HEIDENHAIN TNC 620 User Manual page 483

The reference points need only be crossed if the
machine axes are to be moved. If you intend only
to write, edit or test programs, you can select
the Programming or Test run. mode of operation
immediately after switching on the control voltage.
You can cross the reference points later. For this
purpose, in Manual operation mode press the PASS
OVER REFERENCE soft key.
Crossing the reference point in a tilted working plane
Danger of collision!
Make sure that the angle values entered in the menu
for tilting the working plane match the actual angles
of the tilted axis.
Deactivate the "Tilt Working Plane" function before
you cross the reference points. Take care that there
is no collision. Retract the tool from the current
position first, if necessary.
If this function was active when the control was turned on, then
the TNC automatically activates the tilted working plane. The TNC
then moves the axes in the tilted coordinate system when an axis-
direction key is pressed. Position the tool in such a way that a
collision is excluded during the subsequent crossing of the datums.
To cross the datums you have to deactivate the Tilt the working
plane function.
Further Information: "Activating manual tilting:", page 545
If you use this function, then for non-absolute
encoders you must confirm the positions of the
rotary axes, which the TNC displays in a pop-up
window. The position displayed is the last active
position of the rotary axes before switch-off.
If one of the two functions that were active before is active
now, the NC START key has no function. The TNC outputs a
corresponding error message.
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
Switch-on, switch-off 14.1
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