FANUC Alarm SRVO-131 — SERVO LVAL(PSM) alarm
Error- Hardware
- servo amplifier
- Controllers
- R-J3iB / R-30iA
- FANUC class
- SERVO
Manufacturer wording — SERVO LVAL(PSM) alarm(G:%d A:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC SRVO-131 (“SERVO LVAL(PSM) alarm”): The DC voltage on the main power circuit of the servo amplifier is lower than the specification, even though MCC is on. First check: Refer to the maintenance manual.
Updated 2026-10-22 · LogrobotLM reference
Description
The DC voltage on the main power circuit of the servo amplifier is lower than the specification, even though MCC is on.
Remedy
Refer to the maintenance manual.
Field diagnosis
The control voltage delivered by the power supply module is abnormally low.
What to check
- Measure the mains input, then replace the power supply module.
- Note: Equivalent of SRVO-047 on the PSM side.
Related codes
Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →