3.TROUBLESHOOTING AND ACTION TROUBLESHOOTING B-65285EN/03
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3.4.15 Alarm Code 31
The motor failed to rotate as specified, and has stopped or is rotating at
a very low speed.
(1) If the motor rotates at a very low speed and this alarm is issued
(a) The setting of a parameter is incorrect.
Referring to "FANUC AC SPINDLE MOTOR αi series
Parameter Manual (B-65280EN)," check the parameter for
(b) The motor phase sequence is incorrect.
Check if the motor phase sequence is correct.
(c) The feedback cable of the motor has a problem.
Check if the phase A/B signals are connected correctly.
(d) The feedback cable of the motor is faulty.
Rotate the motor manually to see if a speed is indicated in the
item of motor speed on the CNC diagnosis screen or on the
spindle check board. If no speed indication is provided,
replace the cable or spindle sensor (or motor).
(2) If the motor does not rotate at all and this alarm is issued
(a) The sequence for locking the spindle is incorrect.
Check the sequence to see if the spindle is locked.
(b) The power lead is faulty.
Check if the power lead is connected to the motor correctly.
If spindle switching or winding switching is performed,
check if the magnetic contactor is on.
(c) The SPM is faulty.
Replace the SPM.
3.4.16 Alarm Code 32
LSI memory for serial communication is abnormal. A check is made
when the power is turned on.
If this alarm is issued, replace the SPM or SPM control printed circuit
3.4.17 Alarm Code 34
Parameter data outside the specifiable range was set.
Troubleshooting when this alarm is issued
Connect the spindle check board.
The spindle check board displays "AL-34" and "F-xxx"
alternately. "F-xxx" indicates a parameter number outside the
specifiable range. For the correspondence between the CNC
parameter numbers and "F-xxx," refer to "FANUC AC SPINDLE
MOTOR αi series Parameter Manual (B-65280EN)."