25 – 402 HEIDENHAIN Service Manual iTNC 530 HSCI
Threshold
sensitivity
Shock or vibrations can cause a slight motion at the handwheel and produce an unintentional axis
movement. The "threshold sensitivity“ of the handwheel encoder is entered in MP7660.
Signal paths Overview --> See ”Signal paths in the console and to the MC 62xx” on page 23 – 367
25.2 Error messages
The following error messages may be displayed, if there are problems related to handwheels:
Handwheel?
Handwheel not ready x
CC: Handwheel permissive button depressed
MC: Handwheel permissive depressed
25.3 Possible error causes
Handwheel not attached
Connected handwheel does not match the entry in MP7640
The portable handwheel was dropped down and damaged.
Heavy contamination --> Key functions are impaired.
Jammed chips --> Key gets stuck.
Pressure contact defective --> Key no longer reports actuation.
EMERGENCY STOP button defective
Potentiometers defective
Board defective
Contaminated or defective handwheel encoder (optical signal evaluation impaired)
Liquid has penetrated
Interruption in handwheel cable or connector
Defective contact in the cable adapter --> Permanent EMERGENCY STOP or permissive keys
nonfunctional
Shock or vibrations --> Unintended traverse movements
Handwheel interface on MB 620 or on HSCI adapter PLB 6001 defective
Problems with the +12 V power supply
Short circuit in cable or handwheel
Refer to the iTNC 530 HSCI User’s Manual for a detailed description on operating the electronic
handwheels.
If there is an active NC STOP signal (e.g., key is stuck) from the handwheel, the machine cannot
be traversed any more.
Defective keys either do not contact any more or are in permanent contact.
The MB 620 and the HSCI adapter PLB 6001 feature "polyfuses“.
Polyfuses are electronic fuses that become highly resistive if an overload occurs and thus
separate defective peripherals (e.g., handwheel) from the low voltages of the MB 620 or the
HSCI adapter PLB 6001.
Polyfuses have a self-resetting function ("self-healing effect").
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