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ABB Error 39424 — Drive unit internal error

Error

ABB 39424 (“Drive unit internal error”): Drive unit internal error: the drive unit in the drive module reports an internal error, accompanied by a Supervision Code. Likely part: Drive unit / control cable / DC link.

Updated 2026-10-22 · LogrobotLM reference

What it means

Drive unit internal error: the drive unit in the drive module reports an internal error, accompanied by a Supervision Code. The system goes to SYS HALT and no operation is possible until it is corrected.

What to check

  • Note the Supervision Code before any restart: it is lost on acknowledgement.
  • Check the connection to the drive unit and that the installed hardware matches the configuration (drive unit part number).
  • Check the control cable, the DC link connection (busbar or cable) and their tightness.
  • If everything is compliant, the internal electronics of the drive unit are at fault: replace the unit.
  • Note: Core of the "internal errors" family in the drive domain. A drive unit fitted that does not match the configuration produces the same error as an electronic failure: check the part number before concluding.

Part to check / replace

ABB 39424 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

32540Drive unit / firmware fault32541Drive unit / firmware fault39008Drive units fault

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 →