23 – 390 HEIDENHAIN Service Manual iTNC 530
If a machine operating panel from the machine tool builder is used, please refer to its circuit
diagram from which you can see the wiring of the keys.
23.2 Possible Causes of Errors
Severe contamination --> Key functions are possibly damaged.
Jammed chips. --> Key gets stuck.
Pressure contact defective --> Key no longer reports actuation.
Defective switch (EMERGENCY STOP, CONTROL ON, NC START, NC STOP)
Defective cable between MB and control
Connector defective
Supply voltage missing
Defective PLC output
Lamp in the button has burn through
Liquid has penetrated
Board defective
Defective interface on the control
HEIDENHAIN recommends to check the function of the EMERGENCY STOP button on
the machine operating panel or operating tableau in regular intervals!
The TE 535Q features an integrated machine operating panel.
Defective keys either do not contact any more or are in permanent contact.
If the NC STOP signal (low-active) between MB and control is interrupted, the machine
cannot be traversed any more. The same problem is caused, if the NC STOP key gets stuck.
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