Alarm: Fanuc Lkg

The is intimidating, but it is almost always a memory checksum error —not a mechanical failure. In 80% of cases, the root cause is a dead backup battery. The solution involves a careful clearing procedure followed by a full data restore.

If you (or a technician) attempted to load a full SRAM backup file (e.g., via RS-232 or PCMCIA) that contained corrupted K-relay data, or if the upload was interrupted, the LKG alarm can appear immediately after the upload finishes. fanuc lkg alarm