Allen-Bradley 20AD027C3AYNANC0
Allen-Bradley repareren bij Cirele is:
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• Betaling pas na geslaagde reparatie
• Proactieve vervanging van tijdgevoelige onderdelen
• Gedetailleerd test- en reparatierapport wordt verstrekt
• 2 jaar garantie op alle reparaties
• Langdurige ondersteuning tot einde levensduur.
The Allen-Bradley 20AD027C3AYNANC0 is a PowerFlex 70 series AC variable frequency drive manufactured by Allen-Bradley, a brand of Rockwell Automation. This unit is designed to provide precise speed and torque control of AC induction motors in a wide range of industrial applications. The PowerFlex 70 series is a mid-range drive platform offering a balance of performance, flexibility, and ease of integration into automated systems.
The 20AD027C3AYNANC0 is rated for 400-480V AC three-phase input and delivers a continuous output current of 27 A, corresponding to a motor power rating of approximately 15 kW (20 HP) at 480V. The drive supports multiple control modes including sensorless vector control and volts-per-hertz (V/Hz) control, enabling flexible motor management without the need for encoder feedback in many applications. It features an embedded RS-485 DSI (Drive Serial Interface) communication port and is compatible with optional communication adapter modules for DeviceNet, EtherNet/IP, ControlNet, and Profibus DP. The drive includes built-in protective functions such as overcurrent, overvoltage, undervoltage, overtemperature, and ground fault protection. A removable Human Interface Module (HIM) can be attached for local parameter programming and diagnostics.
The PowerFlex 70 drive is widely deployed in manufacturing, material handling, pump and fan control, compressor systems, and HVAC applications. Its compact footprint and flexible mounting options make it suitable for integration into machine-level control panels as well as standalone enclosures. Industries such as automotive, food and beverage, water and wastewater treatment, and general industrial manufacturing commonly use this drive for its reliable motor control performance and compatibility with Allen-Bradley control architectures including ControlLogix and CompactLogix PLCs.
Technical Specifications
| Series / Product Family | PowerFlex 70 |
|---|---|
| Input Voltage | 400 – 480V AC, Three-Phase |
| Output Current (Continuous) | 27 A |
| Power Rating | 15 kW (20 HP) at 480V AC |
| Input Frequency | 47 – 63 Hz |
| Output Frequency Range | 0 – 500 Hz |
| Control Type | Sensorless Vector Control, V/Hz Control |
| Communication Interface | RS-485 DSI (embedded); optional DeviceNet, EtherNet/IP, ControlNet, Profibus DP adapters |
| Feedback Interface | Optional encoder feedback via auxiliary encoder module |
| 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 (open type enclosure) |
| Mounting | Panel mount, DIN rail (with adapter) |
| Certifications | UL, cUL, CE, C-Tick |
| Safety Features | Overcurrent, Overvoltage, Undervoltage, Overtemperature, Ground Fault, Short Circuit protection |
Common Fault Codes
- Fault Code 2
- Auxiliary Input fault. The auxiliary input interlock has been opened, interrupting drive operation.
Check the auxiliary input wiring and interlock device. Ensure the interlock circuit is closed before attempting to restart the drive. - Fault Code 3
- Power Loss fault. Input power to the drive was lost or dropped below acceptable levels during operation.
Verify input power supply voltage is within the 400-480V AC specification. Check input fuses, contactors, and supply wiring for faults. - Fault Code 4
- Undervoltage fault. DC bus voltage dropped below the minimum threshold during operation.
Check input supply voltage for sags or interruptions. Inspect input fuses and connections. Verify supply capacity is adequate for the load. - Fault Code 5
- Overvoltage fault. DC bus voltage exceeded the maximum allowable level, typically caused by regenerative energy from the motor.
Check for excessive deceleration rates and increase the decel time. Consider adding a dynamic braking resistor if regenerative loads are present. - Fault Code 7
- Motor Overload fault. The drive has detected that the motor has been operating above its rated current for an extended period.
Check motor load for mechanical binding or overloading. Verify motor nameplate current matches drive parameter settings. Allow motor to cool before restarting. - Fault Code 12
- HW Overcurrent fault. Output current exceeded the hardware overcurrent trip level, indicating a severe overcurrent condition.
Check motor and output wiring for short circuits or ground faults. Verify motor insulation resistance. Inspect drive output transistors for damage. - Fault Code 25
- Drive Overtemperature fault. The drive heatsink temperature has exceeded the allowable limit.
Check that ambient temperature is within specification. Clean heatsink fins and cooling fan. Verify adequate airflow clearances around the drive enclosure. - Fault Code 33
- Auto Restart Tries fault. The drive has exceeded the configured number of automatic restart attempts without successfully resuming operation.
Identify and resolve the underlying fault that triggered the restart attempts. Reset the fault manually and investigate the root cause before re-enabling auto restart.
Frequently Asked Questions
What is the output current rating of the 20AD027C3AYNANC0?
The 20AD027C3AYNANC0 has a continuous output current rating of 27 A, suitable for driving motors up to approximately 15 kW (20 HP) at 480V AC.
What communication protocols does the PowerFlex 70 20AD027C3AYNANC0 support?
The drive includes an embedded RS-485 DSI port as standard. Optional plug-in communication adapter modules allow connectivity via DeviceNet, EtherNet/IP, ControlNet, or Profibus DP networks.
Can the 20AD027C3AYNANC0 be used with encoder feedback for closed-loop control?
Yes, the PowerFlex 70 supports closed-loop vector control when an optional encoder feedback module is installed. Without the encoder module, the drive operates in open-loop sensorless vector or V/Hz mode.
What input voltage range does the 20AD027C3AYNANC0 accept?
This drive is designed for three-phase input voltage in the range of 400 to 480V AC at 47 to 63 Hz, corresponding to the PowerFlex 70 400V class (Code A in the catalog number).
Is the 20AD027C3AYNANC0 compatible with Rockwell Automation PLCs such as ControlLogix?
Yes, with the appropriate communication adapter module installed (such as an EtherNet/IP or ControlNet adapter), the drive integrates directly with ControlLogix, CompactLogix, and other Allen-Bradley PLC platforms using standard Rockwell Automation programming tools.
Troubleshooting
Drive displays Fault Code 5 (Overvoltage) repeatedly during deceleration
Monitor the DC bus voltage during deceleration using the drive's parameter monitoring function. If bus voltage rises above the overvoltage threshold, regenerative energy from the motor is the likely cause.
Increase the deceleration time in the drive parameters to reduce regenerative energy. If fast deceleration is required, install a dynamic braking resistor and enable the braking chopper function in the drive configuration.
Drive powers up but motor does not rotate when a run command is issued
Check that the run command source is correctly configured (terminal block, HIM, or network). Verify that the speed reference is non-zero and that no active faults or inhibits are present. Inspect control wiring at the drive terminal block.
Confirm parameter settings for command source and speed reference match the wiring configuration. Clear any active faults. Check enable and run input wiring for continuity and correct signal levels.
Drive overheating and tripping on Fault Code 25 (Drive Overtemperature)
Inspect the drive heatsink and cooling fan for dust accumulation or blockage. Measure ambient temperature inside the enclosure. Verify that minimum airflow clearances above and below the drive are maintained.
Clean the heatsink fins and cooling fan blades. Ensure the enclosure ventilation is adequate and ambient temperature does not exceed 50 degrees C. If necessary, derate the drive output current or add forced ventilation to the enclosure.
Communication loss between the drive and PLC when using an optional network adapter
Check the network adapter seating in the drive option slot. Verify network cable connections and termination resistors on the network. Confirm drive node address and baud rate parameters match the network configuration.
Reseat the communication adapter module firmly in the drive option slot. Inspect and replace damaged network cables. Reconfigure node address and communication parameters as required. Check for duplicate node addresses on the network.
Drive trips on Fault Code 12 (HW Overcurrent) immediately upon starting
Disconnect the motor from the drive output and perform an insulation resistance test on the motor windings and output cables. Check for short circuits between output phases or between phases and ground.
If a wiring fault is found, repair or replace the affected cables. If motor insulation has failed, the motor requires rewinding or replacement. If wiring and motor test satisfactory, the drive output power stage may be damaged and the drive should be sent for repair.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|
Common defects
Common defects on a Allen-Bradley 20AD027C3AYNANC0 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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