HEIDENHAIN TNC 620 (340 56x-01) - Manual (Page 46)

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2.1 S
w
itc
h
-On, S
w
itc
h
-Of
f
2.1 Switch-On, Switch-Off
Switch-on
Switch on the power supply for control and machine. The TNC then
displays the following dialog:
TNC is started
TNC message that the power was interrupted—clear
the message.
The PLC program of the TNC is automatically compiled.
Switch on external dc voltage. The TNC checks the
functioning of the EMERGENCY STOP circuit.
Cross the reference points manually in the displayed
sequence: For each axis press the machine START
button, or
Cross the reference points in any sequence: Press
and hold the machine axis direction button for each
axis until the reference point has been traversed.
Switch-on and crossing of the reference points can vary
depending on the machine tool. Refer to your machine
manual.
SYSTEM STARTUP
POWER INTERRUPTED
CONVERT PLC PROGRAM
RELAY EXT. DC VOLTAGE MISSING
MANUAL OPERATION
TRAVERSE REFERENCE POINTS
If your machine is equipped with absolute encoders, you
can leave out crossing the reference marks. In such a
case, the TNC is ready for operation immediately after the
machine control voltage is switched on.