What to do if the machining center stops suddenly

Machining center MC-1050PB, CNC system MITSUBISHIMELDAS 520AM, in automatic operation plus, suddenly stopped action, and entered an emergency stop state. At the same time the screen displays an alarm: S01 SERVO ALARM: PR 2F X.

According to the manual, the axis detector is abnormal, that is, the encoder communication error.

According to the analysis of the alarm content, there may be a problem with the communication between the x-axis servo motor pulse encoder and the axis servo module. . Therefore, check whether the connector of the connecting cable between the servo module and the encoder is abnormal. Turn off the power, unplug the plug, and then reconnect it. Turn on, the fault remains the same. According to the principle of judging the failure first and then the difficulty, in order to completely eliminate the possibility of the cable, after turning off the power, unplug the cable again and pull the wire out of the tank chain. Root is broken, connect the broken wire, deal with the damaged place, turn on the power of the machine tool after confirming that there is no problem, and the fault is eliminated.

Because the machine tool is water-processed, the cable hardens after being wet for a long time. During the movement of the tank chain, frequent bending and friction cause damage, and the damage is just at the bend of the tank chain.