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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.

E

Input Power Supply Open Phase (α i PS, α i PSR)

Fanuc · Series 30i/31i/32i-MODEL B Plus

What does E mean?

This alarm indicates an abnormal input power supply condition, specifically an open phase, for the α i PS or α i PSR unit. An open phase can lead to motor damage or operational instability.

Common Causes

  • Open phase condition in the input power supply.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the power supply voltage for an open phase condition.

  2. 2

    If there is no problem with the power supply voltage, check the input power supply connections.

Browse all codes in this manual (38)
Verified technical data. Last updated: April 2026

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Source: Fanuc Series 30i/31i/32i-MODEL B Plus
Open Manual (Page 91)Search more codes in this manual