This page covers FANUC SP alarms related to rigid tapping, spindle mode switching, spindle positioning, spindle deviation, spindle load detection, position coder conditions, spindle gear ratio settings, and communication data abnormalities. These alarms are especially relevant in applications where spindle positioning accuracy, spindle synchronization, and rigid tapping performance directly affect machining quality.
These alarm references apply to FANUC Series 0i-Model D and FANUC Series 0i Mate-Model D.
In practical maintenance work, this group of SP alarms is commonly associated with spindle positioning errors, excessive spindle deviation, incorrect spindle selection, encoder-related conditions, or communication issues between the CNC and spindle control system. At REACO CNC, we supply FANUC CNC parts, FANUC robot parts, Mitsubishi automation parts, and repair services for customers worldwide.
What These FANUC SP Alarms Usually Indicate
This section of the FANUC alarm list mainly relates to spindle control accuracy and spindle operating mode conditions. In practical terms, these alarms may appear when rigid tapping control cannot maintain the required synchronization, when spindle positioning deviation becomes too large, when spindle mode switching does not complete correctly, or when the CNC detects abnormal spindle-side communication or feedback data.
Some of these alarms are generated during actual spindle movement, while others appear during initialization, mode switching, spindle selection, or communication between the CNC and the spindle system. Because spindle control is closely tied to cutting accuracy, tapping quality, and machine reliability, these alarms should be reviewed carefully before restarting production.
Common Causes of FANUC Rigid Tapping and Spindle Position Alarms
Typical causes include excessive spindle position deviation during motion or stop, synchronization error during rigid tapping, incorrect spindle mode switching, abnormal spindle load, spindle encoder problems, gear ratio setting errors between the spindle and position coder, spindle motor assignment mismatch, and communication data errors between the CNC and spindle control side.
In field maintenance, these alarms may also appear after spindle parameter changes, spindle amplifier work, encoder-related issues, incorrect spindle number selection, or problems in spindle position feedback. On some machines, repeated spindle deviation alarms may point to a broader mechanical, electrical, or feedback-related issue rather than a single isolated fault.
Full FANUC SP Alarm List: Rigid Tapping, Spindle Position and Deviation Alarms
Table 1. Rigid Tapping and Spindle Mode Alarms
| Alarm Code | Alarm Message | Full Technical Content |
|---|---|---|
| SP0740 | Rigid tapping alarm: excessive error | During rigid tapping, the spindle position deviation while the spindle is stopped exceeded the set value. |
| SP0741 | Rigid tapping alarm: excessive error | During rigid tapping, the spindle position deviation while the spindle is moving exceeded the set value. Alternatively, the synchronization error exceeded the set value. |
| SP0742 | Rigid tapping alarm: LSI overflow | During rigid tapping, LSI overflow occurred on the spindle side. |
| SP0752 | Spindle mode switching error | In serial spindle control, switching to Cs contour control mode, spindle positioning mode (T series), or rigid tapping mode, and switching back to spindle control mode, did not complete normally. This alarm is issued when the spindle amplifier cannot respond correctly to the NC mode change command. |
| SP0754 | Abnormal load detected | The spindle motor detected an abnormal load. This alarm can be cleared by RESET. |
Table 2. Spindle Selection, Connection and Parameter Relationship Alarms
| Alarm Code | Alarm Message | Full Technical Content |
|---|---|---|
| SP1202 | Spindle selection error | A spindle number other than a valid spindle number was selected by the position coder selection signal in multi-spindle control. Alternatively, the spindle number of a path with no valid spindle was selected. |
| SP1220 | No spindle amplifier connected | The cable to the serial spindle amplifier is disconnected, or the serial spindle amplifier is not connected properly. |
| SP1221 | Illegal spindle motor number | The correspondence between spindle number and motor number is incorrect. |
| SP1224 | Spindle-position coder gear ratio error | The gear ratio setting between the spindle and the position coder is incorrect. |
Table 3. Serial Spindle Communication and Data Alarms
| Alarm Code | Alarm Message | Full Technical Content |
|---|---|---|
| SP1225 | CRC error (serial spindle) | A CRC error (communication error) occurred in communication between the CNC and the serial spindle amplifier. |
| SP1226 | Format error (serial spindle) | A format error occurred in communication between the CNC and the serial spindle amplifier. |
| SP1227 | Receive error (serial spindle) | A receive error occurred in communication between the CNC and the serial spindle amplifier. |
| SP1228 | Communication error (serial spindle) | A communication error occurred between the CNC and the serial spindle amplifier. |
| SP1229 | Serial spindle amplifier communication error | A communication error occurred between serial spindle amplifiers (between motor numbers 1 and 2, or between motor numbers 3 and 4). |
| SP1245 | Communication data error | A communication data error was detected on the CNC side. |
| SP1246 | Communication data error | A communication data error was detected on the CNC side. |
| SP1247 | Communication data error | A communication data error was detected on the CNC side. |
Table 4. Spindle Deviation, Encoder and Position Feedback Alarms
| Alarm Code | Alarm Message | Full Technical Content |
|---|---|---|
| SP1231 | Spindle excessive error (during motion) | The spindle position deviation during spindle rotation is larger than the value set by parameter. |
| SP1232 | Spindle excessive error (at stop) | The spindle position deviation while the spindle is stopped is larger than the value set by parameter. |
| SP1233 | Position coder overflow | The error counter or speed command value of the position coder overflowed. |
| SP1234 | Grid shift amount overflow | Grid shift overflow occurred. |
| SP1240 | Position coder disconnection | The position coder of the analog spindle is disconnected. |
| SP1241 | D/A converter abnormality | Abnormality occurred in the D/A converter for analog spindle control. |
| SP1243 | Spindle parameter setting error (gain) | The spindle position gain setting is incorrect. |
| SP1244 | Excessive travel amount | The spindle allocation amount is too large. |
Practical Inspection Notes
When SP alarms appear, the first practical step is usually to determine whether the problem is related to spindle synchronization, spindle position feedback, spindle mode switching, or serial spindle communication. For rigid tapping alarms, it is especially important to review spindle synchronization behavior, tapping load condition, and whether spindle deviation increased during motion or stop.
For spindle deviation and position coder alarms, typical checks include spindle encoder condition, signal integrity, spindle mechanical load, spindle gain-related settings, and whether the spindle can hold accurate positional control. For communication-related alarms, the connection between the CNC and the serial spindle amplifier should be reviewed carefully, including cable condition, amplifier response, and spindle-side communication stability. If a spindle mode switching alarm appears repeatedly, both the spindle amplifier behavior and the CNC command transition path should be checked.
REACO CNC Support
REACO CNC supplies FANUC CNC parts, FANUC robot parts, Mitsubishi automation parts, and repair services for customers worldwide. If your machine is showing FANUC spindle alarms related to rigid tapping, spindle position control, spindle encoder feedback, or serial spindle communication, we can support your spare parts sourcing and industrial repair requirements.
With 34 years of industry experience, REACO CNC supports global customers with worldwide shipping, tested industrial parts, and practical repair solutions for FANUC and Mitsubishi systems.
FAQ
What does a FANUC SP rigid tapping alarm usually mean?
It usually means the spindle position deviation or synchronization error exceeded the allowed value during rigid tapping operation.
What does spindle mode switching error mean?
It means switching between spindle control modes, such as spindle control, Cs contour control, spindle positioning, or rigid tapping mode, did not complete normally.
What causes spindle communication alarms on FANUC systems?
Typical causes include cable disconnection, unstable communication between the CNC and serial spindle amplifier, amplifier-side communication problems, or data transmission errors.
What does SP1231 or SP1232 indicate?
These alarms indicate that spindle position deviation became larger than the allowed parameter value during motion or at stop.
Which machines does this reference apply to?
These alarm references apply to FANUC Series 0i-Model D and FANUC Series 0i Mate-Model D.
Reference Source: Beijing FANUC. This article is based on technical documentation provided by Beijing FANUC.
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