6 – 174 HEIDENHAIN Technical Manual TNC 426, TNC 430
Testing an internal
EMERGENCY STOP
For test purposes, an internal EMERGENCY STOP can be simulated in order
to inspect the correct wiring of the machine. The control-is-ready output is
reset. The NC and PLC are no longer operable.
7
77
7 Enter the code number FAILTEST under MOD.
Connection
diagram
In the event of an error, the control-is-ready output must trigger an emergency
stop. The control therefore checks this output every time that line power is
switched on.
Flowcharts Flowchart for:
n TNC 426 CB/PB
n TNC 426 M/12 000 rpm (NC software < 280 476-06)
Danger
Hanging axes must be supported before the test in order to prevent
damage to the machine in case of error.
Note
The circuitry recommended by HEIDENHAIN is illustrated in the Basic
Circuit Diagram.
Ensure that the control-is-ready acknowledgment occurs within 380 ms.
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