HEIDENHAIN TNC 620 User Manual page 495

Checking the axis positions
This function must be adapted to the TNC by your
machine manufacturer. Refer to your machine
manual.
After switch-on the TNC checks whether the position of an axis
matches the position directly after switch-off. If a deviation occurs,
this axis is displayed in red on the position display. Axes that are
marked red can no longer be moved while the door is opened.
In such cases you must approach a test position for the axes in
question. Proceed as follows:
Select the Manual operation mode
Execute the approach with NC START to move the axes in the
sequence shown
When the test position has been reached, the TNC asks
whether the position was approached correctly: Confirm
with the OK soft key if the TNC approached the test position
correctly, and with END if the TNC approached the position
incorrectly
If you confirmed with OK, you must confirm the correctness of
the test position again with the permissive key on the machine
operating panel
Repeat this procedure for all axes that you want to move to the
test position
Danger of collision!
Approach the test positions in such a way that no
collision between tool and the workpiece or the
clamping devices can occur. If necessary, pre-
position the axes manually.
The location of the test position is specified by your
machine tool builder. Refer to your machine manual.
HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2015
Optional safety concept (functional safety FS) 14.4
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