A. ALARM LIST
9) 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 cable or the interruption of the power to the
spindle amplifier. See Chapter 7.
(Note) Unlike spindle alarm No. 750, this alarm occurs when a serial
communication alarm is detected after the spindle amplifier is
750 SPINDLE SERIAL LINK START
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
The four reasons can be considered as follows:
1) Defective cable, poor connection, or spindle amplifier being
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
3) Other reasons (improper combination of hardware)
This alarm does not occur after the system including the spindle
control unit is activated.
See diagnostic display No. 409 for details. See Chapter 7.
751 SPINDLE ALARM DETECTION
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 (12) Alarms displayed on spindle
servo unit .The alarm number XX is the number indicated on the
spindle amplifier. The CNC holds this number and displays on the
752 SPINDLE MODE CHANGE FAULT This alarm is generated if the system does not properly terminate a
mode change. The modes include the 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 ABNORMAL TORQUE
An abnormal load on the spindle motor was detected.
The details of spindle alarm No. 750 are displayed in the diagnosis display
(No. 409) as shown below.
#6 #5 #4 #3
SHE 0 : The serial communications control unit in the Power Mate i is normal.
1 : The serial communications control unit in the Power Mate i was
detected to have a fault.
S1E 0 : The spindle is normal during the spindle serial control startup.
1 : The spindle was detected to have a fault during the spindle axis serial
SPE 0 : In the spindle serial control, the serial spindle parameters fulfill the
spindle unit startup conditions.
1 : In the spindle serial control, the serial spindle parameters do not fulfill
the spindle unit startup conditions.
D The details of spindle