FANUC Alarm PNT1-657 — 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 PNT1-657 (“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 and perform the following:
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 affects the sensitivity of this alarm. This is likely caused by a clogged air cap. This might also be caused by: pinched air lines, a broken I/P transducer, or a broken air flow sensor. Note: AccuAir temporarily and automatically changes to Open Loop when this alarm occurs.
Remedy
Check and perform the following:
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 →