HEIDENHAIN TNC 640 (34059x-04) ISO programming - Manual (Page 366)

Programming: Special functions
11.3 Adaptive Feed Control Software Option (AFC)
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TNC 640 | User's Manual for DIN/ISO Programming | 3/2014
The adaptive feed control remains active until you
deactivate it by soft key. The TNC remembers
the setting of the soft key even if the power is
interrupted.
If the adaptive feed control is active in the
control
mode, the TNC internally sets the spindle override to
100 %. Then you can no longer change the spindle
speed.
If the adaptive feed control is active in the
control
mode, the TNC takes over the feed rate override
function:
If you increase the feed rate override, it has no
influence on the control.
If you decrease the feed rate override by more
than 10 % with respect to the maximum setting,
the TNC switches the adaptive feed control off.
In this case the TNC displays a window to inform
you.
In NC blocks containing FMAX, the adaptive feed
control is not active .
Mid-program startup is allowed during active feed
control and the TNC takes the cut number of the
startup point into account.
The TNC shows various pieces of information in the
additional status display when adaptive feed control
is active. See "Additional status displays", page 76. In
addition, in the position display the TNC shows the
symbol
.