Allen Bradley 20BC170A0ANNANC0 PowerFlex 700 AC Drive

Industrial Applications

The Allen-Bradley 20BC170A0ANNANC0 PowerFlex 700 AC Drive is a high-performance adjustable frequency drive designed for industrial motor control applications where reliable speed regulation, flexible configuration, and integration with plant automation systems are important.

The PowerFlex 700 platform is suited to demanding applications such as conveyors, pumps, fans, compressors, material-handling equipment, machine tools, mixers, extruders, and process machinery. Its broad control capabilities allow engineers to adapt motor operation to different load profiles rather than relying on simple fixed-speed starting and stopping.

For automated production lines, an AC drive can provide controlled acceleration and deceleration, helping reduce mechanical shock during motor starts and stops. Variable-speed operation can also allow the motor to better match the process requirement, which is valuable in systems where operating speed changes throughout the production cycle.

The 20BC170A0ANNANC0 is a substantial industrial drive with a 71.44 kg mass and a large-format enclosure footprint. It is therefore more appropriate for fixed industrial installations than compact machine-mounted applications.

When incorporated into a properly engineered control architecture, the PowerFlex 700 can work alongside Allen-Bradley PLC and industrial automation equipment to provide coordinated motor control across a production system.

Control Capabilities That Matter in Production

The PowerFlex 700 family was developed for applications that require more than basic variable-frequency speed control. Its architecture supports configurable motor-control functions, allowing engineers to tailor drive behavior to the characteristics of the connected motor and mechanical load.

One of the most useful benefits of an adjustable frequency drive is controlled motor acceleration and deceleration. Instead of applying full operating speed immediately, the drive can gradually increase motor frequency and voltage according to configured parameters. This can help reduce mechanical stress on couplings, gearboxes, belts, and driven machinery.

Variable-speed operation also provides greater process flexibility. A conveyor, pump, or fan does not necessarily need to operate at one fixed speed throughout its entire operating cycle. By adjusting motor speed to process demand, the drive can provide more precise control of production equipment.

The PowerFlex 700 platform also supports configurable protection and monitoring functions. Drive parameters can be used to establish operating limits and identify conditions such as overcurrent, overvoltage, undervoltage, overload, and other abnormal operating states.

For maintenance personnel, diagnostic information can be particularly valuable. Instead of treating a motor problem and a drive problem as separate issues, technicians can use drive status and fault information as part of a broader troubleshooting process.

The 20BC170A0ANNANC0 is therefore a suitable choice for installations where a robust industrial AC drive is needed as part of a larger automated motor-control system.

Technical FAQs

1. What is the Allen-Bradley 20BC170A0ANNANC0?

It is an Allen-Bradley PowerFlex 700 adjustable frequency AC drive used to control the speed and operation of compatible three-phase AC motors in industrial automation systems.

2. What is the main function of a PowerFlex 700 AC drive?

The drive regulates motor operation by controlling electrical output to the connected AC motor. Depending on the application and configuration, it can control motor speed, acceleration, deceleration, and other operating characteristics.

3. Why use an AC drive instead of directly starting a motor?

An AC drive allows the motor to start and stop in a controlled manner and provides variable-speed operation. This can reduce mechanical shock and provide better process control than a simple across-the-line starter.

4. What should be verified before connecting a motor to the drive?

Verify the motor voltage, current, frequency, power rating, connection configuration, and operating requirements. The drive's programmed motor parameters should correspond to the actual motor being controlled.

5. What can cause an overcurrent fault?

Possible causes include excessive mechanical load, an acceleration time that is too short, motor wiring problems, a motor fault, incorrect motor parameters, or a mechanical obstruction. The fault history and drive parameters should be reviewed before repeatedly resetting the drive.

6. How should repeated drive trips be diagnosed?

Start by identifying the exact fault code and when it occurs. Determine whether the fault happens during acceleration, steady-state operation, deceleration, or startup. Then inspect the motor, cabling, mechanical load, and relevant drive parameters.

7. Why is proper acceleration time important?

An excessively short acceleration time can demand high current from the drive and motor. Increasing the acceleration time can reduce the instantaneous load on the electrical and mechanical system when the application permits it.

8. What can cause an overvoltage fault during deceleration?

Rapid deceleration can cause the motor to return energy to the DC bus. If the regenerated energy raises the DC-bus voltage beyond the allowable level, the drive may generate an overvoltage fault. Appropriate deceleration settings or a suitable braking arrangement may be required.

9. What is important when installing a large PowerFlex 700 drive?

The mounting structure must safely support the drive's weight, and adequate electrical clearances, ventilation, grounding, cable routing, and environmental conditions should be provided. The installation should also account for the substantial physical size of the unit.

10. What should be checked if the motor does not run after an enable command?

Check the drive status, control source, enable/interlock signals, active faults, programmed reference, motor connections, and relevant command parameters. An apparently healthy drive may intentionally prevent motor operation because an enable condition or configured interlock has not been satisfied.