This course is for startup engineer and service personnel. It covers the special features of servicing and maintenance for SINAMICS S120 Cabinet Modules. It focuses on the structure, diagnostic functions, and component replacement for power sections in S120CM. It also explains the special features of the modular structure of different Line Modules and Motor Modules as well as the modular SINAMICS S120 cabinet system. Practical exercises by AOP30 and PC-tool StartDrive in TIA Portal are carried out on SINAMICS S120CM.