Robotics in Manufacturing
SRVO-127

SRVO-127: Unsupported power supply software

The controller detected power supply software it doesn't support - a software/version mismatch at the power-supply level, which is FANUC-service territory.

What it means

The controller detected power supply software it doesn't support - a software/version mismatch at the power-supply level, which is FANUC-service territory.

Common causes

Ranked by what technicians most often find, most likely first.

  1. Unsupported or mismatched power supply software loaded - typically after board/software changes.

How to fix it

  1. Diagnostic Log immediately, image backup, contact FANUC. Power-cycle required to clear, but expect the underlying mismatch to need FANUC's involvement.

Quick facts

Category
System
Affected series
R-30iB; R-30iB Mate; R-30iB Plus; R-30iB Mate Plus
Alarm family
SRVO

Verified against FANUC documentation (B-83284EN-1).Last reviewed: 2026-07-09.Editorial process