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.
: If the positional deviation exceeds the value set in parameter 1829, the CNC system will trigger an "Excess Error (Stop)" alarm.
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 fanuc parameter 1829
: When this threshold is breached, the NC typically initiates an emergency stop and disables the drives to prevent potential machine damage or injury. Common Causes for Parameter 1829 Alarms
Parameter 1829, formally known as the "Positional Deviation Limit in Stopped State," sets the maximum allowable difference between the commanded position and the actual position detected by the motor encoder when an axis is not moving. In a perfectly tuned system, this deviation should be near zero. However, external forces—such as gravity on a vertical axis or mechanical friction—can cause "drift". If this deviation exceeds the value stored in Parameter 1829, the system triggers a alarm to prevent machine damage or unsafe operation. Technical Function and Alarm Triggers Press the Emergency Stop, cycle the main power
If the position loop gain is set too low, the axis will respond sluggishly, increasing the following error beyond the 1829 threshold.
If the actual following error of an axis exceeds the limit specified in Parameter 1829 during a move, the FANUC system immediately halts operation and triggers . Common Causes for Parameter 1829 Alarms Parameter 1829,
FANUC parameter 1829 is a specific setting in FANUC CNC systems that controls the "Absolute" or "Incremental" mode selection for the spindle. This parameter determines how the spindle's position is interpreted and executed. In other words, it defines whether the spindle's movement is measured in absolute coordinates or incremental changes.