Rexroth DKC02.3-040-7-FW Servo Drive for IndraDrive

Rexroth DKC02.3-040-7-FW Servo Drive for IndraDrive: Control System Coordination and Upstream-Downstream Synchronization

The Bosch Rexroth DKC02.3-040-7-FW is a high-performance IndraDrive C series servo drive engineered for seamless integration within multi-axis industrial control architectures. Rated at 40A continuous output current and designed for 7th-generation firmware compatibility, this drive module occupies a critical position in the motion control layer of distributed automation systems. Rather than functioning as a standalone component, the DKC02.3-040-7-FW is purpose-built to operate within a coordinated control hierarchy — interfacing with upstream PLCs, peer-level drive modules, shared DC bus power supplies, and downstream servo motor assemblies to deliver synchronized, high-precision motion across demanding industrial environments.

In modern layered automation architectures, the servo drive layer must communicate reliably with the control layer above it and respond deterministically to the mechanical execution layer below. The DKC02.3-040-7-FW achieves this through its SERCOS II fiber-optic interface, enabling real-time cyclic communication with Rexroth IndraControl L and IndraControl V controller platforms. This system integration capability ensures that the drive does not operate in isolation but participates fully in the system’s closed-loop feedback structure — receiving position, velocity, and torque commands from the master controller and returning actual-value data with sub-millisecond latency.

Product Specification Table

System Compatibility Notes

The DKC02.3-040-7-FW achieves its full potential when deployed within a complete Rexroth IndraDrive control cabinet architecture. At the control layer, it receives motion commands from an IndraControl L40 or IndraControl V controller via SERCOS II ring topology, enabling deterministic multi-axis coordination with cycle times as low as 250 µs. In multi-drive configurations, the DKC02.3-040-7-FW operates alongside peer modules such as the DKC01.3-040-7-FW (single-axis variant) and DKC03.3-040-7-FW (enhanced dynamic variant), sharing a common DC bus supplied by HCS02.1E or HCS03.1E regenerative power supply units. This shared bus topology reduces energy consumption and simplifies cabinet wiring by eliminating individual AC rectifier stages per axis.

At the motor interface layer, the DKC02.3-040-7-FW is fully compatible with Rexroth MSK servo motors (MSK050, MSK071, MSK100 series) and MKD synchronous servo motors, supporting resolver and Hiperface encoder feedback for closed-loop position control. For applications requiring absolute positioning, the drive integrates with CSB01.1N or CSH01.1C encoder evaluation modules to extend feedback resolution and support multi-turn absolute encoders without battery backup.

At the network and diagnostic layer, the drive’s RS-232 port connects to IndraWorks DS engineering software running on a commissioning PC, enabling parameter upload/download, oscilloscope trace capture, and firmware update via the FWA-ECODR3-SMT-07VRS-MS firmware package. For cabinet-level EMC compliance, HNF01 or HNK01 mains filters are installed upstream of the power supply modules, while HLC01 line chokes protect against voltage transients on long cable runs. At the I/O interface layer, digital and analog I/O expansion is handled through Rexroth CML65 or Siemens ET 200SP distributed I/O stations connected via PROFIBUS DP or PROFINET, depending on the host controller configuration.

Industrial Application Notes

The DKC02.3-040-7-FW is deployed across a wide range of process-critical and motion-critical industrial sectors. In automotive body-in-white manufacturing, it drives servo-controlled welding gun axes and transfer press feeders where positioning repeatability of ±0.01 mm is mandatory. In packaging and converting lines, the drive synchronizes register control axes across multi-station web-fed machines, maintaining phase coherence between print, cut, and fold stations at speeds exceeding 300 m/min.

In power generation and energy infrastructure, the DKC02.3-040-7-FW controls valve actuator drives in turbine governor systems, where deterministic response time and fail-safe behavior are non-negotiable. In petrochemical and refinery applications, it operates compressor inlet guide vane actuators and pump speed control axes within SIL-rated control loops, interfacing with safety PLCs via hardwired STO (Safe Torque Off) inputs. In water treatment and municipal infrastructure, the drive manages variable-speed pump and blower axes in SCADA-integrated systems, supporting remote parameterization via the SERCOS master controller without requiring local panel access.

In metallurgical and rolling mill applications, the DKC02.3-040-7-FW is used in tension control and looper arm positioning systems, where dynamic stiffness and rapid torque response are essential to maintaining strip quality. In mining and mineral processing, it drives conveyor positioning axes and crusher feed control systems in high-dust, high-vibration environments, supported by IP54-rated enclosure panels with forced-air cooling.

Product Compatibility FAQ

Q1: Is the DKC02.3-040-7-FW compatible with both SERCOS II and analog command interfaces?
The DKC02.3-040-7-FW is primarily a SERCOS II digital drive and does not natively support ±10V analog command input in its standard firmware configuration. For analog interface requirements, the DKC01.3 series with analog interface firmware (FWA-ECODR3-ANL) should be specified instead. In mixed architectures, the SERCOS master controller handles all command distribution, eliminating the need for analog wiring between the PLC and drive layer.

Q2: Can multiple DKC02.3-040-7-FW drives share a single DC bus, and what are the sizing requirements?
Yes. Multiple DKC02.3-040-7-FW drives can be connected to a shared DC bus supplied by an HCS02.1E or HCS03.1E power supply module. Bus sizing must account for the sum of peak regenerative power from all axes during simultaneous deceleration. Rexroth’s IndraSize or DriveSize software tools are used to calculate the required supply module rating, braking resistor capacity, and DC bus capacitance. Typically, a 10–15% derating margin is applied to the calculated peak load to ensure thermal stability under continuous duty cycles.

Q3: What does the warranty terms confirmed during quotation cover, and how is long-term spare parts availability managed?
ZYPLC’s warranty terms confirmed during quotation covers the DKC02.3-040-7-FW against manufacturing defects, component failure under normal operating conditions, and firmware-related functional faults present at the time of shipment. The warranty period begins from the date of invoice. For long-term maintenance planning, ZYPLC maintains buffer stock of DKC02.3 series drives to support planned maintenance shutdowns and emergency replacement requirements. Customers operating large fleets of IndraDrive C axes are advised to maintain at least one spare drive per 10 installed axes, with pre-loaded firmware and parameter sets archived in IndraWorks DS for rapid hot-swap commissioning.