External interference in the motor or feedback lines can sometimes trigger false deviation readings. How to Diagnose and Fix the Issue Check Diagnostics: Look at your diagnostic screen (usually Diagnostic 300
is a servo parameter in FANUC Series 0i, 15i, 16i, 18i, 21i, 30i, 31i, and 35i controls. Its official name varies slightly between control generations, but it is most commonly referred to as:
Parameter 1829 is a safety parameter. Raising it too high is dangerous. Lowering it too much stops production. Understand the trade-offs: fanuc parameter 1829
If the difference between the commanded position and the actual position (positional deviation) exceeds the value set in this parameter while the axis is not moving, the system triggers a ("EXCESS ERROR STOP"). Key Specifications
Parameter 1829 defines the allowable position deviation (servo lag) while an axis is in motion. External interference in the motor or feedback lines
Changing Parameter 1829 is not a "one size fits all
If P1829 is not the root cause, check:
It is often set to roughly 10–20 times the actual positioning accuracy of the machine.
Monitors the error when the axis is supposed to be standing still. Raising it too high is dangerous