Siemens F30005/F30011 alarm: SINAMICS: I2t overload or motor overtemperature

The SINAMICS drive detects calculated thermal overload or excessive motor temperature. It is an alarm from the Servo / ejes area, and in the catalog it is listed as “SINAMICS: I2t overload or motor overtemperature”. On the machine you notice it like this: Alarm after heavy cycles, Motor caliente, Eje/husillo cae bajo carga.

On the shop floor it almost always comes from one of these causes: Excessive mechanical load, Corte demasiado agresivo, Motor mal parametrizado, Insufficient ventilation, Freno rozando. Rule out the most likely one on your machine first, before touching parameters or swapping anything.

Reset after cooling and correcting load/parameters. Resetting without fixing the cause first only hides the problem: Siemens F30005/F30011 trips again and, in the meantime, you keep working with the machine in bad shape.

With the machine stopped and in a safe state, start with these checks: Let it cool down, Check the load and the feeds, Check motor parameters against plate. That alone will tell you whether it is the program or whether you need to raise a maintenance job.

With Siemens F30005/F30011 active, avoid this: Do not keep producing with a hot motor, Do not raise thermal limits to continue. Skipping any of these points is what turns a minor stop into an expensive breakdown.

If repeated with normal load or empty. If you are not sure how far it goes, stop the machine and report it: a repeat alarm always works out cheaper than a crash.

It is critical: there is a real risk of damage to the machine, the tool or a person. Leave the machine stopped, do not keep resetting it to see if it goes away, and call maintenance before producing again. Guidance reference. Always confirm the full text in the exact machine/control manual.