SV0478
ILLEGAL AXIS DATA (SV)
Fanuc · Alpha i Series Servo Amplifier
What does SV0478 mean?
The servo detected an error during axis data transfer. This can occur after setting axis numbers for the servo amplifier, indicating a configuration mismatch, or it might point to an internal amplifier issue requiring replacement.
Common Causes
- Invalid or corrupt axis configuration data in the servo controller.
- Incorrect motor tuning parameters or encoder resolution settings.
- Parameter P1-78 (axis type) set incorrectly.
- Data mismatch between the master controller and servo drive.
Repair Steps & Checklist
Click steps to track your progress.
- 1
If the alarm occurred after performing axis number setting for the servo amplifier, set parameter No.2212#4 to 1.
- 2
Reset parameter No.2212#4 to 0.
- 3
Turn off the power to the entire system.
- 4
If the alarm occurred for any other reason or persists after parameter adjustment, replace the servo amplifier.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fanuc Alpha i Series Servo Amplifier