When Parameter 1829 is misconfigured, the machine tool will exhibit distinct physical and visual symptoms during operation. Settings Too Low
: If mechanical issues like a physical bind, chip buildup, or poor lubrication cause the axis to drift away from its "home," the difference between where the CNC thinks it is and where it actually is grows .
| Parameter | Function | Key Difference from 1829 | |---|---|---| | | Position loop gain | Sets servo response speed, affecting how quickly the axis corrects following error | | 1826 | In-position width (rapid) | Defines how close the axis must be to the target before the CNC considers it "positioned" | | 1827 | In-position width (cutting) | Same as 1826 but applies during cutting feed operations | | 1828 | Positioning deviation limit (movement) | Maximum allowed error while axis is moving | | 1829 | Positioning deviation limit (stopped) | Maximum allowed error while axis is stationary | fanuc parameter 1829
This parameter defines the maximum allowable deviation (in detection units) between the commanded position and the actual position while the machine is at a standstill. If the axis drifts or is pushed beyond this limit, the system triggers a Servo Alarm 410 (Excessive Position Error). Key Details & Troubleshooting
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: When Parameter 1829 is misconfigured, the machine tool
However, Parameter 1829 is not a "set it and forget it" value. It requires thoughtful configuration that balances the competing demands of precision, productivity, and reliability. Understanding what this parameter does—and what it does not do—empowers maintenance personnel and machine operators to diagnose problems more effectively and keep their machines running optimally.
It acts as a safety monitor for when the machine is supposed to be stationary. Common Alarm: typically occurs if this limit is exceeded. Potential Causes of Error: Mechanical Load: If the axis drifts or is pushed beyond
: Look for packed chips in the ballscrews or dry slides that might be causing a "bind" .