Code SP0084: Spindle sensor disconnected

Amplifier LED display: 84 Also shown as: SP0084 (15i), SP9084 (30i/31i/32i), SP9084 (0i-D) Cause: The actual motor speed exceeded the overspeed level corresponding to the velocity command. When this alarm is issued at the start, possible causes are all of (a) to (c) below. When the machine has been operating normally, it is highly possible that the cause is noise in (c). Troubleshooting when this alarm is issued (a) There is a setting error in a parameter (number of teeth of the motor sensor or number of phases of the motor). Refer to the FANUC AC SPINDLE MOTOR αi series Parameter Manual (B-65280EN) to check the relevant parameters. (b) When a BiS Series spindle motor (synchronous spindle motor) is driven, there is a setting error in an AMR offset-related parameter (No. 4084 or 4085). Parameter No. 4084 (AMR offset) is adjusted for each machine. Readjust this parameter when the phase relationship between the magnetic pole 0-deg position of the rotor and the one-rotation signal position of the sensor changes due to the replacement of the sensor or slippage of the shaft or when the parameter is loaded from another machine. Parameter No. 4085 is provided for AMR offset adjustment. Normally, this parameter must be set to "0". (d) A count error occurs in the motor sensor due to noise. Apply appropriate countermeasures against noise.