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.
Quick facts
- Category
- Servo
- Affected series
- R-30iB; R-30iB Mate; R-30iB Plus; R-30iB Mate Plus
- Alarm family
- SRVO
Related codes
- SRVO-130OHAL1 (PS) alarm (power supply overheat)
- SRVO-133FSAL (PS) alarm (power supply fan stopped)
- SRVO-134DCLVAL / DCLVAL (PS) alarm (DC link voltage low)
- SRVO-135FSAL alarm (aux amplifier fan stopped)
- SRVO-126Quick stop error
- SRVO-124Check HardStop if Hit
- SRVO-122Bad last ang (internal)
- SRVO-121Excessive acc/dec time