Fanuc Spindle Alarm List: Troubleshooting Guide For 2023

Fanuc Alpha Spindle Module Alarms. Fault, error, alarm codes
Fanuc Alpha Spindle Module Alarms. Fault, error, alarm codes from


In the manufacturing industry, Fanuc CNC machines are widely used for their precision and reliability. However, like any complex machinery, these machines are prone to issues. One common problem that operators often encounter is spindle alarms. These alarms can interrupt production and cause delays if not resolved quickly. In this article, we will provide a comprehensive guide to Fanuc spindle alarms, their causes, and troubleshooting tips to get your machine back up and running smoothly.

Understanding Fanuc Spindle Alarms

Fanuc spindle alarms are error codes that indicate specific issues with the spindle system. They are displayed on the machine’s control panel or CNC screen, making it easier for operators to identify the problem. Each alarm is assigned a unique number, which can be cross-referenced with the Fanuc spindle alarm list to determine the cause and possible solutions.

Common Fanuc Spindle Alarms

1. Alarm 01: Overvoltage

2. Alarm 02: Low voltage

3. Alarm 03: Overcurrent

4. Alarm 04: Control circuit fault

5. Alarm 05: Encoder fault

6. Alarm 06: Excessive speed deviation

7. Alarm 07: Excessive load deviation

8. Alarm 08: Excessive speed variation

9. Alarm 09: Excessive load variation

10. Alarm 10: Excessive speed difference

Troubleshooting Fanuc Spindle Alarms

When facing a spindle alarm, it is important to follow a systematic approach to diagnose and resolve the issue. Here are some troubleshooting tips:

1. Check Power Supply

Start by checking the power supply to the machine. Ensure that the voltage levels are within the specified range. If the voltage is too high or too low, it can trigger spindle alarms. Consult the machine’s manual or contact a professional technician for assistance.

2. Inspect Electrical Connections

Loose or damaged electrical connections can also cause spindle alarms. Inspect all connections, including those between the control panel, drive unit, and spindle motor. Tighten any loose connections and replace any damaged cables or connectors.

3. Verify Sensor Functionality

The spindle system relies on various sensors to monitor speed, load, and other parameters. Check if these sensors are functioning properly. Clean or replace sensors that are dirty or damaged. Calibration may also be required in some cases.

4. Review Alarm History

Access the machine’s alarm history to identify recurring alarms or patterns. This information can provide valuable insights into the root cause of the issue. Address any underlying problems to prevent future alarms.

5. Consult Fanuc Spindle Alarm List

Refer to the Fanuc spindle alarm list to understand the specific alarm code and its possible causes. The list provides detailed explanations and recommended actions for each alarm. This will help you troubleshoot the problem more effectively.

6. Seek Professional Assistance

If you are unable to resolve the spindle alarm or if it persists despite your troubleshooting efforts, it is recommended to seek assistance from a professional technician or the machine manufacturer’s support team. They have the expertise to diagnose and fix complex issues.


Fanuc spindle alarms can be frustrating, but with the right knowledge and troubleshooting steps, you can quickly resolve these issues and minimize downtime. Remember to follow a systematic approach, consult the Fanuc spindle alarm list, and seek professional help when necessary. By effectively troubleshooting spindle alarms, you can ensure the smooth operation of your Fanuc CNC machine and maintain optimal productivity in your manufacturing processes.