ABB Error 34251 — Rectifier / power supply three-phase fault
Error / Erreur🇫🇷 Redresseur / Alimentation triphasée
ENTRAÎNEMENT : REDRESSEUR, DC-LINK, BLEEDER, ENERGY BANK (34xxx, 36xxx, 386xx S4C+)
ABB 34251 (“Rectifier / power supply three-phase fault”): Rectifier / power supply three-phase fault — ABB robot hardware event on the rectifier / power supply three-phase (IRC5). Likely part: Redresseur / Alimentation triphasée (rectifier / power supply three-phase).
Updated 2026-08-29 · LogrobotLM reference
What it means · Ce que ça veut dire
Rectifier / power supply three-phase fault — ABB robot hardware event on the rectifier / power supply three-phase (IRC5). Seen across controller generations. Severity: Critical. Field diagnosis below (French); your robot's own manual remains authoritative.
Perte d’une phase secteur détectée par le redresseur.
What to check · Que vérifier
- Inspect the rectifier / power supply three-phase, 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.
- Mesurer les trois phases en amont, contrôler interrupteur principal, filtre secteur, fusibles, contacteurs, câblage triphasé et redresseur.
- À savoir : Erreur physique d’alimentation; peut provoquer ensuite des défauts DC-link et drive.
Part to check / replace · Pièce à contrôler / remplacer
ABB 34251 points to the hardware below — start here before ordering. · 34251 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 34251 mean?
- ABB 34251 (“Rectifier / power supply three-phase fault”): Rectifier / power supply three-phase fault — ABB robot hardware event on the rectifier / power supply three-phase (IRC5). Seen across controller generations. Severity: Critical. Field diagnosis below (French); your robot's own manual remains authoritative.
- How do you troubleshoot ABB error 34251?
- Inspect the rectifier / power supply three-phase, 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 34251?
- 34251 points to Redresseur / Alimentation triphasée (rectifier / power supply three-phase). Confirm the real cause against the robot backup before replacing a part.
Related codes / Codes liés
Same hardware involved / Même matériel en cause
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 →