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FANUC parameters use (sometimes called increments), not standard millimeters or inches directly.
When Parameter 1829 is set incorrectly, or if mechanical changes occur without updating this value, you will notice specific machine behaviors during the homing cycle: 1. Servo Alarm 410 or 411 (Excess Error)
When an axis is "at rest," the servo motor still actively holds its position. If an external force (like gravity on a vertical axis) or a mechanical bind pushes the axis out of its designated position by more than the 1829 threshold, the control system shuts down the drives to protect the motor from overcurrent or mechanical stress. Troubleshooting Alarm SV0410 fanuc parameter 1829
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.
This is a safety mechanism. If the control tells a motor to move, but the feedback loop (encoder) reports that the motor is lagging too far behind, the control assumes something is physically blocking the axis or the drive system has failed. Shutting down prevents catastrophic mechanical crashes. Common Causes of SV0411 Alarms Related to Parameter 1829 If an external force (like gravity on a
Before changing a single digit, take a snapshot of the screen or output a full parameter backup via the CNC's I/O channel (USB, Memory Card, or Ethernet).
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? If the control tells a motor to move,
Sets the allowable positioning error limit when the axis is stopped (Position Deviation Limit at Standstill).
: On vertical axes (like Z), a failing motor brake can allow the axis to drop slightly when it's supposed to be locked, quickly exceeding the 1829 limit. Encoder or Cable Issues