
APPENDIX
B–63505EN/02
A. ALARM LIST
315
(9) Serial spindle alarms
Number Message Contents
749 S–SPINDLE LSI ERROR It is serial communication error while system is executing after power
supply on. Following reasons can be considered.
1) Optical cable connection is fault or cable is not connected or cable
is cut.
2) MAIN CPU board is fault.
3) Spindle amp. printed board is fault.
If this alarm occurs when CNC power supply is turned on or when
this alarm can not be cleared even if CNC is reset, turn off the power
supply also turn off the power supply in spindle side.
750 SPINDLE SERIAL LINK START
FAULT
This alarm is generated when the spindle control unit is not ready for
starting correctly when the power is turned on in the system with the
serial spindle.
The four reasons can be considered as follows:
1) An improperly connected optic cable, or the spindle control unit’s
power is OFF.
2) When the NC power was turned on under alarm conditions other
than SU–01 or AL–24 which are shown on the LED display of the
spindle control unit.
In this case, turn the spindle amplifier power off once and perform
startup again.
3) Other reasons (improper combination of hardware)
This alarm does not occur after the system including the spindle con-
trol unit is activated.
4) The second spindle (when SP2, bit 4 of parameter No. 3701, is 1)
is in one of the above conditions 1) to 3).
See diagnostic display No. 409 for details.
751 FIRST SPINDLE ALARM
DETECTION (AL–XX)
This alarm indicates in the NC that an alarm is generated in the spindle
unit of the system with the serial spindle. The alarm is displayed in form
AL–XX (XX is a number). The alarm number XX is the number indicated
on the spindle amplifier. The CNC holds this number and displays on the
screen.
752 FIRST SPINDLE MODE CHANGE
FAULT
This alarm is generated if the system does not properly terminate a
mode change. The modes include the Cs contouring, spindle position-
ing, rigid tapping, and spindle control modes. The alarm is activated if
the spindle control unit does not respond correctly to the mode change
command issued by the NC.
754 SPINDLE–1 ABNORMAL TORQUE
ALM
Abnormal first spindle motor load has been detected.
761 SECOND SPINDLE ALARM
DETECTION (AL–XX)
Refer to alarm No.751. (For 2nd axis)
762 SECOND SPINDLE MODE
CHANGE FAULT
Refer to alarm No.752.(For 2nd axis)
764 SPINDLE–2 ABNORMAL TORQUE
ALM
Same as alarm No.754 (for the second spindle)