commanded reference
Verify the speed reference source parameter setting in the drive. Check the analog input signal level at the relevant terminal if using an analog reference. Compare the commanded frequency displayed on the HIM against the actual output frequency.
Confirm that the speed reference source parameter (e.g., Speed Reference A) is set to the correct input source. Calibrate the analog input scaling parameters if using a 0-10V or 4-20mA reference signal. Check for signal noise or wiring issues on the analog input cable.
Drive does not respond to start command
Check the drive's control mode parameter to determine whether it is set for two-wire or three-wire control, and verify that the correct start/stop terminals are being used. Measure voltage at the control input terminals to confirm the start signal is present.
Verify control wiring matches the configured control mode. Confirm that the Stop input (typically terminal 01) is held high and that the Start input is being pulsed or held as required. Check for any active faults in the fault queue that may be preventing a start command from being accepted.
Optional communication adapter card is not recognized by the drive or the control network
Power down the drive and reseat the communication adapter card in its option slot. Verify that the card is fully engaged and that no connector pins are bent. Check the drive parameter for the installed option card type to confirm detection.
Ensure the communication adapter card is compatible with the PowerFlex 700 platform. Update drive firmware if the card requires a minimum firmware version. Verify network wiring, termination resistors, and node address settings on the adapter card. Replace the adapter card if it remains undetected after reseating.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|
Common defects
Common defects on a Allen-Bradley 20BD8P0A0AYNANC0 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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