
3. TROUBLESHOOTING
B-65165E/02 TROUBLESHOOTING AND ACTION
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3.4.3 αC Series Spindle Amplifier Module
For the αC series, only those alarm codes that have the same number as
for the α series and require troubleshooting different from the α series
are described.
For an alarm code not covered by this subsection, see the description of
the alarm code for the α series spindle amplifier module.
3.4.3.1 Alarm code 12
An excessively high motor current was detected.
An excessively high current flowed into the DC link of the main circuit.
For SPMC-2.2 to SPMC-11
The power module (IPM) of the main circuit detected an excessive load,
excessively high current, or decrease in control supply voltage.
(1) If an SPMC from SPMC-2.2 to SPMC-11 indicates this alarm
Check alarm code 09 as well.
(2) If this alarm is issued immediately after a spindle move command
is specified
(a) The motor power line is faulty.
Check for a short circuit between motor power lines and
short-circuit to ground, and replace the power line as
required.
(b) The motor winding has an insulation failure.
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 α series
Parameter Manual (B-65160E)."
(d) The SPMC is faulty.
A power element (IGBT, IPM) may be destroyed. Replace
the SPMC.
(3) If this alarm is issued during spindle rotation
(a) Belt slippage
The belt between the spindle and motor may be slipping.
Clean the pulley and run the belt again.
(b) The parameters specific to the motor are not set correctly.
Referring to "FANUC AC SPINDLE MOTOR α series
Parameter Manual (B-65160E)," check the parameters
specific to the motor.