Siemens 6SL3351-6GH34-1AB3 – High-Power Booksize Drive Module | SINAMICS S120 Platform
Engineering Background
The SINAMICS S120 platform is Siemens’ flagship multi-axis servo and vector drive system, engineered for demanding motion-control applications in machine tools, printing presses, packaging lines, and heavy industrial automation. The S120 Booksize format delivers high power density in a compact DIN-rail-mountable form factor, sharing a common DC bus architecture that enables regenerative energy exchange between axes—reducing energy consumption and heat dissipation across the entire drive train.
Product Positioning
The 6SL3351-6GH34-1AB3 is a high-current Booksize Drive Module within the SINAMICS S120 family, rated for 380–480 V AC input and delivering a continuous output current of 410 A. It is designed to operate as a Motor Module (inverter stage) in conjunction with an Active Line Module (ALM) or Basic Line Module (BLM), making it the power-stage backbone for high-torque servo and induction motor drives in multi-axis CNC and process automation systems.
Complete Technical Specifications
| Part Number / SKU | 6SL3351-6GH34-1AB3 |
| Brand | Siemens |
| Product Family | SINAMICS S120 |
| Form Factor | Booksize |
| Module Type | Motor Module (Drive Module / Inverter) |
| Input Voltage | 380 – 480 V AC (3-phase, ±10%) |
| DC Bus Voltage | 510 – 720 V DC |
| Continuous Output Current | 410 A |
| Peak Output Current | 820 A (3 s overload) |
| Output Power (nominal) | ~200 kW @ 400 V |
| Switching Frequency | 2 / 4 / 8 kHz (configurable) |
| Control Interface | DRIVE-CLiQ |
| Cooling Method | Forced air (internal fan) |
| Protection Rating | IP20 |
| Ambient Temperature | 0 °C to +40 °C (derating above 40 °C) |
| Storage Temperature | -40 °C to +70 °C |
| Humidity | ≤ 95% RH, non-condensing |
| Approvals / Standards | CE, UL, cUL, RoHS |
| Weight | ~5.8 kg |
| Country of Origin | Germany |
| Siemens MLFB | 6SL3351-6GH34-1AB3 |
Proven Application Environments
- CNC Machine Tools – Multi-axis spindle and feed-axis drives requiring precise torque and speed control at high current ratings.
- Printing & Packaging Machinery – Synchronised multi-motor systems leveraging the shared DC bus for energy recovery.
- Plastics & Rubber Processing – Extruder and injection-moulding drives demanding high continuous torque with overload capability.
- Steel & Rolling Mills – High-inertia load applications where peak current headroom (820 A) is critical for acceleration.
- Crane & Hoist Systems – Regenerative braking energy fed back to the DC bus, reducing resistor braking losses.
- Test Bench & Dynamometer Systems – Four-quadrant operation enabling both motoring and regenerative loading.
Engineering Advantages
- Shared DC Bus Architecture – Enables kinetic energy from decelerating axes to power accelerating axes, cutting overall energy consumption by up to 30%.
- DRIVE-CLiQ Communication – Single-cable digital interface to CU320-2 Control Units and SIMOTICS motors eliminates analogue wiring errors and enables automatic parameter upload.
- 2× Overload Capability – 820 A peak for 3 seconds supports aggressive acceleration profiles without oversizing the module.
- Configurable Switching Frequency – 2/4/8 kHz selection balances motor acoustic noise against switching losses for the specific application.
- Integrated Safety Functions – STO (Safe Torque Off) and SS1 (Safe Stop 1) certified to SIL 2 / PLd, reducing external safety relay hardware.
- Compact Booksize Form Factor – Side-by-side mounting with other S120 Booksize modules minimises cabinet footprint.
System Architecture & Signal Flow
In a typical SINAMICS S120 Booksize cabinet:
- Active Line Module (ALM) – Rectifies 3-phase AC mains to a regulated DC bus; provides regenerative feed-back capability.
- DC Bus Connector / Busbars – Distributes DC voltage to all Motor Modules in the cabinet.
- 6SL3351-6GH34-1AB3 Motor Module – Inverts DC bus voltage to variable-frequency 3-phase AC output for the connected motor.
- DRIVE-CLiQ Daisy Chain – CU320-2 Control Unit communicates with the Motor Module and motor encoder via DRIVE-CLiQ for closed-loop vector or servo control.
- SIMOTICS / Third-Party Motor – Receives PWM output; encoder feedback closes the speed/torque loop.
Sourcing & Quality Verification
- OEM-Traceable Stock – Units sourced through authorised Siemens distribution channels with full traceability documentation available on request.
- Pre-Shipment Inspection – Each module undergoes visual inspection, label verification (MLFB, date code, serial number), and functional power-on test before dispatch.
- Authentic Packaging – Shipped in original Siemens anti-static packaging with factory seal intact where applicable.
- Warranty – 12-month warranty against manufacturing defects; DOA replacement within 7 business days.
- Counterfeit Prevention – All units verified against Siemens MLFB decoder and cross-referenced with factory serial number databases.
Procurement Process
- Submit RFQ – Email [email protected] or call +0086 19859288691 with your required quantity and delivery timeline.
- Quotation & Lead Time – Receive a formal quotation within 24 business hours including unit price, freight, and estimated delivery.
- Order Confirmation – Issue a Purchase Order; proforma invoice issued for payment processing.
- Quality Inspection & Dispatch – Module inspected, photographed, and dispatched via DHL / FedEx with tracking number provided.
- After-Sales Support – Technical commissioning support available via email or video call with our automation engineers.
Technical FAQ
Q: Can the 6SL3351-6GH34-1AB3 operate as a standalone drive without an ALM?
A: No. As a Motor Module (inverter stage only), it requires a Line Module (ALM or BLM) to supply the DC bus. It cannot be connected directly to AC mains.
Q: Which Control Unit is compatible?
A: The CU320-2 DP (PROFIBUS) and CU320-2 PN (PROFINET) are the primary compatible Control Units. The module is also compatible with CU310-2 in single-axis configurations.
Q: Is firmware upgrade required upon installation?
A: Siemens recommends matching firmware versions across all S120 components. Use STARTER or TIA Portal V17+ to verify and update firmware via DRIVE-CLiQ.
Q: What motor types are supported?
A: Synchronous servo motors (1FK7, 1FT7), asynchronous induction motors (1LA, 1LE), and third-party motors with compatible encoder interfaces (HTL, TTL, EnDat 2.1/2.2, SSI, Resolver).
Q: Can I use this module for a single-axis application?
A: Yes. While the S120 platform is optimised for multi-axis systems, a single Motor Module can be used with one ALM for single-axis high-power applications.
Q: What is the minimum order quantity?
A: MOQ is 1 unit. Volume pricing is available for orders of 3 units or more.
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