SIEMENS 6SL3731-7TE41-0LE0 SINAMICS S120 Cabinet Modules 2 Active Line Module 630kW 985A Left Side Mount 400V

The SIEMENS 6SL3731-7ku71-3le0 SINAMICS S120 Cabinet Module is a robust, high-performance active line module designed for demanding industrial applications. This unit delivers exceptional power density and control precision, boasting a 630kW output and 985A current rating. Engineered for left-side mounting in 400V systems, it provides a reliable and efficient solution for variable speed drive requirements. Its advanced active infeed technology ensures a low-harmonic current and unity power factor, contributing to significant energy savings and grid-friendly operation. The SINAMICS S120 platform is renowned for its flexibility and scalability, making this module a strategic investment for modern industrial automation.

Product Specifications

| Feature | Specification |

|---|---|

| Product Number | 6SL3731-7KU71-3LE0 |

| Product Family | SINAMICS S120 Cabinet Modules |

| Module Type | Active Line Module |

| Power Rating | 630 kW |

| Continuous Output Current | 985 A |

| Nominal Voltage | 400 V |

| Mounting Orientation | Left Side Mount |

| Control Unit Compatibility | Typically S120 Control Units (e.g., CU320-2) |

| Communication Interfaces | PROFIBUS DP, PROFINET IO |

| Protection Rating | IP20 (typical for cabinet modules) |

| Dimensions | Varies based on cabinet configuration |

| Weight | Varies based on cabinet configuration |

Core Features & Market Positioning

The SIEMENS 6SL3731-7ku71-3le0 stands out in the industrial drive market due to its advanced active infeed technology. This feature actively feeds energy back into the supply network during regenerative braking, drastically improving overall system efficiency and reducing operational costs. Unlike passive filters or line reactors, active line modules offer superior harmonic suppression and a power factor close to unity across a wide load range, minimizing penalties from utility providers and reducing stress on electrical infrastructure. This technological advantage positions the SINAMICS S120 module as a premium solution for industries prioritizing energy efficiency, grid compliance, and high-performance motion control. Its integration into the SINAMICS S120 ecosystem ensures seamless compatibility with a wide array of motors and control units, offering a unified and intelligent drive solution.

Key Application Scenarios

This high-power active line module is ideally suited for applications demanding substantial torque and precise speed control, such as heavy-duty conveyor systems in mining and material handling, large extruders in plastics manufacturing, and powerful pumps and fans in process industries. Its ability to handle regenerative energy makes it particularly valuable in cyclic applications like cranes, hoists, and presses, where significant energy can be recovered and reused. Furthermore, industries with strict power quality regulations, such as those in the chemical or pharmaceutical sectors, benefit from the module's inherent low harmonic distortion and unity power factor, ensuring compliance and stable grid operation. The 400V rating and high current capacity are indicative of its suitability for large-scale industrial machinery.

Practical System Integration Guidance

Integrating the SIEMENS 6SL3731-7ku71-3le0 involves careful planning for cabinet layout and electrical connections. It is typically mounted on the left side of a SINAMICS S120 cabinet, requiring adequate ventilation and clearance as per Siemens' installation guidelines. Electrical connection should be performed by qualified personnel, adhering strictly to the voltage and current ratings. The module interfaces with a compatible SINAMICS S120 Control Unit (e.g., CU320-2) via a dedicated bus cable, enabling sophisticated motion control functions. Proper grounding and shielding of all cables are critical for ensuring electromagnetic compatibility (EMC) and reliable communication, especially in harsh industrial environments. Configuration typically involves using Siemens' STARTER commissioning software to set drive parameters, motor data, and control modes tailored to the specific application.

Operation and Risk Mitigation

Safe operation of the SIEMENS 6SL3731-7ku71-3le0 mandates adherence to all safety instructions provided in the product manual. Ensure that the drive is properly insulated and that all protective covers are in place before powering up. Emergency stop functions must be integrated into the system and regularly tested. Common operational risks include overcurrent, overvoltage, and undervoltage faults, which can often be mitigated by correct parameterization, ensuring stable power supply, and verifying motor and load conditions. Diagnostic messages and fault codes displayed on the control unit or through connected HMIs are crucial for troubleshooting. For instance, a fault code related to an infeed error might indicate issues with the mains supply or internal module diagnostics, requiring systematic investigation.

Scalability & Long-Term Value

The SINAMICS S120 platform, including the 6SL3731-7ku71-3le0, offers inherent scalability, allowing for the expansion of drive systems by adding more motor modules or control units as production demands increase. This modularity ensures that investments in drive technology remain relevant and adaptable to future needs. The active line module's design also supports integration with Industry 4.0 initiatives. Through its PROFINET or PROFIBUS communication interfaces, it can be seamlessly connected to higher-level automation systems and cloud platforms for advanced data acquisition, predictive maintenance, and remote diagnostics. This connectivity unlocks opportunities for optimizing operational efficiency and extending the lifecycle value of the installed equipment.

Frequently Asked Questions

What is the primary function of the SIEMENS 6SL3731-7ku71-3le0?

This active line module serves as the power interface for SINAMICS S120 drives.

It efficiently manages power flow and actively feeds energy back to the grid.

Its core role is to provide a stable, high-quality power supply to motor modules.

How does the active line module differ from a passive infeed?

Active line modules offer superior harmonic mitigation and power factor correction.

They actively regenerate energy, unlike passive infeed units that simply condition power.

This active regeneration leads to higher overall system efficiency and grid compliance.

What are the typical voltage and current ratings for this module?

The module is designed for a nominal voltage of 400V.

It can handle a continuous output current of up to 985A.

These specifications make it suitable for high-power industrial machinery.

Can this module be used with any Siemens motor?

It is designed to work with the SINAMICS S120 drive system, compatible with various motor types.

Typically used with synchronous and asynchronous motors for optimal performance.

Always refer to the SINAMICS S120 compatibility list for precise motor selection.

What is the benefit of active line regeneration?

Regeneration recovers energy during braking, reducing overall energy consumption.

It improves the power factor, lowering electricity costs and grid impact.

This feature is especially valuable in applications with frequent deceleration.

What communication protocols does the 6SL3731-7ku71-3le0 support?

This module supports industrial communication standards like PROFINET IO.

It also integrates with PROFIBUS DP for robust data exchange.

These protocols enable seamless integration into automation networks.

What safety precautions are necessary during installation?

Ensure proper isolation from the power supply before any work begins.

Qualified personnel must perform all electrical connections following safety standards.

Always verify that all protective covers are securely in place post-installation.

How can I troubleshoot common faults with this module?

Consult the SINAMICS S120 diagnostic messages for error codes.

Check the mains voltage and quality for potential supply issues.

Verify motor and load conditions if overcurrent or overload faults occur.

Is the SINAMICS S120 system scalable with this module?

Yes, the modular design allows for adding more motor modules and control units.

This provides flexibility to expand drive capacity as needed.

The system can grow with your production requirements.

What is the power factor of an active line module?

Active line modules achieve a power factor close to unity.

This means they draw minimal reactive power from the grid.

A high power factor improves grid stability and reduces energy costs.