FANUC CNC systems such as 0i Model D and 0i Mate-Model D are widely used in CNC machining centers and CNC lathes. During machine operation, the servo system may generate SV alarms (Servo Alarms) when abnormal conditions occur.
These alarms can be caused by various factors such as:
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servo amplifier faults
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encoder communication errors
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parameter configuration issues
-
power supply abnormalities
-
FSSB communication failures
-
mechanical load problems
Understanding the meaning of these servo alarm codes can help technicians quickly diagnose machine problems and reduce downtime.
This article provides a complete FANUC servo alarm list for the 0i-D series, including alarm codes SV0001 to SV5197, along with descriptions of each alarm.
FANUC Servo Alarm (SV Alarm) List
Synchronization Control Alarms
| Alarm Code | Alarm Message | Description |
|---|---|---|
| SV0001 | Synchronization Adjustment Error | During feed axis synchronous control, the compensation value during synchronization adjustment exceeds parameter No.8325. This alarm occurs on the master axis or slave axis. |
| SV0002 | Synchronization Error Too Large | During feed axis synchronization control, the synchronization error exceeds parameter No.8332. After power-on and before synchronization adjustment completes, the judgment is based on parameter No.8332 multiplied by parameter No.8330. This alarm occurs only on the slave axis. |
| SV0003 | Synchronous / Hybrid / Overlap Control Interrupted | A servo alarm occurred on one axis during synchronous or hybrid control, preventing the control mode from continuing. All related axes are turned servo off. |
| SV0004 | G31 Error Too Large | Position deviation during torque limit skip command operation exceeds the limit set by parameter No.6287. |
| SV0005 | Synchronization Error Too Large (Mechanical Coordinates) | During feed axis synchronization, the mechanical coordinate difference between master and slave axes exceeds parameter No.8314. |
| SV0006 | Incorrect Dual Motor Drive Axis | Absolute position detection is set for the slave axis in tandem control (parameter APC No.1815#5 = 1). |
| SV0007 | Servo Warning in Another System | In a 2-path system using a multi-axis amplifier across paths, a servo alarm occurred in another path axis. |
Servo Amplifier Hardware Alarms
| Alarm Code | Alarm Message | Description |
|---|---|---|
| SV0010 | SV Overheat | Internal temperature of the servo amplifier is too high. |
| SV0011 | SV Motor Over Current (Soft) | Abnormal command value detected by digital servo software. Possible causes include disconnected power cable, phase loss, or short circuit. |
| SV0012 | SV Drive Off Circuit Failure | Two breaker input signals are inconsistent or breaker circuit abnormal. |
| SV0013 | SV CPU Bus Error | Abnormal data occurred in the CPU bus inside the amplifier. |
| SV0014 | SV CPU Monitor Error | Abnormal CPU operation inside the amplifier. |
| SV0015 | SV Low Volt Driver | Driver power supply voltage inside the amplifier dropped. |
| SV0016 | SV Current Detect Error | Abnormal motor current detection inside the amplifier. |
| SV0017 | SV Internal Serial Bus Failure | Internal serial bus communication failure in amplifier. |
| SV0018 | SV ROM Data Failure | Internal ROM data error inside amplifier. |
| SV0019 | SV Motor Over Current (Ground Fault) | Ground fault in motor, power cable, or amplifier. |
Power Supply Related Alarms
| Alarm Code | Alarm Message | Description |
|---|---|---|
| SV0020 | PS Ground Fault | Ground fault detected in motor, power cable, or amplifier. |
| SV0021 | PS Overcurrent 2 | Overcurrent detected in input circuit. |
| SV0022 | PS Overcurrent 3 | Overcurrent detected in input circuit. |
| SV0023 | PS Overcurrent 4 | Overcurrent detected in input circuit. |
| SV0024 | PS Soft Thermal | Load exceeded rated value. |
| SV0025 | PS DC Link Overvoltage 2 | DC link voltage too high. |
| SV0026 | PS DC Link Overvoltage 3 | DC link voltage too high. |
| SV0027 | PS DC Link Overvoltage 4 | DC link voltage too high. |
| SV0028 | PS DC Link Low Voltage 2 | DC link voltage dropped. |
| SV0029 | PS DC Link Low Voltage 3 | DC link voltage dropped. |
| SV0030 | PS DC Link Low Voltage 4 | DC link voltage dropped. |
| SV0031 | PS Illegal Parameter | Invalid parameter set in power supply control parameters. |
| SV0034 | PS Hardware Error | Hardware failure in power supply module. |
PS Sub Module Alarms
| Alarm Code | Description |
|---|---|
| SV0040 | PS sub-module / power supply / cable failure. Replacement required. |
| SV0041 | PS sub-module / power supply / cable failure. |
| SV0042 | PS sub-module / power supply / cable failure. |
| SV0043 | PS sub-module / power supply / cable failure. |
Absolute Encoder (APC) Alarms
| Alarm Code | Description |
|---|---|
| SV0301 | APC alarm: communication error – machine position cannot be correctly obtained. |
| SV0302 | APC alarm: timeout error – encoder communication timeout. |
| SV0303 | APC alarm: data format error – frame error occurred. |
| SV0304 | APC alarm: parity error detected. |
| SV0305 | APC alarm: pulse error detected. |
| SV0306 | APC alarm: overflow error – position deviation overflow. |
| SV0307 | APC alarm: excessive axis movement during power-on. |
Built-in Encoder Alarms
| Alarm Code | Description |
|---|---|
| SV0360 | Built-in pulse encoder checksum error. |
| SV0361 | Encoder phase abnormal. |
| SV0362 | Revolution data abnormal. |
| SV0363 | Encoder clock error. |
| SV0364 | Software phase alarm. |
| SV0365 | Encoder LED abnormal. |
| SV0366 | Pulse loss detected. |
| SV0367 | Count value lost. |
| SV0368 | Serial communication data cannot be received. |
| SV0369 | CRC error or stop bit error during communication. |
External Detector Alarms
| Alarm Code | Description |
|---|---|
| SV0380 | External detector LED error. |
| SV0381 | Encoder phase abnormal (external scale). |
| SV0382 | Count value lost (external). |
| SV0383 | Pulse loss (external). |
| SV0384 | Software phase alarm (external). |
| SV0385 | Serial data error from external detector. |
| SV0386 | CRC or stop bit error during communication. |
| SV0387 | External encoder abnormal – contact scale manufacturer. |
Servo System Operation Alarms
| Alarm Code | Description |
|---|---|
| SV0401 | Servo V-READY signal OFF. |
| SV0403 | Hardware / software mismatch. |
| SV0404 | Servo V-READY signal ON abnormal. |
| SV0407 | Synchronization position deviation too large. |
| SV0409 | Abnormal torque detected in servo motor. |
| SV0410 | Position deviation too large when stopped. |
| SV0411 | Position deviation too large during movement. |
| SV0413 | Axis LSI overflow. |
| SV0415 | Excessive movement speed specified. |
| SV0417 | Illegal digital servo parameter. |
Servo Motor and Amplifier Protection Alarms
| Alarm Code | Description |
|---|---|
| SV0430 | Servo motor overheat. |
| SV0431 | Inverter circuit overload. |
| SV0432 | Inverter control voltage low. |
| SV0433 | DC link voltage low. |
| SV0434 | Inverter control voltage low (amplifier). |
| SV0435 | DC link voltage low (amplifier). |
| SV0436 | Soft thermal protection detected. |
| SV0437 | Inverter input circuit overcurrent. |
| SV0438 | Inverter current abnormal. |
| SV0439 | DC link overvoltage. |
| SV0440 | Excessive regenerative discharge power. |
| SV0441 | Abnormal current offset detected. |
| SV0442 | DC link charging abnormal. |
| SV0443 | Cooling fan failure (power supply). |
| SV0444 | Cooling fan failure (servo amplifier). |
Encoder Disconnection Alarms
| Alarm Code | Description |
|---|---|
| SV0445 | Software detected encoder disconnection. |
| SV0446 | Hardware detected internal encoder disconnection. |
| SV0447 | Hardware detected external detector disconnection. |
| SV0448 | Feedback inconsistency between internal encoder and external detector. |
| SV0453 | Serial encoder disconnection alarm. |
FSSB Communication Alarms
| Alarm Code | Description |
|---|---|
| SV0460 | FSSB disconnection detected. |
| SV0462 | CNC data transfer error due to FSSB communication error. |
| SV0463 | Servo software failed to receive correct data. |
| SV0465 | Failed to read amplifier ID data. |
| SV0466 | Motor and amplifier combination incorrect. |
| SV0468 | High-speed HRV configuration error. |
Additional System Alarms
| Alarm Code | Description |
|---|---|
| SV0600 | DC link overcurrent. |
| SV0601 | Inverter cooling fan failure. |
| SV0602 | Amplifier overheating. |
| SV0603 | IPM overheating alarm. |
| SV0604 | Amplifier communication error. |
| SV0605 | Excessive regenerative discharge power. |
| SV0606 | Cooling fan stopped. |
| SV0607 | Power phase loss. |
| SV0646 | External analog signal abnormal. |
| SV0654 | Dynamic braking relay failure. |
Initialization and Configuration Alarms
| Alarm Code | Description |
|---|---|
| SV1025 | V-READY signal abnormal during initialization. |
| SV1026 | Illegal axis assignment parameter. |
| SV1055 | Dual motor drive axis configuration incorrect. |
| SV1056 | Tandem drive axis pair configuration incorrect. |
| SV1067 | FSSB configuration error (software detection). |
FSSB System Errors
| Alarm Code | Description |
|---|---|
| SV5134 | FSSB startup timeout. |
| SV5136 | Insufficient number of amplifiers detected by FSSB. |
| SV5137 | FSSB configuration error. |
| SV5139 | FSSB initialization error. |
| SV5197 | FSSB did not open during startup. |
FANUC CNC Repair and Spare Parts Support
If your machine continues to display servo alarms, the problem may be related to the servo amplifier, encoder, power supply module, or FSSB communication system.
REACO CNC provides professional services including:
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FANUC CNC spare parts supply
-
FANUC servo amplifier replacement
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FANUC encoder and cable supply
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FANUC CNC repair services
With 33 years of experience, we support customers worldwide with reliable CNC parts and technical assistance.
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
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Common FANUC Alarms
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G & M Code Reference
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Technical Guides (Backup, Parameters, Settings)
- Repair Cases & Troubleshooting Examples
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