8-6
8-3 Troubleshooting
8
Troubleshooting
Error Diagnosis Using the Displayed Alarm Codes
Alarm
code
Error
Status when error
occurs
Cause Countermeasure
11 Power supply
undervoltage
Occurs when the power
supply is turned ON or
during operation.
• The power supply volt-
age is low.
• Momentary power inter-
ruption occurred.
• Power supply capacity is
insufficient.
• The power supply volt-
age drops because the
main power supply is
OFF.
• The main power supply
is not input.
• Increase the power sup-
ply capacity.
• Change the power sup-
ply.
• Turn ON the power sup-
ply.
• Power supply capacity is
insufficient.
• Increase the power sup-
ply capacity.
• Phase loss. • Connect the phases (L1,
L2, L3) of the power sup-
ply voltage correctly.
• For single-phase, con-
nect to L1 and L3 correct-
ly.
• The main circuit power
supply part is damaged.
• Control PCB error.
• Replace the Servo Drive.
12 Overvoltage Occurs when power
supply is turned ON.
• Main circuit power supply
voltage is outside the al-
lowable range.
• Change the main circuit
power supply voltage to
within the allowable
range.
Occurs when the Ser-
vomotor is decelerat-
ing.
• Load inertia is too large. • Calculate the regenera-
tive energy, and connect
an External Regenera-
tion Resistor with the re-
quired regeneration
absorption capacity.
• Extend the deceleration
time.
• Main circuit power supply
voltage is outside the al-
lowable range.
• Change main circuit
power supply voltage to
within the allowable
range.
Occurs during descent
(vertical axis).
• Gravitational torque is
too large.
• Add a counterbalance to
the machine to lower
gravitational torque.
• Slow the descent speed.
• Calculate the regenera-
tive energy, and connect
an External Regenera-
tion Resistor with the re-
quired regeneration
absorption capacity.
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