axismd.ai
FANUC Controller
Spindle · Basic · 5-15 minutes
Fanuc Alarm 3001 - Spindle Speed Zero
Fanuc Alarm 3001, Spindle Speed Zero, typically occurs when an M03 or M04 spindle start command is executed without a specified non-zero spindle speed (S word). The most common fix is to ensure a valid S command with a non-zero RPM is programmed before the spindle start command. This is a basic safety interlock issue often resolved by reviewing and editing the CNC program.
3001
Fanuc Alarm 3001 - Spindle Speed Zero
SPINDLE ALARM 3001
Alarm 3001 fires when M03 or M04 is executed but the programmed spindle speed is zero or no S word has been specified. Fanuc requires a valid non-zero speed before allowing spindle rotation. This is a safety interlock — a missing or zero S word is the most common cause.
Root Cause Summary
Fanuc Alarm 3001, Spindle Speed Zero, typically occurs when an M03 or M04 spindle start command is executed without a specified non-zero spindle speed (S word). The most common fix is to ensure a valid S command with a non-zero RPM is programmed before the spindle start command. This is a basic safety interlock issue often resolved by reviewing and editing the CNC program.
Causes and Fixes
- 1
Locate Alarm Block
Scroll to the program line where the alarm 3001 was triggered and check for M03 or M04 without an S command in the same or preceding block.
Use the machine's program check function to highlight the active block at the time of the alarm.
Ensure the machine is in a safe state before editing the program.
- 2
Add Spindle Speed Command
Edit the program to include an S command with a valid RPM value before the M03 or M04, e.g., insert 'S1200' for 1200 RPM.
Refer to the workpiece material and tool specs to select an appropriate spindle speed.
Avoid excessively high speeds that could damage the tool or workpiece.
- 3
Test Run Program
Restart the program in single-block mode to verify the spindle starts correctly with the updated S command and no alarm occurs.
Monitor spindle behavior during the test to ensure smooth operation.
Keep hands clear of moving parts during testing.
Call a technician if:
- ·If the alarm persists after verifying and correcting all program and override settings
- ·If there is suspicion of a control system or hardware fault affecting spindle speed detection
Prevention
- Always include a non-zero S command before M03 or M04 in programs and MDI operations.
- Regularly train operators on proper spindle speed programming and override usage.
- Use program templates with mandatory S commands to avoid omissions.
- Check spindle override settings before starting operations.
Common Mistakes
- Forgetting to update S value after switching between G96 and G97 modes.
- Assuming spindle speed carries over from a previous operation without explicit programming.
Seeing Multiple Alarms?
Seeing another alarm with this one? Enter the code.
Get machine-aware diagnosis
AxisMD logs alarms against your actual machines, tracks patterns, and gives AI context your manual doesn't have.
Start freeWas this guide helpful?
Always verify with your machine manual or a certified technician before performing service procedures.