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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 → · Le diagnostic IA qui lit la sauvegarde de votre robot, sans rien téléverser.

ABB Error 34203 — Motor / Drive Unit fault

Error / Erreur

🇫🇷 Moteur / Drive Unit

ENTRAÎNEMENT : REDRESSEUR, DC-LINK, BLEEDER, ENERGY BANK (34xxx, 36xxx, 386xx S4C+)

ABB 34203 (“Motor / Drive Unit fault”): Motor / Drive Unit fault — ABB robot hardware event on the motor / Drive Unit (IRC5). Likely part: Moteur / Drive Unit (motor / Drive Unit).

Updated 2026-08-29 · LogrobotLM reference

What it means · Ce que ça veut dire

Motor / Drive Unit fault — ABB robot hardware event on the motor / Drive Unit (IRC5). Seen across controller generations. Severity: Critical. Field diagnosis below (French); your robot's own manual remains authoritative.

Courant moteur trop élevé sur un joint.

What to check · Que vérifier

  • Inspect the motor / Drive Unit, its wiring and connections first.
  • Match this code against your robot's event-log timeline before swapping parts.
  • Follow the French field checks below — they are the tested sequence for this fault.
  • Contrôler configuration moteur, charge/point dur ou collision, dimensionnement moteur-drive, court-circuit phase-phase/phase-terre et résistance du moteur/câble hors tension.
  • À savoir : À distinguer de 34316 : 34203 indique un courant moteur excessif; 34316 concerne une déviation de courant de couple.

Part to check / replace · Pièce à contrôler / remplacer

ABB 34203 points to the hardware below — start here before ordering. · 34203 met en cause l'organe ci-dessous : commencez par là.

Tap a part for every code that points to it — and verify the exact variant for your controller before ordering. · Touchez une pièce pour tous les codes qui la citent ; vérifiez la variante exacte avant commande.

Frequently asked · Questions fréquentes

What does ABB error 34203 mean?
ABB 34203 (“Motor / Drive Unit fault”): Motor / Drive Unit fault — ABB robot hardware event on the motor / Drive Unit (IRC5). Seen across controller generations. Severity: Critical. Field diagnosis below (French); your robot's own manual remains authoritative.
How do you troubleshoot ABB error 34203?
Inspect the motor / Drive Unit, its wiring and connections first. Match this code against your robot's event-log timeline before swapping parts. Follow the French field checks below — they are the tested sequence for this fault.
Which part is involved in ABB 34203?
34203 points to Moteur / Drive Unit (motor / Drive Unit). Confirm the real cause against the robot backup before replacing a part.

Related codes / Codes liés

34100Drive system fault34200Axis Computer / Drive Units fault34201Drive Unit fault

Same hardware involved / Même matériel en cause

34317Moteur / Drive Unit

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. · Informations indicatives issues du terrain — le manuel du constructeur et ses procédures de sécurité font foi. Ne shuntez jamais un organe de sécurité ; consignez (LOTO) avant toute intervention physique. How this reference is built →