Fanuc Parameter 1829

Before proceeding: You must have password/access level to FANUC’s parameter writing enable. Typically, this requires setting PWE (Parameter Write Enable) to "1" or having a maintenance key.

Machine A (FANUC 0i-MF, Vertical Machining Center):

Machine B (High-end 30i, Linear Motor):

Machine C (Precision Lathe, low rapid):

Warning: Setting Parameter 1829 too low causes nuisance alarms. Setting it too high can mask real mechanical issues, leading to crashes or part damage. fanuc parameter 1829

When Alarm 410 occurs, checking the diagnostic parameters (usually Diagnostic 300 series, e.g., DGN300) will show the actual error amount at the moment of the alarm.

| Symptom | Probable Cause | Solution | |---------------------------------------|------------------------------------------|-----------| | Axis stops early, no alarm | 1829 set lower than actual physical limit | Increase 1829 value | | OT+ alarm immediately on power up | Machine position beyond 1829 due to reference shift | Reset reference position or temporarily increase 1829 | | Alarm when approaching limit 1 | 1828 > 1829 | Set 1828 < 1829 | | Parameter won't change | PWE = 0 or write-protect key ON | Enable PWE and check hardware key | Before proceeding: You must have password/access level to

Alarm PS081 / PS082 on M98 or M198
    ↓
Check if subprogram exists (Program List screen)
    ↓ Exists
Increase Parameter 1829 (e.g., double current value)
    ↓
Retest
    ↓ Still fails
Check if subprogram is stored BEFORE the call point in memory order
    ↓ If after
Rename/reorder programs (Program numbers don’t determine search order — creation order does)
    ↓
Still fails? → Check DNC buffer settings (Parameter 138, 139) or switch to local subprograms

Parameter 1829 is Axis-Specific, meaning there is a separate setting for each controlled axis (X, Y, Z, 4th, etc.).

Parameter Number: 1829
Full Name: Servo Software Stroke Limit 2 (Positive Direction)
Control Type: FANUC Series 0i, 30i/31i/32i, 16i/18i/21i, and similar CNC models. Machine B (High-end 30i, Linear Motor):

Parameter 1829 defines the second positive software overtravel limit for servo axes. It works in conjunction with Parameter 1828 (first positive limit) to provide a multi-stage safety boundary for axis movement.