Siemens 6SL3120-1TE31-3AA3 Motor Module – SINAMICS S120

Siemens 6SL3120-1TE31-3AA3 — Single-Axis DC Bus Inverter in the SINAMICS S120 Booksize Drive Train

The Siemens 6SL3120-1TE31-3AA3 is a Single Motor Module within the SINAMICS S120 booksize format, functioning as the final power-conversion stage between the shared DC bus and a connected AC servo or induction motor. Its role in the control loop is unambiguous: it receives a regulated DC link voltage — typically 600 V DC nominal from an Active Line Module — and synthesises a three-phase PWM output whose amplitude, frequency, and phase angle are dictated in real time by the CU320-2 or CU310-2 Control Unit over the DRIVE-CLiQ serial backbone. Without this module, the axis has no torque-generating capability. The 6SL3120-1TE31-3AA3 variant is rated for a continuous output current of 13 A with a peak current of 26 A, making it suited to servo axes in the 4–7.5 kW range under vector or servo control modes.

In a multi-axis SINAMICS S120 cabinet, this module occupies a booksize slot on the DIN rail assembly, drawing DC power from the common bus bar and returning regenerated energy to the same bus during motor deceleration. The shared-bus topology means that braking energy from one axis is directly available to an accelerating axis on the same line module — a thermodynamic efficiency that reduces both heat dissipation requirements and utility draw. The 6SL3120-1TE31-3AA3 participates in this energy exchange passively, with no additional configuration required beyond standard commissioning in TIA Portal or STARTER.

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Technical Parameters

Hardware Logical Analysis

The 6SL3120-1TE31-3AA3 is built around a three-phase IGBT inverter bridge with gate-driver circuitry that operates at a base switching frequency of 4 kHz, selectable up to 16 kHz for applications requiring reduced motor acoustic noise or tighter current ripple. At 16 kHz, the effective current ripple on a 10 mH motor inductance drops below 2 % of rated current, which is significant for precision positioning axes where torque ripple directly translates to contour error.

EMC Architecture: The module integrates a Class C2 conducted-emission filter on the DC bus input side, with common-mode chokes on the AC output lines. The booksize chassis is bonded to the cabinet PE rail through a low-impedance copper strap, ensuring that high-frequency switching transients are shunted to ground before they can propagate into adjacent signal wiring. The IGBT gate drivers incorporate active Miller-clamp circuits to suppress parasitic turn-on during fast switching transitions — a failure mode that, if unmitigated, causes shoot-through faults in the inverter bridge.

DRIVE-CLiQ Physical Layer: The DRIVE-CLiQ interface operates at 100 Mbit/s full-duplex over a proprietary physical layer derived from Fast Ethernet. Each DRIVE-CLiQ frame carries axis setpoint data, actual-value feedback, and diagnostic status in a deterministic 125 µs cycle. The Control Unit timestamps each frame at the hardware level, enabling isochronous operation across all axes on the same DRIVE-CLiQ ring — a prerequisite for multi-axis interpolation in CNC and robotics applications.

Thermal Management: The internal fan draws ambient air through the bottom vent and exhausts it from the top, maintaining a defined airflow path that keeps the IGBT junction temperature below 125 °C at rated continuous current. An NTC thermistor mounted on the heatsink feeds a hardware over-temperature comparator; if the heatsink exceeds 80 °C, the module autonomously reduces switching frequency to lower switching losses before issuing a warning to the Control Unit. This graduated thermal response prevents abrupt shutdowns during sustained high-load cycles.

DC Bus Capacitor Bank: The intermediate circuit capacitors in the 6SL3120-1TE31-3AA3 are sized to absorb the energy released during a controlled stop of the connected motor without exceeding the maximum DC bus voltage of 820 V DC. The capacitor bank also provides ride-through capability during brief mains dips — typically 20 ms at full load — allowing the axis to complete a controlled deceleration ramp rather than tripping on undervoltage.

System Integration Benefits

• Isochronous Real-Time Axis Synchronisation: DRIVE-CLiQ communication with a 125 µs cycle time enables hardware-level synchronisation between multiple motor modules on the same Control Unit, supporting multi-axis interpolation with sub-millisecond jitter — a requirement for coordinated gantry and cam-profile applications.
• Automatic Motor Data Identification (AMDI): On first commissioning, the module executes a motor identification routine that measures stator resistance, leakage inductance, and magnetising inductance at standstill. This eliminates manual parameter entry and reduces commissioning time from hours to minutes on unfamiliar motor types.
• Integrated Safe Torque Off (STO) — SIL 2 / PLd: The module’s STO function disconnects gate pulses to the IGBT bridge without removing DC bus power, achieving a safe state in under 10 ms. This allows safety-rated axis inhibit without the mechanical wear and response-time penalties of a contactor-based solution.
• Shared DC Bus Energy Recovery: Regenerative braking energy from decelerating axes is fed back onto the common DC bus and consumed by simultaneously accelerating axes, reducing net energy drawn from the line module by up to 30 % in multi-axis systems with overlapping motion profiles.
• Transparent Fault Diagnostics via STARTER / TIA Portal: The module reports over 200 distinct fault and alarm codes with timestamps, axis-specific context, and recommended corrective actions. Fault history is stored in non-volatile memory and survives power cycling, enabling post-mortem analysis without an oscilloscope.
• Scalable Current Rating within Booksize Family: The 6SL3120-1TE31-3AA3 shares mechanical dimensions and bus-bar connectors with other booksize motor modules from 1.7 A to 200 A. Upgrading axis power requires only a module swap and parameter re-identification — no cabinet re-wiring.
• Encoder-Agnostic Feedback via SMx Sensor Modules: The module supports absolute encoders (EnDat 2.1/2.2, SSI), incremental encoders (TTL, HTL), and resolver feedback through external Sensor Modules connected on the DRIVE-CLiQ chain, providing flexibility across motor generations and third-party motor integration.
• Deterministic Current Control Loop: The current controller executes at a 62.5 µs sampling interval (16 kHz switching), achieving a current control bandwidth exceeding 1 kHz. This bandwidth is sufficient to suppress torque disturbances caused by cogging, load variations, and mechanical resonances up to 500 Hz without requiring notch filters in most applications.

Quality Assurance & Global Logistics

Every Siemens 6SL3120-1TE31-3AA3 unit dispatched from our Xiamen, China facility is sourced through verified supply channels and subjected to a structured pre-shipment inspection protocol. Physical inspection covers label authenticity, holographic seal integrity, connector pin condition, and housing dimensional conformance against Siemens factory specifications. Units exhibiting any sign of repackaging, counterfeit labelling, or mechanical damage are quarantined and excluded from sale.

Packaging follows IEC 60068-2-27 shock-protection guidelines: each module is wrapped in anti-static polyethylene foam, enclosed in a rigid corrugated carton rated for 200 kg/m² stacking load, and secured with moisture-absorbing desiccant sachets. For air freight, cartons are additionally sealed with humidity-indicator cards to confirm that the internal environment remained below 60 % RH throughout transit.

Logistics partners include DHL Express, FedEx International Priority, and UPS Worldwide Expedited. Standard transit times from Xiamen to major industrial hubs: Germany 3–4 business days, USA 4–5 business days, Southeast Asia 2–3 business days. Full AWB tracking is provided at time of dispatch. Export documentation — commercial invoice, packing list, certificate of origin, and HS code declaration (8537.10 / 8504.40 as applicable) — is prepared as standard for all international shipments. EUR.1 and Form A certificates are available upon request for preferential tariff applications.

All units are covered by a 12-month warranty from the date of dispatch, covering manufacturing defects and functional failure under normal operating conditions. Warranty claims are processed within 5 business days of receipt of the returned unit at our Xiamen facility.

Contact Information

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