If an axis is binding due to worn thrust bearings, low lubrication, or way damage, raising 1829 will just mask the problem—until something breaks catastrophically.
If the machine was recently retrofitted, or if parameters were wiped and reloaded, Parameter 1829 might simply be set too low. The standard rule of thumb for calculating the baseline value for Parameter 1829 is:
Press the key, then press the right arrow softkey until you see [DIAGN] (Diagnosis).
If you are seeing an alarm related to this parameter, check the following: fanuc parameter 1829
Change from 0 to 1. Ignore the resulting P/S 100 alarm. Press the SYSTEM key, then the [PARAM] softkey. Type 1829 and press [No. SRCH] .
: Often set higher than Parameter 1826 (In-Position Width) to allow for minor settle time, but small enough to detect genuine mechanical issues. Troubleshooting "Excess Error Stop" (Alarm 410)
Contamination or damage to the encoder/scale can cause intermittent feedback drops, tricking the system into reading a massive positional error. Step-by-Step Troubleshooting and Adjustment If an axis is binding due to worn
Understanding FANUC Parameter 1829: Diagnosis and Fixes for Position Deviation Errors
If the servo gain is too low, the motor might "drift" too far from its target position. Troubleshooting and Adjustments
When the position deviation exceeds the value stored in Parameter 1829 for a sustained period (though the alarm is often near-instantaneous), the CNC halts all motion and triggers a servo alarm. This prevents mechanical damage, tool breakage, or scrapping of the workpiece. If you are seeing an alarm related to
The occurs when the axis, after stopping, detects a position deviation that is higher than the setting in Parameter 1829. This is not a "move error" that happens while cutting; it is a "stop error" that happens when the machine should be still. Common Causes for Alarm 410 (Parameter 1829 Trigger)
If you have ever encountered a sudden "SV0410 (SERVO ALARM: Excessive Mismatch)" or "SV0401 (SERVO ALARM: Mismatch)" during heavy cutting or a rapid traverse, Parameter 1829 is the critical value controlling that fault detection. This article will dissect what Parameter 1829 is, how it works, how to calculate it, and the step-by-step procedure to modify it safely.
If Parameter 1829 is set to less than 3000 µm, the machine will alarm during routine cutting. Therefore, plus margin for acceleration.