Siemens 6SL3246-0BA22-1FA0 Power Module – SINAMICS S120

Siemens 6SL3246-0BA22-1FA0: 24 V DC Control Supply Architecture Within the SINAMICS S120 Booksize Drive Line-Up

In a multi-axis SINAMICS S120 booksize installation, the control electronics — the Control Unit, encoder evaluation boards, and DRIVE-CLiQ topology — operate on a 24 V DC rail that is entirely separate from the DC link bus powering the Motor Modules. This architectural separation is deliberate: it allows the control layer to remain energized and responsive during DC bus pre-charge sequences, during regenerative braking transients, and during controlled shutdown procedures where the main power stage is already de-energized. The Siemens 6SL3246-0BA22-1FA0 is the dedicated hardware that generates and stabilizes this 24 V DC control supply directly from the three-phase AC line, eliminating the need for an external 24 V SMPS and the associated wiring complexity.

The module occupies a standard booksize slot in the S120 drive line-up and connects to the shared DC bus bar and signal bus. Its DRIVE-CLiQ port registers the module in the drive topology automatically upon power-up, enabling the Control Unit to monitor supply status, output voltage, and fault conditions in real time without additional parameterization. In high-axis-count machine tool and packaging line architectures — where a single CU320-2 may coordinate 12 or more Motor Modules — the reliability of this control supply directly determines the mean time between unplanned stops for the entire drive group.

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Technical Parameters

Hardware Logical Analysis

The 6SL3246-0BA22-1FA0 implements a switch-mode power conversion topology operating from the three-phase AC input. The rectifier stage produces an intermediate DC voltage, which feeds a high-frequency DC-DC converter stage that steps down and regulates the output to 24 V DC. This two-stage architecture provides galvanic isolation between the AC input and the 24 V DC output rail — a critical design requirement in drive cabinets where the DC bus can reach 650–750 V DC under normal operating conditions.

EMC Design: The module incorporates an integrated line filter on the AC input side, suppressing conducted emissions in the frequency range defined by EN 61000-6-4 (industrial environments). Common-mode chokes and X/Y capacitors attenuate both differential-mode and common-mode noise generated by the switching converter, preventing interference from propagating back onto the supply network or coupling into adjacent signal wiring. The booksize housing provides a continuous shielded enclosure, and the module’s grounding connection to the drive line-up chassis ensures a low-impedance return path for high-frequency currents.

Output Regulation and Hold-Up: The regulated 24 V DC output maintains voltage within ±1% under steady-state load variations from 0 to 100% of rated current. The internal energy storage capacitors provide a hold-up time sufficient to ride through brief AC supply interruptions — typically 20 ms at full load — allowing the Control Unit to execute a controlled fault response rather than experiencing an immediate logic reset. This characteristic is particularly relevant in applications where a sudden control supply dropout would cause loss of encoder position data and require a full machine re-homing cycle.

DRIVE-CLiQ Integration Logic: Upon power-up, the module’s embedded microcontroller broadcasts its electronic nameplate data — including firmware version, hardware revision, and rated parameters — over the DRIVE-CLiQ serial bus. The Control Unit reads this data during topology identification and maps the module into the drive object hierarchy. Fault conditions (over-temperature, output over-voltage, output under-voltage) are reported as DRIVE-CLiQ fault messages with specific fault codes, enabling the Control Unit to log events with timestamps and trigger appropriate protective responses without requiring additional discrete wiring.

Thermal Management: The integrated fan operates at a fixed speed and forces air through the module’s internal heat sink. The thermal protection circuit monitors the heat sink temperature via an NTC sensor; if the temperature exceeds the shutdown threshold, the module generates a fault signal on DRIVE-CLiQ before initiating a controlled output shutdown, giving the Control Unit time to bring the drive system to a safe state rather than experiencing an abrupt power loss.

System Integration Benefits

• Eliminates External 24 V SMPS: Deriving the control supply directly from the AC line removes the need for a separate 24 V switched-mode power supply, reducing cabinet component count, wiring terminations, and potential single-point failure nodes in the control power distribution circuit.
• Deterministic Control Layer Availability: Because the 24 V rail is sourced independently of the DC bus, the Control Unit remains operational during DC bus pre-charge, during regenerative energy recovery cycles, and during controlled stop sequences — preserving encoder position data and active safety function states throughout the power cycle.
• Automatic Topology Registration: DRIVE-CLiQ plug-and-play registration means the module appears in the STARTER or TIA Portal drive topology view without manual parameterization, reducing commissioning time in multi-axis installations where manual configuration of each component would otherwise be time-consuming.
• Centralized Fault Diagnostics: All supply faults — over-temperature, output deviation, fan failure — are reported as structured DRIVE-CLiQ fault codes with timestamps, enabling maintenance engineers to correlate supply events with drive faults in the diagnostic buffer without installing additional monitoring hardware.
• Scalable Architecture Compatibility: The module is dimensioned to supply the 24 V current demand of a CU320-2 Control Unit together with its associated DRIVE-CLiQ peripherals (SMC modules, TM modules), supporting drive configurations from 2-axis to 12-axis without requiring a higher-rated external supply.
• Reduced Cabinet Footprint: The booksize form factor integrates directly into the S120 drive line-up on the shared mounting rail, occupying no additional panel space compared to a standalone external power supply with its own DIN rail section and terminal blocks.
• Galvanic Isolation: The isolation barrier between the AC input and the 24 V DC output protects the Control Unit and connected signal interfaces from transient overvoltages originating on the AC supply network, reducing the risk of logic board damage during switching events or utility grid disturbances.
• Hold-Up During Micro-Interruptions: The internal energy storage provides approximately 20 ms of output hold-up at full load, allowing the Control Unit to execute a fault-response routine and log diagnostic data before the 24 V rail collapses — a capability that prevents data loss and reduces re-commissioning time after supply disturbances.
• Firmware Transparency: The electronic nameplate transmitted over DRIVE-CLiQ includes the module’s firmware version, enabling the Control Unit to flag firmware mismatches during topology identification and prompting the engineer to update before the mismatch causes operational incompatibilities.
• Standardized Spare Part Management: A single 6SL3246-0BA22-1FA0 unit covers the control supply requirement for the entire S120 booksize drive group, simplifying spare parts inventory management compared to maintaining multiple external SMPS units of varying ratings.

Quality Assurance & Global Logistics

Every 6SL3246-0BA22-1FA0 unit supplied by siemensplc.com is sourced through verified supply channels and subjected to a structured pre-dispatch inspection protocol. Physical inspection covers housing integrity, label authenticity, connector condition, and DRIVE-CLiQ port alignment. Where test equipment is available, output voltage and fan operation are verified under bench conditions prior to packaging.

Units are packed in anti-static bags within foam-lined cartons dimensioned to the module’s booksize form factor, providing mechanical protection against shock and vibration during international freight. Export documentation — commercial invoice, packing list, and certificate of origin — is prepared as standard for all international shipments.

Dispatch is from Xiamen, China, with access to DHL Express, FedEx International Priority, UPS Worldwide Express, and consolidated sea freight options for volume orders. Transit times to major industrial hubs: Europe 3–5 business days (air), Southeast Asia 2–3 business days (air), Middle East 4–6 business days (air), Americas 5–7 business days (air). All shipments include tracking numbers provided at time of dispatch. For time-critical plant maintenance requirements, same-day dispatch is available for in-stock units when orders are confirmed before 14:00 CST.

A 12-month warranty from the date of dispatch covers manufacturing defects and functional failures under normal operating conditions as defined in the Siemens SINAMICS S120 product documentation. Warranty claims are processed with full documentation support.

Contact Information

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