HEIDENHAIN TNC 620 User Manual page 567

Retraction after a power interruption
The Retraction mode is enabled and adapted by
the machine manufacturer. Refer to your machine
manual.
With the Retraction mode of operation you can disengage the tool
from the workpiece after an interruption in power.
The Retraction mode of operation is selectable in the following
conditions:
Power interrupted
No control voltage for the relay
Traverse reference points
The Retraction operating mode offers the following modes of
traverse:
Mode Function
Machine axes Movement of all axes in the original
coordinate system
Tilted system Movement of all axes in the active
coordinate system
Effective parameters: Position of the tilting
axes
Tool axis Movements of the tool axis in the active
coordinate system
Thread Movements of the tool axis in the active
coordinate system with compensating
movement of the spindle
Effective parameters: Thread pitch and
direction of rotation
If machining plane tilting (option number 8) is
enabled on your TNC, then the Tilted System
traverse mode is available.
The TNC selects the mode of traverse and the associated
parameters automatically. If the traverse mode or the parameters
were not correctly chosen, you can change them manually.
HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2015
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