
B--63003EN--1/02
9. SPINDLE SPEED FUNCTION
888
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. The spindle for which this error occurred can be determined from
diagnosis No. 408 (the first or second spindle) and diagnosis No. 438
(the third spindle).
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 systemwith the seri-
al spindle.
The four reasons can be considered as follows:
1) Noise, An improperly connected optic cable, or the spindle c ontrol
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)
4) The second spindle (when SS2, bit 4 of parameter No. 3701, is 1)
or the third spindle (when SS3, bit 5 of parameter No. 3701, is 1) is
in one of the above conditions 1) to 3).
This alarm does not occurafterthe system including the spindlecon-
trol unit is activated.
See diagnostic d isplay No. 409 (the first or s econd spindle) or No. 439
(the third spindle) for details.
771 SPINDLE--3 ALARM DETECT
(AL--XX)
This alarm indicates in the NC that an alarm is generated in the third
spindle unit of the system with the third serial spindle. The alarm is dis-
played in form AL --XX (XX is a number). Refer to (11) Alarms dis-
played on third spindle servo unit .The alarm number XX is the num-
ber indicated on the third spindle amplifier. The CNC holds this number
and displays on the screen.
772 SPINDLE--3 MODE CHANGE
ERROR
This alarm is generated if the system does not properly terminate a
mode change. The modes include rigid tapping, and spindle control
modes. The alarm is activated if the spindle control unit does not re-
spond correctly to the mode change command issued by the NC.
774 SPINDLE--3 ABNORMAL TORQUE
ALM
An abnormal load on the first spindle motor was detected.
The alarm can be released by a reset.
Alarm and message