Parameter 1829: Fanuc

You must have password/access level to FANUC’s parameter writing enable. Typically, this requires setting PWE (Parameter Write Enable) to "1" or having a maintenance key.

Navigate to Parameter 1829 and locate the specific axis.

Do you need assistance calculating the based on your mechanical gear ratio or pitch? Share public link

To change Parameter 1829, you must place the machine in MDI mode, navigate to the SETTING page, and set PARAMETER WRITE = 1 . Expect the machine to throw a P/S 100 alarm; this is normal and simply means parameter write is active. fanuc parameter 1829

Step down Parameter 1829 in increments of 500 (e.g., from 3000 down to 2500). Test the homing cycle after each power cycle until the vibration stops. Conclusion

When Parameter 1829 is misconfigured, mismatched across axes, or rendered unstable by mechanical wear, the FANUC system will trigger specific servo alarms ( SV Alarms ): 1. SV 0411 - Excess Error (Moving)

Check the current value of parameter 1829. Compare it with the machine builder's recommendations. If the value is set too low, the system may generate nuisance alarms even under normal conditions. If you suspect the parameter was accidentally changed, cross-reference it with the machine's original parameter backup. You must have password/access level to FANUC’s parameter

For more information on FANUC CNC systems and parameter 1829, please refer to the following resources:

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

| Parameter | Function | Relationship to 1829 | | :--- | :--- | :--- | | | Servo Loop Gain | Determines natural following error. 1829 must exceed 1825's error. | | 1826 | In-Position Width | Defines "enough" error before servo settles. Must be smaller than 1829. (Rule: 1829 >= 10 * 1826) | | 1827 | Stop Mismatch Limit | Alarm if error remains after stopping. Usually set smaller than 1829. | | 1828 | Move Mismatch Limit (High gain) | Used with high-gain mode. Overlaps 1829 function in some controls. | Do you need assistance calculating the based on

Parameter 1829 is grouped under the . It is an axis-specific parameter, meaning it can be configured with unique values for individual linear and rotary axes (X, Y, Z, A, B, C) depending on their structural weights and mechanical setups.

Detection units (typically millimeters or inches, scaled by the machine's increment system—often 0.001mm or 0.0001 inches).

Where:

: Once that gap (positional deviation) exceeds the value you’ve tucked away in Parameter 1829 , the machine triggers an Excess Error (Stop) alarm to prevent potential crashes or inaccurate cuts when it starts moving again . Why You Might Need to Visit 1829

Parameter 1829 does not work in isolation. Its function is closely related to several other servo parameters. Proper tuning requires a holistic understanding of all these settings.