July 2013 8.1 Display and operation 1235
Once the NC program has been run, the learning procedure is finished for
adaptive feed control. The status in the <NC name>.H.AFC.DEP file (SETTINGS
TABLE soft key) must have switched from L (learning) to C (controlling) for each
cut. This way a valid settings file exists for adaptive feed control. As long as
the status is not set to L (learning) and adaptive feed control has been
deactivated with the AFC OFF soft key, the NC program is run with AFC.
If you start the NC program again, the feed-rate override is changed by the
adaptive feed control. The control tries to maintain the spindle power as
constantly as possible at the reference value PREF of the spindle power.
If the AFC is active, the spindle potentiometer is fixedly set to a factor of 100
% for the Program Run operating modes right from the start of cutting.
The data in the <NC name>.H.AFC2.DEP file (EVALUATION TABLE soft key)
determined in the learning phase is compared with the values from
machining with AFC.
Activating/
deactivating AFC
Proceed as follows to activate or deactivate adaptive feed control:
Select the Program Run, Full Sequence operating mode.
Shift the soft-key row.
Activate adaptive feed control: Set the AFC soft key to ON.
Deactivate adaptive feed control: Set the AFC soft key to OFF.
The setting of the AFC OFF/ON soft key is saved, and even if the control is
reset, an emergency stop occurs, or the machine is switched off via the main
switch, the momentary setting of the soft key is stored.
The setting of the AFC OFF/ON soft key is also mapped in PLC word W336.
W336 = 0: Soft key is set to OFF
W336 = 1: Soft key is set to ON
If the AFC soft key is set to ON, the spindle potentiometer is fixedly set to a
factor of 100 % for the Program Run operating modes right from the start of
cutting.
If adaptive feed control is active, the TNC assumes the functions of the
feed-rate override. If you reduce the feed-rate override by more than 10%
of the current setting, then the TNC switches AFC off. In this case the TNC
displays a window, which you can acknowledge with the CE key.
If you set the feed-rate override to less than 50%, the value of the override
potentiometer takes effect. However, AFC is not automatically switched
off here. If the value of the override potentiometer later exceeds the 50%
again, AFC assumes control again.
The TNC shows various pieces of information in the additional status
display when adaptive feed control is active. Please refer to the User's
Manual of your control.
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