Technical Specifications

FAQ

1. What is the rated output current of the Allen Bradley 20BF119A0ANNANC0?

The 20BF119A0ANNANC0 PowerFlex 700 AC Drive has a continuous normal-duty output current rating of 119 A at 690 VAC, three-phase. It can provide 131 A for one minute and 179 A for three seconds under the specified heavy-duty overload conditions. The drive is rated for 110 HP normal-duty applications and 90 HP heavy-duty applications.

When selecting the drive for a motor, the motor nameplate current should be compared with the drive’s continuous current rating. Motor horsepower alone is not sufficient for proper sizing, especially when the application involves high starting torque, frequent acceleration, rapid deceleration, or significant load fluctuations.

2. What is the input voltage requirement for the 20BF119A0ANNANC0?

The 20BF119A0ANNANC0 is designed for a 690 VAC, three-phase, 50 Hz power supply. Its rated input current is approximately 94.7 A, with an input power rating of approximately 137 kVA under normal-duty conditions.

Before commissioning, the incoming power supply should be checked for correct voltage, phase sequence, grounding, and acceptable voltage balance. The upstream protection equipment must also be correctly selected for the drive’s electrical rating. Stable input power is particularly important for high-power applications because significant voltage fluctuations can result in undervoltage or overvoltage protection.

3. What motor control modes are supported by the 20BF119A0ANNANC0?

The drive supports sensorless vector control, V/Hz control, and vector control. Sensorless vector control can provide improved speed and torque performance without requiring an encoder, making it suitable for many industrial motor applications.

For vector control operation, accurate motor nameplate information should be entered during commissioning. Important parameters include motor voltage, rated current, frequency, speed, and power. Incorrect motor data can lead to excessive current, unstable speed, insufficient torque, or poor acceleration performance.

For applications requiring precise low-speed operation or highly accurate closed-loop control, an appropriate feedback option may be considered.

4. Does the 20BF119A0ANNANC0 have an internal braking resistor?

No. The 20BF119A0ANNANC0 is configured without an internal brake resistor and without a brake IGBT. Therefore, applications with large inertial loads or frequent rapid deceleration should be evaluated carefully before installation.

During deceleration, the motor can operate as a generator and return energy to the DC bus. If the regenerated energy causes the DC bus voltage to rise beyond its allowable level, the drive can generate an overvoltage fault.

For high-inertia conveyors, centrifuges, hoists, winding equipment, and other applications requiring rapid stopping, an appropriate external braking or regenerative energy solution should be considered.

5. Does the 20BF119A0ANNANC0 support encoder feedback?

The standard configuration is supplied without feedback. This allows the drive to operate using sensorless vector control without an external encoder for many general-purpose applications.

If the machine requires highly accurate speed regulation, low-speed torque control, synchronization, or closed-loop operation, an appropriate encoder feedback option may be required. The PowerFlex 700 platform supports incremental dual-channel encoder configurations when the appropriate feedback hardware is installed.

When replacing an existing drive, it is important to check whether the original system relies on encoder feedback. Removing feedback from a closed-loop application without redesigning the control strategy can significantly affect speed accuracy and low-speed performance.

6. How can the 20BF119A0ANNANC0 be integrated with a PLC or DCS?

The 20BF119A0ANNANC0 provides six digital inputs, three digital outputs, two analog inputs, and two analog outputs for integration with industrial control systems. These I/O points can be used for start/stop commands, direction control, speed references, running status, fault signals, and other process signals.

For example, an analog input can be used for a speed reference from a PLC, while digital inputs can handle start, stop, or enable commands. Digital outputs can provide running or fault status back to the control system.

The catalog configuration does not include an internal communication module. If network-based control is required, a compatible communication option should be selected according to the PLC or DCS architecture and required industrial protocol.

7. What should be checked if the 20BF119A0ANNANC0 trips on overcurrent?

The first step is to identify when the overcurrent occurs. If the fault happens immediately during startup, check the motor nameplate parameters, motor wiring, output connections, and mechanical condition. A mechanically locked or heavily loaded motor can cause the drive current to rise rapidly.

If the fault occurs during acceleration, check whether the acceleration time is too short for the connected load. Large-inertia machinery may require a longer acceleration period to prevent excessive current demand.

For overcurrent during normal operation, inspect the motor, motor cable, mechanical transmission, bearings, and driven equipment. Sudden process-load increases can also cause current spikes.

The drive provides a programmable proactive current limit from approximately 20–160% of rated output current, while the instantaneous current limit is approximately 220–300% of rated current depending on the drive rating. Persistent faults after external causes have been eliminated may require inspection of the drive’s power and control sections.

8. How should the acceleration and deceleration times be configured?

The 20BF119A0ANNANC0 allows independently programmable acceleration and deceleration times from 0 to 3600 seconds, with 0.1-second increments. The correct settings depend on motor inertia, mechanical load, required production cycle, and regenerative energy during deceleration.

An acceleration time that is too short can cause excessive motor current and trigger overcurrent protection. Conversely, an excessively short deceleration time can cause regenerated energy to raise the DC bus voltage and result in an overvoltage fault.

During commissioning, it is advisable to start with conservative acceleration and deceleration values and gradually optimize them while monitoring motor current, speed response, and fault conditions. For high-inertia machinery, the deceleration setting should be selected with particular attention to the regenerative energy generated by the load.