LogrobotLM

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 SRVO-107 — SERVO Ext brake abnormal(Rbt:…)

Manufacturer wording — SERVO Ext brake abnormal(Rbt:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC SRVO-107 (“SERVO Ext brake abnormal(Rbt:…)”): The FET current for brake of an extended axis (brake number 2 or greater) exceeded the specification. First check: Check the brake for zero or abnormally low impedance.

Updated 2026-09-17 · LogrobotLM reference

Description

The FET current for brake of an extended axis (brake number 2 or greater) exceeded the specification.

Remedy

Check the brake for zero or abnormally low impedance. Then check the brake cable. Then check 200VAC. Then check the servo amplifier or emergency stop control PCB if brake ports are used.

Related codes

SRVO-105SERVO Door open or E.StopSRVO-106SERVO Door open/E.Stop(Robot:…)SRVO-108SERVO Press RESET to enable robotSRVO-111SERVO Softfloat time out

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 →