FANUC Alarm SRVO-456 — Ground fault
Error- Hardware
- servo amplifier
- Controllers
- R-30iB (this generation only)
- FANUC class
- SERVO (default, not tabulated in the sources)
FANUC SRVO-456 (“Ground fault”): The motor current measurement data indicates a leakage to ground.
Updated 2026-10-22 · LogrobotLM reference
What it means
The motor current measurement data indicates a leakage to ground.
What to check
- Before replacing the amplifier, measure the insulation of the motor and of the axis power cables: a real leakage would destroy the new amplifier.
- Note: R-30iB code only; same trap as SRVO-045.
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 →