LogrobotLM — AI fault diagnosis for ABB · KUKA · FANUC robots. It reads your robot backup in your browser (never uploaded) and pinpoints the fault. Try it free →

FANUC Alarm ARC-154 — STOP Invalid Arc Loss Time(E:…)

Manufacturer wording — STOP Invalid Arc Loss Time(E:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC ARC-154 (“STOP Invalid Arc Loss Time(E:…)”): Arc loss time is invalid range. First check: Set proper arc loss time.

Updated 2026-09-17 · LogrobotLM reference

Description

Arc loss time is invalid range.

Remedy

Set proper arc loss time.

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 →