FANUC Alarm PNT1-646 — Flow rate avg. error excessive
Manufacturer wording — %sFlow rate avg. error excessive
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC PNT1-646 (“Flow rate avg. error excessive”): Comparisons of how far the measured flow rate is from the setpoint had too large of a result. First check: Check, clean, and possibly replace the air cap. Likely part: Transducer (Transducer) +1 more.
Updated 2026-09-17 · LogrobotLM reference
Description
Comparisons of how far the measured flow rate is from the setpoint had too large of a result. The size of the error between measured flow and setpoint that will cause this alarm is controlled by the Max. error from setpoint parameter. Possible causes are:
Remedy
Check, clean, and possibly replace the air cap. Check for oscillating air pressure on the output of the I/P transducer. If found, replace the transducer. Check for a large loss of air supply pressure or pinched air lines. If the alarm occurs on both Fan Air and Atomizing Air or many robots, then possibly increase the Max. error from setpoint parameter.
Part to check / replace
FANUC PNT1-646 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 →