In FANUC CNC systems, some alarms are related to system configuration, program errors, or hardware failures. These alarms can be more complex and require structured troubleshooting.
This guide explains additional common FANUC alarms and provides practical solutions to help reduce downtime and improve machine reliability.
1. How to Fix FANUC Alarm 5523?
Cause
Alarm 5523 occurs when the OPRM.INF configuration file in FROM memory is overwritten or deleted.
Solution
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Contact FANUC technical support
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Or consult REACO CNC technical service
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Avoid modifying system files without proper authorization
Related article: How to solve Fanuc PS5523/5524 Alarm
2. How to Solve FANUC Alarm 5560?
Cause
Alarm PS5560 occurs during deep hole rigid tapping when:
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Cutting depth (Q) is smaller than return amount (D)
Solutions
Long-Term Solution
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Optimize tapping parameters
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Adjust cutting depth and return values properly
Temporary Solution
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Set parameter:
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5209#7 = 0
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5200#5 = 1
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⚠️ Note: Temporary parameter changes may affect long-term machining stability.
3. FANUC 0i-TF SYS1959 PC051 Troubleshooting
Possible Causes
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Short circuit in I/O circuit causing 24V voltage drop
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Faulty 24V power supply
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Damaged I/O cables
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I/O board failure
Solution
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Check 24V power supply stability
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Inspect I/O wiring
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Replace faulty cables or I/O modules step by step
4. What to Do When CNC Screen is Black?
Troubleshooting Steps
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Check if 24V power supply to NC is normal
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Confirm screen condition:
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Completely black
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Or showing SYS_ALM alarm message
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Check mainboard digital display
Recommendation
Collect the above information and contact REACO CNC technical support for further diagnosis.
5. How to Backup FANUC System Files to CF Card?
Important Note
FANUC generally does not allow direct system file backup or import by users.
Recommended Backup Method
Step 1: Enter BOOT Screen
Use system boot interface
Step 2: Backup Data
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Select SYSTEM DATA SAVE → Backup PMC to CF card
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Select SRAM DATA UTILITY → Backup SRAM packaged data
Warning
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Different system series have different BOOT interfaces
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Incorrect operations may result in system data loss
Related article: FANUC CNC Parameter Backup Guide
6. How to Clear EX1096 Alarm?
Cause
EX1096 is a machine builder-defined alarm, usually indicating:
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Tool clamping timeout
Solution
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Refer to machine tool manual
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Follow alarm instructions provided by manufacturer
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Contact machine builder for precise troubleshooting
7. How to Fix SV0438 Alarm?
Cause
SV0438 indicates excessive motor current, often caused by:
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Loose motor power cable connections
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Electrical arcing at connectors
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Servo amplifier or motor failure
Solution
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Inspect motor power cable connectors
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Check for burn marks or loose terminals
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Replace faulty components if necessary
8. What is PS0518 Alarm and Why Program Cannot Be Loaded?
Cause
PS0518 occurs when:
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A semicolon (EOB) is included inside a comment block during program input
Solution
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Modify parameter:
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11374#0 = 0
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Review and correct program formatting
9. FSSB Alarm with Black Screen (AMP2 <- AMP3)
Explanation
This is a system-level FSSB alarm, related to amplifier communication.
Key Logic
Amplifier numbers follow fiber optic connection order:
Integrated Amplifier
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AMP01 → Spindle side
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AMP02 / AMP03 → Axis amplifiers (based on parameter P1023 order)
Example:
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If P1023 = X, Y, Z
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AMP02 = X axis
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AMP03 = Y axis
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Separate Amplifier
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Additional axes follow sequence
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Example:
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B-axis after Z → AMP05
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10. How to Solve FANUC Alarm 9031?
Case Analysis
1. Manual Spindle Cannot Rotate
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Mechanical blockage in spindle
2. No Spindle Speed Display
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Faulty spindle motor sensor
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Feedback cable issue
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Incorrect connection (e.g., JYA2)
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Possible spindle drive issue
3. Normal Speed Display but No Rotation
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Power cable disconnection
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Phase loss
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Possible spindle amplifier fault
4. Alarm During Cutting
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Excessive cutting load
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Improper speed/feed settings
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Torque overload
Reference Source: Beijing FANUC. This article is based on technical documentation provided by Beijing FANUC.
For More Fanuc CNC repair Cases and technical articles, please back to Fanuc Technical Support Center.
Related Articles
Here are some related technical resources you may also find helpful:
- Common FANUC CNC Alarms Classification
- FANUC Common Over Travel Alarm List
- FANUC G/ M Code for a Machining Center
- FANUC G/ M Code for lathe
- How to backup SRAM file
- How to backup All data
- How to Solve FANUC alarm 5523/5524
Technical Categories
Browse our full set of technical resources:
- Common FANUC Alarms
- G & M Code Reference
- Technical Guides (Backup, Parameters, Settings)
- Repair Cases & Troubleshooting Examples
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