Allen Bradley 20BC170A3ANNACC0 PowerFlex 700 AC Drive

Industrial Applications

The Allen-Bradley 20BC170A3ANNACC0 PowerFlex 700 AC Drive is a large-format industrial variable frequency drive designed for demanding motor-control applications. As part of the PowerFlex 700 family, it is suited to automated equipment where controlled motor speed, smooth acceleration, dependable operation, and flexible control are important to overall system performance.

Typical applications include heavy-duty conveyors, pumps, fans, compressors, mixers, material-handling systems, machine tools, extruders, and process equipment. These applications often benefit from the ability to adjust motor speed to match production requirements instead of operating continuously at a fixed speed.

For conveyor systems, controlled acceleration and deceleration can help reduce mechanical stress on belts, gearboxes, couplings, and driven machinery. In process applications, adjustable motor speed can also provide operators and control systems with greater flexibility when production conditions change.

The 20BC170A3ANNACC0 has a substantial physical footprint of 976.3 × 403.9 × 275.5 mm and weighs 71.44 kg (157.50 lb). Its large industrial format makes careful planning of panel space, mounting support, ventilation, electrical clearances, and maintenance access essential.

For OEMs, system integrators, and industrial maintenance teams, this PowerFlex 700 drive provides a robust platform for integrating AC motor control into larger automation systems.

Designed for Demanding Motor-Control Environments

The PowerFlex 700 platform is built for applications where motor control needs to be adaptable rather than limited to simple start-and-stop operation. By regulating the electrical conditions applied to the motor, the drive can provide controlled acceleration, deceleration, and variable-speed operation.

One important benefit is smooth motor starting. A large motor connected directly to the supply can produce a substantial starting current and mechanical shock. With an appropriately configured AC drive, the motor can be brought up to operating speed through a controlled acceleration profile.

The same flexibility applies during stopping. High-inertia loads can generate significant regenerative energy during deceleration, so the drive configuration needs to be matched to the mechanical characteristics of the application.

The PowerFlex 700 family also provides configurable monitoring and protective functions. These capabilities can assist maintenance personnel when investigating abnormal conditions such as motor overload, overcurrent, DC-bus problems, or control-related faults.

Another practical advantage is integration with industrial control systems. In an automated production line, the drive can operate as one part of a coordinated architecture involving PLCs, operator interfaces, sensors, safety circuits, and other motion-control equipment.

For applications where motor speed must be adjusted according to production requirements, the 20BC170A3ANNACC0 offers a substantial industrial drive platform with the flexibility expected from the PowerFlex 700 family.

Technical FAQs

1. What is the Allen-Bradley 20BC170A3ANNACC0?

It is a PowerFlex 700 AC drive designed for variable-speed control of compatible industrial AC motors.

2. What is the main purpose of an adjustable frequency drive?

An adjustable frequency drive regulates motor operation by controlling the electrical output supplied to the motor. This allows controlled speed, acceleration, and deceleration according to the application's requirements.

3. Why is controlled acceleration useful for large mechanical loads?

Controlled acceleration can reduce the sudden mechanical forces associated with starting a large load. This can help limit stress on couplings, gearboxes, belts, shafts, and other drivetrain components.

4. What information should be verified before configuring the drive for a motor?

The motor's nameplate information and application requirements should be reviewed, including voltage, current, frequency, rated speed, and other parameters required by the selected motor-control mode.

5. What can cause an AC drive to trip on overcurrent?

Common possibilities include excessive load, overly aggressive acceleration, incorrect motor parameters, motor or cable faults, mechanical obstruction, or an unsuitable motor-control configuration. The exact fault condition should be investigated before repeatedly resetting the drive.

6. Why can deceleration produce a DC-bus overvoltage condition?

When a high-inertia motor decelerates, mechanical energy can be returned to the drive as electrical energy. If the regenerated energy raises the DC-bus voltage beyond the permitted level, the drive may trip.

7. What should be checked when a drive repeatedly faults during acceleration?

Review the exact fault code and determine whether the fault is consistently associated with acceleration. Then examine acceleration time, motor parameters, mechanical loading, motor wiring, and the condition of the driven equipment.

8. What can cause a motor to run at an incorrect speed?

Possible causes include an incorrect speed reference, incorrect frequency or speed parameters, unsuitable control-source settings, motor data errors, or a problem with the control signal. The commanded reference and actual drive output should be compared during troubleshooting.

9. What should be considered when installing a large PowerFlex 700 drive?

The mounting structure must safely support the drive, while the installation should provide appropriate ventilation, electrical clearance, grounding, cable routing, and access for inspection and maintenance.

10. What should be done before replacing an existing PowerFlex 700 drive?

The complete catalog number should be compared with the replacement candidate. Input/output ratings, control configuration, installed options, motor requirements, enclosure arrangement, and communication functions should all be verified before installation.