Bosch Rexroth DKC03.3-040-7-FW Servo Drive for IndraDrive

Bosch Rexroth DKC03.3-040-7-FW Servo Drive for IndraDrive

The Bosch Rexroth DKC03.3-040-7-FW is a high-performance AC servo drive controller engineered for seamless integration within the IndraDrive modular control architecture. Designed to operate as a coordinated node across multi-axis motion systems, this drive unit delivers precise torque and velocity regulation while maintaining full compatibility with the broader Rexroth automation ecosystem. Rather than functioning as a standalone component, the DKC03.3-040-7-FW is conceived as a system-compatible element — one that contributes to control consistency, axis synchronization, and long-term maintainability across complex industrial installations.

In modern layered automation environments, servo drives occupy a critical position between the motion controller layer and the mechanical execution layer. The DKC03.3-040-7-FW bridges these layers by accepting real-time motion commands from an IndraDrive controller such as the HCS02 or HCS03 power supply unit, processing them through its integrated firmware, and delivering precisely regulated current output to the connected servo motor. This architecture ensures that every axis in the system responds with consistent dynamic behavior, reducing commissioning time and improving overall system predictability.

The drive supports SERCOS II fiber-optic communication, which provides deterministic, noise-immune data exchange between the controller and each drive node. This communication backbone is essential in high-axis-count systems where timing jitter or signal degradation could compromise synchronization. When paired with the Rexroth IndraControl L or IndraControl V controller platforms, the DKC03.3-040-7-FW participates in a fully coordinated motion network where position, velocity, and torque data are exchanged at fixed cycle times, enabling electronic gearing, cam profiling, and multi-axis interpolation without additional hardware.

From a power architecture perspective, the DKC03.3-040-7-FW is designed to operate within a shared DC bus configuration. The HCS02.1E or HCS03.1E regenerative power supply feeds the common DC link, from which multiple DKC drive axes draw their operating power. This topology reduces overall operating load, simplifies cabinet wiring, and allows regenerative braking energy from decelerating axes to be redistributed to accelerating axes within the same bus segment. The result is a more energy-efficient and thermally stable drive cabinet, particularly in applications with high-duty-cycle motion profiles.

For I/O integration, the DKC03.3-040-7-FW interfaces with the system’s digital and analog I/O layer through the IndraDrive firmware parameter set. Drive-level I/O — including enable signals, fault outputs, and reference inputs — can be mapped to the controller’s I/O modules such as the Rexroth CML65 or external Profibus/PROFINET I/O stations, depending on the network topology. This flexibility allows system architects to distribute I/O across the cabinet without duplicating wiring or introducing additional signal conditioning hardware.

The DKC03.3-040-7-FW is rated at 40A continuous output current, making it suitable for medium-power servo axes in machine tool, packaging, printing, and material handling applications. Its firmware version designation (FW) indicates factory-loaded standard firmware, which supports the full range of IndraDrive operating modes including position control, velocity control, torque control, and drive-controlled positioning. Firmware updates can be applied via the IndraWorks engineering software, ensuring the drive remains compatible with evolving system requirements throughout its service life.

Installation and commissioning follow the standard IndraDrive procedure: the drive is mounted on a DIN rail or panel within the control cabinet, connected to the DC bus via the appropriate bus bar or cable assembly, and linked to the SERCOS ring via fiber-optic patch cables. The IndraWorks DS or IndraWorks MLD software environment is then used to configure axis parameters, tune control loops, and validate motion profiles. This standardized commissioning workflow reduces the expertise barrier for field engineers and ensures consistent results across multiple machine installations.

Long-term maintenance of the DKC03.3-040-7-FW benefits from Bosch Rexroth’s extensive spare parts ecosystem. Compatible components including the MSK servo motor series, the LSA capacitor module for DC bus buffering, the NFD noise filter for EMC compliance, and the HAS01 accessory kit for cable management are all available through authorized distribution channels. This parts availability ensures that maintenance teams can address component-level failures without replacing entire drive assemblies, reducing lifecycle costs and minimizing unplanned downtime.

Every DKC03.3-040-7-FW unit supplied through ZYPLC is covered by a warranty terms confirmed during quotation, providing assurance of functional integrity from the date of delivery. Our technical team supports system integration — meaning we assist customers in verifying drive compatibility within their specific system architecture, including firmware version alignment, DC bus sizing, SERCOS ring configuration, and cabinet thermal management. This service-oriented approach ensures that the drive is not simply delivered, but successfully deployed within the customer’s control environment.

Product Specification Table

System Compatibility Notes

The DKC03.3-040-7-FW achieves its full performance potential when deployed as part of a coordinated IndraDrive system rather than as an isolated axis. A typical multi-axis installation begins with the HCS03.1E regenerative power supply, which conditions incoming three-phase AC power and maintains a stable DC bus voltage for all connected drive axes. Adjacent to the power supply, multiple DKC03.3 drive modules share the DC bus through a common bus bar assembly, with each axis independently controlled via the SERCOS II ring.

At the controller level, the IndraControl L45 or L65 motion controller manages the SERCOS master function, issuing synchronized motion commands to each DKC axis at fixed cycle times as short as 250 microseconds. This deterministic communication eliminates the timing variability associated with fieldbus-based motion control and enables true multi-axis interpolation. For applications requiring safety-rated motion, the IndraDrive Cs safety option module can be integrated to provide STO (Safe Torque Off) and SS1 (Safe Stop 1) functions in compliance with IEC 62061 and ISO 13849.

On the motor side, the DKC03.3-040-7-FW is optimized for use with Bosch Rexroth MSK servo motors, which incorporate integrated encoder feedback (typically EnDat 2.1 or resolver) for closed-loop position control. The motor cable and encoder cable are routed through the HAS01 cable management accessory, which organizes wiring within the cabinet and reduces the risk of EMC interference. An NFD noise filter installed at the AC input of the HCS power supply ensures compliance with EN 61800-3 EMC requirements, protecting both the drive system and adjacent equipment from conducted emissions.

For systems requiring expanded I/O capability, the Rexroth CML65 I/O module or a Profibus DP gateway can be added to the control network, allowing the motion controller to interface with process-level sensors, actuators, and safety relays without additional PLCs. In larger installations, an IndraControl XM22 or XM42 modular controller may replace the L-series controller to provide expanded axis count and integrated PLC functionality within a single hardware platform. The LSA capacitor module can be added to the DC bus to provide short-term energy buffering during power interruptions, protecting in-process operations from brief supply disturbances.

Industrial Application Notes

The DKC03.3-040-7-FW is deployed across a wide range of industrial sectors where precise, coordinated motion control is essential to process quality and throughput. In machine tool applications — including CNC machining centers, grinding machines, and gear hobbing equipment — the drive controls feed axes and spindle orientation with the sub-micron repeatability required for tight dimensional tolerances. The SERCOS II communication protocol ensures that all axes remain synchronized during complex contouring operations, preventing the positional errors that would otherwise result from asynchronous command delivery.

In packaging and converting machinery, the DKC03.3-040-7-FW manages registration control, web tension regulation, and cut-to-length positioning across multi-axis lines. The drive’s torque control mode is particularly valuable in tension-sensitive applications such as film winding and label application, where maintaining consistent web tension across varying line speeds is critical to product quality. The shared DC bus architecture reduces cabinet size and heat generation in these often space-constrained machine designs.

Within power generation and energy infrastructure applications, including wind turbine pitch control and hydroelectric governor systems, the drive’s robust firmware and deterministic communication support the high-reliability motion control requirements of safety-critical installations. The warranty terms confirmed during quotation and global spare parts availability are especially valued in these applications, where unplanned downtime carries significant operational and financial consequences.

In process industries such as petrochemical, water treatment, and mining, the DKC03.3-040-7-FW is used in pump drive systems, conveyor positioning, and valve actuator control where precise speed regulation and fault-tolerant operation are required. The drive’s integrated diagnostic functions — accessible via IndraWorks or the SERCOS parameter interface — allow maintenance teams to monitor drive health, log fault histories, and perform predictive maintenance without interrupting production.

Product Compatibility FAQ

Q1: Is the DKC03.3-040-7-FW compatible with both IndraDrive M and IndraDrive Cs system architectures?
The DKC03.3-040-7-FW belongs to the IndraDrive M (modular) product family and is designed for use within shared DC bus configurations managed by an HCS-series power supply. It is not directly interchangeable with IndraDrive Cs (compact single-axis) units, which have a different mechanical form factor and power connection scheme. However, both families share the same SERCOS II communication protocol and IndraWorks engineering environment, allowing them to coexist within the same control network when managed by a compatible IndraControl master controller.

Q2: What firmware version is required for compatibility with IndraControl L45/L65 controllers, and how is firmware updated in the field?
The DKC03.3-040-7-FW ships with standard FW firmware pre-loaded at the factory. Compatibility with specific IndraControl L-series firmware versions should be verified using the Bosch Rexroth compatibility matrix available through the IndraWorks project configuration tool. Firmware updates are performed via the IndraWorks DS software over the SERCOS interface or via a direct serial connection to the drive’s diagnostic port. ZYPLC’s technical support team can assist with firmware version verification and update procedures as part of the system integration service included with the warranty terms confirmed during quotation.

Q3: What is covered under the warranty terms confirmed during quotation, and what support is available for long-term spare parts supply?
The warranty terms confirmed during quotation provided by ZYPLC covers functional defects in the DKC03.3-040-7-FW unit under normal operating conditions, including failures attributable to component-level faults within the drive electronics. The warranty does not cover damage resulting from incorrect installation, overvoltage events, or operation outside the specified environmental parameters. For long-term spare parts support, ZYPLC supports RFQ sourcing for DKC03.3-series drives and compatible components including HCS power supplies, MSK servo motors, and NFD filters. Customers are encouraged to contact our technical team to discuss multi-unit stocking agreements and planned maintenance schedules that minimize exposure to extended lead times on critical spare parts.