LOGIC_SUPPLY_LOW_5V
Logic Supply Less Than 5V
Fanuc · αi 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
- 1
Turn the power off, then back on
- 2
If this alarm recurs, replace the servo amplifier module
Verified technical data. Last updated: March 2026
Source: Fanuc αi series AC Servo Motor