Disclaimer: Modifying FANUC parameters should only be done by qualified maintenance personnel. Incorrect values can cause severe machine damage. Data Units
If the parameter is set correctly but the alarm is new, the motor might be physically struggling to keep up with the commanded speed.
The performance of Parameter 1829 is tied to its neighbors: 1826, 1828, and 1825.
Understanding FANUC Parameter 1829: The Silent Guardian of Your Servo Torque fanuc parameter 1829
If the servo motor is forced out of position (e.g., by physical obstruction, mechanical backlash, or failure of a brake) by an amount that exceeds this parameter, the NC (Numerical Control) will trigger a servo alarm and stop to prevent damage to the workpiece or the machine.
Specific troubleshooting steps for Z-axis vs. X-axis 1829 alarms. How to isolate the motor and check for a faulty encoder. How to solve Excess Error Stop problem in CNC machine?
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. Disclaimer: Modifying FANUC parameters should only be done
sets the position deviation limit when the axis is moving . Because an axis requires more tolerance to accelerate, decelerate, and fight cutting forces while moving, the value in 1829 is almost always significantly larger than the value in 1828. The Consequence: Alarm SV0411 (Excess Error)
The system's units (metric or imperial) are determined by another parameter, typically , which is the fundamental basis for this measurement.
Here is a detailed breakdown of its function, typical values, and troubleshooting implications. The performance of Parameter 1829 is tied to
In FANUC CNC systems (such as the 0i-D, 0i-F, 16i/18i/21i, and 31i series), defines the Position Loop Gain for the reference position setting (often designated as loop gain for the 1st reference position or rigid tapping).
: Noise in the feedback cable or a "dirty spot" on scales can feed the CNC incorrect position data, making it think the axis has moved when it hasn't. External Forces