Siemens 6SL3120-2TE21-0AD0 SINAMICS S120 Double Motor Module

The Siemens 6SL3120-2TE21-0AD0 is a double motor module from the SINAMICS S120 modular drive platform. This booksize form factor module provides two independent motor outputs from a single DC link connection, making it an efficient solution for multi-axis motion control applications. Engineered for high-performance servo and vector control, the module delivers precise speed, torque, and position regulation for demanding industrial machinery including machine tools, packaging equipment, printing presses, and handling systems.

Electrical Specifications

The 6SL3120-2TE21-0AD0 operates from a DC link voltage of 510 to 720 V DC and produces a three-phase output voltage of 400 V AC. Each of the two motor outputs is rated for a maximum current of 9 A, with a base current of 12 A and peak current capability of 27 A per axis. The rated output power is 4.1 kW per axis under base conditions, reaching 4.8 kW under rated conditions. The module operates with a pulse frequency of 4 kHz and supports output frequencies up to 650 Hz, specifically tailored for servo control tasks requiring fast dynamic response. DC link capacitance is 220 µF. The power loss is rated between 0.15 kW and 0.19 kW typical.

Mechanical and Environmental Data

This motor module is designed for internal air cooling and carries an IP20 degree of protection, suitable for installation in controlled electrical enclosures. Dimensions are 380 mm in height, 270 mm in width, and 50 mm in depth, with a weight of approximately 4.7 kg. The module is classified as a booksize D-type unit, designed for side-by-side mounting on a common DC link busbar. Operating temperature range is 0°C to 40°C, with a maximum installation altitude of 1000 m above sea level without derating. For installations at higher altitudes, derating factors apply and should be referenced from the SINAMICS S120 engineering manual.

Motor Cable and Wiring

The module supports motor cable lengths up to 50 m when using shielded cable and up to 75 m when using unshielded cable, providing flexibility for machine layout and cabinet placement. Shielded cables are recommended for EMC-sensitive environments to reduce radiated emissions and improve immunity to electrical noise. The drive uses Drive-CLiQ (Siemens' proprietary digital interface) for communication with the control unit and other system components, including integrated safety functions and encoder evaluation. A Drive-CLiQ cable is included with the module for simplified commissioning and diagnostics.

Integrated Safety Functions

The 6SL3120-2TE21-0AD0 incorporates extended integrated safety functions as part of the SINAMICS S120 Safety Integrated package. These functions include Safe Torque Off (STO), Safe Stop 1 (SS1), and optionally Safe Brake Control (SBC) depending on the control unit configuration. The module is certified to SIL 2 per IEC 61508 and PL d per EN ISO 13849-1, allowing it to be used in safety-related applications up to Category 3. Safety functions are activated via the Drive-CLiQ interface or through dedicated digital inputs, depending on the specific system configuration and control unit type.

Compatibility and System Integration

This double motor module is part of the SINAMICS S120 modular system and must be used with a compatible Control Unit (such as CU310-2 or CU320-2) and a Line Module for the DC link supply. Typical configurations include a Smart Line Module or Active Line Module for the front end, feeding one or more double motor modules via a common DC busbar. The 6SL3120-2TE21-0AD0 occupies one slot in the booksize modular rack and is compatible with both single-axis and multi-axis applications. The module supports both servo and induction motors, with automatic motor identification and parameterization via the Drive-CLiQ interface when used with Siemens 1FK7, 1FT7, 1PH8, or 1LA8 motors equipped with electronic rating plates.

Commissioning and Diagnostics

Commissioning is performed using STARTER or SINAMICS Startdrive software integrated into Siemens TIA Portal. The software provides guided startup procedures, auto-tuning of current and speed controllers, oscilloscope functions for signal analysis, and comprehensive diagnostic displays. The module stores fault history and diagnostic data in non-volatile memory, accessible via the Drive-CLiQ interface for remote troubleshooting. LEDs on the front panel indicate operational status, communication health, and fault conditions, with color-coded displays for rapid on-site diagnostics.

Applications

The double motor module is ideal for multi-axis machines where two axes must be controlled from a single module, such as gantry systems, dual-conveyor drives, synchronized feed axes, and coordinated motion applications in packaging, printing, textile, and woodworking machinery. The compact booksize format minimizes panel space while the shared DC link reduces component count and cabling compared to using two single-axis modules. With its high power density and integrated safety, the 6SL3120-2TE21-0AD0 represents a mature solution for modern automated production systems.