HEIDENHAIN TNC 640 (34059x-02) ISO programming - Manual (Page 354)

Programming: Special functions
11.3 Adaptive Feed Control Software Option (AFC)
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TNC 640 | User's Manual for DIN/ISO Programming | 5/2013
Spindle load monitoring
This feature must be enabled and adapted by the
machine tool builder. Refer to your machine manual.
With the spindle load monitoring function you can easily have the
spindle load monitored in order, for example, to detect overloading
the spindle power.
The function is independent of AFC, i.e. it is not cut-based and
does not depend on teach-in steps. Through the functions that can
be defined by the machine tool builder, you only need to define the
percentage value for spindle limit power with respect to the rated
power.
When the defined limit spindle power range is not maintained, the
TNC conducts an NC stop.