Fanuc Spindle Amplifier Alarm 27

Fanuc 6055 digital spindle amplifiers
Fanuc 6063, 6064 serial spindle amps
Fanuc 6072, 6078, 6082, 6088, 6102 amps
Fanuc 6111, 6112, 6116, 6141, 6142 amps

The sensor signal (position coder signal) for position control is abnormal.

1. If this alarm is issued when the motor is deactivated
   1. The setting of a parameter is incorrect
   2. The cable connected to JY4 is disconnected
   3. The sensor is not adjusted correctly. Adjust the sensor signal according to the manual. If the sensor signal cannot be adjusted correctly, or the sensor signal is not observed, replace the connection cable and sensor.
   4. The SPM is faulty. Replace the SPM or SPM control printed circuit board.
2. If this alarm is issued when the cable is moved (as in the case where the spindle moves)
   1. The connector has a bad contact, or the cable is disconnected. The conductor may be broken. Replace the cable. If coolant has penetrated into the connector, clean the connector.
3. If this alarm is issued wen the motor rotates
   1. The shielding of the cable between the sensor and the SPM is faulty.
   2. The signal cable is bundled with the servo motor power line. If the cable between the sensor and the SPM is bundled with the servo motor power line, separate them from each other.