SRVO-131: LVAL / LVAL (PS) alarm (PS control voltage low)
The control supply voltage inside the servo power supply (αiPS) is abnormally low - the power supply's own electronics are underfed.
What it means
The control supply voltage inside the servo power supply (αiPS) is abnormally low - the power supply's own electronics are underfed. Posts per amplifier. Hardware ladder, no configuration fix.
Common causes
Ranked by what technicians most often find, most likely first.
- Failed power supply (αiPS).
- Failed 6-axis amplifier.
- Failed power supply unit.
How to fix it
- Replace in FANUC's order: αiPS power supply, then the 6-axis amplifier, then the power supply unit. Power-cycle to clear between attempts.