Fanuc AC Spindle Unit Alarms and Error Codes

Fanuc AC Spindle Unit Alarms. These Fanuc AC Spindle unit alarms and fault/error coders cover series A06B-6044, A06B-6052, A06B-6055 and other early AC spindle servo units.

Please contact us if you need testing, a repair or an exchange part. For further information please visit our dedicated Fanuc AC Spindle Page.

IMPORTANT: 6044 & 6052 series spindle amplifiers ALARM via LED’s on the control PCB with digits 1, 2, 4, 8 next to the LED’s themselves. On the 6055 control pcb’s similar to later AC spindle drives i.e. S, I and Serial; it displays alarms on a 5 * 7 segment LED strip.

Alarm CodeDescription of Alarm/Error
1Motor is overheated ( theromostat operates)
2Speed is deviated from the command value due to overload and other.
3Fuse 7 in DC link is blown out.
4Fuses F1, F2, or F3 in AC input circuit are blown out.
5Fuse AF2 or AF3 on PCB is blown out.
6The motor speed exceeds the maximum rated speed( analog system detection).
7The motor speed exceeds the maximum rated speed( digital system detection)
8Power voltage ( +24V is higher than specified.
9Radiator for power semiconductors is overheated.
10+15V power voltage is abnormally low.
11DC link voltage is abnormally high.
12DC link current is flowing excessively.
13CPU and peripheral parts are defective.
14ROM is defective.
15Option circuit is in trouble.
16CPU defective.
17NVRam issues.