Fanuc alarm SV0411: EXCESS ERROR (MOVING)
αi/βi Servo (SV0xxx) · Fanuc 0i-D
What it means
During travel, the amount of positional deviation exceeded the parameter No. 1828 limit — the axis lagged its command beyond tolerance. Classic causes split into mechanical (crash residue, binding, seized bearing, failed brake) and electrical (power line short/open phase, weak amplifier, motor winding faults). Compare actual current load (diagnostics IR/IS) against rated values to separate mechanical drag from drive weakness.
Likely causes
- Collision or crash leaving mechanical binding
- Motor power cable open phase, short, or loose connection
- Brake stuck engaged on vertical axis
- Servo amplifier output stage degradation
- Feedrate commanded beyond system capability
Need the part urgently?
Send us alarm SV0411 with your machine details — typical RFQ turnaround is 24–48h.