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Y-axis Excess error and tack generator alarm on a Fanuc O-M control

The alarm was on Y-axis. After staying powered on for about 10minutes machine not even running a Y-axis Excess error and tack generator alarm on a Fanuc O-M control would occur. The drive also showed these LED alarms on them though after testing several times. somtimes only one oe the other LED would be on.

Checked all connections. Looked for maybe a heat problem. Left the cabinet doors open checked fans and connections.

CNC problem resolution

The  X-axis drive and Y-axis drive were the same so I swapped the encoder feedback cables and motor leads. Problem stayed with drive. I then swapped just the top board on the two drives and found that the problem went with the board. Ordered up a top board for about $3000 and replaced. Problems were gone.