SIEMENS 6SL3725-1TG31-0AA3 SINAMICS S120 Single Motor Module 90kW 100A Liquid Cooled IP21 Cabinet 690V

The SIEMENS 6SL3725-1TG31-0AA3 SINAMICS S120 Single Motor Module stands as a high-performance drive solution for demanding industrial applications, offering exceptional power, advanced cooling, and robust control. This liquid-cooled module, rated at 90kW and 100A with a 690V supply, is engineered for superior thermal management and operational efficiency, making it a critical component in complex automation systems. Its integrated design and advanced features ensure reliability and precise motion control, positioning it as a leading choice for industries requiring maximum uptime and performance.

Product Specifications

| Parameter                | Value                               |

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

| Product Number           | 6SL3725-1TG31-0AA3                  |

| Drive Family             | SINAMICS S120                       |

| Motor Type               | Single Motor Module                 |

| Power Rating             | 90 kW                               |

| Continuous Current Rating | 100 A                               |

| Cooling Method           | Liquid Cooled                       |

| Protection Class         | IP21                                |

| Voltage Rating           | 690 V                               |

| Control Unit             | CU320-2 DP/PN                       |

| Communication Interface  | PROFIBUS DP, PROFINET IO            |

| Ambient Temperature      | 0°C to 45°C (without derating)      |

| Dimensions (H x W x D)   | 480 mm x 235 mm x 288 mm (approx.) |

Core Features & Market Positioning

The SIEMENS 6SL3725-1TG31-0AA3 SINAMICS S120 module differentiates itself through its advanced liquid cooling system, which allows for significantly higher power density and extended duty cycles compared to air-cooled counterparts. This robust thermal management is crucial for applications operating in high ambient temperatures or requiring continuous peak performance, a common challenge in sectors like heavy manufacturing and energy. The module's integration within the SINAMICS S120 platform provides seamless compatibility with a wide range of Siemens automation components, enhancing its market position as a versatile and reliable drive solution for sophisticated industrial automation projects. Its ability to deliver precise control and dynamic response makes it a preferred choice for complex motion control tasks where accuracy is paramount.

Key Application Scenarios

This 90kW SINAMICS S120 motor module is ideally suited for heavy-duty applications demanding sustained high performance and efficient heat dissipation. Its liquid-cooled design makes it exceptionally effective in distributed drive systems within industries such as:

  Material Handling: Powering large conveyors, cranes, and automated storage and retrieval systems (AS/RS) in large warehouses and port facilities.  Metal Processing: Driving rolling mills, presses, and cut-to-length lines where high torque and dynamic acceleration/deceleration are essential.  Paper and Pulp Manufacturing: Controlling large rollers and processing machinery that operate continuously under significant load.  Energy Sector: Applications in power generation, such as pump and fan drives in critical infrastructure, or in renewable energy systems requiring robust motor control.

The 690V rating also makes it suitable for applications with higher voltage distribution networks.

Practical System Integration Guidance

Integrating the SIEMENS 6SL3725-1TG31-0AA3 requires careful planning, particularly concerning the liquid cooling system and communication setup. For optimal performance, ensure the primary coolant circuit is properly designed to manage the heat load from the 90kW motor module. This typically involves a closed-loop system with appropriate heat exchangers and circulation pumps, maintaining the coolant temperature within specified limits to prevent thermal derating.

Wiring should strictly adhere to Siemens' guidelines for 690V systems, utilizing correctly rated cables for motor power, control signals, and the cooling fluid connections. The module connects to a Control Unit (CU320-2 DP/PN) via a digital DRIVE-CLiQ interface, enabling advanced diagnostics and communication over PROFIBUS DP or PROFINET IO networks. Parameterization is typically performed using Siemens TIA Portal or STARTER software, where motor data, control modes (e.g., vector control, V/f control), and safety functions are configured.

For commissioning, a step-by-step approach is recommended, starting with basic electrical checks, followed by coolant flow verification, and then incremental motor testing. Initial parameter loading and motor identification routines are critical to ensure the drive accurately matches the motor's characteristics, thereby optimizing performance and preventing damage. Thorough testing under various load conditions, including dynamic performance checks, should be conducted before full system deployment.

Operation and Risk Mitigation

Safe operation of the SIEMENS 6SL3725-1TG31-0AA3 SINAMICS S120 module necessitates strict adherence to safety protocols, particularly given its 690V rating and liquid cooling system. Before any maintenance or inspection, ensure all power sources are isolated, and the drive's DC bus capacitors have fully discharged, a process that can be confirmed via diagnostic indicators or multimeter readings. Personnel must be trained and certified to work on high-voltage industrial equipment and be aware of the specific hazards associated with liquid cooling systems, such as potential leaks and electrical conductivity of the coolant.

Common fault codes for SINAMICS S120 drives often relate to motor overload (e.g., F0001), under-voltage or over-voltage (e.g., F0002, F0003), or internal drive faults. For this liquid-cooled module, specific faults may arise from issues within the cooling circuit, such as low coolant flow (potentially indicated by specific temperature-related error codes, although explicit codes vary by firmware) or sensor failures. Always consult the official SINAMICS S120 documentation for precise fault code meanings and recommended troubleshooting steps. Regular checks of the coolant level, temperature, and pressure, along with visual inspections for leaks, are critical for preventing operational disruptions and potential equipment damage.

Implementing appropriate emergency stop functionalities, safety interlocks linked to the cooling system's operational status, and regularly scheduled preventive maintenance are key risk mitigation strategies. Ensure the IP21 rating is maintained by verifying that all cabinet panels and cable entries are securely sealed to prevent ingress of dust and moisture, which could lead to short circuits or corrosion, especially in environments with high humidity. Utilizing Siemens' diagnostic tools and logging functions can aid in identifying potential issues before they escalate into critical failures.

Scalability & Long-Term Value

The SINAMICS S120 platform, including the 6SL3725-1TG31-0AA3 module, is designed for scalability and long-term value within an industrial automation ecosystem. Its modular architecture allows for straightforward expansion of motor control capabilities by adding further S120 motor modules, controlled by a shared or distributed Control Unit configuration. This facilitates upgrades or capacity increases in production lines without requiring a complete system overhaul.

Compatibility with Siemens' TIA Portal (Totally Integrated Automation) provides a unified engineering framework for configuring, programming, and diagnosing not only the SINAMICS drives but also other Siemens automation components like PLCs (SIMATIC) and HMIs. This integrated approach simplifies project management, reduces engineering time, and enhances system interoperability.

Furthermore, the SINAMICS S120 platform supports integration with Industrial Internet of Things (IIoT) initiatives. Through PROFINET, data from the drive can be collected, analyzed, and utilized for predictive maintenance, energy optimization, and process improvements, thereby contributing to the digital transformation of manufacturing operations and extending the long-term value of the investment.

Frequently Asked Questions

What are the primary benefits of liquid cooling in the SIEMENS 6SL3725-1TG31-0AA3?

Liquid cooling allows for superior heat dissipation, enabling higher power density and continuous operation. It also permits smaller drive footprints in cabinets. This results in more reliable performance and extended component lifespan.

The module can operate at peak capacity for longer durations without thermal throttling. This makes it ideal for demanding industrial environments and heavy-duty applications. Efficient heat removal also leads to increased system uptime.

This advanced cooling technology is crucial for applications with limited space or high ambient temperatures. It ensures consistent drive performance, reducing maintenance needs and operational costs.

How is the SIEMENS 6SL3725-1TG31-0AA3 integrated into a control system?

This module integrates via a CU320-2 control unit, typically using DRIVE-CLiQ. Communication with higher-level controllers is established over PROFIBUS DP or PROFINET IO. This provides comprehensive control and diagnostic capabilities.

The TIA Portal software suite is used for parameterization and programming. It allows for unified engineering of the drive with other Siemens automation components. This simplifies commissioning and ongoing management.

System integration involves proper wiring of power, control, and communication cables. Accurate motor data must be entered into the control unit for optimal performance.

What are the key technical specifications for this 90kW motor module?

The module is rated for 90kW of power and 100A continuous current. It operates with a 690V AC supply voltage. It features liquid cooling and an IP21 enclosure.

Its dimensions are approximately 480x235x288 mm, designed for cabinet installation. The operating ambient temperature range without derating is 0°C to 45°C. It supports PROFIBUS DP and PROFINET IO communication.

The drive is part of the SINAMICS S120 product family, known for its advanced motion control capabilities. It requires a compatible Siemens control unit, such as the CU320-2.

What are common troubleshooting steps for the SINAMICS S120 S120 6SL3725-1TG31-0AA3?

Verify power supply and connections, especially for the 690V rating. Check coolant flow and temperature sensors for the liquid cooling system. Consult the fault code list in the manual for specific error diagnostics.

Ensure correct motor parameters are configured in the control unit. Check communication links between the control unit and the drive module. Review diagnostic buffers for historical fault data.

Perform systematic checks, starting with basic functions and progressively testing under load. If issues persist, contact Siemens technical support with detailed fault information.

What industries commonly utilize the SIEMENS 6SL3725-1TG31-0AA3?

This high-power, liquid-cooled module is prevalent in heavy industries like metal processing and manufacturing. It's also crucial in material handling and logistics operations. Its robust nature suits demanding environments.

The energy sector, including power generation and renewable energy, often employs such drives. Paper and pulp mills also benefit from its continuous operation capabilities. Its 690V rating is advantageous for facilities with higher voltage infrastructure.

Applications requiring precise and dynamic motion control over extended periods are prime candidates. This includes complex machinery in large-scale industrial automation projects.

Can this motor module be integrated with IIoT platforms?

Yes, the SINAMICS S120 S120 6SL3725-1TG31-0AA3 supports integration with IIoT. Its PROFINET interface allows for data exchange with higher-level IT systems. This facilitates remote monitoring and data analysis.

Integration enables advanced functionalities like predictive maintenance and energy management. By collecting operational data, companies can optimize processes and reduce downtime. This aligns with Industry 4.0 initiatives.

Utilizing tools like the TIA Portal, data streams can be configured and directed to cloud platforms or local IIoT gateways. This unlocks the potential for smart manufacturing.

What are the safety considerations when working with this 690V drive?

Always de-energize the system and ensure DC bus capacitors are discharged before maintenance. Personnel must be trained for high-voltage work. Adhere strictly to lockout/tagout procedures.

Be aware of hazards associated with the liquid cooling system, including potential leaks and electrical conductivity. Ensure proper grounding of all components. Use appropriate personal protective equipment (PPE).

Emergency stop circuits and safety interlocks must be correctly implemented and regularly tested. Follow all Siemens safety guidelines meticulously.

How does the liquid cooling system of the 6SL3725-1TG31-0AA3 function?

A coolant, typically a water-glycol mixture, circulates through internal channels within the module. This absorbs heat generated during operation. The heated coolant is then pumped to an external heat exchanger for cooling.

This closed-loop system maintains optimal operating temperatures for the power electronics. It allows the module to dissipate heat more effectively than air-cooled solutions. This is vital for consistent high-power output.

Regular monitoring of coolant levels, temperature, and flow rate is essential. Using approved coolant types and maintaining system integrity prevents performance degradation and potential damage.

What is the role of the CU320-2 control unit with this motor module?

The CU320-2 serves as the "brain" for the SINAMICS S120 system. It executes advanced control algorithms and processes all communication. It manages the motor module's operation based on programmed logic.

It handles motion control functions, including positioning and speed control. It also manages safety functions and communicates with PLCs via PROFIBUS or PROFINET. This provides comprehensive system oversight.

The CU320-2 receives commands, processes feedback, and sends control signals to the motor module. It also provides detailed diagnostics and status information for system monitoring.

What are the advantages of the SINAMICS S120 platform for scalability?

The SINAMICS S120 platform is modular, allowing for easy expansion of motor control. You can add more motor modules to a single drive system. This facilitates upgrades without replacing the entire infrastructure.

Its unified engineering environment, TIA Portal, simplifies integration of new components. This reduces engineering effort and time for system modifications. It ensures compatibility across different modules.

This platform supports a wide range of motor types and sizes, offering flexibility. It is designed to accommodate future growth and evolving automation needs.