When Fanuc simulates the spindle output, there is often an SP1241 alarm. The official instruction manual states: The D/A converter used to simulate the spindle is abnormal. The analog spindle interface is on the FANUC system motherboard. The OID system is as shown below:
Interface JA40 is an analog spindle output and high-speed jump output interface.
The SVC signal in the figure is an analog voltage output signal (0-10V), and the dotted line SHIELD is the shielding line to prevent interference.
Fault case one:
Fault phenomenon: SP1241 alarm often occurs during system debugging;
Treatment method: Observe the electrical cabinet and find that the SP1241 alarm is prone to occur when the solenoid valve is closed, and the three-phase power supply does not have an arc extinguisher. It is suspected that it produces electromagnetic interference during work, causing the system to mistakenly believe that the analog voltage is abnormal and generate the SP1241 alarm. Disconnect it (AC contactor) and let the system run. After the machine tool worked for half a day, the SP1241 alarm did not appear. Add a three-phase arc extinguisher to the AC contactor and the system worked. After working for half a day, the SP1241 alarm did not appear.
Question keywords: arc extinguishing, interference;
Note: The user has not responded to this alarm appearing again;
Principle analysis: The working principle of the arc extinguisher is to make it change smoothly when encountering a large current, thereby avoiding interference and protecting electronic components;
