Technical Specifications

FAQ

1. What is the rated output current of the 20BC125A3ANNACC0?

The 20BC125A3ANNACC0 has a rated output current of 125 A and is designed for three-phase industrial motor control applications. Its normal-duty rating is 55 kW, while the heavy-duty rating is 45 kW. When selecting the drive for a motor, the motor nameplate current should be used as the primary sizing reference rather than relying only on the motor power rating. The actual load profile, starting torque, acceleration requirements, operating cycle, and environmental conditions should also be considered to ensure that the drive operates within its intended rating.

2. What type of input power does the 20BC125A3ANNACC0 require?

The drive is designed for a three-phase 380–480 VAC power supply, with 400 VAC as the nominal line voltage and a 50 Hz mains frequency. The incoming power system should remain within the specified voltage range and should have suitable protection and grounding. During installation, the upstream disconnect, fuses or circuit protection, power cables, grounding conductors, and motor wiring should be selected according to the actual installation requirements. Stable input power is particularly important in high-power motor applications because significant voltage disturbances can affect drive operation and may lead to protective trips.

3. What communication interface is provided on the 20BC125A3ANNACC0?

This configuration includes a ControlNet coaxial internal communication module. It can therefore be used in automation systems where ControlNet communication is required for exchanging control commands, status information, speed references, and other drive data with a compatible control system. Before commissioning the network, the ControlNet connection, node configuration, network architecture, and controller data mapping should be checked carefully. The drive’s communication parameters must also correspond to the configuration used by the control system. If the application requires another communication protocol, the actual installed hardware and available option compatibility should be verified before system integration.

4. Does the 20BC125A3ANNACC0 include a braking resistor?

The 20BC125A3ANNACC0 does not include an internal braking resistor and is specified without a Brake IGBT. This is an important consideration for applications involving high-inertia loads, rapid stopping, or frequent acceleration and deceleration. During braking, the motor can return regenerative energy to the drive’s DC bus, causing the DC bus voltage to increase. If the regenerative energy exceeds the system’s ability to dissipate or manage it, a DC bus overvoltage fault may occur. For applications requiring short stopping times, the braking requirements should therefore be evaluated during system design.

5. How should an overcurrent fault be diagnosed on the 20BC125A3ANNACC0?

Troubleshooting should begin by identifying the operating condition in which the overcurrent occurs. If the fault appears during startup or acceleration, check whether the acceleration time is too short or whether the machine requires excessive starting torque. If the fault occurs during normal operation, inspect the driven machinery for mechanical binding, excessive friction, blocked components, or abnormal load increases. The motor cable connections should also be checked for loose terminals, incorrect phase connections, or insulation problems. In addition, verify that the programmed motor voltage, current, frequency, and speed data correspond to the actual motor nameplate. Repeated faults should be investigated systematically rather than simply increasing current limits.

6. How can the 20BC125A3ANNACC0 be integrated with a PLC or industrial control system?

The drive can be integrated into an industrial control system using its available 24V I/O and ControlNet communication capability. Digital inputs can be assigned to commands such as start, stop, direction, and fault reset, while analog inputs can be used for speed or process references. Status and fault information can be returned through the available outputs or communication network. When ControlNet is used, the network configuration and controller data mapping must be established correctly before commissioning. Each control command should be tested individually, including start/stop logic, speed reference, fault handling, and drive status feedback, to ensure that the PLC and drive respond correctly under both normal and fault conditions.

7. What can cause a DC bus overvoltage fault on the 20BC125A3ANNACC0?

DC bus overvoltage is commonly associated with regenerative energy generated during motor deceleration. High-inertia loads, short deceleration times, and frequent braking cycles can return significant energy to the drive’s DC bus. The first troubleshooting step is to determine whether the fault occurs consistently during deceleration. If it does, check the programmed deceleration time and compare it with the mechanical characteristics of the load. Extending the deceleration time may reduce the amount of regenerative energy generated. If the application requires rapid stopping and the fault continues, an appropriate external braking or regenerative energy management solution may be necessary. The incoming AC voltage should also be checked for abnormal conditions.

8. What installation considerations are important for the 20BC125A3ANNACC0?

Proper installation is important because this is a high-power AC drive with substantial motor current capability. Adequate cabinet ventilation should be provided, and the cooling airflow around the drive should not be obstructed. Power wiring should be routed separately from sensitive control and communication wiring where practical to reduce electrical interference. The motor cable, grounding system, and ControlNet communication wiring should be installed according to the requirements of the overall control system. Because this configuration includes an EMC filter and common-mode choke, correct grounding and cable routing are particularly important for maintaining reliable EMC performance. Before energizing the drive, all power, motor, control, communication, and grounding connections should be inspected and verified.