
8. ALARM LIST
505
8.1.10 Rigid tapping alarms
No. Message Contents
740 RIGID TAP ALARM:
EXCESS ERROR
The positional deviation of the stopped spindle
has exceeded the set value during rigid tapping.
(PRM5313 etc.)
741 RIGID TAP ALARM:
EXCESS ERROR
The positional deviation of the moving spindle
has exceeded the set value during rigid tapping.
(PRM5311, etc.)
Alternatively, a rigid tapping synchronization er-
ror exceeding the setting occurred. (PRM5214,
etc.)
742 RIGID TAP ALARM:
LSI OVERFLOW
An LSI overflow has occurred for the spindle dur-
ing rigid tapping.
8.1.11 Serial spindle alarms
No. Message Contents
749 S–SPINDLE LSI
ERROR
It is serial communication error while system is
executing after power supply on. Following rea-
sons 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.
4) The spindle amplifier is under an abnormal
condition. (The SPM indication is A, A1, A2,
or the like, depending on the type of the ab-
normality.)
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.
If the spindle amplifier is under an abnormal
condition, check the SPM indication (A, A1, A2,
or the like). Then, refer to the FANUC SERVO
MOTOR ai series MAINTENANCE MANUAL
(B–65285EN) or FANUC SERVO MOTOR a se-
ries MAINTENANCE MANUAL (B–65165E) to
solve the problem.
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 or fourth spindle is in one of the
above conditions 1) to 3).
See DGN409 and 413 for details.