Siemens 6SL3120-1TE28-5AA3 Single Motor Module – SINAMICS S120

Siemens 6SL3120-1TE28-5AA3 — Booksize Single Motor Module in the SINAMICS S120 Modular Drive Architecture

The Siemens 6SL3120-1TE28-5AA3 is a booksize-format Single Motor Module within the SINAMICS S120 drive family, rated at 85 A continuous output current and 170 A peak (3 s). It operates from a shared DC-link bus at 600 V DC and interfaces with the system control unit exclusively via the DRIVE-CLiQ serial communication protocol. This module is engineered for closed-loop vector control of synchronous and induction servo motors in applications where torque bandwidth, thermal stability, and deterministic bus timing are non-negotiable design constraints.

Within a SINAMICS S120 multi-axis cabinet, the 6SL3120-1TE28-5AA3 occupies a single booksize slot and draws its DC power from a shared Line Module — either an Active Line Module (ALM) or Smart Line Module (SLM). The shared DC bus topology allows regenerative energy from decelerating axes to be consumed by accelerating axes in real time, reducing net energy draw from the supply and eliminating the need for individual braking resistors in most duty cycles.

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Technical Parameters

Hardware Logical Analysis

IGBT Power Stage and Gate Drive Architecture: The 6SL3120-1TE28-5AA3 employs a three-phase IGBT inverter bridge with a 600 V DC-link rating. The gate drive circuits use isolated bootstrap supplies per phase leg, ensuring that high-side IGBT gate signals remain referenced to the floating emitter potential during switching transitions. This design eliminates common-mode gate voltage stress that would otherwise degrade oxide layers under sustained high-frequency switching at 4–8 kHz.

EMC Design and Conducted Emission Suppression: The module’s internal layout separates the power stage PCB from the control electronics using a grounded copper shield plane. DC-link busbars are routed symmetrically to minimize loop inductance and reduce differential-mode conducted emissions. The DRIVE-CLiQ interface uses differential signaling at 100 Mbit/s with transformer-coupled isolation, providing galvanic separation between the control unit and the power stage — a critical requirement in environments with high common-mode noise from adjacent variable-frequency drives or welding equipment.

Thermal Management and Derating Logic: The integrated forced-air fan operates at a fixed speed determined by firmware, not by a thermistor-controlled variable-speed circuit. Thermal protection relies on an NTC sensor mounted on the IGBT heatsink. When junction temperature approaches the 80 °C threshold, the firmware reduces the pulse frequency from 4 kHz to 2 kHz in a single step, increasing the thermal time constant of the switching losses. If the temperature continues to rise, the module triggers an F30024 fault and initiates a controlled coast-stop sequence rather than an abrupt hardware shutdown — preserving mechanical load integrity.

DC Bus Capacitor Bank and Ride-Through Capability: The booksize module contains a local DC-link capacitor bank sized to provide approximately 2–4 ms of ride-through during brief supply interruptions. This is not intended as a UPS function but rather to absorb the energy spike generated when the Line Module’s pre-charge relay opens during a fault. The capacitor bank also acts as a local energy reservoir during the 170 A peak demand window, reducing the instantaneous current demand on the shared DC bus and preventing voltage sag that could affect adjacent motor modules.

DRIVE-CLiQ Topology and Automatic Parameterization: Each DRIVE-CLiQ-capable component — including the motor encoder, the motor module itself, and any connected sensor modules — stores its own electronic nameplate in non-volatile memory. When the control unit (CU320-2 or CU310-2) performs a topology scan at power-up, it reads these nameplates and automatically populates the drive object parameter set. This eliminates manual entry of motor data (rated current, pole pairs, encoder resolution) and reduces commissioning errors in multi-axis systems where parameter mismatches are a common source of F07900-series faults.

System Integration Benefits

• Shared DC Bus Energy Recovery: Regenerative braking energy from one axis is directly consumed by an accelerating axis on the same DC bus without conversion losses through the supply transformer, reducing net energy consumption in multi-axis systems by 15–30% in typical duty cycles.
• Deterministic DRIVE-CLiQ Cycle Time: The DRIVE-CLiQ bus operates on a fixed isochronous cycle of 125 µs (or 250 µs in extended configurations), ensuring that current setpoint updates from the control unit arrive at the power stage with bounded latency — a prerequisite for closed-loop current control bandwidths above 1 kHz.
• Integrated STO Without External Safety Relay: The Safe Torque Off function is implemented in hardware within the module, removing the need for an external safety relay in the motor power circuit. This reduces cabinet wiring complexity and eliminates the contact wear and response-time variability associated with electromechanical safety relays.
• Scalable Multi-Axis Cabinet Design: Booksize modules mount side-by-side on a common DIN rail with shared DC bus connectors, allowing cabinet designers to add or remove axes without rewiring the DC distribution. A single 16 kW Smart Line Module can supply up to four 6SL3120-1TE28-5AA3 modules in a balanced duty cycle.
• Automatic Firmware Consistency Check: At startup, the CU320-2 verifies that all connected motor modules run compatible firmware versions. Mismatched firmware triggers an A01007 alarm before the drive enables, preventing runtime faults caused by protocol version incompatibilities — a common issue in systems assembled from mixed-vintage spare parts.
• Diagnostic Transparency via STARTER / TIA Portal: The module exposes over 200 diagnostic parameters accessible via STARTER or TIA Portal V16+, including real-time IGBT junction temperature estimates, DC-link voltage ripple measurements, and per-phase current imbalance indicators. This level of observability allows predictive maintenance scheduling without physical inspection of the cabinet.
• Motor Encoder Feedback Integration: The module accepts encoder signals routed through a Sensor Module Cabinet-Mounted (SMC) or directly via DRIVE-CLiQ from motors with integrated encoders. Supported encoder types include TTL incremental, HTL incremental, EnDat 2.1/2.2, SSI absolute, and resolver — covering the full range of Siemens 1FK7, 1FT7, and 1PH8 motor families.
• Reduced Cabinet Footprint vs. Chassis Format: At 60 mm width, the booksize form factor delivers 85 A output in approximately 40% less panel width than an equivalent chassis-format module, enabling higher axis density in space-constrained machine tool cabinets where every millimeter of DIN rail space has a cost.

Quality Assurance & Global Logistics

Every Siemens 6SL3120-1TE28-5AA3 unit dispatched from our Xiamen, China facility is sourced through verified supply channels and subjected to a structured pre-shipment inspection protocol:

• Label and Serial Number Verification: The Siemens product label, including the 2D matrix code, is cross-referenced against the order number and date code to confirm authenticity and production batch traceability.
• Physical Integrity Inspection: All connector housings, DRIVE-CLiQ ports, DC bus connectors, and fan assemblies are inspected for mechanical damage, pin deformation, and contamination before packaging.
• Firmware Version Documentation: Where accessible, the installed firmware version is recorded and provided with the shipment documentation for the customer’s commissioning records.
• ESD-Safe Packaging: Units are packed in anti-static polyethylene bags, placed in custom-cut EPE foam inserts, and shipped in double-wall corrugated cartons rated for international air and sea freight handling.
• Export Documentation: Commercial invoice, packing list, and certificate of origin are prepared for each shipment. HS Code 8537.10 is applied for customs classification. DDP (Delivered Duty Paid) terms are available for select destinations upon request.
• Logistics Partners: Standard shipments are dispatched via DHL Express, FedEx International Priority, or UPS Worldwide Expedited from Xiamen Gaoqi International Airport (XMN), with typical transit times of 3–5 business days to Europe and North America, and 1–3 business days to Southeast Asia.
• Warranty Coverage: A 12-month warranty from the date of shipment covers manufacturing defects and functional failures under normal operating conditions as defined in Siemens SINAMICS S120 operating instructions (document 6SL3097-4AA00-0BP5).

Contact Information

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