Modular Integration for Advanced Automation

The Rexroth BGR DKC02.3-LK SCK02/01 is a high-performance digital drive assembly designed to meet the rigorous demands of the modern industrial landscape. This assembly integrates the reliable ECODRIVE3 DKC series hardware with the specialized SCK interface module, creating a unified solution for high-speed motion control. In the context of Industry 4.0, where synchronization and data transparency are paramount, the BGR DKC02.3-LK serves as the intelligent core for managing AC servo motors in safety-critical and high-dynamic applications.

The "BGR" designation refers to a pre-configured assembly (Baugruppe), ensuring that the controller and the interface module are electrically and mechanically harmonized. By utilizing the SERCOS interface standard, this unit communicates via fiber-optic cables, effectively eliminating electrical noise and enabling extremely fast update rates for position, velocity, and torque commands. This makes it an ideal choice for complex machinery requiring the coordination of multiple axes with sub-millisecond precision.

Core Functional Intelligence and Design

The Power of the SCK02/01 Module

The SCK02/01 module is a critical component within this BGR assembly. It acts as the bridge for high-fidelity signal interpretation. Its primary role involves the processing of feedback signals and the management of localized I/O requirements that are essential for precise motor commutation. In many Rexroth architectures, the SCK module allows for specialized encoder interfaces, enabling the DKC02.3 base unit to interpret high-resolution data from various motor feedback systems, including optical and capacitive encoders.

SERCOS Interface Logic (DKC02.3-LK)

The "LK" variant of the DKC02.3 is specifically built for the fiber-optic ring topology of SERCOS. Unlike traditional copper-based fieldbuses, the fiber-optic SERCOS interface provides absolute immunity to electromagnetic interference (EMI). This is particularly advantageous in environments with large motors, welding equipment, or heavy switching loads. The DKC02.3-LK ensures that the control loop is closed with deterministic timing, providing a stable foundation for complex motion profiles such as electronic cams and synchronized gears.

Figure 2: Multi-axis synchronization via SERCOS fiber-optic ring network.

Advanced Performance Features

Dynamic Control Loops

The BGR assembly features a high-speed Digital Signal Processor (DSP) that executes the velocity and position loops at high frequencies. This minimizes "following error" and allows for high gains without compromising system stability. The integrated power stage utilizes advanced IGBT (Insulated Gate Bipolar Transistor) technology to provide clean current to the motor, reducing harmonic distortion and acoustic noise during operation.

Thermal Management and Durability

Designed for long-term industrial service, the assembly features optimized internal airflow and heat sinks. The SCK02/01 module is mounted in a way that allows for maximum thermal dissipation away from the sensitive control electronics. The unit also includes internal monitoring of the DC bus and power stage temperature, initiating a controlled shutdown if environmental limits are exceeded, thereby protecting the hardware from permanent damage.

Typical Industry Applications

The versatility of the Rexroth BGR DKC02.3-LK SCK02/01 makes it a preferred choice for precision-focused industries:

• Packaging Machinery: Coordinating multiple axes for high-speed wrapping, labeling, and palletizing where microsecond timing is required.

• Automotive Assembly: Driving robotic joints and precision positioning tables for welding and component placement.

• Metalworking and CNC: Managing auxiliary axes in machining centers that require high stiffness and accuracy.

• Printing Industry: Ensuring perfect registration and tension control in high-speed web processing lines.

Installation and Commissioning Guidelines

For optimal performance, the Rexroth BGR DKC02.3-LK SCK02/01 should be installed vertically within a climate-controlled control cabinet. It is essential to maintain the specified clearance above and below the unit to ensure adequate air circulation. When connecting the fiber-optic SERCOS cables, care must be taken to respect the minimum bend radius to prevent signal attenuation. Rexroth recommends using original pre-assembled cables for the motor power and feedback connections to maintain EMC compliance and prevent signal degradation.

During commissioning, the "electronic nameplate" feature of the Rexroth MKD/MHD motors allows the DKC02.3 unit to automatically detect the motor parameters, significantly reducing setup time. However, a manual fine-tuning of the load-dependent parameters is recommended to achieve the highest possible Cpk (Process Capability Index) for the specific machine application. By adhering to these engineering standards, the BGR DKC02.3-LK assembly provides a robust, low-maintenance motion control solution for decades of operation.