Bosch Rexroth SM-10-20-TA-055128-111 AC Servo Drive Module – Indramat Series

Bosch Rexroth SM-10-20-TA-055128-111 — Torque/Velocity Axis Module in the Indramat Modular Drive Architecture

The SM-10-20-TA-055128-111 is a dual-mode servo axis module produced by Bosch Rexroth under the legacy Indramat drive platform. It is rated at 10 A continuous output current with a 20 A peak burst capacity, and operates in simultaneous torque and velocity control mode — the designation suffix “TA” explicitly encodes this dual-loop capability. The module slots into the Indramat modular drive rack alongside TVD or TVM series DC bus power supply modules, sharing a common backplane for power distribution, fault signaling, and inter-module communication. Its role in a servo control loop is to receive velocity or torque commands from the upstream CNC or motion controller, close the current and velocity loops internally at high bandwidth, and deliver precisely regulated phase currents to the connected AC servo motor. This architecture offloads real-time current regulation from the CNC, enabling deterministic axis response independent of controller scan cycle jitter.

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Technical Parameters

Hardware Logical Analysis

The SM-10-20-TA-055128-111 implements a three-stage power conversion and control hierarchy. At the input stage, the module draws regulated DC bus voltage from the shared Indramat backplane — typically 540–600 V DC depending on the TVD/TVM supply configuration. The intermediate stage consists of a three-phase IGBT inverter bridge, switching at a fixed carrier frequency to synthesize sinusoidal phase currents via space-vector PWM. The output stage delivers these currents to the motor windings through shielded motor cables, with the shield grounded at the drive end to suppress conducted EMI back onto the bus.

The current control loop closes at the IGBT switching frequency, typically in the range of 4–8 kHz, providing a current loop bandwidth well above the mechanical resonance frequencies of most servo axes. The velocity loop closes at a lower rate, typically 1–4 kHz, using feedback from the resolver or incremental encoder. The TA variant’s dual-loop architecture means both loops are active simultaneously: the velocity loop generates a torque demand, which the torque loop then executes with high fidelity. This cascade structure provides superior disturbance rejection — load torque transients are absorbed within the torque loop before they propagate to the velocity loop, resulting in minimal speed droop under impact loading.

EMC design on the SM series follows Rexroth’s standard practice of separating signal and power ground planes on the PCB, using optocoupler isolation on all digital I/O lines, and routing high-current traces with controlled impedance to minimize radiated emissions. The resolver interface uses differential signal transmission with twisted-pair cabling to reject common-mode noise from the motor cable. Fault detection logic monitors DC bus voltage, phase current magnitude, IGBT junction temperature (via NTC thermistor), and resolver signal integrity — any out-of-range condition triggers a latched fault output and disables the IGBT gate drive within one switching cycle, protecting both the module and the connected motor.

System Integration Benefits

• Drop-in rack compatibility: The SM-10-20-TA-055128-111 occupies a standard Indramat SM-series slot with no mechanical or electrical modification to the existing rack, power supply, or CNC interface wiring — replacement time in a production environment is typically under 30 minutes.
• Deterministic current loop execution: By closing the current loop at the IGBT switching frequency rather than at the CNC scan rate, the module decouples axis torque response from controller cycle time, enabling consistent dynamic performance regardless of CNC load.
• Dual-loop torque/velocity control: The TA architecture allows the CNC to issue either velocity or torque commands without reconfiguring the drive, supporting both position-controlled and force-controlled applications on the same hardware platform.
• Resolver and encoder flexibility: Native support for both resolver and incremental encoder feedback eliminates the need for external signal converters when integrating motors from different generations of the Rexroth/Indramat motor catalog.
• Onboard fault diagnostics: LED status indicators and a fault code register provide field-readable diagnostic data without requiring a laptop or programming device, reducing mean time to repair (MTTR) in production environments.
• Shared DC bus architecture: Operating from a common DC bus shared with other axis modules allows regenerative energy from decelerating axes to be absorbed by accelerating axes within the same rack, reducing net energy draw from the AC supply and lowering heat dissipation in the power supply module.
• Thermal management: The module’s internal NTC-based temperature monitoring and automatic derating logic prevent thermal shutdown during sustained high-duty-cycle operation, maintaining axis availability without requiring external thermal interlocks.
• Legacy system longevity: For CNC machine tools and production lines built on the Indramat platform, the SM-10-20-TA-055128-111 extends operational life without requiring a full drive system retrofit, preserving the existing CNC, motor, and cabling investment.

Quality Assurance & Global Logistics

Every SM-10-20-TA-055128-111 unit supplied by siemensplc.com is sourced as genuine Bosch Rexroth original hardware — no third-party remanufactured or counterfeit components. Prior to shipment, each unit undergoes a structured inspection protocol: visual examination of PCB condition, connector integrity, bus bar contact surfaces, and housing; functional power-on test under representative load conditions; and documentation of firmware version and parameter state where accessible. Units are packed in anti-static bags with foam-lined cartons rated for international air and sea freight handling.

Shipments originate from our warehouse in Xiamen, China. Xiamen is a designated free-trade port with direct access to major international freight carriers, enabling export documentation — commercial invoice, packing list, and HS 8537.10 customs declaration — to be processed within one business day of order confirmation. Air freight to Europe, North America, Southeast Asia, and the Middle East typically achieves door-to-door transit in 3–7 business days. Sea freight options are available for bulk orders. A 12-month warranty covers functional defects identified under normal operating conditions from the date of shipment. Traceability records are maintained for 36 months post-sale.

Contact Information

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