February 2012 24 – 395
24.2 Possible error causes
îš„ Heavy contamination. --> Key functions may be impaired.
îš„ Jammed chips. --> Key gets stuck.
îš„ Pressure contact defective. --> Key no longer reports actuation.
îš„ Defective switch (EMERGENCY STOP, CONTROL ON, NC START, NC STOP)
îš„ HSCI connection error
îš„ Connector defective
îš„ Supply voltage missing
îš„ Defective PLC output
îš„ Lamp in the button burnt out
îš„ Liquid has penetrated
îš„ Board defective
îš„ Interface of a control component defective
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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