<1> The count value of a position coder signal pulses is abnormal.
<2> The pulse count value of the MZ sensor or BZ sensor is abnormal.
Phases A and B for the position coder have a feedback pulse count of 4096 p/rev per spindle rotation. The SPM checks the pulse counts of phases A and B equivalent to the position coder each time a one-rotation signal is generated. The alarm is issued when a pulse count beyond the specified range is detected.
If this alarm is issued when the cable is moved (as in the case where the spindle moves)
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.
Troubleshooting in other cases
The setting of a parameter is incorrect.
Referring to “FANUC AC SPINDLE MOTOR α series Parameter Manual (B-65160E),” check the parameter for sensor setting.
A sensor (MZ sensor or BZ sensor) is not adjusted correctly.
Adjust the sensor according to Subsection 4.3.4 of Part I of this manual.
The shielding of the cable between the sensor and SPM is faulty.
Referring to Chapter 9, “Connection,” in “FANUC SERVO AMPLIFIER α series Descriptions (B-65162E),” check the shielding of the cable.
The signal cable is bundled with the servo motor power line. If the cable between the sensor and SPM is bundled with the servo motor power line, separate them from each other.
The SPM is faulty.
Replace the SPM or SPM control printed circuit board.
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