
8. TROUBLESHOOTING
B–62755EN/01
348
DRDY signal is turned on before MCON signal is turned on. Or DRDY
is not turned off after MCON signal is turned off.
1 Servo amplifier is faulty.
2 Between servo amplifier and main CPU or between servo amplifier
and option 2 board is faulty.
3 Main CPU or option 2 board is faulty.
CAUTION
When the main CPU board is replaced, all the data stored in
memory is lost. Set the NC data again, referring to chapter
3 “data input/output”.
100
VAC
· Main CPU board
· Option 2 board
DV
RV
RV RLY MCC
DV
Servo amplifier (a series)
SERVOx
–10
–20
*MCOM
*DRDY
–10
–20
JSnB
T1–5,6
From 1st axis to 4th axis are main CPU board. 5th axis or later are option
2 board.
The grid signal is not turned on when the automatic reference position
return by G28 is completed.
Main CPU board or Option 2 board is faulty.
CAUTION
When the main CPU board is replaced, all the data stored
in memory is lost. Set the NC data again, referring to
chapter 3 “data input/output”.
8.19
ALARM 404 AND 405
(*DRDY SIGNAL
TURNED ON)
D Alarm 404
D Causes
D Alarm 405 (Reference
positin return is
abnormal)
D Causes