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KUKA Error 1228 — KPS600 / ballast resistor

Info

Displayed as KSS01228 on KRC4 / KRC5 controllers

KUKA 1228 (“KPS600 / ballast resistor”): The brake chopper remained switched on for too long (I²t of the braking resistor exceeded): excessive braking energy, ballast resistor out of tolerance, or defective ballast stage of the KPS600 that remains conducting. Likely part: KPS600 (KUKA Power Supply 600 — supply & brake ballast).

Updated 2026-09-09 · LogrobotLM reference

Cause

The brake chopper remained switched on for too long (I²t of the braking resistor exceeded): excessive braking energy, ballast resistor out of tolerance, or defective ballast stage of the KPS600 that remains conducting.

Part to check / replace

KUKA 1228 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.

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 →