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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

308

Soft Phase Alarm (SPHAL)

Fanuc · Alpha i 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 & Checklist

Click steps to track your progress.

  1. 1

    Turn the main power OFF.

  2. 2

    Implement noise reduction measures as described in the relevant documentation.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

000Power-Down Required Parameter011Zero Feedrate Specified013Maximum Feedrate Zero
Source: Fanuc Alpha i series AC Servo Motor
Open Manual (Page 224)Search more codes in this manual