Fanuc AC Spindle Servo Unit Alarm codes, Fanuc Spindle Fault codes. Services offered on this A06B-6044 drive include our test and fanuc repair service or service exchange. All Fanuc spindle drives.

If you have more than one red lit you add the corresponding numbers up So a red led below the 4 and 8 would give you an alarm 12.

The alarms help us identify if you have a fault with the top card, whole drive (or base)  or elsewhere like the fanuc spindle motor the fault is displayed on the four red LEDs on the spindle card, Usually a part number of A20B-0009-053x or A20B-1000-069x note x can be 0 to 9 though in a lot of cases then last digit will have worn of. 

Alarm 01 (AL-01) Motor Overheat
Causes
Damaged motor fan, overload, motor cooler is dirty, loose connection.
Remedy
Replace parts, clean cooler, check connections, review cutting conditions.

Alarm 02 (AL-02) Excessive Speed Deviation
Causes
Loose connections, Error with speed feedback signal, blown fuse.
Remedy
Replace parts, check connections, review cutting conditions.

Alarm 03 (AL-03) Blown Fuse in DC Link Section
Causes
Indicates that the fuse F7 in DC link is blown
Remedy
Check power transistors and replace the fuse.

Alarm 04 (AL-04) Input fuse blown / Input power open phase
Causes
Defective transistor module, blown fuse.
Remedy
Replace parts, replace the fuse.

Alarm 05 (AL-05) Control Fanuc Power Supply Fuse Blown. AF2 or AF3
Causes
Defective PCB, Abnormal power supply voltage.
Remedy
Check power supply, replace Fanuc Board, replace the fuse.

Alarm 07 (AL-07) Excessive Speed
Causes
Incorrect parameter setting.
Remedy
Reset parameter value.

Alarm 08 (AL-08) High Input Voltage
Causes
AC power supply too high, incorrect setting of the toggle switch for voltage setting.
Remedy
Change the setting from 200V to 230V.

Alarm 09 (AL-09) Heat sink is overheated
Causes
The cooling fan is defective, overload, dust and dirty.
Remedy
Replace fan, review cutting conditions, clean parts.

Alarm 10 (AL-10) +15V power voltage is low
Causes
Drop in input power, momentary power failure.
Remedy
Correct case and reset the alarm.

Alarms 11 (AL-11) Overvoltage of DC Link Circuit
Causes
High power impedance, PCB or transistor module are defective.
Remedy
Check AC power, replace damaged Fanuc part.

Alarm 12 (AL-12) Overcurrent flows to DC Link Circuit
Causes
Output terminals or internal motor of the motor is shorted, defective PCB or transistor module.
Remedy
Check connections, replace damaged parts.

Alarm 13 (AL-13) CPU Inter Data Memory Alarm
Replace PCB

Alarm 14 (AL-14) ROM Is Defective
Cause
ROM is not mounted, not mounted correctly or fault
Remedy
Check EPROM.