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ABB Error 50441 — SMB battery (axis) fault

Error

ABB 50441 (“SMB battery (axis) fault”): Axis SMB backup battery voltage too low (warning threshold active). Likely part: SMB battery (axis) (SMB battery (axis)).

Updated 2026-10-22 · LogrobotLM reference

What it means

Axis SMB backup battery voltage too low (warning threshold active).

What to check

  • Leave the cabinet powered on and replace the robot's SMB backup battery.
  • Note: Equivalent to the low axis backup battery faults of the S4 and S2/S3 era.

Part to check / replace

ABB 50441 points to the hardware below — start here before ordering.

Tap a part for every code that points to it — and verify the exact variant for your controller before ordering.

Related codes

50021Axis servo control / Feedback / Mechanics fault50052Joint speed too high50055Joint load high

Same hardware involved

38200SMB battery (axis)38213SMB battery (axis)38214SMB battery (axis)38215SMB battery (axis)

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 →