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FANUC Alarm PAIN-490 — WARN Pump 2 zero fluid flow rate detected

FANUC PAIN-490 (“WARN Pump 2 zero fluid flow rate detected”): Zero fluid flow out of pump #2 is detected. First check: Check the mechanical coupling between the motor and the pump.

Updated 2026-09-17 · LogrobotLM reference

Description

Zero fluid flow out of pump #2 is detected. This condition is usually caused by one or more of the following: 1. A loose mechanical coupling between the motor and pump. 2. A broken line between the pump and trigger.

Remedy

Check the mechanical coupling between the motor and the pump. Make sure the line from pump to trigger is ok.

Related codes

PAIN-488WARN Pump 2 fluid flow rate > set pointPAIN-489WARN Pump 2 fluid flow rate < set pointPAIN-491WARN Pump 2 motor velocity limitPAIN-492WARN Pump 2 motor servo not ready

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 →