SIEMENS 6SL3735-7TG37-4LA3 SINAMICS S120 Active Line Connection Module 800kW 735A Liquid Cooled for 690V Systems IP21

The SIEMENS 6SL3735-7TG37-4LA3 SINAMICS S120 Active Line Connection Module is a high-performance power module designed for demanding industrial applications. This liquid-cooled unit delivers 800kW of power at 735A and is specifically engineered for 690V systems, offering IP21 protection for robust operation. Its advanced active line connection technology ensures superior power quality and grid compatibility, making it an ideal choice for optimizing motor control in complex industrial environments. Key advantages include enhanced energy efficiency, precise motion control, and seamless integration into sophisticated automation architectures.

Product Specifications

| Parameter                 | Value                                    |

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

| Product Number            | 6SL3735-7TG37-4LA3                       |

| Product Family            | SINAMICS S120                            |

| Module Type               | Active Line Connection Module            |

| Rated Power               | 800 kW                                   |

| Rated Current             | 735 A                                    |

| Cooling Method            | Liquid Cooled                            |

| System Voltage            | 690 V                                    |

| Enclosure Protection      | IP21                                     |

| Control Unit Compatibility | Typically with Siemens S120 Control Units |

Core Features & Market Positioning

The SINAMICS S120 Active Line Connection Module distinguishes itself through its active inverter technology, which provides genuine sinusoidal current feedback to the grid, thereby minimizing harmonic distortion and improving power factor. This inherent capability reduces the need for external line filters, simplifying system design and saving valuable installation space. In the competitive landscape of industrial drives, the 6SL3735-7TG37-4LA3 is positioned as a premium solution for applications demanding high power density, exceptional energy efficiency, and advanced grid interaction features. Its liquid-cooling design further enhances its performance and reliability in continuous high-load operations compared to air-cooled alternatives.

Key Application Scenarios

This high-capacity active line connection module is ideally suited for a wide array of heavy-duty industrial applications. It is a critical component in large-scale motor drives for sectors such as chemical processing, oil and gas, mining, and material handling, where consistent and powerful motor control is paramount. Applications like large pump and fan drives, extruders, and complex conveyor systems benefit significantly from the precise torque control and regenerative capabilities offered by the SINAMICS S120 platform. Its suitability for 690V systems also makes it a direct fit for industrial plants already operating at these higher voltage levels, simplifying retrofits and new installations.

Practical System Integration Guidance

Integrating the SIEMENS 6SL3735-7TG37-4LA3 module into a SINAMICS S120 drive system typically involves connecting it to the appropriate DC bus voltage supply (often from a transformer or another line module) and then to the motor via line-side terminals. Proper liquid cooling setup is crucial; this includes connecting the module to a suitable liquid cooling circuit with appropriate flow rates and coolant temperature control to maintain optimal operating conditions. For control, it interfaces with a SINAMICS S120 Control Unit, which manages motor commutation, speed, and torque. Configuration and parameterization are performed using Siemens engineering software such as SIMOTION SCOUT or STARTER, allowing for detailed setup of drive functions, safety features, and communication protocols.

Operation and Risk Mitigation

Safe operation of the SIEMENS 6SL3735-7TG37-4LA3 necessitates adherence to strict installation and maintenance protocols, especially concerning its liquid-cooled nature. Ensuring the cooling system is functioning correctly and the coolant is within specified temperature ranges is vital to prevent thermal overload and potential damage. Electrical safety, including proper grounding, insulation, and adherence to the 690V system's safety regulations, must be rigorously observed. Users should be trained on emergency stop procedures and the meaning of any status indicators or fault codes displayed by the associated control unit. Regular inspection of cooling hoses, connections, and the coolant itself for leaks or degradation will mitigate risks associated with fluid ingress or system failure.

Scalability & Long-Term Value

The SINAMICS S120 platform, including the 6SL3735-7TG37-4LA3 module, offers significant scalability for expanding or upgrading industrial automation systems. Its modular design allows for the integration of multiple drive components and line modules to achieve higher power ratings or increased system redundancy. Compatibility with Siemens' broader TIA Portal environment facilitates seamless integration with other Siemens automation products, such as PLCs (SIMATIC) and HMIs, enabling the creation of unified and intelligent factory solutions. This forward-looking design supports the adoption of Industrial IoT (IIIoT) and digital twin concepts, allowing for advanced diagnostics, predictive maintenance, and optimized operational efficiency over the long term.

FAQs

What are the primary benefits of using a liquid-cooled S120 active line connection module?

Liquid cooling allows for higher power density and continuous operation at full load. It also leads to more efficient heat dissipation, potentially extending component lifespan.

This cooling method typically results in a quieter operation compared to air-cooled units. It is essential for high-power applications where thermal management is critical.

How does the active line connection technology of the 6SL3735-7TG37-4LA3 benefit grid performance?

Active line connection provides a highly sinusoidal current feedback to the grid. This significantly reduces harmonic distortion, improving power factor and grid compliance.

It also enables active power factor correction, leading to energy savings and reduced reactive power costs. The technology simplifies grid integration by often negating the need for bulky external filters.

What is the typical operating temperature range for the liquid coolant in the SIEMENS 6SL3735-7TG37-4LA3?

Specific coolant temperature ranges are detailed in the product's official documentation. Generally, maintaining optimal temperature prevents thermal stress on components.

Deviations outside the specified range can lead to reduced performance or system faults. Always refer to the Siemens technical manual for precise figures and guidelines.

Can the 6SL3735-7TG37-4LA3 be used in systems with a voltage other than 690V?

This module is specifically designed and rated for 690V systems. Using it outside this specified voltage range can lead to equipment damage and safety hazards.

System voltage compatibility is a critical parameter for power electronics. Always ensure your system voltage matches the module's rating for reliable operation.

Consult Siemens documentation for any potential voltage adaptation or multi-voltage solutions within the SINAMICS family.

What types of motors are compatible with the SINAMICS S120 S120 6SL3735-7TG37-4LA3?

The module is designed to control various types of AC motors, including asynchronous and synchronous motors. It offers precise control for both standard and high-dynamic applications.

Compatibility extends to different motor feedback systems (encoders, resolvers) for closed-loop control. Ensure the motor's power and voltage ratings align with the drive's capabilities.

Refer to the SINAMICS S120 system manual for a comprehensive list of motor types and specific configuration requirements.

What safety features are integrated into the SINAMICS S120 6SL3735-7TG37-4LA3?

The SINAMICS S120 platform includes integrated safety functions, such as Safe Torque Off (STO). This is a fundamental safety measure to prevent unexpected machine movement.

Additional safety functions like Safe Stop 1 (SS1) and Safely Limited Speed (SLS) can be configured via the control unit. Compliance with relevant safety standards like IEC 61508 is typically achieved.

Always ensure that the complete safety concept, including the drive, control unit, and safety logic, is implemented according to applicable safety regulations.

How does the IP21 rating affect the installation environment for this module?

An IP21 rating signifies protection against solid objects larger than 12.5 mm and vertically falling water drops. This implies it is protected against dripping water.

While it offers some protection, it is not suitable for very wet or dusty environments without additional enclosure. It typically requires installation in a control cabinet or protected area.

Ensure the installation location prevents direct water spray or excessive condensation to maintain the integrity of the enclosure.

What is the role of the control unit in a SINAMICS S120 system with this active line module?

The control unit is the "brain" of the SINAMICS S120 drive system. It executes the motor control algorithms and manages all drive functions.

It communicates with the active line module to control power flow and monitor system status. Parameterization, diagnostics, and communication with higher-level controllers occur via the control unit.

Different control units are available, offering varying levels of performance and communication options, to suit specific application requirements.

Are there any specific considerations for commissioning this liquid-cooled module?

Yes, commissioning requires careful setup of the liquid cooling circuit before powering up the drive. Ensure proper coolant fill, circulation, and temperature monitoring are established.

Parameterize the drive system according to the motor and application requirements, including load characteristics and control modes. Perform initial low-power tests before full load application.

Verify all safety functions are correctly configured and tested. The commissioning process should follow Siemens' recommended procedures to ensure optimal performance and safety.

How can I upgrade or expand a system that uses the 6SL3735-7TG37-4LA3?

The modular design of the SINAMICS S120 allows for easy expansion by adding more drive modules or line modules. You can increase power or create redundant configurations.

Compatibility with TIA Portal enables seamless integration with other Siemens automation components, facilitating system-wide upgrades. The platform supports various communication protocols for easy connection to PLCs and network systems.

Future upgrades can also involve incorporating advanced diagnostic tools or IIoT connectivity for enhanced operational insights and predictive maintenance.