SIEMENS 6SL3120-2TE21-8AC0 – Double Motor Module | SINAMICS S120 Booksize
Engineering Background
The SINAMICS S120 drive system is Siemens’ flagship multi-axis servo and vector drive platform, engineered for high-dynamic motion control in demanding industrial environments. The Booksize format offers a compact, modular architecture where Motor Modules share a common DC bus supplied by a Line Module, enabling synchronized multi-axis coordination with minimal cabinet footprint.
Product Positioning
The 6SL3120-2TE21-8AC0 is a Double Motor Module in the SINAMICS S120 Booksize series, rated at 2 × 9A (18A total) output current. It is designed to independently drive two servo or induction motors from a single module slot, making it the preferred choice for twin-axis gantry systems, dual-spindle machines, and coordinated conveyor drives where space and cost efficiency are critical.
Complete Technical Specifications
| Part Number | 6SL3120-2TE21-8AC0 |
| Series / Platform | SINAMICS S120 Booksize |
| Module Type | Double Motor Module (2-axis) |
| Output Current (per axis) | 9 A |
| Total Output Current | 18 A |
| DC Bus Voltage | 600 V DC (nominal) |
| Output Voltage | 0 – 480 V AC (3-phase) |
| Switching Frequency | 4 / 8 / 16 kHz (configurable) |
| Control Interface | DRIVE-CLiQ (high-speed digital) |
| Encoder Interface | Via DRIVE-CLiQ SMC or SME modules |
| Protection Class | IP20 |
| Cooling Method | Forced air (internal fan) |
| Ambient Temperature | 0 °C to +40 °C (derated to +55 °C) |
| Storage Temperature | -40 °C to +70 °C |
| Humidity | ≤ 95% RH, non-condensing |
| Altitude | Up to 1000 m (derated above) |
| Dimensions (W × H × D) | 50 mm × 380 mm × 270 mm (approx.) |
| Weight | ~10.58 kg |
| Compliance | CE, UL, cUL, RoHS |
| Firmware Compatibility | SINAMICS S120 FW ≥ 4.x |
| Configuration Tool | STARTER / SINAMICS Startdrive (TIA Portal) |
Proven Application Environments
- CNC Machining Centers – Dual-axis feed drives for X/Y or Y/Z coordinated motion
- Gantry & Portal Systems – Synchronized twin-motor gantry control with electronic gearing
- Packaging Machinery – High-speed dual-axis pick-and-place and sealing units
- Printing & Converting – Tension-controlled dual-web drive systems
- Textile & Winding Machines – Coordinated spindle and traverse drives
- Robotics & Handling – Multi-joint servo coordination in Cartesian robots
- Conveyor Systems – Dual-zone speed-synchronized belt drives
Engineering Advantages
- Space Efficiency – Two independent motor axes in a single 50 mm Booksize slot, halving cabinet width vs. two Single Motor Modules
- DRIVE-CLiQ Integration – Plug-and-play digital communication with CU320-2 / CU310-2 Control Units; automatic parameter identification (SIZER)
- Shared DC Bus Architecture – Energy regeneration between axes reduces net power consumption and eliminates braking resistors in balanced load profiles
- Flexible Switching Frequency – 4 / 8 / 16 kHz selection optimizes between motor heating, acoustic noise, and dynamic response
- Safe Torque Off (STO) – Integrated SIL 2 / PLd safety function per IEC 62061 / ISO 13849-1, no external safety relay required
- Diagnostic Transparency – Real-time fault codes, current waveforms, and thermal status accessible via STARTER or TIA Portal Startdrive
System Architecture & Signal Flow
In a standard SINAMICS S120 Booksize cabinet, the 6SL3120-2TE21-8AC0 occupies the following position in the signal and power chain:
- AC Supply → Line Filter (6SL31xx) → Active/Smart Line Module (ALM/SLM)
- DC Bus Rail → 6SL3120-2TE21-8AC0 Double Motor Module (DC input)
- Motor Output Terminals U2/V2/W2 (Axis 1) & U3/V3/W3 (Axis 2) → Servo / Induction Motors
- DRIVE-CLiQ Daisy Chain: CU320-2 DP/PN → Line Module → Motor Module (X200/X201 ports)
- Encoder Feedback: Motor encoder → SMC30/SME20 → DRIVE-CLiQ → CU320-2
- Safety Channel: STO terminals (EP+/EP-) wired to safety PLC or F-DI on CU320-2
Sourcing & Quality Verification
- Origin: Sourced from authorized Siemens distribution channels and verified OEM surplus
- Inspection Protocol: Each unit undergoes visual inspection, label authenticity check, firmware version verification, and functional power-on test before dispatch
- Traceability: Serial number and date code recorded; full chain-of-custody documentation available on request
- Packaging: Anti-static ESD bag + foam-lined export carton; shock indicators included for international freight
- Warranty: 12-month operational warranty against manufacturing defects
Procurement Process
- Inquiry – Submit part number, required quantity, and delivery timeline via email or WhatsApp
- Quotation – Receive itemized quote with unit price, lead time, and shipping options within 24 hours
- Order Confirmation – Pro-forma invoice issued; payment via T/T, PayPal, or trade credit (approved accounts)
- Quality Check & Dispatch – Pre-shipment inspection report provided; tracking number issued within 2 business days
- Delivery – DHL / FedEx Express (3–7 days) or sea freight for bulk orders; customs documentation included
- After-Sales – Technical support available post-installation; RMA process initiated within 48 hours if defect confirmed
Technical FAQ
Q: Can the 6SL3120-2TE21-8AC0 operate the two axes independently at different speeds?
A: Yes. Each axis has its own independent inverter bridge and DRIVE-CLiQ channel. Speed, torque, and position setpoints are issued independently by the CU320-2 Control Unit.
Q: What Line Module is required to power this Double Motor Module?
A: A Smart Line Module (SLM) or Active Line Module (ALM) rated ≥ 16 kW is recommended for full dual-axis loading. Common pairings include 6SL3130-6TE21-6AA3 (SLM 16 kW) or 6SL3130-7TE21-6AA3 (ALM 16 kW).
Q: Is STO (Safe Torque Off) certified for use without an external safety relay?
A: Yes. The integrated STO function is certified to SIL 2 (IEC 62061) and PLd Cat. 3 (ISO 13849-1), allowing direct wiring to an F-DI on a SIMATIC F-CPU or safety relay module.
Q: What is the difference between 6SL3120-2TE21-8AC0 and 6SL3120-1TE21-8AA1?
A: The 2TE variant is a Double Motor Module (2 axes × 9A); the 1TE variant is a Single Motor Module (1 axis × 18A). Choose 2TE for twin-axis applications, 1TE for single high-current axis.
Q: Can this module be used with third-party motors (non-Siemens)?
A: Yes, with manual encoder configuration. DRIVE-CLiQ auto-identification requires Siemens motors with DRIVE-CLiQ interface. Third-party motors require manual parameterization via STARTER/Startdrive and an appropriate SMC encoder module.
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