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