Bosch Rexroth RD52.1-4B-011-L-NN-NN-NN-FW AC Servo Drive – IndraDrive Cs

Bosch Rexroth RD52.1-4B-011-L-NN-NN-NN-FW — Single-Axis Compact Servo Drive in the IndraDrive Cs Platform

The Bosch Rexroth RD52.1-4B-011-L-NN-NN-NN-FW is a single-axis AC servo drive belonging to the IndraDrive Cs (Compact Single-axis) product family. Designed for cabinet-integrated motion control applications where panel space is constrained and thermal management is critical, this unit operates on a three-phase 400 V AC supply and delivers a continuous output current of 11 A. The liquid-cooled housing variant — denoted by the “L” position in the part number — allows the drive to sustain rated current output in thermally dense enclosures without relying on forced-air convection, a significant advantage in sealed or wash-down environments.

Within the IndraDrive Cs architecture, the RD52.1 platform handles the complete servo loop — current, velocity, and position — internally, with cycle times that support high-bandwidth torque control. The drive communicates with the motion controller via SERCOS III or PROFINET RT depending on the firmware variant loaded, enabling deterministic real-time data exchange at sub-millisecond update rates. The integrated STO (Safe Torque Off) function, certified to SIL 2 / PLd per IEC 62061 and EN ISO 13849-1, removes the requirement for external safety contactors on the motor power circuit, reducing both panel wiring complexity and the number of safety-rated components in the cabinet.

The RD52.1-4B-011-L-NN-NN-NN-FW is parameterized and commissioned using Bosch Rexroth’s IndraWorks Engineering software, which shares a common toolchain with the broader IndraDrive M and IndraDrive Mi families. This means engineering teams already familiar with the IndraDrive ecosystem can deploy this unit without relearning parameter structures or diagnostic workflows. The drive’s onboard web server provides real-time status monitoring and fault diagnostics accessible via standard Ethernet, eliminating the need for a dedicated handheld programmer during commissioning or troubleshooting.

Applications for this drive span high-cycle packaging machinery, precision CNC feed axes, semiconductor handling equipment, and servo-driven injection molding axes — any application where a compact, thermally stable, fieldbus-integrated servo drive is required at the 11 A continuous current rating.

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Technical Parameters

Hardware Logical Analysis

The RD52.1-4B-011-L-NN-NN-NN-FW implements a three-tier control loop hierarchy — current loop, velocity loop, and position loop — each executing at independent cycle rates. The current loop, operating at the innermost level, runs at a fixed PWM switching frequency that determines the torque ripple floor and the bandwidth ceiling of the velocity controller above it. Bosch Rexroth’s IndraDrive Cs platform is designed so that the current controller bandwidth exceeds 1 kHz, which allows the velocity loop to operate with a proportional gain high enough to suppress mechanical resonances in the 200–400 Hz range without inducing instability.

The liquid cooling interface on the “L” variant uses a cold plate integrated into the drive’s heatsink structure. Coolant flows through machined channels in direct thermal contact with the IGBT power module, maintaining junction temperatures within the IGBT’s safe operating area even at sustained 11 A output. This approach decouples the drive’s thermal performance from ambient cabinet temperature, which is a critical design consideration in enclosed panels where convection-cooled drives would require derating above 35 °C.

EMC performance is addressed at the hardware level through a multi-layer PCB design with dedicated ground planes, differential signal routing on encoder feedback lines, and common-mode chokes on the motor output stage. The drive’s DC bus capacitor bank is sized to absorb regenerative energy pulses from deceleration events without exceeding the bus voltage clamp threshold, reducing the frequency of regenerative braking resistor activation in applications with moderate inertia loads.

The STO circuit operates on a dual-channel architecture with cross-monitoring. Each channel independently de-energizes the IGBT gate drivers via optocoupler-isolated signal paths. The cross-monitoring logic detects single-channel failures within the diagnostic coverage interval required by SIL 2, and the drive enters a safe state without requiring a power cycle to reset — provided the fault condition is cleared and the STO inputs are re-asserted in the correct sequence.

System Integration Benefits

• Deterministic Fieldbus Latency: SERCOS III communication delivers a guaranteed cycle time jitter below 1 µs, enabling tight multi-axis synchronization without application-layer compensation algorithms.
• Unified Parameter Namespace: The RD52.1 shares the IndraDrive parameter set (P-0-xxxx / S-0-xxxx IDN structure) with IndraDrive M and Mi, allowing parameter templates to be reused across drive families without modification.
• Integrated Encoder Evaluation: The drive accepts resolver, sin/cos encoder, EnDat 2.1/2.2, and Hiperface feedback natively, eliminating external encoder interface modules for most motor types.
• Online Autotuning: The built-in drive-based autotuning routine identifies load inertia and friction coefficients at commissioning, generating initial velocity loop gains without requiring manual iterative tuning.
• Diagnostic Transparency via Web Server: The onboard Ethernet port hosts a web-based diagnostic interface displaying real-time current, velocity, position error, and active fault codes — accessible from any browser on the same network segment without additional software.
• STO Without External Contactors: Eliminating the motor-side safety contactor reduces the number of safety-rated components in the panel, lowers panel assembly cost, and removes a mechanical wear item from the safety circuit.
• Scalable Drive Topology: The IndraDrive Cs can be combined with a shared DC bus supply module, allowing multiple axes to exchange regenerative energy on the common bus and reducing total power draw from the AC supply during mixed acceleration/deceleration cycles.
• IndraWorks Integration: Full integration with the IndraWorks Engineering environment provides oscilloscope-grade signal recording, parameter comparison across drive instances, and automated firmware update management from a single workstation.

Quality Assurance & Global Logistics

Every Bosch Rexroth RD52.1-4B-011-L-NN-NN-NN-FW unit dispatched from our Xiamen, China facility undergoes a structured pre-shipment inspection protocol. Part number encoding is verified character-by-character against the Bosch Rexroth product catalog. Manufacturer date codes, housing markings, and label integrity are inspected under controlled lighting. Connector pins and liquid cooling port threads are checked for mechanical damage. Where test equipment is available, the drive is powered and basic communication handshake and status register checks are performed before packaging.

Units are packed in anti-static polyethylene bags, enclosed in custom-cut polyethylene foam inserts, and placed in double-wall corrugated cartons rated for international freight handling. Moisture-barrier desiccant packs are included for shipments to humid climates. Each carton is labeled with the part number, serial number (where applicable), and destination customs data to streamline import clearance.

Logistics from Xiamen port covers DHL Express (3–5 business days to most destinations), FedEx International Priority, and sea freight consolidation for bulk orders. Export documentation — commercial invoice, packing list, certificate of origin, and ECCN classification where required — is prepared in-house and provided with every shipment. We have shipped industrial automation components to customers in Europe, Southeast Asia, the Middle East, and the Americas, with a documented on-time delivery rate above 97 % for express shipments.

A 12-month warranty against manufacturing defects is provided on all genuine new units. Warranty claims are processed with a target response time of 48 business hours from receipt of the defective unit at our facility.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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