Allen Bradley 20BC140G0ANNANC0 PowerFlex 700 AC DriveTechnical Specifications

FAQ

1. What are the input voltage and rated output current of the 20BC140A3ANNAND0?

The 20BC140A3ANNAND0 is designed for three-phase AC power systems with a 380–480 V input voltage range and a nominal line voltage of 400 V AC. The drive provides a rated output current of 140 A and is intended for industrial three-phase AC motor control applications. When selecting the drive for a motor, the motor’s rated current should be compared directly with the drive’s output current rating. Motor voltage, operating frequency, duty cycle, overload requirements, acceleration and deceleration requirements should also be considered to ensure that the drive has sufficient capacity for the actual application.

2. What is the maximum output frequency of the 20BC140A3ANNAND0?

The maximum output frequency of the 20BC140A3ANNAND0 is 420 Hz. This provides considerable flexibility for applications requiring operation above the standard 50 Hz or 60 Hz motor frequency. However, the maximum frequency setting should be determined according to the motor manufacturer’s specifications and the mechanical limitations of the connected equipment. Operating a motor at a frequency substantially above its rated frequency can increase rotational speed and may affect available torque, cooling performance, bearings, and mechanical components. The maximum frequency should therefore be configured according to the actual motor and machine requirements rather than simply using the highest available setting.

3. Does the 20BC140A3ANNAND0 include an internal braking resistor?

No. The 20BC140A3ANNAND0 does not have an internal braking resistor, and the specified configuration does not include a brake IGBT. This is particularly important when the drive is used with high-inertia loads or applications requiring frequent and rapid deceleration. During deceleration, the motor can return energy to the drive’s DC bus, causing the DC-bus voltage to rise. If the application requires controlled rapid stopping, the braking requirements should be evaluated during system design. An appropriate external braking solution may be required depending on the motor size, load inertia, deceleration time, stopping frequency, and regenerated energy.

4. What I/O functions are available on the 20BC140A3ANNAND0?

The 20BC140A3ANNAND0 provides six digital inputs, three digital outputs, two analog inputs, and two analog outputs. These I/O points can be used for integrating the drive with external control equipment such as PLCs, relays, sensors, operator control stations, and process control systems. Digital inputs can be assigned to functions such as start, stop, enable, direction, fault reset, or preset speed commands, while analog inputs can be used for speed or process references. The analog and digital outputs can provide operating status, feedback, or other control information. The exact terminal assignments and parameter configuration should be verified during commissioning to ensure that the external control system operates correctly.

5. Which communication protocols are supported by the 20BC140A3ANNAND0?

The PowerFlex 700 platform supports several industrial communication technologies, including DeviceNet, EtherNet/IP, PROFIBUS, CAN, Modbus, TCP/IP, and LON, depending on the communication option installed and the final system configuration. The 20BC140A3ANNAND0 itself is specified without an internal communication module, so the required communication functionality may require an appropriate external or optional communication adapter. When integrating the drive into a PLC or SCADA system, the communication hardware, network address, data configuration, control source, reference source, and communication timeout parameters should all be checked. Correct configuration ensures that speed commands, start/stop commands, drive status, alarms, and diagnostic information can be exchanged reliably.

6. How should the 20BC140A3ANNAND0 be commissioned for a new motor?

Before commissioning, verify the incoming three-phase supply, motor cable connections, grounding, protective devices, control wiring, and communication connections. The motor nameplate information should then be entered accurately into the drive parameters, including rated voltage, rated current, rated frequency, and rated speed. The initial test should normally be performed at a low operating frequency to verify the motor’s rotation direction and confirm that the motor current is within an expected range. Acceleration and deceleration times should be adjusted according to the inertia and characteristics of the connected machine. If the drive is controlled by a PLC, start, stop, direction, speed reference, fault indication, and reset functions should be tested individually. After initial testing, the drive should be operated under the actual process load while monitoring current, speed, temperature, and fault conditions.

7. What should be checked if the 20BC140A3ANNAND0 experiences an overcurrent or overload fault?

An overcurrent or overload condition should be investigated systematically rather than immediately replacing the drive. First check whether the motor or driven machine has mechanical resistance, a jammed mechanism, excessive friction, damaged bearings, or an unusually high process load. The motor cables and terminals should then be inspected for incorrect phase connections, loose terminals, insulation damage, or short circuits. The drive parameters should also be compared with the motor nameplate data to ensure that rated voltage, current, frequency, and speed have been entered correctly. If the fault occurs during acceleration, the acceleration time may be too short for the load. If it occurs during deceleration, the load’s inertia and regenerative energy should be evaluated. Reviewing the drive’s fault history and operating conditions immediately before the fault can help determine whether the problem is related to the motor, mechanical load, parameter configuration, or power system.

8. What environmental conditions should be considered when operating the 20BC140A3ANNAND0?

The 20BC140A3ANNAND0 is specified for operation at up to 40 °C at 400 V AC, with a storage temperature down to -40 °C. The specified relative humidity range is 5–95% without condensation, and the maximum installation altitude without derating is 1000 m. Installation should provide adequate ventilation and sufficient clearance around the drive to allow heat generated during operation to dissipate effectively. Excessive ambient temperature, restricted airflow, dust accumulation, moisture, or installation at higher altitude can affect thermal performance and long-term reliability. For installations outside the standard environmental conditions, the application should be evaluated for the appropriate derating or additional enclosure and cooling requirements.