Fanuc alarm OT0501: - OVERTRAVEL (SOFT 1)
overtravel alarm (OT) · Fanuc 0i-D
What it means
The axis moved beyond the negative-side boundary of stored stroke check 1, the primary software travel limit defined by parameter No. 1320/1321. Jog the axis back inside the envelope and reset. If trips occur at legitimate positions, review work offsets, coordinate system shifts, and whether the limit values were set conservatively after a reference-return rebuild.
Likely causes
- Programmed move or manual jog past soft limit
- Incorrect workpiece offset shifting effective coordinates
- Reference return performed incorrectly, displacing machine coordinates
- Stroke limit parameters set too tight
Need the part urgently?
Send us alarm OT0501 with your machine details — typical RFQ turnaround is 24–48h.