Sets the allowable positioning error limit when the axis is stopped (Position Deviation Limit at Standstill).
A faulty servo drive may not be providing enough torque to maintain the position, leading to deviation.
If the physical axis falls behind the commanded position by a value greater than what is specified in Parameter 1829, the controller immediately halts the machine and triggers a servo alarm. Parameter 1829 vs. Parameter 1828
Incorrectly configured servo parameters (such as loop gain settings in Parameter 1825 or load inertia settings in Parameter 2021) can affect how precisely an axis holds position, potentially leading to overshoot that triggers Parameter 1829.
If the axis typically shows a following error of 10 μm when settling into position (as viewed on the servo monitor screen), a setting of (representing 30 μm or 0.030 mm) would provide a safety margin of 3×.
Following error at rapid = 800 / 33.3 ≈ 24 mm! But 1829 = 3 mm. Every rapid retraction caused a 24 mm error but the alarm fired at 3 mm – instant fault.
Conversely, for roughing operations where precision is less critical and mechanical loads are high, a higher Parameter 1829 value may be appropriate. This prevents the machine from alarming out due to normal load-induced deflection during heavy cuts, improving uptime without sacrificing final part quality.
Position loop modifications require a hard reboot of the CNC control to take effect. Advanced Troubleshooting: Matching Loop Gains
Sets the allowable positioning error limit when the axis is stopped (Position Deviation Limit at Standstill).
A faulty servo drive may not be providing enough torque to maintain the position, leading to deviation.
If the physical axis falls behind the commanded position by a value greater than what is specified in Parameter 1829, the controller immediately halts the machine and triggers a servo alarm. Parameter 1829 vs. Parameter 1828
Incorrectly configured servo parameters (such as loop gain settings in Parameter 1825 or load inertia settings in Parameter 2021) can affect how precisely an axis holds position, potentially leading to overshoot that triggers Parameter 1829.
If the axis typically shows a following error of 10 μm when settling into position (as viewed on the servo monitor screen), a setting of (representing 30 μm or 0.030 mm) would provide a safety margin of 3×.
Following error at rapid = 800 / 33.3 ≈ 24 mm! But 1829 = 3 mm. Every rapid retraction caused a 24 mm error but the alarm fired at 3 mm – instant fault.
Conversely, for roughing operations where precision is less critical and mechanical loads are high, a higher Parameter 1829 value may be appropriate. This prevents the machine from alarming out due to normal load-induced deflection during heavy cuts, improving uptime without sacrificing final part quality.
Position loop modifications require a hard reboot of the CNC control to take effect. Advanced Troubleshooting: Matching Loop Gains