Siemens 26000 alarm: Clamped shaft monitoring

Sinumerik detects position deviation in an axis or spindle that should be clamped. It is an alarm from the Servo / ejes area, and in the catalog it is listed as “Clamped shaft monitoring”. On the machine you notice it like this: Channel not ready, A clamped axis drifts, Alarm when applying brake/clamp.

On the shop floor it almost always comes from one of these causes: Freno/clamp insuficiente, Low pressure, Tolerance too small, External load on the axis. Rule out the most likely one on your machine first, before touching parameters or swapping anything.

Reset after recovering support and stable position. Resetting without fixing the cause first only hides the problem: Siemens 26000 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: Identify the axis, Check pressure/brake, Do not machine if the clamped axis moves. That alone will tell you whether it is the program or whether you need to raise a maintenance job.

With Siemens 26000 active, avoid this: Do not bypass safety devices, Do not manipulate energized electrical cabinet, Do not continue producing if the alarm reappears. Skipping any of these points is what turns a minor stop into an expensive breakdown.

If the axis drifts while clamped or the MD/tolerances need adjusting. 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.