
APPENDIX
B–63004EN/02
G. ALARM LIST
837
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 or option 2 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.
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.
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)
772 SPINDLE–3 MODE CHANGE
ERROR
Same as alarm No. 752 (for the third spindle)
774 SPINDLE–3 ABNORMAL TORQUE
ALM
Same as alarm No. 754 (for the third spindle)
782 SPINDLE–4 MODE CHANGE
ERROR
Same as alarm number 752 (for the fourth spindle)
784 SPINDLE–4 ABNORMAL TORQUE
ALM
Same as alarm number 754 (for the fourth spindle)
The details of spindle alarm No. 750 are displayed in the diagnosis display
(No. 409) as shown below.
#7
409
#6 #5 #4 #3
SPE
#2
S2E
#1
S1E
#0
SHE
#3 (SPE) 0 : In the spindle serial control, the serial spindle parameters fulfill the
spindle unit startup conditions.
D The details of spindle
alarm No.750