Fanuc Parameter 1829 |top| May 2026
The Role and Impact of FANUC Parameter 1829 in CNC Systems In the sophisticated world of Computer Numerical Control (CNC), precision is maintained through a delicate balance of electrical commands and mechanical feedback. Among the thousands of settings that govern a FANUC control system, Parameter 1829 serves as a critical safety and precision threshold, specifically defining the limit for positional deviation (excess error) while an axis is in a stopped state. Defining Parameter 1829: Excess Error (Stop)
2. The Technical Mechanism: How the Search Works
When a main program runs and encounters M198 P1000 (call subprogram O1000 from an external device): fanuc parameter 1829
Mechanical Check: Look for packed chips in the ballscrews or dry slides that might be causing a "bind" . The Role and Impact of FANUC Parameter 1829
When an "Excess Error" alarm occurs related to this parameter, technicians often investigate the following: Press [SYSTEM] → [PARAM] → scroll to parameter 8900
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For more information on FANUC CNC systems and parameter 1829, please refer to the following resources:
- Press [SYSTEM] → [PARAM] → scroll to parameter 8900? Not necessary. Instead, go to parameter 8000 (on older) or press the [OFS/SET] key → [SETTING] → set PWE = 1 (this will flash "PNC" or "PRM" alarm – normal).
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 SV0410: Excess Error (Stop) alarm to prevent machine damage or unsafe operation. Technical Function and Alarm Triggers