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