FANUC Alarm SRVO-459 — Excess regeneration2…
Error- Hardware
- servo amplifier
- Controllers
- R-30iB (this generation only)
- FANUC class
- SERVO (default, not tabulated in the sources)
Manufacturer wording — Excess regeneration2%s
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC SRVO-459 (“Excess regeneration2…”): Error detected in the amplifier discharge circuit.
Updated 2026-10-22 · LogrobotLM reference
What it means
Error detected in the amplifier discharge circuit.
What to check
- Replace the amplifier; first check the external discharge resistor if the installation has one.
- Note: R-30iB code only; not to be confused with SRVO-043 (excessive energy, not a failed circuit).
Related codes
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 →