FANUC Alarm PNT2-657 — Max. output has flow < setpoint
Manufacturer wording — %sMax. output has flow < setpoint
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC PNT2-657 (“Max. output has flow < setpoint”): With a maximum control output the flow rate was measured to be lower than the setpoint (requested flow). First check: Check, clean and possibly replace the air cap. Likely part: Air flow sensor (Air flow sensor) +1 more.
Updated 2026-09-17 · LogrobotLM reference
Description
With a maximum control output the flow rate was measured to be lower than the setpoint (requested flow). The Max. control out (ms) parameter effects the sensitivity of this alarm. This is likely caused by a clogged air cap. This may be caused by: pinched air lines, a broken I/P transducer or a broken air flow sensor. Note, AccuAir temporarily automatically changes to Open Loop when this alarm occurs.
Remedy
Check, clean and possibly replace the air cap. If air is observed to be flowing (when commanded), possibly replace the air flow sensor. Check for a pinched air line. Check and repair the I/P transducer. Possibly increase the Max. control out (ms) parameter (by about 50%).
Part to check / replace
FANUC PNT2-657 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 →