If the SPM shows a DC link over-current (AL-12) or other failures, it might be causing the switch failure. Summary Table of Potential Issues Common Issue Low/Failing 24VDC Measure under load, replace PSU. Contactors Burnt/Stuck relay Replace contactor/relay. Feedback Switch Misaligned/Dirty sensor Clean and adjust sensor. Wiring Broken wire/Loose terminal Continuity check. Spindle Amp Faulty SPM Test/Replace amplifier. Conclusion
Troubleshooting the FANUC 7115 Alarm: SPN 1 Spindle Switch Control Error
Periodically check the liquid-tight seals on motor terminal boxes to ensure coolant cannot seep inside. fanuc 7115 alarm
FANUC 32i with a robot loading cells. Symptom: 7115 alarm triggered exactly on line N345 of the main program: CALL O9010 . Diagnosis: Subprogram O9010 contained a DPRNT command trying to send a string to a non-existent serial port. The PMC interface address was out of range. Solution: Edited O9010 to remove the DPRNT command and used a POPEN reset first. Restarted the control.
Last month, a customer called with a 7115 alarm on their lathe. The line read G70 P100 Q200 . The P and Q were fine. But I noticed the line before: G72.2 . Their control had but not type III. Simply changing G72.2 to G72.1 (or removing the .2 ) solved the entire problem. If the SPM shows a DC link over-current
This is the leading cause after a system backup restore, control board replacement, or a recent machine retrofitting.
The article should address this. I will structure the article to explain that 7115 is likely a user-defined alarm, provide general guidance on how to investigate user-defined alarms, and include steps for accessing PMC ladder logic. I will also cover common causes and solutions for related alarms. Conclusion Troubleshooting the FANUC 7115 Alarm: SPN 1
| Alarm | Relationship | | :--- | :--- | | | Over travel alarm | | 7106 | Reference point return deceleration signal error | | 7107 | Reference point return dog signal not detected | | 7110 | Reference point return speed error |
To help troubleshoot your specific issue, could you tell me:
The control is not receiving the expected confirmation signal from the spindle unit or switching sensor. Troubleshooting Steps Check 24VDC Power: