Have you used Parameter 1829 to solve a tricky machining issue? Or has it ever caused a false alarm that drove you crazy? Share your experiences below. 👇
: 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
: While you can technically increase the value to clear an alarm, experts from Practical Machinist warn that this often masks deeper mechanical issues. How to Modify
If your machine is constantly alarming out while it's just sitting there, here’s the typical troubleshooting path: fanuc parameter 1829
When there is a mismatch or data entry error in Parameter 1829, the machine will usually refuse to enter a "Ready" state or will throw a servo-related error during startup or axis initialization.
When an "Excess Error" alarm occurs related to this parameter, technicians often investigate the following:
Are you currently experiencing a specific or physical symptom? Have you used Parameter 1829 to solve a
Setting Parameter 1829 too low causes nuisance alarms. Setting it too high can mask real mechanical issues, leading to crashes or part damage.
Look at Parameter 1825. If 1825 is set to 3000 but 1829 is accidentally set to 1000 , change 1829 to match 3000 . If they already match, check if Parameter 1424 (deceleration speed) is too high, forcing the axis to slam past its deceleration zone.
To truly understand Parameter 1829, you must understand (Servo Loop Gain). Parameter 1825, measured in sec⁻¹ or (mm/min)/mm , defines how aggressively the servo corrects errors. 👇 : On vertical axes (like Z), a
: It monitors the "error register" (positional deviation) when the motor is stopped.
Fanuc Parameter 1829: Managing Stopping Positional Deviation
This alarm occurs if the difference between the commanded position and the actual position exceeds a calculated threshold while the axis is in motion. If Parameter 1829 is set too low during a rigid tapping cycle, the Z-axis cannot keep up with the spindle, triggering SV 0411. 2. SV 0410 - Excess Error (Stopped)
Clear any tools or workpieces away from the spindle and table.
In the CNC world, "stop" doesn't always mean "frozen." Even when the machine is waiting for its next command, the servo motors are constantly fighting to keep the axis at the exact coordinate.