Fanuc Parameter 1829 !link!

It monitors axis stability when not moving. If an axis drifts or is pushed out of position while stopped, this parameter catches the error. Comparison: It works alongside Parameter 1828 , which sets the limit for deviation while the axis is Common Causes for Alarm 410: Mechanical Issues:

: Set PWE back to 0 and cycle power if required by the control. PARAMETER MANUAL

In FANUC CNC systems (such as the 0i-D, 0i-F, 16i, 18i, 21i, and 30i/31i/32i series), defines the Position Loop Gain Deviation Limit During Movement (often referred to as the dynamic position deviation limit or moving positional deviation limit). fanuc parameter 1829

When a CNC machine performs rigid tapping, the Z-axis linear feedrate must match the spindle's rotary motion precisely to maintain the correct thread pitch. If the spindle lags or the Z-axis overshoots, the threads will strip, or the tap will snap.

Parameter 1829 defines the for servo axes. It works in conjunction with Parameter 1828 (first positive limit) to provide a multi-stage safety boundary for axis movement. It monitors axis stability when not moving

Prior to changing Parameter 1829 or related velocity/gain parameters, take an SRAM backup or output your parameter file to a Flash card/USB drive.

Imagine commanding the X-axis to move 100 mm at 10,000 mm/min. The servo drive sends power to the motor. The motor’s encoder reports back every few milliseconds. Ideally, the difference between "where it should be" and "where it is" (called the following error) remains small—typically a few microns. PARAMETER MANUAL In FANUC CNC systems (such as

Faulty servo amplifiers or motors may fail to maintain proper position holding torque, allowing axis movement even when no command is present. "The servo amplifier or motor is defective, causing the motor to be unable to drive the mechanical load".

If the actual lag behind the commanded position exceeds the threshold value specified in Parameter 1829 while the axis is interpolating or traversing, the CNC control halts operation immediately to protect the machine from physical damage. Associated Alarms: SV 0411

: A ballscrew that is tight, or linear ways that are poorly lubricated, can physically pull or push an axis out of its "stopped" position. Failed Brakes

The value entered into Parameter 1829 represents the minimum deviation required to trigger an alarm.