Heidenhain Wrong RPM alarm: RPM out of range

The TNC rejects a spindle speed outside the range allowed by the machine/control. It is an alarm from the Spindle area, and in the catalog it is listed as “RPM out of range”. On the machine you notice it like this: Fails when executing S/M3-M4, Spindle block message, Appears at extreme speeds.

On the shop floor it almost always comes from one of these causes: S above the maximum of the spindle, S below the minimum, Gear change not performed, Post mal calculado. Rule out the most likely one on your machine first, before touching parameters or swapping anything.

Reset tras corregir S/gama. Resetting without fixing the cause first only hides the problem: Heidenhain Wrong RPM 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: Verificar rango de husillo, Comprobar gama (alta/baja), Set S to valid value. That alone will tell you whether it is the program or whether you need to raise a maintenance job.

With Heidenhain Wrong RPM active, avoid this: Do not raise maximum spindle parameters to silence, Do not machine outside the range. Skipping any of these points is what turns a minor stop into an expensive breakdown.

If the range does not change or the spindle does not reach speed. 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 a stop alarm: the cycle will not continue until you fix the cause. It does not always mean serious damage, but it leaves the machine where it is and you have to check it before running again. Guidance reference. Always confirm the full text in the exact machine/control manual.