SIEMENS 6SL3735-7TE41-0MA3 SINAMICS S120 Active Line Connection Module Compact 630kW 985A without MCB 1200mm Width Liquid Cooled

The SIEMENS 6SL3735-7KL41-0MA0 SINAMICS S120 Active Line Connection Module Compact 630kW 985A, liquid-cooled with a 1200mm width, stands as a pinnacle of power density and operational efficiency for demanding industrial applications. This module boasts advanced active infeed technology, ensuring a clean, sinusoidal current draw from the mains, thereby minimizing harmonic distortion and complying with stringent grid codes. Its integrated design, featuring liquid cooling, enables robust performance and reliability even under extreme thermal loads, making it ideal for heavy-duty machinery. With a substantial 630kW power rating and 985A current capacity, it provides the backbone for high-performance motor control systems.

Product Specifications

| Feature                         | Specification                                     |

| :------------------------------ | :------------------------------------------------ |

| Product Number                  | 6SL3735-7KL41-0MA0                                |

| Product Family                  | SINAMICS S120                                     |

| Module Type                     | Active Line Connection Module Compact             |

| Rated Power                     | 630 kW                                            |

| Rated Current                   | 985 A                                             |

| Cooling Method                  | Liquid Cooled                                     |

| Width                           | 1200 mm                                           |

| Number of Controlled Axes       | Typically integrated within multi-axis systems    |

| Voltage Range                   | Varies based on configuration, typically 400-480V |

| Communication Interfaces        | PROFINET, PROFIBUS, EtherNet/IP (depending on control unit) |

| Protection Class                | IP20 (enclosure)                                  |

| Approvals                       | CE, UL, cUL, EAC                                  |

| Ambient Temperature (Operation) | -20°C to +50°C (derating may apply)                |

Core Features & Market Positioning

The SIEMENS 6SL3735-7KL41-0MA0 differentiates itself through its "Active Line Connection" technology, a significant advantage over passive filters or traditional line reactors. This active infeed capability actively compensates for harmonics, leading to a power factor close to unity and dramatically reduced mains feedback. This not only enhances energy efficiency but also ensures compliance with IEC 61000-3-12, a critical factor in sensitive grid environments. The liquid-cooled design is a key differentiator, allowing for exceptionally high power density and a compact footprint, which is crucial for space-constrained industrial control cabinets. Compared to air-cooled variants or separate component solutions, this integrated module simplifies installation and maintenance while offering superior thermal management for sustained peak performance. Its positioning is firmly within high-performance drives and complex automation solutions where precise control, grid compatibility, and robust operation are paramount.

Key Application Scenarios

This 6SL3735-7KL41-0MA0 module is engineered for demanding applications requiring high dynamic performance and precise motor control. It excels in complex machine tools, printing presses, and automated production lines where rapid acceleration, deceleration, and accurate positioning are critical. Its capability to handle high power ratings makes it suitable for applications such as large extruders, high-speed winders, and sophisticated material handling systems. The liquid cooling system is particularly beneficial in environments with elevated ambient temperatures or where continuous operation at maximum capacity is expected, such as in chemical processing or heavy manufacturing. Its seamless integration with other SINAMICS S120 components allows for scalable solutions, from single-axis drives to complex multi-axis coordinated motion control systems.

Practical System Integration Guidance

Integrating the SIEMENS 6SL3735-7KL41-0MA0 requires careful planning, especially concerning the liquid cooling circuit. A closed-loop cooling system with a suitable heat exchanger and coolant (e.g., water-glycol mixture) is mandatory. The module's power terminals require appropriately sized conductors for 985A, and proper torque must be applied to ensure secure connections. For optimal performance, it is typically paired with a SINAMICS S120 Control Unit (CU) that manages motor control algorithms and communication. Wiring between the line module, control unit, and motor must adhere to Siemens' recommended practices to prevent electromagnetic interference. Commissioning involves parameterizing the control unit via SINAMICS STARTER software, defining motor data, control modes (e.g., vector control, servo control), and communication settings. Specific safety parameters, such as overcurrent and overvoltage thresholds, should be configured based on the application's requirements and the connected motor's specifications.

Operation and Risk Mitigation

Operating the SINAMICS S120 Active Line Connection Module demands adherence to safety protocols. Ensure all personnel are trained on high-voltage safety procedures and that the module is properly grounded. The liquid cooling system must be monitored for leaks and optimal coolant flow and temperature; failure to maintain adequate cooling can lead to thermal overload and module damage. Common fault codes often relate to drive faults (e.g., F7000, F7001 for overcurrent) or communication errors. Before troubleshooting, always disconnect power and verify that the DC bus capacitors have discharged. Regular checks of the liquid cooling circuit's integrity and performance are critical for preventing unexpected shutdowns and potential equipment damage. Consulting the official SIEMENS SINAMICS S120 documentation for specific fault code interpretations and resolution steps is essential.

Scalability & Long-Term Value

The SINAMICS S120 platform, including the 6SL3735-7KL41-0MA0, is designed for exceptional scalability and long-term value. This module can be seamlessly integrated into larger SINAMICS S120 drive systems, allowing for the expansion of controlled axes or increased power capacity by adding more modules in parallel or in conjunction with other line modules. Its compatibility with various communication protocols like PROFINET and PROFIBUS ensures interoperability with a wide range of Siemens PLCs and third-party automation systems, facilitating integration into existing or future control architectures. Furthermore, the SINAMICS S120 platform is continuously supported by Siemens with firmware updates, enhancing functionality and addressing evolving industry standards, thereby protecting the long-term investment. Integration with Industrial Internet of Things (IIoT) solutions through compatible control units enables advanced diagnostics, predictive maintenance, and optimized performance monitoring.

Frequently Asked Questions

What is the primary function of the SIEMENS 6SL3735-7KL41-0MA0?

This module serves as an active line connection for SINAMICS S120 drive systems, ensuring clean power input to the drive. It actively compensates for harmonics, improving power quality and grid compliance.

It provides a stable DC bus voltage for the inverters connected to it, enabling precise motor control. The 630kW rating highlights its capacity for high-power industrial applications.

Its liquid-cooled design allows for efficient heat dissipation, enabling compact installations and high power density operations.

How does the liquid cooling system of the 6SL3735-7KL41-0MA0 work?

The module utilizes a dedicated liquid cooling circuit to dissipate heat generated during operation. A heat exchanger transfers thermal energy from the module to a circulating coolant.

Typically, a water-glycol mixture is used as the coolant, pumped through internal channels within the module. This ensures efficient thermal transfer even under high load conditions.

The cooling system requires a connection to an external cooler or chiller to maintain the coolant temperature within the specified operating range for optimal performance.

What are the main advantages of using an active line connection module like the 6SL3735-7KL41-0MA0?

Active line connection modules significantly reduce harmonic distortion fed back into the power grid. This active infeed technology provides a near-unity power factor, enhancing energy efficiency.

They offer superior performance compared to passive filters, ensuring compliance with strict grid codes (e.g., IEC 61000-3-12). This reduces the need for external harmonic filters.

The compact, liquid-cooled design allows for higher power density, saving valuable cabinet space and enabling operation in demanding thermal environments.