Fanuc Parameter 1829 -

EXCESS ERROR (STOP)

Fanuc uses two primary parameters to monitor positional error based on whether the machine is moving or stationary: Parameter 1828: Limits deviation while the axis is Parameter 1829: Limits deviation while the axis is Common Causes for 1829 Alarms

The DCS system incorporates position and speed-checking capabilities to monitor the servo motor data. If a position or speed mismatch is detected by a cross-check using two CPUs, the safety function stops operation safely.

Never increase Parameter 1829 just to bypass an alarm without checking the hardware. Turn off machine power.

Before altering Parameter 1829 on a machine that previously ran fine for years, consider that . Parameter values do not change on their own; hardware degrades over time. fanuc parameter 1829

Understanding FANUC Parameter 1829: The "Excess Error" Guard If your CNC machine has ever ground to a halt with a 410 Servo Alarm , you've likely encountered FANUC Parameter 1829

When the deviation exceeds the 1829 limit, you'll typically see a 410 Servo Alarm . Common causes include: Mechanical Obstructions:

If the position loop gain is set too low, the axis will respond sluggishly, increasing the following error beyond the 1829 threshold.

Understanding Fanuc Parameter 1829: In-Position Range (Excess Error Stop) EXCESS ERROR (STOP) Fanuc uses two primary parameters

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.

Check the lubrication lines to ensure oil is reaching the slides. Step 3: Edit Parameter 1829 (If Necessary)

2-word (32-bit) integer data type, designated per axis.

There is no single "correct" value for Parameter 1829, as it depends on the machine's construction, rigidity, load capacity, and desired precision. However, general guidelines are typically provided by machine tool builders. Turn off machine power

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.

: It monitors the "error register" (positional deviation) when the motor is stopped.

If you are encountering servo alarms, positioning inaccuracies, or rigid tapping errors, understanding how Parameter 1829 works is essential for troubleshooting. What is FANUC Parameter 1829?