Siemens 6SL3350-6TK00-0BA0 Active Line Module – SINAMICS S120

Siemens 6SL3350-6TK00-0BA0 — 16 kW Active Line Module in the SINAMICS S120 Booksize DC Bus Architecture

The 6SL3350-6TK00-0BA0 is the Active Line Module (ALM) rated at 16 kW within the Siemens SINAMICS S120 Booksize drive family. Its primary function in a multi-axis drive system is to serve as the bidirectional AC/DC power conversion stage: it rectifies three-phase supply voltage into a regulated DC link and, during motor deceleration, inverts regenerated DC energy back onto the AC grid. This bidirectional energy path eliminates the need for braking resistors in most cyclic-load applications and directly reduces net energy consumption at the point of common coupling.

Unlike passive diode-bridge rectifiers, the 6SL3350-6TK00-0BA0 employs an IGBT-based active front-end (AFE) topology. The switching pattern of the IGBT bridge is modulated by a dedicated DSP-controlled PWM algorithm that forces the input current waveform to track the supply voltage sinusoid. The result is a near-unity displacement power factor (cos φ ≈ 1.0) and a total harmonic distortion of input current (THDi) below 5% under rated load — figures that passive rectifiers cannot approach without large passive filter banks. For facilities operating under IEEE 519-2022 or EN 61000-3-12 harmonic limits, this characteristic alone can determine whether a supplementary harmonic filter is required at the main distribution board.

Within the SINAMICS S120 Booksize line-up, the ALM connects to Motor Modules via a shared DC bus bar assembly. All Motor Modules draw from and return energy to this common DC rail, meaning that when one axis decelerates, its regenerated energy is immediately available to an accelerating axis on the same bus — a cross-axis energy exchange that reduces peak demand from the supply. The 6SL3350-6TK00-0BA0 manages the DC link voltage regulation loop, holding the bus at approximately 600–750 V DC across the full load range, and handles the transition between motoring and regenerating modes without operator intervention.

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Technical Parameters

Hardware Logical Analysis

The AFE rectifier stage of the 6SL3350-6TK00-0BA0 consists of six IGBTs arranged in a three-phase full-bridge configuration, each with an anti-parallel freewheeling diode. The gate drive signals are generated by an onboard DSP executing a space-vector PWM (SVPWM) algorithm at a switching frequency typically in the 4–8 kHz range. The control loop continuously samples the AC line voltage via voltage transducers and the DC link voltage via a resistive divider, then adjusts the modulation index and phase angle of the IGBT switching pattern to maintain DC bus regulation and unity power factor simultaneously.

EMC Design: The Booksize enclosure integrates a common-mode choke on the DC bus output and differential-mode inductance on the AC input side. These passive elements, combined with the AFE’s inherent harmonic cancellation, suppress conducted emissions in the frequency range 150 kHz–30 MHz to levels compliant with EN 55011 Class A without requiring an external EMC filter in most standard industrial installations. For Category C2 environments per EN 61800-3, an upstream line filter (e.g., 6SL3000-0BE21-6AA0) is recommended.

DC Bus Pre-charge Circuit: An internal pre-charge relay and resistor network limit inrush current during power-up. The pre-charge sequence is supervised by the onboard microcontroller: it monitors DC link voltage rise rate and closes the main contactor only when the bus reaches approximately 90% of nominal voltage, preventing capacitor bank stress and supply voltage dips at startup.

DRIVE-CLiQ Interface: The module exposes one DRIVE-CLiQ port that carries both real-time process data (DC link voltage, input current, temperature, status word) and configuration data over a single RJ45 connector at 100 Mbit/s. The Control Unit (e.g., CU320-2 DP/PN) performs automatic topology detection at power-up: it reads the electronic nameplate stored in each module’s EEPROM, verifies firmware compatibility, and assigns drive object IDs without manual parameterization. This mechanism eliminates wiring errors in multi-axis cabinets and accelerates commissioning time.

Thermal Management: An NTC thermistor mounted on the IGBT heatsink feeds temperature data to the control loop. If junction temperature approaches the derating threshold (~80 °C), the firmware reduces the switching frequency and output current limit in a controlled ramp rather than triggering an immediate fault — preserving process continuity in high-ambient installations.

System Integration Benefits

• Shared DC Bus Energy Exchange: Regenerated energy from decelerating axes is immediately consumed by accelerating axes on the same bus, reducing peak AC demand and lowering energy costs in cyclic multi-axis applications.
• Harmonic Compliance Without External Filters: THDi < 5% satisfies IEEE 519-2022 and EN 61000-3-12 in most grid configurations, eliminating the capital cost and panel space of passive harmonic filters.
• Deterministic Real-Time Diagnostics via DRIVE-CLiQ: All electrical and thermal parameters are transmitted to the CU320-2 every 125 µs, enabling the PLC or SCADA system to log fault precursors before a trip occurs.
• Automatic Topology Recognition: EEPROM-based electronic nameplates allow TIA Portal / Startdrive to auto-configure the drive line-up, reducing commissioning errors in multi-axis cabinets with 10+ modules.
• Four-Quadrant Operation: The module handles motoring and regenerating transitions transparently — no external braking chopper or resistor bank is required for most duty cycles, simplifying cabinet design and reducing heat dissipation inside the enclosure.
• Scalable DC Bus Architecture: Additional Motor Modules (e.g., 6SL3120-series) can be added to the shared bus without modifying the ALM, provided total connected motor power remains within the 16 kW infeed rating.
• Safety Integration Compatibility: When paired with S120 Motor Modules carrying Safety Integrated firmware, the system supports STO (Safe Torque Off), SS1 (Safe Stop 1), and SLS (Safely Limited Speed) without external safety relays, reducing SIL 2 / PLd implementation complexity.
• TIA Portal / STARTER Commissioning: Full parameter set accessible via SINAMICS Startdrive (TIA Portal V16+) or STARTER V5.4+. Drive object parameters, fault buffers, and trace recordings are available without additional hardware.

Quality Assurance & Global Logistics

Every 6SL3350-6TK00-0BA0 unit supplied by siemensplc.com is sourced as genuine Siemens AG production hardware, manufactured in Germany under ISO 9001-certified processes. Units are stored in climate-controlled warehousing in Xiamen, China, in original Siemens anti-static packaging with factory labels and intact serial number stickers. Serial numbers and date codes are documented and provided with each shipment for full traceability.

Prior to dispatch, each unit undergoes a visual inspection and, upon request, a functional power-on verification test. Export documentation — including commercial invoice, packing list, certificate of origin, and ECCN classification — is prepared for all international shipments to facilitate customs clearance in the EU, North America, Southeast Asia, and the Middle East.

Shipments from Xiamen are dispatched via DHL Express, FedEx International Priority, or UPS Worldwide Expedited, with typical transit times of 3–5 business days to major industrial hubs globally. Air freight consolidation is available for multi-unit orders. All shipments include full tracking and are covered by cargo insurance. In-stock units are dispatched within 1–2 business days of payment confirmation.

Contact Information

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