Technical Specifications

FAQ

1. What are the rated current and power ratings of the Allen-Bradley 20BW142A0ANNANC0?
The Allen-Bradley 20BW142A0ANNANC0 PowerFlex 700 AC Drive provides a continuous output current rating of 142 A at a 932 V DC input. It is rated for 132 kW / 132 HP under normal-duty operation and 110 kW / 110 HP under heavy-duty operation. The drive can deliver 179 A for up to one minute and 238 A for up to three seconds under the specified overload conditions. Motor selection should be based primarily on the motor full-load current and actual load duty rather than horsepower alone, particularly when the application involves frequent acceleration, high starting torque, or variable loading.

2. What motor control methods are available on the 20BW142A0ANNANC0?
The drive uses vector control with 24 V DC I/O and supports selectable motor-control strategies including sensorless vector control and V/Hz control. Sensorless vector control can provide improved speed regulation and torque response without requiring a physical speed feedback device. For stable operation, the motor nameplate data should be entered accurately during commissioning. Parameters such as motor voltage, rated current, frequency, speed, and power should correspond to the actual motor. Proper tuning is particularly important when the drive is expected to provide consistent torque at low speed or during rapid load changes.

3. Does the 20BW142A0ANNANC0 include an internal braking resistor or brake IGBT?
No. This configuration does not include an internal brake IGBT or an internal drive-mounted braking resistor. This is important for applications involving high-inertia loads or frequent rapid deceleration because the motor can return regenerative energy to the DC bus during braking. If the regenerative energy cannot be controlled, the DC-bus voltage may rise and cause an overvoltage trip. The required braking solution should therefore be evaluated according to load inertia, deceleration time, stopping frequency, motor speed, and the overall duty cycle. An external braking arrangement may be required for demanding applications.

4. Can the 20BW142A0ANNANC0 be integrated with a PLC or DCS system?
Yes. The drive provides six digital inputs, three digital outputs, two analog inputs, and two analog outputs, allowing conventional hardwired control with PLC, DCS, or other automation equipment. This specific configuration does not include an internal communication module, so network-based control requires an appropriate communication option. PowerFlex 700 systems can be integrated into industrial architectures using communication technologies such as EtherNet/IP, DeviceNet, Modbus, PROFIBUS, CAN, and other supported interfaces. For a reliable control system, it is recommended to monitor drive status, output frequency, output current, fault information, and other operating parameters rather than using only a basic run command.

5. How should an overcurrent fault on the 20BW142A0ANNANC0 be diagnosed?
Start by checking the motor and driven machine for mechanical problems such as locked bearings, excessive friction, a jammed mechanism, or an unexpectedly high load. The motor cable should then be inspected for phase-to-phase shorts, ground faults, damaged insulation, and incorrect terminal connections. If the fault occurs primarily during acceleration, the acceleration time may be too short for the inertia of the machine. Increasing the acceleration time can reduce the instantaneous current demand. Motor nameplate parameters should also be verified, especially rated voltage, current, frequency, and speed. When using vector control, incorrect motor data or incomplete tuning can also produce unstable current behavior.

6. How can a DC-bus overvoltage condition be corrected on this PowerFlex 700 drive?
A DC-bus overvoltage condition commonly occurs when the motor regenerates energy during rapid deceleration. High-inertia loads can return significant energy to the drive when their speed is reduced quickly. Since the 20BW142A0ANNANC0 does not contain an internal brake IGBT or braking resistor, the first step is to review the deceleration time and load characteristics. Increasing the deceleration time can reduce the rate at which regenerative energy is returned to the DC bus. If the machine requires frequent rapid stopping, an external braking solution or another method of handling regenerative energy may be necessary. The DC input voltage should also be checked to ensure it remains within the required operating range.

7. What is the maximum output frequency of the 20BW142A0ANNANC0?
The maximum programmable output frequency is 420 Hz. However, this value represents the drive’s maximum output capability and should not automatically be treated as the permissible operating frequency of the connected motor. High-frequency operation can increase motor speed beyond its mechanical design limits and may affect bearings, rotor balance, cooling, insulation stress, and the driven machine. Before operating above the motor’s base frequency, the motor manufacturer’s maximum speed rating should be confirmed. The mechanical system should also be checked for critical-speed or resonance conditions that could occur at elevated operating speeds.

8. What should be checked when installing and commissioning the 20BW142A0ANNANC0?
Before energizing the drive, verify the 932 V DC supply, protective devices, grounding system, power connections, motor connections, and control wiring. The motor rating should be compatible with the drive’s 142 A continuous output capability, and all motor nameplate information should be entered correctly. Because this is a high-voltage, high-power drive, DC-bus discharge and electrical safety procedures must be followed carefully during installation and maintenance. During initial commissioning, start with a controlled low-speed test and verify motor direction, output current, acceleration, deceleration, and load response. If overcurrent, overvoltage, or unstable speed occurs, investigate the fault code together with motor parameters, load characteristics, acceleration/deceleration settings, and control-mode configuration.