SIEMENS 6SL3735-7TE41-4LA3 SINAMICS S120 Active Line Connection Module 900kW 1405A Liquid Cooled Maximum Duty 400V
The SIEMENS 6SL3735-7KB41-4LA3 SINAMICS S120 Active Line Connection Module is a high-performance power module designed for demanding industrial applications requiring robust motor control and energy efficiency. This liquid-cooled unit delivers a substantial 900kW of power at 1405A and operates at 400V, making it suitable for maximum duty cycles. Its advanced active line connection technology ensures superior power factor correction, reduced harmonic distortion, and bidirectional energy flow, contributing to significant operational cost savings and grid stability.
Product Specifications
| Parameter | Value |
| :------------------------- | :----------------------------------------- |
| Product Number | 6SL3735-7KB41-4LA3 |
| Product Line | SINAMICS S120 |
| Module Type | Active Line Connection Module |
| Power Rating | 900 kW |
| Current Rating | 1405 A |
| Cooling Method | Liquid Cooled |
| Voltage | 400 V |
| Maximum Duty | Maximum Duty |
| Manufacturer | Siemens |
| Technology | Active Line Connection |
| Approvals | cULus, CE, EAC, RCM |
| Protection Class | IP20 |
| Operating Temperature | 0°C to 45°C (derating above 40°C) |
| Dimensions (H x W x D) | 1050 mm x 700 mm x 500 mm (approximate) |
| Weight | 220 kg (approximate) |
| Communication Interfaces | PROFIBUS DP, PROFINET IO (optional modules) |
| Control Type | Vector Control, Servo Control |
| Harmonic Distortion | <5% THD (at rated load) |
| Power Factor Correction | >0.95 (leading/lagging) |
| Regenerative Capability | Yes, bidirectional energy flow |
| Safety Integrated | Yes (STO - Safe Torque Off) |
| Drive System | SINAMICS S120 |
| Application Environment | Industrial Automation, Heavy Industry |
| Control Panel Integration | Yes, with appropriate control units |
| Compliance | RoHS |
Core Features & Market Positioning
The SIEMENS 6SL3735-7KB41-4LA3 stands out in the industrial automation market due to its sophisticated active line connection technology. This feature provides near-unity power factor, significantly reducing reactive power charges and improving overall energy efficiency. Unlike passive filters, active filtering compensates for harmonic distortions dynamically, ensuring cleaner power input and output, which is critical for sensitive equipment and grid compliance. Its liquid-cooled design allows for higher power density and continuous operation at maximum duty, outperforming air-cooled alternatives in environments with high thermal loads. This positions the SINAMICS S120 module as a premium solution for industries prioritizing operational reliability, energy savings, and advanced power quality management.
Key Application Scenarios
The 900kW capacity and robust design of the SIEMENS 6SL3735-7KB41-4LA3 make it exceptionally well-suited for heavy-duty applications. These include large-scale industrial machinery such as rolling mills, extruders, large pumps, and high-power fans in sectors like metals, plastics, and mining. Its regenerative capabilities are invaluable in applications with frequent braking or load fluctuations, such as cranes and elevators, where it can feed energy back into the grid, further enhancing efficiency. The module's ability to maintain stable operation under demanding conditions and its compatibility with the SINAMICS S120 platform make it a prime choice for complex automation tasks requiring precise motor control and high torque.
Practical System Integration Guidance
Integrating the SIEMENS 6SL3735-7KB41-4LA3 requires careful planning, particularly concerning its liquid cooling system and power connections. The module necessitates a dedicated, closed-loop liquid cooling circuit with appropriate heat exchangers to manage its thermal output effectively. Proper sizing of the coolant flow rate and temperature is crucial for maintaining optimal operating conditions and ensuring the longevity of the module. Power connection involves robust cable management for the 400V supply and motor outputs, adhering to strict safety regulations and torque specifications. For control and communication, integration with SINAMICS S120 control units via PROFIBUS DP or PROFINET is standard, requiring appropriate network configuration and parameterization within the Siemens TIA Portal or STARTER software for seamless operation.
Operation and Risk Mitigation
Safe operation of the SIEMENS 6SL3735-7KB41-4LA3 is paramount and hinges on adhering to manufacturer guidelines and electrical safety standards. The "Safety Integrated" STO (Safe Torque Off) function is a critical safety feature that prevents unexpected motor movement during maintenance or emergency situations. Risk mitigation involves regular checks of the liquid cooling system for leaks or blockages, as overheating can lead to component failure. Proper grounding and shielding of power cables are essential to prevent electromagnetic interference and ensure system stability. Common troubleshooting often involves consulting diagnostic LEDs on the module or utilizing the SINAMICS diagnostic buffer for detailed fault code analysis, which can pinpoint issues related to power supply, motor feedback, or communication.
Scalability & Long-Term Value
The SINAMICS S120 platform, to which the 6SL3735-7KB41-4LA3 belongs, offers significant scalability and long-term value. Its modular design allows for the expansion of drive systems by adding more modules or control units to meet increasing production demands. Compatibility with a wide range of Siemens automation components and integration into the TIA Portal ecosystem facilitates seamless upgrades and system enhancements. Furthermore, the module's advanced capabilities align with Industry 4.0 initiatives, enabling integration with IIoT platforms for predictive maintenance, remote monitoring, and data analytics, thereby maximizing operational uptime and return on investment.
Frequently Asked Questions
What are the primary benefits of the SINAMICS S120 Active Line Connection Module?
The active line connection technology provides superior power factor correction. This significantly reduces energy costs and improves grid compatibility by minimizing reactive power.
It also dynamically compensates for harmonic distortions, ensuring cleaner power for connected machinery and compliance with grid regulations. The bidirectional energy flow capability allows for energy regeneration, further boosting efficiency.
What is the role of liquid cooling in this Siemens module?
Liquid cooling is essential for dissipating the substantial heat generated by a 900kW power module operating at maximum duty. It enables higher power density and continuous, reliable operation in demanding thermal environments where air cooling would be insufficient.
This cooling method ensures that the internal components remain within their optimal operating temperature range, extending the module's lifespan and preventing thermal shutdowns. Effective liquid cooling is critical for maintaining performance consistency and preventing premature component degradation.
How does this module integrate into an existing Siemens automation system?
The SIEMENS 6SL3735-7KB41-4LA3 seamlessly integrates with SINAMICS S120 control units via standard industrial communication protocols like PROFIBUS DP and PROFINET IO. Parameterization and configuration are managed through Siemens' TIA Portal or STARTER software environments, allowing for comprehensive control.
This integration enables sophisticated motor control functions, such as precise vector control and servo control, essential for complex machinery. The modular nature of the SINAMICS S120 platform also supports system expansion and upgrades, ensuring long-term adaptability to evolving production needs.
