LogrobotLM

LogrobotLM — AI fault diagnosis for ABB · KUKA · FANUC robots. It reads your robot backup in your browser (never uploaded) and pinpoints the fault. Try it free → · Le diagnostic IA qui lit la sauvegarde de votre robot, sans rien téléverser.

FANUC Alarm PAIN-420 — WARN %sMax. output has speed < setpoint

FANUC PAIN-420 (“WARN %sMax. 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 2026-08-29 · 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 · Remède

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 · Pièce à contrôler / remplacer

FANUC PAIN-420 points to the hardware below — start here before ordering. · PAIN-420 met en cause l'organe ci-dessous : commencez par là.

Tap a part for every code that points to it — and verify the exact variant for your controller before ordering. · Touchez une pièce pour tous les codes qui la citent ; vérifiez la variante exacte avant commande.

Frequently asked · Questions fréquentes

What does FANUC alarm PAIN-420 mean?
FANUC PAIN-420 (“WARN %sMax. output has speed < setpoint”): 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.
How do you troubleshoot FANUC alarm PAIN-420?
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.
Which part is involved in FANUC PAIN-420?
PAIN-420 points to Transducer (Transducer). Confirm the real cause against the robot backup before replacing a part.

Related codes / Codes liés

PAIN-418WARN %sTurbine Startup Test Not CompletePAIN-419PAUS %sMax.dV/dT detectedPAIN-428WARN %sBearing Air NOT OKPAIN-429WARN %sCruise Speed not established

Same hardware involved / Même matériel en cause

PAIN-283TransducerPAIN-284TransducerPAIN-443TransducerPAIN-444Transducer

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. · Informations indicatives issues du terrain — le manuel du constructeur et ses procédures de sécurité font foi. Ne shuntez jamais un organe de sécurité ; consignez (LOTO) avant toute intervention physique. How this reference is built →