SIEMENS 6SL3735-7TG38-1MA3 SINAMICS S120 Active Line Connection Module 900kW 810A Compact No MCB Liquid Cooled 690V

The SIEMENS 6SL3735-7TG38-1MA3 SINAMICS S120 Active Line Connection Module represents a pinnacle of drive technology, offering an unparalleled combination of power, efficiency, and integration for demanding industrial applications. This 900kW, 810A compact module, engineered for 690V operation and featuring liquid cooling, stands out for its robust performance and advanced capabilities. Its active line connection functionality ensures superior power factor correction and harmonic suppression, directly translating into reduced energy costs and a more stable electrical grid within your facility. The absence of an MCB (Miniature Circuit Breaker) in this specific configuration highlights its design for integration into larger, more sophisticated power distribution systems, further emphasizing its industrial-grade nature.

Product Specifications

| Parameter                     | Value                                                |

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

| Product Number                | 6SL3735-7TG38-1MA3                                   |

| Series                        | SINAMICS S120                                        |

| Type                          | Active Line Connection Module                        |

| Power Rating                  | 900 kW                                               |

| Continuous Current            | 810 A                                                |

| Rated Voltage                 | 690 V                                                |

| Cooling Method                | Liquid Cooled                                        |

| Enclosure Type                | Compact                                              |

| Integrated MCB                | No                                                   |

| Control Unit Compatibility    | SINAMICS S120 Control Units                          |

| Communication Interfaces      | PROFIBUS DP, PROFINET                                |

| Protection Class              | IP20                                                 |

| Ambient Temperature (Operation) | 0°C to +45°C (derating may apply)                   |

| Dimensions (H x W x D)        | Varies based on exact configuration, refer to manual |

Core Features & Market Positioning

The SINAMICS S120 Active Line Connection Module distinguishes itself in the high-power drive market through its advanced active line filter technology. This ensures sinusoidal current input, significantly minimizing harmonic distortion and exceeding stringent international standards like EN 61000-3-2 and IEEE 519. This results in a near-unity power factor (up to 0.99) across a wide load range, leading to substantial savings on electricity bills by avoiding reactive power penalties. Its liquid-cooled design allows for exceptionally high power density in a compact footprint, facilitating easier integration into space-constrained control cabinets and reducing overall system footprint. Compared to passive solutions, the active line module offers superior dynamic response and grid support capabilities, making it ideal for applications where power quality and system stability are paramount. Siemens' established reputation for reliability and robust engineering further solidifies its market position as a premier choice for critical industrial automation tasks.

Key Application Scenarios

The SIEMENS 6SL3735-7TG38-1MA3 SINAMICS S120 Active Line Connection Module is engineered for heavy-duty applications demanding precise control and exceptional power quality. It is a cornerstone in high-performance variable speed drive systems for pumps, fans, compressors, and extruders in sectors such as oil and gas, petrochemicals, mining, and heavy manufacturing. Its capability to handle high power ratings (900 kW) and continuous currents (810 A) makes it suitable for driving large-scale machinery in continuous process industries. The module's active line connection is particularly beneficial in grids with sensitive equipment or where harmonic distortion is a concern, ensuring reliable operation of the driven machinery and the overall plant electrical system. This unit is also a key component in complex material handling systems, large HVAC systems for industrial facilities, and advanced water treatment plants where energy efficiency and grid compliance are critical operational parameters.

Practical System Integration Guidance

Integrating the SIEMENS 6SL3735-7TG38-1MA3 SINAMICS S120 module requires careful planning, especially concerning its liquid cooling system and high voltage (690V) operation. The liquid cooling circuit must be designed with appropriate circulation pumps, heat exchangers, and coolant fill levels to maintain optimal operating temperatures and prevent thermal derating. Power cabling must adhere strictly to IEC standards for 690V systems, ensuring proper insulation, grounding, and termination techniques to prevent electrical hazards and ensure signal integrity. Connection to the SINAMICS S120 control units, such as the CU320-2, is typically established via dedicated interfaces, and configuration is managed through the STARTER commissioning software. When replacing existing line connections or integrating into new systems, ensuring compatibility with upstream switchgear and downstream motor feeders is crucial, with bypass configurations considered for critical uptime requirements.

Operation and Risk Mitigation

Safe operation of the SIEMENS 6SL3735-7TG38-1MA3 SINAMICS S120 Active Line Connection Module mandates strict adherence to electrical safety protocols and the manufacturer's guidelines. The liquid-cooled nature of this module requires diligent monitoring of the coolant loop for leaks, proper fluid levels, and operating temperature, as deviations can lead to system shutdowns or component damage. Given the 690V rating, all personnel working on or near the module must be trained and qualified for high-voltage electrical work and follow lockout/tagout procedures rigorously. While the active line connection inherently reduces harmonic issues, it's essential to monitor grid voltage and frequency for compliance with the module's operating range to prevent potential faults. Common troubleshooting often involves checking fault codes displayed on the control unit's interface, which can point to issues like overcurrent, overvoltage, undervoltage, or thermal alarms related to the liquid cooling system.

Scalability & Long-Term Value

The SIEMENS 6SL3735-7TG38-1MA3 SINAMICS S120 Active Line Connection Module is designed for scalability and long-term value within the broader SINAMICS S120 platform. Its modular architecture allows for the expansion of drive systems by paralleling multiple modules or integrating additional intelligent units as power demands increase. Compatibility with Siemens' established communication protocols like PROFINET and PROFIBUS ensures seamless integration into existing or future industrial automation networks, including those supporting Industry 4.0 initiatives and the Industrial Internet of Things (IIoT). The active line technology itself contributes to long-term value by enhancing energy efficiency, reducing operational costs, and minimizing grid impact, thereby extending the lifespan of associated electrical infrastructure. Siemens' commitment to ongoing software updates and dedicated technical support further underpins the enduring value and reliability of this drive solution.

Frequently Asked Questions

What is the primary function of the SIEMENS 6SL3735-7TG38-1MA3?

This module acts as an active line connection, conditioning power fed to the drive system. It actively corrects power factor and suppresses harmonics.

It ensures superior power quality for connected motor drives. This results in reduced energy consumption and grid disturbance.

The unit is designed for high-power 690V applications, offering robust performance and reliability.

How does liquid cooling benefit this module?

Liquid cooling allows for extremely efficient heat dissipation from the power components. This enables a very compact design for high power ratings.

Higher thermal performance means the module can sustain full output for longer periods without derating. It also increases overall component lifespan.

This system requires a dedicated liquid cooling loop with appropriate pumps and heat exchangers for optimal operation.

What are the main advantages of active line connection technology?

Active line connection offers near-unity power factor correction across varying loads. This minimizes reactive power charges from utility providers.

It significantly reduces harmonic distortion injected back into the power grid, meeting strict standards. This protects sensitive equipment and improves overall grid stability.

The technology provides dynamic response and grid support, unlike simpler passive solutions. It's ideal for demanding industrial environments.

Is this module compatible with older Siemens drive systems?

Compatibility depends on the specific older system's communication and voltage capabilities. It is designed for the SINAMICS S120 platform.

Integration into systems predating SINAMICS S120 may require significant retrofitting or gateway devices. Always consult Siemens' compatibility matrices.

For optimal performance and ease of integration, it is recommended for use within the modern SINAMICS S120 ecosystem.

What are the typical fault codes associated with this module?

Fault codes can relate to power supply issues like over/undervoltage. Thermal warnings for the liquid cooling system are also common.

Motor-related faults such as overcurrent or short circuits will also be reported. Drive control errors are another category of potential faults.

Refer to the SINAMICS S120 system manual for a comprehensive list and diagnostic procedures for specific fault codes.

Can this module be used in a standard industrial control cabinet?

Due to its 900kW power rating and liquid cooling, it is a large component. Its physical size and cooling requirements must be accommodated.

While compact for its power, it still requires significant space and specialized infrastructure for the liquid cooling system. Standard cabinets may not suffice without modifications.

Ensure the cabinet provides adequate airflow for auxiliary components and access for maintenance of the cooling loop.

What safety precautions are essential when installing or maintaining this unit?

Always follow strict lockout/tagout procedures for high-voltage equipment. Ensure all personnel are qualified for 690V electrical work.

Thoroughly inspect the liquid cooling circuit for leaks before powering up. Verify correct coolant type and fill levels.

Proper grounding and adherence to all wiring regulations are paramount to prevent electrical hazards.

How is the SIEMENS 6SL3735-7TG38-1MA3 commissioned?

Commissioning typically involves connecting it to a SINAMICS S120 control unit and configuring parameters via Siemens' STARTER software. Power and communication links must be established.

Initial setup includes defining motor data, control modes, and safety functions. The liquid cooling system must be operational and stable.

System testing under load, verification of active line performance metrics, and integration into the plant's control system follow initial configuration.

What is the role of the "No MCB" designation?

The absence of an integrated Miniature Circuit Breaker indicates this module is designed for larger, centralized power distribution systems. It assumes upstream protective devices are in place.

This configuration simplifies the module's internal design, focusing on its core active line connection functionality. It's intended for robust industrial power networks with engineered protection schemes.

Installation requires integration into a panel with appropriate, rated circuit breakers or fuses that conform to the overall system's safety and protection strategy.

What is the expected lifespan and maintenance schedule for this module?

With proper operation and adherence to cooling requirements, the module is built for long industrial service life. Regular checks of the liquid cooling system are key.

Scheduled maintenance should include periodic inspection of electrical connections, coolant quality testing, and filter replacement if applicable to the cooling circuit.

Software updates for the control unit can also enhance performance and reliability over time. Always consult Siemens' recommended maintenance schedule.