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ErrorLib — Industrial Fault Code Library

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LOGIC_SUPPLY_LOW_5V

Logic Supply Less Than 5V

Fanuc · Alpha i series AC Servo Motor

What does LOGIC_SUPPLY_LOW_5V mean?

The logic supply voltage was detected as being less than 5V. This critical low voltage can prevent proper operation of the control circuitry, leading to system shutdown or unpredictable behavior.

Common Causes

  • Logic supply voltage dropped below 5V due to internal fault or power supply issue

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn the power off, then back on

  2. 2

    If this alarm recurs, replace the servo amplifier module

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 231)Search more codes in this manual