
APPENDIXA. ALARM LIST
B--63005EN/02
702
(8) Overheat alarms
Number Message Contents
700 OVERHEAT: CONTROL UNIT Control unit overheat
Check that the fan motor operates normally, and clean the air filter.
701 OVERHEAT: FAN MOTOR The fan motor on the top of the cabinet forthe contorl unit is overheated.
Check the operation of the fan motorand replace the motor if necessary.
704 OVERHEAT: SPINDLE Spindle overheat in the spindle fluctuation detection
(1) If the cutting load is heavy, relieve the cutting condition.
(2) Check whether the cutting tool is share.
(3) Another possible cause is a faulty spindle amp.
(9) Rigid tapping alarms
Number Message Contents
740 RIGID TAP ALARM: EXCESS ER-
ROR
The positional deviation of the stopped spindle has exceeded the set
value during rigid tapping.
741 RIGID TAP ALARM: EXCESS ER-
ROR
The positional deviation of the moving spindle has exceeded the setval-
ue during rigid tapping.
742 RIGID TAP ALARM: LSI OVER-
FLOW
An LSI overflow has occurred for the spindle during rigid tapping.
(10)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
FAUL T
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 occurafter the system includingthe 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
FAUL T
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.