308
Soft Phase Alarm (SPHAL)
Fanuc · αi series AC Servo Motor
What does 308 mean?
A soft phase alarm (SPHAL) was detected. This type of alarm often points to issues with the motor's phase current detection or can be triggered by external electrical noise affecting the control signals.
Common Causes
- Electrical noise interfering with phase detection.
- Potential issues with motor phase current sensing.
Repair Steps
- 1
Turn the main power OFF.
- 2
Implement noise reduction measures as described in the relevant documentation.
Verified technical data. Last updated: March 2026
Source: Fanuc αi series AC Servo Motor