ABB Error 20478 — SC arg Main Supply

What it means · Ce que ça veut dire

SC arg Main Supply — ABB robot hardware event on the SC arg Main Supply (IRC5). Specific to this controller generation. Severity: Major. Field diagnosis below (French); your robot's own manual remains authoritative.

The main power supply voltage for Safety Controller (SC) arg is out of range. Le texte constructeur de ce code n'existe qu'en anglais dans les manuels ABB dont il provient. Il est reproduit tel quel ci-dessus ; le manuel de votre robot fait foi.

What to check · Que vérifier

• Inspect the SC arg Main Supply, 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.
• probable : Either the voltage is out of specification or the voltage is missing.
• Check Safety Controller cabling.
• Check voltage from power supply.
• Warm start controller.

Frequently asked · Questions fréquentes

What does ABB error 20478 mean?

ABB 20478 (“SC arg Main Supply”): SC arg Main Supply — ABB robot hardware event on the SC arg Main Supply (IRC5). Specific to this controller generation. Severity: Major. Field diagnosis below (French); your robot's own manual remains authoritative.

How do you troubleshoot ABB error 20478?

Inspect the SC arg Main Supply, 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.

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