Fanuc Parameter 1829 -

| Property | Specification | |------------------|---------------------------------------| | Data Type | 4-byte integer (Real number, no decimal) | | Input Unit | Machine detection unit (mm, inch, degree) | | Sign | Positive only for positive stroke limit | | Default Value | Usually +99999999 (effectively disabled) |

The most common symptom of Parameter 1829 being triggered is Servo Alarm 410.

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. fanuc parameter 1829

The theoretical following error during constant velocity is calculated as:

Following Error (in mm) = Feedrate (mm/sec) / Loop Gain (Parameter 1825)

Example:

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.

Machine A (FANUC 0i-MF, Vertical Machining Center): Example:

Machine B (High-end 30i, Linear Motor):

Machine C (Precision Lathe, low rapid):

Warning: Setting Parameter 1829 too low causes nuisance alarms. Setting it too high can mask real mechanical issues, leading to crashes or part damage.