FANUC Alarm SRVO-300 — SERVO Hand broken/HBK disabled
Error- Hardware
- robot signals and connection cable
- Controllers
- R-J3iB / R-30iA / R-30iB
- FANUC class
- SERVO
- Hardware family
- FANUC brake, fuse, robot signal and position error alarms
FANUC SRVO-300 (“SERVO Hand broken/HBK disabled”): A safety hand broken is detected when setting of HBK is disabled. First check: Press reset key to clear alarm.
Updated 2026-10-22 · LogrobotLM reference
Description
A safety hand broken is detected when setting of HBK is disabled. The most likely is the HBK signal of a robot connection cable being from 24V to the 0 V level.
Remedy
Press reset key to clear alarm. Verify whether robot has hand broken equipment or not. If it doesn't have, HBK signal status is changed
Field diagnosis
A hand breakage signal was detected while the function is disabled in the configuration.
What to check
- Reset.
- If a hand breakage circuit is actually connected to the robot, enable the function; otherwise find out why the signal is switching (cable, end-effector connector).
- Note: Warns of a configuration/wiring inconsistency, not of a breakage.
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 →