Understanding FANUC Parameter 1829: Managing Position Deviation Limit During Moving
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.
If the 1829 alarm happens just as the machine stops, the acceleration/deceleration time constant might be too short (too abrupt). fanuc parameter 1829
The relationship between these parameters is interconnected. For example, excessive following error during movement (Parameter 1828 violation) may lead to overshoot after stopping, potentially triggering Parameter 1829 as well. Conversely, improper loop gain settings (Parameter 1825) can cause instability that manifests as stopping errors.
Change PARAMETER WRITE back to 0.
Applying a safety multiplier of 1.5x to 2x yields a Parameter 1829 value between . Step-by-Step Troubleshooting Guide
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In a closed-loop CNC system, the controller constantly compares the (where the CNC tells the axis to go) with the Actual Position (where the encoder says the axis is). The difference is called the Position Error (or Following Error).
Defines the acceptable micron-level window where the CNC considers the axis to have reached its target position. If 1829 is adjusted incorrectly, the machine may throw an "In-Position Excess" alarm because the axis cannot settle within the window specified by 1826. Common Alarms Linked to Parameter 1829 The relationship between these parameters is interconnected
This alarm is a protective measure. It indicates that the control system is telling the motor to move, but the motor is unable to keep up with the commanded speed or position. Without this alarm, if an axis encountered a heavy mechanical bind, the servo motor would continue to draw maximum current trying to force its way through, destroying gears, ballscrews, or the motor itself. Common Causes of Parameter 1829 Alarms
Understanding and Troubleshooting FANUC Parameter 1829: Excessive Error (Stop) Change PARAMETER WRITE back to 0