Applicable Systems
Series 0i
Series 16/18/21
Alpha
Beta
Symptoms
The spindle motor temperature has exceeded the safe operating range.
Possible Causes
- Insufficient cooling or ventilation
- Ambient temperature too high
- Cooling fan failure
- Excessive load on motor or board
Troubleshooting Steps
- Step 1: Check the cooling fan operation for the affected component
Fan is running normally - Step 2: Check the ambient temperature in the electrical cabinet
Temperature is below 45 degrees C - Step 3: Allow the system to cool down before restarting
Temperature returns to normal range - Step 4: If fan is faulty, replace the cooling fan
New fan provides adequate cooling
How to Reset
To reset overheat alarm 704: 1) Identify the overheating component. 2) Allow it to cool. 3) Check and replace faulty fans. 4) Improve cabinet ventilation. 5) Power cycle the CNC. Caution: Operating with overheat conditions can cause permanent damage.
Frequently Asked Questions
- Q: What does 704 mean on Fanuc FANUC 0/0i/30i Series?
The spindle motor temperature has exceeded the safe operating range.
- Q: How do I fix 704 on Fanuc?
Follow the troubleshooting steps: Check the cooling fan operation for the affected component
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Source: FANUC CNC System Alarm Manual (doc.eleok.com)
Category: CNC
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