B–63503EN–1/01
9. SPINDLE SPEED FUNCTION
355
Number Message Description
749
S–SPINDLE LSI ERROR A communication error occurred for the serial
spindle. The cause may be noises, discon-
nection of an optical cable or the interruption
of the power to the spindle amplifier.
(Note) Unlike alarm No. 750, this alarm oc-
curs when a serial communication alarm is
detected after the spindle amplifier is normal-
ly activated.
750
SPINDLE SERIAL LINK
ERROR
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 fol-
lows:
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 dis-
play 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)
4) The second spindle (when SP2, bit 4 of
parameter No. 3701, is 1) is in one of the
above conditions 1) to 3).
Note) This alarm does not occur after the
system including the spindle control
unit is activated.
See diagnostic display No. 409 for details.
751
SPINDLE–1 ALARM DETECT
(AL–XX)
This alarm indicates the NC that an alarm is
generated in the spindle control unit of the se-
rial spindle. The alarm is displayed in form
AL–XX (XX is a number). Refer to the manu-
als for serial spindle. The alarm number XX
is the number indicated on the spindle ampli-
fier. The CNC holds this number and displays
on the screen.
752
SPINDLE–1 MODE CHANGE
ERROR
This alarm is generated if the system does
not properly terminate a mode change. The
modes include the Cs contouring, 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 CNC.
761
SPINDLE–2 ALARM DETEC-
TION (AL–XX)
Refer to alarm No. 751. (For 2nd spindle)
762
SPINDLE–2 MODE CHANGE
ERROR
Refer to alarm No. 752.(For 2nd spindle)
Alarm and message