Fanuc Parameter 1829 [extra Quality] Jun 2026
Parameter 1829 does not operate in a vacuum. To properly tune or troubleshoot an axis using this parameter, you must monitor its companion settings:
In the FANUC CNC architecture, Parameter 1829 defines the or the Position Loop Gain during specific cutting states (depending on the exact control series, such as 0i-D, 0i-F, 16i/18i, or 31i). The Concept of Position Loop Gain
0 (or a small number like 10–50, depending on the control model and firmware). Typical range: 0 to 9999 . fanuc parameter 1829
Increase the parameter by a small increment (e.g., 10-20%) and test the machine.
For applications such as mold making, aerospace component manufacturing, or medical device production, maintaining tight tolerances is essential. In these cases, Parameter 1829 should be set at relatively low values to ensure the machine halts any operation at the earliest sign of a position deviation. However, this increased sensitivity also means that the machine is more likely to generate nuisance alarms from minor mechanical irregularities. Parameter 1829 does not operate in a vacuum
: If this difference (the servo error) exceeds the value set in Parameter 1829, the system triggers a Servo Alarm (typically Alarm 410: Servo Excess Error Stop).
Alternatively, if you'd like to share the machine's symptoms (e.g., alarm happens during tool change vs. during cutting), I can help you narrow down the issue. Share public link Typical range: 0 to 9999
Understanding FANUC Parameter 1829: Diagnosis and Fixes for Position Loop Gain Matrix Errors
If Parameter 1829 is set incorrectly, or if the mechanical component is struggling, you may encounter the following Fanuc servo alarms:
Specifically on the Z-axis, a stuck or malfunctioning brake can cause this error. Verify the brake is releasing completely.
The value for Parameter 1829 is generally set based on the maximum mechanical drift or servo hunting expected during a stop. FANUC recommends the following formula: