Siemens Drive Fault 7902 〈Verified – PICK〉

If you work with Siemens Sinamics drives (G120, S120, G130, etc.), you’ve likely encountered a sudden machine shutdown accompanied by alarm code 7902 . Few things stop production faster than a drive fault, but understanding what “7902” means is the first step to getting back up and running.

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In this post, we’ll break down what fault 7902 is, why it happens, and—most importantly—how to fix it. Fault 7902 translates to “Motor overspeed.”