HEIDENHAIN iTNC 530 Service Manual page 270

Troubleshooting
X44
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Checking X44
Switch main switch of machine on
Measure 24 V supply voltages at connector X44
24 V voltages available?
Contacts o.k.?
Yes
Switch main switch of machine off
Dismount MC
(before doing so, label cables and/or
connectors, if required.)
Check fine-wire fuses on PLC board
Fine-wire fuses o.k.?
MC probably defective (PLC board, etc.)
No
No
Yes
Repair defect in electrical
cabinet etc.
Replace fine-wire fuses
HEIDENHAIN Service Manual iTNC 530