Press the Emergency Stop, cycle the main power of the CNC machine, and test the axis movement at low feedrates before running a full rapid traverse.
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Ensure the automatic lubrication system is functioning and that the ways aren't dry Monitor Position Deviation: Use the CNC's Diagnosis Screen
For any serious troubleshooting, always have your machine's original FANUC manuals and the machine tool builder's specific documentation at hand.
If you need to adjust parameter 1829, follow the steps below: fanuc parameter 1829
If a machine experiences a collision or impact while the axis is stationary, the resulting physical displacement will almost certainly exceed the Parameter 1829 threshold. The system interprets this as an "excess error" and triggers the alarm.
A previous crash may have misaligned the ballscrew or damaged the bearings. 2. Servo Tuning and Electrical Issues
Increasing the value in Parameter 1829 increases the allowable deviation in detection units.
Fanuc Parameter 1829 is a specific setting that can be adjusted on Fanuc CNC machines. The parameter is also known as " Scaling factor for pitch error compensation". In simple terms, it is used to adjust the scaling factor for pitch error compensation on the machine's axis. Press the Emergency Stop, cycle the main power
After completing parameter changes, always remember to set Parameter Write Enable back to 0 to prevent accidental modifications.
Understanding FANUC Parameter 1829: Managing Excess Error (Stop) Alarms
Look at Diagnostic numbers to 304 (depending on the exact FANUC model), which display the real-time position deviation (following error) for each axis.
If the value in Parameter 1829 is set too low, the loop gain is insufficient. The motor will lag behind the CNC command. If the lag exceeds the threshold defined in Parameter 1820 or 1828, the CNC triggers a or Alarm 411 (Excess Error Stopped) . 2. Axis Vibration, Humming, or "Hunting" If you share with third parties, their policies apply
: While you can stop the alarm by increasing the value in 1829, technicians warn that this may mask underlying mechanical or lubrication problems. How to Modify Parameter 1829
When tuning a FANUC system, you will frequently see Parameter 1829 referenced alongside (Position Loop Gain for normal operation).
to view the current position deviation on your diagnostic screen? FANUC Series 0i-MODEL F Plus PARAMETER MANUAL
: Indicates the axis was out of position when it was supposed to be stopped.
If Parameter 1829 is adjusted too high, the servo loop becomes overly sensitive. The motor will overshoot its target, overcorrect in the opposite direction, and begin oscillating. This hunting behavior prevents the axis from settling, causing an excess error alarm while trying to stop. 3. SV 0438 - Motor Overcurrent / Overload
