Possible Causes Of Errors - HEIDENHAIN iTNC 530 Service Manual

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

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DANGER
HEIDENHAIN recommends to check the function of the EMERGENCY STOP button on
the machine operating panel or operating tableau in regular intervals!
Note
The TE 535Q features an integrated machine operating panel.
Severe contamination --> Key functions are possibly damaged.
Jammed chips. --> Key gets stuck.
Pressure contact defective --> Key no longer reports actuation.
Note
Defective keys either do not contact any more or are in permanent contact.
Defective switch (EMERGENCY STOP, CONTROL ON, NC START, NC STOP)
Note
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.
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 Service Manual iTNC 530