B-65285EN/03 TROUBLESHOOTING 3.TROUBLESHOOTING AND ACTION
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αCi SERIES SPINDLE AMPLIFIER MODULE
This section explains those alarm codes for the αCi series which
require troubleshooting sequences that are different from those for the
αi series even when the alarm numbers are the same.
For explanations about the alarm codes not stated herein, see the
descriptions about the corresponding number given in Section 2.4,
"Spindle Amplifier Module."
3.5.1 Alarm Code 12
An excessive motor current was detected.
An excessively large current flowed into the DC link of the main
For SPMC-2.2i to 15i
An overload, overcurrent, or a low control power supply voltage was
detected in the power module (IPM) of the main circuit.
(1) If this alarm is issued on SPM-2.2i to SPM-15i
Check alarm code 09 as well.
(2) If this alarm is issued immediately after a spindle rotation
command is specified
(a) The motor power lead is faulty.
Check for a short circuit between motor power leads and
short-circuit to ground, and replace the power lead as
(b) The insulation of the motor winding is defective.
If the motor is short-circuited to ground, replace the motor.
(c) The parameters specific to the motor are not set correctly.
Refer to "FANUC AC SPINDLE MOTOR
Parameter Manual (B-65280EN)."
(d) The SPMC is faulty.
A power element (IGBT, IPM) may be destroyed. Replace
(3) If this alarm is issued during spindle rotation
(a) Belt slippage
It is likely that there may be belt slippage between the
spindle and motor. Clean the pulleys and adjust the belt
(b) The parameters specific to the motor are not set correctly.
Referring to "FANUC AC SPINDLE MOTOR
Parameter Manual (B-65280EN)," check the parameters
specific to the motor.