FANUC Alarm PAIN-420 — WARN …Max. output has speed < setpoint
Manufacturer wording — WARN %sMax. output has speed < setpoint
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC PAIN-420 (“WARN …Max. output has speed < setpoint”): The requested Bell Speed setpoint could not be reached with the control output at the maximum command. First check: Check the turbine lines for pinching, especially at places where they flex. Likely part: Transducer (Transducer).
Updated 2026-09-17 · LogrobotLM reference
Description
The requested Bell Speed setpoint could not be reached with the control output at the maximum command. The Bell might be clogging, the turbine air or turbine pilot air line might be pinched, or the turbine air pressure might have become too low.
Remedy
Check the turbine lines for pinching, especially at places where they flex. Also check the turbine air supply pressure. Then, check and replace the I/P transducer if necessary.
Part to check / replace
FANUC PAIN-420 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 →