7. TROUBLESHOOTING
B–63505EN/02
252
(c) Thread cutting does not operate
1) Position coder does not rotate
Check the connection between spindle and position coder
The following failure is considered:
D Timing belt is broken
D Key is removed
D Coupling is loose
D Connector of signal cable is loosened
2) Position coder is faulty
Position coder is connected to the spindle amplifier when serial
interface spindle is used or connected to the CNC when analog
interface spindle is used.
<T series>
Whether A/B phase signals from the position coder are read
correctly, can be judged also by the spindle speed display on the
CRT screen (position screen). (However, it is not displayed
when PARAM 3105#2=0).