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FANUC Alarm SRVO-450 — Drvoff circuit fail

Error
Hardware
servo amplifier
Controllers
R-30iB (this generation only)
FANUC class
SERVO (default, not tabulated in the sources)
Hardware family
FANUC servo amplifier alarms: power, DC link, currents and IPM

FANUC SRVO-450 (“Drvoff circuit fail”): The two drive off inputs of the amplifier are not in the same state.

Updated 2026-10-22 · LogrobotLM reference

What it means

The two drive off inputs of the amplifier are not in the same state.

What to check

  • Check both input lines and the seating of the signal connector (CRMB16) on the amplifier; replace the amplifier if the wiring is sound.
  • Note: R-30iB code only (serial bus amplifier architecture).

Related codes

SRVO-451Internal S-BUS failSRVO-348DCS MCC OFF alarm …,…SRVO-349DCS MCC ON alarm …,…SRVO-417DCS APSP_C alarm …,…SRVO-418DCS APSP_J alarm …,…SRVO-452ROM data failure

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 →