
3.TROUBLESHOOTING AND ACTION TROUBLESHOOTING FOR βi SVPM B-65325EN/01
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3.4.19 Alarm Code 41
The position where the one-rotation signal of the α position coder is
generated is incorrect.
Troubleshooting when this alarm is issued
(a) The setting of a parameter is incorrect.
Referring to "FANUC AC SPINDLE MOTOR αi/βi series
Parameter Manual (B-65280EN)," check the parameter for sensor
setting.
(b) The α position coder is faulty.
Observe the Z signal of the position coder. If the signal is not
generated per rotation, replace the position coder.
(c) The shielding of the cable between the sensor and SVPM is faulty.
Check the shielding of the cable.
(d) The signal cable is bundled with the servo motor or spindle motor
power lead.
If the cable between the sensor and SVPM is bundled with the
servo motor or spindle motor power lead, separate them from each
other.
(e) The SVPM is faulty.
Replace the SVPM or SVPM control printed circuit board.
3.4.20 Alarm Code 42
The one-rotation signal of the α position coder is not generated.
Troubleshooting when this alarm is issued
(a) The setting of a parameter is incorrect.
Referring to "FANUC AC SPINDLE MOTOR αi/βi series
Parameter Manual (B-65280EN)," check the parameter for sensor
setting.
(b) The α position coder is faulty.
Check the check pin PSD on the spindle check board. If the signal
is not generated per rotation, replace the connection cable and
position coder.
(c) The SVPM is faulty.
Replace the SVPM or SVPM control printed circuit board.
3.4.21 Alarm Code 46
The one-rotation signal of the position coder cannot be detected
normally during thread cutting.
Troubleshoot as in the case of alarm code 41.
S
V
P
M
Sensor
Connected to the frame
ground via a cable clamp.
Shielded cable
α
position coder