
8. TROUBLESHOOTING
B–64115EN/01
452
(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:
⋅ Timing belt is broken
⋅ Key is removed
⋅ Coupling is loose
⋅ 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.
For details of connection, refer to the following.
<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).
<spindle amplifier>
CNC
JA41
SPM
Spindle
motor
Position
coder
JA7A
JA7B
SPM
JA7A
JA7B
JYA3
Spindle
motor
Position
coder
JYA3
<Analog interface spindle amplifier>
Spindle
motor
Position
coder
CNC
JA41
Analog spindle
amplifier
JA40
(d)A cutting feed block containing a feedrate command (F command)
with a feedrate of 0 is specified.
If FCO (bit 7 of parameter No. 1404) is set to 1, P/S alarm 11 is not
issued even if a feedrate command (F command) with a feedrate of
0 is issued.