| Scenario | Typical Value Range | Notes | | :--- | :--- | :--- | | | 10 - 50 (detection units) | For very tight tolerances | | General Machining / Lathe | 100 - 500 (detection units) | For most applications | | Heavy-Duty / Large Machinery | 500 - 2000 (detection units) | Accounts for heavier mechanical loads and larger inertias | | Special Case: Rigid Tapping | 200 - 500 (detection units) | Requires specific values for synchronization between spindle and Z-axis |
If the actual following error of an axis exceeds the limit specified in Parameter 1829 during a move, the FANUC system immediately halts operation and triggers .
: Consult your PARAMETER MANUAL or the Series 16i-18i Parameter Manual to ensure the value isn't set too low for your machine's mechanical tolerances.
With a thorough understanding of FANUC Parameter 1829, you will be better equipped to maintain your CNC equipment’s precision, minimize unexpected downtime, and produce high-quality parts reliably. fanuc parameter 1829
To isolate mechanical issues from electrical faults, technicians often temporarily increase the value of Parameter 1829.
Parameter 1829 defines the (often labeled as Position Deviation Limit Value at Motion or In-Motion Position Error Limit ).
It defines the acceptable difference between the commanded position and the actual position indicated by the motor encoder when the motor is supposed to be at rest. | Scenario | Typical Value Range | Notes
EXCESS ERROR (STOP)
If the value in Parameter 1829 is set too high, the loop gain is overly aggressive. The axis will overcorrect, shoot past its target, pull back, and overshoot again. This causes a high-frequency vibration or audible humming when the axis approaches its reference point. 3. Poor Rigid Tapping Thread Quality
The most frequent cause of stopping position errors is mechanical resistance or binding. If a ballscrew has debris accumulation, lubrication is insufficient, or guideways have excessive friction, the axis may not settle properly into its commanded position after movement ceases. "For a rotary axis, the internal brake mechanism is worn or binding" can also contribute to these alarms. EXCESS ERROR (STOP) If the value in Parameter
plays a critical role in the safety and precision of CNC operations. By understanding that it defines the allowable positional deviation during a stop, operators can quickly identify the root causes of SV0410 alarms, which usually stem from mechanical problems rather than improper parameter settings.
By systematically understanding and controlling FANUC Parameter 1829, maintenance professionals can eliminate persistent rigid tapping errors, cure erratic axis oscillations, and maintain tight machining tolerances.
Binding, chips packed in the ballscrew, or lack of lubrication. Hardware Failure: A bad motor, encoder, cable, or servo drive.
When faced with excessive error alarms (SV0410), the fix isn't always to increase the parameter. A smaller value indicates high precision, while a larger value is more forgiving. 1. Check for Mechanical Obstructions