Allen Bradley 20BC260A3ANNANC0 PowerFlex 700 AC Drive

Applications

The Allen Bradley 20BC260A3ANNANC0 PowerFlex 700 AC Drive is a high-power variable frequency drive designed for three-phase industrial motor control. With a 260 A continuous output rating and 132 kW normal-duty capacity, it is suitable for large motor-driven equipment where controlled acceleration, deceleration, speed regulation, and reliable torque management are required.

Typical applications include:

• Heavy-duty conveyor systems
• Large pumps and water-treatment equipment
• Industrial fans and blowers
• Compressors
• Extrusion machinery
• Material-handling systems
• Paper and converting machinery
• Metals and process equipment
• Mixers and agitators
• Production lines and machine automation
• Large industrial ventilation systems
• General-purpose three-phase motor control

The PowerFlex 700 platform supports V/Hz control, sensorless vector control, and vector control with FORCE technology. This gives engineers flexibility when selecting the appropriate control method for the motor and mechanical load.

For existing Allen Bradley automation systems, the 20BC260A3ANNANC0 can also be used as a replacement or maintenance drive where the complete catalog configuration, electrical rating, enclosure requirements, and installed options match the original equipment.

Advantages

High-current output

The drive provides 260 A continuous output current and supports 132 kW normal-duty and 110 kW heavy-duty operation, making it suitable for large industrial motors.

Flexible motor-control methods

The PowerFlex 700 architecture supports V/Hz, sensorless vector, and vector control. This allows the drive to be configured for applications ranging from straightforward speed regulation to more demanding torque-control requirements.

24 V I/O control

The 20BC260A3ANNANC0 uses 24 V control I/O, providing compatibility with common industrial control architectures and allowing external PLC signals to be integrated into drive start, stop, reference, and status functions.

Integrated EMC filtering

This configuration includes an EMC filter with a common-mode choke, helping manage conducted electrical noise when the drive is correctly installed and grounded.

Multiple communication possibilities

The PowerFlex 700 platform supports industrial communication options including DeviceNet, ControlNet, EtherNet/IP, and other network architectures through the appropriate communication configuration. The exact communication option should be confirmed when replacing a drive because catalog-number variants differ.

Strong overload performance

The 260 A frame rating provides 308 A for one-minute heavy-duty overload and up to 410 A for three seconds under the specified conditions. This is useful for equipment experiencing temporary load peaks.

Programmable acceleration and deceleration

Two independently programmable acceleration and deceleration times can be configured from 0 to 3600 seconds in 0.1-second increments, allowing the drive to be adapted to different mechanical inertia and process requirements.

Industrial protection functions

The PowerFlex 700 includes protection and monitoring functions for conditions such as output phase-to-phase faults, phase-to-ground faults, heat-sink overtemperature, DC-bus abnormalities, and motor overload.

Suitable for retrofit applications

Because the PowerFlex 700 family has been widely used in industrial installations, the 20BC260A3ANNANC0 can be particularly useful for maintaining existing machinery where a complete migration to a newer drive platform is not immediately practical.

Technical FAQs

1. What is the output current of the Allen Bradley 20BC260A3ANNANC0?
The continuous output current is 260 A for three-phase operation. The published ratings are 132 kW for normal duty and 110 kW for heavy duty.

2. What is the nominal input voltage?
The drive is designed around a 400 V AC nominal supply and belongs to the 380–480 V class. The actual installation voltage should remain within the specified operating range.

3. What motor-control modes are available?
The PowerFlex 700 supports standard V/Hz control, sensorless vector control, and vector control. The appropriate mode depends on the motor data, required speed regulation, torque characteristics, and application.

4. Does the 20BC260A3ANNANC0 require an encoder?
No feedback option is specified for this configuration. The PowerFlex 700 can operate without encoder feedback when an appropriate open-loop or sensorless control strategy is selected. Closed-loop applications may require a suitable feedback interface.

5. Does this drive include an internal braking resistor?
No internal braking resistor is provided. The specific configuration should also be checked for brake IGBT availability before designing a dynamic-braking system.

6. How should the drive be configured after replacement?
Before commissioning, verify the motor nameplate voltage, rated current, frequency, base speed, power, and other motor parameters. Confirm the command source, speed reference, acceleration/deceleration times, stop mode, I/O assignments, and communication settings. For sensorless vector operation, the required motor tuning procedure should also be completed.

7. What can cause an overcurrent fault during acceleration?
Common causes include excessive load torque, acceleration time that is too short, incorrect motor parameters, mechanical binding, motor cable problems, or an unsuitable control configuration. Increasing acceleration time and checking the motor/load condition are useful first diagnostic steps.

8. What should be checked when the motor does not reach the commanded speed?
Check the active speed reference, maximum-frequency setting, current limit, motor nameplate parameters, load torque, slip compensation, and control mode. If the drive is controlled through a PLC or communication network, also verify that the commanded reference is actually reaching the drive.

9. What is the maximum output frequency?
The PowerFlex 700 platform provides up to 400 Hz in standard control and up to 420 Hz in vector-control configurations, depending on the configuration. The motor manufacturer's mechanical and electrical limits must always be observed.

10. What environmental conditions are important for this drive?
The IP20/NEMA/UL Type 1 configuration is intended for installation inside an appropriate enclosure. For Frame 6 ratings, the typical surrounding-air operating range is 0–50 °C. Relative humidity should remain within 5–95% noncondensing, and the drive should be protected from corrosive gases, conductive contamination, and excessive dust.