ABB Error 39434 — Drive units fault
ErrorABB 39434 (“Drive units fault”): Hardware start-up failure of the drive unit (DSP or bootloader fault). Likely part: Drive units (Drive units).
Updated 2026-10-22 · LogrobotLM reference
What it means
Hardware start-up failure of the drive unit (DSP or bootloader fault).
What to check
- Switch off the cabinet main power supply, wait for complete discharge and switch back on.
- Note: Drive axis boot fault.
Part to check / replace
ABB 39434 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
Same hardware involved
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 →