If the alarm occurs on the Z-axis, it is often due to a failing brake or ice-cube relay, allowing the axis to drop when stopped. 2. Adjusting the Parameter Value
| Step | Action | | :--- | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | 1 | . This is a safety prerequisite before making any system-level changes. | | 2 | Enable Parameter Write : Press the OFFSET/SETTING function key. On the SETTING (or HANDY ) screen, use the cursor keys to navigate to PARAMETER WRITE . Change this value to 1 (to enable write). The system will immediately flash a P/S 100 alarm, which is normal for this state. | | 3 | Navigate to Parameter 1829 : Press the SYSTEM function key. Then, repeatedly press the soft key under PARAM (or PARAMETER ). Type 1829 and press the INPUT ( NO.SRH ) soft key. This will take you directly to the 1829 parameter screen. | | 4 | Enter the New Value : Type your new value (as per the machine builder's specifications) into the keypad. Then, press the INPUT soft key to confirm and write the value. Ensure the new value aligns with the detection unit settings of your system. | | 5 | Disable Parameter Write & Clear Alarm : Return to the OFFSET/SETTING screen and change PARAMETER WRITE back to 0 to disable modification. Press the RESET key on the main panel to clear the P/S 100 alarm. |
: It is specifically used to detect "Excess Error" during a stop state, which is distinct from error limits during active movement. Common Alarms Related to Parameter 1829
When a machine frequently hits the limit set by Parameter 1829, it is rarely a software glitch; rather, it is usually a symptom of underlying mechanical or electrical distress: fanuc parameter 1829
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.
When the axis is commanded to stop and the position error exceeds the threshold defined in Parameter 1829, the system triggers a servo alarm and immediately halts servo operation to prevent potential damage to the machine or workpiece.
Check the servo amplifier for fault LEDs. Test motor power cables for continuity and proper connection. If the alarm occurs on the Z-axis, it
If Parameter 1829 is set to less than 3000 µm, the machine will alarm during routine cutting. Therefore, plus margin for acceleration.
Modifying CNC parameters carries inherent risks. Follow these steps carefully to ensure a safe adjustment process. Step 1: Backup Your System
| Scenario | Typical Value Range | Notes | | :--- | :--- | :--- | | | 10 - 50 (detection units) | For very tight tolerances | | General Machining / Lathe | 100 - 500 (detection units) | For most applications | | Heavy-Duty / Large Machinery | 500 - 2000 (detection units) | Accounts for heavier mechanical loads and larger inertias | | Special Case: Rigid Tapping | 200 - 500 (detection units) | Requires specific values for synchronization between spindle and Z-axis | This is a safety prerequisite before making any
If expanding Parameter 1829 clears an alarm but uncovers a mechanical lubrication failure, always restore Parameter 1829 to its original OEM factory value after resolving the mechanical friction. Leaving it set too high risks severe mechanical damage during a true component failure.
In modern FANUC 30i-B and 31i-B5 controls, the search algorithm has been optimized, but the parameter remains for backward compatibility with decades of existing programs.
It defines the acceptable difference between the commanded position and the actual position indicated by the motor encoder when the motor is supposed to be at rest.