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.
For detailed setting instructions, refer to the Fanuc 0i-MODEL F Plus Parameter Manual or the Series 16i-18i Parameter Manual . FANUC Series 0i-MODEL F Plus PARAMETER MANUAL
Parameter 1829 does not operate in a vacuum. To properly tune or troubleshoot an axis using this parameter, you must monitor its companion settings:
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? fanuc parameter 1829
: Set PWE back to 0 and cycle power if required by the control. PARAMETER MANUAL
While moving the axis at low speeds with the expanded parameter limit: Go to the > DIAGN (Diagnostic) screen.
If the mechanics are healthy, you may need to increase the value in Parameter 1829 to allow more "wiggle room" during the stop phase. If the servo motor is forced out of position (e
For anyone who has worked with FANUC CNC systems, encountering a "SERVO ALARM" can be a frustrating experience that brings production to a sudden halt. Among the most common and misunderstood culprits behind these alarms is FANUC Parameter 1829. This article provides a comprehensive guide to understanding, configuring, and troubleshooting Parameter 1829—an essential setting for maintaining precision control and avoiding costly downtime in CNC machining operations.
Something is physically pushing the axis out of position (e.g., gravity on a vertical axis without a proper brake or counterbalance). Inertia/Braking:
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. To properly tune or troubleshoot an axis using
Check the lubrication lines to ensure oil is reaching the slides. Step 3: Edit Parameter 1829 (If Necessary)
When the absolute value in your axis error register (which you can monitor at Diagnostic 300
The correct value depends on your specific machine and application. Typical starting values range from 200 to 500 detection units, but this varies by machine type and precision requirements.
Compare your Parameter 1829 values against the machine builder’s recommendations or similar machines. Values that are extremely low (e.g., below 10) may trigger false alarms; values that are extremely high (e.g., above 2000) may mask genuine problems.