Understanding Fanuc Parameter 1829: Positional Deviation Limit
Parameter 1829: Sets the limit for this error while the axis is stopped (linked to Alarm 410).
Typical Values (Example for a standard milling machine): fanuc parameter 1829
In the world of FANUC-controlled CNC machining centers and lathes, thousands of parameters dictate everything from axis acceleration to spindle orientation. Most operators are familiar with common settings like parameter 1815 (absolute encoder setup) or parameter 1320 (stroke limits). However, one parameter often remains misunderstood until a machine alarm brings it into the spotlight: FANUC Parameter 1829.
If Parameter 1829 is set to less than 3000 µm, the machine will alarm during routine cutting. Therefore, Parameter 1829 must always be greater than the steady-state following error plus margin for acceleration. However, one parameter often remains misunderstood until a
To truly understand Parameter 1829, you must understand Parameter 1825 (Servo Loop Gain). Parameter 1825, measured in sec⁻¹ or (mm/min)/mm, defines how aggressively the servo corrects errors.
Trigger: If the positional deviation exceeds the value set in parameter 1829, the CNC system will trigger an "Excess Error (Stop)" alarm. The Critical Relationship: Parameter 1825 and Parameter 1829
While it is tempting to simply increase the value in Parameter 1829 to "clear" the alarm, this often masks a deeper mechanical issue . Follow these steps instead: Check for Binds: