
APPENDIX
B–62835EN/01
B. ALARM LIST
371
6) Over travel alarms
If this alarm occurs, move the machine manually in the direction opposite to that in which it was moving when
the alarm occurred, then reset the alarm.
Number Message Contents
500 OVER TRAVEL : +n Exceeded the n–th axis (axis 1–2) + side stored stroke limit I.
(Parameter No.1320)
501 OVER TRAVEL : –n Exceeded the n–th axis (axis 1–2) – side stored stroke limit I.
(Parameter No.1321)
7) 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 contorl unit is overheated. Check the
operation of the fan motor and replace the motor if necessary.
8) Spindle alarms
Number Message Contents
749 S–SPINDLE LSI ERROR A communication error occurred for the serial spindle. The cause may
be the disconnection of an optical cable or the interruption of the power
to the spindle amplifier.
(Note) Unlike alarm No. 750, this alarm occurs when a serial commu-
nication alarm is detected after the spindle amplifier is normally acti-
vated.
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
control 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.
For serial spindle operation, the position coder should be connected
to the serial spindle amplifier. Determine whether it has been con-
nected to the JA12 connector of the Power Mate by mistake.
751 FIRST SPINDLE ALARM DETEC-
TION (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). Refer to Sec.9.1.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 spindle positioning, 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
An abnormal spindle motor load was detected.