
3.TROUBLESHOOTING AND ACTION TROUBLESHOOTING B-65285EN/03
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3.4.13 Alarm Code 27
The signal of the α position coder is disconnected.
(1) If this alarm is issued when the motor is deactivated
(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 cable is disconnected.
If the connection of the feedback cable is correct, replace the
cable.
(c) The SPM is faulty.
Replace the SPM or SPM control printed circuit board.
(2) If this alarm is issued when the cable is moved
(a) 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 when the motor rotates
(a) The shielding of the cable between the sensor and the SPM is
faulty.
Referring to, "Connection," in "FANUC SERVO
AMPLIFIER αi series Descriptions (B-65282EN)," check
the shielding of the cable.
(b) The signal cable is bundled with the servo motor power lead.
If the cable between the sensor and the SPM is bundled with
the servo motor power lead, separate them from each other.
S
P
M
Sensor
Connected to the frame
ground via a cable clamp.
Shielded cable
α
position coder