Allen-Bradley 20BD034A0AYNANC0
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The Allen-Bradley 20BD034A0AYNANC0 is a PowerFlex 700 series AC variable frequency drive manufactured by Allen-Bradley, a brand of Rockwell Automation. This unit belongs to the PowerFlex 700 product family, designed for general-purpose variable speed motor control applications. The PowerFlex 700 series provides robust, flexible drive solutions for a wide range of industrial motor control requirements.
The 20BD034A0AYNANC0 is rated for 400-480V AC three-phase input and delivers a continuous output current of 34 amps, corresponding to approximately 18.5 kW (25 HP) at 480V. The drive supports multiple control modes including sensorless vector, closed-loop vector with encoder feedback, and volts-per-hertz control. It features an embedded EtherNet/IP communication interface option depending on the configured communication module, and supports additional network options via the peripheral expansion slot. The unit includes a built-in brake transistor, comprehensive fault diagnostics, and a removable Human Interface Module (HIM) for local parameter configuration and monitoring.
The PowerFlex 700 drive is widely deployed in industries such as material handling, packaging, pumping, HVAC, compressors, and general manufacturing. It is suitable for applications requiring precise speed and torque control of standard induction motors, including conveyor systems, fans, pumps, and mixers. The drive's flexible control architecture and broad communication options make it compatible with a variety of automation architectures, including Rockwell Automation's Integrated Architecture platform.
Technical Specifications
| Series/Product Family | PowerFlex 700 |
|---|---|
| Input Voltage | 400 – 480V AC, 3-phase |
| Input Frequency | 47 – 63 Hz |
| Output Current (Continuous) | 34 A |
| Power Rating | 18.5 kW (25 HP) at 480V AC |
| Output Frequency Range | 0 – 400 Hz |
| Control Type | Sensorless Vector, Closed-Loop Vector, Volts/Hz |
| Feedback Interface | Incremental encoder (via optional feedback module) |
| Communication Interface | Peripheral expansion slot for optional communication modules (EtherNet/IP, DeviceNet, ControlNet, Profibus) |
| 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 | IP20 / NEMA Type 1 (open type) |
| Mounting | Panel mount |
| Certifications | UL, cUL, CE, C-Tick |
| Safety Features | Safe Torque Off (STO) capable via optional safety module |
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 terminal. Clear the fault once the external condition is resolved. - Fault Code 3
- Power Loss fault. DC bus voltage dropped below the minimum threshold, indicating an input power interruption or severe voltage sag.
Check incoming AC supply voltage for sags or interruptions. Verify input fuses and connections. Investigate upstream power quality issues. - Fault Code 4
- Undervoltage fault. DC bus voltage has fallen below the undervoltage trip level during operation.
Verify that the input AC voltage is within the rated range (400-480V AC). Check for loose input connections or undersized supply wiring. - Fault Code 5
- Overvoltage fault. DC bus voltage has exceeded the overvoltage trip level, typically caused by regenerative energy from the motor during deceleration.
Increase the deceleration ramp time, or install a dynamic braking resistor. Verify that the input supply voltage is not above the rated maximum. - Fault Code 7
- Motor Overload fault. The drive's electronic overload function has detected that the motor has been operating above its rated current for an extended period.
Check the motor load for mechanical binding or overloading. Verify that the motor nameplate current is correctly programmed into the drive parameters. 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 for a short circuit in the motor wiring or at the motor terminals. Verify motor insulation resistance. Inspect the drive output transistors for damage. - Fault Code 25
- Drive Overtemperature fault. The drive heatsink temperature has exceeded the maximum allowable limit.
Check that the ambient temperature is within specification. Verify that cooling fans are operating correctly and that ventilation clearances are maintained. Clean any dust from heatsink fins. - Fault Code 33
- Auto Restart Tries fault. The drive has attempted to automatically restart the maximum number of times following a fault without successfully clearing the fault condition.
Identify and resolve the underlying fault that triggered the repeated restarts. Review the fault queue in the drive parameters to determine the root cause fault code.
Frequently Asked Questions
What is the output current and power rating of the 20BD034A0AYNANC0?
The 20BD034A0AYNANC0 provides a continuous output current of 34 amps, corresponding to approximately 18.5 kW (25 HP) when used with a 480V AC three-phase supply.
What communication protocols are supported by this drive?
The PowerFlex 700 supports optional communication modules installed in the peripheral expansion slot, including EtherNet/IP, DeviceNet, ControlNet, and Profibus DP. The specific communication option is determined by the installed peripheral module.
Can the 20BD034A0AYNANC0 be used with an encoder for closed-loop speed control?
Yes, the PowerFlex 700 supports closed-loop vector control with an incremental encoder when the appropriate feedback module is installed. This enables precise speed and torque regulation.
What control modes does the PowerFlex 700 support?
The drive supports Volts/Hz, Sensorless Vector Control (SVC), and Closed-Loop Vector Control modes. The appropriate mode is selected via drive parameters based on the application requirements.
Is a dynamic braking resistor required for this drive?
The PowerFlex 700 includes an internal brake transistor, so an external dynamic braking resistor can be connected directly to the drive's brake resistor terminals if the application involves frequent or heavy regenerative braking loads.
Troubleshooting
Drive trips on Overvoltage fault (Fault Code 5) during deceleration
Monitor the DC bus voltage during deceleration using the drive's diagnostic parameters. If the bus voltage exceeds the overvoltage threshold, regenerative energy from the motor is not being dissipated.
Increase the deceleration ramp time in the drive parameters. If fast deceleration is required, connect an appropriately sized dynamic braking resistor to the brake transistor terminals.
Drive displays a Drive Overtemperature fault (Fault Code 25) repeatedly
Check the heatsink temperature using the drive's diagnostic parameters. Inspect the cooling fan operation and verify that the ambient temperature and ventilation clearances meet the installation requirements.
Clean dust and debris from the heatsink fins and cooling fan. Ensure minimum clearances around the drive are maintained. If ambient temperature exceeds 40 degrees C, apply the appropriate derating. Replace the cooling fan if it is not operating correctly.
Motor runs but speed is unstable or oscillates
Check the control mode setting and verify that the motor nameplate data (voltage, current, frequency, RPM) is correctly entered in the drive parameters. If using Sensorless Vector Control, verify that motor autotune has been performed.
Perform a static or rotational autotune procedure to allow the drive to characterize the motor. Verify that the speed reference signal is stable and free from electrical noise. Check encoder wiring and shielding if closed-loop mode is in use.
Drive does not respond to start command
Check the drive's control source and reference source parameters to confirm the expected start command source (terminal block, HIM, or network). Verify that the enable input and any auxiliary input signals are in the correct state.
Confirm that the control wiring to the digital input terminals is correct and that the input voltage levels are within specification. Verify that no active faults are present in the fault queue and clear any latched faults before attempting to restart.
HW Overcurrent fault (Fault Code 12) occurs at startup or under load
Measure the insulation resistance of the motor and motor cable using a megohmmeter to check for insulation breakdown. Inspect the output power wiring for short circuits or incorrect connections.
Replace damaged motor cables or repair motor insulation faults. If wiring is intact, reduce the acceleration ramp time or lower the current limit parameter. If the fault persists with no load connected, the drive output transistors may be damaged and the unit should be sent for repair.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|
Common defects
Common defects on a Allen-Bradley 20BD034A0AYNANC0 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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