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⚡SINAMICS G120: modular architecture for modern industry 🔌⚡

The structure of the SINAMICS G120 consists of three main elements:

Control Unit (CU) → manages logic, communication, and regulation
Power Module (PM) → supplies power to the motor
Option & Interface Modules → expand functionality, I/O, and protocols

This separation enables easier maintenance and fast replacement of only the necessary components, reducing costs and downtime.

🏭 Typical applications of SINAMICS G120 📦

G120 converters are among the most widely used by OEMs and system integrators thanks to their excellent performance and compact format. The most common applications include:

🌀 Industrial fans and HVAC
💧 Pumping systems and water treatment
🚚 Conveyors, belts, and logistics
📦 Packaging and wrapping machines
🔧 Light machine tools
🏗️ General factory automation
🧪 Industrial processes requiring variable speed and torque

Thanks to the PM250, G120 drives are also widely used in high-regeneration applications.

📘 Overview of G120 modules within the Siemens 6SL32xx roots 🗂️

Below is the technical overview of the most important modules.

👉 6SL3200 → Control Units CU240 / CU250 / CU230
The Control Units manage:

• vector control

• PROFIBUS/PROFINET communication

• integrated safety functions (depending on the version)

• start/stop logic and motor parameters

CU240 and CU250 are ideal for applications requiring precise regulation, while CU230 is optimized for pumps and fans.

👉 6SL3201 → Power Modules PM240 / PM240-2
General-purpose Power Modules featuring:

• vector control with/without encoder

• integrated protections

• modular mounting

• support for G120 Control Units

The PM240-2 is the most efficient and compact evolution.

👉 6SL3202 → Power Modules PM250 ♻️⚡
Regenerative version with energy recovery:

• returns energy to the grid during braking

• reduces energy consumption

• eliminates braking resistors in many applications

• ideal for fast cycles and frequent stops

👉 6SL3203 → Option Modules / Interfaces / I/O
Optional modules for:

• I/O expansion

• additional protocols

• integrated safety

• encoder and sensor connections

Essential for customizing the drive according to the application.

👉 6SL3210 → Power Modules G120C / G120X
Compact Power Modules designed for:

• G120C → compact installations and OEM machinery

• G120X → infrastructure, water, ventilation, HVAC, pumps

They offer high power density and easy integration.

💡 Why SINAMICS G120 are essential 💡

SINAMICS G120 converters are an industrial benchmark for general-purpose automation thanks to their reliability, modular structure, and adaptability to a wide range of applications. They ensure precise speed and torque control, integrated safety features, advanced energy efficiency (especially with regenerative PM250 modules), and immediate diagnostics via PROFINET or PROFIBUS.

The possibility of quickly replacing Control Units, Power Modules, or option modules reduces downtime and facilitates preventive maintenance. For this reason, G120 drives are a key solution to ensure operational continuity, energy optimization, and stable production processes.

🔧 E-Repair services for SINAMICS G120 🔧

E-Repair, the only Siemens-authorized Service Partner in Europe, provides complete support for all SINAMICS G120 series modules:

👉 Siemens-certified repair of 6SL3… modules
🔧 Full refurbishment with Siemens test benches
💾 Parameter backup and restoration
🚚 On-site / remote assistance
⚡ Advance shipment of refurbished units for immediate restart
🧼 Technological washing and decontamination
🩺 Fault diagnostics and preventive analysis
🔐 Safety Integrated testing according to Siemens standards

♻️ Standards and certifications ♻️

BS 8001:2017
AFNOR XP X30-901:2018
ISO 14064-1
E-Repair ESG Guidelines

🚀 Conclusions 🚀

SINAMICS G120 drives represent a reliable and flexible solution for general-purpose and process applications. Their modular architecture, combined with advanced energy-efficiency options, makes them an ideal choice for companies aiming at operational continuity and optimized energy consumption.

E-Repair supports the entire lifecycle of G120 modules with Siemens-certified repair and refurbishment, rapid assistance, and evolved MAAS – Maintenance as a Service solutions, ensuring reliable, efficient, and sustainable plants.

🟢 Pillar Page article for the technical mapping of the Siemens SINAMICS G120 series: Power Modules and Control Units