Allen-Bradley 20BC085A0ANNANC0
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The Allen-Bradley 20BC085A0ANNANC0 is a PowerFlex 700S series AC variable frequency drive manufactured by Allen-Bradley, a brand of Rockwell Automation. This drive belongs to the Phase II control platform of the PowerFlex 700S family, designed for high-performance vector control applications requiring precise speed and torque regulation. The 20BC085A0ANNANC0 is rated for 85 amps continuous output current and is intended for use with 400/480V AC three-phase power systems.
The PowerFlex 700S drive features Direct Field Oriented Control (DFOC) for high dynamic performance, supporting both open-loop and closed-loop feedback configurations including incremental encoders and resolvers. It includes an embedded EtherNet/IP communication interface option capability and is compatible with various communication adapter modules for DeviceNet, ControlNet, and Profibus DP integration. The drive incorporates advanced safety functionality compatible with Safe Torque Off (STO) to meet SIL 2 and PLe safety requirements, and offers a wide operating temperature range suitable for industrial cabinet installations. Onboard non-volatile memory retains parameter settings through power cycles, and the drive supports DriveLogix embedded controller options for standalone programmable control.
The PowerFlex 700S is widely deployed in industries such as oil and gas, metals and mining, pulp and paper, and material handling, where precise torque control and high dynamic response are critical. It is commonly used to drive pumps, compressors, extruders, winders, and large conveyor systems that demand accurate speed regulation under varying load conditions. The drive's robust design and compatibility with Rockwell Automation's Integrated Architecture make it well suited for integration into larger PLC-based control systems using Studio 5000 and RSLogix 5000 programming environments.
Technical Specifications
| Series / Product Family | PowerFlex 700S |
|---|---|
| Output Current (Continuous) | 85 A |
| Input Voltage | 400 / 480 V AC, 3-phase |
| Input Frequency | 50 / 60 Hz |
| Power Rating | Approximately 45 kW / 60 HP at 480 V |
| Control Type | Direct Field Oriented Control (DFOC), Sensorless Vector, Closed-Loop Vector |
| Feedback Interface | Incremental Encoder, Resolver (via feedback module) |
| Communication Interface | EtherNet/IP, DeviceNet, ControlNet, Profibus DP (via adapter modules) |
| Safety Features | Safe Torque Off (STO), SIL 2 / PLe capable |
| Operating Temperature | 0 to 50 degrees C (with derating above 40 degrees C) |
| Storage Temperature | -40 to 70 degrees C |
| Relative Humidity | 5 to 95% non-condensing |
| IP / Protection Rating | IP20 (open type enclosure) |
| Mounting | Panel / Cabinet Mount |
| Certifications | UL, CE, cUL |
| Output Frequency Range | 0 to 400 Hz |
Common Fault Codes
- Fault Code 2
- Auxiliary Input fault. An external fault signal has been received via the auxiliary input terminal.
Check the wiring and status of the device connected to the auxiliary input. Clear the fault condition at the source and reset the drive. - Fault Code 3
- Power Loss fault. DC bus voltage dropped below the minimum threshold, indicating an input power interruption.
Check input supply voltage for sags or interruptions. Verify all three input phases are present and within specification. Check input fuses and contactors. - Fault Code 4
- Undervoltage fault. DC bus voltage has fallen below the undervoltage trip level during operation.
Verify input line voltage is within the rated range. Check for loose connections on the input terminals. Inspect input fuses and line reactor if installed. - Fault Code 5
- Overvoltage fault. DC bus voltage has exceeded the overvoltage trip threshold, often caused by regenerative energy from the load.
Check for excessive deceleration rates and increase deceleration time. Verify input line voltage is not too high. Consider adding a dynamic braking resistor or active front end. - Fault Code 7
- Motor Overload fault. The drive's electronic overload function has detected sustained overcurrent indicating motor thermal overload.
Check motor load for mechanical binding or excessive load. Verify motor overload parameters are set correctly for the motor nameplate data. Allow motor to cool before restarting. - Fault Code 12
- HW Overcurrent fault. Output current has exceeded the hardware overcurrent trip level.
Check for a short circuit on the output wiring or within the motor windings. Verify motor insulation resistance. Inspect drive output power devices for damage. - Fault Code 13
- Ground Fault. Excessive current has been detected flowing to ground on the drive output.
Disconnect the motor and test insulation resistance of motor and output cables to ground. Repair or replace damaged cables or motor windings before restarting. - Fault Code 33
- Auto Restart Tries fault. The drive has exceeded the maximum number of automatic restart attempts following a fault.
Identify and resolve the underlying fault that triggered repeated restarts. Check the fault queue for the original fault code. Manually reset the drive after correcting the root cause.
Frequently Asked Questions
What is the continuous output current rating of the 20BC085A0ANNANC0?
The 20BC085A0ANNANC0 is rated for 85 A continuous output current, corresponding to approximately 45 kW / 60 HP at 480 V AC.
What communication protocols does the PowerFlex 700S 20BC085A0ANNANC0 support?
The drive supports multiple communication protocols through plug-in adapter modules, including EtherNet/IP, DeviceNet, ControlNet, and Profibus DP. The specific communication option installed depends on the adapter module fitted to the drive.
Does the 20BC085A0ANNANC0 support Safe Torque Off (STO) safety functionality?
Yes, the PowerFlex 700S platform supports Safe Torque Off (STO) functionality, which is capable of meeting SIL 2 and PLe safety integrity levels when properly configured and wired.
What feedback devices are compatible with this drive?
The PowerFlex 700S supports incremental encoders and resolvers for closed-loop vector control via compatible feedback option modules. Open-loop sensorless vector control is also available without a feedback device.
Is the 20BC085A0ANNANC0 compatible with Rockwell Automation Studio 5000 / RSLogix 5000?
Yes, the PowerFlex 700S integrates with Rockwell Automation's Studio 5000 and RSLogix 5000 programming environments through Add-On Profiles (AOPs), enabling seamless configuration and diagnostics within an Integrated Architecture system.
Troubleshooting
Drive displays an Overvoltage fault during deceleration
Monitor the DC bus voltage during deceleration using the drive's parameter display. If bus voltage rises above the overvoltage threshold, regenerative energy from the load is not being dissipated.
Increase the deceleration time in the drive parameters. If faster deceleration is required, install a dynamic braking resistor and enable the braking chopper function, or consider an active front end regenerative unit.
Drive trips on Ground Fault immediately after power-up or motor start
Disconnect the motor cables from the drive output terminals and measure insulation resistance of the motor windings and output cables to ground using a megohmmeter at 500 V DC or 1000 V DC.
If insulation resistance is below acceptable limits, replace damaged motor cables or repair/replace the motor. If insulation is acceptable, check the drive output current sensors and power module for internal faults.
Drive powers up but does not respond to speed reference commands
Verify the control source and reference source parameters are configured correctly. Check whether the drive is in Remote or Local control mode. Inspect analog input wiring and signal levels at the control terminals.
Correct the control source and speed reference source parameters to match the intended control method. Verify analog input signal is within the configured range (e.g., 0-10 V or 4-20 mA) and that the enable input is active.
Motor runs but exhibits unstable speed or torque oscillation in closed-loop mode
Check the encoder or resolver feedback signal for noise, loose connections, or incorrect wiring. Verify the feedback device resolution and type are correctly configured in the drive parameters.
Secure all feedback wiring and use shielded cables grounded at one end. Confirm feedback device parameters match the physical hardware. Retune the speed and current regulator gains using the drive's autotune function.
Drive runs hot and triggers thermal overload or overtemperature fault
Check the ambient temperature inside the enclosure and verify that the drive cooling fans are operating. Inspect heatsink fins for dust or debris blockage. Confirm the drive is not operating above its continuous current rating.
Clean the heatsink and ensure adequate airflow through the enclosure. Verify enclosure ventilation meets the drive's cooling requirements. If the load current consistently exceeds the drive rating, consider upsizing to the next current rating.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|
Common defects
Common defects on a Allen-Bradley 20BC085A0ANNANC0 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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