Code SP0031: Motor lock alarm

Amplifier LED display: 31 Also shown as: SP0031 (15i), SP9031 (30i/31i/32i), SP9031 (0i-D) Cause: The motor failed to rotate as specified, and has stopped or is rotating at a very low speed. (1) If the motor rotates at a very low speed and this alarm is issued (a) The setting of a parameter is incorrect. Referring to "FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280EN)," check the parameter for sensor setting. (b) The phase sequence of the motor power lead is incorrect. Check whether the phase sequence of the motor power lead is correct. (c) The feedback cable of the motor has a problem. Check if the phase A/B signals are connected correctly. (d) The feedback cable of the motor is faulty. Rotate the motor manually to see if a speed is indicated in the item of motor speed on the CNC diagnosis screen or on the spindle check board. If no speed indication is provided, replace the cable or spindle sensor (or motor). (2) If the motor does not rotate at all and this alarm is issued (a) The sequence for locking the spindle is incorrect. Check the sequence to see if the spindle is locked. (b) The power lead is faulty. Check if the power lead is connected to the motor correctly. If spindle switching or winding switching is performed, check if the magnetic contactor is on. (c) The Spindle Amplifier is faulty. Replace the Spindle Amplifier.